Eradicatore
Posts: 23
Joined: Sun Jul 29, 2012 1:21 am

Setting the 3.5mm Analog Audio Out to Stereo?

Sun Aug 19, 2012 9:27 pm

Hi,
Does anyone know how to set the headset 3.5mm audio out to Stereo? I followed the help here http://blog.ziade.org/2012/07/01/a-rasp ... ox-how-to/ to get audio working, and then found out how to control volume with amixer.

So then when I type amixer I get this:


[email protected]:/home/jdeltoft# amixer
Simple mixer control 'PCM',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback -10239 - 400
Mono: Playback -1200 [85%] [-12.00dB] [on]



I'm wondering, the "Playback channels" shows Mono. Can that even support Stereo??

Also, what is pswitch and penum and pvolume??

Thanks for any help!

ghans
Posts: 7882
Joined: Mon Dec 12, 2011 8:30 pm
Location: Germany

Re: Setting the 3.5mm Analog Audio Out to Stereo?

Sun Aug 19, 2012 10:22 pm

It is mono only.
AFAIK , the whole analog audio uses the worlds simplest
circuitry and works to 90 % through software. If you want good sound , use HDMI.
There are other methods , just search around.

ghans
Last edited by ghans on Sun Aug 19, 2012 10:23 pm, edited 1 time in total.
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dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5414
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Setting the 3.5mm Analog Audio Out to Stereo?

Sun Aug 19, 2012 10:23 pm

ghans wrote:It is mono only.
No, it is stereo.

Eradicatore
Posts: 23
Joined: Sun Jul 29, 2012 1:21 am

Re: Setting the 3.5mm Analog Audio Out to Stereo?

Mon Aug 20, 2012 2:18 am

dom wrote:
ghans wrote:It is mono only.
No, it is stereo.
Do you mean stereo plug? Or do you mean I can actually play Left and Right audio out the 3.5mm jack? Do you know how to setup PCM to be stereo?

Eradicatore
Posts: 23
Joined: Sun Jul 29, 2012 1:21 am

Re: Setting the 3.5mm Analog Audio Out to Stereo?

Mon Aug 20, 2012 3:02 am

Well, I guess don't believe everything your read. I just downloaded left.mp3 and right.mp3 from here, and played them.

http://www.richardfarrar.com/are-your-s ... correctly/

They work perfectly as they should. So the amixer details on PCM I guess is just lying or just very confusing with what it's trying to describe?

tomaz
Posts: 38
Joined: Thu Jul 12, 2012 9:08 am

Re: Setting the 3.5mm Analog Audio Out to Stereo?

Mon Aug 20, 2012 3:16 am

Hi Eradicatore,
I have made same experiment with some other stereo .mp3 before seeing your post and it is true. It is working stereo but not showing as stereo. Currently you can not control volume separately just left or just right channel.

I have tested my new USB sound card and it is showing stereo. link

Tomaz.
Eradicatore wrote:Well, I guess don't believe everything your read. I just downloaded left.mp3 and right.mp3 from here, and played them.

http://www.richardfarrar.com/are-your-s ... correctly/

They work perfectly as they should. So the amixer details on PCM I guess is just lying or just very confusing with what it's trying to describe?

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