Compressor
Square ONE Dynamics 19
Compressor
Principles of compression
One of the principal uses of compression is the control of level in vocals. Many singers train for years to
achieve the degree of breath control necessary for an even tone and expressive performance. Whereas,
other vocalists rely on an instinctive voice production technique, which may need technological assistance to
maintain a consistent level that sits correctly in the programme.
The level of a vocal may vary widely. As shown in the typical example in Figure 8 “Compression - signal level
graphs”, the unprocessed signal has a large dynamic range between the highest and lowest levels. Applying
compression reduces the highest levels, thus reducing the dynamic range, while leaving the signal below
threshold relatively unaltered. Because the peak level of the signal is now lower, make up gain is added to
restore the original peak level. The result is a much more controlled and usable sound.
Figure 8: Compression - signal level graphs
Unprocessed signal
Time
Threshold level
Signal level
3:1 Compression above threshold
With make up gain added
Time
Threshold level
Signal level
Time
Signal level
Threshold level
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