Signal Processing

Download Analogue and Digital Communication Techniques by Grahame Smillie PDF

By Grahame Smillie

The speedy enlargement of electronic communications, really within the fields of television and cellular phones doesn't overide the necessity for a transparent knowing of analogue frequencies. furthermore, analogue expertise will play a huge function in communications good into the twenty first century.

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I 1 I 2 I 3 , ' i ! I ' LS. i ! ! 4 kHz . . . 3 kHz " ,i 4 ' ! I 5 6 , ...... S, 7 i i ,8 ' ! 7 kHz . . . 6 kHz us. 4 kHz . . 3 kHz ! | Line graph Fig. 2 Line graphs for double sideband transmission The lower sideband is determined by the following: LSB = Ifc-fa[ The modulus is taken so as to produce a positive result. At a demodulator the modulating frequency is sometimes higher than the carder frequency. To ensure that the answer is positive the modulus is taken as there are no negative frequencies.

7 kHz . . . 6 kHz us. 4 kHz . . 3 kHz ! | Line graph Fig. 2 Line graphs for double sideband transmission The lower sideband is determined by the following: LSB = Ifc-fa[ The modulus is taken so as to produce a positive result. At a demodulator the modulating frequency is sometimes higher than the carder frequency. To ensure that the answer is positive the modulus is taken as there are no negative frequencies. The frequency starts at just above 0 Hz and increases in a positive direction. 1 Determine the frequency of the lower sideband and upper sideband for an amplitude modulator where the carrier frequency is 8 kHz and the modulating frequency is 1 kHz.

The resultant baseband is from 312 kHz to 12 024 kHz. This band is now sent to the terminal equipment where it is amplified and then transmitted down the coaxial cable. A coaxial cable, such as that used to connect a TV aerial to a TV receiver, is made up of a thick cylindrical copper conductor in the centre which is surrounded by a copper sheath. e. insulation material placed around the inner conductor. This construction is sometimes referred to as a coaxial tube. 6 Major group carrier frequencies and output frequency bands Major group No.

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