How to normalize audio input?

2 次查看（过去 30 天）
fei
fei 2013-5-24
回答： Antonio Ferreras 2019-10-22
Hello, does anybody know how wavrecord function scales PCM format (range 0-256 or 0-65536) into -1;1 interval? many thanks for answers

请先登录，再回答此问题。

回答（3 个）

Daniel Shub
Daniel Shub 2013-5-24
The wavrecord function does not do the scaling but rather the recsnd function handles the scaling. The recsnd function is/was not a well defined entity since it was a platform dependent mex file and in some cases it used audiorecorder. The wavrecord function is now obsolete and is slated to be removed, so there is no single version...
That said, (x-128)/128 is probably a reasonable approximation of the conversion. Do you have reason to doubt this?
fei
fei 2013-5-26
Thank you for your answer Daniel, finally I used mapminmax function which uses this algorithm: y = (ymax-ymin)*(x-xmin)/(xmax-xmin) + ymin;
  1 个评论
Jan
Jan 2013-5-26
Please post comments in the comment section of the corresponding answer, not as further answer. Thanks.

请先登录，再进行评论。

Antonio Ferreras
Antonio Ferreras 2019-10-22
The problem con mapminmax is that it introduces a continuus bias

类别

在 Help Center 和 File Exchange 中查找有关 Audio Processing Algorithm Design 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by