Patent US4584691A successfully refreshed from Google Patents.
US4584691A
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Timed pulse communication system
Assignee: Individual
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Filing: 1983-08-15
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Granted: 1986-04-22
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Expires: 2003-08-15
Abstract
Abstract A modulator and demodulator is described for a carrier frequency which is modulated by continuous pulses of different lengths time-wise, as many different lengths being provided as the number of letters, numbers, signs or even words require. The pulse generator comprises a stable oscillator and cycle counters which are controlled by a typewriter-type keyboard. The counters count cycles corresponding in aggregate duration to selected characters. Continuous pulses of duration equal to the aggregate durations of the counted cycles are generated in response to those counters. The receiver comprises a stable oscillator identical with that of the pulse generator, which is gated by the modulated carrier frequency. Cycle counters count the cycles in the gated pulses, and a read-only memory and display transform the counts into characters.
Inventors
- 👤 Ernest A. Herr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H03; H03K; H03K7/00; H03K7/08; H03K9/00; H03K9/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A pulse originator for a timed pulse communication system comprising a stable fixed oscillator, oscillator output cycle counting means connecting said oscillator with data selecting means, alphanumeric keyboard controlled means for terminating the cycle count through said data selecting means and for generating a continuous pulse of duration equal to the aggregate duration of said counted cycles, first means for gating the output of said fixed oscillator into said output cycle counting means and second means for gating said output pulse into said pulse originator output, both of said gating means being connected with each key of said keyboard, whereby an output pulse corresponding to a unique number of cycles is selected by depressing any key of said keyboard.
Claim 2
Dependent Claim
119 words
A pulse originator for a timed pulse communication system comprising a stable fixed oscillator, oscillator output cycle counting means connecting said oscillator with data selecting means, alphanumeric keyboard controlled means for terminating the cycle count through said data selecting means and for generating a continuous pulse of duration equal to the aggregate duration of said counted cycles, first means for gating the output of said fixed oscillator into said output cycle counting means and second means for gating said output pulse into said pulse originator output, both of said gating means being connected with each key of said keyboard, whereby an output pulse corresponding to a unique number of cycles is selected by depressing any key of said keyboard.
Claim 3
Dependent Claim
26 words
Apparatus of claim 1 including third gating means connected with each key of said keyboard for transmitting a clearing signal to said output cycle counting means.
Claim 4
Dependent Claim
36 words
Apparatus of claim 2 in which each key of said keyboard operates a separate make-and-break switch and means for providing a strobe signal synchronous with said switch operation to said first, second and third gating means.
Claim 5
Dependent Claim
24 words
Apparatus of claim 2 in which the said means are NAND gates having one input of each connected with each key of said keyboard.
Claim 6
Dependent Claim
120 words
Apparatus of claim 1 including first, second and third NAND gates, first and second means actuated by depression of any key of said keyboard connecting one input of said second gate to said data selector and connecting the other input of said second gate and one input of said first gate and one input of said third gate to ground, respectively, means connecting the other input of said first gate with said oscillator, means connecting the output of said first gate with said counter, means connecting the output of said second gate with the other input of said third gate and with the clear terminal of said counter, and an output connection for said output pulse from said third gate.
Claim 7
Dependent Claim
24 words
Apparatus of claim 1 in which said second means include means for generating a strobe signal simultaneously with the actuation of said first means.
Claim 8
Dependent Claim
64 words
A receiver for timed pulse communication systems using the pulse originator of claim 1 comprising a stable local oscillator of the same frequency as the oscillator of the transmitter pulse originator, local oscillator output cycle counting means connecting said local oscillator with a read-only memory, display means connected with said read-only memory and means for gating the said local oscillator by the received signals.
References Cited (Backward Citations)
US2345987A
Cited
US3699254A
Cited
US3845473A
Cited
US3781874A
Cited
US3983325A
Cited
US3944982A
Cited
US3949199A
Cited
US4189713A
Cited
US3980960A
Cited
US4188581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |