public byte[] generateTone(float a, float b)
{
byte samples[] = new byte[16000]; // Tone data buffer.
int frames = samples.length / 2; // Number of frames that fit in the buffer.
/* Fill the buffer with the tone data. */
for(int i = 0; i < frames; i++)
{
/* The 8000 value is the sample rate. */
short value = (short)(32768 + 63 * Math.sin(i * 2 * Math.PI * a / 8000) + 63 * Math.sin(i * 2 * Math.PI * b / 8000));
samples[i + i] = (byte)(value >>> 8);
samples[i + (i + 1)] = (byte)value;
}
return samples;
}
我希望这会有所帮助...只需将两个频率作为参数 a 和 b 插入，您就会得到一个音调。 例如，第一名将生成为：
byte tone[] = generateTone(697, 1209);
Well the following function will generate a 16-bit, signed, linear PCM, DTMF tone in Java.
public byte[] generateTone(float a, float b)
{
byte samples[] = new byte[16000]; // Tone data buffer.
int frames = samples.length / 2; // Number of frames that fit in the buffer.
/* Fill the buffer with the tone data. */
for(int i = 0; i < frames; i++)
{
/* The 8000 value is the sample rate. */
short value = (short)(32768 + 63 * Math.sin(i * 2 * Math.PI * a / 8000) + 63 * Math.sin(i * 2 * Math.PI * b / 8000));
samples[i + i] = (byte)(value >>> 8);
samples[i + (i + 1)] = (byte)value;
}
return samples;
}
I hope this helps... Just plug in the two frequencies as parameters a and b and out you get a tone. For example number one would be generated as:
DTMF only covers the digits 0 to 9 and letters #, *, A, B, C, and D. So if your question is does there exist anything that supports letters after D, then the answer is no.
"DTMF "Touch" Tones are defined in CCITT Volume VI: General Recommendations on Telephone Switching and Signalling Recommendation Q.23: Technical Features of Push-Button Telephone Sets.". This document and its related standard documents will tell you more than you would ever want to know about DTMF tones. "
This quote is from here. That webpage covers all the basics.
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下面的函数将在 Java 中生成 16 位、有符号、线性 PCM、DTMF 音调。
我希望这会有所帮助...只需将两个频率作为参数 a 和 b 插入，您就会得到一个音调。 例如，第一名将生成为：
Well the following function will generate a 16-bit, signed, linear PCM, DTMF tone in Java.
I hope this helps... Just plug in the two frequencies as parameters a and b and out you get a tone. For example number one would be generated as:
DTMF 仅涵盖数字
0到9和字母#、*、A、B、C、和D。 因此，如果您的问题是是否存在支持 D 后面字母的任何内容，那么答案是否定的。DTMF only covers the digits
0to9and letters#, *, A, B, C,andD. So if your question is does there exist anything that supports letters after D, then the answer is no.“DTMF“触摸”音在 CCITT 第 VI 卷：电话切换和信令建议 Q.23 的一般建议：按钮式电话机的技术特性中定义。”。 本文档及其相关标准文档将告诉您有关 DTMF 音调的更多信息，超出您的想象。 "
此引述来自此处。该网页涵盖了所有基础知识。
"DTMF "Touch" Tones are defined in CCITT Volume VI: General Recommendations on Telephone Switching and Signalling Recommendation Q.23: Technical Features of Push-Button Telephone Sets.". This document and its related standard documents will tell you more than you would ever want to know about DTMF tones. "
This quote is from here. That webpage covers all the basics.