How to judge the quality of a wireless microphone system
Although operating a wireless microphone system can sometimes be complicated, we can perform some simple tests (without special test equipment) to understand the main performance of the wireless microphone, which is very practical. Wireless microphones are still "microphones" by definition. Its sole design goal is to produce accurate audio signals for a variety of applications. The microphone is "wireless" meaning that it can be applied without a connecting wire. Before you decide to purchase or rent a system, the following tests are recommended to help you assess the quality of your particular wireless microphone system. Each test will check for specific types of performance and problems with the system. In order to get an overall assessment of the quality of the system, it is best to do as many of these tests as possible (but not all), because you will find that some designs perform well in some areas and poorly in another. . Only one or two tests are not enough to get a better overall assessment.
1. "Car key test"
This is a popular test among high-end wireless manufacturers. This simple test reveals how wireless microphones can handle high-band audio transients well and reflect the quality of audio processing links throughout the system. Connect a headset or a set of audio systems that can completely block howling at very high sound pressure levels in a wireless system. It is best to be able to listen to the receiver's audio output with headphones or an audio system while isolating the original sound produced by the keychain. Set the input gain on the transmitter to the normal value according to the average speaking volume. Gently shake the keychain near the microphone to make it clink. Shake the keychain about a foot or so from the microphone, then shake it away from the microphone until you are 8 to 10 feet away from the microphone. Listen to the audio coming out of the receiver. Does it sound like a bunch of potato chips that are shivering or crushed? Then, let someone talk in the wireless system while shaking the key. Watch out for the distortion of the speaker's voice. Take the key a foot or so away from the microphone, then go to 8 to 10 feet away, and watch the changes in the speaker's voice.
This can be a very difficult test item for any other wireless microphone except for a microphone connected by a wired cable. The results you hear will tell you if the start and delay times of the input limiter and compander are excellent in this design, and let you know what audio quality you can get from the wireless system in real life. A loosely oscillating metal key on the key ring produces a lot of high frequency transient sounds. A wireless system that failed this test. Usually in the usual application, the squeaky sound in the human voice will also be distorted. Usually the listener does not notice this high-frequency momentary distortion because the squeak has no specific frequency and is more like random noise. Distorted random noise still sounds like noise, so it's not easy to detect.
However, in this keychain test, in the audio signals outputted by many failed wireless microphones, the original keychain collision sound has no clear sound quality at the receiver end, but instead hears a low sound. It seems that someone's hand is between the mouth and the microphone. The keychain test will remind you to listen carefully to any distortion of the sound. The keychain test also shows the audio circuitry of the wireless microphone that is disturbed by the ultrasound. The peak energy of the key to the crisp sound is actually concentrated at 30khz, above the human hearing range. If the circuit in the transmitter does not filter out the ultrasonic waves, the compander will respond incorrectly. Because the squeaky sound in the human voice also contains ultrasonic waves, this is a practical test. Since the sound you can't hear will cause the intensity to go up and down, the ultrasonic overload will make the squeaky sounds harsh.
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