Page 106 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes 15. ............................. wireless printing is a proprietary open wireless technology standard for
exchanging data over short distances from fixed and mobile devices.
16. ............................. printing is a cost-effective way to easily and flexibly produce barcodes
wherever you are.

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Case Study Wireless Microphone
wireless microphone is a microphone without a physical cable connecting it directly
to the sound recording or amplifying equipment with which it is associated. Also
A known as a radio microphone, it has a small, battery-powered radio transmitter
in the microphone body, which transmits the audio signal from the microphone by radio
waves to a nearby receiver unit, which recovers the audio. The other audio equipment
is connected to the receiver unit by cable. Wireless microphones are widely used in the
entertainment industry, television broadcasting, and public speaking to allow public
speakers, interviewers, performers, and entertainers to move about freely while using a
microphone to amplify their voices.
There are many different standards, frequencies and transmission technologies used to
replace the microphone's cable connection and make it into a wireless microphone. They
can transmit, for example, in radio waves using UHF or VHF frequencies, FM, AM, or
various digital modulation schemes. Some low cost (or specialist) models use infrared
light. Infrared microphones require a direct line of sight between the microphone and the
receiver, while costlier radio frequency models do not.

Some models operate on a single fixed frequency, but the more advanced models operate on
a user selectable frequency to avoid interference, and allow the use of several microphones
at the same time.
Advantages and disadvantages

Wireless microphones awaiting pickup by performers in a musical.
The advantages are:
z z Greater freedom of movement for the artist or speaker.
Contd...

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