From brodriguez@inria.fr Mon Nov 28 22:30:16 1994 Path: ashpoly!cascade!mxgate!coyoacan!inria!brodriguez From: brodriguez@inria.fr (Bastien Rodríguez) Newsgroups: comp.dsp Subject: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Nov28.223016.3042@inria.fr> Date: Mon, 28 Nov 1994 22:30:16 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. However, when downsampling from 44.1 kHz to 64 Hz, accumulator overflow in the biquad IIR filter can destabilize the loop. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Bastien Rodríguez *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From bsmirnov@netcom.com Wed Nov 30 00:43:16 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!bsmirnov From: bsmirnov@netcom.com (Bastien Smirnov) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Nov30.004316.6579@netcom.com> Date: Wed, 30 Nov 1994 00:43:16 GMT References: <1994Nov28.223016.3042@inria.fr> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov28.223016.3042@inria.fr>, brodriguez@inria.fr (Bastien Rodríguez) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Bastien Smirnov | bsmirnov@netcom.com PGP Key fingerprint: E380 18D9 13A0 859F "Keep the channels open."