KR940017237A - Adaptive Bit Allocation for Subband Encoder - Google Patents

Adaptive Bit Allocation for Subband Encoder Download PDF

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KR940017237A
KR940017237A KR1019920024469A KR920024469A KR940017237A KR 940017237 A KR940017237 A KR 940017237A KR 1019920024469 A KR1019920024469 A KR 1019920024469A KR 920024469 A KR920024469 A KR 920024469A KR 940017237 A KR940017237 A KR 940017237A
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subband
average power
bit allocation
bit
calculator
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KR100246376B1 (en
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이승훈
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이헌조
주식회사 금성사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 서브밴드 부호화기의 적응비트 할당장치에 관한 것으로, 종래에는 비트할당을 위해 입력의 최대치를 선정 스케일링팩터(Scaling factor)로 활용하여 각 서브밴드신호를 스케일링한 후 재양자화함으로써 이 신호를 복조할때에도 스케일링 팩터가 부속정보로 필요하게 됨으로 이 스케일링 팩터를 항상 오디오 데이터와 함께 채널에 전송해야 함으로 전송효율이 떨어지게 되는 문제점이 있었다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adaptive bit allocation apparatus for a subband encoder, and conventionally demodulates this signal by scaling and then requantizing each subband signal by using a maximum input value as a predetermined scaling factor for bit allocation. Even when the scaling factor is needed as ancillary information, this scaling factor has to be transmitted to the channel with audio data at all times, thereby reducing the transmission efficiency.

따라서 종래의 문제점을 해결하기 위하여 본 발명은 할당가능한 비트를 둘로 나누어 하는 서브밴드 평균전력의 통계치에 따라 비트할당을 하고 다른 하나는 최대치와 평균치의 편차가 큰 것들의 분포에 따라 비트를 할당한 다음 이 두개를 합하여 전체비트 할당정보로 활용하여 전송효율을 높이도록 한 효과가 있다.Therefore, in order to solve the conventional problem, the present invention allocates bits according to the statistics of subband average power, which divides the assignable bits into two, and the other allocates the bits according to the distribution of the maximum and average deviations. It is effective to increase the transmission efficiency by using the two as total bit allocation information.

Description

서브밴드 부호화기의 적응비트 할당장치Adaptive Bit Allocation for Subband Encoder

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

제3도는 본 발명 서브밴드 보호화기의 적응비트 할당장치 구성도, 제4도는 제3도에 있어서, 평균전력 및 최대 전압검출기의 상세블럭도.FIG. 3 is a block diagram of an adaptive bit allocation device of the subband protector of the present invention, and FIG. 4 is a detailed block diagram of average power and maximum voltage detector of FIG.

Claims (3)

입력되는 오디오 또는 음성신호를 서브밴드로 분할하는 서브밴드필터(11)와, 상기 서브밴드필터(11)의 서브밴드신호로부터 평균치와 최대치를 구하는 평균전력 및 최대전압검출기(12)와, 상기 평균전력 및 최대전압검출기(12)를 통해 검출된 평균전력과 최대전압으로 각 서브밴드에 할당되는 비트수를 결정하는 비트할당기(13)와, 상기 비트할당기(13)를 통해 할당된 비트수에 따라 각 서브 밴드신호를 재양자화하는 서브밴드양자화기(14)와, 상기 서브밴드양자화기(14)를 통해 재양자화된 서브밴드신호와 비트할당정보를 순차적으로 송신채널에 전송하는 멀티플렉서(15)로 구성된 서브밴드 부호화기의 적응비트 할당장치.A subband filter 11 for dividing an input audio or audio signal into subbands, an average power and maximum voltage detector 12 for obtaining an average value and a maximum value from the subband signal of the subband filter 11, and the average A bit allocator 13 for determining the number of bits allocated to each subband by the average power and the maximum voltage detected by the power and the maximum voltage detector 12, and the number of bits allocated through the bit allocator 13 The subband quantizer 14 requantizes each subband signal according to the multiplexer, and the multiplexer 15 sequentially transmits the requantized subband signal and bit allocation information to the transmission channel through the subband quantizer 14. Adaptive bit allocation apparatus of subband encoder composed of 제1항에 있어서, 평균전력 및 최대전압검출기(12)는 입력신호에 대해 소정갯수만큼 일시적으로 저장하는 버퍼(21)와, 상기 버퍼(21)에 저장된 소정갯수 신호의 평균치를 구하는 평균전력계산기(22)와, 입력신호에 대해 최대치를 구하는 최대치검출기(22)로 구성된 서브밴드 부호화기의 적응비트 할당장치.The method of claim 1, wherein the average power and maximum voltage detector 12 includes a buffer 21 for temporarily storing a predetermined number of input signals and an average power calculator for calculating an average value of the predetermined number of signals stored in the buffer 21. And an adaptation bit allocation apparatus for a subband encoder composed of a maximum value detector (22) for obtaining a maximum value for an input signal. 제1항에 있어서, 비트할당기(13)는 각 서브밴드의 평균전력을 입력신호의 평균전력으로 스케일링하는 평균전력비산출기(24)와, 상기 평균전력비산출기(24)의 평균전력비를 합하는 제2적분기(30)와, 상기 평균전력비산출기(24)의 평균전력비를 상기 제2적분기(30)를 통해 합산된 각 서브밴드의 평균전력비만큼 비트할당을 행하는 제1비트할당기(25)와, 각 서브밴드의 평균전력과 최대전압과를 차를 산출해내는 산출기(26)와, 상기 산출기(26)를 통한 평균전력 및 최대전압과의 차를 각각 합한 총 전력차를 더하는 제1적분기(27)와, 상기 산출기(26)를 통한 평균전력 및 최대전압과의 차를 제1적분기(27)의 충전력차를 기준으로 각 서브밴드의 비트할당을 계산하는 제2비트할당기(28)와, 상기 제1,2비트할당기(25)(28)의 비트값을 합한 비트할당 정보를 출력하는 합산기(29)로 구성된 서브밴드 부호화기의 적응비트 할당장치.2. The bit allocator (13) according to claim 1, wherein the bit allocator (13) adds an average power ratio calculator (24) for scaling the average power of each subband to the average power of the input signal and the average power ratio of the average power ratio calculator (24). A first bit allocator 25 for performing bit allocation by the average power ratio of each subband summed through the second integrator 30 with the average power ratio of the second integrator 30 and the average power ratio calculator 24; And a calculator 26 that calculates a difference between the average power and the maximum voltage of each subband, and a total power difference that adds up the total difference between the average power and the maximum voltage through the calculator 26, respectively. A second bit allocator for calculating bit allocation of each subband based on the difference between the average power and the maximum voltage through the calculator 26 and the charging power of the first integrator 27 (28) and a summer 29 for outputting bit allocation information obtained by adding the bit values of the first and second bit allocators 25 and 28. Adaptive bit allocation apparatus of subband encoder. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920024469A 1992-12-16 1992-12-16 Adaptive Bit Allocation for Subband Encoder Expired - Fee Related KR100246376B1 (en)

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KR100246376B1 KR100246376B1 (en) 2000-03-15

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