Abstract
We present a fast implementation of a recently proposed speech
compression scheme, based on an all-pole model
of the vocal tract. Each frame of the speech signal is analyzed by storing
the parameters of the complex damped exponentials deduced from the
all-pole model
and its initial conditions. In mathematical terms, the analysis stage
corresponds to solving a structured total least squares (STLS) problem. It is shown
that by exploiting the displacement rank structure of the involved
matrices the STLS
problem can be solved in a very fast way. Synthesis is
computationally very cheap since it consists of adding
the complex damped exponentials based on the transmitted parameters.
The compression scheme is applied on a speech signal. The speed
improvement of the fast vocoder analysis scheme is demonstrated. Furthermore, the
quality of the compression scheme is
compared with that of a standard coding algorithm, by using
the segmental Signal-to-Noise Ratio.
Anno
2003
Autori IAC
Tipo pubblicazione
Altri Autori
Lemmerling, P., Mastronardi N., Van Huffel, S.
Editore
North Holland [etc.]
Rivista
Linear algebra and its applications