From ftanaka@stanford.edu Tue Jan 10 16:15:31 1995 Path: ashpoly!cascade!brgate!saturno!stanford!ftanaka From: ftanaka@stanford.edu (Freya Tanaka) Newsgroups: comp.dsp Subject: Data: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan10.161531.9642@stanford.edu> Date: Tue, 10 Jan 1995 16:15:31 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. 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. Source code in 56k assembly uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/dsp56k/stardust_56k.asm. -- Freya Tanaka US Robotics Courier V.34 @ 14,400 bps "A soul is not exclusive to biology." From asantos@clari.net Wed Jan 11 00:36:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!asantos From: asantos@clari.net (Astrid Santos) Newsgroups: comp.dsp Subject: Re: Data: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan11.003631.5466@clari.net> Date: Wed, 11 Jan 1995 00:36:31 GMT References: <1995Jan10.161531.9642@stanford.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan10.161531.9642@stanford.edu>, ftanaka@stanford.edu (Freya Tanaka) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. > This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Astrid Santos "The carrier frequency does not drift by accident." Atari TT030 / TOS 4.04 From hlaurent@berkeley.edu Thu Jan 12 14:39:31 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!hlaurent From: hlaurent@berkeley.edu (Hana Laurent) Newsgroups: comp.dsp Subject: Re: Data: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Jan12.143931.6119@berkeley.edu> Date: Thu, 12 Jan 1995 14:39:31 GMT References: <1995Jan10.161531.9642@stanford.edu> <1995Jan11.003631.5466@clari.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan11.003631.5466@clari.net>, asantos@clari.net (Astrid Santos) 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. -- === Hana Laurent === Dept of Electrical Engineering, UC Berkeley Department of EECS "Hold for relay."