Introduction to Dsp Processor Implementation Of A Modem For Narrow Bandwidth Channel Project:
The networks which we use for transmission are public switching telephone networks and they transmit only analog data. A modem is device which can modulate and demodulate a signal and allows the transmission and reception of data over public switched telephone networks. The modem converts the analog input stream into digital data on public switched telephone network. In this paper we will look into voice based modem system for transmission and reception of data between two computers.
Brief on modems:
The first modem designed would allow a stream of data a converts it into a tone and transmits it and at it gets converted into digital data at the receiver. The first modem has a baund rate of 300 bits per second and they were not available at a affordable rate and today electronic modems are available which have a baund rate of 9600 and available a cheaper cost. We have two types of modem configurations one is symmetric modem configuration in which there will be symmetry between the upstream and the downstream conversion of data.
Whereas in asymmetric modem configuration there will be a need of analog to digital and digital to analog conversions each time when the signal is sent over the public switched telephone network. In the voice based modem system we will use a DSP acquit ion system for performing the coding and sampling of the signal. Analog to digital and digital to analog converters are used for conversion of the data at the modems. In this we will use BPSK modulation technique for transmission of the data.
Today’s modems are available at cheaper costs and they are efficient for performing the conversion process in the public switched telephone networks. This is the best device for conversion of analog to digital data we can transmit data at a higher speeds.
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