METHOD AND DEVICE FOR OPTICALLY TRANSMITTING DATA
First Claim
1. A method for optically transmitting data by means of a pulse-width-modulated light source, comprising:
- specifying a pulse duty factor of a pulse width modulation to set the brightness of the light source as a ratio between a blanking time of the light source and a period of a pulse width modulation cycle, wherein a difference between the period and the blanking time corresponds to a bright-up time of the light source within one pulse width modulation cycle, andwith at least one blanking, dividing the bright-up time into at least one first and second partial bright-up time so that the data to be transmitted is encoded by means of the start and time period of the at least one respective blanking,wherein the sum of the partial bright-up times within the pulse width modulation cycle essentially corresponds to the bright-up time according to the specified pulse duty factor.
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Accused Products
Abstract
In a method for optically transmitting data by means of a pulse-width-modulated light source (LED), a pulse duty factor (N) of a pulse width modulation is specified to set the brightness of the light source (LED). A bright time (T) is divided into at least a first and second partial bright time using at least one blanking so that the data (DATA) to be transmitted are encoded by the start and time length of the at least one blanking. The sum of the partial bright times within the pulse width modulation cycle substantially corresponds to the bright time according to the specified pulse duty factor.
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Citations
18 Claims
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1. A method for optically transmitting data by means of a pulse-width-modulated light source, comprising:
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specifying a pulse duty factor of a pulse width modulation to set the brightness of the light source as a ratio between a blanking time of the light source and a period of a pulse width modulation cycle, wherein a difference between the period and the blanking time corresponds to a bright-up time of the light source within one pulse width modulation cycle, and with at least one blanking, dividing the bright-up time into at least one first and second partial bright-up time so that the data to be transmitted is encoded by means of the start and time period of the at least one respective blanking, wherein the sum of the partial bright-up times within the pulse width modulation cycle essentially corresponds to the bright-up time according to the specified pulse duty factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for optically transmitting data by means of a pulse-width-modulated light source comprising:
- a data modulation module for receiving data to be transmitted and a settable pulse duty factor of a pulse width modulation as a ratio between a blanking time of the light source and a period of a pulse width modulation cycle, wherein a difference between the period and a blanking time corresponds to a bright-up time of the light source within one pulse width modulation cycle;
wherein, the data modulation module is set up for the definition of at least one blanking by which the bright-up time is divided into at least one first and second partial bright-up time, so that the data to be transmitted is encoded by means of at least one of the start and time period of the at least one respective blanking, so that the sum of the partial bright-up times within the pulse width modulation cycle essentially corresponds to the bright-up time according to the specified pulse duty factor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- a data modulation module for receiving data to be transmitted and a settable pulse duty factor of a pulse width modulation as a ratio between a blanking time of the light source and a period of a pulse width modulation cycle, wherein a difference between the period and a blanking time corresponds to a bright-up time of the light source within one pulse width modulation cycle;
Specification