## Basic communication theory: a teacher's eye view of the way non-mathematicians see the mathematics and use of the basic ideas of modulation |

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### Contents

Introduction | 1 |

Fourier series | 21 |

Fourier transforms | 39 |

Copyright | |

16 other sections not shown

### Common terms and phrases

amplitude modulation amplitude spectrum analogue modulation analogue signal audio balanced modulator band limited baseband baseband bandwidth baseband signal basic binary bit rate bit stream capacitor carrier frequency changes coct coding com)t communication system companding comt constant cos(coc cosine demodulation digital signals diode division multiplexing DSBSC envelope detector example expression frequency modulation give harmonics integrated linear low-pass filter modulated signal modulation index multilevel NBFM NBPM noise Nyquist frequency obtained occurs original baseband output phase modulation phase shift phasor phasor diagram Problem pulse train quadrature quantization radio rotating phasor sample height sampled signal shift keying shown in Figure simple single sinusoid baseband sinusoid Sketch spectra square wave standard stationary phasor symmetry telephone channel teleprinter transfer function transmission transmitted tuned circuit V(co values voice frequency voltage waveform WBFM WBPM