Patent EP0420745A2 successfully refreshed from Google Patents.
EP0420745A2
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EP
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Digital signal encoding apparatus
Assignee: Sony Corp
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Filing: 1990-09-25
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Granted: —
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Expires: 2010-09-25
Abstract
Abstract This invention relates to a digital signal encoding apparatus in which the width of the range (B3,B4) is selected to be wider for the higher frequency range of the digital signals divided into a plurality of regions (B1,B2,B3,B4) and in which the encoded signals are synthesized for the respective ranges, wherein encoding is controlled as a function of the output detecting the characteristics of the components of the divided frequency ranges and the detection time interval is selected to be longer for the lower frequency to enable more efficient encoding to be performed as a function of the properties of input digital signals.
Inventors
- 👤 Yoshihito Fujiwara
- 👤 Tomoko Umezawa
- 👤 Masayuki Nishiguchi
- 👤 Makoto Akune
- 👤 Naoto Iwahashi
- 👤 Kenzo Akagiri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 11:08
CPC Classifications
H; H03; H03M; H03M7/00; H04; H04B; H04B1/00; H04B1/66; H04B1/667; H04B1/665
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A digital signal encoding apparatus in which input digital signals are divided into a plurality of frequency bands (B1 to B4) which are so set that the bands (B3,B4) with higher frequencies will have broader bandwidths, and in which encoded signals are synthesized and outputted for each of said frequency bands (B1 to B4), characterized in that properties of the frequency components of the frequency bands (B1 to B4) are detected by detecting means (21 to 24) and encoding is controlled by control means (31 to 34, 41 to 44) as a function of the detection output, and in that the detection time duration is selected to be longer for lower frequencies.
Claim 2
Dependent Claim
112 words
A digital signal encoding apparatus in which input digital signals are divided into a plurality of frequency bands (B1 to B4) which are so set that the bands (B3,B4) with higher frequencies will have broader bandwidths, and in which encoded signals are synthesized and outputted for each of said frequency bands (B1 to B4), characterized in that properties of the frequency components of the frequency bands (B1 to B4) are detected by detecting means (21 to 24) and encoding is controlled by control means (31 to 34, 41 to 44) as a function of the detection output, and in that the detection time duration is selected to be longer for lower frequencies.
Claim 3
Dependent Claim
65 words
The digital signal encoding apparatus according to claim 1, characterized in that said means for detecting the characteristics of the frequency components of the frequency bands includes spectrum analysis means (21 to 24) and in that the frequency of clock signals (1/8)CK, (1/4)CK, (1/2)CK, CK for controlling said analysis means (21 to 24) is selected to be lower for clock signals for lower frequency bands.
Claim 4
Dependent Claim
75 words
A high efficiency digital data encoding apparatus, characterized in that input digital data are divided into a plurality of bands (B1 to B4) so that the handwidths thereof will become progressively broader for higher frequency ranges, a plurality of blocks each consisting of a plurality of samples are formed for each said band (B1 to B4) and in that orthogonal transform (105,...105₅) is performed for each said block of the band to generate coefficient data.
Claim 5
Dependent Claim
75 words
A high efficiency digital data encoding apparatus, characterized in that input digital data are divided into a plurality of bands (B1 to B4) so that the handwidths thereof will become progressively broader for higher frequency ranges, a plurality of blocks each consisting of a plurality of samples are formed for each said band (B1 to B4) and in that orthogonal transform (105,...105₅) is performed for each said block of the band to generate coefficient data.
Claim 6
Dependent Claim
32 words
The apparatus according to claim 3, characterized in that the block in which said orthogonal transform is performed is composed of the same numbers of the sample data for the respective bands.
Claim 7
Dependent Claim
130 words
A high efficiency encoding apparatus for digital data, wherein input digital data are converted into data on the frequency axis, the data of respective bands (B1 to B25) are formed into blocks by selecting the bandwidths to be broader for the high frequency ranges to compute the floating coefficients for the respective blocks, the floating operation for the respective blocks is performed with said floating coefficients and the floating coefficients are quantized, characterized in that the numbers of the data in each block are selected to be approximately equal, and in that means (...218 25.1 ,...218 25.K ) for quantizing the floating coefficients for the high frequency range quantize said floating coefficients with numbers of bits (2) which are progressively smaller for the floating coefficients of the higher frequency range.
Claim 8
Dependent Claim
130 words
A high efficiency encoding apparatus for digital data, wherein input digital data are converted into data on the frequency axis, the data of respective bands (B1 to B25) are formed into blocks by selecting the bandwidths to be broader for the high frequency ranges to compute the floating coefficients for the respective blocks, the floating operation for the respective blocks is performed with said floating coefficients and the floating coefficients are quantized, characterized in that the numbers of the data in each block are selected to be approximately equal, and in that means (...218 25.1 ,...218 25.K ) for quantizing the floating coefficients for the high frequency range quantize said floating coefficients with numbers of bits (2) which are progressively smaller for the floating coefficients of the higher frequency range.
References Cited (Backward Citations)
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