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

[Fernando]

Done.
https://github.com/gnuradio/gnuradio/issues/1314

regards


On 17/05/17 14:25, Marcus Müller wrote:
> Hm, I'd call that a bug. Throttle should *not* change the behaviour of a
> system. and especially, it should *not* be required in a hardware
> rate-limited flow graph.
>
> Would you be as nice as to open a bug on
> https://github.com/gnuradio/gnuradio/issues ? I'd like to keep track of
> this.
>
> Best regards,
>
> Marcus
>
>
> On 17.05.2017 14:18, Fernando wrote:
>> 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
>>
>>
>>
>>
>>
>>
>>
>>
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