Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1995-04-17
1998-06-09
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704268, 704269, 704500, G10L 706
Patent
active
057651264
DESCRIPTION:
BRIEF SUMMARY
This is related to co-pending application 08/374,518, filed Mar. 20, 1995 and entitled Method, Apparatus and Recording Medium for Coding Separated Tone and Noise Characteristic Spectral Components of an Acoustic Signal U.S. Pat. No. 5,717,821.
TECHNICAL FIELD
This invention relates to a signal encoding apparatus to which such an encoding of information such as digital signal data, etc. to efficiently encode a digital signal such as input digital data, etc. to transmit or record the encoded digital signal is applied, a signal recording medium adapted so that signals encoded by such signal encoding apparatus are recorded, and a signal decoding apparatus to which such a decoding of information such as digital data, etc. to decode an encoded signal reproduced from a recording medium as mentioned above or transmitted from a signal encoding apparatus as mentioned above to obtain a reproduction signal is applied.
BACKGROUND ART
Hitherto, there are various efficient encoding techniques for audio signals or speech signals, etc. As the representative thereof, there can be enumerated band division coding (Sub Band Coding (SBC)) which is non-blocking frequency band division system to divide an audio signal, etc. on the time base into signal components in a plurality of frequency bands every predetermined unit time without implementing blocking thereto to encode them, so called transform coding which is the blocking frequency band division system to divide a signal on the time base into blocks every predetermined unit time to transform respective signals on the time base into signals on the frequency base every respective blocks (spectrum transform processing) to divide signals transformed in this way into signal components in a plurality of frequency bands to encode them every respective frequency bands, and the like. Moreover, there has been also already proposed efficient coding technique in which the band division coding and the transform coding described above are combined. In this case, for example, a signal on the time base is divided into signals in a plurality of bands by the above-mentioned band division coding thereafter to spectrum-transform the signals every respective bands into signals on the frequency base to implement coding to the spectrum-transformed signals every respective bands.
Here, as a filter for the band division used in the above-mentioned band division coding technique, or the above-mentioned combined efficient coding technique, etc., there is a filter, e.g., so called QMF, etc. Such a filter is described in, e.g., 1976 R. E. Crochiere Digital coding of speech in subbands Bell Syst. Tech. J. Vol. 55, No. 8 1976.
Moreover, filter division technique of equal bandwidth is described in, e.g., ICASSP 83, BOSTON Polyphase Quadrature filters--A new subband coding technique Joseph H. Rothweiler.
Further, for the above-described spectrum transform processing, there is, e.g., such a spectrum transform processing to divide an input audio signal into blocks every predetermined unit time (frame) to carry out Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT) or Modified DCT Transform (MDCT), etc. every respective blocks thus to transform signals on the time base into signals on the frequency base. The above-mentioned MDCT is described in ICASSP 1987 Subband/Transform Coding Using Filter Bank Designs Based on Time Domain Aliasing Cancellation J. P. Princen A. B. Bradley Univ. of Surrey Royal Melbourne Inst. of Tech.
By quantizing signals divided every bands by filter or spectrum transform processing in this way, it is possible to control bands where quantizing noises take place, and to carry out more efficient coding from a viewpoint of the hearing sense by making use of the property of the masking effect, etc. Moreover, in this case, when an approach is employed to carry out normalization, every respective bands, e.g., by maximum value of absolute values of signal components in respective corresponding bands prior to implementation of quantization, further efficient coding can be ca
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Sonohara Mito
Tsutsui Kyoya
Hudspeth David R.
Smits Talivaldis Ivars
Sony Corporation
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