Welcome to Emulationworld

Forum Index | FAQ | New User | Login | Search

Make a New Post*View All ThreadsNext ThreadShow in Flat Mode*


SubjectRe: YM2612 Envelope Generator Reply to this message
Posted bybcs
Posted on06/02/06 08:38 PM



Thanks for the answer. Acutally it's more complicated than that, because time periods depend more or less exponentially on the 6-bit rate values. And because for higher rate values, the time periods decrease.

The similar chip YM2413's manual gives a table:
http://www.smspower.org/maxim/docs/ym2413am/index.html#page13

The time is exactly divided by 2 every time RM increases, but it's difficult to devise a precise formula, and in any case I'm not even sure that during this period the volume decreases/increases linearly.

This could look like a detail that the ear wouldn't discriminate, but it's not because of the nature of FM synthesis (the resulting sound is not heard directly but is used to modulate another sinusoid). Very small time differences make big timbre differences in the final sound.




-
Entire Thread
Subject  Posted byPosted On
*YM2612 Envelope Generator  bcs05/16/06 08:31 PM
.*Re: YM2612 Envelope Generator  _Stef_07/10/06 06:14 AM
.*Re: YM2612 Envelope Generator  smf05/31/06 03:50 PM
...Re: YM2612 Envelope Generator  bcs06/02/06 08:38 PM