问题
I am trying to do the following
I am getting a call to another person using my java application (Already done & works fine).
Then I am playing a recording, for example "Please press 1 one to continue in english" (Already done & works fine).
Now I want to detect that person press one, As per my researches in google search I got that this can do using DTMF.If the person press 1 I want to do the actions according to my condition.
My question is how to detect that number using DTMF in java (J2SE). I am using ZTE USB dongle to make the call. Dialing, Hangup, And other controls did by using AT commands + Java IO.
Here is my example code, but it is not giving the correct dial number and its looping every time.
public class zxczczz extends javax.swing.JFrame {
/**
* Creates new form zxczczz
*/
public zxczczz() {
initComponents();
}
float[] lowFreq = new float[]{697.0F, 770.0F, 852.0F, 941.0F};
float[] highFreq = new float[]{1209.0F, 1336.0F, 1477.0F, 1633.0F};
float[] dtmfTones = new float[]{697.0F, 770.0F, 852.0F, 941.0F, 1209.0F, 1336.0F, 1477.0F, 1633.0F};
int dtmfBoard[][] = {{1, 2, 3, 12}, {4, 5, 6, 13}, {7, 8, 9, 14}, {10, 0, 11, 15}};
byte[] buffer = new byte[2048];
static final char FRAME_SIZE = 160;
AudioFormat format = getAudioFormat();
int[] buf;
public boolean wait = false;
static boolean continueParsingDtmf = false;
public AudioFormat getAudioFormat() {
// float sampleRate = 8000.0F;
float sampleRate = 44100.0F;
//int sampleSizeInBits = 16;
int sampleSizeInBits = 8;
int channels = 1;
boolean signed = true;
boolean bigEndian = true;
return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
}
public class DtmfCapture extends Thread {
public void run() {
continueParsingDtmf = true;
try {
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
TargetDataLine out = (TargetDataLine) AudioSystem.getLine(info);
out.open(format);
out.drain();
out.start();
int count = 0;
while (continueParsingDtmf) {
byte[] buffer = new byte[2048];
//grab audio data
count = out.read(buffer, 0, buffer.length);
if (count >= 0) {
zxczczz.DecodeDtmf dtmf = new zxczczz.DecodeDtmf(buffer);
if (!wait) {
dtmf.start(); //look for dtmf
// System.out.println("aaaaaa");
Thread.sleep(100);
} else {
Thread.sleep(1000);// wait before searching again
System.out.println(System.currentTimeMillis());
wait = false;
}
}
}
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
public class DecodeDtmf extends Thread {
byte[] buffer;
DecodeDtmf(byte[] buffer) {
this.buffer = buffer;
}
public void run() {
int[] buf;
buf = new int[buffer.length / 2];
for (int j = 0; j < buffer.length / 2 - 1; j++) {
buf[j] = (int) ((buffer[j * 2 + 1] & 0xFF) + (buffer[j * 2] << 8));
}
int tone = findDTMF(buf);
if (tone >= 0) {
wait = true;
if (tone < 10) {
System.out.println(" THE TONE IS : " + tone);
}
if (tone == 12) {
// System.out.println(" THE TONE IS : A");
// }
// if (tone == 13) {
// System.out.println(" THE TONE IS : B");
// }
// if (tone == 14) {
// System.out.println(" THE TONE IS : C");
// }
// if (tone == 15) {
// System.out.println(" THE TONE IS : D");
// }
if (tone == 10) {
// System.out.println(" THE TONE IS : *");
}
if (tone == 11) {
// System.out.println(" THE TONE IS : #");
}
}
}
/*
Check if sample has dtmf tone
*/
public int findDTMF(int[] samples) {
double[] goertzelValues = new double[8];
double lowFreqValue = 0;
int lowFreq = 0;
double sumLow = 0;
double highFreqValue = 0;
int highFreq = 0;
double sumHigh = 0;
for (int i = 0; i < 8; i++) {
goertzelValues[i] = goertzel(samples, dtmfTones[i]);
}
// System.out.println("aa="+goertzelValues);
for (int i = 0; i < 4; i++) // Find st?rste low frequency
{
sumLow += goertzelValues[i]; // Sum til signal-test
if (goertzelValues[i] > lowFreqValue) {
lowFreqValue = goertzelValues[i];
lowFreq = i;
}
// System.out.println("low = "+i);
}
for (int i = 4; i < 8; i++) // Find st?rste high frequency
{
sumHigh += goertzelValues[i]; // Sum til signal-test
if (goertzelValues[i] > highFreqValue) {
highFreqValue = goertzelValues[i];
highFreq = i - 4;
}
}
if (lowFreqValue < sumLow / 2 || highFreqValue < sumHigh / 2) // Test signalstyrke
{
return -1;
}
// System.out.println("aaa="+dtmfBoard[lowFreq][highFreq]);
return dtmfBoard[lowFreq][highFreq]; // Returner DTMF tone
}
}
public double goertzel(int[] samples, float freq) {
double vkn = 0;
double vkn1 = 0;
double vkn2 = 0;
for (int j = 0; j < samples.length - 1; j++) {
vkn2 = vkn1;
vkn1 = vkn;
vkn = 2 * Math.cos(2 * Math.PI * (freq * samples.length / format.getSampleRate()) / samples.length) * vkn1 - vkn2 + samples[j];
}
double WNk = Math.exp(-2 * Math.PI * (freq * samples.length / format.getSampleRate()) / samples.length);
//System.out.println(WNk);
return Math.abs(vkn - WNk * vkn1);
}
}
Please Help me.
回答1:
i was looking for the same thing for DTMF Detection in ActionScript i found something maybe you can recode this in java
package {
import flash.utils.ByteArray;
public class DTMFprocessor
{
/*
The following constants are used to find the DTMF tones. The COL1 is the column Hz that we
are searching for, and the COL2 is the row Hz. The DTMF_LAYOUT is the order that the cols and
rows intersect at.
*/
private static const COL1:Array = [697, 770, 852, 941];
private static const COL2:Array = [1209, 1336, 1477, 1633];
private static const DTMF_LAYOUT:Array = [ ["1","2","3","A"] ,
["4","5","6","B"] ,
["7","8","9","C"] ,
["*","0","#","D"] ];
private var sampleRate:int;
private var lastFound:String = "";
public var DTMFToneSensitivity:int = 15;
/**
* DTMF Processor Constructor
*
* @param sampleRate This is the sample rate, in frames per second that the application is operating in.
*
*/
public function DTMFprocessor(sampleRate:int = 44100)
{
this.sampleRate = sampleRate;
}
/**
* Generates DTMF byteArrays that can be played by the Sound() object.
*
* @param length length, in ms that the tone will be generated for.
* @param tone the string representing the tone that will be generated [0-9, A-D, *, #]
* @return the byteArray that contains the DTMF tone.
*
*/
public function generateDTMF(length:int, tone:String):ByteArray
{
var mySound:ByteArray = new ByteArray();
var neededSamples:int = Math.floor(length * sampleRate / 1000);
var mySampleCol:Number = 0;
var mySampleRow:Number = 0;
var hz:Object = findDTMF(tone.charAt(0));
for (var i:int = 0; i < neededSamples; i++)
{
mySampleCol = Math.sin(i * hz.col * Math.PI * 2 / sampleRate) * 0.5;
mySampleRow = Math.sin(i * hz.row * Math.PI * 2 / sampleRate) * 0.5;
mySound.writeFloat(mySampleRow + mySampleCol);
}
return mySound;
}
/**
* Searches a ByteArray (from a Sound() object) for a valid DTMF tone.
*
* @param tone ByteArray that should contain a valid DTMF tone.
* @return string representation of DTMF tones. Will return a blank string ('') if nothing is found
*
*/
public function searchDTMF(tone:ByteArray):String
{
var position:int = 0;
var charFound:String = "";
// seed blank values for strongest tone to be found in the byteArray
var maxCol:int = -1;
var maxColValue:int = 0;
var maxRow:int = -1;
var maxRowValue:int = 0;
var foundTones:String = "";
// reset the byteArray to the beginning, should we have gotten it in any other state.
tone.position = position;
// break up the byteArray in manageable chunks of 8192 bytes.
for (var bufferLoop:int =0; bufferLoop < tone.bytesAvailable; bufferLoop =+ 8192)
{
position = bufferLoop;
// search for the column tone.
for (var col:int = 0; col < 4; col++)
{
if (powerDB(goertzel(tone,8192,COL1[col],position)) > maxColValue)
{
maxColValue = powerDB(goertzel(tone,8192,COL1[col],position));
maxCol = col;
}
}
// search for the row tone.
for (var row:int = 0; row < 4; row++)
{
if (powerDB(goertzel(tone,8192,COL2[row],position)) > maxRowValue)
{
maxRowValue = powerDB(goertzel(tone,8192,COL2[row],position));
maxRow = row;
}
}
// was there enough strength in both the column and row to be valid?
if ((maxColValue < DTMFToneSensitivity) || (maxRowValue < DTMFToneSensitivity))
{
charFound = "";
}
else
{
charFound = DTMF_LAYOUT[maxCol][maxRow];
}
if (lastFound != charFound)
{
trace("Found DTMF Tone:",charFound);
lastFound = charFound; // this is so we don't have duplicates.
foundTones = foundTones + lastFound;
}
}
return foundTones;
}
/**
* Converts amplitude to dB (power).
*
* @param value amplitude value
* @return dB
*
*/
private function powerDB(value:Number):Number
{
return 20 * Math.log(Math.abs(value))*Math.LOG10E;
}
/**
* This function returns the amplitude of the a seeked wave in the buffer.
*
* @param buffer the byteArray that is being searched.
* @param bufferSize the size of the buffer that we wish to search.
* @param frequency the frequency (in Hz) that we are searching for.
* @param bufferPos the starting point that we want to search from.
* @return amplitude of the searched frequency, if any.
*
*/
private function goertzel(buffer:ByteArray, bufferSize:int, frequency:int, bufferPos:int):Number
{
var skn:Number = 0;
var skn1:Number = 0;
var skn2:Number = 0;
buffer.position = bufferPos;
for (var i:int=0; i < bufferSize; i++)
{
skn2 = skn1;
skn1 = skn;
if (buffer.bytesAvailable > 0)
skn = 2 * Math.cos(2 * Math.PI * frequency / sampleRate) * skn1 - skn2 + buffer.readFloat();
}
var wnk:Number = Math.exp(-2 * Math.PI * frequency / sampleRate);
return (skn - wnk * skn1);
}
/**
* Returns the Hz of the string tone that is searched.
*
* @param tone character that is being search for
* @return an untyped object that has col and row properties that contain the Hz of the DTMF tone.
*
*/
private function findDTMF(tone:String):Object
{
var myDTMF:Object = new Object();
switch(tone)
{
case "1":
myDTMF.col = COL1[0];
myDTMF.row = COL2[0];
break;
case "2":
myDTMF.col = COL1[0];
myDTMF.row = COL2[1];
break;
case "3":
myDTMF.col = COL1[0];
myDTMF.row = COL2[2];
break;
case "A":
myDTMF.col = COL1[0];
myDTMF.row = COL2[3];
break;
case "4":
myDTMF.col = COL1[1];
myDTMF.row = COL2[0];
break;
case "5":
myDTMF.col = COL1[1];
myDTMF.row = COL2[1];
break;
case "6":
myDTMF.col = COL1[1];
myDTMF.row = COL2[2];
break;
case "B":
myDTMF.col = COL1[1];
myDTMF.row = COL2[3];
break;
case "7":
myDTMF.col = COL1[2];
myDTMF.row = COL2[0];
break;
case "8":
myDTMF.col = COL1[2];
myDTMF.row = COL2[1];
break;
case "9":
myDTMF.col = COL1[2];
myDTMF.row = COL2[2];
break;
case "C":
myDTMF.col = COL1[2];
myDTMF.row = COL2[3];
break;
case "*":
myDTMF.col = COL1[3];
myDTMF.row = COL2[0];
break;
case "0":
myDTMF.col = COL1[3];
myDTMF.row = COL2[1];
break;
case "#":
myDTMF.col = COL1[3];
myDTMF.row = COL2[2];
break;
case "D":
myDTMF.col = COL1[3];
myDTMF.row = COL2[2];
break;
default:
myDTMF.col = 0;
myDTMF.row = 0;
}
return myDTMF;
}
}
}
回答2:
I don't know enough to help you out, but have you seen the DTMF implentation in TarsosDSP on github?
来源：https://stackoverflow.com/questions/17539366/java-j2se-dtmf-tone-detection