US3590384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous pulse transmission system with selectable modulation mode
Assignee: US Philips Corp
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Filing: 1968-09-24
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Granted: 1971-06-29
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Expires: 1988-09-24
Abstract
Abstract A modulator for modulating a digital carrier with digital information pulses features logic gates, inverters and a switch. The switch has three positions for connecting the circuit into three different configurations for achieving AM, FM and PM. A digital filter is used in conjunction with the modulator for attenuating any possible undesired sidebands resulting from the modulation.
Inventors
- 👤 Petrus Josephus Van Gerwen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:28
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/2057; H04L27/0008; H04L27/02; H04L27/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A modulation device, comprising a source of digital information signals; first and second sources of digital carrier signals having different frequencies; a switch having a center contact and three positional contacts; one of said positional contacts being coupled to said second source of carrier signals; first and second AND gates, each having two inputs and one output; an OR gate having two inputs coupled to said AND gate outputs respectively and one output; one of said first AND gate inputs being coupled to said center contact; a first pair of conductors coupling said first carrier source to another of said positional contacts and one of said second AND gate inputs; a second pair of conductors coupling said information signal source to the remaining inputs of said AND gates; and first and second inverters coupled within one of said first and one of said second conductors.
Claim 2
Dependent Claim
145 words
A modulation device, comprising a source of digital information signals; first and second sources of digital carrier signals having different frequencies; a switch having a center contact and three positional contacts; one of said positional contacts being coupled to said second source of carrier signals; first and second AND gates, each having two inputs and one output; an OR gate having two inputs coupled to said AND gate outputs respectively and one output; one of said first AND gate inputs being coupled to said center contact; a first pair of conductors coupling said first carrier source to another of said positional contacts and one of said second AND gate inputs; a second pair of conductors coupling said information signal source to the remaining inputs of said AND gates; and first and second inverters coupled within one of said first and one of said second conductors.
Claim 3
Dependent Claim
50 words
A device as claimed in claim 1 wherein said first inverter is coupled within the conductor coupling said first carrier signal source and one said positional contacts, and said second inverter is coupled within the conductor coupling said information signals source to said remaining input of said second AND gate.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 1 further comprising a pulse generator and wherein said information and carrier signal sources are synchronized with said pulse generator.
Claim 5
Dependent Claim
21 words
A device as claimed in claim 3 further comprising a digital filter including a shift register synchronized with said pulse generator.
References Cited (Backward Citations)
US3406343A
Cited
US3467777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |