From mlarsson@stanford.edu Wed May 03 02:54:06 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!mlarsson From: mlarsson@stanford.edu (Matthias Larsson) Newsgroups: comp.dsp Subject: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May03.025406.2977@stanford.edu> Date: Wed, 03 May 1995 02:54:06 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. 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. -- Matthias Larsson "The carrier frequency does not drift by accident." Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From bmuller@hanse.de Thu May 04 19:09:06 1995 Path: ashpoly!cascade!brgate!saturno!hanse!bmuller From: bmuller@hanse.de (Bastien Müller) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May04.190906.4745@hanse.de> Date: Thu, 04 May 1995 19:09:06 GMT References: <1995May03.025406.2977@stanford.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May03.025406.2977@stanford.edu>, mlarsson@stanford.edu (Matthias Larsson) writes: > 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. Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Bastien Müller SupraFAXModem 28.8 @ 9600 Telebit bps "The hatch is open. Is anyone listening?" From hivanov@cmu.edu Fri May 05 23:12:06 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!hivanov From: hivanov@cmu.edu (Hana Ivanov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May05.231206.1912@cmu.edu> Date: Fri, 05 May 1995 23:12:06 GMT References: <1995May03.025406.2977@stanford.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May03.025406.2977@stanford.edu>, mlarsson@stanford.edu (Matthias Larsson) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Hana Ivanov | hivanov@cmu.edu PGP Key fingerprint: F265 51D8 788F BC5F "Keep the channels open." From mkim@ox.ac.uk Sat May 06 21:06:06 1995 Path: ashpoly!cascade!bigsur!ox!mkim From: mkim@ox.ac.uk (Morag Kim) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May06.210606.2433@ox.ac.uk> Date: Sat, 06 May 1995 21:06:06 GMT References: <1995May03.025406.2977@stanford.edu> <1995May04.190906.4745@hanse.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May04.190906.4745@hanse.de>, bmuller@hanse.de (Bastien Müller) 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. -- Morag Kim SupraFAXModem 28.8 @ 33,600 bps "There are 14 nodes and only 10 countries. Count again." From nmuller@netcom.com Mon May 08 10:44:06 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!nmuller From: nmuller@netcom.com (Natalia Müller) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May08.104406.6471@netcom.com> Date: Mon, 08 May 1995 10:44:06 GMT References: <1995May03.025406.2977@stanford.edu> <1995May04.190906.4745@hanse.de> <1995May06.210606.2433@ox.ac.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May06.210606.2433@ox.ac.uk>, mkim@ox.ac.uk (Morag Kim) 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. -- === Natalia Müller === Dept of Electrical Engineering, NETCOM On-Line Communication Services "We don't sign stars. We build them."