The present invention provides a structure in which an amplitude-modulation mode and a frequency-modulation mode are switched. A semiconductor device of the invention has: a reset control circuit to which a modulation mode select signal which selects an amplitude-modulation mode or a frequency-modulation mode and Manchester-encoded information are input, which outputs a first reset signal and a second reset signal; a first frequency-dividing circuit to which a carrier wave is input, which outputs a sub-carrier wave responding to the amplitude-modulation mode or a frequency-modulation signal responding to the frequency-modulation mode, according to the first reset signal; a second frequency-dividing circuit which outputs a basic clock of which a duty ratio is different between the amplitude-modulation mode and the frequency-modulation mode, according to the second reset signal and an output of the first frequency-dividing circuit; and an ASK/FSK switching portion to which an output from the first frequency-dividing circuit and Manchester-encoded information are input, which outputs an amplitude-modulation signal or a frequency-modulation signal according to the modulation mode select signal.

Semiconductor device and wireless communication system

The invention relates to a method of dynamic nuclear polarisation (DNP) using a combination of a trityl radical and a paramagnetic metal ion as the polarising agent leading to enhanced levels of polarisation in the sample to be polarised and to compositions and polarising agents for use in the method.

Method of Dynamic Nuclear Polarisation DNP

A vehicle rear door control system and method of controlling a vehicle rear door, such as a hatch or trunk is provided. The method detects the opening of a side door of a vehicle and senses with a plurality of proximity sensors movement of an object such as a driver or passenger of the vehicle exiting the vehicle and moving from a side to a rear of the vehicle. The method controls an actuator to open the rear door of the vehicle in response to the detected opening of the side door followed by the sensed movement of the driver or passenger from the side to the rear of the vehicle.

Method and system for controlling vehicle rear door

A receiver is utilized to receive signals from various systems within a vehicle such as tire pressure monitoring system (TPM) and a remote keyless entry system (RKE). During the on time, the receiver sequentially is open to receive a first signal with a first baud rate. If the signal of the first baud rate is not received, the receiver receives a second signal at a second baud rate. Upon receipt of a transmission, the receiver operates according to a mode that corresponds to the transmission indicated by the specific baud rate. The operation of the receiver can include specialized filtering, or other known signal processing that is tailored to the specific transmission data communication requirements.

Signal recognition for combined receiver for remote keyless entry and tire pressure monitoring systems

A demodulation circuit, a digital microwave system including the demodulation circuit, and a signal demodulation method are provided. The demodulation circuit includes a first circuit, a second circuit, a third circuit, and a fourth circuit connected in turn. The fourth circuit includes a pulse counting unit and a data decision unit connected in turn. The signal demodulation method includes: performing bandpass filtering on input signals; increasing gains of the bandpass filtered signals; extracting pulse signals are extracted from the gain-increased signals; counting the extracted pulse signals; filtering the pulse signals having counting values falling outside of a predetermined range, and outputting the filtered pulse signals.

Demodulation circuit, digital microwave system and demodulation method

A signal detection and discrimination system discriminates between FSK modulated signals and ASK modulated signals and switches a signal receiver mode to accommodate the signal type. A first discrimination stage counts the number of pulses in the signal over a selected time window. If the number of pulses within the time window fall within a valid range, it indicates that the signal is ASK modulated and that there is possible incoming data on the signal. If the number of pulses falls outside the valid range, the pulses are considered noise or data at a different baud rate. If the data signal exhibits no pulses within the time window, it indicates that the data signal is FSK modulated and the receiver is switched from an ASK mode to an FSK mode.

Radio frequency signal discrimination method and system

A passive entry and start system transmits a neutral signal over all the antennas except for that antenna that is proximate an area in which transmission to an identification device is desired. Accordingly, the area of a vehicle and those physical features that are proximate and associated with the area is isolated to prevent undesired operation of other vehicle mechanisms.

Cross conduction protection on antennas

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Radio frequency signal discrimination method and system

Cross conduction protection on antennas