From pweber@rwth-aachen.de Sat Nov 04 16:20:58 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!pweber
From: pweber@rwth-aachen.de (Pavel Weber)
Newsgroups: comp.dsp
Subject: stardust.c v1.3 - Costas loop stability & phase lock under Linux
Message-ID: <1995Nov04.162058.1677@rwth-aachen.de>
Date: Sat, 04 Nov 1995 16:20:58 GMT
Organization: RWTH Aachen Informatik
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Notes on porting stardust.c to GCC on Linux 1.2 and optimizing the inner filter loops.

The original stardust.c v1.0 dropped sync whenever there was a scratch or surface pop on the record.
Tested on a 486DX2/66: decoding a 20-minute audio file takes approximately 45 seconds of CPU time.

Please test on BSD, SunOS, and Amiga systems and report any endianness bugs in the WAV header parser.

-- 
=== Pavel Weber ===
Dept of Electrical Engineering, RWTH Aachen Informatik
"In theory there is no difference between theory and practice."

From tlee@unam.mx Mon Nov 06 09:24:58 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!unam!tlee
From: tlee@unam.mx (Tobias Lee)
Newsgroups: comp.dsp
Subject: Re: stardust.c v1.3 - Costas loop stability & phase lock under Linux
Message-ID: <1995Nov06.092458.3073@unam.mx>
Date: Mon, 06 Nov 1995 09:24:58 GMT
References: <1995Nov04.162058.1677@rwth-aachen.de>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Nov04.162058.1677@rwth-aachen.de>, pweber@rwth-aachen.de (Pavel Weber) writes:
> Notes on porting stardust.c to GCC on Linux 1.2 and optimizing the inner filter loops.

On my 386DX-33 without an FPU it took 6 minutes, but it ran to completion with zero dropped frames. Great work!

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-- 
Tobias Lee -- Universidad Nacional Autónoma de México (DGSCA)
"Extraordinary claims require extraordinary spectra."

From cpetrov@pacbell.net Mon Nov 06 11:25:58 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!cpetrov
From: cpetrov@pacbell.net (Camila Petrov)
Newsgroups: comp.dsp
Subject: Re: stardust.c v1.3 - Costas loop stability & phase lock under Linux
Message-ID: <1995Nov06.112558.5986@pacbell.net>
Date: Mon, 06 Nov 1995 11:25:58 GMT
References: <1995Nov04.162058.1677@rwth-aachen.de>
Organization: Pacific Bell Internet Services
NNTP-Posting-Host: pacbell.net
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Lines: 11

In article <1995Nov04.162058.1677@rwth-aachen.de>, pweber@rwth-aachen.de (Pavel Weber) writes:
> Notes on porting stardust.c to GCC on Linux 1.2 and optimizing the inner filter loops.

Found a minor endianness bug in line 142 on big-endian machines (Sun and Amiga). Replace ntohl with custom byte swap macro.

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
=== Camila Petrov ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"The hatch is open. Is anyone listening?"