tone signal

I tried to call you several times, but there was no signal tone on your line.

不是他电话一直占线，是他的电话一直没有信号。打过去没有接受的声音的。

This paper introduces the concept of the HF multitone parallel signal and the technical standard of the 39 tone parallel signal, describes the principle of the 39 tone parallel signal and presents a way to realize the real time demodulation with the TMS320C30/ C31.

本文介绍了短波多音并行信号的概念及39音并行信号的技术规格，论述解调39音并行信号的原理，给出一种用TMS320C30/C31实时解调的实现方法。

From simulation results, the third-order inter-modulation distortion ratio ( IMD3) can be reduced by-10 dB on average when a two-tone signal is input. Finally, the bias-controlled predistorter has been used in OFDM system.

从仿真结果可以总结出，当系统采用双音信号作为输入时，功率放大器输出的三阶互调失真可以平均减少10dB。最后，将二极管偏压控制预失真器应用于OFDM系统中。

By analysis based on time-domain and frequency-domain, the producing and formative mechanism of acoustic signal is approached, and the tone channel is put forward.

基于电弧声信号的时域与频域特征分析，讨论了电弧声产生机理，提出了电弧声道概念。

Ringback music, also called personalized ringback tone, is a piece of music heard by the caller instead of the traditional telephone ring signal when a telephone call is placed.

彩铃，也就是个性化的电话铃音，当有电话响时用一首歌代替了传统的电话铃声。

Now a stored program control switch is simulated on a cheap micro-computer. All hardware movements of it are realized by software simulation, and calling processing can be carried out. It has various functions such as signal tone, ringing and talking etc.

在廉价的微机上实现程控数字交换机的模拟，该模拟交换机所有硬件动作均由软件模拟完成，它能进行呼叫处理，并有各种信号音、振铃和通话等各种功能。

A language that uses tones to signal "word meanings and grammatical categories" is called Tone Language.

凡是用声调作为手段来表示“词汇意义和词的语法意义”的语言，被称为“声调语言”；

Echo canceller is generally consisted of adaptive filter, single tone signal detector, far signal detector, near signal detector, nonlinear processor of the remaining echo and comfortable noise generator and other accessories.

回波抵消器一般由自适应滤波器、单音信号检测器、远端信号检测器、近端信号检测器、剩余回波的非线性处理器和舒适噪声产生器等构成。

An use of signal tone in the telephone network and statistical characteristic analysis of voice interference with the tone

电话网中信号音的利用及话音对其干扰的统计特性分析