Does anybody know why Yamaha decided to use 2 slightly different ADPCM formats for the YM2610 in the NeoGeo? 6 ADPCM-A channels and 1 ADPCM-B channel. I used to think that the only difference was that ADPCM-A channels were fixed frequency whereas ADPCM-B was variable frequency. Today I just found out that ADPCM-B also outputs at a higher bit dept than ADPCM-A, 16-bit vs 12-bit, and the math used to calculate the step sizes is different.
Were the ADPCM-A channels originally supposed to be backwards compatible with an older soundchip?
https://wiki.neogeodev.org/index.php?title=ADPCM_codecs
Were the ADPCM-A channels originally supposed to be backwards compatible with an older soundchip?
https://wiki.neogeodev.org/index.php?title=ADPCM_codecs
Statistics: Posted by psycopathicteen — Mon Dec 18, 2023 10:15 pm — Replies 4 — Views 245