Applying Echo and Reverb effect

Posted on 2006-04-25
Medium Priority
Last Modified: 2012-05-07
Dear Experts,

We have a LPVOID type of buffer which stores data corresponding 1 second of a wave file( 16 bit, 2 channel  and 44.1Khz).
That is, at one time it stores 176400 bytes of audio data.
Kindly let me know the algorithm of applying Echo and Reverb effect on the one second buffer.

Question by:HanuSoftware

Accepted Solution

chip3d earned 500 total points
ID: 16542229
You can find information an this page: http://www.harmony-central.com/Effects/audio-effects-faq-10.txt (also code examples)
LVL 22

Assisted Solution

grg99 earned 500 total points
ID: 16542518
Echo  algorithm:

EchoSpacing := EchoSeconds * SampleRate;  EchoVolume := 0.3333;

for i := 0 to TheEnd - EchoSpacing do  data[ i + EchoSpacing ] += data[ i ] * EchoVolume;

Reverb is the same, only repeated at decreasing volume:

EchoSpacing := EchoSeconds * SampleRate;  EchoVolume := 0.3333;  ReverbTimes := 5;

for i := 0 to TheEnd - EchoSpacing do  
                  Rvol := EchoVolume; Where := i + EchoSpacing;
                  for j := 1 to ReverbTimes do
                         data[ Where ] += data[ i ] * RVol;
                         RVol /= EchoVolume;  Where += EchoSpacing;


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