我正在研究音频调谐器应用程序以调整乐器.
用户应该播放一个音符,然后在我的应用程序中,我应该显示它有哪个频率.

首先,我应该访问麦克风？

AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,sampleRate,AudioFormat.CHANNEL_IN_STEREO,AudioFormat.ENCODING_PCM_16BIT,bufferSize);

然后我需要计算声音的频率.我怎样才能做到这一点？

> http://www.psychicorigami.com/2009/01/17/a-5k-java-guitar-tuner/
> http://www.codeproject.com/Articles/32172/FFT-Guitar-Tuner

编辑：
我认为我可以更好地链接到这个网站上的许多替代品,人们试图制作吉他调音器.

> How to create tuner that runs continuously?
> Sound convertion to frequency in android
> Real time pitch detection

重新编辑：
FFT.java

解决了我的问题. (没有正确链接,因为我是新用户)

<%
starttime=cdate("2013-09-08") ''项目开始时间
endtime="" ''项目结束时间
num=8 ''项目需要的天数
response.write "开始时间："&starttime&"<br>天数："&num&"<br>结束时间："
starttime=starttime-1
i=1
while i <= num
	starttime=starttime+1
	w=weekday(starttime) 
	if w>1 and w<7 then ''非周末
		endtime=starttime
		i=i+1	
	else ''周末休息
	end if
wend
response.write endtime
%>

#端口配置列表
[server]
port_rpc_admin_local
port_peer
port_ws_admin_local

#http端口配置
[port_rpc_admin_local]
port = 5005
ip = 127.0.0.1
admin = 127.0.0.1
protocol = http

#peer端口配置，用于p2p节点发现
[port_peer]
port = 51235
ip = 0.0.0.0
protocol = peer

#websocket端口配置
[port_ws_admin_local]
port = 6006
ip = 127.0.0.1
admin = 127.0.0.1
protocol = ws

#对等连接的其他主机的ip，以及对于的peer端口设置
[ips_fixed]  
10.11.6.116 51236
10.11.6.117 51237
10.11.6.118 51238

{
   "id" : 1,
   "result" : {
      "status" : "success",
      "validation_key" : "OTT SOME DEE WOVE EAT SOME QUOD KUDO NIP HOW LEER HOSE",
      "validation_private_key" : "pcvYu2QigM37t2jGar6EJSsRSdsV7H63R2Ae52WTZycZqNseT8a",
      "validation_public_key" : "n9KnRfJ3wnCF8WaGmhf3EENSfMxc3KyWLzEKXmnP5pssZkci53DV",
      "validation_seed" : "xxSm9kEKBDqrrfskWJV8wXRc6izLQ"
   }
}

''use strict'';
const ChainsqlAPI = require(''chainsql'').ChainsqlAPI;
const c = new ChainsqlAPI();

var owner = {
        secret: "xnoPBzXtMeMyMHUVTgbuqAfg1SUTb",
        address: "zHb9CJAWyB4zj91VRWn96DkukG4bwdtyTh"
}
//var user ={
//  secret: ''xx26wgq6XbnTLrNgDn21dqjBMsD38'',
//  address: ''zp7mxMmrDwAGQqPeSBpT5wKaM4RpGaKWeW''
//}

let account = c.generateAddress();
console.log(account)

c.connect(''ws://127.0.0.1:6006'').then( ()=>{
        console.log(''连接成功'')
   c.as(owner);    //这里owner指一个有足够zxc的账户，第一个转账操作肯定要用根账户               
   let ret = c.pay(account.address,100000000).then((ret)=>{
   console.log(ret);
  })
}
);

var amount = {
value: 20000
}
res = await c.pay(user.address, amount).submit({ expect: ''validate_success'' })
console.log(res)

''use strict'';
const ChainsqlAPI = require(''chainsql'').ChainsqlAPI;
const r = new ChainsqlAPI();

var user = {
        secret: ''xpiCV45NQ3bRxPJvmjBgkTLPwMqAC'',
  address: ''zNn8qGS3spd8vyRJ88NpymiGEqKxvxgikY'',
  publicKey: ''cBQFdZcmk5xsbqN8yPvk1Ay9L4PrgviGwcHxzoT7gN2XRtfqXzRR''
}
r.connect(''ws://127.0.0.1:6006'', function(err, data) {
        if (err) {
                console.log(''连接失败. '');
        return
        }
    console.log(''连接成功'');
    r.as(user);
        r.createTable("dc_universe", [
        {
                ''field'':''id'',
                ''type'':''int'',
                ''length'':11,
                ''PK'':1,
                ''NN'':1,
                ''UQ'':1
        },
        {
                ''field'':''name'',
                ''type'':''varchar'',
                ''length'':50,
                ''default'':null
        },
        {
                ''field'':''age'',
                ''type'':''int''
        }]
        ).submit();
        r.table("dc_universe").insert({id:1, name: ''peera'',age: 22},{id:2, name: ''peerb'',age: 21}).submit();
         getLedger();
});

function getLedger() {
        r.getLedger({
                ledgerVersion: 22
        }, function(err, data) {
                console.log(err, data)
        })
}

''use strict'';
const ChainsqlAPI = require(''chainsql'').ChainsqlAPI;
const c = new ChainsqlAPI();


var root = {
         secret: ''xnoPBzXtMeMyMHUVTgbuqAfg1SUTb'',
  address: ''zHb9CJAWyB4zj91VRWn96DkukG4bwdtyTh''
}

var user ={
  secret: ''xx26wgq6XbnTLrNgDn21dqjBMsD38'',
  address: ''zp7mxMmrDwAGQqPeSBpT5wKaM4RpGaKWeW''
}
c.connect(''ws://127.0.0.1:6006'').then( async ()=>{
        console.log(''连接成功'')
   c.as(root);    //这里owner指一个有足够zxc的账户，第一个转账操作肯定要用根账户               
   c.setRestrict(false);
  // var raw=[ { id: 61, name: ''peer61'', age: 71 },{ id: 62, name: ''peer62'', age: 72 }];
  var raw=[];
   for(var i=62;i<67;i++){
        raw.push({''id'':i, ''name'': ''peer''+i,''age'': i+10});
    //  var raw=[{id:15+i, name: ''gqx''+i,age: 23+i}];
     //   console.log(raw);
   //    c.table("dc_universe").insert(raw).submit({expect:''db_success''});
    }
 // console.log(raw); 
  // var raw=[
//      {''id'':7, ''name'': ''gqx11'',''age'': 25},
//      {''id'':8, ''name'': ''gqx22'',''age'': 45},
  //      {''id'':9, ''name'': ''gqx33'',''age'': 64}
  // ]
  // var rs=await c.table("dc_universe").insert(raw).submit({expect:"db_success"});
  // console.log(rs);
  var opt = {limit:200}
  c.getTransactions(''zp7mxMmrDwAGQqPeSBpT5wKaM4RpGaKWeW'',opt,callback);

}
);

function callback(err,data){
        if(err){
                console.error(err);
        }else{
                console.log(JSON.stringify(data));
        }
}