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

[Marcus D. Leech]

On 01/15/2015 01:15 AM, Ralph A. Schmid, dk5ras wrote:
> Only 44100 works, giving a clear dial tone. As DSD has fixed sampling rate 8k, 
> a resampler should do the trick. Things could be so easy :) I hate this audio 
> stuff...
>
> Ralph.
If you use "plughw:0,0" as the hardware designator, it's often willing 
to do resampling to the actual hardware rate.

> -----Original Message-----
> From: Marcus D. Leech [mailto:address@hidden
> Sent: Thursday, January 15, 2015 06:41
> To: Ralph A. Schmid, dk5ras; 'Tom Rondeau'
> Cc: 'GNURadio Discussion List'
> Subject: Re: [Discuss-gnuradio] First time user - fm radio tutorial has choppy 
> audio
>
> 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