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US 5,127,013 AGranted
Data communication system
AssigneeCanon Kabushiki Kaisha
InventorTakehiro Yoshida
Life of this patent
Estimating the term…
Abstract
A data communication system, capable of operating in an error correction mode, is capable of producing, when data received in an error correction mode could not be correctly recorded, information indicative of the occurrence of such a recording failure. When an error exists in data received in the error correction mode, a message is recorded subsequent to the recording of the received data to announce the presence of the error, thus facilitating recognition of the occurrence of error.
Claims15
A data communication system comprising:
- data receiving means for receiving data;
- data memory means for storing data received by said data receiving means;
- recording means for recording the data stored in said data memory means;
- acknowledgement signal generating means for transmitting an acknowledgement signal representative of safe receipt of one page of data when data of one page has been correctly received;
- information memory means for storing information representative of a recording condition of the data stored in said data memory means;
- and
- information output means for producing information indicative of the fact that there are non-recorded data in accordance with the information of said information memory means, wherein, in the case of power failure in recording data by said recording means, said information output means outputs information indicative of the existence of non-recorded data in accordance with the information of said information memory means.
4 more elements
A data communication system comprising:
- data receiving means for receiving data;
- data memory means for storing data received by said data receiving means;
- recording means for recording data stored in said data memory means;
- acknowledgement signal generating means for transmitting an acknowledgement signal representative of safe receipt of one page of data when data of one page has been correctly received;
- information memory means for storing information representative of a recording condition of the data stored in said data memory means;
- and
- information output means for producing information indicative of the fact that there are non-recorded data in accordance with the information of said information memory means, wherein, in the case of power failure in recording data by said recording means, said information output means outputs information indicative of the existence of non-recorded data in accordance with a power-on after the power failure.
4 more elements
A data communication system comprising:
- first means for receiving signals of a high transmission speed;
- and
- second receiving means for receiving signals of a low transmission speed;
- control means for switching said first and second receiving means to enable a selected one of said receiving means to receive signals;
- wherein said control means determines whether a predetermined one of said high-speed signals has been detected continuously throughout a predetermined period and for effecting switching to said first receiving means when said predetermined high-speed signal has been detected continuously throughout said predetermined period, and, when said predetermined high-speed signal has not been detected continuously throughout said period, said control means enables said second receiving means to receive said low-speed signals for a time corresponding to a time required for the transmission of a predetermined unit of said high-speed signals.
2 more elements
A data communication system comprising:
- first means for receiving signals of a high transmission speed;
- second receiving means for receiving signals of a low transmission speed;
- and
- control means for switching said first and second receiving means to enable a selected one of said receiving means to receive signals,
- wherein said control means determines whether a predetermined one of said high-speed signals has been detected continuously throughout a predetermined period and for effecting switching to said first receiving means when said predetermined high-speed signal has been detected continuously throughout said predetermined period, and, when said predetermined high-speed signal has not been detected continuously throughout said period, said control means enables said second receiving means to receive said low-speed signals for a time corresponding to a time required for the transmission of a predetermined unit of said high-speed signals,
- wherein said high-speed signals include image signals, and said low-speed signals include a control signal, and
- wherein said control means executes an error routine so as to open a communication circuit both when no frame of image signals is detected in a period which is the sum of an image transmission time corresponding to the current transmission speed and a margin time, and when no effective frame of image signals is detected in a predetermined time from the detection of a previous effective frame of image signals.
4 more elements
A data communication system comprising:
- receiving means for receiving data;
- detection means for detecting whether an uncorrectable error frame of data exists in the received data;
- recording means for recording the received data;
- and
- control means responsive to the detection for enabling said recording means to record, when the presence of error has been detected by said detecting means, a message indicative of the presence of the error together with the recorded received data,
- wherein the recording of the message indicative of the presence of the error is conducted on the basis of a physical page of a sending side,
- wherein said data received is image data, and
- wherein the received image data is image data of a long continuous original page of the sending side, and said recording means records the received image data on a plurality of cut sheets of a predetermined size, said message indicative of the presence of error being recorded on each of a plurality of cut sheets corresponding to one long continuous original of the sending side.
5 more elements
Dependencies are inferred from the claim text.