Process of Transmitting Information

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Welcome to class! 

In today’s class, we will be talking about the process of transmitting information. Enjoy the class!

Process of Transmitting Information 

In 1894, the young Italian inventor Guglielmo Marconi began working on the idea of building a commercial wireless telegraphy system based on the use of Hertzian waves (radio waves). By August 1895, Marconi was field-testing his system but even with improvements, he was only able to transmit signals up to one-half mile. In 1897, he established a radio station on the Isle of Wight, England.

In summary, Radio is a means of transmitting information over a long distance; most especially rural areas have access to information transmitted over the radio. It is all about sending audio messages over a long distance using electromagnetic wave.

Television

Television is used to transmit both visual and audio messages to a large audience over a far distance. Electronic television was first successfully demonstrated in San Francisco on Sept, 7^th, 1927.

The system was designed by Philo Taylor Farnsworth, a 21year old inventor who had lived in a house without electricity until he was 14. While still in high school, Farnsworth had begun to conceive of a system that could be coded onto radio waves and then transformed back into a picture on a screen.

There was also a mechanical television system, which scanned images using a rotating disk with holes arranged in a spiral pattern, had been demonstrated by John Logie.

In summary, Farnsworth scanned images with a beam of electrons while John Logie developed a mechanical television. Television is audiovisual electronic used to transmit both the audio messages and images.

Radio

News and entertainment programmes are broadcasted on the radio. Radio can be used only for broadcasting the audio messages to a large audience. Radio is the technology of signalling and communicating using radio waves.  Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing and other applications.

In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object’s location.

In radio navigation systems such as GPS and VOR, a mobile receiver receives radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device.

General evaluation

1. How can Radio and Television be used as media of information transmission?
2. Differentiate between Radio and Television.

Reading assignment

Surfing the internet to know more on radio and Television,

HIIT @ Schools Data Processing for Senior Secondary Education, pg 23.

Weekend assignment

1. ………. is used to transmit audio messages.  A.  Radio   B.  Newspaper      C.  Television  D.  Typewriter
2. ……….. is used to transmit both audio and visual messages to the audience.      A.  Radio      B.  Newspaper        C.   Television   D.   Typewriter
3. The radio uses ………. to transmit its content.   A.  Air   B.  Electromagnetic wave      C.     Magnetism     D.  Hydro
4. The radio was invented by ……… A.   Blaize Pascal   B.  Guglielmo Marconi     C.   Joseph Jacquard       D.     John Logie
5. One of the inventors of Television is …… A.  Famsworth  B.  G. Marconi   C.  Blaize Pascal      D.  None of the above

Theory

1. List any other THREE examples of modern information transmission.
2. Mention Four ancient methods of information transmission.

 

In our next class, we will be talking about Medium of Information Transmission.  We hope you enjoyed the class.

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