From landersson@pacbell.net Fri Jun 07 08:51:17 1996
Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!landersson
From: landersson@pacbell.net (Lars Andersson)
Newsgroups: comp.dsp
Subject: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Jun07.085117.3277@pacbell.net>
Date: Fri, 07 Jun 1996 08:51:17 GMT
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Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

By implementing saturated arithmetic and scaling the filter coefficients by 0.5, the loop runs in 18 instruction cycles per sample.
The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead.

Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip?

-- 
Lars Andersson | landersson@pacbell.net
PGP Key fingerprint: 142F CE85 C1DF B747
"Keep the channels open."

From tkang@kiae.su Sun Jun 09 01:31:17 1996
Path: ashpoly!cascade!transat!ukc!fennimore!kiae!tkang
From: tkang@kiae.su (Thiago Kang)
Newsgroups: comp.dsp
Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Jun09.013117.4111@kiae.su>
Date: Sun, 09 Jun 1996 01:31:17 GMT
References: <1996Jun07.085117.3277@pacbell.net>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Jun07.085117.3277@pacbell.net>, landersson@pacbell.net (Lars Andersson) writes:
> Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

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).

-- 
Thiago Kang
Tape trading list upon request. SASE required for international mail.

From rlarsson@unam.mx Mon Jun 10 05:47:17 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!unam!rlarsson
From: rlarsson@unam.mx (Raj Larsson)
Newsgroups: comp.dsp
Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Jun10.054717.5218@unam.mx>
Date: Mon, 10 Jun 1996 05:47:17 GMT
References: <1996Jun07.085117.3277@pacbell.net> <1996Jun09.013117.4111@kiae.su>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1996Jun09.013117.4111@kiae.su>, tkang@kiae.su (Thiago Kang) writes:
> 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).

Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in.

-- 
Raj Larsson
Tape trading list upon request. SASE required for international mail.

From fdubois@mindspring.com Wed Jun 12 04:51:17 1996
Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!fdubois
From: fdubois@mindspring.com (Fiona Dubois)
Newsgroups: comp.dsp
Subject: Re: [FLAME] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Jun12.045117.6728@mindspring.com>
Date: Wed, 12 Jun 1996 04:51:17 GMT
References: <1996Jun07.085117.3277@pacbell.net>
Organization: MindSpring Enterprises
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In article <1996Jun07.085117.3277@pacbell.net>, landersson@pacbell.net (Lars Andersson) writes:
> Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.
> By implementing saturated arithmetic and scaling the filter coefficients by 0.5, the loop runs in 18 instruction cycles per sample.

Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Fiona Dubois
Opinions expressed are solely my own and not those of MindSpring Enterprises.
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