dual tone horn,dual horn

Evolution that glossary of Chinese from monosyllable till disyllable is among the intrinsic rule of the progress of history of Chinese, and the significant point of development of expression.

汉语词汇由单音词向双音词发展是汉语史发展的内部规律之一，也是汉语语法发展的一大特点。

Decoding of DTMF signal with software;

双音多频信号的软件解码

The Novel Design of CPLD Application in DTMF Tone PCM Code;

基于CPLD的双音多频信号PCM编码的设计

Control for coder/encoder of DTMF with single chip microcomputer;

利用单片机实现对双音多频编/解码器的控制

The ancient documents available indicate that the words of old Chinese seem to be mainly labic, but some poems whiten in Zhou Qin period, for example, these in Shi Jing and Chu Ci, record a large number of mono-morphemic disyllables, which are called lian mian n by Chinese scholars.

从文献观察，这些双音节词在当时，尤其是在后来的汉代，又以意义相同、语音相近的单音节词出现。

The disyllable conjunction ran er(然而)in Classic Chinese;

上古汉语的双音节连词“然而”

The variety of formants tracks of vowel of the first syllable in disyllables of mandarin is studied.

主要考察在汉语普通话双音节中,第一音节元音韵母和不同第二音节声母组合时对第一个音节元音共振峰轨迹的影响。

+da+noun" phrases in modern Chinese can be quantified,and they are mainly disyllable abstract nouns which can be classified according to subjects of　reason, characteristics, information, organization, event and tactic.

现代汉语"数词+大+名词"短语中的名词都可以量化,以双音节抽象名词为主。