The microphone is a word from the Greek word for micro and small important voice on the phone. It 'the first time in a dictionary in 1683 as a tool by which small sounds are intensified.
This was in relation to devices such as hearing aids ear trumpets and megaphones of that period. Microphones were introduced with the first joint-telephone transmitter developed almost simultaneously by Elisha Gray and Alexander Graham Bell. Then it was used as a liquidTransmitter, which was a variable resistance device. But the poor quality of this fluid channel led a number of inventors to seek alternative means of design.
Registered in the telephone business by the end of 1877 with two companies are developing that seek to improve stations, other experimenters began to appear and offer their own devices. David Edward Hughes was a man who has developed a new type of microphone, with carbon granules loosely packed in a closed reaction space.Inpressure changes other than a solid membrane, the electrical resistance proportional to the carbon granules.
Another important scientist Thomas Alva Edison refined the mic granules of carbon, which carbon-button transmitter in 1886. Edison transmitter was easy and inexpensive to produce, but also very effective and durable. It has been used for the base of the telephone exchanges in millions of phones around the world.
The next important step inDesign Hunnings transmitter was Henry of England. He used granules of coke between the diaphragm and a metal back plate. This project started in 1878 and patented 1879 This station was very efficient and can carry more power than its competitors. His only problem was that there was a tendency to pack and had to lose their sensitivity.
The advent of electric recording of the disc and the transmission at the beginning of 1920 promoted the development of carbon microphones of better quality.The year 1920 inaugurated the era of commercial broadcasting. Some of the most experienced and amateur singers began to play records and using microphones with their programs. The first radio station used the candlestick telephone for a microphone.
The transmitting element typical in this period was the Western Electric No. 323 beginning it was like talking with them, as they used to use a telephone. The next step was to determine the entertainer with a microphone that will allow them to stay and would. Perform for this application, the manufacturer has the transmitter of the candlestick phone, the mouthpiece soon replaced with the megaphone and put this combination in a felt-lined bakelite sleeve about eight inches long and make little loops at both ends to stop it from .
The first microphone, he has done for the film industry was the PB17. It 'been a sandblasted aluminum cylinder, 17 cm long and 6 cm in diameter. The fund was supplemented by a yoke to keep the tapeAn element that has a perforated shield. The magnetic structure used an electromagnet requires six volts to an amplifier.
In recent years some of the more radical approaches to design the model, including the microphone recording of the movement, in response to changes in sound pressure of charged particles, a similar system for the speaker ion. Miniature optical interfaces and similar devices developed for telecommunications, such as laser diodes in miniaturePolarization beam splitter and photodiodes help, now in the construction of high quality optical microphones.
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