32
SunSDR2 PRO User Manual
© 2018 Expert Electronics
ExpertSDR2 SOFTWARE DESCRIPTION
Compressor – is used to reduce
dynamic range of the audio signal, in other words, compressor reduces the difference between
the quietest and the loudest sounds.
Compressor automatically controls the volume. Downward compression reduces loud sounds
over a certain Threshold while quiet sounds remain unaffected.
Compression may improve sound audibility in loud places, where background noises may
suppress quiet sounds. While loud sounds will be easily audible, quiet sounds won’t be audible,
and if you’ll increase overall volume, it will improve the situation for quiet sounds, but loud sounds
will become unbearable. If you’ll apply the downward compression to this audio, the overall
volume may be increased to the level when both quiet and loud sounds will be comfortable to
listen.
Paramet ers:
Rat io – determines the ratio of input/output signals which exceed Threshold. For example,
ratio of 3:1 means that if input level is 3 dB over the threshold, the output signal level is 1 dB
over the threshold.
Threshold – a compressor reduces the level of an audio signal if its amplitude exceeds a certain
threshold. It is set in decibels dB.
Compressor may be adjusted in a way how fast it reacts:
At t ack – this is the period, when the compressor is decreasing volume to reach the level that is
determined by Rat io. It is activated when the signal exceeds Threshold and, if each
consecutive signal has higher volume than the signal before it.
Release - this is the period, when the compressor stops compression, increasing signal volume
to the default level. It is activated right after At t ack period is finished. Each time, when after the
compressed signal goes the next one, which is lower than Threshold or higher, but lower than
the compressed one before it, then instead of At t ack, Release is applied for each consecutive
signal like this one and compressor stops compression according to Release settings. Whether
there will be a compression or not while Release period, depends on the set time. If in
Release period signal is compressed, it is compressed with the same Ratio (dB) as the signal
before it. Only in that case sounds lower than Threshold may be compressed.
Содержание SunSDR2 Pro
Страница 2: ......
