Hi David and all,
Just realized that I failed to mention that you also need some gain,
because the desired signal is only a tiny fraction of the energy in
your .wav files. You can specify gain in the passband of the filters,
and/or use the Transform->Amplitude->Amplify command as desired.
73,
Stewart KK7KA
Does anyone know of a programme that can produce an audio bandpass filter
from a soundcard?
I'm trying to find something that will allow me to specify a frequency of
interest and to have the DSP remove signals above and below two cut-off
frequencies.
Reason: twofold, 1) I've recently recorded some EME signals from 70cms as
.wav files and I'm trying to recover reasonable audio.
2) It occurs to me that the LF QRSS beacons regularly visible from VO/RU/
etc. are actually very strong and it should be possible to filter and speed up
a
stored QRSS file to something like normal CW........just for fun
Would the new 'filter' incorporated into V2.3 spectrum Lab do this?
Seasons greetings es 73
David G0MRF
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