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

[Marcus Müller]

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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