KR970019116A - 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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KR970019116A
KR970019116A KR1019950031355A KR19950031355A KR970019116A KR 970019116 A KR970019116 A KR 970019116A KR 1019950031355 A KR1019950031355 A KR 1019950031355A KR 19950031355 A KR19950031355 A KR 19950031355A KR 970019116 A KR970019116 A KR 970019116A
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lookup table
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bit
allocation
address
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김도형
서양석
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김광호
삼성전자 주식회사
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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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Abstract

본 발명은 룩업테이블을 이용한 디지털 오디오 부호화방법 및 장치에 관한 것으로서, 입력되는 스테레오 오디오신호의 스케일 팩터와 제곱평균 특성의 조합에 따라 각 주파수대역에 대한 할당비트를 룩업테이블로 작성하는 과정; 입력되는 시간영역의 오디오신호를 소정 갯수의 균등한 주파수대역으로 분할하는 과정; 분할된 각 주파수대역에 대하여 획득한 오디오신호의 특성의 크기순위에 따라 룩업테이블의 주소를 결정하는 과정; 결정된 주소에 해당하는 할당비트를 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 a combination of a scale factor and a root mean square characteristic of an input stereo 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 an allocation bit corresponding to the determined address for each frequency band and quantizing the allocation bit; 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, and thus the real-time processing capability of the encoder is increased when implemented in hardware.

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.

제3도는 본 발명에 의한 룩업테이블을 이용한 디지털 오디오 부호화장치를 나타낸 블록도.3 is a block diagram showing a digital audio encoding apparatus using a lookup table according to the present invention.

제4도는 왼쪽 채널의 NMR에 의한 MPEG와 본 발명에 의한 부호화장치의 성능을 비교한 그래프.4 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 (10)

입력되는 스테레오 오디오신호의 스케일 팩터와 제곱평균 특성의 조합에 따라 각 주파수 대역에 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 데이타를 비트스트림으로 형성하는 과정으로 이루어지는 것을 특징으로 하는 디지털 오디오 부호화방법.Creating a lookup table for allocated bits in each frequency band according to a combination of a scale factor and a root mean square characteristic of an input stereo 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, 비트값이 변하는 경계부분만 저장하여 비트할당을 최적화시키는 과정을 더 포함하는 것을 특징으로 하는 디지털 오디오 부호화방법.The digital audio encoding method of claim 1, further comprising optimizing bit allocation by excluding an address having an allocation bit of 0 from the lookup table and storing only a boundary portion where a bit value changes. . 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.3. 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 the comparison result. Encoding Method. 제3항에 있어서, 상기 실제 비트할당량이 요구되는 비트수보다 적게 할당된 경우, 낮은 주파수대역에서부터 점유율이 가장 큰 대역을 찾아 1비트씩 증가시키고, 상기 실제 비트할당량이 요구되는 비트수보다 많게 할당된 경우, 높은 주파수대역에서부터 점유율이 가장 작은 대역을 찾아 1비트씩 감소시키는 것을 특징으로 하는 디지털 오디오부호화방법.The method according to claim 3, wherein when the actual bit allocation is allocated less than the required number of bits, the band having the largest occupancy rate is found from the low frequency band and increased by one bit, and the actual bit allocation is allocated more than the required number of bits. If it is, the digital audio encoding method characterized by finding the band with the smallest occupancy from the high frequency band by one bit. 제1항에 있어서, 상기 룩업테이블의 주소는 전체 대역에 대한 각 주파수대역에서의 스케일 팩터와 제곱평균의 점유율을 이용하여 계산하는 것을 특징으로 하는 디지털 오디오 부호화방법.The digital audio encoding method of claim 1, wherein the address of the lookup table is calculated by using a scale factor and an occupancy rate of the root mean square in each frequency band for the entire band. 제1항에 있어서, 조인트-스테레오 모드인 경우 상기 스테레오 모드에서 사용한 룩업테이블을 그대로 적용시키는 것을 특징으로 하는 디지털 오디오 부호화방법.The digital audio encoding method of claim 1, wherein the lookup table used in the stereo mode is applied as it is in the joint-stereo mode. 제6항에 있어서, 상기 방법에서는 각 대역의 점유율을 구하여 조인트-스테레오 모드로 부호화할 대역의 경계를 찾는 것을 특징으로 하는 디지털 오디오 부호화방법.The digital audio encoding method according to claim 6, wherein the method finds the boundary of the band to be encoded in the joint-stereo mode by obtaining the occupancy ratio of each band. 입력되는 스테레오 오디오신호의 스케일 팩터 및 제곱평균 특성에 따른 각 주파수대역에 대한 할당비트에 대한 관계를 작성한 룩업테이블을 구비한 디지털 오디오 부호화장치에 있어서, 상기 입력되는 시간영역의 오디오 신호를 소정 갯수의 균등한 주파수대역으로 분할하기 위한 주파수 맵핑부; 상기 분할된 각 주파수대역에 대하여 획득한 오디오 신호의 특성의 크기순위에 따라 상기 룩업테이블의주소를 결정하기 위한 특징획득부; 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 creates a relationship between allocation bits for each frequency band according to a scale factor and a root mean square characteristic of an input stereo audio signal, comprising: a predetermined number of audio signals in the input time domain; A frequency mapping unit for dividing into equal frequency bands; A feature acquisition unit for determining an address of the lookup table according to the order of magnitude 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. 제8항에 있어서, 상기 룩업테이블에서 할당비트가 0인 주소는 제외시키고, 비트값이 변화는 경계부분만 저장하여 비트할당을 최적화시키는 과정을 더 포함하는 것을 특징으로 하는 디지털 오디오 부호화장치.10. The digital audio encoding apparatus of claim 8, further comprising optimizing bit allocation by excluding an address having an allocation bit of 0 from the lookup table and storing only a boundary portion where a bit value is changed. 제8항에 있어서, 상기 룩업테이블의 주소는 전체 대역에 대한 각 주파수대역에서의 스케일 팩터와 제곱평균의 점유율을 이용하여 계산하는 것을 특징으로 하는 디지탈 오디오 부호화장치.10. The digital audio encoding apparatus of claim 8, wherein the address of the lookup table is calculated using the occupancy ratio of the scale factor and the root mean square in each frequency band for the entire band. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950031355A 1995-09-22 1995-09-22 Digital audio encoding method using lookup table and apparatus for the same Expired - Fee Related KR100300957B1 (en)

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KR1019950031355A KR100300957B1 (en) 1995-09-22 1995-09-22 Digital audio encoding method using lookup table and apparatus for the same
US08/717,610 US5864802A (en) 1995-09-22 1996-09-23 Digital audio encoding method utilizing look-up table and device thereof
DE19638997A DE19638997B4 (en) 1995-09-22 1996-09-23 Digital audio coding method and digital audio coding device
JP25188196A JP3927627B2 (en) 1995-09-22 1996-09-24 Digital audio encoding method

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KR100918115B1 (en) * 2007-09-28 2009-09-22 한국전자통신연구원 A plurality of variable element control methods based on lookup table

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KR100460804B1 (en) * 1997-09-03 2005-04-06 삼성전자주식회사 Stereoscopic Image Diffusion Device Using Lookup Table
KR100723400B1 (en) 2004-05-12 2007-05-30 삼성전자주식회사 Digital signal encoding method and apparatus using a plurality of lookup tables
KR100695125B1 (en) 2004-05-28 2007-03-14 삼성전자주식회사 Digital signal encoding / decoding method and apparatus

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JPS63253785A (en) * 1986-11-14 1988-10-20 Toshiba Corp Image compressing device
US5408580A (en) * 1992-09-21 1995-04-18 Aware, Inc. Audio compression system employing multi-rate signal analysis

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KR100918115B1 (en) * 2007-09-28 2009-09-22 한국전자통신연구원 A plurality of variable element control methods based on lookup table

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