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 <[email protected]> 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 extremely useful, as they have allowed me to implement
> quasi-realtime audio processing in QuickBasic, my favourite but
> super-ancient programming language. There is an option for downconversion
> 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 in a
> phase-continuous manner by DOS commands
>
> Best 73,
> Markus (DF6NM)
>
>
> From: Andy Talbot
> Sent: Sunday, May 06, 2012 6:14 PM
> To: [email protected]
> 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. Then the decoding software works on the resulting .WAV
> files. It won't be real time any more, but none of these slow data
> modes actually are that real time. 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. 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
>
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