From nlopez@netcom.com Tue Dec 26 18:44:44 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!nlopez From: nlopez@netcom.com (Nadine López) Newsgroups: comp.dsp Subject: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Dec26.184444.4876@netcom.com> Date: Tue, 26 Dec 1995 18:44:44 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. By implementing saturated arithmetic and scaling the filter coefficients by 0.5, the loop runs in 18 instruction cycles per sample. The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Nadine López | nlopez@netcom.com PGP Key fingerprint: 95F8 0DDF F882 C12E "Keep the channels open." From ilopez@hanse.de Thu Dec 28 16:46:44 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!ilopez From: ilopez@hanse.de (Ines López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Dec28.164644.2122@hanse.de> Date: Thu, 28 Dec 1995 16:46:44 GMT References: <1995Dec26.184444.4876@netcom.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec26.184444.4876@netcom.com>, nlopez@netcom.com (Nadine López) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Ines López Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From rpetrov@cern.ch Sat Dec 30 19:37:44 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!rpetrov From: rpetrov@cern.ch (Renata Petrov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Dec30.193744.2118@cern.ch> Date: Sat, 30 Dec 1995 19:37:44 GMT References: <1995Dec26.184444.4876@netcom.com> <1995Dec28.164644.2122@hanse.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec28.164644.2122@hanse.de>, ilopez@hanse.de (Ines López) writes: > Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Renata Petrov "The hatch is open. Is anyone listening?" Sun SparcStation 20 / TOS 4.04 From plee@rwth-aachen.de Mon Jan 01 13:09:44 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!plee From: plee@rwth-aachen.de (Pavel Lee) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan01.130944.2524@rwth-aachen.de> Date: Mon, 01 Jan 1996 13:09:44 GMT References: <1995Dec26.184444.4876@netcom.com> <1995Dec28.164644.2122@hanse.de> <1995Dec30.193744.2118@cern.ch> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec30.193744.2118@cern.ch>, rpetrov@cern.ch (Renata Petrov) writes: > Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- === Pavel Lee === Dept of Electrical Engineering, RWTH Aachen Informatik "Tape doesn't lie at 02:14. Ears do." From alaurent@mindspring.com Mon Jan 01 23:52:44 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!alaurent From: alaurent@mindspring.com (Andrei Laurent) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan01.235244.4724@mindspring.com> Date: Mon, 01 Jan 1996 23:52:44 GMT References: <1995Dec26.184444.4876@netcom.com> <1995Dec28.164644.2122@hanse.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec28.164644.2122@hanse.de>, ilopez@hanse.de (Ines López) writes: > Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Andrei Laurent | alaurent@mindspring.com PGP Key fingerprint: AAB5 D8FE A70E F126 "Keep the channels open."