EP0137695A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of signal transmission with selected signal transmission rate
Assignee: Fujitsu Ltd
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Filing: 1984-08-29
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Granted: —
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Expires: 2004-08-29
Abstract
Abstract A method for transmitting a signal with a signal transmission rate selected from a plurality of signal transmission rates applicable to a facsimile transmission system. The distortion amount of a distortion measurement signal transmitted from a transmitting equipment is measured at a receiving equipment on the basis of the variation in the received distortion measurement signal. The distortion allowance range to which the measured distortion amount belongs is decided on the basis of the result of the measurement of the distortion amount. The transmission of the working signals is carried out with a transmission rate corresponding to the result of the decision of the distortion allowance range.
Inventors
- 👤 Takashi Kaku
- 👤 Ryoji Okita
- 👤 Masayoshi Inoue
- 👤 Shozo Kudo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 08:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/333; H04N1/33307; H04N1/33323; H04L; H04L1/00; H04L1/20; H04L1/206; H04L5/00; H04L5/14; H04L5/1438; H04L5/1446; H04N1/33346; H04N1/33392; H04N2201/00; H04N2201/32; H04N2201/333; H04N2201/33307; H04N2201/33342; H04N2201/3335; H04N2201/33371
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
150 words
A method for transmitting a signal with a signal transmission rate selected from a plurality of signal transmission rates comprising the steps of: predetermining a plurality of distortion allowance ranges in correspondence with the ranges of signal transmission rate; transmitting a distortion measurement signal from a transmitting equipment to a receiving equipment; measuring the distortion amount of said distortion measurement signal, at the receiving equipment, on the basis of the variation in said transmitted distortion measurement signal received by the receiving equipment; deciding a distortion allowance range to which said measured distortion amount belongs on the basis of the result of said measurement of the distortion amount, either at the receiving equipment, or at the transmitting equipment on the basis of the measured distortion amount transmitted from the receiving equipment; and starting the signal transmission with a transmission rate corresponding to the result of said decision of distortion allowance range.
Claim 2
Independent Claim
150 words
A method for transmitting a signal with a signal transmission rate selected from a plurality of signal transmission rates comprising the steps of: predetermining a plurality of distortion allowance ranges in correspondence with the ranges of signal transmission rate; transmitting a distortion measurement signal from a transmitting equipment to a receiving equipment; measuring the distortion amount of said distortion measurement signal, at the receiving equipment, on the basis of the variation in said transmitted distortion measurement signal received by the receiving equipment; deciding a distortion allowance range to which said measured distortion amount belongs on the basis of the result of said measurement of the distortion amount, either at the receiving equipment, or at the transmitting equipment on the basis of the measured distortion amount transmitted from the receiving equipment; and starting the signal transmission with a transmission rate corresponding to the result of said decision of distortion allowance range.
Claim 3
Dependent Claim
31 words
A method according to claim 1, 'wherein the signal to be transmitted with said transmission rate corresponding to the result of said decision of distortion allowance range is a picture signal.
Claim 4
Dependent Claim
28 words
A method according to claim 2, wherein the transmission rate of said distortion measurement signal is one of a plurality of transmission rates for transmitting a picture signal.
Claim 5
Dependent Claim
30 words
A method according to claim 3, wherein said distortion measurement-signal is a signal obtained by modulating a carrier signal in correspondence with the transmission rate of said distortion measurement signal.
Claim 6
Dependent Claim
36 words
A method according to claim 1, wherein said distortion amount of said distortion measurement signal corresponds to the integrated value obtained by integrating the variations in said transmitted distortion measurement signal at a sequence of timings.
Claim 7
Dependent Claim
32 words
A method according to claim 5, wherein said decision of said distortion allowance range is carried out by a decision means for converting said distortion amount to information indicating a transmission rate.
Claim 8
Dependent Claim
38 words
A method according to claim 6, wherein said decision means is a storing device for storing a transmission rate corresponding to a distortion allowance range to which said distortion amount belongs in storing regions corresponding to distortion amounts.
Claim 9
Dependent Claim
97 words
Transmitting equipment for use in the method of any one of the preceding claims and comprising means (21) for effecting a signal transmission at any one of a plurality of selectable transmission rates, characterised by: means (211) for transmitting, prior to said signal transmission, a distortion measurement signal of such form that receiving equipment can measure from it the amount of distortion of the distortion measurement signal as received; and means (22) for receiving from such receiving equipment a signal dependent upon the distortion amount for selecting said transmission rate without reiteration of the distortion measurement signal.
Claim 10
Dependent Claim
81 words
Receiving equipment for use in the method of any one of claims 1 to 7, characterised by means (42) for receiving a distortion measurement signal and for measuring the amount of distortion of that signal on the basis of the variation in the distortion of that signal as received; and means (34, 43) for transmitting to the source of that signal a signal defining said amount whereby the source can be set thereby to a corresponding transmission rate for subsequent transmission.
Claim 11
Independent Claim
176 words
A system comprising transmitting equipment and receiving equipment for use in transmitting a signal between the two with a signal transmission rate selected from a plurality of signal transmission rates, the system predetermining a plurality of distortion allowance ranges in correspondence with the ranges of signal transmission rates, the transmitting equipment having means for transmitting a distortion measurement signal to the receiving equipment; the receiving equipment having means for measuring the distortion amount of said distortion measurement signal on the basis of the variation in said transmitted distortion measurement signal received by the receiving equipment; and the system also comprising means for deciding a distortion allowance range to which said measured distortion amount belongs on the basis of the result of said measurement of the distortion amount, either at the receiving equipment, or at the transmitting equipment on the basis of the measured distortion amount transmitted from the receiving equipment; and means for starting the signal transmission at the transmitting equipment with a transmission rate corresponding to the result of said decision of distortion allowance range.
Claim 12
Independent Claim
176 words
A system comprising transmitting equipment and receiving equipment for use in transmitting a signal between the two with a signal transmission rate selected from a plurality of signal transmission rates, the system predetermining a plurality of distortion allowance ranges in correspondence with the ranges of signal transmission rates, the transmitting equipment having means for transmitting a distortion measurement signal to the receiving equipment; the receiving equipment having means for measuring the distortion amount of said distortion measurement signal on the basis of the variation in said transmitted distortion measurement signal received by the receiving equipment; and the system also comprising means for deciding a distortion allowance range to which said measured distortion amount belongs on the basis of the result of said measurement of the distortion amount, either at the receiving equipment, or at the transmitting equipment on the basis of the measured distortion amount transmitted from the receiving equipment; and means for starting the signal transmission at the transmitting equipment with a transmission rate corresponding to the result of said decision of distortion allowance range.
References Cited (Backward Citations)
No citation records indexed.
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