HoRNet CompExp is a compressor expander based on the
design of a commander chip designed for telephone
lines and used in many electronic devices to reduce
The chip works with a fixed threshold (in our case
is internally set to -18dBFS) when the “amount” knob
is at a value greater than 1 the gain is increased
by the specified factor if the signal is below the
threshold, and decreased if above. If the chip is
set to work as an expander, the contrary happens,
the gain is increased if above the threshold and
decreased if below. The system is designed this way
to permit dynamic compression on telephone lines and
compressor and expander are used together in this
configuration, but we found that these models sounds
interesting by themselves.
The model of this chip is implemented in the HoRNet
HDD1 where is used to keep the noise down in the
delay feedback loop.
Internally the gain is compensated so that the
output is always kept to around -18dB RMS
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