Dyson compressor
delay);
free(plugin_data->rlevelsqn);
free(plugin_data->rlevelsqe);
]]>
= ndelay) {
ndelayptr = 0;
}
if (levelsq0 > rlevelsq0) {
rlevelsq0 = (levelsq0 * RLEVELSQ0FFILTER) +
rlevelsq0 * (1 - RLEVELSQ0FFILTER);
} else {
rlevelsq0 = (levelsq0 * RLEVELSQ0FILTER) +
rlevelsq0 * (1 - RLEVELSQ0FILTER);
}
if (rlevelsq0 <= FLOORLEVEL * FLOORLEVEL) {
goto skipagc;
}
if (rlevelsq0 > rlevelsq1) {
rlevelsq1 = rlevelsq0;
} else {
rlevelsq1 = rlevelsq0 * RLEVELSQ1FILTER +
rlevelsq1 * (1 - RLEVELSQ1FILTER);
}
rlevelsqn[0] = rlevelsq1;
for(i = 0; i < NFILT-1; i++) {
if (rlevelsqn[i] > rlevelsqn[i+1])
rlevelsqn[i+1] = rlevelsqn[i];
else
rlevelsqn[i+1] = rlevelsqn[i] * RLEVELSQ1FILTER +
rlevelsqn[i+1] * (1 - RLEVELSQ1FILTER);
}
efilt = RLEVELSQEFILTER;
levelsqe = rlevelsqe[0] = rlevelsqn[NFILT-1];
for(i = 0; i < NEFILT-1; i++) {
rlevelsqe[i+1] = rlevelsqe[i] * efilt +
rlevelsqe[i+1] * (1.0 - efilt);
if (rlevelsqe[i+1] > levelsqe)
levelsqe = rlevelsqe[i+1];
efilt *= 1.0f / 1.5f;
}
gain = targetlevel / sqrt(levelsqe);
if (compressionratio < 0.99f) {
if (compressionratio == 0.50f)
gain = sqrt(gain);
else
gain = f_exp(log(gain) * compressionratio);
}
if (gain < rgain)
rgain = gain * RLEVELSQEFILTER/2 +
rgain * (1 - RLEVELSQEFILTER/2);
else
rgain = gain * rgainfilter +
rgain * (1 - rgainfilter);
lastrgain = rgain;
if ( gain < lastrgain)
lastrgain = gain;
skipagc:;
tgain = lastrgain;
d = delay[ndelayptr];
fastgain = tgain;
if (fastgain > MAXFASTGAIN)
fastgain = MAXFASTGAIN;
if (fastgain < 0.0001)
fastgain = 0.0001;
qgain = f_exp(log(fastgain) * fastgaincompressionratio);
tslowgain = tgain / qgain;
if (tslowgain > MAXSLOWGAIN)
tslowgain = MAXSLOWGAIN;
if (tslowgain < rmastergain0)
rmastergain0 = tslowgain;
else
rmastergain0 = tslowgain * RMASTERGAIN0FILTER +
(1 - RMASTERGAIN0FILTER) * rmastergain0;
slowgain = rmastergain0;
npeakgain = slowgain * qgain;
new = d * npeakgain;
if (fabs(new) >= MAXLEVEL)
nrgain = MAXLEVEL / fabs(new);
else
nrgain = 1.0;
ngain = nrgain;
ngsq = ngain * ngain;
if (ngsq <= rpeakgain0) {
rpeakgain0 = ngsq /* * 0.50 + rpeakgain0 * 0.50 */;
rpeaklimitdelay = peaklimitdelay;
} else if (rpeaklimitdelay == 0) {
if (nrgain > 1.0)
tnrgain = 1.0;
else
tnrgain = nrgain;
rpeakgain0 = tnrgain * RPEAKGAINFILTER +
(1.0 - RPEAKGAINFILTER) * rpeakgain0;
}
if (rpeakgain0 <= rpeakgain1) {
rpeakgain1 = rpeakgain0;
rpeaklimitdelay = peaklimitdelay;
} else if (rpeaklimitdelay == 0) {
rpeakgain1 = RPEAKGAINFILTER * rpeakgain0 +
(1.0 - RPEAKGAINFILTER) * rpeakgain1;
} else {
--rpeaklimitdelay;
}
sqrtrpeakgain = sqrt(rpeakgain1);
totalgain = npeakgain * sqrtrpeakgain;
buffer_write(output[pos], new * sqrtrpeakgain);
if (totalgain > maxgain)
maxgain = totalgain;
if (totalgain < mingain)
mingain = totalgain;
if (output[pos] > extra_maxlevel)
extra_maxlevel = output[pos];
}
plugin_data->ndelayptr = ndelayptr;
plugin_data->rlevelsq0 = rlevelsq0;
plugin_data->rlevelsq1 = rlevelsq1;
plugin_data->mingain = mingain;
plugin_data->maxgain = maxgain;
plugin_data->rpeaklimitdelay = rpeaklimitdelay;
plugin_data->rgain = rgain;
plugin_data->rmastergain0 = rmastergain0;
plugin_data->rpeakgain0 = rpeakgain0;
plugin_data->rpeakgain1 = rpeakgain1;
plugin_data->lastrgain = lastrgain;
plugin_data->extra_maxlevel = extra_maxlevel;
]]>
Peak limit (dB)
Controls the desired limit of the output signal in dB's.
Release time (s)
Controls the time taken for the compressor to relax its gain control over the input signal.
Fast compression ratio
I have no clear idea what this controls.
Compression ratio
I have no clear idea what this controls.
Input
Output