Speech Recognition Devices:
Speech recognition
devices are input
devices that allow a person to input data to a computer system by speaking
to it. Currently, speech recognition systems have limited success because
correct interpretation by a machine of the large number of words in the vocabulary
of a language is difficult. The major
difficulties are that people speak with different accents (pronounced differently) and intonations ( with the different tone or pitch of the voice), and
the fact that the meaning of words can
vary depending on the context in which they are used.
Some of its applications are:
1.
For
data input to a computer system by person in situations where his/her hands are
busy or eyes must be fixed on a measuring instrument or some other object. For
example, doctors in an operation room can request certain information about a
patient while operating.
2.
For
data input by dictation of long text or message for latter editing and review.
3.
For
authentication of a user by a computer system based on speech input.
In addition to making input of data easier, speech
recognition systems also provide freedom of movement to the operator because
the operator is free to stand up, move around, or do some other work by hand
while in putting a voice data to the system.
Vision Input System:
A vision input system
allows a computer to accept input by seeing an object. Input data in
this case is normally an object’s shape and features in the form of an image. The
idea is to simulate the capability of a human vision system in a limited sense.
A computer with a vision input device consists of a digital camera. Following steps are
taken to recognise a given object:
- The camera is focused on the
input object to take its picture.
- The camera creates an image of
the object in digital form so that it can be stored and interpreted by the
computer.
- The digitized image of the
object is matched against similarly formed pre-stored images in the computer’s
image database.
- Depending on whether a match is
found or not, the system takes an appropriate action.
Vision input devices are used mainly in factories for
designing industrial robots used for quality control and assembly processes.
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