It's been my experience that Soundcards replaying .WAV files can usually
cope with any sampling rate above 5513Hz, although the resultant
frequency generated may not be very accurate. The speeded up ones I
tried were at 6250Hz
One way to test, is to use a hex editor to access the header information
in a .WAV file and just change the value of sampling rate, then see how
well it can be replayed.
Andy G4JNT
----------
From: Alberto di Bene[SMTP:[email protected]]
Reply To: [email protected]
Sent: 2000-06-05 13:22
To: [email protected]
Subject: Re: LF: a really weak signal in Canada....
Larry Kayser wrote:
> Greetings:
>
> Quote
> I don't know if this has been tried before, but I just tried it and
it
> worked nicely.
> [snip]
> I recorded some 578 seconds of audio to hard disk at 7200 samples
per sec.
> [snip]
Seems really a good idea, which could attract also the
die-hard CW-must-be-copied-by-ears crop around.
Just one simple question : why 7200 samples/sec ? It is not a standard
sound card sampling rate. Is there a specific reason for this sampling
speed ?
Perhaps Bill was using an external A/D converter. For the technique to
become widespread and accepted by many (all), it shouldn't rely on an
ad-hoc hardware. Modern sound cards have superb A/D converters,
so why not use them ?
73,
Alberto I2PHD
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