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MODULATION TECHNIQUES Modulators

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II List of Contents V 0130<br />

5. Digital modulation techniques<br />

5.1 Theoretical introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107<br />

5.2 Generation of amplitude shift keying signals (ASK) . . . . . . . . . . . . . . . . . . . . . . . . . . 115<br />

5.3 Spectrum of amplitude shift keying signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119<br />

5.4 Generation of frequency shift keying signals (FSK) . . . . . . . . . . . . . . . . . . . . . . . . . . 129<br />

5.5 Spectrum of frequency shift keying signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131<br />

5.6 Generation of phase shift keying signals (PSK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133<br />

5.7 Spectrum of phase shift keying signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137<br />

6. Pulse modulation techniques<br />

6.1 Theoretical introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143<br />

6.2 Generation of a pulse amplitude modulated signal . . . . . . . . . . . . . . . . . . . . . . . . . . 145<br />

6.3 Frequency spectrum of the pulse amplitude modulated signal . . . . . . . . . . . . . . . . . . . 151<br />

6.4 Explanation of the sampling theorem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155<br />

6.5 Time-division multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159<br />

7. Pulse code modulation<br />

7.1 Theoretical introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165<br />

7.2 Experiments with pulse code modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169<br />

7.3 PCM multiplex generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173<br />

8. Delta modulation<br />

8.1 Theoretical introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177<br />

8.2 Generation of delta modulated signals (DM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179<br />

Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L 1 ... L 80<br />

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A 1 ... A 3

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