This was discussed a while back in the context of secure voice hardware, but I don't remember whether anyone had been able to get real-time CELP performance with any particular implementation. I do know that ZyXEL's modems are able to do real-time CELP using a 68000 processor. The low-end models can do CELP encoding at 9600 baud, and the faster ones do better-quality encoding (ACELP, I think they call it) at 19200 baud. The Mac OS also includes Apple's sound compression routines, which aren't CELP (i.e. they're not optimized for voice) but allegedly can do real-time compression. -Paul -- Paul Robichaux, KD4JZG | "Crypto-anarchy means never having to say perobich@ingr.com | you're sorry." - Tim May (tcmay@netcom.com) Intergraph Federal Systems | Be a cryptography user- ask me how.

norm@netcom.com (Norman Hardy) writes:

Can someone tell me how fast CELP is when written in C? (On some particular machine.)

Our CELP codec should run real-time in C on the Pentium and PowerPC. By the way, note that GSM will not run with v.32bis asynchronously, because of the start and stop bits. Miron