EP0540177A2
Expired / Lapsed
EP
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Information transmission method and apparatus
Assignee: Canon Inc
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Filing: 1992-09-30
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Granted: —
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Expires: 2012-09-30
Abstract
Abstract In an information transmission method and apparatus, information is transmitted in units of a block including information codes and error-correcting check codes, and the transmission speed is switched by changing the number of blocks to be transmitted per unit time without changing the amount of information of the information codes and the amount of information of the error-correcting check codes within each block.
Inventors
- 👤 Hiroshi c/o Canon Kabushiki Kaisha Takizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:20
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; H04L1/0041; H04N; H04N1/00; H04N1/00095; H04N1/32; H04N1/333; H04N1/41; H04N1/411; H04N1/413; H04N1/417
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
An information transmission method in which transmission speed of information is switched, said method comprising the steps of: transmitting information in units of a block including information codes and error-correcting check codes at one of a plurality of transmission speeds; and switching from one transmission speed to another by changing a number of blocks to be transmitted per unit time without changing an amount of information of the information codes and the amount of information of the error-correcting check codes within each block.
Claim 2
Dependent Claim
29 words
A method according to Claim 1, wherein each information code comprises a code obtained by performing variable-length encoding of an image signal for every predetermined number of picture elements.
Claim 3
Dependent Claim
68 words
A method according to Claim 1, wherein the number of blocks is changed so that a ratio of the number of blocks before the change to the number of blocks after the change is equal to a ratio of a total amount of codes to be transmitted per unit time before the change to a total amount of codes to be transmitted per unit time after the change.
Claim 4
Dependent Claim
80 words
An information transmission apparatus, comprising: means for establishing a first transmission mode for transmitting a first predetermined number of blocks per unit time, each block including a predetermined amount of information codes and a predetermined amount of error-correcting check codes; and means for establishing a second transmission mode for transmitting a second predetermined number, different from said first predetermined number, per unit time of blocks including said predetermined amount of information codes and said predetermined amount of error-correcting check codes.
Claim 5
Dependent Claim
29 words
An apparatus according to Claim 4, wherein each information code comprises a code obtained by performing variable-length encoding of an image signal for every predetermined number of picture elements.
Claim 6
Dependent Claim
60 words
An apparatus according to Claim 4, wherein said apparatus is controlled so that a ratio of said first predetermined number to said secnd predetermined number equals a ratio of a total amount of codes to be transmitted per unit time in said first mode to a total amount of codes to be transmitted per unit time in said second mode.
Claim 7
Dependent Claim
90 words
An image transmission apparatus, comprising: variable-length encoding means for forming information codes by performing variable-length encoding of an image signal; dividing means for dividing the information codes into blocks for every predetermined amount of codes; error-correcting encoding means for generating check codes for forming error-correcting codes for respective information codes divided by said dividing means; synthesis means for synthesizing the divided information codes and the check codes and outputting synthesized blocks of data; and control means for controlling a number of said blocks of block data output per unit time.
Claim 8
Dependent Claim
19 words
An apparatus according to Claim 7, wherein said variable-length encoding means includes quantization means for quantizing the image signal.
Claim 9
Dependent Claim
25 words
An apparatus according to Claim 8, wherein a quantization coefficient of said quantization means is determined by said variable-length encoding means and said control means.
Claim 10
Dependent Claim
59 words
An information transmission method comprising transmitting information in units of a block including information codes and error-correcting check codes, and switching the transmission speed by changing the number of blocks to be transmitted per unit time without changing the amount of information of the information codes and the amount of information of the error-correcting check codes within each block.
Claim 11
Dependent Claim
63 words
An information transmission apparatus, comprising means for transmitting information in units of a block including information codes and error-correcting check codes, and means for switching the transmission speed by changing the number of blocks to be transmitted per unit time without changing the amount of information of the information codes and the amount of information of the error-correcting check codes within each block.
References Cited (Backward Citations)
No citation records indexed.
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