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Raspberry Pi and Stereo Sound
Posted: Wed Oct 05, 2016 2:04 pm
by mrfarooq
I need some advice. I need to playback in a continuous loop a 15 second audio clip in stereo that is CD quality (44.1k 16 bit). Would Raspberry Pi be suitable for this application? Thanks.
Re: Raspberry Pi and Stereo Sound
Posted: Wed Oct 05, 2016 2:15 pm
by Douglas6
Yes. Perhaps more difficult with the Compute Module, I'm not sure of its audio capabilities.
Re: Raspberry Pi and Stereo Sound
Posted: Wed Oct 05, 2016 4:23 pm
by W. H. Heydt
Pi audio is done with PWM on GPIO pins. Check the documents for fully featured Pi boards (B, A+, B+, Pi2B, Pi3B) to see what GPIO pins are used. Then connect your audio output to them. Or, if you want to improve the audio quality, connect a DAC and feed that the audio in digital form.
Re: Raspberry Pi and Stereo Sound
Posted: Wed Oct 05, 2016 6:35 pm
by fruitoftheloom
Re: Raspberry Pi and Stereo Sound
Posted: Thu Oct 06, 2016 12:04 pm
by karrika
There is also a nice player called omxplayer.
omxplayer -o local --loop sound.mp3
The keyword "local" directs the sound to the GPIO pins you have chosen for audio instead of HDMI.
You may want to create a dt blob with the correct audio pin settings. I have an example at discohat.com/miscap.
Code: Select all
/* Audio */
fragment@5 {
target = <&audio_pins>;
__overlay__ {
brcm,pins = <12 13>;
brcm,function = <4>; /* alt0 */
};
};
Re: Raspberry Pi and Stereo Sound
Posted: Thu Oct 06, 2016 12:08 pm
by gsh
If you use audio_pwm_mode=2 then you'll get CD quality audio out...