APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Instrukcja Użytkownika Pobierz pdf (Strona 39)

4.3 The FX View 39

Amplitude (dB)

0dB

Gain = 30 dB, Q = 2

Gain = 20 dB

Gain = 30 dB, Q = 5

Gain = 10 dB

Gain = 30 dB, Q = 2

Frequency (Hz)Freq

Figure 20: Peak ﬁlter.

Tuning

The level at which the Compressor starts to enter into action is determined by the value of the

Threshold parameter. This value is in dB and corresponds to the amplitude of the input signal as

monitored by the ﬁrst level meter of the module.

The amount of compression applied to the part of the signal exceeding the threshold value

depends on the Ratio parameter which varies between value of 1:1 and 1:16. This parameter

represents the ratio, in dB, between the portion of the output signal from the compressor above

the threshold value and the portion of its input signal also exceeding the threshold value. As one

might expect, increasing the ratio also increases the amount of compression applied to the signal.

For example, a ratio of 1:5 means that if the input signal exceeds the threshold by 5 dB, the output

signal will exceed the threshold by only 1 dB. Note that the Ratio parameter can also be adjusted

from the Play view.

Two other controls affect the behavior of the Compressor. The Attack knob is used to set the

time, in milliseconds, before the Compressor fully kicks in after the level of the input has exceeded

the threshold value. A short value means that the compressor reaches the amount of compression

as set by the Ratio knob rapidly. With a longer attack, this amount is reached more gradually. In

other words, the attack time is a measure of the attack transient time of the compression effect. The

Release parameter is similar and represents the amount of time taken by the Compressor to stop

compressing once the amplitude of the input signal falls below the threshold value.

The Makeup knob is used to adjust the overall level at the output of the Compressor module

and is used to compensate from an overall change in signal level due to the compression effect.

The location of the Compressor in the signal path depends on the setting of the Pre button.

When this parameter is on, the Compressor is located at the output of the synthesizer, just before

the EQ module. In this position, the input signal of the Compressor and its control signal are

both the output signal from the synthesizer. When the Pre button is off, the Compressor is located

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APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Instrukcja Użytkownika Strona 39