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Supersonic digital code remote control method

A digital encoding and ultrasonic technology, applied in signal transmission systems, instruments, non-electrical signal transmission systems, etc., can solve problems such as signal distortion, low amount of remote control information, and delayed reflection signals

Inactive Publication Date: 2003-11-26
上海仪电数字技术股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above two methods are poor anti-interference, low amount of remote control information, generally only 3-way remote control
[0003] At present, the ultrasonic remote control cannot use digital coding, the reason is that the ultrasonic pulse will be reflected during the transmission process, because the ultrasonic transmission speed is low, and the reflected signal is delayed relative to the direct signal
The reflected signal and the direct signal are superimposed, causing interference. After demodulation at the receiving end, the signal is severely distorted and cannot be decoded

Method used

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Embodiment Construction

[0037] The remote control signal that the present invention designs is as attached Image 6 , 7 As shown in , 8 and 9, PPM coding is adopted, the pulse time is 3mS, and the pulse is modulated by 40kHz ultrasonic waves, especially to extend the gap between pulses. During this gap time, the reflected signal will attenuate. When the intensity of the direct signal is lower than 6dB, the reflected signal can be filtered out, and the pulse gap time used is 20mS and 29mS.

[0038] The signal of the present invention is composed of a leading head, a 2-bit address code, a 4-bit signal code, and a 4-bit check code (the check code is the inverse of the data code).

[0039] Please refer to the attached Figure 4 Shown, the ultrasonic receiving amplifying circuit of the present invention is micropower consumption, low noise, high bandwidth gain and low cost, and the 40kHz ultrasonic signal that the ultrasonic transducer of receiver receives, minimum amplitude is 0.5mVpp, therefore, ampli...

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Abstract

The supersonic remote controller is for producing supersonic digital code remote control signal. The remote control signal is PPM digital coded and 40 KHz supersonic wave modulated and has pulse width of 2-4 ms and pulse interval greater than 15-35 ms. The coded signal has the order of guide head, 2-bit address code, 4-bit signal code, 4-bit address code and 4-bit check code. The supersonic remote controller has emitter, receiver and monochip microprocessor with interference suppressing software for suppressing the interference of emitted supersonic wave. The present invention has the advantages of powerful anti-jamming capacity and great remote control capacity.

Description

technical field [0001] The invention relates to the use of ultrasonic digitally coded remote control signals, and designs an ultrasonic remote control transmitting device and receiving device. Background technique [0002] Most of the existing ultrasonic remote control methods use frequency coding or pulse coding. Frequency coding is to use several frequencies (up to 3) within the bandwidth of the ultrasonic sensor to code, and pulse coding is to use ultrasonic waves to modulate low-frequency pulses. The disadvantages of the above two methods are poor anti-interference, low amount of remote control information, and generally only 3-way remote control. [0003] At present, the ultrasonic remote control cannot use digital coding, because the ultrasonic pulse will be reflected during the transmission process, because the ultrasonic transmission speed is low, and the reflected signal is delayed relative to the direct signal. The reflected signal and the direct signal are superi...

Claims

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Application Information

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IPC IPC(8): G08C23/00
Inventor 陶力程以凡张毅
Owner 上海仪电数字技术股份有限公司
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