Electronic whiteboard, display equipment, adaptive transmitted power regulation method and system for electronic whiteboard and display equipment

Abstract

The invention discloses an adaptive transmitted power regulation method and an adaptive transmitted power regulation system applied to an infrared electronic whiteboard and display equipment. The method comprises the following steps of: transmitting a signal based on a transmitted power level stored in a memory; sampling the received signal; analyzing the sampled signal and current transmitted power; selecting subsequent transmitted power from a plurality of transmitted power levels based on analysis results of the sampled signal and the current transmitted power; and storing the selected subsequent transmitted power for updating the transmitted power level stored in the memory, and controlling a transmission module to transmit signals based on the updated transmitted power level in a subsequent scanning period. By the technical scheme provided by the invention, the shortcoming of received signal intensity instability caused by the optical power discreteness of an infrared transmitting tube can be effectively overcome; transmitter current can be reduced, and the service life of the infrared transmitting tube can be prolonged; moreover, the regulation requirements of transmitted power attenuation caused by the angle of the transmitting tube are reduced, and an improvement on production efficiency is facilitated.

Description

technical field [0001] The invention relates to a touch input device that should be on the surface of a display screen, in particular to a power self-adaptive adjustment method and system used in an infrared electronic whiteboard. Background technique [0002] The infrared writing electronic whiteboard relies on the sequential scanning of the infrared emitting tube matrix to work. The transmitting power determines the strength of the received signal. Due to the poor consistency of the electrical characteristics of the infrared emitting tube and the analog circuit of each channel, there is a large dispersion. If The use of the same transmission power standard will cause the strength of the received signal of each channel to be uneven. Therefore, the use of each infrared tube must adjust the emission angle of the infrared tube, and sometimes even replace the infrared tube, which increases costs and wastes time. It will cause great trouble and affect the stability of the produc...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an infrared writing electronic whiteboard or infrared writing screen in the prior art to balance the power of the received signal by adjusting the gain of the receiving circuit, so that the circuit structure and algorithm are complicated and the cost is high. Adaptive Adjustment Method of Transmission Power Applied in Infrared Electronic Whiteboard

[0005] Another technical problem to be solved by the present invention is: aiming at the shortcomings of the prior art infrared writing electronic whiteboard or infrared writing screen by adjusting the gain of the receiving circuit to equalize the received signal power, so that the circuit structure and algorithm are complicated and the cost is high, providing A self-adaptive adjustment system for transmission power applied in infrared electronic whiteboard

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