Sound quality adjusting apparatus and sound quality adjusting method

Abstract

An LPF extracts the intermediate and lower frequency components of an input audio signal, while an HPF extracts the higher and lower frequency components of the input audio signal. One of two level determining elements determines the level of the output signal from the LPF, thereby determining whether the intermediate and lower frequency components are present, while the other level determining element determines the level of the output signal from the HPF, thereby determining whether the higher frequency components are present. An inverter inverts the level of the output signal from the one level determining element. An AND gate carries out the logical AND between the output signal from the inverter and that from the other level determining element. An integrator integrates the output signal from the AND gate. If no intermediate and lower frequency components are present but any higher frequency components are present, then a VCA determines that the audio signal is representative of a sibilant, and then attenuates the level of the output signal from the HPF. If any intermediate and lower frequency components are present, then the VCA determines that the audio signal is representative of an ordinary voice, and then passes the output signal from the HPF as it is. An adder adds together the output signal from the LPF and that from the VCA to combine them.

Description

technical field [0001] The present invention relates to a sound quality adjustment device and a sound quality adjustment method for adjusting the sound quality of reproduced sound. Background technique [0002] With the start of BS (satellite) broadcasting, audio signals in recent television systems are transmitted in digital form, and have a wide frequency band from low to high frequencies, flat frequency characteristics, and high-quality signals with less noise. On the other hand, a speaker installed in a television receiver for reproducing such an audio signal is limited in size and shape due to space restrictions and price restrictions imposed by the installation in the television receiver. Accordingly, it is difficult for a speaker of a television receiver to have a flat frequency characteristic from low frequencies to high frequencies. [0003] Therefore, in order to improve the sound quality at the time of playback, various methods have been proposed (JP-A-2002-51347...

AI Technical Summary

Problems solved by technology

[0004] In addition, due to the distortion of high-frequency frequency characteristics, there is a problem that the pronunciation of [サ], [シ], [ス], [セ], and [ソ] in the language that emphasizes the announcer's voice sounds harsh sound

[0017] However, when a radio station uses Diesa to record sound, although it has the effect of reducing sibilance, if Diesa is used to reduce the harsh sibilance remaining in the sound obtained by receiving TV broadcasts, it will not only The sibilance in the pass band of the BPF is reduced, and even the BGM (background music) or effect sound mixed with the sound is also reduced, resulting in a sound quality where high-frequency components are lost

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