Tendzone TYCHO T 1212/CA - Manual (Page 34)

level is more than the preset threshold, the output level is compressed by the ratio set. Signal Output = Threshold + (Signal
Input - Threshold) / Ratio; if the input level is less than preset threshold, the signal will be directly output. Signal Output =
Signal Input; when the ratio is adjusted by “+∞”, the compressor becomes as a limiter.
- Bypass: the input signal is bypassed and will not be processed. If it is pressed, the compressor will be disabled.
Otherwise, the compressor will be enabled.
- Threshold: is the initial level of compression. When the signal is more than this limit value, the compression processing
module will be enabled to compress the signal; when the signal is less than this limit value, the compression processing
module will be disabled and the signal input will be fed directly to the output.
- Ratio: the compression ratio of signal over threshold.
- Release time: the time from the level input is less than preset value to that the compressor fully stops operating.
- Attack time: the time from the level input reaches the threshold to that the compressor starts.
- Output: the actually compressed level value.
2.2.5AGC
Figure 30
First, the function of AGC is described. For example, when the user speaks facing towards the microphone, the distance
between the mouth and the microphone will fluctuate, causing fluctuating volume output. Though setting the threshold,
AGC outputs the signal input by 1:1 if the level less than threshold while the level over the threshold will be directly raised
by ratio. The target level is properly set so that the sound signal may be output stably.
AGC control is to automatically control range of gain through changing I/O compression ratio. When the weak signal is