class AuEnergy

This class implements routines to calculate signal energy and power in time and frequency domain

Public Methods

static double energy(const AudioCache& cache)

Function to calculate signal energy on the samples stored in the audio cache

static double energyFFT(const ComplexFFT::ComplexWave& wave, const uint32 samplingRate)

Function to calculate signal energy on the complex samples stored in the wave vector

static double power(const AudioCache& cache)

Function to calculate signal power on the samples stored in the audio cache

static double energy(const AudioCache& cache)

Function to calculate signal energy on the samples stored in the audio cache. The original definition of the signal energy of a discrete-time signal is:
E = lim{n->infty} 1/sampling_rate * sum{-n to n}( sqr( abs(x(n)) ) )

Returns:

calculated energy

Parameters:

cache - audio cache containing the signal

static double power(const AudioCache& cache)

Function to calculate signal power on the samples stored in the audio cache. The original definition of the signal power of a discrete-time signal is:
P = lim{n->infty} 1/(2*n+1) * sum{-n to n}( sqr( abs(x(n)) ) ) We have restricted n to the size of the audio cache!

Returns:

calculated power

Parameters:

cache - audio cache containing the signal

static double energyFFT(const ComplexFFT::ComplexWave& wave, const uint32 samplingRate)

Function to calculate signal energy on the complex samples stored in the wave vector. The original definition is:
E = Integral{-samplingRate/2 to samplingRate/2} ( sqr(1/samplingRate) * sqr(abs(X(f))) ) df

Returns:

calculated energy

Parameters:

wave - vector of complex samples (= signal)
samplingRate - used sampling rate

This class has no child classes.

Author:

Silvia Pfeiffer, Peter Tomczyk

Version:

$Id: energy.h,v 1.5 1998/03/26 13:30:46 tomczyk Exp $

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