Audacity Forum

Hi Gale, Perhaps I did not explain very clear.. - "Sine-1KHz-16x16-5s_SWgenerated (modified)" is PCM data. - I use Audacity to open, and export into "Sine-1KHz-16x16-5s_SWgenerated (IMA ADPCM)" - data DE 39 4F 00 is at offset 572 of "Sine-1KHz-16x16-5s_SWgenerated (IMA ADPCM)" file I'm not expert in...

Hi Gale, I've take a look at libsndfile, in particulare ima_adpcm.c static int wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) { /* Encode the block header. */ for (chan = 0 ; chan < pima->channels ; chan++) { pima->block [chan*4] = pima->samples [chan] & 0xFF ; pima->block [chan...

Hi Gale, Thanks for your reply First of all, I did not claim this is Audacity bug and I myself do not think so anyway. I was merely looking for advices from those who have experience in this field. "What do you mean by "fed into Audacity"? Do you mean record or import? " ==> I used Audacity to open ...

Hi guys, I'm implementing IMA ADPCM compression based on algorithm from Microchip (also attached here). and package data into WAV format. However, there is distortion in compressed data My testing method: - generate a 5s of PCM data : 16kHz x 16 bit. File name: "Sine-1KHz-16x16-5s_SWgenerated (modif...