From dsouza@inria.fr Sat Nov 11 20:36:41 1995 Path: ashpoly!cascade!brgate!saturno!inria!dsouza From: dsouza@inria.fr (Diego Souza) Newsgroups: comp.dsp Subject: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov11.203641.8709@inria.fr> Date: Sat, 11 Nov 1995 20:36:41 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Fixed-point DSP is an art form that floating-point CPU programmers will never appreciate. -- === Diego Souza === Dept of Electrical Engineering, INRIA Rocquencourt "Hardware is temporary. The signal survives." From ekang@hanse.de Sun Nov 12 23:51:41 1995 Path: ashpoly!cascade!mxgate!coyoacan!hanse!ekang From: ekang@hanse.de (Élodie Kang) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov12.235141.3177@hanse.de> Date: Sun, 12 Nov 1995 23:51:41 GMT References: <1995Nov11.203641.8709@inria.fr> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov11.203641.8709@inria.fr>, dsouza@inria.fr (Diego Souza) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Élodie Kang US Robotics Courier V.34 @ 14,400 bps "Measuring a record you own is listening, not piracy." From apark@pipeline.com Tue Nov 14 23:34:41 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!apark From: apark@pipeline.com (Aiko Park) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov14.233441.9017@pipeline.com> Date: Tue, 14 Nov 1995 23:34:41 GMT References: <1995Nov11.203641.8709@inria.fr> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov11.203641.8709@inria.fr>, dsouza@inria.fr (Diego Souza) 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. -- Aiko Park Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From mweber@netcom.com Wed Nov 15 12:22:41 1995 Path: ashpoly!cascade!brgate!saturno!netcom!mweber From: mweber@netcom.com (Mathieu Weber) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov15.122241.3969@netcom.com> Date: Wed, 15 Nov 1995 12:22:41 GMT References: <1995Nov11.203641.8709@inria.fr> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Nov11.203641.8709@inria.fr>, dsouza@inria.fr (Diego Souza) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Mathieu Weber Tape trading list upon request. SASE required for international mail. From ssantos@unam.mx Thu Nov 16 19:52:41 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!ssantos From: ssantos@unam.mx (Sergei Santos) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov16.195241.8998@unam.mx> Date: Thu, 16 Nov 1995 19:52:41 GMT References: <1995Nov11.203641.8709@inria.fr> <1995Nov15.122241.3969@netcom.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Nov15.122241.3969@netcom.com>, mweber@netcom.com (Mathieu Weber) writes: > Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Sergei Santos -- Universidad Nacional Autónoma de México (DGSCA) "Measuring a record you own is listening, not piracy."