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EP0448405A2
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EP
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Data communication apparatus using memory means for error detection
Assignee: Canon Inc
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Filing: 1991-03-22
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Granted: —
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Expires: 2011-03-22
Abstract
Abstract The present invention relates to a data communication apparatus having an error correction communication mode in half duplex operation and method. The data communication apparatus has a memory for storing a received data, and means which detects an overflow in the memory and presence of an error in the received data and requests re-sending in accordance with this detection result.
Inventors
- 👤 Takashi C/O Canon Kabushiki Kaisha Ono
- 👤 Yasuhide C/O Canon Kabushiki Kaisha Ueno
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 23:17
CPC Classifications
H; H04; H04L; H04L1/00; H04N; H04N1/00; H04N1/32; H04N1/32358; H04N1/32363; H04N1/32379; H04L1/12; H04L1/16; H04N1/32443; H04N1/32448; H04N1/32609; H04N1/32614; H04N1/32619; H04N1/327; H04N1/32795
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
68 words
A data communication apparatus having an error correcting communication mode in half-duplex operation, comprising: a memory for storing a received data, with a capacity not more than an amount of data to be transmitted in said error correcting communication mode; and means for detecting an overflow in said memory and presence of an error in the received data, and requesting for re-sending in accordance with the detection result.
Claim 2
Dependent Claim
24 words
The data communication apparatus according to Claim 1, wherein said memory is utilized for any memory communication other than said error correcting communication mode.
Claim 3
Dependent Claim
33 words
The data communication apparatus according to Claim 1, wherein an unused capacity of said memory is detected and error correcting communication is performed in accordance with the detected unused capacity of said memory.
Claim 4
Dependent Claim
31 words
The data communication apparatus according to Claim 1, further comprising means for recording received data, wherein storing received data in said memory is performed non-synchronously with recording data in said memory.
Claim 5
Dependent Claim
48 words
A data communication apparatus having an error correcting communication mode, comprising: a memory for storing a data; and control means for judging an unused capacity of said memory before data communication, and for controlling communication sequence of error correcting communication in accordance with a result of the judgement.
Claim 6
Dependent Claim
61 words
The data communication apparatus according to Claim 5, wherein said apparatus has at least a first error correcting communication mode and a second error correcting communication mode, and said control means selects either said first error correcting communication mode or said second error correcting communication mode in accordance with the result of the judgement of the unused capacity of said memory.
Claim 7
Dependent Claim
32 words
The data communication apparatus according to Claim 6, wherein said control means selects said first error correcting communication mode when the unused capacity of said memory is a specified capacity or more.
Claim 8
Dependent Claim
94 words
The data communication apparatus according to Claim 6, wherein said first error correcting communication mode is for detecting the presence of an error in the received data while one block data is being receive, and for requesting re-sending of data in accordance with the error detection result; and said second error correcting communication mode is for detecting an overflow in said memory and the presence of an error in the received data while one block data is being received and for requesting re-sending of data in accordance with the overflow and error detection results.
Claim 9
Dependent Claim
62 words
A data communication apparatus having an error correcting communication mode in half-duplex operation, comprising: a memory for storing data used for said error correcting communication; and control means for judgeing an unused capacity of said memory before data communication through error correcting communication, and for controlling the communication sequence of the error correcting communication in accordance with a result of the judgement.
Claim 10
Dependent Claim
61 words
The data communication apparatus according to Claim 9, wherein said apparatus has at least a first error correcting communication mode and a second error correcting communication mode, and said control means selects either said first error correcting communication mode or said second error correcting communication mode in accordance with the result of the judgement of the unused capacity of said memory.
Claim 11
Dependent Claim
32 words
The data communication apparatus according to Claim 10, wherein said control means selects said first error correcting communication mode when the unused capacity of said memory is a specified capacity or more.
Claim 12
Dependent Claim
93 words
The data communication apparatus according to Claim 10, wherein said first error correcting communication mode is for detecting the presence of an error in the received data while one block data is being received, and for requesting re-sending of data in accordance with the error detection result; and said second error correcting communication mode is for detecting an overflow in said memory and the presence of an error in the received data while one block data is being received and requests re-sending of data in accordance with the overflow and error detection results.
Claim 13
Dependent Claim
24 words
The data communication apparatus according to Claim 9, wherein said memory is used for any data memory communication other than said error correcting mode.
Claim 14
Dependent Claim
56 words
An error data detecting communication method using half-duplex operation, comprising steps of: judging an unused capacity of a memory for storing a data to be used for error correcting communication before data communication by an error correcting communication; and controlling communication sequence of the error correcting communication in accordance with a result of the judgement result.
Claim 15
Dependent Claim
56 words
An error data detecting communication method according to Claim 14, wherein said apparatus has at least a first error correcting communication mode and a second error correcting communication mode, and said control means selects either said first error correcting communication mode or said second error correcting communication mode in accordance with the result of the judgement.
Claim 16
Dependent Claim
37 words
An error data detecting communication method using half-duplex operation according to Claim 15, wherein said control means selects said first error correcting communication mode when the unused capacity of said memory is more than a specified capacity.
Claim 17
Dependent Claim
97 words
An error data detecting communication method according to Claim 15, wherein said first error correcting communication is mode for detecting the presence of an error in the received data while one block data is being received and is for requesting re-sending of data in accordance with the error detection result; and said second error correcting communication mode is for detecting an overflow in said memory and the presence of an error in the received data while one block data is being receive, and for requesting re-sending of data in accordance with the overflow and error detection results.
Claim 18
Dependent Claim
83 words
A data communication apparatus for performing error data correcting communication for a predetermined amount of data block by block, comprising: a memory for storing data to be used during error correcting communication; and control means for judging whether or not an unused capacity of said memory is not less than the amount of said one block data before data communication using the error correcting communication, and controls the communication sequence of the error correcting communication in accordance with the result of the judgement.
Claim 19
Dependent Claim
61 words
A data communication apparatus according to Claim 18, wherein said apparatus has at least a first error correcting communication mode and a second error correcting communication mode, and said control means selects either said first error correcting communication mode or said second error correcting communication mode in accordance with the result of the judgement of the unused capacity of said memory.
Claim 20
Dependent Claim
95 words
A data communication apparatus according to Claim 19, wherein said first error correcting communication mode is for detecting the presence of an error in the received data while one block data is being received and for requesting re-sending of the data in accordance with the error detection result; and said second error correcting communication mode is for detecting an overflow in said memory and the presence of an error in the received data while one block data is being received, and for requesting re-sending of data in accordance with the overflow and error detection results.
Claim 21
Dependent Claim
52 words
A data communication apparatus according to Claim 20, wherein, when in said second error correcting communication mode, an overflow in said memory is detected while one block data is being received, said control means requests re-sending of all data after the overflow detected in one block after one block data is received.
Claim 22
Dependent Claim
44 words
A data communication apparatus according to Claim 21, wherein, when there is an error data in the received data until said overflow is detected, said control means requests re-sending of both said error data and all data after the overflow detected in one block.
Claim 23
Dependent Claim
52 words
The data communication apparatus according to Claim 12, wherein, when in said second error correcting communication mode, an overflow in said memory is detected while one block data is being received, said control means requests re-sending of all data after the overflow detected in one block after one block data is received.
Claim 24
Dependent Claim
44 words
The data communication apparatus according to Claim 23, whrein, when there is an error data in the received data until said overflow is detected, said control means requests re-sending of both said error data and all data after the overflow detected. in one block.
Claim 25
Dependent Claim
29 words
A data receiving apparatus comprising a memory for storing received data, characterized in that the apparatus is responsive to the fullness of the memory to change a receiving mode.
Claim 26
Dependent Claim
16 words
Apparatus according to claim 25 arranged to signal the change of mode to the transmitting apparatus.
Claim 27
Dependent Claim
45 words
Data receiving apparatus including a data memory, and means for error correcting decoding of received data, characterized in that the decoding means is arranged to detect an empty area of the memory, and to utilize such a detected area for error correcting decoding when available.
Claim 28
Dependent Claim
11 words
Facsimile apparatus according to any one of claims 25 to 27.
References Cited (Backward Citations)
No citation records indexed.
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