Audio with PWM

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It is possible to generate sound with the APF9328 without any sound chip, just by using the PWM output and the i.MXL possibilities:

AudioWithPWM.png

Quality

Achieved sound quality is low (8bits @ 8, 16 or 32KHz) but very sufficient to reproduce voice or small sounds. PWM activation/deactivation is generating "clac" each time you play a sound (for the moment) but using some electronic filters or playing "blank noise" could solve the problem.

Links

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