US5031179A
Expired / Lapsed
US
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Data communication apparatus
Assignee: Canon Inc
•
Filing: 1988-11-04
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Granted: 1991-07-09
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Expires: 2008-11-04
Abstract
Abstract A data communication apparatus having an error retransmission mode allows the operator to ascertain an amount of error data when an error is contained in data and when the error is not corrected despite retransmission of the error a predetermined number of times, or makes it possible to reproduce data with respect to correctly received data by discriminating correct data contained in error data, thereby preventing error data from becoming wasted as practically as possible. In addition, at the time of error retransmission, a transmission mode for retransmitting the error data is changed so as to minimize the number of incidents of error retransmission, thereby to enable efficient data transmission.
Inventors
- 👤 Takehiro Yoshida
- 👤 Susumu Matsuzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:12
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0706; G06F11/0733; G06F11/0766; G06F11/0784; G06F11/14; G06F11/1402; G06F11/1415; G06F11/1443; H04L1/12; H04L1/16; H04L1/18; H04L1/1803; H04N; H04N1/00; H04N1/32; H04N1/32609; H04N1/32614; H04N1/32619; H04N1/333; H04N1/3333; H04N1/33346; H04N2201/00; H04N2201/32; H04N2201/333; H04N2201/33307; H04N2201/33342; H04N2201/3335
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
57 words
A data communication apparatus comprising: receiving means for receiving data; recording means for recording data received by said receiving means; and control means for detecting error data in data received by said receiving means and, responsive to detection of the presence of error data, for controlling recording of information indicating that the received data contains error data.
Claim 2
Dependent Claim
57 words
A data communication apparatus comprising: receiving means for receiving data; recording means for recording data received by said receiving means; and control means for detecting error data in data received by said receiving means and, responsive to detection of the presence of error data, for controlling recording of information indicating that the received data contains error data.
Claim 3
Dependent Claim
60 words
A data communication apparatus comprising: data communication means for effecting data communication; detecting means for determining the presence of any error in data and detecting an amount of error data; and display means for displaying information which indicates an amount of error data detected by said detecting means, wherein said display means displays a specific pattern corresponding to said information.
Claim 4
Dependent Claim
60 words
A data communication apparatus comprising: data communication means for effecting data communication; detecting means for determining the presence of any error in data and detecting an amount of error data; and display means for displaying information which indicates an amount of error data detected by said detecting means, wherein said display means displays a specific pattern corresponding to said information.
Claim 5
Dependent Claim
21 words
A data communication apparatus according to claim 2, wherein said display means displays said specific pattern by reproducing said specific pattern.
Claim 6
Dependent Claim
30 words
A data communication apparatus according to claim 2, wherein said display means reproduces data received by said data communication means and reproduces both said data received and said specific pattern.
Claim 7
Dependent Claim
26 words
A data communication apparatus according to claim 1, further comprising transmitting means connected to said control means for transmitting a signal requesting retransmission of error data.
Claim 8
Dependent Claim
39 words
A data communication apparatus according to claim 5, wherein if error data remains in said received data after retransmission of data a predetermined number of times, said control means records information indicating that the received data contains error data.
Claim 9
Dependent Claim
17 words
A data communication apparatus according to claim 1, wherein said information represents an amount of error data.
Claim 10
Dependent Claim
15 words
A data communication apparatus according to claim 1, wherein said information is a specific pattern.
Claim 11
Dependent Claim
67 words
A data communication apparatus comprising: transmitting means for transmitting data; receiving means for receiving a signal representing a request for retransmission of data; and control means connected to said transmitting and receiving means for determining an amount of error data among data transmitted by said transmitting means on the basis of said retransmission request signal and for causing transmission of information indicating said amount of error data.
Claim 12
Dependent Claim
67 words
A data communication apparatus comprising: transmitting means for transmitting data; receiving means for receiving a signal representing a request for retransmission of data; and control means connected to said transmitting and receiving means for determining an amount of error data among data transmitted by said transmitting means on the basis of said retransmission request signal and for causing transmission of information indicating said amount of error data.
Claim 13
Dependent Claim
40 words
A data communication apparatus according to claim 9, wherein said transmitting means transmits data by dividing said data into a plurality of blocks and retransmits data of a block indicated by said retransmission request signal received by said receiving means.
Claim 14
Dependent Claim
41 words
A data communication apparatus according to claim 10, wherein, if said retransmission request signal is received by said receiving means when retransmission is effected by said transmitting means a predetermined number of times, said control means causes transmission of said information.
Claim 15
Dependent Claim
79 words
A data communication apparatus comprising: receiving means for receiving data; means for determining an error in received data and for transmitting a signal representing a request for retransmitting a signal representing a request for retransmission of data which is determined to be in error to a data transmission side; and reproducing means connected to said receiving means for reproducing normal data contained in error data received by said receiving means when there is error data in said received data.
Claim 16
Dependent Claim
79 words
A data communication apparatus comprising: receiving means for receiving data; means for determining an error in received data and for transmitting a signal representing a request for retransmitting a signal representing a request for retransmission of data which is determined to be in error to a data transmission side; and reproducing means connected to said receiving means for reproducing normal data contained in error data received by said receiving means when there is error data in said received data.
Claim 17
Dependent Claim
21 words
A data communication apparatus according to claim 12, wherein said reproducing means reproduces normal line data contained in said error data.
Claim 18
Dependent Claim
42 words
A data communication apparatus according to claim 12, wherein said reproducing means reproduces normal data contained in said error data when there is an error in said received data when retransmission of error data has been effected a predetermined number of times.
Claim 19
Dependent Claim
59 words
A data communication apparatus connectable to a modem for transmitting data through the modem which transmits data after transmitting a signal for adjusting the modem, comprising: receiving means for receiving a retransmission request signal; and control means for changing a time duration of transmission of said signal for adjusting the modem according to said retransmission request signal during retransmission.
Claim 20
Dependent Claim
59 words
A data communication apparatus connectable to a modem for transmitting data through the modem which transmits data after transmitting a signal for adjusting the modem, comprising: receiving means for receiving a retransmission request signal; and control means for changing a time duration of transmission of said signal for adjusting the modem according to said retransmission request signal during retransmission.
Claim 21
Dependent Claim
45 words
A data communication apparatus according to claim 15, wherein said control means changes the time duration of transmission of said signal for adjusting the modem during retransmission when said control means receives said retransmission request signal after retransmission of said signal for adjusting the modem.
Claim 22
Dependent Claim
25 words
A data communication apparatus according to claim 16, wherein said control means extends the time duration of transmission of said signal for adjusting the modem.
Claim 23
Dependent Claim
20 words
A data communication apparatus according to claim 15, wherein said signal for adjusting the modem is a flag pattern signal.
Claim 24
Dependent Claim
79 words
A data communication apparatus comprising: transmission means for transmitting block data consisting of a plurality of frames; receiving means for receiving a retransmission request signal containing information indicating a frame to be transmitted in the transmitted block data; and control means for retransmitting frame data by said transmitting means according to said retransmission request signal, for analyzing information of said retransmission request signal and for changing a mode for transmission of data in accordance with the results of analysis.
Claim 25
Dependent Claim
79 words
A data communication apparatus comprising: transmission means for transmitting block data consisting of a plurality of frames; receiving means for receiving a retransmission request signal containing information indicating a frame to be transmitted in the transmitted block data; and control means for retransmitting frame data by said transmitting means according to said retransmission request signal, for analyzing information of said retransmission request signal and for changing a mode for transmission of data in accordance with the results of analysis.
Claim 26
Dependent Claim
63 words
A data communication apparatus according to claim 19, wherein said retransmission request signal contains bit map information indicating frames to be transmitted in said block data, said control means analyzes a selected one of a bit pattern indicating frames to be retransmitted and the total of bit indicating frames to be transmitted and, in accordance with the results, changes the mode of transmission.
Claim 27
Dependent Claim
50 words
A data communication apparatus according to claim 19, wherein said transmission means includes a modem having a plurality of modulation modes for transmission of data; said control means changing the mode when said selected bit pattern is a predetermined pattern or said selected total of bits exceeds a predetermined number.
Claim 28
Dependent Claim
89 words
A data communication apparatus comprising: data transmitting means for transmitting data by dividing the same into a plurality of blocks and effecting retransmission of block data in response to a retransmission request from a reception side; control means for shifting from transmission of a current block to transmission of an ensuing block when an error in said current block is not corrected even after retransmission is effected a predetermined number of times; and instructing means for prohibiting a shift by said control means to transmission of said ensuing block.
Claim 29
Dependent Claim
89 words
A data communication apparatus comprising: data transmitting means for transmitting data by dividing the same into a plurality of blocks and effecting retransmission of block data in response to a retransmission request from a reception side; control means for shifting from transmission of a current block to transmission of an ensuing block when an error in said current block is not corrected even after retransmission is effected a predetermined number of times; and instructing means for prohibiting a shift by said control means to transmission of said ensuing block.
Claim 30
Dependent Claim
115 words
A data communication apparatus comprising: receiving means for receiving data in units of a page; detecting means for detecting an error in received data; reproducing means for reproducing said received data in units of a page; inhibiting means for inhibiting reproduction of page data when error data is contained in the data of a received page; and means for making a request for retransmission of error data in accordance with detection by said detecting means, wherein, when an error is detected by said detecting means despite retransmission of error data by a predetermined number of times in response to said retransmission request, said inhibiting means inhibits reproduction of page data contained in said error data.
Claim 31
Dependent Claim
115 words
A data communication apparatus comprising: receiving means for receiving data in units of a page; detecting means for detecting an error in received data; reproducing means for reproducing said received data in units of a page; inhibiting means for inhibiting reproduction of page data when error data is contained in the data of a received page; and means for making a request for retransmission of error data in accordance with detection by said detecting means, wherein, when an error is detected by said detecting means despite retransmission of error data by a predetermined number of times in response to said retransmission request, said inhibiting means inhibits reproduction of page data contained in said error data.
Claim 32
Dependent Claim
25 words
A data communication apparatus according to claim 23, further comprising outputting means for putputting information indicating that an error is contained in said page data.
Claim 33
Dependent Claim
134 words
A data communication apparatus which transmits data at a first transmission speed and transmits a signal for procedure of transmission at a second speed lower than said first transmission speed, comprising: first transmitting means for transmitting data at said first transmission speed; receiving means for receiving a retransmission request signal of data transmitted by said first transmitting means; retransmitting means for retransmitting data by said first transmitting means according to said retransmission request signal; counting means for counting a frequency of retransmission by said retransmitting means; second transmitting means for transmitting a signal indicating whether to repeat retransmission or to transmit next data when a retransmission request signal is received after retransmission a predetermined number of times; and transmitting means for transmitting a timing information for transmitting signal by said second transmitting means beforehand.
Claim 34
Dependent Claim
134 words
A data communication apparatus which transmits data at a first transmission speed and transmits a signal for procedure of transmission at a second speed lower than said first transmission speed, comprising: first transmitting means for transmitting data at said first transmission speed; receiving means for receiving a retransmission request signal of data transmitted by said first transmitting means; retransmitting means for retransmitting data by said first transmitting means according to said retransmission request signal; counting means for counting a frequency of retransmission by said retransmitting means; second transmitting means for transmitting a signal indicating whether to repeat retransmission or to transmit next data when a retransmission request signal is received after retransmission a predetermined number of times; and transmitting means for transmitting a timing information for transmitting signal by said second transmitting means beforehand.
Claim 35
Dependent Claim
20 words
A data communication apparatus according to claim 25, wherein said timing information indicates the upper limit of frequency of retransmission.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |