APPARATUS FOR TRANSMITTING AND RECEIVING A SIGNAL IN A VISIBLE LIGHT COMMUNICATION SYSTEM
First Claim
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1. An apparatus for transmitting a signal in visible light communication, comprising:
- a light-emitting element configured to emit visible light;
a drive signal module configured to generate modulated signals of different types from a signal to transmit, thereby to generate a drive signal from one of the modulated signals; and
a drive module configured to drive the light-emitting element in accordance with the drive signal.
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Abstract
Disclosed herein is a visible light communication system, in which the visible light emitted from the light-emitting element is superposed with a signal in order to accomplish communication. The system has a transmitter and a receiver. The transmitter has a modulation circuit whose the demodulating mode can be changed during the communication in accordance with the state of the visible light. The receiver receives the visible light emitted from the transmitter and has a demodulation circuit that demodulates the modulated signal received from the transmitter.
25 Citations
12 Claims
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1. An apparatus for transmitting a signal in visible light communication, comprising:
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a light-emitting element configured to emit visible light; a drive signal module configured to generate modulated signals of different types from a signal to transmit, thereby to generate a drive signal from one of the modulated signals; and a drive module configured to drive the light-emitting element in accordance with the drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for receiving a signal in visible light communication, comprises:
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a light-receiving element configured to receive visible light; a received optical-signal processing module configured to extract, as a received signal, a signal superposed on the visible light received by the light-receiving element; a converting module configured to convert the received signal to a modulated signal of the signal to transmit; and a demodulation module configured to demodulate the modulated signal to the signal to transmit. - View Dependent Claims (9, 10, 11)
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12. An apparatus for receiving a signal in visible light communication, comprising:
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a light-receiving element configured to receive visible light; a received optical-signal processing module configured to extract, as a received optical signal, a signal to transmit superposed on the visible light received by the light-receiving element; and a demodulation module configured to demodulate the signal to transmit, in accordance with a trailing edge of the received optical signal.
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Specification