Radio Stations Within The Uk

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Introduction Radio Stations within the UK are listened to frequently by large audiences throughout the country. This is achieved through the use of a number of different network media platforms either in Analogue or Digital form; including the Internet and traditional wired and wireless broadcasting such as AM/ FM networks. The objective of this report is to choose two examples of a broadcast radio platform – one being digital with the other being analogue and then describe in detail of the modulation methods employed in each case. The 2 broadcast radio platforms that will be focused on in this report will be AM/ FM and Digital Radio (DAB); providing background information on each technology and specify modulation methods used by each in…show more content…
Once the signal is received, these receivers will demodulate the signal – meaning to extract the modulation from the received signal. AM AM (Amplitude Modulation) is the original way of broadcasting radio. Lee de Forest and Reginald Fessenden are given credit for the development of the technique which was carried out successfully for the first time in the mid-1870s, its frequency ranges from 535 to 1705 KHz and the typical bandwidth of an AM channel is 10 kHz. The name ‘AM’ itself gives a clear indication to the type of modulation technique used; Amplitude Modulation. Amplitude Modulation is a modulation technique which works is by modifying the carrier wave’s strength by increasing or decreasing its peaks in line with the variations of the input sound; the strength of the wave is known as amplitude, through all of this the frequency remains constant – the same. This type of modulation technique is more susceptible to noise and or interference due to the fact noise effects amplitude directly. The change in signal strength allows the conveyance of information through the radio wave that is sent out via a transmitter and is received by a radio device otherwise known as the receiver. When the signal is received, demodulation takes place; this can be dealt with in two ways depending on the device. Either a Diode AM detector will carry out the demodulation (which is
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