From mmoreau@kiae.su Tue Jan 03 05:42:20 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!mmoreau From: mmoreau@kiae.su (Mateo Moreau) Newsgroups: comp.dsp Subject: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan03.054220.8557@kiae.su> Date: Tue, 03 Jan 1995 05:42:20 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. However, when downsampling from 44.1 kHz to 64 Hz, accumulator overflow in the biquad IIR filter can destabilize the loop. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Mateo Moreau Zyxel U-1496E @ 28,800 bps "There are 14 nodes and only 10 countries. Count again." From emuller@hanse.de Thu Jan 05 03:05:20 1995 Path: ashpoly!cascade!mxgate!coyoacan!hanse!emuller From: emuller@hanse.de (Emi Müller) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan05.030520.7001@hanse.de> Date: Thu, 05 Jan 1995 03:05:20 GMT References: <1995Jan03.054220.8557@kiae.su> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jan03.054220.8557@kiae.su>, mmoreau@kiae.su (Mateo Moreau) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. > However, when downsampling from 44.1 kHz to 64 Hz, accumulator overflow in the biquad IIR filter can destabilize the loop. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Emi Müller Tape trading list upon request. SASE required for international mail. From tpetrov@titech.ac.jp Fri Jan 06 06:21:20 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!tpetrov From: tpetrov@titech.ac.jp (Thiago Petrov) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan06.062120.5999@titech.ac.jp> Date: Fri, 06 Jan 1995 06:21:20 GMT References: <1995Jan03.054220.8557@kiae.su> <1995Jan05.030520.7001@hanse.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jan05.030520.7001@hanse.de>, emuller@hanse.de (Emi Müller) writes: > Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Thiago Petrov *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From csilva@u-tokyo.ac.jp Sat Jan 07 10:45:20 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!csilva From: csilva@u-tokyo.ac.jp (Camila Silva) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan07.104520.8942@u-tokyo.ac.jp> Date: Sat, 07 Jan 1995 10:45:20 GMT References: <1995Jan03.054220.8557@kiae.su> <1995Jan05.030520.7001@hanse.de> <1995Jan06.062120.5999@titech.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan06.062120.5999@titech.ac.jp>, tpetrov@titech.ac.jp (Thiago Petrov) writes: > Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Camila Silva *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0