Yamaha CS1D Owner's Manual - Page 547

Compressor Types Parameter Range THRESHOLD -54 dB to 0 dB (1 dB steps) OUT GAIN -18 dB to ±0.0 dB (0.5 dB steps) WIDTH 1 dB-90 dB (1 dB steps) ATTACK 0-120 ms (1 ms steps) RELEASE 5 ms-42.3 s (fs = 48 kHz) 6 ms-46 s (fs = 44.1 kHz) RATIO 1:1, 1.1:1, 1.3:1, 1.5:1, 1.7:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 5:1, 6:1, 8:1, 10:1, 20:1 (15 points) INPUT FILTER HPF (high-pass filter) or HPF/LPF LPF (low-pass filter) INPUT FILTER ON/OFF ON or OFF INPUT FILTER FREQUENCY 20 Hz-20 kHz (121 steps) THRESHOLD-This determines the input signal level at which compression and expansion are applied. Signals at a level below the sum of the threshold and width are attenuated by the expander. Signals at and above the threshold level are compressed by the amount specified using the Ratio parameter. The trigger signal is sourced using the KEY IN parameter. OUT GAIN-This sets the compander's output signal level. It can be used to compensate for the overall level change caused by the compression and expansion processes. WIDTH-This determines how far below the threshold level expansion is applied. The expander is essentially turned off when the width is set to 90 dB. ATTACK-Specifies the time over which the signal will be compressed (starting when the compressor of the compander is triggered) or the time over which the gain will return to normal after the expander is triggered. If the attack time is fast, the signal will be compressed or return to normal nearly instantaneously. If the attack time is slow, the initial attack portion of the sound will not be compressed or return to normal. Attack times from 1 to 5 milliseconds are a good place to start. RELEASE-Specifies the time from when the level of the trigger signal falls below the threshold until the compressor returns to the normal gain or the expander expands. If the release time is too short, the compressor gain will return suddenly, making the sound jump out (i.e., the gain will change unnaturally). However if the release is too long, the next high-level signal will be input before the compressor gain has returned, and compression may not occur appropriately. Release times from 0.1 to 0.5 seconds are a good place to start. RATIO-This determines the amount of compression. That is, the change in output signal level relative to change in input signal level. For a 2:1 ratio, for example, a 10 dB change in input level (above the threshold) results in a 5 dB change in output level. For a 5:1 ratio, a 10 dB change in input level (above the threshold) results in a 2 dB change in output level. The expander ratios are fixed: 1.5:1 for the soft compander (S) and 5:1 for the hard compander (H). INPUT FILTER HPF/LPF-Select the filter that will be applied to the signal immediately before the expander. When HPF (high pass filter) is on, the expander will apply to the signal that has passed through the HPF, and the signal that has passed through the LPF will then be mixed in. For COMP ON and HPF ON LPF + HPF COMPANDER H/S SELF POST EQ When LPF (low pass filter) is on, the expander will apply to the signal that has passed through the LPF, and the signal that has passed through the HPF will then be mixed in. For COMP ON and LPF ON HPF + LPF COMPANDER H/S SELF POST EQ If you want the signal immediately after passing through the LPF or HPF to be used as the key-in signal for the internal compressor, select SELF POST EQ as the key-in signal. When the key-in signal is set to LEFT CH (when the key-in signal is taken from the previous-numbered channel), and if COMP is turned on and LPF or HPF is also turned on for the channel that is the source of the key-in signal, then the signal after passing through the filter will be output as the keyin signal. INPUT FILTER ON/OFF-This turns the input filter on/ off. If off, the LPF/HPF setting will be ignored. INPUT FILTER FREQUENCY-This sets the cutoff frequency of the LPF/HPF. (The LPF cutoff frequency and HPF cutoff frequency are always linked.) 15