KR940017251A - Adaptive Bit Allocation Circuit Using Accumulated Data Generation Status - Google Patents

Adaptive Bit Allocation Circuit Using Accumulated Data Generation Status Download PDF

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Publication number
KR940017251A
KR940017251A KR1019920027193A KR920027193A KR940017251A KR 940017251 A KR940017251 A KR 940017251A KR 1019920027193 A KR1019920027193 A KR 1019920027193A KR 920027193 A KR920027193 A KR 920027193A KR 940017251 A KR940017251 A KR 940017251A
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South Korea
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data
data generation
frame
signal
sound quality
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KR1019920027193A
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Korean (ko)
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KR970006630B1 (en
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강철석
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김주용
현대전자산업 주식회사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 디지탈오디오 데이터 압축기기에 적용되는 데이터 압축회로에 관한 것으로, 특히 서브밴드 분석/합성기법에 심리음향모델을 적용하는 데이터 압축기기에 적용할수 있는 누적데이터 발생상태를 이용한 적응비트 할당 회로에 관한 것이다. 그런데 종래의 뮤지캠에서는 상기 양자화 제어신호를 만드는데 있어서 단일 프레임만의 정보를 이용하므로 결과적으로 적은 데이터량만으로도 충분한 음질을 얻을 수 있는 프레임에 대해서는 불필요하게 과다한 데이터를 발생시키는 결과가 되며, 반대로 많은 데이터가 필요한 프레임에 대해서는 충분치 못한 데이터 밖에는 발생시키지 못하므로 음질의 열화를 초래하게 되는 결점이 있다.The present invention relates to a data compression circuit applied to a digital audio data compressor, and more particularly, to an adaptive bit allocation circuit using a cumulative data generation state applicable to a data compressor applying a psychoacoustic model to a subband analysis / synthesis technique. It is about. However, in the conventional music cam, since only one frame of information is used to generate the quantization control signal, unnecessarily excessive data is generated for a frame capable of obtaining sufficient sound quality with only a small amount of data. There is a drawback that the sound quality deteriorates because only enough data is generated for a frame that needs to be used.

본 발명은 이와같은 문제점을 감안하여, 상기의 양자화제어신호(8)를 만드는데 있어서 상기의 결점이 생기는 원인은 어떤 프레임의 코딩결과 발생되는 총 데이터량을 항상 채널의 전송율과 같게하는 제어구조에 있으므로, 현재 프레임의 코딩에 이전 여러 프레임의 누적데이터 발생율을 분석하여 그 결과를 적용하므로서 현재 프레임의 총 데이터발생량을 가변적으로 제어하여 최대의 음질을 얻을 수 있도록 한 것이다.In view of such a problem, the present invention is caused by the above-described drawback in producing the quantization control signal 8 because a control structure that always makes the total data amount generated as a result of coding of a frame equal to the transmission rate of the channel. In addition, by analyzing the cumulative data generation rate of the previous several frames in the coding of the current frame and applying the result, the maximum sound quality is obtained by variably controlling the total data generation amount of the current frame.

Description

누적데이터 발생상태를 이용한 적응비트 할당 회로Adaptive Bit Allocation Circuit Using Accumulated Data Generation Status

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

제2도는 본 발명 누적데이터 발생상태를 이용한 적응비트 할당회로의 구성도이다.2 is a block diagram of an adaptive bit allocation circuit using the cumulative data generation state of the present invention.

Claims (1)

입력된 오디오신호(a)를 예를 들어 32개의 주파수 대역성분(b)로 분해하는 서브밴드 분석필터(10)와; 입력된 오디오신호(a)에 대하여 주파수 성분을 분석하고 이를 근거로 인간의 청각특성에 근거하여 서브밴드 분석결과(b)의 제1양자화율을결정하는 심리음향모델(20)과; 서브밴드 분석필터(10)로 부터 얻은 각 대역신호(b)를 적응 양자화하여 프레임 단위로 총데이터 발생량이 다른 압축된 대역신호(f)를 얻는 양자화기(30)와; 압축된 대역신호(f) 및 기타 제어신호를 전송에 맞는형태로 합성하여 비트스트림(g)을 만드는 프레임포매터(40)와; 수프레임의 비트스트림(g)을 저장하는 선입선출방식(FIF0)으로서 비트스트림(g)을 일정한 전송률로 만들어 전송비트스트림(i)을 만들며, 또한 과거 수프레임의 오디오신호에서 발생된 데이터량을 누적하여 현재 채널상태정보(h)를 만드는 채널버퍼(50)와; 채널상태정보(h)를 이용하여 현재 프레임의데이터 발생량을 예측해서 현재 프레임에 대한 제1양자화신호(d)와 함께 양자화기(30)의 양자화 제어신호(e)를 발생하는 예측기(60)로 구성함을 특징으로 하는 누적데이터 발생상태를 이용한 적응비트 할당 회로.A subband analysis filter 10 for decomposing the input audio signal a into 32 frequency band components b, for example; A psychoacoustic model 20 for analyzing a frequency component of the input audio signal a and determining a first quantization rate of the subband analysis result b based on the human auditory characteristics; A quantizer 30 for adaptively quantizing each band signal b obtained from the subband analysis filter 10 to obtain a compressed band signal f having a different total data generation amount in units of frames; A frame formatter 40 which combines the compressed band signal f and other control signals into a form suitable for transmission to form a bit stream g; A first-in, first-out method (FIF0) that stores bit streams (g) of several frames to make the bitstream (g) at a constant bit rate, thereby creating a transmission bitstream (i). A channel buffer 50 that accumulates to generate current channel state information h; The predictor 60 generates a quantization control signal e of the quantizer 30 together with the first quantized signal d for the current frame by predicting the data generation amount of the current frame using the channel state information h. Adaptive bit allocation circuit using the cumulative data generation state characterized in that the configuration. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920027193A 1992-12-31 1992-12-31 Adaptable bit circuit for accumulated data KR970006630B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920027193A KR970006630B1 (en) 1992-12-31 1992-12-31 Adaptable bit circuit for accumulated data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920027193A KR970006630B1 (en) 1992-12-31 1992-12-31 Adaptable bit circuit for accumulated data

Publications (2)

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KR940017251A true KR940017251A (en) 1994-07-26
KR970006630B1 KR970006630B1 (en) 1997-04-29

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