Patent US3798601A successfully refreshed from Google Patents.
US3798601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote control system
Assignee: US Philips Corp
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Filing: 1972-04-19
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Granted: 1974-03-19
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Expires: 1992-04-19
Abstract
Abstract An ultrasonic remote control system in which the influence of echoes on a pulse duration information transmission is prevented by using signals having a first and a second frequency and in which the occurrence of the signal having the first frequency determines the commencement of the pulse duration information and the occurrence of the signal having the second frequency determines the end of this information.
Inventors
- 👤 C Hulsbosch
- 👤 D Nederlof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:00
CPC Classifications
H; H03; H03J; H03J9/00; H03J9/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A remote control system employing ultrasonic pulse duration information transmitted from a transmitter to a receiver to provide remote control of a remotely controllable device coupled to the receiver, said system comprising a transmitter with means for transmitting a first ultrasonic signal of a first frequency, means for transmitting a second ultrasonic signal of a second frequency delayed in time from the transmission of the first signal as a function of the control information to be transmitted, and said receiver includes means responsive to said first and second signals to provide a control signal containing pulse duration information determined by the time difference between the transmission of said first and second signals.
Claim 2
Dependent Claim
112 words
A remote control system employing ultrasonic pulse duration information transmitted from a transmitter to a receiver to provide remote control of a remotely controllable device coupled to the receiver, said system comprising a transmitter with means for transmitting a first ultrasonic signal of a first frequency, means for transmitting a second ultrasonic signal of a second frequency delayed in time from the transmission of the first signal as a function of the control information to be transmitted, and said receiver includes means responsive to said first and second signals to provide a control signal containing pulse duration information determined by the time difference between the transmission of said first and second signals.
Claim 3
Dependent Claim
79 words
A remote control system as claimed in claim 1 wherein said transmitter further comprises, a generator circuit for generating ultrasonic signals of the first and of the second frequency, a frequency change-over circuit coupled to the generator circuit, a time delay circuit for determining the pulse duration information, and means for coupling said time delay circuit to the frequency change-over circuit for controlling the time at which the change of frequency from said first to said second frequency occurs.
Claim 4
Dependent Claim
31 words
A transmitter as claimed in claim 2 further comprising a number of function selection members each of which controls and corresponds to a different time delay of the time delay circuit.
Claim 5
Dependent Claim
34 words
A transmitter as claimed in claim 3 further comprising switching means coupling the generator to a source of supply voltage and including a supply switch coupled to each of the said function sElection members.
Claim 6
Dependent Claim
130 words
A remote control system as claimed in claim 1 wherein the receiver includes a first signal path coupled to the input of the receiver and having a first filter tuned to the first frequency and a second signal path coupled to the input of the receiver and having a second filter tuned to the second frequency, a gating circuit included in the first signal path, a first detection circuit having an input coupled to an output of the second signal path and an output coupled to an operating signal input of the gating circuit whereby receipt of the second signal of the second frequency in the second channel actuates the gating circuit in a manner to block the passage of a signal of the first frequency through said first channel.
Claim 7
Dependent Claim
87 words
A receiver as claimed in claim 5 further comprising, a second detection circuit coupled to an output of the first signal path, a counter having a reset input and a counting pulse input, means for coupling an output of the first detection circuit to the reset input of the counter, a clock pulse generator having an output connected to the counting pulse input of the counter, and means for coupling an operating signal input of said clock pulse generator to an output of the second detection circuit.
Claim 8
Dependent Claim
55 words
A receiver as claimed in claim 6, characterized in that the outputs of the counter are coupled to the first inputs of gating circuits which in turn are coupled to function selection circuits of the receiver, and means for coupling a second input of the gating circuits to an output of the first detection circuit.
Claim 9
Dependent Claim
92 words
A remote control system comprising, a transmitter including means for generating and transmitting, in sequence, first and second ultrasonic signals with first and second frequencies, respectively, and means for controlling the time delay between the transmission of said first and second signals as a function of a control parameter, a receiver remote from the transmitter including first and second means responsive to signals of said first and second frequencies, respectively, for deriving a control pulse the width of which is determined by the time delay between said first and second transmitted signals.
Claim 10
Dependent Claim
92 words
A remote control system comprising, a transmitter including means for generating and transmitting, in sequence, first and second ultrasonic signals with first and second frequencies, respectively, and means for controlling the time delay between the transmission of said first and second signals as a function of a control parameter, a receiver remote from the transmitter including first and second means responsive to signals of said first and second frequencies, respectively, for deriving a control pulse the width of which is determined by the time delay between said first and second transmitted signals.
Claim 11
Dependent Claim
85 words
A remote control system as claimed in claim 8 wherein said receiver control pulse deriving means comprises, first and second filters tuned to said first and second frequencies, respectively, a gating circuit for controlling the passage of said first signal from the first filter to a utilization device, and detection means coupled to the output of the second filter and responsive to a signal of the second frequency for operating said gating circuit to block the passage of said first signal to the utilization device.
Claim 12
Dependent Claim
45 words
A remote control system as claimed in claim 8 wherein said transmitter time delay control means comprises an adjustable time delay circuit and said transmitter further comprises means controlled by the time delay circuit for changing the frequency of the signal generated by the transmitter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |