Resumen

CASTELLANOS RODRIGUEZ, Alexis et al. Electronic system design based upon XBee modules for transmitting voice signals.. EAC [online]. 2015, vol.36, n.2, pp. 40-52. ISSN 1815-5928.

The current paper addresses the design of an electronic system using XBee modules to transmit voice. These modules operate on the IEEE 802.15.4 wireless standard, which is not originally intended to transmit voice. A configurable model is presented as both, a master or a terminal device. The printed circuit board supporting this application and operation is discussed. A terminal equipment is programmed through the use of a protocol, this specifically designed for acquiring, digitizing, compressing and packing the voice signal using a microcontroller. Packages are delivered via serial communication to an XBee module that allows wireless communication with other XBee module located in the master device. The master device performs the function of managing receiver in order to reconstruct the voice signal. Moreover, the structure of the various commands is shown. These commands are used for implement the communication protocol and allow to monitor the terminal devices by the master device. Finally, the results are obtained using two complementary models and the distortion of the received signal is analyzed.

Palabras clave : XBee; microcontroller C8051F320; ADPCM.

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