KR970019115A - Digital audio encoding method and apparatus using lookup table - Google Patents

Digital audio encoding method and apparatus using lookup table Download PDF

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KR970019115A
KR970019115A KR1019950031352A KR19950031352A KR970019115A KR 970019115 A KR970019115 A KR 970019115A KR 1019950031352 A KR1019950031352 A KR 1019950031352A KR 19950031352 A KR19950031352 A KR 19950031352A KR 970019115 A KR970019115 A KR 970019115A
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lookup table
allocation
bit allocation
address
digital audio
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KR1019950031352A
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Korean (ko)
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KR100300956B1 (en
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김도형
김연배
김상욱
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김광호
삼성전자 주식회사
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Priority to DE19638997A priority patent/DE19638997B4/en
Priority to US08/717,610 priority patent/US5864802A/en
Priority to JP25188196A priority patent/JP3927627B2/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L2019/0001—Codebooks
    • G10L2019/0002—Codebook adaptations

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 룩업테이블을 이용한 디지털 오디오 부호화방법 및 장치에 관한 것으로서, 입력되는 오디오신호의 분산, 평균제곱근 및 스케일 팩터 특성에 따라 각 주파수대역에 대한 할당비트를 룩업테이블로 작성하는 과정; 입력되는 시간영역의 오디오신호를 소정갯수의 균등한 주파수대역으로 분할하는 과정; 분할된 각 주파수대역에 대하여 획득한 오디오신호의 특성의 크기순위에 따라 룩업테이블의 주소를 결정하는 과정; 결정된 주소에 해당하는 할당 비트를 각 주파수대역에 대하여 할당한 후, 양자화하는 과정; 및 양자화된 오디오 데이터를 비트스트림으로 형성하는 과정으로 이루어진다. 따라서 청각심리모델을 사용하지 않으므로 부호화기에서의 연산시간 지연을 크게 줄여줌으로써 하드웨어로 구현시 부호화기에서의 실시간 처리가능성이 높아졌다.The present invention relates to a digital audio encoding method and apparatus using a lookup table, comprising: creating a lookup table for allocation bits for each frequency band according to variance, root mean square, and scale factor of an input audio signal; Dividing an input audio signal in a time domain into a predetermined number of equal frequency bands; Determining an address of a lookup table according to the magnitude order of characteristics of the acquired audio signal for each of the divided frequency bands; Allocating allocation bits corresponding to the determined addresses for each frequency band, and then quantizing them; And forming a bitstream of the quantized audio data. Therefore, since the psychoacoustic model is not used, the computation time delay in the encoder is greatly reduced, so that the real-time processing capability of the encoder is increased when the hardware is implemented.

Description

룩업테이블을 이용한 디지탈 오디오 부호화방법 및 장치Digital audio encoding method and apparatus using lookup table

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

제12도는 본 발명에 의한 룩업테이블을 이용한 디지털 오디오 부호화장치를 나타낸 블록도.12 is a block diagram showing a digital audio encoding apparatus using a lookup table according to the present invention.

제13도는 왼쪽 채널의 NMR에 의한 MPEG와 본 발명에 의한 부호화장치의 성능을 비교한 그래프.13 is a graph comparing the performance of the MPEG apparatus according to the NMR of the left channel and the encoding apparatus according to the present invention.

Claims (7)

입력되는 오디오신호의 분산, 평균제곱근 및 스케일 팩터 특성에 따라 각 주파수대역에 대한 할당비트를 룩업테이블로 작성하는 과정; 상기 입력되는 시간영역의 오디오신호를 소정 개수의 균등한 주파수대역으로 분할하는 과정; 상기 분할된 각 주파수 대역에 대하여 획득한 오디오신호의 특성의 크기순위에 따라 상기 룩업 테이블의 주소를 결정하는 과정, 상기 결정된 주소에 해당하는 할당비트를 상기 각 주파수대역에 대하여 할당한 후 양자화하는 과정; 및 상기 양자화된 오디오 대이타를 비트스트림으로 형성하는 과정으로 이루어지는 것을 특징으로 하는 디지털 오디오 부호화방법.Creating a lookup table for allocation bits for each frequency band according to the variance, root mean square, and scale factor of the input audio signal; Dividing the input audio signal in the time domain into a predetermined number of equal frequency bands; Determining an address of the lookup table according to the magnitude order of the characteristics of the acquired audio signal for each of the divided frequency bands, and assigning an allocated bit corresponding to the determined address to each of the frequency bands and quantizing them ; And forming the quantized audio data into a bitstream. 제1항에 있어서, 상기 방법은 상기 룩업테이블에서 할당비트가 0인 주소는 제외시키고, 상기 룩업테이블에 존재하지 않는 주소는 0비트를 할당하여 비트할당을 최적화시키는 과정을 더 포함하는 것을 특징으로 하는 디지털 오디오 부호화방법.The method of claim 1, further comprising optimizing bit allocation by excluding an address having an allocation bit of 0 from the lookup table and allocating 0 bits for an address that does not exist in the lookup table. Digital audio encoding method. 제2항에 있어서, 상기 방법은 상기 룩업테이블에 의한 비트할당 후 , 요구되는 비트수와 실제 비트할당량을 비교하고, 비교결과에 따라 비트할당을 조정하는 과정을 더 포함하는 것을 특징으로 하는 디지털 오디오 부호화방법.The digital audio method of claim 2, further comprising: comparing the required number of bits with the actual bit allocation after bit allocation by the lookup table, and adjusting bit allocation according to a comparison result. Coding method. 입력되는 오디오신호의 분산, 평균제곱근 및 스케일 팩터 특성에 따른 각 주파수 대역에 대한 할당비트에 대한 관계를 작성한 룩업테이블을 구비한 디지털 오디오 부호화장치에 있어서, 상기 입력되는 시간영역의 오디오신호를 소정 개수의균등한 주파수대역으로 분할하기 위한 주파수 맵핑부; 상기 분할된 각 주파수대역에 대하여 획득한 오디오 신호의 특성의 크기순위에 따라 상기 룩업테이블의 주소를 결정하기 위한 특성획득부; 상기 결정된 주소에 해당하는 할당비트를 상기 각 주파수대역에 대하여 할당한 후 양자화하기 위한 비트할당 및 양자화부; 및 상기 양자화된 오디오 데이터를 비트스트림으로 형성하는 프레임 팩킹부를 포함하는 것을 특징으로 하는 디지털 오디오 부호화장치.A digital audio encoding apparatus having a look-up table that prepares a relationship of allocation bits for each frequency band according to the variance, the root mean square, and the scale factor characteristics of an input audio signal, wherein the digital audio encoding apparatus includes a predetermined number of audio signals in the input time domain. A frequency mapping unit for dividing into equal frequency bands; A characteristic acquisition unit for determining an address of the lookup table according to the magnitude order of the characteristic of the audio signal obtained for each of the divided frequency bands; A bit allocation and quantization unit for quantizing the allocation bits corresponding to the determined addresses for the respective frequency bands; And a frame packing unit to form the quantized audio data into a bitstream. 제4항에 있어서, 상기 룩업테이블에서 할당비트가 0인 주소는 제외시키는 것을 특징으로 하는 디지털 오디오 부호화장치.The digital audio encoding apparatus of claim 4, wherein an address having an allocation bit of 0 is excluded from the lookup table. 제5항에 있어서, 상기 비트할당 및 양자화부에서는 상기 룩업테이블에 존재하지 않는 주소는 0비트를 할당하여 비트할당을 최적화시키는 것을 특징으로 하는 디지털 오디오 부호화장치.6. The digital audio encoding apparatus of claim 5, wherein the bit allocation and quantization unit optimizes bit allocation by assigning 0 bits to an address that does not exist in the lookup table. 제4항에 있어서, 상기 비트할당 및 양자화부에서는 상기 록업테이블에 의한 비트할당 후, 요구되는 비트수와 실제 비트할당량을 비교하고, 비교결과에 따라 비트할당을 조정하는 것을 특징으로 하는 디지털 오디오 부호화장치.The digital audio encoding according to claim 4, wherein the bit allocation and quantization unit compares the required number of bits with the actual bit allocation after bit allocation by the lockup table, and adjusts bit allocation according to the comparison result. Device. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950031352A 1995-09-22 1995-09-22 Digital audio encoding method using lookup table and apparatus for the same KR100300956B1 (en)

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KR1019950031352A KR100300956B1 (en) 1995-09-22 1995-09-22 Digital audio encoding method using lookup table and apparatus for the same
DE19638997A DE19638997B4 (en) 1995-09-22 1996-09-23 Digital audio coding method and digital audio coding device
US08/717,610 US5864802A (en) 1995-09-22 1996-09-23 Digital audio encoding method utilizing look-up table and device thereof
JP25188196A JP3927627B2 (en) 1995-09-22 1996-09-24 Digital audio encoding method

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