KR950030498A

KR950030498A - Low-Dedicated Channel System and Method Using Redundant Data

Info

Publication number: KR950030498A
Application number: KR1019940008136A
Authority: KR
Inventors: 박동찬
Original assignee: 김주용; 현대전자산업 주식회사
Priority date: 1994-04-18
Filing date: 1994-04-18
Publication date: 1995-11-24

Abstract

본 발명은 심리음향모델을 이용한 압축 알고리즘인 엠펙 레이어Ⅱ에서 특히 데이타 서비스를 위한 여분의 잉여 데이타(ancillary data)에 저역신호만을 할당하여 별도의 저역 전용채널을 구성하는 잉여 데이타를 이용한 저역전용채널 시스템 및 방법에 관한 것으로, 종래 데이타 압축알고리즘인 엠펙 레이어Ⅱ는 출력은 4채널이 가능하도록 되어 있지만 4채널 소스의 부족으로 전 채널을 모두 활용하지 못해 증폭기에 의존하여 저역신호를 증폭하는 방법을 사용하나 이와같은 방법은 중 저역 주파수대 신호를 효율적으로 압축하지 못하는 문제점이 있어 이를 해결코자, 데이타 서비스를 위한 잉여 데이타에 저역신호만을 할당하므로써 최근 아날로그 증폭기등에서 사용하는 서브우퍼(subwoofer)의 기능을 첨가하여 풍부한 소리를 출력할 수 있고, 또한 소스 코딩에서 중저역을 출력시켜줌으로써 기존의 앰프자체의 기능으로 만들어주는 우퍼신호에 비해 훨씬 고음질의 신호를 얻을 수 있다.In the present invention, MPEG layer II, a compression algorithm using a psychoacoustic model, allocates only low-band signals to extra ancillary data for data services, and uses a low-band-only channel system using redundant data to form a separate low-band dedicated channel. The MPEG layer II, which is a conventional data compression algorithm, is capable of outputting four channels, but because of lack of four channel sources, all channels cannot be utilized. In order to solve this problem, the low frequency band signal cannot be compressed efficiently. Therefore, the low frequency signal is allocated only to the surplus data for data service, thereby adding a function of the subwoofer used in analog amplifiers. Can output sound, also source code By giving to the output from the jungjeoyeok you can get a much higher quality signal than the subwoofer signal to make a feature of the conventional amplifier itself.

Description

Low-Dedicated Channel System and Method Using Redundant Data

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명을 위한 엠펙 레이어Ⅱ알고리즘 순서도.Figure 2 is a flow chart of the MPEG layer II algorithm for the present invention.

Claims

A bit stream formatter (5) which synthesizes the output signal through a psychoacoustic model (3) for filtering the input signal and determining the quantization rate based on it, and a bit allocation (4) for compressing the signal. In an audio system having an encoding unit composed of a plurality of s), a low pass filter for extracting only the middle and low bands of the input frequency signal in parallel with the first filter 1 that decomposes the input digital signal s into frequency band components 2) and an encoding unit configured to be separately stored in the redundant data 6 connected between the bit allocation 4 and the bit stream 5 for compressing each band signal. Low-dedicated channel system using the surplus data, characterized in that it has.

In the MPEG LAYER II compression algorithm, the input signal is classified by subband analysis and bands, quantized, and then formatted into a form suitable for transmission. Before the step of subband analysis and classification by band of the MPEG layer II compression algorithm, Residual frequency, characterized in that the addition of the step (N1) of extracting and outputting data having a frequency component of 200 [HZ] to 1 [KHZ] of the input frequency band through a separate filter Low-dedicated channel method using data.

※ Note: The disclosure is based on the initial application.