Audio Toolkit - audioEnvelope

[minenv ,maxenv, loc, fs] = audioEnvelope(audiodata)

[minenv ,maxenv, loc, fs] = audioEnvelope(filename)

[minenv ,maxenv, loc, fs] = audioEnvelope(___, propname, propvalue …)

audioEnvelope(___)

calculate envelope information for a audio signal.

Inputs

audiodata - input data, as a matrix or column vector where each column is a channel.

filename - input audio file to read.

propname, propvalue - property name/value pairs.

Known properties are:

NumPoints

Number of points that make up each envelop (default 1000)

SampleRate

Samplerate of the input data. When a filename is specified, sample rate is taken from the file.

Range

A 2 element vector for the start,end range of input signal to be used.

Outputs

minenv - minimum values of the envelope as a NumPoints-by-C matrix, where C is the number of channels in the input signal.

maxenv - maximum values of the envelope as a NumPoints-by-C matrix, where C is the number of channels in the input signal.

loc - Index into the audioodata for each frame.

fs - Sample rate. If the input is audiodata, and no sample rate option was provided, fs will be 1.