From hsilva@kth.se Mon Nov 20 23:14:39 1995 Path: ashpoly!cascade!mxgate!coyoacan!kth!hsilva From: hsilva@kth.se (Hugo Silva) Newsgroups: comp.dsp Subject: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov20.231439.6543@kth.se> Date: Mon, 20 Nov 1995 23:14:39 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Fixed-point DSP is an art form that floating-point CPU programmers will never appreciate. -- Hugo Silva Tape trading list upon request. SASE required for international mail. From jjohansson@clari.net Tue Nov 21 16:03:39 1995 Path: ashpoly!cascade!brgate!saturno!clari!jjohansson From: jjohansson@clari.net (Joachim Johansson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov21.160339.2177@clari.net> Date: Tue, 21 Nov 1995 16:03:39 GMT References: <1995Nov20.231439.6543@kth.se> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov20.231439.6543@kth.se>, hsilva@kth.se (Hugo Silva) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Joachim Johansson | jjohansson@clari.net PGP Key fingerprint: 83E9 B028 6E0B A528 "Keep the channels open." From mramirez@delphi.com Wed Nov 22 09:38:39 1995 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!mramirez From: mramirez@delphi.com (Mathieu Ramírez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995Nov22.093839.5210@delphi.com> Date: Wed, 22 Nov 1995 09:38:39 GMT References: <1995Nov20.231439.6543@kth.se> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Nov20.231439.6543@kth.se>, hsilva@kth.se (Hugo Silva) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Mathieu Ramírez *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0