Rockbox mail archiveSubject: Re: Stereo separation
Re: Stereo separation
Date: Wed, 19 Nov 2003 14:16:25 +0100
Some amount of the inverted signal from the other channel.
If my memory is not totally messed up, it must be like this:
(L is original left signal, R is original right signal)
Signal Left Right
Mono 0.5*(L+R) 0.5*(L+R)
Normal L R
Variable k*L+(1-k)*R (1-k)*L+k*R
with 0.5< k <1 (mono is k=0.5 and normal is k=1)
but if you go over one with k, you see negative amounts of the other
channel. If L=R (mono source) then nothing changes.
At 13:43 19.11.2003, you wrote:
>I have just one question concerning this issue: what difference would I
>hear/see on a scope if the stereo separation was wider (e.g. with the two
>different frequencies on left and right)? (I'm not so firm in audio
> >3) I generated a mp3 with a 500Hz sine on the left channel and a 1kHz sine
> >on the right (and vice versa) and tested it with both firmwares and an
> >oscilloscope (flat settings). There's no measureable difference, any stereo
> >separation issues would have been visible in the waveform.
Received on 2003-11-19