PHOTOVOLTAIC RECEIVER OPTIMISED FOR COMMUNICATION BY CODED LIGHT
First Claim
1. A communication device for communication by coded light in which the communication has an initial signal-to-noise ratio, denoted SNR1, that is variable depending on the illumination conditions, the communication device comprising at least one light receiver of photoreceptor type including an anode and a cathode and having an initial shunt resistance with a value Rsh1, the receiver being liable to be exposed simultaneously to a source of coded light carrying a signal and to a source of uncoded light,wherein said anode and cathode are short-circuited by at least one short-circuit resistor Rp arranged inside the photoreceptor, with a value Rsh2 chosen such that the new value of the shunt resistance of said photoreceptor, denoted Rsh3 and resulting from the connection of the initial shunt resistance Rsh1 and of the short-circuit resistor Rp, gives the communication device a new resultant signal-to-noise ratio SNR2 that remains substantially independent of the intensity of said uncoded light.
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Accused Products
Abstract
A coded-light communication device is described, in which the communication has an initial signal-to-noise ratio, which varies according to the lighting conditions. The device comprises at least one photodetector-type light receiver comprising an anode and a cathode and having an initial shunt resistance. The receiver is capable of being simultaneously exposed to a coded light source carrying a signal and a non-coded light source. The anode and cathode are short-circuited by at least one short-circuit resistance arranged inside the photodetector, having a value selected so that the new value of the shunt resistance of the photodetector resulting from the connection of the initial shunt resistance and the short-circuit resistance gives the communication device a new resultant signal-to-noise ratio which remains substantially independent of the intensity of the non-coded light.
1 Citation
16 Claims
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1. A communication device for communication by coded light in which the communication has an initial signal-to-noise ratio, denoted SNR1, that is variable depending on the illumination conditions, the communication device comprising at least one light receiver of photoreceptor type including an anode and a cathode and having an initial shunt resistance with a value Rsh1, the receiver being liable to be exposed simultaneously to a source of coded light carrying a signal and to a source of uncoded light,
wherein said anode and cathode are short-circuited by at least one short-circuit resistor Rp arranged inside the photoreceptor, with a value Rsh2 chosen such that the new value of the shunt resistance of said photoreceptor, denoted Rsh3 and resulting from the connection of the initial shunt resistance Rsh1 and of the short-circuit resistor Rp, gives the communication device a new resultant signal-to-noise ratio SNR2 that remains substantially independent of the intensity of said uncoded light.
Specification