51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

Tuesday, October 14th, 2008 at 18:40 | No comments

Categories: Communication Networks

Tags: PSTN

Short Content:   Abstract: This article introduced one kind take the monolithic integrated circuit AT89C51 primarily controller and double sound multi-frequency demoding circuit chip MT8880 as a core, realizes through the telephone channel to domestic electric appliances' long-distance multi-channel intelligent control system. This system is practical, function nimble diverse, may to carry on by the remotely controlled object condition the inquiry as well as the control, may widely apply in the domestic electric appliances or other place each kind of control device.  Key word: ...

Tuesday, October 7th, 2008 at 12:54 | No comments

Categories: Communication Networks

Tags: PSTN

Short Content:    Abstract: Introduced that one kind (Public Switch Telecommunication Network) as the transmission medium residential district seeks help urgently take public telephone network PSTN the system. The system take the monolithic integrated circuit as a core, (DTMF, Dual Tone Multiple Frequency) takes the mailing address by the double sound multi-frequencies. This system the inhabitant provides for the plot in seeks help urgently the service, has the reliability to be high, the cost low, easy to popularize and so on merits. ...