--- In [email protected], "gerard" <[EMAIL PROTECTED]>
wrote:
> The 96kHz sampling does not work properly with my sound card,
> there is a kind of modulating hum and the audio is not so good
> as it is using 48kHz.My sound card is a VIA AC97.
Hello Gerard,
some AC'97 chipsets (mine included, but I have two other sound
cards) support 96 kHz only nominally, in the sense that they accept to
be open for input or for output at 96 kHz sampling rate, but examining
the spectrum, it is possible to see that the anti-aliasing filter of
the card is not changed, it still cuts at 24 kHz, as if the sampling
rate were 48 kHz. Also the noise level in those conditions is higher.
My advice is to get a good sound card and leave the mainboard chipset
to Windows for its noises (bells, whistles, gongs and jingles...) .
> The other topics concerns the transmit side of the software....
> Do you plan to implement something using the sound card as a
> mike input to deliver I and Q signals ?
Yes, I will, but not with SDRadio. The Tx function will eventually be
in the new software being written now. But first I have to complete
the Rx part.
73 Alberto I2PHD
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