Universal transmitter
OwnerPhilip Y.W. Tsuiinventor
Life of this patent
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Abstract
A method and apparatus for providing a universal transmitter that can detect and emulate a transmission signal of a transmitter, the transmission signal having a corresponding transmission frequency and a corresponding modulation pattern. The universal transmitter comprises: a detection circuit that detects a frequency and a modulation pattern of a transmitted signal of a separate transmitter and a memory. A processor coupled to the detection circuit and the memory, stores a frequency value representative of the detected frequency and a plurality of value representative of the detected modulation pattern, in the memory. A transmitting circuit coupled to the processor, is operable to transmit an output signal having the frequency and the modulation pattern of the transmission signal.
Claims14
A method of detecting and emulating a transmission signal of a transmitter, the transmission signal having a corresponding transmission frequency and a corresponding modulation pattern, the method comprising:
- receiving the transmission signal;
- conditioning the received signal to provide a signal having enhanced transitions;
- determining a number of said enhanced transitions;
- determining a plurality of timing intervals between each enhanced transition, each of said plurality of timing intervals corresponding to one of a first state and a second state;
- determining the transmission frequency and the modulation pattern based on the number of counts and the timing interval between each enhanced transition;
- storing the transmission frequency and the modulation pattern in memory;
- and
- transmitting an output signal having the transmission frequency and the modulation pattern, in response to an enable signal.
A universal transmitter, comprising:
- an antenna to receive a signal transmitted from another transmitter;
- a detection circuit coupled to the antenna, the detection circuit including:
- a wave shaping circuit coupled to the antenna, the wave shaping circuit to level shift and condition the received signal to provide enhanced transitions, and
- a wave envelope detection circuit coupled to the antenna, the wave envelope detection circuit to detect the envelope of the received signal for determining a plurality of timing intervals corresponding to the modulation pattern of the received signal;
- a processor coupled to the detection circuit, the processor to determine the frequency and the modulation pattern of the received signal based on the output of the wave shaping circuit and the output of the wave envelope detection circuit;
- a memory coupled to the processor, the processor to store a frequency value representative of the detected frequency and a plurality of values representative of the modulation pattern of the received signal, in the memory;
- and
- a transmitting circuit coupled to the processor, the transmitting circuit being operable to transmit an output signal having the frequency and modulation pattern of the received signal.
Dependencies are inferred from the claim text.