Trainable RF transmitter including attenuation control
First Claim
Patent Images
1. A trainable transmitter for learning and transmitting an activation signal that includes an RF carrier frequency modulated with a code for remotely actuating a device, said trainable transmitter comprising:
- a controller operable in a learning and an operating mode, said controller receiving the activation signal in said learning mode for storing data corresponding to the radio frequency and code of the activation signal, and in said operating mode, providing an output signal, which identifies the radio frequency and code of the received activation signal, and an attenuation control signal;
a signal generator coupled to said controller, for receiving said output signal for outputting a modulated radio frequency carrier signal corresponding to the received activation signal; and
an attenuator, coupled to said signal generator and to said controller, for receiving the attenuation control signal from said controller, for attenuating the modulated radio frequency carrier signal received from said signal generator at an attenuation level indicated by the attenuation control signal, and for transmitting an attenuated output signal to the device.
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Abstract
A transmitter includes an attenuator for adjusting the level of an output signal as a function of the pulse width and frequency of the output signal. The transmitter also includes receiver components which are disabled when the transmitter is transmitting.
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Citations
26 Claims
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1. A trainable transmitter for learning and transmitting an activation signal that includes an RF carrier frequency modulated with a code for remotely actuating a device, said trainable transmitter comprising:
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a controller operable in a learning and an operating mode, said controller receiving the activation signal in said learning mode for storing data corresponding to the radio frequency and code of the activation signal, and in said operating mode, providing an output signal, which identifies the radio frequency and code of the received activation signal, and an attenuation control signal; a signal generator coupled to said controller, for receiving said output signal for outputting a modulated radio frequency carrier signal corresponding to the received activation signal; and an attenuator, coupled to said signal generator and to said controller, for receiving the attenuation control signal from said controller, for attenuating the modulated radio frequency carrier signal received from said signal generator at an attenuation level indicated by the attenuation control signal, and for transmitting an attenuated output signal to the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for learning and transmitting an activation signal that remotely actuates a device using a trainable transmitter, comprising the steps of:
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receiving the activation signal in a learning mode; generating radio frequency control data, which indicates a detected radio frequency carrier of the received activation signal, and attenuation control data, which indicates an attenuation level; generating an output signal having a radio frequency carrier corresponding to that of the received activation signal; attenuating the output signal at the attenuation level indicated by the attenuation control data; and transmitting the attenuated output signal to the device. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A trainable transmitter for learning and transmitting an activation signal that includes an RF carrier frequency modulated with a code for remotely actuating a device, said trainable transmitter comprising:
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a controller operable in a learning and an operating mode, said controller receiving the activation signal in said learning mode for storing data corresponding to the radio frequency and code of the activation signal, and, in said operating mode, providing an output signal, which identifies the radio frequency and code of the received activation signal, and an attenuation control signal; a signal generator, coupled to said controller, for receiving said output signal and for outputting a modulated radio frequency carrier signal corresponding to the received activation signal; an attenuator, coupled to said signal generator and to said controller, for receiving the attenuation control signal from said controller, for attenuating said modulated radio frequency carrier signal received from said signal generator at an attenuation level indicated by the attenuation control signal, and for transmitting an attenuated output signal to the device; and means for generating reference signals having different frequencies, said reference signal generating means controlled by a frequency control signal, wherein, in said learning mode, said reference signal generating means outputs reference signals at different frequencies, which are input to said controller, the frequency of said output reference signal being varied until said controller detects that the frequency of said reference signal and the frequency of the received activation signal are substantially equal. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification