Use a graphing utility to graph the sound emitted by the * key on a Touch-Tone phone.

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Use a graphing utility to graph the sound emitted by the * key on a Touch-Tone phone. See Problem 57.


Data from problem 57

On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by

y = sin(27lt) and y = sin(27ht)|


where l and h are the low and high frequencies (cycles per second) shown in the illustration. For example, if you touch 7, the low frequency is l = 852 cycles per second and the high frequency is h = 1209 cycles per second. The sound emitted by touching 7 is

y = sin[27 (852)t] + sin[2#(1209)t] %3D


Use a graphing utility to graph the sound emitted by touching 7.

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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