From tlindqvist@ox.ac.uk Tue Feb 07 07:05:10 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!tlindqvist
From: tlindqvist@ox.ac.uk (Takeshi Lindqvist)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb07.070510.2587@ox.ac.uk>
Date: Tue, 07 Feb 1995 07:05:10 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
Takeshi Lindqvist | tlindqvist@ox.ac.uk
PGP Key fingerprint: 7464 4E10 56DB 8D75
"Keep the channels open."

From gkuznetsov@tum.de Wed Feb 08 17:38:10 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!gkuznetsov
From: gkuznetsov@tum.de (Göran Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb08.173810.4827@tum.de>
Date: Wed, 08 Feb 1995 17:38:10 GMT
References: <1995Feb07.070510.2587@ox.ac.uk>
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In article <1995Feb07.070510.2587@ox.ac.uk>, tlindqvist@ox.ac.uk (Takeshi Lindqvist) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Göran Kuznetsov -- Technische Universität München
"Extraordinary claims require extraordinary spectra."

From blee@titech.ac.jp Fri Feb 10 00:30:10 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!blee
From: blee@titech.ac.jp (Bill Lee)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb10.003010.7318@titech.ac.jp>
Date: Fri, 10 Feb 1995 00:30:10 GMT
References: <1995Feb07.070510.2587@ox.ac.uk>
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In article <1995Feb07.070510.2587@ox.ac.uk>, tlindqvist@ox.ac.uk (Takeshi Lindqvist) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Bill Lee
Tape trading list upon request. SASE required for international mail.

From mmartinez@unam.mx Sat Feb 11 01:35:10 1995
Path: ashpoly!cascade!mxgate!coyoacan!unam!mmartinez
From: mmartinez@unam.mx (Marta Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb11.013510.8073@unam.mx>
Date: Sat, 11 Feb 1995 01:35:10 GMT
References: <1995Feb07.070510.2587@ox.ac.uk> <1995Feb10.003010.7318@titech.ac.jp>
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In article <1995Feb10.003010.7318@titech.ac.jp>, blee@titech.ac.jp (Bill Lee) writes:
> Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Marta Martínez | mmartinez@unam.mx
PGP Key fingerprint: D8C7 98EB 8974 EFBB
"Keep the channels open."