From rsantos@illinois.edu Mon Feb 13 07:37:35 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!rsantos From: rsantos@illinois.edu (Raj Santos) Newsgroups: comp.dsp Subject: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Feb13.073735.8537@illinois.edu> Date: Mon, 13 Feb 1995 07:37:35 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] 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? -- Raj Santos Practical Peripherals 14.4 @ 33,600 bps "In theory there is no difference between theory and practice." From hlindqvist@unam.mx Tue Feb 14 11:02:35 1995 Path: ashpoly!cascade!brgate!saturno!unam!hlindqvist From: hlindqvist@unam.mx (Hugo Lindqvist) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Feb14.110235.6990@unam.mx> Date: Tue, 14 Feb 1995 11:02:35 GMT References: <1995Feb13.073735.8537@illinois.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb13.073735.8537@illinois.edu>, rsantos@illinois.edu (Raj Santos) writes: > 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. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! -- === Hugo Lindqvist === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From hlaurent@clari.net Wed Feb 15 18:38:35 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!hlaurent From: hlaurent@clari.net (Hugo Laurent) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Feb15.183835.9587@clari.net> Date: Wed, 15 Feb 1995 18:38:35 GMT References: <1995Feb13.073735.8537@illinois.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb13.073735.8537@illinois.edu>, rsantos@illinois.edu (Raj Santos) 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! -- Hugo Laurent Practical Peripherals 14.4 @ 9600 Telebit bps "Hold for relay."