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1
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A
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13
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锛堢粡杩?/p>
7/11
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a
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b
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c
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d
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(d)
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澶?/p>
x(t)
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f
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f
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b
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c
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d
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(a)
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螖M
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a
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c
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d
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d
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4
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a
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b
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c
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d
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d
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5
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a
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b
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c
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d
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锛?/p>
a
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璁＄畻棰橈細
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85
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1
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Q
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fs
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)
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1
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2
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1
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4
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2
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鍙緱锛?
2
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50mV
锛屾娊鏍烽鐜囦负
32kHz
锛屾眰褰撹緭鍏ヤ俊鍙蜂负
800
Hz
Q
f
Q
f
R
m
s
B
2
2
2
log
log
飩?/p>
飥?/p>
飩?/p>
飥?/p>
飥?/p>
飥?/p>
s
f
dt
t
dx
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max
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飦?/p>
飦?/p>
飦?/p>
m
m
s
s
m
m
A
f
f
A
飩?
飩?/p>
飦?
飦?/p>
m
m
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R
飥?
Q
f
m
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2
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飦?
飦?/p>
m
m
A
飥?
Q
A
Q
f
A
m
m
m
m
2
2
2
log
log
飦?
飦?/p>
飦?/p>
飥?/p>
飥?