The Design Of Hospital Nursing And Calling System Of DTMF

The calling system for nursing in hospital, which can promote the hospital's image, strengthen the management of organization, and guarantee to provide good service, is an important part in an advanced hospital. At present, people usually apply the Pulse Code Wired transmission in this system. As a result, the profile which system produces can be distorted easily, and it is also unstable. Minority uses the wireless technology, whose problem is that the signal can be easily influenced by the outside, which caused a mistake in system. Besides, the cost of the system is high. So, both of them have their advantages and their disadvantages. But in the system based on DTMF, their advantages are compatible and their disadvantages are overcome.This paper studied the DTMF basic principle, DTMF occurrence machine function and realizes the technique thoroughly, analysis and compares current the nursing of four kinds of different types calling system in common, and set up the structure of a kind of hospital nursing calls system that based on the DTMF and completed the system hard, software development and design the work. The system makes sure that it has the capacity of transmitting the data in long distance, and avoids the wire system transmission instability by the coding, the transmitting and the decoding technology. The system takes the single chip microcomputer AT89C52 as a core, and it achieves the function such as single calling, group calling, displaying, inquiry, broadcasting, the set-up and the deletion about the nurse rank through the peripheral electric circuit such as the voice signal transmitting chip, the voice signal receiving chip, the voice broadcasting chip, light emitter diode, digital tube displaying.The kind machine of this text development has circulated to verify its usefulness through experiment with practical value, and has thrown in the small batch quantity tries the production, having good expansion application foreground.