SOLVED:Touch-Tone Phones On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by$$y=sin (2 pi l t) quad ext { and } quad y=sin (2 pi h t)$$where $l$ and $h$ are the low and high frequencies (cycles per second) shown on 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 when you touch 7 is $$y=sin [2 pi(852) t] sin [2 pi(120

An ode to rotary phones

Touch-Tone Phones On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by y=sin(2 πl t) and y=sin(2 πh t) 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[2 π(852) t] sin[2 π(1209) t] (GRAPH NOT COPY) | Numerade

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