如何混合两个音频通道？

Question

I have two mono audio channels (pcm format) of audio call, incoming and outgoing. how to mix them? how to position them in space? (eg incoming channel sounds slightly on the left and outgoing on the right)

Answer 1

Mixing is just a weighted addition of both signals. So if you want them to be equal in one mono signal, lower both signals by a factor of 2 and add them. If you want to position them in the stereo space, use different weighting on the left and right channel. For example 0.6 of signal 1 and 0.4 of signal 2 on the left channel and vice versa on the right channel will do the trick. For better results, a slight timeshift would be necessary, but that depends on your needs.

Answer 2

立体声 PCM 只是左右交错，首先是左声道一个样本的所有字节，然后是右声道一个样本的所有字节。