closes to the microphone, the sound will be louder than the normal distance of speech, especially
when it is very close, and the auto gain will attenuate the sound signal to a certain extent. In this
way, the auto gain can achieve a certain dynamic range of the sound.
4.2.2 Parameter information
On and Off: Turn on and off this function.
Soft Knee: Soft Knee allows the compression ratio to slowly increase as the input signal level
increases, so that the process of sound from not being compressed to being compressed is not too
noticeable. The larger the value, the larger the influence range of the inflection point.
Start Level: Desired output signal level. If the signal is above this threshold, the controller will
compress the signal proportionally. Gain compensation is performed if it is below this threshold and
within the maximum gain range. For example, set the start level to -15db. If the microphone level is
-10db at this time, it will be compressed according to the compression ratio. If the microphone level
is -17db and the maximum gain is 6db, then the gain compensation will be 2db.
Compression Ratio: The ratio between the change of the input signal level above the threshold and
the change of the output signal level.
Start Time: The response time of raising the input signal level to the start level, that is, when the
input level is less than the start level, the signal needs to be boosted at this time, and this
parameter is to control the speed of boosting.
Release Time: The response time of compressing the input signal level to the start level, that is,
when the input level is higher than the start level, the signal needs to be compressed at this time.
This parameter is to control the speed of compression.
Max Gain: When the signal level is lower than the target level, a certain gain needs to be applied to
the signal. This parameter is to control the maximum gain on level.
4.3 Voice Activation
4.3.1 The voice activation is mainly to check whether someone is speaking using the microphone
according to the voice amplitude, and this function can be extended to camera tracking and voice
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