Matlab模擬鋼琴識別琴譜

音符頻率對應表

音符	頻率/HZ	半週期/us	音符	頻率/HZ	半週期/us
低1DO	262	1908	#4FA#	740	0676
#1DO#	277	1805	中5SO	784	0638
低2RE	294	1700	#5SO#	831	0602
#2RE#	311	1608	中6LA	880	0568
低3M	330	1516	#6LA#	932	0536
低4FA	349	1433	中7SI	988	0506
#4FA#	370	1350	高1DO	1046	0478
低5SO	392	1276	#DO#	1109	0451
#5SO#	415	1205	高2RE	1175	0426
低6LA	440	1136	#2RE#	1245	0402
#6LA#	466	1072	高3M	1318	0372
低7SI	494	1012	高4FA	1397	0358
中1DO	523	0956	#4FA#	1480	0338
#1DO#	554	0903	高5SO	1568	0319
中2RE	578	0842	#5S0#	1661	0292
#2RE#	622	0804	高6LA	1760	0284
中3M	659	0759	#6LA#	1865	0268
中4FA	698		0716	高7SI	1976

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("#"表示半音,用於上升或下降半個音)

我們知道用Matlab的sound函數可以發聲，但是那種聲音是很難聽的“電話鈴聲”，那該怎麼模擬成鋼琴音色呢？

每個音符有固定的基音頻率，表格如上。

matlab實測

接下來，我們打開matlab

f=440;
fs=8000;
t=1/fs:1/fs:1;
x=sin(2*pi*f*t);
sound(x,fs);

這樣點擊運行的話，是一聲電話音

%matlab 唱生日快樂
Fs = 8192;

%1-1
y1 = gen_wave(5,0.5,0.5);
y2 = gen_wave(5,0.5,0.5);
y3 = gen_wave(6,1,0.5);
y4 = gen_wave(5,1,0.5);
y5 = gen_wave(1,1,1);
y6 = gen_wave(7,2,0.5);
y = [y1,y2,y3,y4,y5,y6];

y1 = gen_wave(5,0.5,0.5);
y2 = gen_wave(5,0.5,0.5);
y3 = gen_wave(6,1,0.5);
y4 = gen_wave(5,1,0.5);
y5 = gen_wave(2,1,1);
y6 = gen_wave(1,2,1);
y = [y,y1,y2,y3,y4,y5,y6];

y1 = gen_wave(5,0.5,0.5);
y2 = gen_wave(5,0.5,0.5);
y3 = gen_wave(5,1,1);
y4 = gen_wave(3,1,1);
y5 = gen_wave(1,1,1);
y6 = gen_wave(7,1,0.5);
y7 = gen_wave(6,1,0.5);
y = [y,y1,y2,y3,y4,y5,y6,y7];

y1 = gen_wave(4,0.5,1);
y2 = gen_wave(4,0.5,1);
y3 = gen_wave(3,1,1);
y4 = gen_wave(1,1,1);
y5 = gen_wave(2,1,1);
y6 = gen_wave(1,2,1);
y = [y,y1,y2,y3,y4,y5,y6];


sound(y,Fs);
%A bit little slow