US3647967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraphy receiver for harmonic telegraphy
Assignee: Telecommunications Radioelectriques et Telephoniques SA TRT
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Filing: 1970-02-25
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Granted: 1972-03-07
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Expires: 1990-02-25
Abstract
Abstract A multichannel telegraphy receiver for harmonic telegraphy where for each channel different levels of an input signal are characterized by different frequencies of the carrier. The receiver comprises for each receiver channel a discriminator including a digital counter, a continuously active counting pulse generator coupled to the input of the counter and a decoder connected to the counter and having an output circuit formed by a register. The register has a separate output for each of the different levels of the input signal. A zero-crossing detector in the input circuit of the receiver channel provides reset pulses to the counter and input pulses for the register.
Inventors
- 👤 Michel Guy Pierre Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:14
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04L5/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
A multichannel telegraphy receiver for harmonic telegraphy wherein for each channel different levels of the input signal are characterized by different frequencies of the carrier; each receiver channel comprising a discriminator including a digital counter; a continuously active counting pulse generator coupled to the input of the counter and comprising a pulse oscillator, a frequency divider connected to the pulse oscillator and having x divider stages, each of the output pulses of the divider being representative of a counter time increment t, the oscillator frequency being equal to F 2x/ Delta t; a decoder connected to the counter and comprising a register having a separate output for each of the different channel levels; a receiver channel input circuit, comprising a zero-crossing detector having output pulses, means for connecting the output pulses of the zerocrossing detector as reset pulses to the digital counter and means for applying the output pulses of the zero-crossing detector to the output register as readout pulses for reading the output of the decoder into the output line of the register corresponding to the input frequency of the carrier.
Claim 2
Dependent Claim
182 words
A multichannel telegraphy receiver for harmonic telegraphy wherein for each channel different levels of the input signal are characterized by different frequencies of the carrier; each receiver channel comprising a discriminator including a digital counter; a continuously active counting pulse generator coupled to the input of the counter and comprising a pulse oscillator, a frequency divider connected to the pulse oscillator and having x divider stages, each of the output pulses of the divider being representative of a counter time increment t, the oscillator frequency being equal to F 2x/ Delta t; a decoder connected to the counter and comprising a register having a separate output for each of the different channel levels; a receiver channel input circuit, comprising a zero-crossing detector having output pulses, means for connecting the output pulses of the zerocrossing detector as reset pulses to the digital counter and means for applying the output pulses of the zero-crossing detector to the output register as readout pulses for reading the output of the decoder into the output line of the register corresponding to the input frequency of the carrier.
Claim 3
Dependent Claim
36 words
A multichannel telegraphy receiver as claimed in claim 1, wherein the number of divider stages x of the frequency divider is chosen to be such that the oscillator frequency F is between 2 and 4 MHz.
Claim 4
Dependent Claim
108 words
A multichannel telegraphy receiver as claimed in claim 1 having three levels for each receiver channel which levels are characterized by the frequencies fo- Delta f, fo and fo+ Delta f respectively, wherein the discriminator is formed in such a manner that the following relations exist between the intervals of time tp, ts and tn corresponding to one period of the frequencies fo- Delta f, fo and fo+ Delta f, and the duration of one time increment Delta t: Delta t tsN and 4 Delta t tp-tn wherein N is equal to the number of counting positions successively passed by the counter during the interval of time ts.
Claim 5
Dependent Claim
107 words
A multichannel telegraphy receiver as claimed in claim 1 having three levels for each channel which levels are characterized by the frequencies fo- Delta f, fo and fo+ Delta f, respectively, wherein the discriminator is formed in such a manner that the following relations exist between the intervals of time tp, ts and tn corresponding to one period of the frequencies fo- Delta s, fo and fo+ Delta s, respectively, and the duration of one time increment t: Delta t ts/2N and 4 Delta t tp-tn/2 wherein N is equal to the number of counting positions successively passed by the counter during the interval of time ts.
References Cited (Backward Citations)
US3543172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |