Technique	BackgroundNoiseLevelType
Document	ISO/IEC WD 15938-4
Name		Joerg Bitzer, Stefan Kudras, Houpert Digital Audio, Germany
EMail		j.bitzer@hda.de
Type		low-level audio descriptor extraction tool
External Libraries  	--
Related Ds/DSs	--
Used Ds/DSs	--
Input		samples of a Wav file
Extraction	Yes
Client Appl	NA
Summary		This component is the BackgroundNoiseLevel descriptor extraction tool
Strong Points 	--	
Limitations	--
Known Problems 	--	
Parameters	auData : 2D matrix : audiostream, N channels in columns
   		fs : number : sample frequency of the signal
   		channels : vector : channels to analyze (if empty all channels are used)
   		szXMLout (optional) : string : name of output XML-file. if not given no XML-output

Output		BNL : vector : vector of length N containing the values of the 
			       BackgroundNoiseLevel with: N = number of channels

Usage		1. run matlab
		2. change the working directory to the directory containing the function
		3. call the function 'BackgroundNoiseLevelD' with the required parameters

Function call example 

>> [BNL] = BackgroundNoiseLevelD(data,44100,[1 2],'BackgroundNoiseLevel.xml');