Safe Sound Audio P501 User Manual download pdf (Page 9)

P501 Audio Processor User Manual Page 9

Notice that the pure tone audio signal is beginning to lose its smooth

top and bottom curves and begins to resemble a triangular

waveform. This is not just an issue for bass guitar and bass drum

compression. Many audio sources including piano and vocals have

either a primary low frequency ‘carrier’ component and

vibrato/tremolo induced low frequency components. All can cause

audible distortion when being compressed or limited.

The peakride

design overcomes these problems by the use of three

separate control side-chains which act in the time domain (rather

than in the frequency domain of a multi-band compressor).

Above the compressor’s threshold;

Short duration audio bursts (such as percussion) get processed with

the fast attack fast release compression which they tend to require.

Longer duration audio bursts get processed with an initial attack time

as set on the front panel and an initial short release time but; as the

audio sample continues, the attack and release times are

progressively lengthened according to two factors;

 The time the audio sample has been above the compressor

threshold

 The continuing dynamics of the audio signal

A second problem with traditional fast attack compressor designs is

caused by a misunderstanding between the desirability for fast

attack, especially to provide adequate control of certain vocal styles,

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Safe Sound Audio P501 User Manual Page 9