[EMAIL PROTECTED] wrote:
>
> Timothy Stockman wrote,
>
> | L+R/2 is almost universally used. FM broadcast is trasmitted this way for
> | compatibility with monaural receivers. The "mono" switch on preamplifiers
> | does this. However, this simple, almost universally used transformation
> | does not provide a perfect mono version of a stereo source.
>
> If that is not "perfect," then there must be some definition of perfection
> here.
>
You have to think complex.... (you're dealing with signals that change in the
time-domain. Thus each number has two values. This can be an amplitude with
a phase, or an amplitude with a time. Thus we need to resort to complex
numbers....
I'll have to look up which algorithm should be used to get a monoraul signal
by combining two signals without loosing to much information.
Example, take two almost identical signals, add them with a simple adder. If
one of them is 'laging behind' and thus out of phase, you'll get (using (L+R)/2
)
almost nothing.... However if you use (L^2+R^2)^0.5, you will get some sort
of average. And please note, you're working with complex numbers here, so all
amplitude and phase information is kept....
Cheers,
Ralph -> hoping to be helpfull
--
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Ralph Smeets Functional Verification Centre Of Competence - CMG
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