need help understanding data section of wav file

问题

I was reading THIS TUTORIAL on wav files and I have some confusions.
Suppose I use PCM_16_BIT as my encoding format. So this should mean each of my sound samples need 16 bits to represent them shouldn't it?
But in this tutorial, the second figure shows 4 bytes as one sample. Why is that? I suppose because it is trying to show the format for a stereo recorded wav file, but what if I have a mono recorded wav file? Are the left and right channel values equal in this case, or one of the channel values is 0? How does it work?

回答1:

Yes, for 16bit stereo you need 4 bytes. For mono, you just need two bytes for 16bit PCM. Check this out:

http://www.codeproject.com/Articles/501521/How-to-convert-between-most-audio-formats-in-NET