Walkie-talkie technology was first produced in paranoia Twenties, Westinghouse was born in the laboratory. A man named John Kermode eccentric inventor "wishful thinking" to want to achieve automatic sorting postal documents, when each envisaged application of electronic technology have made people feel very strange. His idea is to make marks on the envelope talkie, walkie-talkie The information in the recipient's address, as today's postal code. To this end Kermode invented the first walkie-talkie logo, the design is very simple, that is, a "strip" means the number "1", two "bars" showing the number "2", inferior race, and so on. Then he invented the walkie-talkie from the basic elements of reading equipment consisting of: a (capable of emitting light and receiving the reflected light) reflected signal bars and spaces of the method for determining that edge positioning coil; and a method using the measurement results, namely translation decoder.
Kermode use the new invention was light battery to collect the reflected light. "Empty" reflected back is a strong signal, "Article" reflected back is a weak signal. Electronic components and high-speed applications today is different, Kermode measured using a magnetic coil to "Article" and "empty." Like a child the wire connected to the battery and then wound up in a nail jam. Kermode with a tape core coil receives the "empty" signal when attracting a switch, receiving the "bar" signal when the release switch and the circuit. Thus, the first walkie-talkie reader noisy. By a series of relay control switch "on" and "off" by the printing "bar" in the number of decisions on the envelope. In this way, walkie-talkies were symbols directly on the letter sorting.
Shortly thereafter, Kermode collaborators Douglas Young, on the basis of Kermode code made some improvements. Kermode code information contained quite low and it is difficult to compile more than ten different codes. The Young code bars the use of fewer, but the use of the space between the dimensional change, as today's walkie-talkie UPC symbol using four different bar-space dimensions. The new walkie-talkie symbol in the same space of a hundred different coding regions, and the Kermode code can only encode ten different areas.
Intercom Exterior Collection (20) according to full-talkie symbol until 1949 patent literature first time with Norm Woodland and Bernard Silver invention, before the patent literature has not recorded walkie-talkie technology, nor put into practical application of precedent. Norm Woodland and Bemard Silver idea is to use Kermode and YOung vertical "bar" and "empty", and make it bend into a ring, much like archery target. Thus through the center of the scan pattern, capable of walkie-talkie symbol decoding, regardless of walkie-talkie symbol toward the direction.
In its use of the patented technology in the process of continuous improvement, a science fiction writer Isaac-Azimov in his "naked sun," a book about the new method uses information encoded realize automatic recognition of cases. At that time people think this book intercom symbol looks like a checkerboard lattice, but today's walkie-talkie professionals will immediately realize that this is a two-dimensional matrix intercom symbol. Although this walkie-talkie symbol no direction, positioning and timing, but it is clear that it is represented by a high density of digitally encoded information.
Until after the 1970 Iterface Mechanisms company developed a "two-dimensional code", only the price of the two-dimensional matrix intercom salable printing and reading equipment. At that time two-dimensional matrix intercom for automated newspaper publishing process. Two-dimensional matrix intercom printed on the tape by today's one-dimensional CCD scanner reading. CCD light emitted in the tape, each photocell aligned with different areas of the tape. Each photovoltaic cell according to the tape printing walkie-talkie or not output a different pattern, combined to produce a high density information pattern. This method can be used in the space of the same size print on a single character, as a single bar code among the early Kermode. Timing information is also included, so the whole process is reasonable. When the first system to enter the market, including a full set of equipment, including printing and reading equipment to be approximately $ 5,000.
Shortly thereafter, as the LED (light emitting diode), the development of the microprocessor and the laser diode, ushered in a new symbol for (symbology) and its application in the Big Bang, known as the "walkie-talkie industry." Today, few can find no direct contact with the walkie-talkie that is fast and accurate technology companies or individuals. Due to technological progress and developments in this area very quickly, and every day more and more applications are developed, it will not be long before the intercom as popular as light bulbs and transistor radios, we will make the lives of everyone It has become easier and more convenient.
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