How to choose the baseband link of invisible headset
How to select the baseband link of the invisible headset is actually a professional problem discussion. The invisible ear refers to the headset used for watching TV. The deep ear canal anti-shielding wireless recessive headset does not need to select the baseband link, especially Like us, like the radio monitoring vehicle and the metal detector, the eight anti-shielded wireless invisible headset is equipped with 405 ears.
The invisible earphone base has two kinds of physical link modes, synchronous link SCO and asynchronous link ACL, multiple data transmission can be realized on the same radio frequency. The SCO is suitable for voice and voice and data combinations. All voice and data packets are accompanied by different levels of forward error correction (PEC) or cyclic redundancy check (CRC) and can be encrypted. In addition, a special channel is assigned to different data types (including link management information and control information). Various user modes can be used to transfer voice between Bluetooth devices, and link-oriented voice packets need only be transmitted over baseband without LZACP. The voice mode is relatively simple in a Bluetooth system and voice can be transmitted simply by opening an earphone link. However, the transmission rate is relatively low. An SCO channel can provide 64kb/s voice or data service in each direction. Although this rate satisfies normal voice data transmission without problems, it is insufficient to satisfy the delivery of high-quality multimedia audio data. ACL applies to data packets, it supports symmetric or asymmetric, packet switching, point-to-multipoint connection, mainly used to transmit data. For asymmetric connections, the maximum rate in one direction is 723.Zkbi/ts. Based on these characteristics of the ACL link, it is no problem to use it to transmit high-quality audio data. Therefore, the system selects the ACL link as the baseband physical link method.
From the above description, we can see that the JC241B0 recessive headset baseband provides a variety of hardware interfaces for the system. The system uses the UART as a hardware interface. On the software interface, the STLC241B0 supports the standard HCI interface. But the Bluetooth board is programmable, so it can re-customize the software interface it provides, and re-layout the baseband protocol stack. How to choose a suitable communication interface and baseband communication is a crucial issue. At the time of selection, we proposed the following three solutions: directly using the HCI interface for data communication without passing through the upper layer protocol of the baseband, communicating with the baseband module through the standard HCI interface and implementing the Bluetooth upper layer protocol on the host, and the Bluetooth module All baseband underlying protocols and core protocols are implemented, and the host communicates with the invisible headset module through RCFOMM.
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