FM Radio

FM Radio

1. Radio J.Janardhan

2. WHAT IS FREQUENCY Frequency is the rate at which occurs over a particular time The rate per second of a vibration constituting a wave ‘ A’ note on a violin string vibrates at about 440 Hz (440 vibrations per second ) It is measured in the hertz unit The hertz abbreviated Hz

3. AMPLITUDE MODULATION (AM) It is a form of modulation used for radio transmission It has the two way radio communication applications The basic concept is quite straight forward The AM signal is changed in line with the instantaneous intensity of the sound. Signal carries the sound or modulation. So that Radio frequency signal is the representation of the sound wave

4. BIRTH OF PRINT MEDIA

5. ADVANTAGES OF AM It is simple to implement It can be demodulated using a circuit consisting of very few components AM receivers are very cheap No specialised components are needed

6. DISADVANTAGES OF AM AM is a very basic form of modulation Simplicity is one of its major disadvantage It is not efficient in terms of its power usage It is not efficient in terms of the its use of bandwidth It is prone to high levels of noise

7. FREQUENCY MODULATIONS (FM) FM-When the frequency of carrier wave is changed with the intensity of the signal

8. ADVANTAGES OF FM It is resilience to signal level variations The signals does not fall to a level where the receiver cannot cope. FM is ideal for mobile radio communication FM is used for high quality broadcast transmissions FM is widely used in many areas of radio technology including broadcasting Specially in two way radio communication.

9. DIFFERENCE B/W AM AND FM

10. DIGITAL AUDIO BROADCAST DAB-is also known as digital radio and high definition radio Analog audio is converted into a digital signal Transmitted the signals on assign channel in the AM or FM DAB offers FM quality audio on the AM broadband In 1995, DAB technology was first developed UK It became common in entire Europe DAB is has better sound quality and new radio system DAB receivers includes a small display That provides information about the audio and visual

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