| In 'History of the Computer - the
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| | use a modulation system, where the
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| emergence of Electronics', we saw how the
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| | amplitude, or strength, of the modulation
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| development of Radar during the second
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| | is proportional, or analogous, to the
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| world war led to an understanding of
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| | loudness of the original live singing or
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| pulse technology. At the same time
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| | playing. This music had been converted by
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| methods were refined for the calculations
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| | a microphone into an variable electrical
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| required for the ballistic trajectories.
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| | signal, analogous to the sound.With the
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| From these beginnings, the digital
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| | invention in the 1980s of the Compact
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| computer was developed.What is meant by
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| | Disc, digital techniques were employed to
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| 'Analog' and 'Digital'? A couple of
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| | represent the changes in sound levels, by
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| examples will explain the difference. An
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| | using a sampling pulse to monitor the
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| analog is something which is analogous,
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| | loudness of the sound. This sampling
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| obviously, but you may know that an
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| | pulse is used at a high frequency, so
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| analogous process or function is one that
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| | that it is not audible, and traces the
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| is equivalent, or very similar to another
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| | progress of the sound. The principle is
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| one. An analogy is often used to
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| | analogous to the movie camera where a
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| explain, or to assist the understanding
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| | sequence of still pictures are shown at a
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| of, some new feature in terms that are
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| | rate of 32 frames per second, so that
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| understood.For example a home electric
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| | they appear to show a moving picture.
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| circuit for house wiring to operate a
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| | Similarly a tv uses a frame rate of 50 or
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| lamp. The supply is controlled by a
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| | 60 per second (strictly speaking 25 0r 30
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| circuit breaker, when it is available at
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| | interlaced).The big advantage of a
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| the outlet where the lamp is plugged.
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| | digital recording and reproduction system
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| This can be compared to plumbing, where
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| | (amplifiers etc are also digital) is
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| the water supply is controlled by a valve
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| | that, due to the nature of the high
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| or tap on entering the home, then pipes
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| | frequency pulses, it is possible to copy
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| carry the water to the kitchen, where the
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| | them exactly when transferring from one
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| supply can be turned on or off by a tap
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| | medium to another, for example copying a
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| or faucet, and is immediately available.
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| | from cd track to compilation cd. With an
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| The rate of flow of the water can be
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| | analogue system there are losses in every
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| controlled, which is analogous to a
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| | transfer, so that a recording on a
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| dimmer on the lamp.The analogy is not
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| | cassette tape copied from a vinyl lp via
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| absolutely the same, but aids in the
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| | a home stereo is noticeably poorer
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| understanding of the electricity supply
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| | quality than the original.A computer can
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| by someone who knows the plumbing
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| | also be analog or digital, though the
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| system.Digital, concerning digits or
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| | digital type have vastly outgrown the
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| numbers, refers to the use of numbers to
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| | analog. An analog computer might be used
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| represent all things. As an example, a
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| | in research work, where, for instance a
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| digital watch uses numbers to indicate
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| | record may be made on a moving chart of
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| the time. The numbers on the face of
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| | the temperature and humidity in a room
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| traditional watch are distributed around
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| | being air conditioned by a new design air
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| the dial, so that the hands pointing to
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| | conditioner, the chart could also be a
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| them are analogous to the passage of
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| | display on screen. Either way, the graph
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| time. For example the minute hand
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| | is an analog representation of the
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| pointing straight down, half way through
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| | temperature and pressure.Early electronic
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| the circle of the clock, represents the
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| | controls in aircraft were run by a form
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| passing of half an hour. If the hour
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| | of analog computer, the amount the
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| hand is pointing to the number 3, this
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| | ailerons moved was proportional to the
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| indicates 3 hours of the 12 for a
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| | movement of the joystick, but not
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| complete circuit. When we learnt to tell
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| | directly proportional. A calculation was
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| the time we knew that this was half past
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| | performed, which depended on the speed
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| three. The digital watch however says
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| | and height of the aircraft, and other
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| 3:30.Closer to our topic, we can consider
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| | factors. The electronic 'boxes' involved
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| the evolution of the gramophone record.
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| | linear amplifiers and variable response
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| The vinyl LP was the standard medium for
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| | circuits, all fed by sensors from the
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| music recording and playing from the
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| | flight controls etc.Tony is an
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| 1950s, tape recordings were also
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| | experienced computer engineer.
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| developed in parallel. Both these media
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