Created
July 23, 2022 05:11
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模擬電話撥號音，可自行用手機測試。一般的電話鍵，在按下的時候會產生一個聲音，基本上每個聲音由兩種主要的音頻合成，稱為雙音多頻(Dual Tone Multi Frequency)。
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| % dial | |
| N = 8192*0.5; | |
| n = 0:N-1; | |
| x = 0.5*n/N; | |
| y1 = sin(2*pi*697*x)+sin(2*pi*1209*x); | |
| y2 = sin(2*pi*697*x)+sin(2*pi*1336*x); | |
| y3 = sin(2*pi*697*x)+sin(2*pi*1477*x); | |
| y4 = sin(2*pi*770*x)+sin(2*pi*1209*x); | |
| y5 = sin(2*pi*770*x)+sin(2*pi*1336*x); | |
| y6 = sin(2*pi*770*x)+sin(2*pi*1477*x); | |
| y7 = sin(2*pi*697*x)+sin(2*pi*1209*x); | |
| y8 = sin(2*pi*941*x)+sin(2*pi*1336*x); | |
| y9 = sin(2*pi*697*x)+sin(2*pi*1477*x); | |
| y0 = sin(2*pi*941*x)+sin(2*pi*1336*x); | |
| z = zeros(1,512); % space | |
| sound([y5 z y0 z y1 z y2 z y0]) |
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