KR950010637A - Subband coding method for the hearing loss - Google Patents

Subband coding method for the hearing loss Download PDF

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Publication number
KR950010637A
KR950010637A KR1019930019214A KR930019214A KR950010637A KR 950010637 A KR950010637 A KR 950010637A KR 1019930019214 A KR1019930019214 A KR 1019930019214A KR 930019214 A KR930019214 A KR 930019214A KR 950010637 A KR950010637 A KR 950010637A
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subband
signal
signals
encoding
sub
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KR1019930019214A
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KR960016814B1 (en
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박상규
장현식
안치득
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양승택
재단법인 한국전자통신연구소
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/65—Purpose and implementation aspects
    • H03M13/6522—Intended application, e.g. transmission or communication standard

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

Abstract

본 발명은 난청자용 오디오 신호를 발송하기 위한 부호화 방법에 관한 것으로, 디틀 오디오 신호를 입력하여 입력된 신호들에 대해 고속 푸리에 변환을 수행하여 입력된 신호들의 주파수 성분값을 구하고, 다른 한편으로는 입력된 신호들에 대해 서브밴드 필터링을 행한 후 신호 처리를 행한 후 동일 주파수 대역의 각 서브밴드에 속하는 신호들을 계산하는 제1단계(4 내지 6, 12), 상기 제1단계(4 내지 6, 12) 수행후, 다음 각 서브밴드에 속하는 신호들중 최대값을 찾아내어 주파수 성분 값들과 서브밴드별 신호를 중 최대값을 이용하여 신호가 인간의 청각에 감지되지 않는 레벨을 나타내는 차단 문턱값을 서브밴드별로 계산하여 양자화 비트를 할당 한 다음 다중화하여 전송을 하기 위한 단일 비트 열 형태로 만들어 새로운 오디오 입력 신호가 나타나지 않을 때까지 반복 수행하는 제2단계(8 내지 11)로 이루어지는 것을 특징으로 한다.The present invention relates to an encoding method for transmitting an audio signal for a hearing loss, and inputs a beatle audio signal to perform fast Fourier transform on the input signals to obtain frequency component values of the input signals, and on the other hand, A first step (4 to 6, 12) and a first step (4 to 6, 12) of calculating signals belonging to each subband of the same frequency band after performing subband filtering on the received signals. Next, find the maximum value among the signals belonging to each of the following subbands, and use the maximum value of the frequency component values and the signal for each subband to subtract the blocking threshold indicating the level at which the signal is not detected by the human hearing. Calculate band-by-band, assign quantization bits, then multiplex to form a single bit string for transmission so that no new audio input signals appear. It characterized by comprising a second stage (8 to 11) for performing repeated until.

Description

난청자용 서브밴드 부호화 방법Subband coding method for the hearing loss

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

제1도는 일반적인 오디오 방송 시스템의 구성도.1 is a block diagram of a general audio broadcasting system.

제2도는 종래의 서브밴드 부호화 방법에 대한 처리 흐름도.2 is a processing flowchart of a conventional subband encoding method.

제3도는 본 발명에 의한 난청자용 서브밴드 부호화 방법에 대한 처리 흐름도.3 is a flowchart illustrating a method for subband coding for hearing loss according to the present invention.

제4도는 본 발명에 따른 난청자용 신호처리에 대한 흐름도.4 is a flow chart for signal processing for the hearing loss according to the present invention.

제5도는 본 발명에 의한 난청자용 신호처리에서 사용하는 가중치 예시도.5 is an exemplary diagram of weights used in the signal processing for the hearing loss according to the present invention.

Claims (2)

아날로그 오디오 신호를 디지틀 오디오 신호로 변환시켜 주는 A/D 변환수단(1), 상기 A/D 변환수단(1)에 연결되어 입력된 디지틀 오디오 신호를 부호화하는 오디오 부호화수단(2), 상기 오디오 부호화수단(2)에 연결되어 부호화 결과 값을 전송하는 전송수단(3)을 구비하는 오디오 방송 시스템에 적용되는 난청자용 서브밴드 부호화에 있어서, 디지틀 오디오 신호를 입력하여 입력된 신호들에 대해 고속 푸리에 변환을 수행하여 입력된 신호들의 주파수 성분값을 구하고, 다른 한편으로는 입력된 신호들에 대해 서브밴드 필터링을 행한 후 신호처리를 행한 후 동일 주파수 대역의 각 서브밴드에 속하는 신호들을 계산하는 제1단계(4 내지 6,12), 상기 제1단계(4 내지 6,12) 수행 후, 다음 각 서브밴드에 속하는 신호들중 최대값을 찾아내어 주파수 성분 값들과 서브밴드별 신호들 중 최대값을 이용하여 신호가 인간의 청각에 감지되지 않는 레벨을 나타내는 차단 문턱값을 서브밴드별로 계산하여 양자화 비트를 할당 한 다음 다중화하여 전송을 하기 위한 단일 비트 열형태로 만들어 새로운 오디오 입력 신호가 나타나지 않을 때까지 반복 수행하는 제2단계(8 내지 11)로 이루어지는 것을 특징으로 하는 난청자용 서브밴드 부호화 방법.A / D conversion means (1) for converting an analog audio signal into a digital audio signal, audio encoding means (2) connected to the A / D conversion means (1) for encoding an input digital audio signal, and the audio encoding In the sub-band encoding for hearing loss applied to an audio broadcasting system having a transmission means (3) connected to the means (2) and transmitting an encoding result value, a fast Fourier transform on input signals by inputting a digital audio signal Performing a subband filtering on the input signals, performing signal processing, and then calculating signals belonging to each subband of the same frequency band (4 to 6,12), after performing the first steps (4 to 6,12), the maximum value of the signals belonging to each of the following subbands is found and the frequency component values and the sub By using the maximum value of each signal, a threshold for the level at which the signal is not detected by the human hearing is calculated for each subband, the quantization bits are allocated, and then multiplexed into a single bit string for transmission. And a second step (8 to 11) which repeatedly performs until the input signal does not appear. 제1항에 있어서, 상기 제1단계(4 내지 6,12)에서 난청자용 신호처리과정은; 초기에 처리하려는 첫번째 서브밴드의 신호들을 입력한 다음 첫번째 서브밴드에 해당하는 가중치 W(1)을 입력하는 제1과정(20 내지 22), 상기 제1과정(20 내지 22) 수행 후, 첫번째 서브밴드의 신호들에 대해 가중치를 곱하고 가중치가 부여된 결과값을 다음 처리를 위해 저장하고 다음의 서브밴드에 대해서 동일한 과정을 반복수행하여 32개의 서브밴드에 대해서 가중치를 곱하고 종료하는 제2과정(23 내지 29)으로 이루어지는 것을 특징으로 하는 난청자용 서브밴드 부호화 방법.The method of claim 1, wherein the first step (4 to 6, 12) signal processing for hearing loss; After inputting the signals of the first subband to be initially processed and then inputting the weight W (1) corresponding to the first subband, the first sub 2020 to the first sub 2020, and then the first sub 2020 A second process of multiplying the weights of the signals of the band, storing the weighted result for the next processing, repeating the same process for the next subband, and multiplying the weights of the 32 subbands and ending (23). To 29) a subband encoding method for a hearing impaired. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930019214A 1993-09-21 1993-09-21 Sub band coding method for a poor hearer KR960016814B1 (en)

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KR960016814B1 KR960016814B1 (en) 1996-12-21

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