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Intercom development history

Category:Industry dynamic  Date:2013-12-05  Views:1830   [back]
Talkie technology first appeared in the twenty's jittery, born in Westinghouse's lab. A man named John Kermode eccentric inventor "indulge in the wildest fantasy" to the postal documents to realize the automatic sorting, then for every application of electronic technology makes people feel very strange. His idea is do mark on the envelope the walkie talkie, walkie talkie information is the address of the receiver, like today's postal code. Therefore Kermode invented the earliest talkies logo, design is very simple, that is a "strip" said the number "1", two "a" digital "2", and so on. Then, he also invented the radio reader device which is composed of basic elements: a (capable of emitting light and receives the reflected light) determination of reflected signals and empty methods, namely edge positioning coil; and the use of the results determined by the method of, namely the decoder.
Kermode to collect the reflected light by light battery when the new invention. "Empty" reflected signal is strong, "" reflected signal is weak. Electronic components application with the high speed is different, Kermode to determine the "strip" and "empty using magnetic coil". Like a child will wire is connected with the battery again around a nail up paper clip. Kermode uses a coil with an iron core to the "empty" signal at the receiving attract a switch, after receiving the "time" signal, the release switch and switch on the circuit. Therefore, the earliest talkies reader noise. The switch is controlled by a series of relay, "open" and "quantity" by the print on the envelope "strip" decision. By this method, the walkie talkie symbols directly to mail sorting.
Shortly thereafter, the partner of Kermode Douglas Young, based on Kermode codes have made some improvements. The amount of information contained in the Kermode code is quite low, and it is difficult to make a different code more than ten. But Young code use less, but the size of air strips, like today's UPC symbol using four different space dimensions. Walkie talkie new symbol can encode one hundred different areas in the same space, while the Kermode code can only encode ten different regions.
Walkie talkie appearance collection (20) patent literature until in 1949 was the first time we have a full range of Norm Woodland and Bernard Silver walkie talkie symbols of the invention in the patent literature records, before this has not walkie talkie technical records, also did not put into practical application of precedent. Norm Woodland and Bemard Silver idea is to use the Kermode and YOung vertical "strip" and "empty", which is bent into a ring, very much like archery target. By scanning the center of the figure, is capable of walkie talkie symbol decoding, regardless of the direction of the walkie talkie symbol.
In the process of continuous improvement in the use of the patented technology, a science fiction writer Isaac-Azimov about the new method uses the information encoded in his "Naked Sun" in one book to realize automatic recognition. When people feel the walkie talkie symbol in this book looks like a square lattice board, but today's walkie talkie professionals will soon realize that this is a two-dimensional matrix intercom symbol. Although this walkie talkie symbols without direction, positioning and timing, but apparently it represents the digital coding of high information density.
Until 1970, Iterface Mechanisms company developed the "code", only the price for the two-dimensional matrix walkie talkie sales of printing and reading device. Then the two-dimensional matrix intercom for automated newspaper publishing process. Two dimensional matrix intercom printed on paper tape, the one-dimensional CCD scanning reading today. CCD lights on the paper tape, different area of each cell at the tape. Each cell according to the tape printing walkie talkie different or not output patterns, combined to produce a high density information pattern. This method can be a single character in the print space the same size, as an early Kermode code in a single. The timing information is also included, so the whole process is reasonable. When the first system after entering the market, a full set of equipment including print and reading equipment, $5000.
Shortly thereafter, with the development of LED (light emitting diode), continuous development of the microprocessor and a laser diode, ushered in the new symbol (symbolic) big bang and its application, known as the "walkie talkie industry". Company or individual can rarely find no direct contact with quick and accurate radio technology today. With. With the development of technology in this field very quickly, and every day there are more and more applications are developed, soon will be like lighting and semiconductor radio interphone as popular, will make every one's life easier and more convenient.