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static snd_pcm_format_t format = SND_PCM_FORMAT_S16;	/* sample format */
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static snd_pcm_format_t format = SND_PCM_FORMAT_S16;	/* sample format */
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static unsigned int rate = 44100;			/* stream rate */
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static unsigned int rate = 44100;			/* stream rate */
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static unsigned int channels = 1;			/* count of channels */
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static unsigned int channels = 1;			/* count of channels */
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static unsigned int buffer_time = 500000;		/* ring buffer length in us */
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static unsigned int buffer_time = 500000;		/* ring buffer length in us */
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static unsigned int period_time = 100000;		/* period time in us */
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static unsigned int period_time = 100000;		/* period time in us */
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static double freq = 440;				/* sinusoidal wave frequency in Hz */
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static int verbose = 0;					/* verbose flag */
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static int verbose = 0;					/* verbose flag */
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static int resample = 1;				/* enable alsa-lib resampling */
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static int resample = 1;				/* enable alsa-lib resampling */
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static int period_event = 0;				/* produce poll event after each period */
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static int period_event = 0;				/* produce poll event after each period */
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#define SOUND_SPEED	340
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unsigned int chirp_size;
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unsigned int chirp_size;
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int period=0;
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int period=0;
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int cperiod=0;
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int cperiod=0;
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int chirp[100000];
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int chirp[100000];
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	out=fopen("./output.txt","w");
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	out=fopen("./output.txt","w");
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	for(i=0;i<=100000;i++) fprintf(out,"%6d	%6d %6d \n",i,chirp[i],signal[i]);
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	for(i=0;i<=100000;i++) fprintf(out,"%6d	%6d %6d \n",i,chirp[i],signal[i]);
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	fclose(out);
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	fclose(out);
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#define SIGNAL_SAMPLES 100000
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#define SIGNAL_SAMPLES 100000
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#define SAMPLES  1000
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   for(n=0; n < (SIGNAL_SAMPLES - SAMPLES);n++){			//spocita korelaci pro mozna spozdeni
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	for(n=0; n < (SIGNAL_SAMPLES - chirp_size);n++){			//spocita korelaci pro mozna spozdeni
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     r=0;
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	  r=0;
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     for(m=0;m < SAMPLES;m++) r += chirp[m]*signal[m+n];
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	  for(m=0;m < 1000;m++) r += chirp[m]*signal[m+n];
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     correlation[n]=r;
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	  correlation[n]=r;
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   }
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	}
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   r=0;
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	r=0;
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   for(n=0; n < (SIGNAL_SAMPLES - SAMPLES);n++){			//najde nejvetsi shodu (pro nazornost v samostatnem cyklu)
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	for(n=0; n < (SIGNAL_SAMPLES - chirp_size);n++){			//najde nejvetsi shodu (pro nazornost v samostatnem cyklu)
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     if (r < correlation[n]){
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	  if (r < correlation[n]){
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       delay = n;
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	  delay = n;
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       r = correlation[n];
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	  r = correlation[n];
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     }
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	  }
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   }
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	}
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	printf("\nEcho zacina na: %d vzorku.\n", delay);
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	printf("\nEcho zacina na: %d vzorku.\n", delay);
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	printf("\nCasove na: %ds", delay);
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	printf("Casove na: %f s\n", ((float)delay/rate));
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	printf("vzdalenost: %f m\n", (SOUND_SPEED*(float)delay/rate));
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	snd_pcm_close(playback_handle);
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	snd_pcm_close(playback_handle);
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	snd_pcm_close(capture_handle);
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	snd_pcm_close(capture_handle);
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	return 0;
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	return 0;
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}
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}