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So I took the compander circuit of the Roland VP - 330, and adjusted time constants for an application where input- and output waveforms aren't similar anymore.
It can be seen that, for optimum results, a compander designed for magnetic studio recording will, at best, give a compromise in performance when used for photographic sound recording.
When using both compression and the compander , set the compressor initially at 3 db and the compander at level 3.
Another variation is the compander (compressor/expander) which intentionally ‘flattens’ audio dynamic range for musical purposes.
To ensure noise measurements on digital carriers (PCM systems) are valid, a holding tone must be transmitted to operate the compander and quantizing circuitry in its normal operating range.
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