First Sentence:
Electric wave filters, called simply as filters in this book, are circuits that are used to selectively filter out some of the frequency components of an input signal and transmit the remaining components as the output signal in such a way that the quality of information contained in the signal is improved.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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digital spectral transformation, equiripple sense, maximally flat sense, mirror image polynomial, prescribed magnitude response, specified magnitude response, magnitude squared function, prescribed group delay, eigen filters, constant group delay response, allpass functions, equiripple response, symmetric lowpass, lowpass prototype filter, passband region, allpass filters, maximally flat approximation, equiripple approximation, stopband region, flat magnitude response, maximally flat magnitude, impulse invariant transformation, recursive digital filters, prototype lowpass, stopband frequency
Key Phrases - Capitalized Phrases (CAPs):
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Fourier Transform, John Wiley, Int'l Sympo, Rayleigh's Principle
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