telephone circuit

The Optimum Computing for Circuit Numbers of Trunk Circuit Network in a Local Telephone Network

市话网中继电路网电路数的优化计算

Principle Analysis and Fault Estimation of Double Audio Frequency Telephone set's Dialing Integrate Circuit

电话机双音频拨号集成电路原理及故障判断方法

We design the special interface circuit between the message accounting device and the telephone wire.

自己设计了电话计费器与电话线的独特接口电路.

Hotel service functions, equipped with international direct dial telephone, circuit television, business center, exchange, laundry room.

宾馆服务功能齐全, 内设国际直拔电话, 闭路电视, 商务中心 、 外汇兑换处 、 洗衣房.

The article analyses the connection mode of dispatching telephone circuit in common use, points out the existent problems caused by this mode, and through the theoretic analysis tries to reduce part circuit of this connection mode to build a new type connection mode of dispatching telephone circuit.

对目前的调度电话电路的连接方式进行了分析，指出改电路方式存在的问题，通过理论分析，试图减少其中的部分电路环节，构建出一种新型调度电路连接方式。

New type connection mode of dispatching telephone circuit

一种新型调度电路连接方式

Also interference with telephone circuit is reduced because of the absence of zero-sequence currents .

由于无 零序电流,对电话线路干扰的影响也降低.

In this paper, the designing method and work theory of IP telephone are introduced especially. At the same time the circuit diagram and main program design frame are presented.

文中着重介绍了IP电话的实现方法和低功耗电路设计思想，给出了IP电话机的整体框图和部分电路图以及主程序设计框图。

Wireless Telephone Remote-Control Circuit Design Based on STC SCM

基于STC12C5412AD单片机的无线电话遥控电路设计

Based on the analysis of the application of VoIP, a design of IP telephone terminal card is introduced. The circuit and the soft program are described in detail, part simulation is provided as well.

在对VoIP应用要求进行分析的基础上，介绍了一种IP电话终端卡的软硬件设计方案，详细介绍了硬件电路与软件编程方法，并作了局部仿真试验。

This paper describes an important part of subscriber line interface circuit in digital telephone switching systems the new generation Codec based on DSP ( Digital Signal Processing) and ΣΔ modulation technologies.

介绍了数字电话系统中用户线接口电路的一个重要电路&基于数字信号处理（dsp）和∑Δ调制技术的新一代编解码器（codec）。