In article <(E-Mail Removed)>,

MRAB <(E-Mail Removed)> wrote:

>On 10/09/2012 20:39, Wanderer wrote:

>>

>> I have an array generated by audiolab of left and right stereo

>> channels. It looks like [[1,1],[1,2],[2,3]]. I would like to combine

>> the left and right channels to get an array [2,3,5]. Is there a numpy

>> command to do that?

>

>>>> import numpy

>>>> numpy.array([[1,1],[1,2],[2,3]], dtype="i")

>array([[1, 1],

> [1, 2],

> [2, 3]])

>>>> a[:, 0]

>array([1, 1, 2])

>>>> a[:, 1]

>array([1, 2, 3])

>>>> a[:, 0] + a[:, 1]

>array([2, 3, 5])

>

>But should they be added together to make mono?

>

>Suppose, for example, that both channels have a maximum value. Their

>sum would be _twice_ the maximum.

>

>Therefore, I think that it should probably be the average.

>

> >>> (a[:, 0] + a[:, 1]) / 2

>array([1, 1, 2])
I'd actually think it should be the max. Consider a stereo where one

side is playing a booming bass while the other side is playing a rest

note -- should the mono combination be half as loud as as the bass?

--

Aahz ((E-Mail Removed)) <*>

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