US3823385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote control system utilizing f.s.k.and frequency sequence discriminator means
Assignee: Panasonic Holdings Corp
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Filing: 1973-02-26
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Granted: 1974-07-09
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Expires: 1993-02-26
Abstract
Abstract A remote control system using a signal consisting of portions of mutually different frequencies. The transmitter unit transmits a continuous signal which is formed by changing the frequency of the signal at a predetermined period. The receiver unit receives this continuous signal, and discriminates the frequency, taking the AND output of this discriminated signal and a delayed signal thereof to obtain a control signal. The transmitter unit comprises a simple structure consisting of a signal generator capable of generating signals of different frequencies, whereas the receiver unit can prevent errors in the operation of the control due to noises etc.
Inventors
- 👤 T Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:00
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; G; G08; G08C; G08C19/00; G08C19/12; G08C19/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
192 words
A remote control system, including means to transmit a continuous signal composed of two mutually distinct frequencies f1 and f2 which alternate at least once during a predetermined time period, and means to receive said continuous signal transmitted by said transmitting means, said receiving means comprising: frequency discriminating means, having an S-shaped characteristic curve, for generating a first output signal of one polarity when a signal of frequency f1 is received by said receiving means and for generating a second output signal of opposite polarity from said first output signal when a signal of frequency f2 is received by said receiving means; a delay circuit coupled to the output of said frequency discriminating means, said delay circuit including means triggered by said first output signal to generate a third output signal; and a logic circuit having a first input coupled to the output of said frequency discriminating means for receiving said second output signal and a second input coupled to the output of said delay circuit, said logic circuit including means generating an output signal only when an input signal is present on both of said first and second logic circuit inputs.
Claim 2
Dependent Claim
192 words
A remote control system, including means to transmit a continuous signal composed of two mutually distinct frequencies f1 and f2 which alternate at least once during a predetermined time period, and means to receive said continuous signal transmitted by said transmitting means, said receiving means comprising: frequency discriminating means, having an S-shaped characteristic curve, for generating a first output signal of one polarity when a signal of frequency f1 is received by said receiving means and for generating a second output signal of opposite polarity from said first output signal when a signal of frequency f2 is received by said receiving means; a delay circuit coupled to the output of said frequency discriminating means, said delay circuit including means triggered by said first output signal to generate a third output signal; and a logic circuit having a first input coupled to the output of said frequency discriminating means for receiving said second output signal and a second input coupled to the output of said delay circuit, said logic circuit including means generating an output signal only when an input signal is present on both of said first and second logic circuit inputs.
Claim 3
Dependent Claim
108 words
The system according to claim 1, wherein said transmitting means comprises: an oscillator, including a resonant circuit for generating a signal of frequency f1; frequency changing means for changing the resonant frequency of said resonant circuit to generate a signal of frequency f2; and switching means coupled to said frequency changing means to selectively engage and disengage said frequency changing means with and from said resonant circuit, respectively, said switching means comprising a charging capacitor, a switch element coupled to said capacitor and switched when the terminal voltage of said capacitor reaches a predetermined threshold, and a further switch element coupling said charging capacitor to a voltage source.
Claim 4
Dependent Claim
63 words
The system according to claim 1, wheRein said receiving means further comprises a bandpass amplifier for passing only those signals received by said receiving means which are within a predetermined bandwidth and which include said frequencies f1 and f2; and limiter means interposed between said bandpass amplifier and said frequency discriminating means for limiting the amplitude of the output of said bandpass amplifier.
Claim 5
Dependent Claim
39 words
A remote control system according to claim 1, wherein said delay circuit includes a monostable multivibrator which is triggered only by a signal having one of positive and negative polarities to generate a pulse of a predetermined pulse width.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |