Signal processing method and apparatus, and recording medium in which a signal processing program is recorded

Abstract

A signal processing method for converting a signal received via a transmission path or read from a storage medium into a first audible signal, and suppressing a noise other than a desired signal contained in the first audible signal based on predetermined audio quality adjustment information, comprising steps of: in suppressing a noise other than a desired signal contained in the first audible signal to generate an enhanced signal, receiving audio quality adjustment information for adjusting audio quality; and adjusting audio quality of the enhanced signal using the audio quality adjustment information

Description

INCORPORATION BY REFERENCE[0001]This application claims the priority based on a Japanese Patent Application No. 2007-55146 filed on Mar. 6, 2007, disclosure of which is incorporated herein in its entirety by reference.BACKGROUND ART[0002]The present invention relates to method, apparatus and program for signal processing that realizes a function of suppressing a noise superposed over a desired voice signal, and more particularly to method, apparatus and program for signal processing for performing suppression at a position close to a reproducing device such as a speaker.[0003]Conventionally, a noise suppressor (noise suppression system) is a system for suppressing a noise superposed over a desired voice signal, and in general, it operates to suppress a noise mixed in a desired voice signal by estimating a power spectrum of a noise component using an input signal converted into a frequency domain, and subtracting the estimated power spectrum from the input signal. By estimating the p...

AI Technical Summary

Benefits of technology

[0012]Moreover, another objective of the present invention is to provide method, apparatus and program for signal processing having a function for allowing a user to adjust audio quality according to the user's preferences.

Problems solved by technology

Moreover, the most comfortable combination of residual noise and output distortion is different from user to user, so that it is impossible to preset audio quality that satisfies a plurality of users.

However, the conventional configuration described with reference to FIG. 29 does not allow a user to operate the noise suppressor 710 because it is placed temporally and spatially remote from the user.

Accordingly, when a high residual noise is present due to the noise suppressor 710 or the function of the noise suppressor 710 is disabled in the configuration disclosed in FIG. 29, there arises a problem that a user of the receiver terminal 9000 should catch a low-quality voice having a high background noise.

Moreover, there is another problem that some users may hear an objectionable noise due to CNG because too high a level of CNG is made by the decoder 920.

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