Communications device

Details Communications device Communications device

1996-04-23

1999-01-26

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375355, H04L 2714, H04L 2716

Patent

active

058645888

ABSTRACT:
A communications device, such as a non-contact IC card, demodulates a received carrier signal, which has been modulated with data to be transmitted thereto by changing the phase of the carrier signal intermittently according to the data, so as to extract the data from the carrier signal. The communications device includes a clock generating circuit for generating a clock signal from the carrier signal received, a demodulating circuit for demodulating the carrier signal received so that it extracts the data from the carrier signal and outputs the data, and for, when the phase of the carrier signal is varied, outputting a signal indicating a change in the phase of the carrier signal, a baud rate generator for resetting a frequency dividing process to restart the process of dividing the frequency of the clock signal from its initial state to generate a sampling signal when receiving the signal indicating a change in the phase of the carrier signal from the demodulating circuit, and a shift register for performing a sampling process on the data delivered by the demodulating circuit in accordance with the sampling signal.

REFERENCES:
patent: 5259000 (1993-11-01), Kojima et al.

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