Infrared transmitter
AssigneeKabushiki Kaisha Audio-Technica
InventorTatsuji Harima
Life of this patent
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Abstract
An infrared transmitter is obtained that transmits a signal by changing a luminance of an infrared emitting LED, the infrared transmitter including: a transmission signal generating unit; a biasing voltage generating unit that generates a biasing voltage according to a magnitude of a transmission signal; a signal/voltage mixing unit that mixes the transmission signal and the biasing voltage; and a voltage-current conversion unit that converts a voltage into a current, in which the LED is driven by the current obtained by the conversion in the voltage-current conversion unit, so that power consumption efficiency can be improved.
Claims3
An infrared transmitter that transmits an optical transmission signal through changing a luminance of an infrared emitting LED, the infrared transmitter comprising:
- a transmission signal generating unit that generates an electrical transmission signal;
- a switching unit that changes a number of channels in the electrical transmission signal, wherein the number of channels is greater than or equal to two;
- a biasing voltage generating unit that generates a stepwise biasing voltage according to the number of channels of the electrical transmission signal that are changed by the switching unit;
- a signal/voltage mixing unit that mixes the electrical transmission signal and the stepwise biasing voltage;
- and
- a voltage-current conversion unit that converts the mixed electrical transmission signal and the stepwise biasing voltage into a current,
- wherein the infrared emitting LED is driven with the current obtained by conversion in the voltage-current conversion unit, and
- wherein the infrared emitting LED is a single infrared emitting LED.
Dependencies are inferred from the claim text.