转换一个8位PCM到16位PCM [英] Converting a 8 bit PCM to 16 bit PCM

问题描述

这个问题我是为了了解如何去交织一个16位PCM数据的左和右声道。

Starting from this question I was made to understand how to deinterleave the left and right channel of a 16 bit PCM data.

我现在的问题是，如何将一个8比特PCM去交织被和延伸到一个16位值

My question now is, how will a 8 bit PCM be deinterleaved and "stretched" into a 16 bit value

推荐答案

16位PCM基本上对至少显著位侧相同的数据位和附加位指定值，并添加准确性和细节。随后的8位PCM是通常无符号的价值与的中心点0x80的，和16位（也适用于更高bitnesses）的PCM符号整数，所以换算公式是：

16-bit PCM has basically the same data bits and additional bits on the least significant bit side to specify the value and add accuracy and detail. Then 8-bit PCM is typically unsigned value with a centerpoint of 0x80, and 16-bit (also applicable to higher bitnesses) PCM is signed integer, so the conversion formula is:

UINT8 sample8 = ...;
INT16 sample16 = (INT16) (sample8 - 0x80) << 8;

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