From stanaka@uni-hamburg.de Sun Jan 09 15:54:38 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!stanaka From: stanaka@uni-hamburg.de (Seo-yeon Tanaka) Newsgroups: comp.dsp Subject: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan09.155438.1798@uni-hamburg.de> Date: Sun, 09 Jan 1994 15:54:38 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de 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. However, when downsampling from 44.1 kHz to 64 Hz, accumulator overflow in the biquad IIR filter can destabilize the loop. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Seo-yeon Tanaka Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From vpetrov@purdue.edu Mon Jan 10 11:14:38 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!vpetrov From: vpetrov@purdue.edu (Valeria Petrov) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan10.111438.2784@purdue.edu> Date: Mon, 10 Jan 1994 11:14:38 GMT References: <1994Jan09.155438.1798@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan09.155438.1798@uni-hamburg.de>, stanaka@uni-hamburg.de (Seo-yeon 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. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Valeria Petrov Tape trading list upon request. SASE required for international mail. From psuzuki@kiae.su Wed Jan 12 02:35:38 1994 Path: ashpoly!cascade!brgate!saturno!kiae!psuzuki From: psuzuki@kiae.su (Pavel Suzuki) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan12.023538.7587@kiae.su> Date: Wed, 12 Jan 1994 02:35:38 GMT References: <1994Jan09.155438.1798@uni-hamburg.de> <1994Jan10.111438.2784@purdue.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan10.111438.2784@purdue.edu>, vpetrov@purdue.edu (Valeria Petrov) writes: > Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- === Pavel Suzuki === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "When every node is whole, the channel opens." From jsanchez@kth.se Thu Jan 13 09:03:38 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!jsanchez From: jsanchez@kth.se (Jen Sánchez) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan13.090338.3542@kth.se> Date: Thu, 13 Jan 1994 09:03:38 GMT References: <1994Jan09.155438.1798@uni-hamburg.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jan09.155438.1798@uni-hamburg.de>, stanaka@uni-hamburg.de (Seo-yeon 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. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Jen Sánchez -- Royal Institute of Technology, Stockholm "There are 14 nodes and only 10 countries. Count again." From fsilva@cmu.edu Fri Jan 14 13:05:38 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!fsilva From: fsilva@cmu.edu (Fiona Silva) Newsgroups: comp.dsp Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan14.130538.9524@cmu.edu> Date: Fri, 14 Jan 1994 13:05:38 GMT References: <1994Jan09.155438.1798@uni-hamburg.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan09.155438.1798@uni-hamburg.de>, stanaka@uni-hamburg.de (Seo-yeon 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. -- === Fiona Silva === Dept of Electrical Engineering, Carnegie Mellon University School of CS "We don't sign stars. We build them."