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Add an explanatory comment that got lost

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This comment was in the original sample decimator code, I neglected to
include it in my port over to Cog. Doesn't really serve any functional
change, though. It would have clarified that I needed to reduce the gain
level much sooner, though.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
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Christopher Snowhill 2023-07-14 04:10:10 -07:00
parent b2657700eb
commit 555b9f248d
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8
Audio/Chain/ChunkList.m
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@ -28,6 +28,14 @@
* @author Sebastian Gesemann * @author Sebastian Gesemann
*/ */
/**
* This is the 2nd half of an even order symmetric FIR
* lowpass filter (to be used on a signal sampled at 44100*64 Hz)
* Passband is 0-24 kHz (ripples +/- 0.025 dB)
* Stopband starts at 176.4 kHz (rejection: 170 dB)
* The overall gain is 2.0
*/
#define dsd2pcm_FILTER_COEFFS_COUNT 64 #define dsd2pcm_FILTER_COEFFS_COUNT 64
static const float dsd2pcm_FILTER_COEFFS[64] = { static const float dsd2pcm_FILTER_COEFFS[64] = {
0.09712411121659f, 0.09613438994044f, 0.09417884216316f, 0.09130441727307f, 0.09712411121659f, 0.09613438994044f, 0.09417884216316f, 0.09130441727307f,