Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 21 - Think and Explain - Page 402-403: 62


The telephone can't transmit all the frequencies present in a piece of music.

Work Step by Step

Fourier discovered that any periodic wave pattern, no matter how complex, can be built up by adding sine waves of different frequencies. This is discussed on page 398. Sound that comes through the telephone is missing the lower and higher-frequency partial tones of music that contribute to its timbre.
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