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Application Notes

Designing an Audioprocessor for Automobiles With the TMS320C50 DSP


This application report describes an audioprocessor designed to create an artificial sense of space that improves the listening quality of music in an automobile. This is achieved by constructing four different signals from two stereo channels. The signals are delayed in a time domain that will add echo normally missing in a car. It is not the purpose of this project to restore the original sense of space but to create a new sense of space independent of the limitations of the actual room. The equipment described in this report is designed mainly for research and development work using the Texas Instruments (TI)(tm)) TMS320C50 digital signal processor (DSP). This can be seen in its I/O functions and adapters designed to expand the system. However, it is also usable in practical applications. The power supply is 12 V, from which 5 V is reserved for components. The equipment can be switched on by an external control signal from the control adapter of the amplifier in the car radio. This document was an entry in the 1995 DSP Solutions Challenge, an annual contest organized by TI to encourage students from around the world to find innovative ways to use DSPs. For more information on the TI DSP Challenge, see TI's World Wide Web site at *DISCLAIMER: This document was part of the DSP Solution Challenge 1995 European Team Papers. It may have been written by someone whose native language is not English. TI assumes no liability for the quality of writing and/or the accuracy of the information contained herein.