From cpark@kth.se Wed May 03 13:58:30 1995 Path: ashpoly!cascade!brgate!saturno!kth!cpark From: cpark@kth.se (Camila Park) Newsgroups: comp.dsp Subject: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May03.135830.1953@kth.se> Date: Wed, 03 May 1995 13:58:30 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 11 Why fixed-point integer math requires careful scaling when tracking a 14.2 Hz carrier. 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. Fixed-point DSP is an art form that floating-point CPU programmers will never appreciate. -- Camila Park | cpark@kth.se PGP Key fingerprint: 382F 52B0 CB00 A6F0 "Keep the channels open." From landersson@clari.net Thu May 04 00:00:30 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!landersson From: landersson@clari.net (Lucia Andersson) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May04.000030.1946@clari.net> Date: Thu, 04 May 1995 00:00:30 GMT References: <1995May03.135830.1953@kth.se> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May03.135830.1953@kth.se>, cpark@kth.se (Camila Park) writes: > Why fixed-point integer math requires careful scaling when tracking a 14.2 Hz carrier. > This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- Lucia Andersson *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From leriksson@netcom.com Fri May 05 19:41:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!leriksson From: leriksson@netcom.com (Lucia Eriksson) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May05.194130.7480@netcom.com> Date: Fri, 05 May 1995 19:41:30 GMT References: <1995May03.135830.1953@kth.se> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May03.135830.1953@kth.se>, cpark@kth.se (Camila Park) writes: > Why fixed-point integer math requires careful scaling when tracking a 14.2 Hz carrier. > This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- Lucia Eriksson -- NETCOM On-Line Communication Services "Row 14. No joke." From meriksson@illinois.edu Sat May 06 17:22:30 1995 Path: ashpoly!cascade!bigsur!illinois!meriksson From: meriksson@illinois.edu (Marta Eriksson) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May06.172230.2391@illinois.edu> Date: Sat, 06 May 1995 17:22:30 GMT References: <1995May03.135830.1953@kth.se> <1995May05.194130.7480@netcom.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May05.194130.7480@netcom.com>, leriksson@netcom.com (Lucia Eriksson) writes: > Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. Top-posters will be placed in my ~/.killfile without notice. -- Marta Eriksson US Robotics Courier V.34 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From lmartinez@ox.ac.uk Sat May 06 19:12:30 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!lmartinez From: lmartinez@ox.ac.uk (Liam Martínez) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1995May06.191230.9241@ox.ac.uk> Date: Sat, 06 May 1995 19:12:30 GMT References: <1995May03.135830.1953@kth.se> <1995May05.194130.7480@netcom.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May05.194130.7480@netcom.com>, leriksson@netcom.com (Lucia Eriksson) writes: > Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Liam Martínez Zyxel U-1496E @ 19,200 bps "Hold for relay."