https://blog.youkuaiyun.com/jiangyangbozh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/jiangyangbo/article/details/83745262https://blog.youkuaiyun.com/jiangyangbo/article/details/83745262jiangyangboMon, 05 Nov 2018 10:57:30 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/51454424https://blog.youkuaiyun.com/jiangyangbo/article/details/51454424jiangyangboThu, 19 May 2016 15:54:49 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/51244513https://blog.youkuaiyun.com/jiangyangbo/article/details/51244513jiangyangboMon, 25 Apr 2016 18:54:52 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/51244507https://blog.youkuaiyun.com/jiangyangbo/article/details/51244507jiangyangboMon, 25 Apr 2016 18:53:12 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/51209119https://blog.youkuaiyun.com/jiangyangbo/article/details/51209119jiangyangboThu, 21 Apr 2016 14:58:21 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/38472229https://blog.youkuaiyun.com/jiangyangbo/article/details/38472229jiangyangboSun, 10 Aug 2014 19:00:50 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/8567433https://blog.youkuaiyun.com/jiangyangbo/article/details/8567433jiangyangboSun, 03 Feb 2013 21:08:37 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/8567425https://blog.youkuaiyun.com/jiangyangbo/article/details/8567425jiangyangboSun, 03 Feb 2013 21:06:11 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/8567362https://blog.youkuaiyun.com/jiangyangbo/article/details/8567362jiangyangboSun, 03 Feb 2013 20:19:44 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/8567358https://blog.youkuaiyun.com/jiangyangbo/article/details/8567358jiangyangboSun, 03 Feb 2013 20:17:28 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/8002429https://blog.youkuaiyun.com/jiangyangbo/article/details/8002429jiangyangboFri, 21 Sep 2012 00:32:40 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/7235417https://blog.youkuaiyun.com/jiangyangbo/article/details/7235417jiangyangboSun, 05 Feb 2012 21:28:48 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6558672https://blog.youkuaiyun.com/jiangyangbo/article/details/6558672jiangyangboTue, 21 Jun 2011 14:37:00 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6558637https://blog.youkuaiyun.com/jiangyangbo/article/details/6558637jiangyangboTue, 21 Jun 2011 14:29:00 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6543947https://blog.youkuaiyun.com/jiangyangbo/article/details/6543947jiangyangboTue, 14 Jun 2011 15:31:00 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6535928https://blog.youkuaiyun.com/jiangyangbo/article/details/6535928jiangyangboFri, 10 Jun 2011 11:02:00 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6229360https://blog.youkuaiyun.com/jiangyangbo/article/details/6229360jiangyangboMon, 07 Mar 2011 15:56:00 +0800       
  这是一个关于忠诚和忠告的故事。
  一个男人新婚不久，由于家境贫寒，决定出外谋生。在外遇到一个好心的木雕工艺大师收他做了学徒，并同他约定：当他学成出师的时候就可以离开并且有工钱。做了学徒二十年，男人学会制作木雕的方方面面，终于学成出师可以回家。师傅问他：你是要二十年的工钱还是要三句忠告？男人说我明天上路，明早给你您答案好吗？师傅说可以。
    当晚男人彻夜未眠。早晨，他对师傅说：我要三个忠告。于是师傅给了他三句话。一、不要试图寻找不可能的捷径]]>https://blog.youkuaiyun.com/jiangyangbo/article/details/6208584https://blog.youkuaiyun.com/jiangyangbo/article/details/6208584jiangyangboFri, 25 Feb 2011 20:56:00 +0800
音量又称响度、音强，是指人耳对所听到的声音大小强弱的主观感受，其客观评价尺度是声音的振幅大小。这种感受源自物体振动时所产生的压力，即声压。物体振动通过不同的介质，将其振动能量传导开去。人们为了对声音的感受量化成可以监测的指标，就把声压分成“级”——声压级，以便能客观的表示声音的强弱，其单位称为“分贝”（dB）。
音量的计算
1，声音数据data,长度为len
方法1，音量为声音的最大值减去最小值的一半,类似均值。
 function vol1 ]]>https://blog.youkuaiyun.com/jiangyangbo/article/details/6185203https://blog.youkuaiyun.com/jiangyangbo/article/details/6185203jiangyangboTue, 15 Feb 2011 09:07:00 +0800https://blog.youkuaiyun.com/jiangyangbo/article/details/6105740https://blog.youkuaiyun.com/jiangyangbo/article/details/6105740jiangyangboWed, 29 Dec 2010 20:04:00 +0800Y = fft(y,1024);
Pyy = Y.* conj(Y)/1024;
f = fs*(0:512)/1024;
figure;
plot(f,Pyy(1:513));
f是每个fft 的 bin上的中心频率]]>