US3320535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitted signal two tone difference controlled single sideband squelch and avc system
Assignee: Collins Radio Co
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Filing: 1965-01-04
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Granted: 1967-05-16
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Samuel L Broadhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:07
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02; H04L27/08; H03; H03G; H03G3/00; H03G3/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
IN A RADIO FREQUENCY SINGLE SIDEBAND TRANSMITTING AND RECEIVING SYSTEM UTILIZING A TWO FREQUENCY TONE AND FREQUENCY DIFFERENCE TONE SIGNAL TRANSMISSION FOR DEVELOPING A CONTROL VOLTAGE IN THE RECEIVER USEFUL FOR A SQUELCH AND/OR AUTOMATIC VOLUME CONTROL, INCLUDING: A SINGLE SIDEBAND TRANSMITTER HAVING AN AUDIO INPUT SOURCE AND AN IF FREQUENCY SOURCE INPUT TO A BALANCED MODULATOR AND, IN ADDITION, TWO FREQUENCY TONE INPUTS FROM A DUAL FREQUENCY TONE SIGNAL SOURCE TO THE BALANCED MODULATOR; AND INCLUDING RF OUTPUT SIGNAL RADIATING ANTENNA MEANS; A SINGLE SIDEBAND RECEIVER INCLUDING A RADIATED RF SIGNAL RECEIVING ANTENNA; AN IF AMPLIFIER SECTION PROVIDING AN OUTPUT TO A SIDEBAND DETECTOR; IF SIGNAL SOURCE CARRIER INSERTION MEANS FOR SAID SIDEBAND DETECTOR CONNECTED TO PROVIDE AN OUTPUT TO AUDIO OUTPUT CIRCUIT MEANS; SAID IF AMPLIFIER ALSO CONNECTED FOR PROVIDING AN OUTPUT TO AN AM DETECTOR; THE OUTPUT OF SAID AM DETECTOR BEING CONNECTED TO A FILTER CAPABLE OF PASSING A FREQUENCY TONE EQUAL TO THE DIFFERENCE BETWEEN THE TWO TONE FREQUENCIES APPLIED AS INPUTS TO THE BALANCED MODULATOR OF SAID TRANSMITTER; AND MEANS FOR UTILIZING THE OUTPUT OF SAID FILTER AS A CONTROL VOLTAGE FOR SAID RECEIVER.
Claim 2
Dependent Claim
190 words
IN A RADIO FREQUENCY SINGLE SIDEBAND TRANSMITTING AND RECEIVING SYSTEM UTILIZING A TWO FREQUENCY TONE AND FREQUENCY DIFFERENCE TONE SIGNAL TRANSMISSION FOR DEVELOPING A CONTROL VOLTAGE IN THE RECEIVER USEFUL FOR A SQUELCH AND/OR AUTOMATIC VOLUME CONTROL, INCLUDING: A SINGLE SIDEBAND TRANSMITTER HAVING AN AUDIO INPUT SOURCE AND AN IF FREQUENCY SOURCE INPUT TO A BALANCED MODULATOR AND, IN ADDITION, TWO FREQUENCY TONE INPUTS FROM A DUAL FREQUENCY TONE SIGNAL SOURCE TO THE BALANCED MODULATOR; AND INCLUDING RF OUTPUT SIGNAL RADIATING ANTENNA MEANS; A SINGLE SIDEBAND RECEIVER INCLUDING A RADIATED RF SIGNAL RECEIVING ANTENNA; AN IF AMPLIFIER SECTION PROVIDING AN OUTPUT TO A SIDEBAND DETECTOR; IF SIGNAL SOURCE CARRIER INSERTION MEANS FOR SAID SIDEBAND DETECTOR CONNECTED TO PROVIDE AN OUTPUT TO AUDIO OUTPUT CIRCUIT MEANS; SAID IF AMPLIFIER ALSO CONNECTED FOR PROVIDING AN OUTPUT TO AN AM DETECTOR; THE OUTPUT OF SAID AM DETECTOR BEING CONNECTED TO A FILTER CAPABLE OF PASSING A FREQUENCY TONE EQUAL TO THE DIFFERENCE BETWEEN THE TWO TONE FREQUENCIES APPLIED AS INPUTS TO THE BALANCED MODULATOR OF SAID TRANSMITTER; AND MEANS FOR UTILIZING THE OUTPUT OF SAID FILTER AS A CONTROL VOLTAGE FOR SAID RECEIVER.
Claim 3
Dependent Claim
153 words
IN A RADIO FREQUENCY SINGLE SIDEBAND RECEIVER CAPABLE OF RESPONDING TO A PREDETERMINED FREQUENCY DIFFERENCE TONE SIGNAL EQUAL TO THE DIFFERENCE BETWEEN TWO RECEIVED FREQUENCY TONES MODULATED ON A RECEIVED RADIO FREQUENCY SINGLE SIDEBAND TRANSMISSION FOR DEVELOPING A CONTROL VOLTAGE IN THE RECEIVER USEFUL FOR A SQUELCH AND/OR AUTOMATIC VOLUME CONTROL, INCLUDING: IN THE SINGLE SIDEBAND RF RECEIVER A RADIATED RF SIGNAL RECEIVING ANTENNA; AN IF AMPLIFIER SECTION PROVIDING AN OUTPUT TO A SIDEBAND DETECTOR; IF SIGNAL SOURCE CARRIER INSERTION MEANS FOR SAID SIDEBAND DETECTOR; SAID SIDEBAND DETECTOR CONNECTED TO PROVIDE AN OUTPUT TO UTILIZING CIRCUIT MEANS; SAID IF AMPLIFIER ALSO CONNECTED FOR PROVIDING AN OUTPUT TO AN AM DETECTOR; THE OUTPUT OF SAID AM DETECTOR BEING CONNECTED TO A FILTER PASSING SAID PREDETERMINED FREQUENCY DIFFERENCE TONE EQUAL TO THE DIFFERENCE BETWEEN SAID TWO RECEIVED FREQUENCY TONES; AND MEANS FOR UTILIZING THE OUTPUT OF SAID FILTER AS A CONTROL VOLTAGE FOR SAID RECEIVER.
Claim 4
Dependent Claim
153 words
IN A RADIO FREQUENCY SINGLE SIDEBAND RECEIVER CAPABLE OF RESPONDING TO A PREDETERMINED FREQUENCY DIFFERENCE TONE SIGNAL EQUAL TO THE DIFFERENCE BETWEEN TWO RECEIVED FREQUENCY TONES MODULATED ON A RECEIVED RADIO FREQUENCY SINGLE SIDEBAND TRANSMISSION FOR DEVELOPING A CONTROL VOLTAGE IN THE RECEIVER USEFUL FOR A SQUELCH AND/OR AUTOMATIC VOLUME CONTROL, INCLUDING: IN THE SINGLE SIDEBAND RF RECEIVER A RADIATED RF SIGNAL RECEIVING ANTENNA; AN IF AMPLIFIER SECTION PROVIDING AN OUTPUT TO A SIDEBAND DETECTOR; IF SIGNAL SOURCE CARRIER INSERTION MEANS FOR SAID SIDEBAND DETECTOR; SAID SIDEBAND DETECTOR CONNECTED TO PROVIDE AN OUTPUT TO UTILIZING CIRCUIT MEANS; SAID IF AMPLIFIER ALSO CONNECTED FOR PROVIDING AN OUTPUT TO AN AM DETECTOR; THE OUTPUT OF SAID AM DETECTOR BEING CONNECTED TO A FILTER PASSING SAID PREDETERMINED FREQUENCY DIFFERENCE TONE EQUAL TO THE DIFFERENCE BETWEEN SAID TWO RECEIVED FREQUENCY TONES; AND MEANS FOR UTILIZING THE OUTPUT OF SAID FILTER AS A CONTROL VOLTAGE FOR SAID RECEIVER.
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 |