Source: http://www.google.com/patents/US6169973?dq=patent:6144888
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Patent US6169973 - Encoding method and apparatus, decoding method and apparatus and recording ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn encoding method and apparatus and a decodings method and apparatus in which the encoded information is decreased in volume and in which the encoding and decoding operations are performed with a smaller processing volume and a smaller buffer memory capacity. The apparatus includes a low range signal...http://www.google.com/patents/US6169973?utm_source=gb-gplus-sharePatent US6169973 - Encoding method and apparatus, decoding method and apparatus and recording mediumAdvanced Patent SearchPublication numberUS6169973 B1Publication typeGrantApplication numberUS 09/048,150Publication dateJan 2, 2001Filing dateMar 25, 1998Priority dateMar 31, 1997Fee statusPaidAlso published asCA2233521A1, CA2233521C, CN1104689C, CN1197958A, DE69837738D1, DE69837738T2, EP0875999A2, EP0875999A3, EP0875999B1Publication number048150, 09048150, US 6169973 B1, US 6169973B1, US-B1-6169973, US6169973 B1, US6169973B1InventorsKyoya Tsutsui, Osamu ShimoyoshiOriginal AssigneeSony CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (49), Non-Patent Citations (17), Referenced by (35), Classifications (21), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetEncoding method and apparatus, decoding method and apparatus and recording mediumUS 6169973 B1Abstract An encoding method and apparatus and a decodings method and apparatus in which the encoded information is decreased in volume and in which the encoding and decoding operations are performed with a smaller processing volume and a smaller buffer memory capacity. The apparatus includes a low range signal splitting circuit for separating low-range side signal components from L and R channel signals converted by a transform circuit into spectral signal components, and a channel synthesis circuit for synthesizing (L+R) channel signal components from the L and R channel spectral signal components. The apparatus also includes a high range signal separating circuit for separating the high range side signal components from the (L+R) channel signal components, a signal component encoding circuit for compression-encoding low-range side signal components and a signal component encoding circuit for compression-encoding the normalization coefficient information obtained on normalization of the (L+R) channel high-range signal components.
Among the above-mentioned filters is a so-called QMF (Quadrature Mirror Filter) filter as discussed in 1976, R. E. Crochiere, Digital Coding of Speech in subbands, Bell Syst. Tech. J. Vol. 55, No. 8, 1976. This QMF filter splits the frequency spectrum into two bands of equal bandwidths and is characterized in that so-called aliasing is not produced on. subsequently synthesizing the split bands. The technique of dividing the frequency spectrum is discussed in Joseph H. Rothweiler, Polyphase Quadrature Filters�A New Subband Coding Technique, ICASSP 83 BOSTON. This polyphase quadrature filter is characterized in that the signal can be split at a time into plural bands of equal band-width.
For example, in R. Zelinsky and P. Noll, �Adaptive Transform Coding of Speech Signals� and in �IEEE Transactions of Acoustics, Speech and Signal Processing, vol. ASSP-25, No. 4, August 1977, bit allocation is performed oil the basis of the magnitude of the band-based signals. With this system, the quantization noise spectrum becomes flat, such that the quantization noise is minimized. However, the actual noise feeling is not psychoacoustically optimum because the psychoacoustic masking effect is not exploited.
In a publication �ICASSP 1980, �The critical band coder�digital encoding of the perceptual requirements of the auditory system, M. A. Krasner, MIT�, the psychoacoustic masking mechanism is used to determine a fixed bit allocation that produces the necessary signal-to-noise ratio for each critical band. However, if this technique is used to measure characteristics of a sine wave input, non-optimum results are obtained because of the fixed allocation of bits among the critical bands.
There is also known a method of using variable length codes for encoding for realization of more efficient encoding of quantized spectral signal components, as described in D. A. Huffman, �A Method for Construction of Minimum Redundancy Codes�, in Proc. I. R. E., 40, p. 1098 (1952).
The above-described encoding techniques can be applied to respective channels of acoustic signals constructed by plural channels. For example, the encoding techniques can be applied to each of the left channel associated with a left-side speaker and the right channel associated with a right-side speaker. The L and R channels of the audio signals are known to be correlated to each other such that this correlation can be used to realize encoding with a higher efficiency. For example, there is described in the publication �Perceptual Transform Coding of Wideband Stereo Signals�, James D. Johnston, ICSSSP89, picture processing. 1993 to 1995) a technique of taking a sum and a difference of the input L, and R channels, converting these into spectral signals, finding a masking curve from the spectrum of the sum and quantizing the spectrum of the sum and that of the difference using the masking curve to achieve encoding. Since in general it occurs frequently that the L-channel signals are similar to the R-channel signals, the signal level of the channel corresponding to (L−R) is rather low such that it be encoded with a relatively small number of bits. It is an ancillary merit of this technique that monaural signals can be reproduced by reproducing only the signals of the channel corresponding to (L+R).
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a encoding method and apparatus for encoding multi-channel acoustic signals, a decoding method and apparatus for decoding the encoded information and a recording medium in which the volume of the encoding information can be decreased and in which encoding and decoding can be achieved with a smaller volume of the buffer memory.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing an illustrative structure of a recording/reproducing apparatus as an embodiment of the compressed data recording/reproducing apparatus according to the present invention.
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ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TSUTSUI, KYOYA;SHIMOYOSHI, OSAMU;REEL/FRAME:009293/0416;SIGNING DATES FROM 19980622 TO 19980624RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google