KR980004765A - Method and apparatus for converting the number of channels when reproducing multi-channel audio data - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel number conversion method and apparatus for reproducing data in a multi-channel audio format. To this end, a control unit enables processing according to the position information of the sound source and the speaker when the audio signal generated from the M sound sources is input, and enables the output value to be adjusted according to the speaker / headphone output power. And a data processing unit for converting the number of channels into N number of M sound sources while considering the incoming signals to the final ear. Therefore, by using a small number of loudspeakers, it is possible to obtain an effect when a larger number of speakers are used, and by performing different processes in the case of reproduction using a speaker and reproduction using a headphone, Thereby enabling appropriate processing.

Description

Method and apparatus for converting the number of channels when reproducing multi-channel audio data

Since this is a trivial issue, I did not include the contents of the text.

FIG. 5 is a blur diagram showing a channel number converting apparatus for reproducing multi-channel audio data according to the present invention; FIG.

FIG. 6 is a detailed block diagram of a channel number converting apparatus for reproducing the multi-channel audio data shown in FIG. 5; FIG.

FIG. 7 is a detailed block diagram of the speed output compensation section in FIG. 5 and FIG. 6; FIG.

FIG. 8 is a detailed block diagram of each part in FIG. 7; FIG.

FIG. 9 is a layout diagram of a speaker when reproducing two channels. FIG.

FIG. 10 is a diagram for explaining a process in each part of the conversion apparatus when reproducing the multi-channel audio data shown in FIG. 5; FIG.

11A to 11C show examples of the reproduced channel number conversion according to the present invention.

Claims (11)

A control unit that enables processing according to the position information of the sound source and the speaker when an audio signal generated from the M sound sources is input and enables adjustment of the output value according to the speaker / headphone output; And a data processing unit for converting the number of channels into M number of sound sources while considering the incoming signals to the final ears and processing the number of channels. The apparatus of claim 1, wherein the controller comprises a sound source dentition control unit for controlling the position of the sound source and a speaker control unit for controlling the loudspeaker. 2. The apparatus of claim 1, wherein the data processing unit comprises: a sound source position compensating unit that uses the position information of the output speaker disposed on the three-dimensional space to process the headphones to have a sense of presence as if they were reproduced from speakers; And a speaker output compensating unit for compensating for the difference between the number of original input channels and the number or positions of channels used in reproduction. 4. The apparatus of claim 3, wherein the speaker output compensator comprises: a speaker / headphone output controller for processing data on a speaker or headphone reproduction; A speaker output characteristic compensation unit for considering the characteristics of the processed values when reaching the ear when the audio signals are reproduced by the N speakers; And an adder for obtaining an output value for the speaker output and the headphone output. The method as claimed in any one of claims 1 to 4, wherein HRTF is used when converting the number of channels to the number of reproduced channels when the number of input channels and the number of reproduced channels of audio data are different. Water conversion device. The method as claimed in any one of claims 1 to 4, wherein when the reproduction position of the audio data in the three-dimensional space is shifted, the position shift is compensated using HRTF. Water conversion device. 5. The method according to any one of claims 1 to 4, characterized in that processing is performed using different topological values depending on the respective frequency components and positions when the number of reproduced channels or positions in the three-dimensional space of the audio data fluctuates. A channel number conversion device for reproducing data. 8. The apparatus of claim 7, wherein a transfer function characteristic in the middle ear of a human is used as the constant value. Da food (Where HR ₁ , HR ₂ , HL ₁ and HL ₂ are values determined when the position of the speaker is fixed, and H _AR and H _AL are known values determined according to the position of the sound source). And H _ML and H _ML , which are represented by H _MR and H _{ML, respectively} , and restores one channel to two channels. Da food And mapping the M input channels to N reproduction channels by mapping the transfer function represented by the transfer function to the N reproduction channels. Da food Channel audio data is reproduced by using two speakers to obtain a transfer function expressed by the following equation. ※ Note: It is disclosed by the contents of the first application.