Signal e.g. audio signal, coding method, for e.g. Internet type network, involves generating temporal filter to find signal close to original signal when filter is applied to signal obtained by enlargement of spectrum of limited signal

摘要

#CMT# #/CMT# The method involves obtaining a limited frequency signal, where the frequency of original signal is reduced by suppressing high frequencies. A temporal filter is generated by a generation module (104) to find a signal spectrally close to the original signal when the filter is applied to a signal obtained by enlargement of a spectrum of limited signal. The filter is obtained by a member-to-member division based on the coefficients of Fourier transformation applied to a portion of the original signal and to a portion corresponding to the signal obtained by enlargement of the spectrum. #CMT# : #/CMT# Independent claims are also included for the following: (1) a method for decoding a part of a signal (2) a device for coding a signal, comprising a frequency limited signal obtaining unit (3) a device for decoding a signal, comprising a signal receiving unit (4) a signal comprising a limited frequency audio signal representing a frequency limited version of original audio signal. #CMT#USE : #/CMT# Method for coding a signal e.g. audio signal, to be transmitted on a computer network e.g. Internet type, network. #CMT#ADVANTAGE : #/CMT# The application of the temporal filter permits to bring back the shape of reconstituted high frequency part and to correct compression artifacts presented in low frequency part, such that the filter is applied to the reconstituted signal in a simple and inexpensive manner, thus obtaining a good quality signal. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a general architecture illustrating a method for coding audio signal. 100 : Signal 101 : Input signal 103 : Frequency extension module 104 : Generation module 106 : Compression module 107 : Decoding module.