From fduarte@panix.com Sun May 01 20:20:34 1994 Path: ashpoly!cascade!bigsur!panix!fduarte From: fduarte@panix.com (Freya Duarte) Newsgroups: comp.dsp Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994May01.202034.9157@panix.com> Date: Sun, 01 May 1994 20:20:34 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 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. However, when downsampling from 44.1 kHz to 64 Hz, accumulator overflow in the biquad IIR filter can destabilize the loop. Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip? -- Freya Duarte "Tape doesn't lie at 02:14. Ears do." Mac IIci / 68882 FPU / AmigaOS 3.1 From ggarcia@demon.co.uk Tue May 03 14:15:34 1994 Path: ashpoly!cascade!mxgate!coyoacan!demon!ggarcia From: ggarcia@demon.co.uk (Graham García) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994May03.141534.5559@demon.co.uk> Date: Tue, 03 May 1994 14:15:34 GMT References: <1994May01.202034.9157@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994May01.202034.9157@panix.com>, fduarte@panix.com (Freya Duarte) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Graham García *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From bgirard@stanford.edu Wed May 04 20:22:34 1994 Path: ashpoly!cascade!mxgate!coyoacan!stanford!bgirard From: bgirard@stanford.edu (Bill Girard) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994May04.202234.4100@stanford.edu> Date: Wed, 04 May 1994 20:22:34 GMT References: <1994May01.202034.9157@panix.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994May01.202034.9157@panix.com>, fduarte@panix.com (Freya Duarte) 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. -- Bill Girard Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From boliveira@mindspring.com Fri May 06 06:56:34 1994 Path: ashpoly!cascade!bigsur!mindspring!boliveira From: boliveira@mindspring.com (Brian Oliveira) Newsgroups: comp.dsp Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994May06.065634.8963@mindspring.com> Date: Fri, 06 May 1994 06:56:34 GMT References: <1994May01.202034.9157@panix.com> <1994May03.141534.5559@demon.co.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994May03.141534.5559@demon.co.uk>, ggarcia@demon.co.uk (Graham García) writes: > Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Brian Oliveira Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------