Abstract
The implementation of a real-time cubic spline interpolator for audio frequency applications is presented. The interpolator is based on the parabolically blended cubic spline algorithm (Browne and Gaydecki, 1987; Rogers and Adams, 1990), and is implemented in a TMS320C25 DSP environment. Results based on both time domain data and spectral analyses are presented. These show that, for a PC data acquisition system already equipped with a DSP board, the interpolator can render the need for a hardware reconstruction filter at the output of a digital-to-analogue converter (DAC) unnecessary.
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