From cnilsson@delphi.com Thu Mar 10 10:11:36 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!cnilsson From: cnilsson@delphi.com (Camila Nilsson) Newsgroups: comp.dsp Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Mar10.101136.4865@delphi.com> Date: Thu, 10 Mar 1994 10:11:36 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. 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. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Camila Nilsson "When every node is whole, the channel opens." Amiga 1200 (Blizzard 030/50) / FreeBSD 2.1 From mandersson@mindspring.com Thu Mar 10 11:09:36 1994 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!mandersson From: mandersson@mindspring.com (Mateo Andersson) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Mar10.110936.5120@mindspring.com> Date: Thu, 10 Mar 1994 11:09:36 GMT References: <1994Mar10.101136.4865@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar10.101136.4865@delphi.com>, cnilsson@delphi.com (Camila Nilsson) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Mateo Andersson Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From mpetrov@panix.com Fri Mar 11 23:13:36 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!mpetrov From: mpetrov@panix.com (Marta Petrov) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Mar11.231336.5187@panix.com> Date: Fri, 11 Mar 1994 23:13:36 GMT References: <1994Mar10.101136.4865@delphi.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Mar10.101136.4865@delphi.com>, cnilsson@delphi.com (Camila Nilsson) writes: > Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- Marta Petrov "The hatch is open. Is anyone listening?" Atari TT030 / TOS 4.04 From dgarcia@stanford.edu Sun Mar 13 02:46:36 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!dgarcia From: dgarcia@stanford.edu (Dmitri García) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Mar13.024636.1350@stanford.edu> Date: Sun, 13 Mar 1994 02:46:36 GMT References: <1994Mar10.101136.4865@delphi.com> <1994Mar11.231336.5187@panix.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Mar11.231336.5187@panix.com>, mpetrov@panix.com (Marta Petrov) 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. -- Dmitri García -- Stanford University Computer Systems Lab "Measuring a record you own is listening, not piracy." From dweber@titech.ac.jp Tue Mar 15 03:06:36 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!dweber From: dweber@titech.ac.jp (Dong-hyun Weber) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Mar15.030636.6869@titech.ac.jp> Date: Tue, 15 Mar 1994 03:06:36 GMT References: <1994Mar10.101136.4865@delphi.com> <1994Mar11.231336.5187@panix.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Mar11.231336.5187@panix.com>, mpetrov@panix.com (Marta Petrov) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Dong-hyun Weber Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------