04-02-2014
Reminds me of something Richard Feynman said about having too many different units to express the same thing....in this case he was talking about energy.
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..........
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....
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LEARN ABOUT SUNOS
mlib_signallpcautocorrelgetenergy_f32
mlib_SignalLPCAutoCorrelGetEnergy_F32(3MLIB) mediaLib Library Functions mlib_SignalLPCAutoCorrelGetEnergy_F32(3MLIB)
NAME
mlib_SignalLPCAutoCorrelGetEnergy_F32 - return the energy of the input signal
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_SignalLPCAutoCorrelGetEnergy_F32(mlib_f32 *engery, void *state);
DESCRIPTION
The mlib_SignalLPCAutoCorrelGetEnergy_F32() function returns the energy of the input signal.
In linear predictive coding (LPC) model, each speech sample is represented as a linear combination of the past M samples.
M
s(n) = SUM a(i) * s(n-i) + G * u(n)
i=1
where s(*) is the speech signal, u(*) is the excitation signal, and G is the gain constants, M is the order of the linear prediction fil-
ter. Given s(*), the goal is to find a set of coefficient a(*) that minimizes the prediction error e(*).
M
e(n) = s(n) - SUM a(i) * s(n-i)
i=1
In autocorrelation method, the coefficients can be obtained by solving following set of linear equations.
M
SUM a(i) * r(|i-k|) = r(k), k=1,...,M
i=1
where
N-k-1
r(k) = SUM s(j) * s(j+k)
j=0
are the autocorrelation coefficients of s(*), N is the length of the input speech vector. r(0) is the energy of the speech signal.
Note that the autocorrelation matrix R is a Toeplitz matrix (symmetric with all diagonal elements equal), and the equations can be solved
efficiently with Levinson-Durbin algorithm.
See Fundamentals of Speech Recognition by Lawrence Rabiner and Biing-Hwang Juang, Prentice Hall, 1993.
PARAMETERS
The function takes the following arguments:
energy The energy of the input signal.
state Pointer to the internal state structure.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
mlib_SignalLPCAutoCorrelInit_F32(3MLIB), mlib_SignalLPCAutoCorrel_F32(3MLIB), mlib_SignalLPCAutoCorrelGetPARCOR_F32(3MLIB), mlib_SignalLP-
CAutoCorrelFree_F32(3MLIB), attributes(5)
SunOS 5.10 10 Nov 2004 mlib_SignalLPCAutoCorrelGetEnergy_F32(3MLIB)