US3706945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplitude-modulated eight-phase phase-modulation system
Assignee: KDDI Corp
•
Filing: 1971-08-16
•
Granted: 1972-12-19
•
Expires: 1991-08-16
Abstract
Abstract A multiple modulation system for obtaining an amplitudemodulated eight-phase phase-modulated wave employed for transmitting three channels of binary information, in which the amplitude of an eight-phase phase-modulated wave is deviated by substantially six decibels when the eight-phase phase-modulated wave assumes any of four phase-positions alternately predetermined from possible eight-phase positions.
Inventors
- 👤 Hidetaka Yanagidaira
- 👤 Sotokichi Shintani
- 👤 Hisakichi Michishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/361
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
An amplitude-modulated phase-modulation system, comprising oscillation means for generating a carrier wave, input terminal means for receiving and applying three binary input signals; phase modulation means connected to the oscillation means and the input terminal means for eight-phase phase-modulating the carrier wave in accordance with combinations of respective states of the three binary signals; amplitude modulation means connected to the phase modulation means; and control means connected to the input terminal means and the amplitude modulation means for controlling the amplitude modulation to deviate, by substantially six decibels, the output of the phase modulation means when the output of the phase modulation means assumes any of four phase-positions alternately predetermined from possible eight-phase positions.
Claim 2
Dependent Claim
114 words
An amplitude-modulated phase-modulation system, comprising oscillation means for generating a carrier wave, input terminal means for receiving and applying three binary input signals; phase modulation means connected to the oscillation means and the input terminal means for eight-phase phase-modulating the carrier wave in accordance with combinations of respective states of the three binary signals; amplitude modulation means connected to the phase modulation means; and control means connected to the input terminal means and the amplitude modulation means for controlling the amplitude modulation to deviate, by substantially six decibels, the output of the phase modulation means when the output of the phase modulation means assumes any of four phase-positions alternately predetermined from possible eight-phase positions.
Claim 3
Dependent Claim
55 words
An amplitude-modulated phase-modulation system according to claim 1, in which the phase modulation means comprises means for generating from the carrier wave eight rectangular waves respectively having eight different phase positions, and selection means for selecting one of the eight rectangular waves in accordance with combinations of respective states of the three binary input signals.
Claim 4
Dependent Claim
71 words
An amplitude-modulated phase-modulation system, according to claim 2, in which the phase-modulation means comprises a Schmidt trigger circuit for converting the carrier wave to a rectangular wave, a scale-of-8 counter connected to the Schmidt trigger circuit for counting pulses of the rectangular wave, a matrix connected to three stages of the scale-of-8 counter, four bistable circuits connected respectively four pairs of outputs of the matrix to produce the eight rectangular waves.
Claim 5
Dependent Claim
65 words
An amplitude-modulated phase-modulation system according to claim 2, in which the selection means comprises a matrix connected to the input terminal means for generating eight control outputs respectively corresponding to eight possible combinations of the respective states of the three input signals, and eight gates respectively controlled by the eight control outputs of the matrix for gating a corresponding one of the eight rectangular waves.
Claim 6
Dependent Claim
45 words
An amplitude-modulated phase-modulation system according to claim 1, in which the phase-modulation means comprises three phase shifters having respectively phase shift angles pi , pi /2, and pi /4 and connected in cascade, the three inpUt signals being respectively controlled by the three input signals.
Claim 7
Dependent Claim
94 words
An amplitude-modulated phase-modulated system according to claim 1, in which the phase modulation means comprises means for phase-modulating the carrier wave, by two of the three input signals, to obtain two four-phase phase-modulated waves whose phase positions have each a phase difference of pi /4 from adjacent ones of possible four phase positions of another one, and selection means for selecting one of the two four-phase phase-modulated waves in accordance with the state of the remainder of the three input signals, and in which the control means is combined with the phase modulation means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |