EP0193410A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data communication apparatus
Assignee: Canon Inc
•
Filing: 1986-02-28
•
Granted: —
•
Expires: 2006-02-28
Abstract
Abstract There is a data communication apparatus having a transmitting section to divide data into a plurality of units and transmit the data and a memory section to store the data. This apparatus reads out the data of the designated unit from the memory section in response to a retransmission request signal from the reception side and a signal indicative of the designated unit and then retransmits the readout data from the transmitting section. Thus, even if the transmission error occurs the data can be retransmitted from the corresponding line and the retransmission is efficiently executed.
Inventors
- 👤 Takehiro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:48
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04L1/188; H04L1/1874; H04N; H04N1/00; H04N1/32; H04N1/32609; H04N1/32614; H04N1/32619
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
71 words
A data transmission apparatus comprising: transmitting means for dividing data into a plurality of units and transmitting said data; memory means for storing said data transmitted; and retransmission control means for reading out the data of the unit designated from said memory means and retransmitting said readout data by said transmitting means in response to a retransmission request signal from a reception apparatus and a signal indicative of the unit designated.
Claim 2
Dependent Claim
71 words
A data transmission apparatus comprising: transmitting means for dividing data into a plurality of units and transmitting said data; memory means for storing said data transmitted; and retransmission control means for reading out the data of the unit designated from said memory means and retransmitting said readout data by said transmitting means in response to a retransmission request signal from a reception apparatus and a signal indicative of the unit designated.
Claim 3
Dependent Claim
15 words
A data transmission apparatus according to claim 1, wherein said data is encode image data.
Claim 4
Dependent Claim
18 words
A data transmission apparatus according to claim 2, wherein said unit is one line of said image data.
Claim 5
Dependent Claim
77 words
A data reception apparatus comprising: receiving means for dividing data into a plurality of units and receiving said data; memory means for storing an identifying signal of said unit; detecting means for detecting a transmission error; and transmitting means for sending an identifying signal to be retransmitted to a transmission side in response to a detection output of said detecting means on the basis of a retransmission request signal and said identifying signal in said memory means.
Claim 6
Dependent Claim
77 words
A data reception apparatus comprising: receiving means for dividing data into a plurality of units and receiving said data; memory means for storing an identifying signal of said unit; detecting means for detecting a transmission error; and transmitting means for sending an identifying signal to be retransmitted to a transmission side in response to a detection output of said detecting means on the basis of a retransmission request signal and said identifying signal in said memory means.
Claim 7
Dependent Claim
15 words
A data reception apparatus according to claim 4, wherein said data is encode image data.
Claim 8
Dependent Claim
18 words
A data reception apparatus according to claim 5, wherein said unit is one line of said image data.
Claim 9
Dependent Claim
61 words
A data reception apparatus comprising: receiving means for dividing data into a plurality of units and receiving said data; discriminating means for discriminating a reception error; transmitting means for sending a retransmission request signal to a transmission side in response to a discrimination output of said discriminating means; and setting means for variably setting a discrimination reference of said discriminating means.
Claim 10
Dependent Claim
61 words
A data reception apparatus comprising: receiving means for dividing data into a plurality of units and receiving said data; discriminating means for discriminating a reception error; transmitting means for sending a retransmission request signal to a transmission side in response to a discrimination output of said discriminating means; and setting means for variably setting a discrimination reference of said discriminating means.
Claim 11
Dependent Claim
15 words
A data reception apparatus according to claim 7, wherein said data is encode image data.
Claim 12
Dependent Claim
18 words
A data reception apparatus according to claim 8, wherein said unit is one line of said image data.
Claim 13
Dependent Claim
73 words
An image data reception apparatus comprising: receiving means for receiving a training signal prior to reception of encode image data and transmission of said image data; detecting means for detecting that said training signal was not correctly received by said receiving means; and transmitting means for transmitting a retransmission request signal to request for retransmission of said image data to a transmission side in response to a detection output of said detecting means.
Claim 14
Dependent Claim
73 words
An image data reception apparatus comprising: receiving means for receiving a training signal prior to reception of encode image data and transmission of said image data; detecting means for detecting that said training signal was not correctly received by said receiving means; and transmitting means for transmitting a retransmission request signal to request for retransmission of said image data to a transmission side in response to a detection output of said detecting means.
Claim 15
Dependent Claim
81 words
An image data reception apparatus comprising: receiving means for receiving image data for every line and an end of line code indicative of the end of each line of said image data; detecting means for detecting that said end of line code was not correctly received by said receiving means; and transmitting means for sending a retransmission request signal to request for retransmission of said image data to a transmission side in response to a detection output of said detecting means.
Claim 16
Dependent Claim
81 words
An image data reception apparatus comprising: receiving means for receiving image data for every line and an end of line code indicative of the end of each line of said image data; detecting means for detecting that said end of line code was not correctly received by said receiving means; and transmitting means for sending a retransmission request signal to request for retransmission of said image data to a transmission side in response to a detection output of said detecting means.
Claim 17
Dependent Claim
63 words
A data reception apparatus comprising: receiving means for receiving data divided into a plurality of units; detecting means for detecting a reception error for each of said units; and transmitting means for sending a data retransmission request signal to a transmission side in the case where the number of reception error units which are detected by said detecting means exceeds a predetermined value.
Claim 18
Dependent Claim
63 words
A data reception apparatus comprising: receiving means for receiving data divided into a plurality of units; detecting means for detecting a reception error for each of said units; and transmitting means for sending a data retransmission request signal to a transmission side in the case where the number of reception error units which are detected by said detecting means exceeds a predetermined value.
Claim 19
Dependent Claim
15 words
A data reception apparatus according to claim 12, wherein said data is encode image data.
Claim 20
Dependent Claim
18 words
A data reception apparatus according to claim 13, wherein said unit is one line of said image data.
Claim 21
Dependent Claim
85 words
A data reception apparatus comprising: receiving means for receiving data divided into a plurality of units; detecting means for detecting a reception error for each of said units; transmitting means for sending a data transmission request signal to a transmission side in response to a detection output of said detecting means; and second transmitting means for sending an instruction signal to instruct a gradual decrease of a transmission speed when the number of sending times of said data retransmission request signal becomes a predetermined value.
Claim 22
Dependent Claim
85 words
A data reception apparatus comprising: receiving means for receiving data divided into a plurality of units; detecting means for detecting a reception error for each of said units; transmitting means for sending a data transmission request signal to a transmission side in response to a detection output of said detecting means; and second transmitting means for sending an instruction signal to instruct a gradual decrease of a transmission speed when the number of sending times of said data retransmission request signal becomes a predetermined value.
Claim 23
Dependent Claim
35 words
A data reception apparatus according to claim 15, wherein after said instruction signal was sent, when said data is correctly received by only a predetermined amount, the transmission speed is reset to an original speed.
Claim 24
Dependent Claim
15 words
A data reception apparatus according to claim 15, wherein said data is encode image data.
Claim 25
Dependent Claim
18 words
A data reception apparatus according to claim 17, wherein said unit is one line of said image data.
Claim 26
Dependent Claim
44 words
A data communication apparatus comprising: communicating means for transmitting or receiving data; retransmitting means for retransmitting the data in the case where an error occurs in said transmission or reception; and selecting means for selecting whether said retransmitting means is made operative or inoperative.
Claim 27
Dependent Claim
44 words
A data communication apparatus comprising: communicating means for transmitting or receiving data; retransmitting means for retransmitting the data in the case where an error occurs in said transmission or reception; and selecting means for selecting whether said retransmitting means is made operative or inoperative.
Claim 28
Dependent Claim
21 words
A data communication apparatus according to claim 19, wherein a transmission speed is simultaneously selected upon selection by said selecting means.
Claim 29
Dependent Claim
14 words
A data communication apparatus according to claim 19, wherein said data.is encode image data.
Claim 30
Dependent Claim
88 words
A data communication system comprising: a data transmission apparatus having transmitting means for sending data and a training signal prior to transmission of said data; a data reception apparatus having receiving means for receiving said data and said training signal; detecting means for detecting that said training signal was not correctly received by said receiving means; and discriminating means for discriminating due to which cause on the transmission side or on the reception side the reception error of said training signal occurred in response to said detection output.
Claim 31
Dependent Claim
88 words
A data communication system comprising: a data transmission apparatus having transmitting means for sending data and a training signal prior to transmission of said data; a data reception apparatus having receiving means for receiving said data and said training signal; detecting means for detecting that said training signal was not correctly received by said receiving means; and discriminating means for discriminating due to which cause on the transmission side or on the reception side the reception error of said training signal occurred in response to said detection output.
Claim 32
Dependent Claim
15 words
A data communication system according to claim 22, wherein said data is encode image data.
Claim 33
Dependent Claim
83 words
A data transmission apparatus comprising: transmitting means for transmitting a communication procedure signal and a data signal; retransmitting means for resending the data signal when said retransmission request signal is sent from a reception side; confirming means for checking the presence or absence of said retransmission request signal after completion of the transmission of said data signal; and control means for allowing said communication procedure signal to be sent after the absence of the retransmission request signal was confirmed by said confirming means.
Claim 34
Dependent Claim
83 words
A data transmission apparatus comprising: transmitting means for transmitting a communication procedure signal and a data signal; retransmitting means for resending the data signal when said retransmission request signal is sent from a reception side; confirming means for checking the presence or absence of said retransmission request signal after completion of the transmission of said data signal; and control means for allowing said communication procedure signal to be sent after the absence of the retransmission request signal was confirmed by said confirming means.
Claim 35
Dependent Claim
15 words
A data transmission apparatus according to claim 24, wherein said data is encode image data.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.