audio channel cutting out after close to 7min

isaac

Hi all,

i was rehearsing with the Bela and i was losing an audio on the right channel and some times losing it in both. So today i tested it with a simple sine-tone program one sending a different sine-tone to each channel.

after 4 tests the same thing happens

  at 2m 09s  the audio changes get higher in pitch.

  at 6m 55s the right channel fades out.

   after 30m the left channel nothing seemed to change in the left channel

Does any one have any idea whats happening?

Thanks very much

isaac

this is the Bela mini
if that changes anything

giuliomoro

Can younpodr the code you've been using, or - better - use the example Fundamentals/sinetone for your tests?

isaac

here is the code i used :

#include <Bela.h>
 #include <cmath>

 float gFrequency = 440.0;
 float gPhase;
 float gFrequency2 = 660.0;
 float gPhase2;
 float gInverseSampleRate;

 bool setup(BelaContext *context, void *userData)
 {
	gInverseSampleRate = 1.0 / context->audioSampleRate;
	gPhase = 0.0;

	return true;
 }

   void render(BelaContext *context, void *userData)
    {
         for(unsigned int n = 0; n < context->audioFrames; n++) {
                 float out[2]= {0}; 
                 out[0]= 0.8f * sinf(gPhase);
                 gPhase += 2.0f * (float)M_PI * gFrequency * gInverseSampleRate;
                 out[1] = 0.8f * sinf(gPhase2);
                 gPhase2 += 2.0f * (float)M_PI * gFrequency2 * gInverseSampleRate;
		if(gPhase > M_PI)
			gPhase -= 2.0f * (float)M_PI;

		for(unsigned int channel = 0; channel < context->audioOutChannels; channel++) {
			audioWrite(context, n, channel, out[channel]);
                  }
          }
   }

 void cleanup(BelaContext *context, void *userData)
 {

 }

isaac

hi
above is what i was using it is basically the Fundamentals/sinetone but with an added sintone for the other channel

giuliomoro

Yup you are not wrapping around gPhase2 which is what is causing the disruptions you are observing. You need

if(gPhase2 > M_PI)
			gPhase2 -= 2.0f * (float)M_PI;

isaac

Oh thanks! silly mistake on my part !
I though it was odd and different to the problem i had during my rehearsal.
thanks again 🙂
Now I can go back to testing wither my transmitters are causing the audio drop out I had during rehearsal.