The future development direction of public broadcasting technology
With the demand of the public broadcasting market, some broadcasting systems different from the conventional broadcasting system have appeared. They evolve in roughly two directions, one in the traditional broadcast system, such as integrating the control system to make its operation more user-friendly; or changing the line topology from a star to a bus. Simplify the wiring structure and more. Another direction of development is to save the troublesome lines of traditional public broadcasting.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
With the demand of the public broadcasting market, some broadcasting systems different from the conventional broadcasting system have appeared. They evolve in roughly two directions, one in the traditional broadcast system, such as integrating the control system to make its operation more user-friendly; or changing the line topology from a star to a bus. Simplify the wiring structure and more. Another direction of development is to save the troublesome lines of traditional public broadcasting.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
With the demand of the public broadcasting market, some broadcasting systems different from the conventional broadcasting system have appeared. They evolve in roughly two directions, one in the traditional broadcast system, such as integrating the control system to make its operation more user-friendly; or changing the line topology from a star to a bus. Simplify the wiring structure and more. Another direction of development is to save the troublesome lines of traditional public broadcasting.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
With the demand of the public broadcasting market, some broadcasting systems different from the conventional broadcasting system have appeared. They evolve in roughly two directions, one in the traditional broadcast system, such as integrating the control system to make its operation more user-friendly; or changing the line topology from a star to a bus. Simplify the wiring structure and more. Another direction of development is to save the troublesome lines of traditional public broadcasting.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
With the demand of the public broadcasting market, some broadcasting systems different from the conventional broadcasting system have appeared. They evolve in roughly two directions, one in the traditional broadcast system, such as integrating the control system to make its operation more user-friendly; or changing the line topology from a star to a bus. Simplify the wiring structure and more. Another direction of development is to save the troublesome lines of traditional public broadcasting.
The following is a brief introduction to several common public broadcast categories.
Intelligent
The so-called intelligent refers to computerization, in fact, it is required to put the entire public broadcasting system under computer management.
In recent years, many aspects of the conventional public address system have been incorporated into computer management, mainly using microcontroller management. But until the end of the last century, the products that placed the whole broadcast system under computer management basically did not appear. Since 2000, various computer-managed public address systems have been introduced to the market. Most intelligent public address systems place the system under the control of a general-purpose PC and are controlled by a common keyboard. The rest of the system is still conventional, with the addition of a computer interface. The latest intelligent public address system on the market is more professional. Usually, a dedicated host virtualizes all the links except the amplifier (including the audio source playback link), and then directly controls it on the host screen.
Networking
Networking refers to turning a traditional public broadcasting network into a data network. In the traditional public address system, information is transmitted by analog power signals, and control equipment is concentrated in the equipment room. Networked broadcasting addresses at least the following three problems of the traditional public address system:
1) The power transmission line not only requires a large line cross section, but also is inconvenient to realize multi-path transmission (it is not convenient to implement line multiplexing).
2) The analog signal is not convenient for implementing multi-point control, and it is not convenient to realize the interaction between the terminals.
3) Modern intelligent buildings require the establishment of data networks, video networks and audio networks. Public broadcasting is a major component of the audio network. If it is digitized, triple play will be realized.
Wireless transmission
Nowadays, all local radio stations basically use wireless FM radio. The terminal (radio) is purchased by the user voluntarily, and the user selects the radio station according to his own preferences. Wireless FM radio stations have basically replaced the previous rural cable broadcasts. A public broadcast using wireless frequency modulation is similar to the above-described FM radio station. The difference is that the coverage of wireless FM public broadcasting is small, and the broadcasting system, including the broadcasting terminal, is purchased, built and maintained by the engineering party. Wireless FM public broadcasting has quite outstanding advantages: no wiring is required, no pre-planning is required for building design, investment cost is low, construction speed is extremely fast, sound quality is relatively good, and multiple sets of programs can be broadcast, which is easy to maintain and the number of broadcasting terminals is not Restricted, etc. But it has a fatal flaw: poor reliability. The specific performance is as follows: 1. With the changes of terrain, weather, radio waves and other factors, the received signal is unstable, resulting in the sound of the terminal being strong and weak, good or bad, and may receive radio stations that should not be received. 2, the control signal of the wireless FM public broadcasting is one-way, the broadcast terminal often does not listen to the command, such as the wrong start, shutdown; 3, each terminal has a
Set of complex circuits, the reliability is greatly reduced; 4, the confidentiality is almost zero. In addition to the shortcomings of poor reliability, frequency regulation has become a bottleneck restricting the public FM radio broadcasting market. Today's wireless FM public broadcasting almost adopts frequency phase-locked loop, quartz crystal oscillation, acoustic surface filtering, control signal encoding and scanning error correction, etc., so that the stability has been improved, but the reliability problem has not been solved. If you hear that a merchant claims that reliability is absolutely ok, please don't believe it.
Transmission based on cable television network
The advantage of a broadcast system based on cable television transmission is that it is common to transmit dozens of programs simultaneously on a coaxial cable, and an existing cable television cable can be used as a carrier. If the broadcasting area originally exists in the cable television system, it may be considered to establish a public broadcasting by using a cable television network. Since the electromagnetic environment inside the coaxial cable is much better than the air, the reliability is far more reliable than the wireless public address system. However, compared with the traditional public address system, its reliability is worse, because its broadcast terminal is very complicated, and it needs to take power at the terminal site and is constrained by the reliability of the power grid.
Addressable control
Addressable broadcast systems, like intelligent broadcast systems, are based on improved systems for traditional cable broadcasts. The wiring structure of the traditional cable broadcasting is usually star-shaped (radial), and the addressable broadcasting system changes the wiring structure into a bus shape (trunk type), which greatly simplifies the design, construction, management, and the like of the line. The control of a truly addressable broadcast system is interactive, and the broadcast terminal is passive and not subject to grid constraints. If any of the broadcast terminals is not normal, it will be notified immediately in the broadcast room. Therefore, its reliability is very high, which makes maintenance work easy. The broadcasting system of the wireless broadcasting system and the cable television network transmission system is also accessed by data address encoding, but since they are one-way control, the broadcasting terminal does not respond to the broadcasting host, and strictly speaking, they cannot be called an addressable type.
Coin/Button Cell-retainers And Contacts
Antenk coin cell battery retainers Designed for memory back-up and stand-by applications, these contacts permit quick and easy coin cell replacement and installation. Eliminating "soldered-in" cells, computer, video, telecommunication and similar PCB based product users now have a reliable, "no tools required" method for changing batteries.
Extremely economical, these retainer contacts are available in surface mount (SMT) or thru hole mount (THM) styles for 4.8mm, 6.8mm, 11.6mm,12mm, 16mm, 20mm, 23mm and 24mm coin cells. The THM version has stable mounting legs for excellent board retention during wave solder. The SMT version includes a unique solder tail "flow-hole" design to bolster reflow and strengthen solder joints. They are manufactured from phosphor bronze, precision stamped and are plated with either a high luster nickel finish or matte tin finish ideal for low temperature soldering enviornments. Both feature dual spring contacts to assure reliable connections and a low contact resistance.
Antenk Coin/Button Cell-retainers And Contacts
Coin cell retainers are simple metal contacts that both electrically connect coin cells and hold them in place, while taking up minimal additional space on the PCB. They feature nickel-plating, and since most coin cells have nickel shells this helps to prevent galvanic corrosion, an electrochemical process that can damage dissimilar metals that are in electrical contact. Our retainers are always designed with automation in mind, and can be easily picked and placed, with both through hole and surface mount retainers available for most coin cell sizes. Combining the ease of automation with the low cost of Antenk's retainers, it is no wonder they are such a popular product.
Coin Cell, Button Cell, Retainers, Contacts
Designed for memory backup and standby applications, Antenk's compact coin cell battery retainers permit quick and easy coin cell replacement and installation. By eliminating soldered-in cells, computer, video, telecommunication, and similar PCB based product users now have a reliable, no tools required method for changing batteries.
These holders and retainers are available in surface-mount (SMT) or through-hole-mount (THM) styles for 4.8 mm to 24 mm coin cells. The THM version has stable mounting legs for excellent board retention during wave soldering. The SMT version includes a unique solder tail flow-holedesign to bolster reflow and strengthen solder joints. Both feature dual spring contacts to assure reliable connections and low contact resistance.
Coin Cell, Button Cell, Retainers, Contacts Features
Available in THM or SMT configurations
SMT solder tail with flow-hole design for increased joint strength
SMT solder tail located outside of retainer body which facilitates visual inspection of the solder joints
THM legs maintain relative position during and after soldering
Reliable spring tension assures low contact resistance
Retains battery securely to withstand shock and vibration
Ideally suited for high-density packaging
Ideal for low-profile space-saving PCB applications
Designed for reflow and all PCB soldering applications
Compatible with all wave and reflow operations
Compatible with most vacuum and mechanical, pick and place assembly systems
Matte-tin plate for lower soldering temperatures ideal where other temperature sensitive components are being used
Tin-nickel plated retainers are ideal for lead-free, high-temperature soldering applications
Retainers available for coin cell batteries from 4.8 mm to 24 mm diameter
Coin Cell Retainers by Size of Cell
191 | 335 | CR1025 | CR1216 | CR1220 | CR1225 | CR1632 | CR2016 | CR2032 | CR2320 | CR2325 | CR2330 | CR2354 | CR2430 | CR2450 | CR2477 | F3 iButton | F5 iButton | LR1120 | LR44 | ML414 | SR512SW | SR60 | V80H or CP1654 | BR1025 | BR1216 | BR1220 | BR1225 | BR1632 | BR2016 | BR2032 | BR2320 | BR2325 | BR2330 | BR2450 | BR2477 | Other Sizes
Button Contacts,Coin Cell Retainers And Contacts,Coin Cell Retainers
ShenZhen Antenk Electronics Co,Ltd , https://www.atkconnectors.com