From aschneider@purdue.edu Tue Mar 12 12:05:07 1996 Path: ashpoly!cascade!bigsur!purdue!aschneider From: aschneider@purdue.edu (Anton Schneider) Newsgroups: comp.dsp Subject: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar12.120507.4037@purdue.edu> Date: Tue, 12 Mar 1996 12:05:07 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. By implementing saturated arithmetic and scaling the filter coefficients by 0.5, the loop runs in 18 instruction cycles per sample. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Anton Schneider -- Purdue University Engineering Computer Network "We don't sign stars. We build them." From hvasiliev@ox.ac.uk Thu Mar 14 15:37:07 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!hvasiliev From: hvasiliev@ox.ac.uk (Hana Vasiliev) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar14.153707.3319@ox.ac.uk> Date: Thu, 14 Mar 1996 15:37:07 GMT References: <1996Mar12.120507.4037@purdue.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Mar12.120507.4037@purdue.edu>, aschneider@purdue.edu (Anton Schneider) writes: > 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. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- === Hana Vasiliev === Dept of Electrical Engineering, Oxford University Computing Laboratory "Do not worship the copy." From tsilva@hanse.de Sat Mar 16 19:18:07 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!tsilva From: tsilva@hanse.de (Thiago Silva) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar16.191807.1606@hanse.de> Date: Sat, 16 Mar 1996 19:18:07 GMT References: <1996Mar12.120507.4037@purdue.edu> <1996Mar14.153707.3319@ox.ac.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Mar14.153707.3319@ox.ac.uk>, hvasiliev@ox.ac.uk (Hana Vasiliev) 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. -- Thiago Silva Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From creyes@utexas.edu Sun Mar 17 04:03:07 1996 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!creyes From: creyes@utexas.edu (Camila Reyes) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar17.040307.2357@utexas.edu> Date: Sun, 17 Mar 1996 04:03:07 GMT References: <1996Mar12.120507.4037@purdue.edu> <1996Mar14.153707.3319@ox.ac.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Mar14.153707.3319@ox.ac.uk>, hvasiliev@ox.ac.uk (Hana Vasiliev) 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 Reyes -- University of Texas at Austin "There are 14 nodes and only 10 countries. Count again." From slindqvist@mindspring.com Mon Mar 18 15:14:07 1996 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!slindqvist From: slindqvist@mindspring.com (Steve Lindqvist) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar18.151407.2593@mindspring.com> Date: Mon, 18 Mar 1996 15:14:07 GMT References: <1996Mar12.120507.4037@purdue.edu> <1996Mar14.153707.3319@ox.ac.uk> <1996Mar16.191807.1606@hanse.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Mar16.191807.1606@hanse.de>, tsilva@hanse.de (Thiago Silva) writes: > Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! -- Steve Lindqvist Tape trading list upon request. SASE required for international mail.