Re: [Discuss-gnuradio] Audio bandwidth

On Thu, Oct 15, 2015 at 2:04 PM, Hoang Nguyen Tran <address@hidden> wrote:

Hi,
Regarding to this problem, I tried to use UDP sink to replace Audio sink or Wave file sink, then try to receive audio in on another computer with decoding software by VLC.

When I run the VLC with command : vlc --demux=rawaud --rawaud-channels=1 --rawaud-samplerate=48000 udp://@:7355
I was able to here the sound coming from VLC, however, the sound was choppy, the same with audio under-run. Does anyone have explanation for this ?

I set the UDP sink with these parameters:

Payload size :1500
Send NULL Pkt as EOF : True
Vec length : 1

Thanks a lot,
Hoang
On Thu, Oct 15, 2015 at 10:53 AM, Hoang Nguyen Tran <address@hidden> wrote:
Hi Marcus,

I put a variable for that, and usually I put in 24kHz for signal bandwidth in Low Pass filter.
On Thu, Oct 15, 2015 at 10:46 AM, Marcus Müller <address@hidden> wrote:
Hi Hoang,

are you sure you want to reduce the FM signal bandwidth to 6kHz in the Low Pass filter?

Best regards,
Marcus

On 10/15/2015 04:38 PM, Hoang Nguyen Tran wrote:
Hi Tom,

Thank for replying, Below is my narrow band fm receiver base on nbfm rx from http://www.oz9aec.net/

I was able to receive and decode with ISS and other sat with 1200 baud rate, but did not success with 9600 baud rate.

On Thu, Oct 15, 2015 at 10:11 AM, Tom Rondeau <address@hidden> wrote:

On Wed, Oct 14, 2015 at 2:47 PM, Hoang Nguyen Tran <address@hidden> wrote:

Hi all,

I have question related to audio bandwidth cutoff.

Yesterday, I received very good signal from STRaND satellite 9600 bps, FSK modulation.

I used audio sink to record the signal then used it for decoding.

However, I was unable to decode signal, then I ask some another ham radio expert and he said because of my audio bandwidth cut off for some unknown reason is 3000 so it is unable to decode.

Do anyone know why and how can I change the audio bandwidth cut off ?

I used the normal WAV file sink with set up: sample rate 48000, N channels : 1 and Bít per sample 16.

Thank for your time and I appreciate any comment.

Best regards,

Hoang

Hoang,

It's nearly impossible to help you here since you've given us no information on your setup. Yes, sample rates and filter bandwidths matter in this. You've likely got some numbers in your flowgraph wrong.

Tom

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From:	Hoang Nguyen Tran
Subject:	Re: [Discuss-gnuradio] Audio bandwidth
Date:	Fri, 16 Oct 2015 12:29:11 -0400