Patent US3885216A successfully refreshed from Google Patents.
US3885216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimode communication system with freeze circuit
Assignee: Individual
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Filing: 1973-10-19
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Granted: 1975-05-20
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Expires: 1993-10-19
Abstract
Abstract A communication system using radio telephone send-receive components. A main station, such as a shore based radio telephone, is equipped to receive and analyze the signals received from a boat and determine its modulation mode, whether amplitude modulation, frequency modulation, or single side band transmission. When the modulation mode has been established, the main station transmitter mode is adjusted to match the received mode and the circuit is frozen to such a mode for the remainder of the message, regardless of noise, or other received signals.
Inventors
- 👤 Leonard R Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:55
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A switching control circuit for switching a transmit-receive circuit into a latching condition in one of two modulation modes responsive to the sensed mode of the received signal comprising: a. a first normally conducting gate circuit for receiving the sensed mode signal and for delivering a signal when the amplitude modulation wave is sensed; b. a storage capacitor connected to the first gate circuit for collecting and holding a charge when a signal is passed by the first gate circuit; c. a comparison circuit coupled to the storage capacitor for comparing the voltage it produces with a reference voltage; d. a second normally conducting gate connected to the comparison circuit for transmitting the sensed mode signal; and, e. switching means including a bistable multivibrator coupled to the comparison circuit in series with the second gate circuit for latching the multivibrator into a conductance condition which applies a signal to the transmit-receive circuit to cause the transmit portion to operate in the mode of the received signal.
Claim 2
Dependent Claim
166 words
A switching control circuit for switching a transmit-receive circuit into a latching condition in one of two modulation modes responsive to the sensed mode of the received signal comprising: a. a first normally conducting gate circuit for receiving the sensed mode signal and for delivering a signal when the amplitude modulation wave is sensed; b. a storage capacitor connected to the first gate circuit for collecting and holding a charge when a signal is passed by the first gate circuit; c. a comparison circuit coupled to the storage capacitor for comparing the voltage it produces with a reference voltage; d. a second normally conducting gate connected to the comparison circuit for transmitting the sensed mode signal; and, e. switching means including a bistable multivibrator coupled to the comparison circuit in series with the second gate circuit for latching the multivibrator into a conductance condition which applies a signal to the transmit-receive circuit to cause the transmit portion to operate in the mode of the received signal.
Claim 3
Dependent Claim
36 words
A control circuit according to claim 1 wherein said first gate is connected to a squelch control circuit for making the gate nonconductive when a squelch signal is received due to the absence of a signal.
Claim 4
Dependent Claim
34 words
A control circuit according to claim 1 wherein said second gate is connected to a squelch control circuit in series with a diode for making the gate nonconductive when a squelch signal is received.
Claim 5
Dependent Claim
53 words
A control circuit according to claim 1 wherein a voltage reference is applied to one side of the first storage capacitor and to the comparison circuit for comparison with the input signal and to produce a positive voltage when one signal is received and a negative signal when a second signal is received.
Claim 6
Dependent Claim
35 words
A control circuit according to claim 1 wherein a freeze voltage circuit is coupled to a plurality of circuit components for disabling their action and for maintaining the multivibrator circuit in its last operated condition.
Claim 7
Dependent Claim
16 words
A switching circuit according to claim 1 wherein both of said gates are field effect transistors.
Claim 8
Independent Claim
82 words
A method of temporarily disabling a switching control circuit in a transmit-rEceive communications system which includes; determining the modulation mode of the received signal by electrical means; developing an electrical signal responsive to the sensed modulation mode; applying the electrical signal to a latching circuit to maintain a control voltage responsive to the modulation mode of the received signal; and applying a freezing voltage to the latching circuit to maintain the receiving circuit in its operated condition for a desired time interval.
Claim 9
Independent Claim
82 words
A method of temporarily disabling a switching control circuit in a transmit-rEceive communications system which includes; determining the modulation mode of the received signal by electrical means; developing an electrical signal responsive to the sensed modulation mode; applying the electrical signal to a latching circuit to maintain a control voltage responsive to the modulation mode of the received signal; and applying a freezing voltage to the latching circuit to maintain the receiving circuit in its operated condition for a desired time interval.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |