Re: [Discuss-gnuradio] First time user - fm radio tutorial has choppy audio

[Marcus D. Leech]

On 01/15/2015 12:29 AM, Ralph A. Schmid, dk5ras wrote:
> > One could just try dial_tone.py example.  That will exercise the audio 
> > subsystem.
> Output is some garbled noise, and
>
> python$ python dial_tone.py
> INFO: Audio sink arch: alsa
> aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
>
> So my audio stuff is defective, good to know :)
>
> > For alsa, in the device field in the audio sink, try something like
> > hw:0,0  or plughw:0,0
> Seems to be alsa already...hmm...so this comes later.
>
> Ralph.
It may just be that your audio-subsystem doesn't actually support the 
sample-rate that the graph is configuring it for.

Here's the --help for dial_tone.py

Usage: dial_tone.py [options]

Options:
  -h, --help            show this help message and exit
  -O AUDIO_OUTPUT, --audio-output=AUDIO_OUTPUT
                        pcm output device name.  E.g., hw:0,0 or /dev/dsp
  -r SAMPLE_RATE, --sample-rate=SAMPLE_RATE
                        set sample rate to RATE (48000)



Looks like the default is 48e3

Try other rates, like 44.1e3  or 32e3