Method and apparatus for detecting a continuous LF wave signal
AssigneesTRW Automotive U.S. LLC, Michelin Recherche et Technique S.A.
InventorDino Bortolin
Life of this patent
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Abstract
An apparatus for detecting a continuous wave (CW) signal including a demodulator demodulating a received CW signal and providing a demodulated signal, an edge detector for detecting an edge of the demodulated signal and thereby, detecting the CW signal and a switchable short-circuit of the demodulator, edges being formed in the demodulated signal when the demodulator is temporarily short-circuited during receipt of the CW signal.
Claims19
An apparatus for detecting a continuous wave (CW) signal, the apparatus comprising:
- a demodulator demodulating a received CW signal and providing a demodulated signal;
- an edge detector for detecting an edge of the demodulated signal and thereby, detecting the CW signal;
- and
- a switchable short-circuit of the demodulator, edges being formed in the demodulated signal when the demodulator is temporarily short-circuited during receipt of the CW signal.
An apparatus for detecting a CW signal, the apparatus comprising:
- receiving means for receiving the CW signal;
- demodulating means for determining an envelope of the received CW signal;
- edge detecting means for detecting an edge of the envelope and thereby detecting the CW wave signal;
- and
- short-circuiting means for temporarily short-circuiting the demodulating means, edges being formed in the envelope when the demodulating means is temporarily short-circuited during the receipt of the CW signal.
A method for detecting and processing a CW signal, the method comprising:
- receiving a CW signal at an antenna;
- providing the CW wave to an input of a demodulator;
- providing an output of the demodulator to an edge detector;
- activating a short-circuiting switch to short-circuit the demodulator at predetermined periodical intervals;
- deactivating the short-circuiting switch to create a rising edge in the output of the demodulator;
- and
- detecting the rising edge at the edge detector.
Dependencies are inferred from the claim text.