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ŷϵy(tng)зֹ(dng)

C(j)a(chn)ʎͨ(du)C(j)еO(sh)Ӌ(j)ԸM(jn)ӞVȻ@ЩQijɹ޵ġ̎(yng)ԓ]O(sh)(dng)(dng)ĽQĶͨ^(gu)ŷͷŴϵy(tng)ʎ(li)(wn)}

ͨݲVľ

(dng)ڸl°l(f)ģ˂y(tng)(dng)^(gu)VõͨݲVͨVʹŷϵy(tng)ĸl푑(yng)l(f)˥pĶŷϵy(tng)ĎmȻбҪõͨVܱMϲĎKЧ(hu)׃øԓVĽֹlʷ15 kHzF(xin)ŷ늙C(j)Ԅ(dng)(du)ͨVM(jn)O(sh)ãĶڈ(zh)Ԅ(dng){(dio)r(sh)Ml푑(yng)

ݲV͎VƿɌʎ500-1000Ɲ֮gԓ (tng)•{(dio)(ji)r(sh)gL(zhng)(dng)(j)eǴچ(wn)}ԓlʷ߀ڙC(j)ĿÎcͨVݲVһ(xing)(yu)(sh)ܱŷϵy(tng)ĸl푑(yng)@ζ̎ܰȫث@{(dio)Cһɂ(g)ݲVcͨVһʹʹŷϵy(tng)@÷(wn)푑(yng)@?yn)ԓV5001000Hz(ni)چ(wn)}lʡݲVlʺ͎r(sh)(hu)a(chn)һ(g)y}̎ڙzy(c)C(j)Ȼr(sh)ܸ(j)(wn)ıO(sh){(dio)C(hu)ɘOҵ(dng)ͨ^(gu)пٸ~׃Q(FFT)ܛ״_C(j)Ĺl

ŷϵy(tng)ͨ^(gu)ݲVlʹ@һ^(gu)̣ŴĜy(c)^(gu)̣ǰ~M(jn)һ(sh)ʾɜy(c)ݔ̖(ho)lǘŴ·ܜy(c)l(yng)O(sh)ݲVlʎݲVԄ(dng)O(sh)ÿp(dng)һNֶmȻݲVcŷg(sh)ĵͨVһʹпŷŴδ@һ¹

mȻͨVݲVSŷϵy(tng)(dng)C(j)10~500 Hzlʮa(chn)(dng)r(sh)l(f)]ÅsС˽Q@һ(wn)}̎ʹùƺ(dng)M(jn)g(sh)

԰늙C(j)Sigma -5ŷŴơDf(shu)˷ŴĹκ͜pپп (tng)ԺͿҕԣDʾ(dng)ܿһ(g)λ(dng)Y(ji)r(sh)pʎĶsλõ{(dio)(ji)r(sh)gڡ(dng)ע

ʹٶȺD(zhun)̖(ho)늙C(j)D(zhun)r(sh)R(sh)elȻ·(du)ٶȷ̖(ho)M(jn)y(c)lԄ(dng)ԓϢڷŴTҲɌ˜y(c)(sh)wք(dng)O(sh)lҪÑ(h)߀ք(dng){(dio)(sh)a(b)͞Vr(sh)g(sh)M(jn)һŷܡ

(dng)ܿɅλM(jn)^(gu)V(j)lʅ(sh)(du)λ(dng)M(jn)a(b)ԓܿɌ(du)_a(b)ָM(jn)Ӌ(j)㣬mr(sh)ظ(j)lʅ(sh)͌(zhun)㷨ʹ@һָŷŴ㷨Ԅ(dng)zy(c)Ă(g)(sh)Ԅ(dng){(dio)r(sh)(du)M(jn)O(sh)ɹ̎ք(dng)O(sh)áԓܿڄ(dng)Y(ji)r(sh)l(f)a(b)λõąĶ(du)ǰzy(c)(dng)M(jn)a(b)Дؓ(f)d

ͨ^(gu)ڄ(dng)Y(ji)r(sh)p(dng)ʹSC(j){(dio)(ji)r(sh)gs̡@N̎(du)ڏ(f)sķDŽؓ(f)ɵϵy(tng)dzáБҴؓ(f)ɵT(mn)ܱǴ(li)ϵy(tng)һ(g)ܺõķ

(jng)C@Щg(sh)N;аl(f)]á졢̎C(j)F(xin)W(xu)܆(wn)}̓(yu)OEMO(sh)Ӌ(j)

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