Peripheral Assignment

The Speaker: The First Patent for a speaker was in 1877 by Ernst Siemens. Later thought in 1924 two researchers patented the newer version on the speaker witch included a moving coil and direct radiator. In 1926 these were sold to the consumers and called “Radiola”.
A speaker basically converts the electrical signal into physical vibrations. Sound waves are created by the rapidly vibrating the diaphragm which is basically a cone attached to the speaker. The diaphragm is attached to the voice coil. There are magnets by the poles of the voice coil and when music is played it goes through the amplifier which outputs either positive or negative electrical charges of different size and frequency’s in a pattern. Theses flow to the voice coil which then depending on what charge it attracted to one of the magnetic poles. This happens extremely fast so the diaphragm is moving back and forth creating sound. There are different types of drivers in speakers. Some basic ones are woofers, tweeters and midrange. Woofers are designed to produce low frequency sounds while tweeters produce higher frequencies and midranges in the middle.


Microphone: The First microphone, called a carbon microphone was invented by David Edward Hughes in 1878. This was actually made for Alexander Graham Bells telephone. Microphones were not sold by themselves at first they came with telephones and telephones were available to the public in the late eighteen hundreds.A microphone basically operates in the same way, when you speak into it your sound waves vibrate the diaphragm which vibrates the magnet inside the coil at the same frequency and your voice. The magnet moving creates and electrical current which travels to its output source such as a speaker which will play your voice exactly as it was recorded. The microphone is basically the opposite of a speaker

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In this assignment we had to research a external computer add on. How it works and its background information. We also had to draw a diagram and create a chart of places in which you could purchase the product and information about it.I did mine on the microphone and the speaker. I didn't like this project very much because i didn't feel it wasn't very fun. On the other hand it was very informative and i learned alot about Telus and other statistics that companies use to determine their profits. Drawing the speaker and the microphone was my favourite part of this project.