Re: [Discuss-gnuradio] GFSK mod/demod does not work OK with wav file

[Fernando]

On 15/05/17 21:57, Cinaed Simson wrote:
> On 05/15/2017 09:50 AM, Fernando wrote:
>> On 15/05/17 05:33, Cinaed Simson wrote:
>>> On 05/14/2017 01:06 PM, Fernando wrote:
>>>> With 8 samples/symbol there was aU and CPU at 94% (I have three AMD
>>>> cores> I have reduced it to 2 s/s as suggested Cinaed, then aU
>>>> dissapear and
>>>> CPU is at 70%, sound is a little better but still intermittent.
>>>> File is sampled at 44100 and with direct connection from wav file source
>>>> to audio sink (everything else disabled) it plays fine
>>> Try turning on the throttle and see what happens.
>>>
>>>
>> it works!!!!!!
>> why????  Should not be limited by the sound card?
>>
>> It report a warning:
>>>>> Warning: This flow graph contains a throttle block and another rate
>> limiting block, e.g. a hardware source or sink. This is usually
>> undesired. Consider removing the throttle block.
>>
>> but it keeps the CPU under 40% and works fine.
>> Even with samples/symbol set to 8 it has go to 95% CPU but it has worked
>> some seconds until it has begun to show aUaU.
>>
>>
>> regards
>>
>>
>>
>>
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> Don't know. But you can't use a re-sampler because you don't know the
> rate flowing into the audio card.
>
> Try setting the sampling rate to 48 kHz, i.e. set the throttle rate to
> 48 kHz, and then under the properties for the audio sink, use the pull
> down menu and set the audio card to 44.1 kHz. And leave the sps set to 8.
>
> If that works, then try disabling the throttle and setting the sampling
> rate of the audio card to 48 Khz - leaving the sps set to 8.
>
> If it doesn't work try setting the sps to 2, no throttle and audio card
> set to 48 KHz.
>
> Use whatever works - but ideally without a throttle.
>

It work both 2samples/symbol and 8s/s but only with the throtle.  (with
8s/s the system is nearly overloaded, 85-90%CPU)
With throtle and 2s/s system is 60-80% CPU but sound is intermittent.
OK, it works although I don't know why.  I'll remember trying a throtle
in other situations if something strange happen

regards