Infrared electronic password. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Infrared "electronic password". Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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Regardless of the nature of the radiation, whether it be a radio wave, ultrasound or light, special attention is paid to the signal itself in devices for automatic identification of "one's own". The main requirement for it is that the probability of the appearance of exactly the same signal from an extraneous source must be negligible.

In modern technology, a code message usually has the form of a binary sequence, for example, 1001101000111..., where one corresponds to the presence of radiation, and zero corresponds to a pause of "pure" ether or some other radiation. If n is the number of bits (familiarity) in such a signal, then placing ones and zeros in different ways, we can get 2 "different combinations of them. So with n \u7d 128 there are 15 of them, with n \u32768d 23-8388608, and with n \uXNUMXd XNUMX - XNUMX.

Among the many possible, one particular binary sequence is singled out especially - as a code, an electronic password.

Publication: cxem.net

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