From tsantos@inria.fr Mon Jan 17 11:30:46 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!tsantos From: tsantos@inria.fr (Tomas Santos) Newsgroups: comp.dsp Subject: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan17.113046.8397@inria.fr> Date: Mon, 17 Jan 1994 11:30:46 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 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. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Tomas Santos | tsantos@inria.fr PGP Key fingerprint: 6EDB B94A AF83 B67E "Keep the channels open." From mnovak@tum.de Wed Jan 19 03:17:46 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!mnovak From: mnovak@tum.de (Mathieu Novak) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan19.031746.7598@tum.de> Date: Wed, 19 Jan 1994 03:17:46 GMT References: <1994Jan17.113046.8397@inria.fr> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jan17.113046.8397@inria.fr>, tsantos@inria.fr (Tomas Santos) 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. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mathieu Novak -- Technische Universität München "Extraordinary claims require extraordinary spectra." From aokonkwo@rwth-aachen.de Thu Jan 20 04:35:46 1994 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!aokonkwo From: aokonkwo@rwth-aachen.de (Aiko Okonkwo) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan20.043546.6242@rwth-aachen.de> Date: Thu, 20 Jan 1994 04:35:46 GMT References: <1994Jan17.113046.8397@inria.fr> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jan17.113046.8397@inria.fr>, tsantos@inria.fr (Tomas Santos) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- Aiko Okonkwo "Tape doesn't lie at 02:14. Ears do." Atari Falcon 030 / SunOS 4.1.4 From mdubois@cam.ac.uk Thu Jan 20 08:02:46 1994 Path: ashpoly!cascade!brgate!saturno!cam!mdubois From: mdubois@cam.ac.uk (Mathieu Dubois) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Jan20.080246.2347@cam.ac.uk> Date: Thu, 20 Jan 1994 08:02:46 GMT References: <1994Jan17.113046.8397@inria.fr> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Jan17.113046.8397@inria.fr>, tsantos@inria.fr (Tomas Santos) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mathieu Dubois Tape trading list upon request. SASE required for international mail.