The first patent of FM radio was acquired by Edwin H. Armstrong. FM radio modulates the frequency of audio program to decrease the amount of stillness and interference from atmosphere and electronic equipment. The Federal Communication Commission of US granted the permission of construction of first FM radio station in the year 1937. In India, FM broadcasting started in Madras on 23 July 1937 and its expansion took place in the year 1990. According to the list Prepared by Wikipedia in, March 2010, the total number of FM stations in India was 171. The maximum number of radio stations is located in Chennai and there number is 14.
Features of FM Broadcasting Technology
In radio broadcasting, the sound waves are turned into electromagnetic waves by a microphone. These electromagnetic waves are received by the receiving aerial and transferred to a loudspeaker after this. The loudspeaker turns the waves back into the sound waves.
This process is followed in two ways: Frequency Modulation and Amplitude Modulation. Modulation is a method through which information to be carried is put on radio wave. The key objective of FM broadcasting is to bring improvement in the quality of broadcasting. The key features of frequency modulation are given below:
• Frequency Modulation transfers information through a carrier wave by changing its frequency while in AM technology, the frequency stays constant but amplitude of transporter is changed.
• The band width requirement for FM transmission is 180 khz.
• FM Radio Signals can be transmitted to an area of 50 to 60 km.
• The technique of frequency modulation is used for Very High Frequency Broadcasts.
• The FM broadcasting has gained momentum as it offers high sound quality signals which are free from disturbance and interference to listeners.
• FM broadcasting decreases the burden on bands with medium, low and high frequency.
• FM Broadcasting is beneficial for developing countries with tropical areas that are affected from solar interference.
• In FM broadcasting, several channels can be operated through a signal band as it does operate beyond a fixed area.
• One very important feature of FM broadcasting is that the sound and broadcast quality remains the same during day and night and its quality does not get disturbed by atmospheric conditions.
• Radio data service and radio paging service can also be availed through FM technology.
Submitted by: Sudhaamit Saraswat
Features of FM Broadcasting Technology
In radio broadcasting, the sound waves are turned into electromagnetic waves by a microphone. These electromagnetic waves are received by the receiving aerial and transferred to a loudspeaker after this. The loudspeaker turns the waves back into the sound waves.
This process is followed in two ways: Frequency Modulation and Amplitude Modulation. Modulation is a method through which information to be carried is put on radio wave. The key objective of FM broadcasting is to bring improvement in the quality of broadcasting. The key features of frequency modulation are given below:
• Frequency Modulation transfers information through a carrier wave by changing its frequency while in AM technology, the frequency stays constant but amplitude of transporter is changed.
• The band width requirement for FM transmission is 180 khz.
• FM Radio Signals can be transmitted to an area of 50 to 60 km.
• The technique of frequency modulation is used for Very High Frequency Broadcasts.
• The FM broadcasting has gained momentum as it offers high sound quality signals which are free from disturbance and interference to listeners.
• FM broadcasting decreases the burden on bands with medium, low and high frequency.
• FM Broadcasting is beneficial for developing countries with tropical areas that are affected from solar interference.
• In FM broadcasting, several channels can be operated through a signal band as it does operate beyond a fixed area.
• One very important feature of FM broadcasting is that the sound and broadcast quality remains the same during day and night and its quality does not get disturbed by atmospheric conditions.
• Radio data service and radio paging service can also be availed through FM technology.
Submitted by: Sudhaamit Saraswat
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