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Signals Spectra and Filters
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amplifier amplitude analog analysis approximation assuming average power bandlimited bandpass bandwidth baseband binary carrier frequency carrier modulation channel chap circuit communication system constant deemphasis defined demodulation detection diagram discrete distortion envelope detector equal Equation error probability Example exponential modulation FIGURE Fourier series Fourier transform frequency domain gaussian Hence HR(f ideal LPF impulse response input integration linear modulation lowpass filter message band message digits modulating signal modulation index multiplexing noise power noise temperature nonlinear parameters phasor Prob pulse shape quantized random signal random variable receiver rectangular pulse sample values Sect shows signal-to-noise ratio sine sinusoid Sketch space spectral density statistically independent symbols synchronous synchronous detection theorem theory threshold tone modulation transfer function transmission bandwidth transmitted variations vector voltage wave waveform white noise xc(t zero