Efficient encoding method, efficient code decoding method, effic

Details Efficient encoding method, efficient code decoding method, effic Efficient encoding method, efficient code decoding method, effic

1995-05-01

2000-08-15

Young, Brian

Coded data generation or conversion

Digital code to digital code converters

H03M 700

Patent

active

061043214

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to encoding and decoding of digital speech signals, and more particularly to a system for carrying out efficient encoding and/or decoding by making use of the hearing sense characteristic of the human being with respect to digital speech signals of a plurality of channels. More specifically, this invention relates to a stereo acoustic system for broadcasting, communication, cinema, video tape recorder or disc player, or a multiple surround acoustic system comprised of three channels or more.
Further, this invention relates to an efficient encoding method for reducing bit rate, which is suitable for use in these systems, and an efficient code decoding method and an efficient code decoding/reproducing method, which correspond to the above-mentioned efficient encoding method.
Furthermore, this invention relates an efficiently encoded signal recording method for recording signals encoded by such efficient encoding method, and recording media to which recording has been implemented.
In addition, this invention relates to an efficiently encoded signal transmission method for transmitting signals encoded by such efficient encoding method.


BACKGROUND ART

As the efficient encoding method and the efficient encoding apparatus for musical signals, or audio signals such as speech signals, etc., a large number of technologies are known.
For example, as one method thereof, there is a blocking frequency band division system of dividing an audio signal in the time region into blocks every predetermined unit time along the time axis to orthogonally transform signals in the time region every respective blocks into signals in the frequency region to further divide them into signal components in a plurality of frequency bands to carry out re-quantization/encoding thereof every respective frequency bands. This system is generally called Transform Coding.
This method has been already filed as a patent application by the inventors and the applicant of this application, and is disclosed in, e.g., U.S. Pat. Specification No. 5,301,205.
As another method, there is non-blocking frequency band division method of dividing an audio signal in the time region into signal components in plural, e.g., about 20 frequency bands without carrying out blocking every unit time to encode them. In general, method called Sub Band Coding (SBC) is known. For example, such method is disclosed in U.S. Pat. Specification No. 4,896,362 and U.S. Pat. Specification No. 5,105,463.
Further, there are also proposed an efficient encoding method and an efficient encoding apparatus in which the Sub Band Coding and the Transform Coding described above are combined. This system is a method of carrying out band division by the Sub Band Coding thereafter to orthogonally transform signals every respective bands into signals in the frequency region to implement coding to the orthogonally transformed signals every respective bands.
As this method, there is a method disclosed in, e.g., U.S. Pat. Specification No. 4,972,484.
Here, as band division filter of the above-described Sub Band Coding, there is a filter, e.g., Quadrature Mirror Filter (QMF), etc. This 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, method and apparatus for filter division of equal bands are described.
Moreover, as the above-described orthogonal transform method, there is known a method of dividing an input audio signal into blocks every predetermined unit time (frame) to carry out, every blocks, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), or Modified Discrete Cosine Transform (MDCT), etc. to thereby transform signals on the time base into signals on the frequency base.
In the embodiment of this application, MDCT is used as orthogonal transform processing. This MDCT is described in ICASSP 1987 Subband/Transform Coding Using Filter Bank Designs Based on Ti

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