Summary

This article introduces the fundamentals of digital interpolation and resampling, explaining the goal of increasing sample rate so interpolated samples approximate the continuous-time signal. It includes a step-by-step numerical example that demonstrates upsampling by an integer factor and the practical considerations (timing, sample spacing, and filtering) needed to produce a smooth interpolated signal.

Key Takeaways

• Explain the concept of interpolation and how it differs from signal reconstruction and simple sampling
• Demonstrate how to perform integer-factor upsampling (e.g., factor-of-4) and compute new sample times
• Apply a numerical example to generate interpolated samples and visualize the result relative to the continuous signal
• Choose and understand the role of lowpass/anti-imaging filtering to remove spectral images introduced by upsampling

Who Should Read This

Early-career DSP engineers, signal-processing students, and practitioners in audio, communications, or radar who need a clear, practical introduction to interpolation and resampling.

TimelessBeginner

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