US3320547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency synthesis
Assignee: Plessey Overseas Ltd
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Filing: 1965-10-06
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Granted: 1967-05-16
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Expires: 1985-10-06
Abstract
No abstract record available.
Inventors
- 👤 Standford Richard Thoma Albert
- 👤 Poulett Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/02; H03B21/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A CIRCUIT ARRANGEMENT FOR GENERATING A RANDOM FREQUENCY SPECTRUM WITHIN A RANGE OF FREQUENCIES, COMPRISING A MODULATOR, SWITCH MEANS, HAVING TWO ALTERNATIVE CONDITIONS, FOR SELECTIVELY APPLYING ONE OF FIRST AND SECOND PREDETERMINED DIFFERENT FREQUENCIES TO SAID MODULATOR, THE FIRST FREQUENCY HAVING AN UPPER SIDE BAND AND THE SECOND FREQUENCY HAVING A LOWER SIDE BAND, WHICH UPPER AND LOWER SIDE BANDS OVERLAP EACH OTHER, A BAND PASS FILTER CONNECTED TO THE OUTPUT FROM SAID MODULATOR AND HAVING A PASS BAND SUBSTANTIALLY COINCIDING WITH SAID OVERLAPPING UPPER AND LOWER SIDE BANDS, A FEEDBACK PATH FROM THE OUTPUT OF SAID BAND PASS FILTER TO SAID MODULATOR, AND A FREQUENCY DIVIDER HAVING A VARIABLE DIVISOR IN SAID FEEDBACK PATH, SUCH THAT VARIATION IN THE DIVISOR OF SAID FREQUENCY DIVIDER AND CHANGES IN THE CONDITION OF SAID SWITCH MEANS ENABLE A RANDOM SPECTRUM TO BE GENERATED BY SAID CIRCUIT ARRANGEMENT WITHIN THE PASS BAND OF SAID FILTER.
Claim 2
Dependent Claim
152 words
A CIRCUIT ARRANGEMENT FOR GENERATING A RANDOM FREQUENCY SPECTRUM WITHIN A RANGE OF FREQUENCIES, COMPRISING A MODULATOR, SWITCH MEANS, HAVING TWO ALTERNATIVE CONDITIONS, FOR SELECTIVELY APPLYING ONE OF FIRST AND SECOND PREDETERMINED DIFFERENT FREQUENCIES TO SAID MODULATOR, THE FIRST FREQUENCY HAVING AN UPPER SIDE BAND AND THE SECOND FREQUENCY HAVING A LOWER SIDE BAND, WHICH UPPER AND LOWER SIDE BANDS OVERLAP EACH OTHER, A BAND PASS FILTER CONNECTED TO THE OUTPUT FROM SAID MODULATOR AND HAVING A PASS BAND SUBSTANTIALLY COINCIDING WITH SAID OVERLAPPING UPPER AND LOWER SIDE BANDS, A FEEDBACK PATH FROM THE OUTPUT OF SAID BAND PASS FILTER TO SAID MODULATOR, AND A FREQUENCY DIVIDER HAVING A VARIABLE DIVISOR IN SAID FEEDBACK PATH, SUCH THAT VARIATION IN THE DIVISOR OF SAID FREQUENCY DIVIDER AND CHANGES IN THE CONDITION OF SAID SWITCH MEANS ENABLE A RANDOM SPECTRUM TO BE GENERATED BY SAID CIRCUIT ARRANGEMENT WITHIN THE PASS BAND OF SAID FILTER.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |