Audio Recording using the " Wide - U " mode.

Jeremy
Posts: 1
Joined: Mon Jul 25, 2022 9:58 am

Audio Recording using the " Wide - U " mode.

#1

Unread post by Jeremy »

Many thanks for providing such an excellent and useful application.

The DSP mode "Wide-U" is of great use to me. In this mode one may set a bandwidth of up to 48kHz (F0 + - BW/2) and record the resulting signal as a file in *.wav format.

Questions :

1. What is the sample rate of the output file *.wav file ?
The sample rate may be changed as one selects different bandwidths.

2. Can one specify the sample rate ?

Or

3. Is the sample rate fixed at a maximum say 96 kilo samples per sec (ksps)?

Thanks in advance,

Jeremy.

jdow
Posts: 800
Joined: Mon Aug 10, 2020 8:17 pm

Re: Audio Recording using the " Wide - U " mode.

#2

Unread post by jdow »

For best purity of the output for future processing the data rate is not something a user can manipulate easily if at all. It is not likely a power of two multiple of 3 kHz. If it is fed through a resampler there will be a reduction in signal quality; but, programs fed the signal may work just fine. (A PSK decoder or ALE decoder would work quite well - even on the normal SSB reception.) Other decoders might find reasons to not be happy. On the whole I suspect most uses would be happy. Check the widest filter you can create and divide by about 5 or so to get the highest audio sample rate that will be meaningful. (Resampling 48 kHz to 96 kHz will still be about 20 kHz wide for the audio.)
{^_^}

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Simon G4ELI
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Location: Mawnan Smith
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Re: Audio Recording using the " Wide - U " mode.

#3

Unread post by Simon G4ELI »

Jeremy wrote: Mon Jul 25, 2022 10:46 am Many thanks for providing such an excellent and useful application.

The DSP mode "Wide-U" is of great use to me. In this mode one may set a bandwidth of up to 48kHz (F0 + - BW/2) and record the resulting signal as a file in *.wav format.

Questions :

1. What is the sample rate of the output file *.wav file ?
The sample rate may be changed as one selects different bandwidths.

2. Can one specify the sample rate ?

Or

3. Is the sample rate fixed at a maximum say 96 kilo samples per sec (ksps)?

Thanks in advance,

Jeremy.
Audio is recorded at 48kHz, this is fixed.
Simon Brown :shock:
www.sdr-radio.com

Do not send me direct e-mail, thank-you!

jdow
Posts: 800
Joined: Mon Aug 10, 2020 8:17 pm

Re: Audio Recording using the " Wide - U " mode.

#4

Unread post by jdow »

What sample rate range might be the source rate to the resampler? If it's lower than 48 ksps then that lower rate defines the data bandwidth.
{o.o}

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Simon G4ELI
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Joined: Thu Aug 06, 2020 7:27 am
Location: Mawnan Smith
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Re: Audio Recording using the " Wide - U " mode.

#5

Unread post by Simon G4ELI »

Yep,

It'll be 24kHz, same as the maximum filter width.
Simon Brown :shock:
www.sdr-radio.com

Do not send me direct e-mail, thank-you!

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