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Altera_Forum's avatar
Altera_Forum
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10 years ago

I get a big noise when I echo the audio data from microphone

I designed a audio system in Qsys. I read the fifo data from the microphone input and write it to the audio write fifo. Although I can hear the microphone echo, it also generate a very big noise. I c...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

I can now generate a simple sine wave signal by a lookup table and send it to the line out now. I can hear very clear sound from the earphone. Thus I think the problem is not in the output. How should I send the sine signal to the input?

Here is the code to test the output. 


for(n = 0; n<256; n++){
	alt_up_audio_write_fifo (audio_dev, &(sine), 16, ALT_UP_AUDIO_LEFT);
}