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基于MATLAB的AGC示例,可以做為學(xué)習(xí)AGC處理算法的入門

代碼片段和文件信息
/******************************************************************************
**
**?Function?????????????:?AGC()
**
**?Description??????????:?AGC?algorithm?is?used?to?automatically?adjust?the?
**????????????????????????speech?level?of?an?audio?signal?to?a?predetermined?
**????????????????????????value?noramally?in?db.
**
**?Arguments:
**??float?*x????????????:?input?vector?(range?from?-1?to?1?)
**??float?*y????????????:?output?vector?(range?from?-1?to?1?)
**??float?gain_level????:?output?power?level?in?db
**??int???N?????????????:?number?of?samples?or?frame?length
**
**?Inputs:
**??float?*x?????????????
**??float?gain_level????
**??int???N?????????????
**
**?Outputs:
**??float?*y????????????
**
**?Return?value?????????:?None
**
**?NOTE?????????????????:?For?more?details?refer?matlab?files.?
**
**?Programmer???????????:?Jaydeep?Appasaheb?Dhole
**??????????????????????:?Associate?Software?Engineer?(?DSP?)
**??????????????????????:?Aparoksha?Tech.?Pvt.?Ltd.?Bangalore.
**??????????????????????:?http://www.aparoksha.com
**??????????????????????:?
**
**?Date?????????????????:?26?May?2006.
******************************************************************************/
#include
void??AGC(float?*x?float?*y?float?gain_level?int?N)
{
????int?i;
????float?energy?output_power_normal?K;
????
????/*?ouput?power?gain?level?is?in?db?convert?it?into?normal?power?*/
????output_power_normal?=?(float)pow((double)10(double)(gain_level/10));
????/*?Calculate?the?energy?of?the?signal?*/
????energy?=?0;
????for(i?=?0;?i?????????energy?+=?x[i]?*?x[i];
????/*?calculate?the?multiplication?factor?*/
????K?=?(float)sqrt?((output_power_normal*N)/energy);
????/*?scale?the?input?signal?to?achieve?the?required?output?power?*/
????for(i?=?0;?i?????????y[i]?=?x[i]?*?K?;
}
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????4288??2006-06-01?19:23??data2.mat
?????文件????????2232??2006-05-10?17:52??data.mat
?????文件????????1888??2006-05-26?13:11??AGC.c
?????文件????????2766??2006-05-26?13:10??main.c
?????文件????????1790??2006-05-12?17:20??input.dat
?????文件????????7054??2006-06-01?19:37??AGC.m
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