US3868599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single sideband frequency modulation system
Assignee: Xerox Ltd
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Filing: 1973-12-17
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Granted: 1975-02-25
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Expires: 1993-12-17
Abstract
Abstract A single sideband frequency modulation system wherein an input signal is divided into high and low-frequency components. The high-frequency component is transmitted as single sideband frequency modulation, and the low-frequency component is transmitted as standard frequency modulation.
Inventors
- 👤 Takashi Hirasaki
- 👤 Gojiro Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03C3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
Apparatus for modulating an input signal comprising means separating said input signal into a high-frequency component signal and a low-frequency component signal, means supplying a carrier signal, means frequency modulating said carrier signal with said lowfrequency component signal, means single sideband frequency modulating said carrier signal with said high frequency component signal, and means combining the low-frequency modulated carrier with the high-frequency modulated carrier.
Claim 2
Dependent Claim
64 words
Apparatus for modulating an input signal comprising means separating said input signal into a high-frequency component signal and a low-frequency component signal, means supplying a carrier signal, means frequency modulating said carrier signal with said lowfrequency component signal, means single sideband frequency modulating said carrier signal with said high frequency component signal, and means combining the low-frequency modulated carrier with the high-frequency modulated carrier.
Claim 3
Dependent Claim
113 words
Apparatus for modulating an input signal comprising a first phase shifter circuit, a second phase shifter circuit, means applying said input signal to said first and second phase shifter circuits, said first and second phase shifter circuits providing output signals phase shifted 90* relative to each other, means supplying a carrier signal, means frequency modulating said carrier signal with the output of said first phase shifter circuit, means providing a high-frequency component signal from the output of said second phase shifter circuit, means integrating said high-frequency component signal, means generating an exponential function signal from said integrated high-frequency component signal, and means amplitude modulating said frequency modulated carrier with said exponential function signal.
Claim 4
Dependent Claim
113 words
Apparatus for modulating an input signal comprising a first phase shifter circuit, a second phase shifter circuit, means applying said input signal to said first and second phase shifter circuits, said first and second phase shifter circuits providing output signals phase shifted 90* relative to each other, means supplying a carrier signal, means frequency modulating said carrier signal with the output of said first phase shifter circuit, means providing a high-frequency component signal from the output of said second phase shifter circuit, means integrating said high-frequency component signal, means generating an exponential function signal from said integrated high-frequency component signal, and means amplitude modulating said frequency modulated carrier with said exponential function signal.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |