Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1995-06-22
1998-06-30
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704215, 704226, 704229, G10L 900
Patent
active
057748446
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an efficient encoding apparatus and to an efficient encoding method for carrying out reduction of bit rate, for use in cinema film projection systems or stereo or so called multi-surround acoustic systems such as video tape recorder or video disc player, etc., a quantizing apparatus and a quantizing method used in such encoding apparatus and method, recording media adapted so that signals quantized by such quantizing apparatus or efficient encoding apparatus are recorded thereonto or thereinto, an efficient code decoding apparatus for decoding quantized signals reproduced such recording media, and a decoding apparatus used in such an efficient code decoding apparatus.
BACKGROUND ART
There are various efficient encoding techniques and apparatuses for audio signals or speech signals, etc. For example, there is a transform encoding system which utilizes a blocking frequency band division system of dividing an audio signal, etc. in the time domain into blocks for every time unit transforming (orthogonally transform) signals in the time domain every respective blocks into signals on the frequency domain to divide such signals into signals (signal components) in a plurality of frequency bands to encode them every respective bands; a Sub Band Coding (SBC) system which is the non-blocking frequency band division system of dividing, every unit times, an audio signal, etc. in the time region into signals (signal components) in a plurality of frequency bands without carrying out blocking thereof to encode them, and the like. Moreover, there have been also proposed an efficient encoding technique and an efficient encoding apparatus in which the Sub Band Coding (SBC) system and the transform encoding system described above are combined. In this case, e.g., an approach is employed to carry out band division by the Sub Band Coding (SBC) thereafter to orthogonally transform signals every respective bands into signals in the frequency band by the transform encoding system to implement encoding to the orthogonally transformed signals every respective bands.
Here, as a filter for band division used in the above-described Sub Band Coding (SBC) system, there is, e.g., a filter such as QMF (Quadrature Mirror filter), etc. Such filter is described in 1976 R. E. Crochiere Digital coding of speech in subbands Bell Syst. Tech. J. Vol. 55, No. 8 1976. Moreover, in ICASSP 83, BOSTON Polyphase Quadrature filters-A new subband coding technique Joseph H. Rothweiler, a technique and an apparatus for band division using filter of equal bandwidth such as Polyphase Quadrature filter, etc. are described.
Further, as the above-described orthogonal transform processing, e.g., there is such an orthogonal transform processing to divide an input audio signal into blocks every predetermined unit time (frame) to carry out, every respective blocks, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), or Modified DCT (MDCT), etc. to thereby 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.
In addition, as a frequency division technique in the case of quantizing respective frequency components which have been caused to undergo frequency band division, there is, e.g., a band division in which the hearing sense characteristic of the human being is taken into consideration. Namely, there are instances where an audio signal is divided into signal components in plural (e.g., 25) bands by bandwidths such that according as frequency shifts to higher frequency band side, bandwidths become broader, which are generally called critical bands. Moreover, in encoding data every respective bands at this time, a predetermined bit allocation is carried out every respective bands, or an adaptive bit allocation is carried out every respective bands. Thus, encoding is carried o
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Chawan Vijay B.
Hudspeth David R.
Sony Corporation
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