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Input Devices (Microphones (used for (voice over in a presentation, speech…
Input Devices
Microphones
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voice recognition
users voice is detected and converted to digital. once spoken the words produce a digital wave pattern
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Speech recognition
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The spoken words are recognised and shown on a screen or inputted into a word processor, But the software doesn’t try and recognise the person talking
Keyboard
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A large part of the circuitry system is a grid of circuits beneath the key, called the key matrix
Each circuit is broken at a point below each key. When a key is pressed it presses a switch that completes the circuit allowing a small amount of current to flow though
When the processor finds a circuit that is closed, it compares the location of that circuit on the key matrix to the character map in its read-only memory
Every time a character is pressed it is converted into a digital signal, which the computer then interprets
Barcodes and scanners
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barcode scanners will emit a beep sound once barcode has been scanned and confirmed as correct by checking the check digit
consists of 3 parts - illumination system, the sensor, and the decoder
how it works
1 The illumination system illuminates the barcode using a red laser so that it can be scanned and read.
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3 the decoder interprets that signal, validates it using the check-digit, and coverts it so the computer can read it
as the laser or LED light is scanned across the barcode a pattern is generated which is converted into digital data.
Interactive whiteboards
Interactive whiteboard are devices that allow computer images to be displayed on a whiteboard using a digital projector.
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Mouse
1.An LED at the back generates red light and shines it horizontally, from the back of the mouse toward the front (from the left to the right of this photo).
2.A plastic light guide channels the light from the LED at an angle, down onto the desk.
3.A light-detector chip measures light reflected back up from the desk, converting the movements of your hand into digital signals that can be sent to your computer.
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