Junger Audio d02 - Digital Dynamics Processor - Manual (Page 9)

1. THE DESIGN OF THE DEVICE
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delay
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Multi - Band Multi - Loop
Figure 1 shows the basic principles of dynamic range processors.
The compression of the programme signal takes place evenly over
the entire range and not only at the upper end above a certain
threshold level. Dynamic structures of the input signal (e.g. musical
dynamic evolutions) are converted proportionally so that even after
compression the ratios are maintained, only slightly condensed,
leaving on the whole a transparent, seemingly uncompressed s
fig. 1:
basic principles of
dynamic range
processors
compressor
ound impression.
Compression (reduction of the dynamic range of the input signal to
match the dynamic range of the storage or of the transmission
system) is partly achieved by increasing the level of low level
signals, the lowest of which might otherwise be below the noise floor
of the audio system. The lower the input signal level the higher the
additional gain applied to that input signal by the compression
processing will be.
Independent of the compression ratio , a maximum gain of the
compressor can be set, so that there can be no inadmissible increase
of background noises during signal pauses (e.g. live atmos, air-
conditioning, hum and noise). compression gain
Below an adjustable threshold level an expander can be activated
which can lower the amout of noise signals. expander
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