Remote control circuit
First Claim
1. A remote control circuit for controlling one or more functions in a device, said circuit comprising a transmitter for transmitting control signal pulses and a receiver for receiving and evaluating said pulses, wherein the transmitter comprises(a) a monostable multivibrator for generating a cyclically repetitive train of pulses at determinable intervals and comprising two complementary transistors and a resistive-capacitive coupling, the collector of a first one of said of transistors being connected to the base of the second one of said transistors and the collector of said second transistor being coupled to the base of said first transistor by way of said resistive-capacitive coupling;
- (b) switching means;
(c) pulse interval determining means for determining different pulse intervals for said train and corresponding in number to the number of said functions and controllable by said switching means to cause a control signal pulse transmission of the transmitter to have a selected one of said intervals; and
(d) signal pulse transmitting means connected to the collector of said second transistor to provide a control signal pulse transmission with the selected pulse interval; and
wherein the receiver comprises(a) signal pulse receiving means for receiving signal pulse transmissions from said signal pulse transmitting means;
(b) a resistor-capacitor charging circuit in which the capacitor is so chargeable via the resistor and dischargeable by each pulse of a received signal pulse transmission as to provide an output sawtooth voltage having a peak magnitude dependent on the selected pulse interval;
(c) a filter stage connected to said resistor-capacitor charging circuit to filter said output voltage thereof; and
(d) a voltage level detecting stage connected to said filter stage to detect the level of the voltage filtered by said stage and to control a respective function of said device which is associated with the detected voltage level.
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Accused Products
Abstract
A remote control circuit for the control of one or more functions of a device, for example a toy or transparency projector, comprises a transmitter for transmitting control signal pulses and a receiver for evaluating the transmitted pulses, the design of the transmitter being such that the number of its components and its consumption of current are minimized. The transmitter accordingly comprises a monostable multivibrator with two complementary transistors. The collector of the first transistor is connected to the base of the second transistor, and the collector of the second transistor is connected to a signal pulse transmitting component, for example an infrared diode, and through a resistance-capacitance coupling to the base of the first transistor. Also connected to the base of the first transistor is a number of components determining different pulse intervals and corresponding in number to the functions to be controlled. The components can be individually switched in by respective switches. The receiver comprises a resistor-capacitor charging-circuit adapted to provide a sawtooth voltage dependent on the pulse intervals and a voltage level detecting stage for detecting different voltage levels and selectively controlling the functions in dependence on detected levels.
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Citations
10 Claims
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1. A remote control circuit for controlling one or more functions in a device, said circuit comprising a transmitter for transmitting control signal pulses and a receiver for receiving and evaluating said pulses, wherein the transmitter comprises
(a) a monostable multivibrator for generating a cyclically repetitive train of pulses at determinable intervals and comprising two complementary transistors and a resistive-capacitive coupling, the collector of a first one of said of transistors being connected to the base of the second one of said transistors and the collector of said second transistor being coupled to the base of said first transistor by way of said resistive-capacitive coupling; -
(b) switching means; (c) pulse interval determining means for determining different pulse intervals for said train and corresponding in number to the number of said functions and controllable by said switching means to cause a control signal pulse transmission of the transmitter to have a selected one of said intervals; and (d) signal pulse transmitting means connected to the collector of said second transistor to provide a control signal pulse transmission with the selected pulse interval; and wherein the receiver comprises (a) signal pulse receiving means for receiving signal pulse transmissions from said signal pulse transmitting means; (b) a resistor-capacitor charging circuit in which the capacitor is so chargeable via the resistor and dischargeable by each pulse of a received signal pulse transmission as to provide an output sawtooth voltage having a peak magnitude dependent on the selected pulse interval; (c) a filter stage connected to said resistor-capacitor charging circuit to filter said output voltage thereof; and (d) a voltage level detecting stage connected to said filter stage to detect the level of the voltage filtered by said stage and to control a respective function of said device which is associated with the detected voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification