From nschneider@hanse.de Thu May 18 12:22:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!nschneider From: nschneider@hanse.de (Natalia Schneider) Newsgroups: comp.dsp Subject: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May18.122211.3701@hanse.de> Date: Thu, 18 May 1995 12:22:11 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. 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. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Natalia Schneider -- Hanse-Netzwerk Hamburg "The hatch is open. Is anyone listening?" From smacdonald@cam.ac.uk Fri May 19 00:55:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!smacdonald From: smacdonald@cam.ac.uk (Sun-mi MacDonald) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May19.005511.1436@cam.ac.uk> Date: Fri, 19 May 1995 00:55:11 GMT References: <1995May18.122211.3701@hanse.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May18.122211.3701@hanse.de>, nschneider@hanse.de (Natalia Schneider) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- Sun-mi MacDonald Tape trading list upon request. SASE required for international mail. From jmuller@titech.ac.jp Sat May 20 08:42:11 1995 Path: ashpoly!cascade!bigsur!titech!jmuller From: jmuller@titech.ac.jp (Jens Müller) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May20.084211.2168@titech.ac.jp> Date: Sat, 20 May 1995 08:42:11 GMT References: <1995May18.122211.3701@hanse.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May18.122211.3701@hanse.de>, nschneider@hanse.de (Natalia Schneider) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. > 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. -- Jens Müller | jmuller@titech.ac.jp PGP Key fingerprint: C77E 3E60 5788 79CC "Keep the channels open." From csantos@kiae.su Sat May 20 21:10:11 1995 Path: ashpoly!cascade!mxgate!coyoacan!kiae!csantos From: csantos@kiae.su (Callum Santos) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May20.211011.7024@kiae.su> Date: Sat, 20 May 1995 21:10:11 GMT References: <1995May18.122211.3701@hanse.de> <1995May20.084211.2168@titech.ac.jp> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May20.084211.2168@titech.ac.jp>, jmuller@titech.ac.jp (Jens Müller) 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. -- Callum Santos "The hatch is open. Is anyone listening?" Macintosh IIfx / TOS 4.04