
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Transcribed Image Text:When a key is pressed on a touch-tone telephone, the keypad generates two pure
tones, which combine to produce a sound that uniquely identifies the key. The figure
shows the low frequency f1 and the high frequency f2 associated with each key.
Pressing a key produces the sound wave y = sin(2nfzt) + sin(2xf2t).
High frequency f2
1209 1336 1477 Hz.
697 Hz + 1
Low
770 Hz + 4
6.
frequency
852 Hz
8.
941 Hz
(a) Find the function that models the sound produced when the 9 key is
pressed.
y = sin(17047t) + sin(2954rt)
(b) Use a Sum-to-Product Formula to express the sound generated by the 9
key as a product of a sine and a cosine function.
y =
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