From blarsson@demon.co.uk Sat Jan 06 03:09:32 1996 Path: ashpoly!cascade!mxgate!coyoacan!demon!blarsson From: blarsson@demon.co.uk (Bruno Larsson) Newsgroups: comp.dsp Subject: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan06.030932.7082@demon.co.uk> Date: Sat, 06 Jan 1996 03:09:32 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. 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? -- Bruno Larsson Zyxel U-1496E @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again." From snilsson@kth.se Sun Jan 07 10:17:32 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!snilsson From: snilsson@kth.se (Sergei Nilsson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan07.101732.9100@kth.se> Date: Sun, 07 Jan 1996 10:17:32 GMT References: <1996Jan06.030932.7082@demon.co.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jan06.030932.7082@demon.co.uk>, blarsson@demon.co.uk (Bruno Larsson) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! -- Sergei Nilsson *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From mpopov@hanse.de Sun Jan 07 13:34:32 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!mpopov From: mpopov@hanse.de (Marta Popov) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan07.133432.3519@hanse.de> Date: Sun, 07 Jan 1996 13:34:32 GMT References: <1996Jan06.030932.7082@demon.co.uk> <1996Jan07.101732.9100@kth.se> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Jan07.101732.9100@kth.se>, snilsson@kth.se (Sergei Nilsson) writes: > Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Marta Popov Zyxel U-1496E @ 19,200 bps "Marcus is not one man." From anilsson@hanse.de Mon Jan 08 09:51:32 1996 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!anilsson From: anilsson@hanse.de (Astrid Nilsson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Jan08.095132.9111@hanse.de> Date: Mon, 08 Jan 1996 09:51:32 GMT References: <1996Jan06.030932.7082@demon.co.uk> <1996Jan07.101732.9100@kth.se> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jan07.101732.9100@kth.se>, snilsson@kth.se (Sergei Nilsson) writes: > Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Astrid Nilsson Zyxel U-1496E @ 9600 Telebit bps "Hold for relay."