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Date: Mon, 7 May 2012 10:41:38 +0100
Message-ID: <CAA8k23SQRuMFDa5c-b8xWw+m5c81FV+ZVsETB=-4AjK894KVyQ@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Generating 8970 Hz carrier... - DL4YHF Audio utilities
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Yes I remember and used that utility a few times.  But it still uses
the soundcard with sync slippage possible.
However, the file format was simple and a custom A/D and software
would substitute transparantly

Andy
G4JNT


On 6 May 2012 17:50, Markus Vester <markusvester@aol.com> wrote:
> Andy, LF,
>
> some time ago, Wolf DL4YHF wrote a pair of sound utilities, SndInput and
> SndOutpt, which create or consume a continuous stream of raw audio files:
>
> http://www.qsl.net/dl4yhf/snd_utl1.html
>
> I have found these=A0extremely useful, as they have allowed me to impleme=
nt
> quasi-realtime audio=A0processing in QuickBasic, my favourite but
> super-ancient programming language. There=A0is an option for downconversi=
on
> and decimation into / from complex IQ data, which greatly enhances
> efficiency for narrowband applications (eg. slow Hell). SndOutpt can also
> generate a sinusoidal test tone, which can be frequency shifted=A0in a
> phase-continuous manner by DOS commands
>
> Best 73,
> Markus (DF6NM)
>
>
> From: Andy Talbot
> Sent: Sunday, May 06, 2012 6:14 PM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Generating 8970 Hz carrier with Spectrum Lab ?
>
> ...
> A custom A/D could send its data in its own format via USB, or serial
> COM port or whatever, to software that saves blocks in the format of a
> .WAV file.=A0 Then the decoding software works on the resulting .WAV
> files.=A0=A0 It won't be real time any more, but none of these slow data
> modes actually are that real time.=A0 The speed of reading and switching
> (using a pair of ping-pong files if necessary) can make the whole
> system pseudo real time - in the same way as WSJT appears to run
> continuously.
>
> Now, any A/D design can be used provided the results are written to a
> .WAV file.=A0=A0 Wav files can have any sample rate (so long as it is an
> integer number of Hz) and do not have to be restricted to 48000, 11025
> or whatever, so custom LF receivers using quite slow A/D converters
> and low sample rates are now valid.
>
> Just throwing that idea into the ring..
>
> Andy
> www.g4jnt.com
>