Patent US3906154A successfully refreshed from Google Patents.
US3906154A
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Signal transmission system
Assignee: US Philips Corp
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Filing: 1973-11-20
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Granted: 1975-09-16
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Expires: 1993-11-20
Abstract
Abstract A facsimile signal transmission system including a transmitter in which a store provides a high frequency signal during signal repetition periods which signal is, for example, frequencymodulated. This signal is applied to a counting circuit in which a continuous count is effected with binary numbers associated with a plurality of outputs. A counting signal is applied each signal repetition period to a second counting circuit so that one binary number occurs at a plurality of outputs during each period. The first and second counting circuits are connected to a coincidence stage for supplying a signal in case of equal binary numbers to a transmission channel having a limited bandwidth to a receiver. The receiver includes a store for cyclically meshing storage of the received signal so that after a number of signal repetition periods equal to the maximum counting number of the counting circuits the high frequency signal is present in the receiver.
Inventors
- 👤 Niet Edmond De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/4135; H04N7/00; H04N7/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
294 words
A signal transmission system comprising a transmitter conveying a high frequency signal, a transmission channel having a limited bandwidth and a receiver, said transmitter comprising a store having an output which conveys in a cyclical manner in signal repetition periods the high frequency signal to be transmitted, and a circuit through which the store is connectable to the transmission channel during cyclically occurring relatively short time durations, the receiver comprising a store connectable to the transmission channel for cyclically meshing storage of the transmitted signals, the transmitter comprising a first counting circuit means coupled to said transmitter store output for counting signal transitions relative to a reference value present in the signal applied thereto, said counting circuit having a first plurality of outputs which dependent on the counted number of signal transitions convey a binary number, said transmitter furthermore including a second counting circuit having an input for the supply of a counting signal having a repetition period whose duration is equal to the signal repetition period of the high frequency signal and having a second plurality of outputs which dependent on the counted number of signal transitions in the counting signal relative to a reference value convey a binary number, a coincidence stage having respective inputs coupled to said pluralities of outputs of the first and second counting circuits and an output connectable to the transmission channel for the supply of a signal upon the same binary number being present at the two pluralities of inputs of the coincidence stage, the store in the receiver being connectable to the transmission channel during a number of signal repetition periods which is equal to the said number of signal transition counts in the said first and second counting circuits for the cyclically meshing signal storage.
Claim 2
Dependent Claim
294 words
A signal transmission system comprising a transmitter conveying a high frequency signal, a transmission channel having a limited bandwidth and a receiver, said transmitter comprising a store having an output which conveys in a cyclical manner in signal repetition periods the high frequency signal to be transmitted, and a circuit through which the store is connectable to the transmission channel during cyclically occurring relatively short time durations, the receiver comprising a store connectable to the transmission channel for cyclically meshing storage of the transmitted signals, the transmitter comprising a first counting circuit means coupled to said transmitter store output for counting signal transitions relative to a reference value present in the signal applied thereto, said counting circuit having a first plurality of outputs which dependent on the counted number of signal transitions convey a binary number, said transmitter furthermore including a second counting circuit having an input for the supply of a counting signal having a repetition period whose duration is equal to the signal repetition period of the high frequency signal and having a second plurality of outputs which dependent on the counted number of signal transitions in the counting signal relative to a reference value convey a binary number, a coincidence stage having respective inputs coupled to said pluralities of outputs of the first and second counting circuits and an output connectable to the transmission channel for the supply of a signal upon the same binary number being present at the two pluralities of inputs of the coincidence stage, the store in the receiver being connectable to the transmission channel during a number of signal repetition periods which is equal to the said number of signal transition counts in the said first and second counting circuits for the cyclically meshing signal storage.
Claim 3
Dependent Claim
24 words
A signal transmission system as claimed in claim 1, wherein the output of the store conveying the high frequency signal conveys a frequency-modulated signal.
Claim 4
Dependent Claim
30 words
A signal transmission system as claimed in claim 2, wherein the output of the store is connected through a full-wave rectifier circuit to the input of the first counting circuit.
Claim 5
Dependent Claim
106 words
A signal transmission system as claimed in claim 1, wherein for the purpose of synchronization of the store in the transmitter and that in the receiver the transmitter is provided with a signal generator connectable to the transmission channel for supplying a synchronizing signal having a frequency removed by a selective frequency cutoff filter between the output of the coincidence stage and the transmission channel from the signal to be supplied by the stage and that in the receiver a selective frequency pass filter is connectable to the transmission channel for separating the synchronising signal for the purpose of synchronisation of the store in the receiver.
Claim 6
Dependent Claim
60 words
A signal transmission system as claimed in claim 4, wherein the said signal generator in the transmitter provides the synchronizing signal with a phase change as a function of the said signal repetition period of the store in the transmitter and that the receiver includes a phase detector between the selective frequency pass filter and the store to be synchronized.
Claim 7
Dependent Claim
126 words
A signal transmission system as claimed in claim 4 wherein in the transmitter the output of the coincidence stage conveying a pulsatory signal is connectable to the transmission channel through a signal generator supplying a square-wave signal and a signal generator is incorporated in the receiver between the traNsmission channel and the store, which generator supplies short-lasting pulses under the control of the received signal for the purpose of storage in the store, the signal generator supplying the square-wave signal is connnectable to the transmission channel through the selective frequency cut-off filter and in the receiver the transmission channel is connectable to the signal generator providing the short-lasting pulses through a selective frequency cut-off filter having the same cut-off frequency as the filter in the transmitter.
Claim 8
Dependent Claim
73 words
A signal transmission system as claimed in claim 1, wherein in the transmitter the output of the coincidence stage conveying a pulsatory signal is connectable to the transmission channel through a signal generator supplying a square-wave signal and a signal generator is incorporated in the receiver between the transmission channel and the store, which generator supplies short-lasting pulses under the control of the received signal for the purpose of storage in the store.
Claim 9
Dependent Claim
219 words
A transmitter for conveying a high frequency signal in a transmission channel having a limited bandwidth, said transmitter comprising a store having an output which cyclically conveys in signal repetition periods the high frequency signal to be transmitted, means for coupling the store output to the transmission channel during cyclically occurring relatively short time durations, a first counting circuit means for counting signal transitions relative to a reference value present in the signal applied thereto, said counting circuit having an input coupled to said store output and a plurality of outputs which dependent on the counted number of signal transitions convey a binary number, a second counting circuit means having an input for receiving a counting signal having a repetition period whose duration is equal to the signal repetition period of the high frequency signal and having a plurality of outputs which dependent on the counted number of signal transitions in the counting signal relative to a reference value convey a binary number, and a coincidence stage means having first and second pluralities of inputs coupled to said pluralities of outputs of the first and second counting circuits and an output coupled to the transmission channel for the supply of a signal upon the same binary number being present at the two pluralities of inputs of the coincidence stage.
Claim 10
Dependent Claim
219 words
A transmitter for conveying a high frequency signal in a transmission channel having a limited bandwidth, said transmitter comprising a store having an output which cyclically conveys in signal repetition periods the high frequency signal to be transmitted, means for coupling the store output to the transmission channel during cyclically occurring relatively short time durations, a first counting circuit means for counting signal transitions relative to a reference value present in the signal applied thereto, said counting circuit having an input coupled to said store output and a plurality of outputs which dependent on the counted number of signal transitions convey a binary number, a second counting circuit means having an input for receiving a counting signal having a repetition period whose duration is equal to the signal repetition period of the high frequency signal and having a plurality of outputs which dependent on the counted number of signal transitions in the counting signal relative to a reference value convey a binary number, and a coincidence stage means having first and second pluralities of inputs coupled to said pluralities of outputs of the first and second counting circuits and an output coupled to the transmission channel for the supply of a signal upon the same binary number being present at the two pluralities of inputs of the coincidence stage.
Claim 11
Dependent Claim
55 words
A transmitter as claimed in claim 8, wherein the transmitter includes a signal generator for applying synchronising signals to the store and to flipflops incorporated in the transmitter and supplying the counting signal for the second counting circuit and a set signal for the first counting circuit for setting the circuit in a given position.
Claim 12
Dependent Claim
47 words
A transmitter as claimed in claim 9, wherein a reset input of one of the said flipflops is connected to an automatic blocking circuit whose blocking can be eliminated by an on-off switch, said blocking circuit blocking the signal supply to the first and second counting circuits.
Claim 13
Dependent Claim
74 words
A transmitter as claimed in claim 10, wherein said second counting circuit comprises a third plurality of outputs and the automatic blocking circuit is formed with a gate having a plurality of inputs which are connected to said third plurality of outputs of the second counting circuit, said gate having an output means for providing a blocking signal when the maximum counting number thereof is reached by the count in the second counting circuit.
Claim 14
Dependent Claim
45 words
A transmitter as claimed in claim 11, wherein the blocking circuit includes a hold circit coupled to said gate output so that the blocking signal occurs at the end of the signal repetition period associated with the maximum counting number of the second counting circuit.
Claim 15
Dependent Claim
70 words
A receiver for receiving a high frequency signal cyclically transmitted in signal repetition periods in a transmission channel having a limited bandwidth, said receiver comprising a store means for cyclically meshing storage of the transmitted sIgnals, and means for coupling the store means to the transmission channel during a number of signal repetition periods which is equal to a number of signal transition counts for the cyclically meshing signal storage.
Claim 16
Dependent Claim
70 words
A receiver for receiving a high frequency signal cyclically transmitted in signal repetition periods in a transmission channel having a limited bandwidth, said receiver comprising a store means for cyclically meshing storage of the transmitted sIgnals, and means for coupling the store means to the transmission channel during a number of signal repetition periods which is equal to a number of signal transition counts for the cyclically meshing signal storage.
Claim 17
Dependent Claim
25 words
A receiver as claimed in claim 13, wherein the store means comprises a disc memory connected through a frequency demodulator to a television display apparatus.
Claim 18
Dependent Claim
26 words
A receiver as claimed in claim 13, wherein the store means comprises a disc memory is connected through a frequency demodulator to a facsimile printing device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |