Yamaha CS1D Owner's Manual - Page 546
COMPANDER (HARD & SOFT), This sets the cutoff fre
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Appendices RATIO-This determines the amount of expansion. That is, the change in output signal level relative to change in input signal level. For a 2:1 ratio, for example, a 5 dB change in input level (below the threshold) results in a 10 dB change in output level. For a 5:1 ratio, a 2 dB change in input level (below the threshold) results in a 10 dB change in output level. 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 EXPANDER 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. COMPANDER (HARD & SOFT) The hard (H) and soft (S) companders comprise of compressor, expander, and limiter. The limiter prevents output signals from exceeding 0 dB. The compressor compresses signals that exceed the threshold level. The expander attenuates signals below the threshold and width. The soft compander has an expansion ratio of 1.5:1, while the hard compander has an expansion ratio of 5:1. The following two graphs show typical compander curves. The one on the left shows the hard compander. The one on the right, the soft compander. For COMP ON and LPF ON HPF + LPF EXPANDER 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.) Output Level (dB) Output Level (dB) +20 +10 Width 0 -10 -20 -30 -40 -50 -60 -70 Threshold -70 -60 -50 -40 -30 -20 -10 0 +10 +20 Input Level (dB) Hard Compander +20 +10 Width 0 -10 -20 -30 -40 -50 -60 -70 Threshold -70 -60 -50 -40 -30 -20 -10 0 +10 +20 Input Level (dB) Soft Compander 14