From adubois@unam.mx Wed Mar 06 02:03:19 1996 Path: ashpoly!cascade!brgate!saturno!unam!adubois From: adubois@unam.mx (Andrei Dubois) Newsgroups: comp.dsp Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar06.020319.2559@unam.mx> Date: Wed, 06 Mar 1996 02:03:19 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] 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. -- Andrei Dubois "They will send a copy in my place." 486DX2/66 (Linux 1.2.13) / FreeBSD 2.1 From astewart@demon.co.uk Wed Mar 06 05:10:19 1996 Path: ashpoly!cascade!transat!ukc!fennimore!demon!astewart From: astewart@demon.co.uk (Anja Stewart) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar06.051019.4183@demon.co.uk> Date: Wed, 06 Mar 1996 05:10:19 GMT References: <1996Mar06.020319.2559@unam.mx> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Mar06.020319.2559@unam.mx>, adubois@unam.mx (Andrei Dubois) 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. -- Anja Stewart | astewart@demon.co.uk PGP Key fingerprint: 7AAD 4FC7 D520 170F "Keep the channels open." From asanchez@panix.com Wed Mar 06 17:53:19 1996 Path: ashpoly!cascade!mxgate!coyoacan!panix!asanchez From: asanchez@panix.com (Astrid Sánchez) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar06.175319.5383@panix.com> Date: Wed, 06 Mar 1996 17:53:19 GMT References: <1996Mar06.020319.2559@unam.mx> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Mar06.020319.2559@unam.mx>, adubois@unam.mx (Andrei Dubois) 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 Sánchez Tape trading list upon request. SASE required for international mail. From sweber@earthlink.net Thu Mar 07 17:12:19 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!sweber From: sweber@earthlink.net (Sergei Weber) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar07.171219.1512@earthlink.net> Date: Thu, 07 Mar 1996 17:12:19 GMT References: <1996Mar06.020319.2559@unam.mx> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Mar06.020319.2559@unam.mx>, adubois@unam.mx (Andrei Dubois) 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. -- Sergei Weber | sweber@earthlink.net PGP Key fingerprint: 06A1 E748 0991 B80F "Keep the channels open." From rchoi@mit.edu Fri Mar 08 08:55:19 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!rchoi From: rchoi@mit.edu (Renata Choi) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1996Mar08.085519.7160@mit.edu> Date: Fri, 08 Mar 1996 08:55:19 GMT References: <1996Mar06.020319.2559@unam.mx> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar06.020319.2559@unam.mx>, adubois@unam.mx (Andrei Dubois) 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. -- Renata Choi -- Massachusetts Institute of Technology "In theory there is no difference between theory and practice."