KR960018982A - Digital audio filtering method and device - Google Patents

Digital audio filtering method and device Download PDF

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KR960018982A
KR960018982A KR1019940030042A KR19940030042A KR960018982A KR 960018982 A KR960018982 A KR 960018982A KR 1019940030042 A KR1019940030042 A KR 1019940030042A KR 19940030042 A KR19940030042 A KR 19940030042A KR 960018982 A KR960018982 A KR 960018982A
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vector
discrete cosine
inverse discrete
window
cosine transform
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KR0138300B1 (en
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심인식
오영화
조준희
신정철
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김광호
삼성전자 주식회사
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech 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
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00Conversion 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
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Abstract

본 발명에 의한 디지탈 오디오필터링방법 및 그 방법을 수행하기 위한 장치를 공개한다. 디지탈 오디오필터링방법은 부호화된 디지탈 오디오데이타가 복호화되어 역양자화된 32개의 부밴드표본을 입력하여 2048개의 역이산코사인변환계수(Nik)에서 인자 i를 32개로, 인자 k를 16개로 줄이고, Nik가 128개의 서로 다른 값이 되도록 하고, 부밴드표본(S)을 가지고 32개의 역이산코사인벡터(Vi)를 다음 식에 따라서 구하는 역이산코사인벡터단계와,역이산코사인벡터단계후에 역이산코사인벡터(Vi), 윈도윙벡터(Di) 및 이전(n-1)블럭의 윈도우드벡터로부터 512개의 현재블럭(n)의 윈도우드벡터를 다음 식에 따라 구하는 윈도우벡터단계와,란 I를 p의 배수로 나눈후의 나머지를 의미하며, 여기서 %은 나머지 연산자이다.) 윈도우드벡터를 저장후 초기화하고, PCM샘플로 출력하는 것을 특징으로 하고, 디지탈 오디오필터링장치는 부호화된 디지탈 오디오데이타가 복호화되고 역양자화된 부밴드표본을 입력하여 역이산코사인변환계수(Nik)와 윈도윙벡터를 저장하고 있는 제2기억수단과, 역이산코사인변환계수와 부밴드표본을 입력받아 역이산코사인변환벡터를 구하고, 윈도윙벡터와 역이산코사인변환벡터 및 이전 블럭의 윈도우드벡터를 입력받아 현재의 윈도우드벡터를 구하기 위해 연산을 수행하는 연산수단과, 주소발생부가 부밴드표본을 발생하도록 제어하고, 역이산코사인변환계수와 윈도윙벡터가 연산수단에 입력되도록 제어하고, 연산을 제어하는 제어수단을 구비하는 것을 특징으로 하며, 종래의 동작주파수보다 1/4정도 줄어든 낮은 동작주파수에서 동작하기 때문에 회로의 구현이 간단하고, 회로의 제작비가 적게 들며, 역이산코사인변환 계수의 수가 줄어들어 ROM테이블이 줄어들고, 따라서 칩 크기 면에서 많은 효과를 볼 수 있다.Disclosed is a digital audio filtering method and apparatus for performing the method. The digital audio filtering method inputs 32 subband samples in which encoded digital audio data is decoded and dequantized, thereby reducing the factor i to 32 and the factor k to 16 in 2048 inverse discrete cosine transform coefficients (N ik ). an inverse discrete cosine vector step in which ik is 128 different values and the 32 inverse discrete cosine vectors (V i ) having subband samples (S) are obtained according to the following equations, Window of vector of inverse discrete cosine vector (Vi), window wing vector (Di) and previous (n-1) after inverse discrete cosine vector step Window vectors of 512 current blocks (n) from A window vector step of Is the remainder after dividing I by a multiple of p, where% is the remainder operator.) The window vector is stored, initialized, and output as a PCM sample, and the digital audio filtering device is encoded digital audio data. The second storage means for storing the inverse discrete cosine transform coefficient ( Nik ) and the windowing vector by inputting the decoded and inversely quantized subband sample, the inverse discrete cosine transform coefficient and the subband sample. A calculation means for obtaining a transform vector, receiving a windowing vector, an inverse discrete cosine transform vector, and a window vector of a previous block, and calculating a current window vector, and controlling the address generator to generate a subband sample And control means for controlling the inverse discrete cosine transform coefficient and the windowing vector to be input to the calculation means, and controlling the calculation. In addition, since it operates at a lower operating frequency, which is reduced by about 1/4 of the conventional operating frequency, the circuit is simple to implement, the manufacturing cost of the circuit is low, and the number of inverse discrete cosine transform coefficients is reduced, thereby reducing the ROM table. Many effects can be seen in.

Description

디지탈 오디오 필터링방법 및 장치Digital audio filtering method and device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제7도는 제6도에 도시된 플로우차트를 수행하기 위한 본 발명에 의한 디지탈 오디오필터링장치의 블럭도이다.7 is a block diagram of a digital audio filtering apparatus according to the present invention for performing the flowchart shown in FIG.

Claims (6)

부호화된 디지탈 오디오데이타를 입력하여 부가정보를 복호화하는 복호화단계와, 상기 복호화된 샘플들을 역양자화하여 부밴드표본을 출력하는 역양자화단계와, 상기 부밴드표본을 입력하여 역이산코사인변환하여 윈도우드벡터를 만든 다음 PCM 샘플들을 출력하는 오디오필터링단계를 포함하는 디지탈 오디오복호기에서 상기 오디오필터링단계는 제1소정수(p)의 상기 부밴드표본을 입력받아 제2소정수(x)의 역이산코사인변환계수(Nik: 여기서 i와 k는 상기 역이산코사인변환계수가 저장된 주소를 저장하기 위한 인자임)에서 상기 인자 i의 값을 제3소정수로 줄이고, 상기 인자 k의 값을 제4소정수로 줄이고, 상기 역이산코사인변환계수가 제5소정수의 서로 다른 값을 가지도록 하고, 상기 부밴드표본(S)을 가지고 상기 제1소정수의 역이산코사인벡터(Vi)를 다음 식에 따라서 구하는 역이산코사인벡터단계;상기 역이산코사인벡터단계후에 상기 역이산코사인벡터(Vi), 윈도윙벡터(Di) 및 이전(n-1)블럭의 윈도우드벡터()로부터 제6소정수의 현재(n)블럭의 윈도우드벡터()를 다음 식에 따라 구하는 윈도우벡터단계와 :란 i를 p의 배수로 나눈후의 나머지를 의미하며, 여기서 %은 나머지 연산자이다.) 상기 제1소정수로 연속하는 상기 윈도우드벡터들로 구성된 벡터열들이 제5소정수가 있을 때, 제1벡터열부터 마지막 벡터열까지 PCM출력버퍼에 순차적으로 저장하는 저장단계; 상기 벡터열이 상기 PCM출력버퍼에 저장된 후 비어진 상기 윈도우벡터의 자리로 아직 저장되지 않은 상기 모든 벡터열들을 이동시킨후에 남게 되는 상기 윈도우벡터의 자리를 초기화하는 초기화단계; 상기 초기화 단계후에 상기 PCM출력버퍼에 저장된 상기 벡터열들을 상기 PCM샘플들로 출력하는 출력단계를 구비하는 것을 특징으로 하는 디지탈 오디오필터링방법.A decoding step of inputting coded digital audio data to decode additional information, an inverse quantization step of inversely quantizing the decoded samples and outputting a subband sample, and inputting the subband sample to inverse discrete cosine transform to window In the digital audio decoder including an audio filtering step of generating a vector and then outputting PCM samples, the audio filtering step receives an inverse discrete cosine of the second predetermined integer (x) by receiving the subband sample of the first predetermined integer (p). In the conversion coefficient (N ik : where i and k are factors for storing the address where the inverse discrete cosine transform coefficient is stored), the value of the factor i is reduced to a third constant and the value of the factor k is determined by the fourth predetermined value. Reduce the number, and make the inverse discrete cosine transform coefficient have different values of the fifth predetermined constant, and have the subband sample S, and the inverse discrete cosine vector V i of the first predetermined integer. An inverse discrete cosine vector step of obtaining according to the following equation; After the inverse discrete cosine vector step, the inverse discrete cosine vector (V i ), the window wing vector (D i ), and the window vector of the previous (n-1) block ( Window vector of the current (n) block of the sixth constant from ) And the window vector step, Is the remainder after dividing i by a multiple of p, where% is the remainder operator.) When the vector columns composed of the window vectors consecutive with the first integer are the fifth integer, A storage step of sequentially storing the last vector sequence in the PCM output buffer; An initialization step of initializing the position of the window vector remaining after moving all the vector sequences not yet stored to the position of the empty window vector after the vector sequence is stored in the PCM output buffer; And an output step of outputting the vector strings stored in the PCM output buffer to the PCM samples after the initialization step. 제1항에 있어서, 상기 역이산코사인벡터단계 및 상기 윈도우벡터단계는 상기 제1소정수는 32개이고, 상기 제2소정수는 2048개이고, 상기 제3소정수는 32개이고, 상기 제4소정수는 16개이고, 상기 제5소정수는 128개이고, 상기 제6소정수는 512개로서, 상기 역이산코사인벡터를 구하는데 필요한 곱셈의 횟수가 제6소정수인 것을 특징으로 하는 디지탈 오디오필터링방법.The method of claim 1, wherein the inverse discrete cosine vector step and the window vector step are 32 first constants, 2048 second constants, 32 third constants, and 4th constants. Is 16, the fifth constant is 128, the sixth constant is 512, and the number of multiplications required to obtain the inverse discrete cosine vector is a sixth constant. 제1항에 있어서, 상기 윈도우드벡터단계는 상기 인자 i가 상기 제1소정수의 짝수배인 상기 역이산코사인벡터들을 상기 인자 i가 0인 역이산코사인벡터로 나타내는 것을 특징으로 하는 디지탈 오디오필터링방법.The digital audio filtering according to claim 1, wherein the window vector step represents the inverse discrete cosine vectors whose factor i is an even multiple of the first predetermined number as an inverse discrete cosine vector whose factor i is zero. Way. 부호화된 디지탈 오디오데이타를 입력하여 부가정보를 복호화하는 복호화수단과, 상기 복호화된 샘플을 역양자화하여 부밴드표본을 저장하는 제1기억수단 및 상기 역양자화된 부밴드표본이 표본이 저장되어 있는 주소를 발생하는 주소발생수단을 포함하는 역양자화수단과, 상기 부밴드표본을 입력하여 역이산코사인변환하여 윈도우드벡터를 만든 다음 PCM샘플을 출력하는 오디오필터링수단을 포함하는 디지탈 오디오복호기에 있어서, 상기 오디오 필터링수단은 역이산코사인변환계수(Nik: 여기서 i와 k는 상기 역이산코사인변환계수가 저장된 주소를 지정하기 위한 인자임)와 윈도윙벡터를 저장하고 있는 제2기억수단; 상기 역이산코사인변환계수와 상기 부밴드표본을 입력받아 상기 역이산코사인변환벡터를 구하고, 상기 윈도윙벡터와 상기 역이산코사인변환벡터 및 이전 블럭의 윈도우드벡터를 입력받아 현재의 윈도우드벡터를 구하기 위해 연산을 수행하는 연산수단; 상기 주소발생부가 부밴드표본을 발생하도록 제어하고, 상기 역이산코사인변환계수와 상기 윈도윙벡터가 상기 연산수단에 입력되도록 제어하고, 상기 연산을 제어하는 제어수단을 구비하는 것을 특징으로 하는 디지탈 오디오필터링장치.Decoding means for inputting encoded digital audio data to decode additional information, first storage means for inversely quantizing the decoded sample and storing a subband sample, and an address in which a sample is stored in the dequantized subband sample A digital audio decoder comprising: an inverse quantization means including an address generating means for generating a; and an audio filtering means for inputting the subband sample to inverse discrete cosine transform to form a window vector and then outputting a PCM sample; second memory means for storing the windowed vector; audio filtering means is an inverse discrete cosine transform coefficients (where i and k is the inverse factor for specifying the address of the discrete cosine transform coefficients being stored N ik) The inverse discrete cosine transform coefficient and the subband sample are input to obtain the inverse discrete cosine transform vector, and the window wing vector, the inverse discrete cosine transform vector, and the window vector of the previous block are input to obtain a current window vector. Computing means for performing an operation to obtain; And a control means for controlling the address generator to generate a subband sample, controlling the inverse discrete cosine transform coefficient and the windowing vector to be input to the calculation means, and controlling the calculation. Filtering device. 제4항에 있어서, 상기 제2기억수단은 상기 역이산코사인변환계수를 저장하는 제3기억수단; 상기 윈도윙벡터를 저장하는 제4기억수단을 구비하는 것을 특징으로 하는 디지탈필터링장치.5. The apparatus of claim 4, wherein the second storage means comprises: third storage means for storing the inverse discrete cosine transform coefficients; And a fourth storage means for storing the window wing vector. 제4항에 있어서, 상기 제어수단은 상기 역이산코사인변환벡터를 구하기 위해 필요한 상기 인자 i와 k의 값을 계산하여 상기 주소발생부로 공급하고, 상기 제2 및 제3기억수단의 주소를 지정하고, 상기 연산수단을 제어하는 제1제어수단; 상기 연산수단을 제어하는 제2제어수단을 구비하는 것을 특징으로 하는 디지탈 필터링장치.5. The apparatus of claim 4, wherein the control means calculates and supplies values of the factors i and k necessary to obtain the inverse discrete cosine transform vector, and specifies the addresses of the second and third storage means. First control means for controlling the calculation means; And a second control means for controlling said calculating means. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940030042A 1994-11-16 1994-11-16 Apparatus and method for filtering digital audio KR0138300B1 (en)

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