Improving DSP-based measurements with spectral interpolation

Spectral interpolation is a simple mathematical process that removes certain types of non-coherent interference from coherent DSP-based measurements. A common example of non-coherent interference is exponential decay resulting from inadequate settling time in an AC-coupled measurement. Asynchronous 60 Hz power hum is another common example familiar to test and measurement professionals. Either type of interference can cause significant accuracy and repeatability problems in DSP-based measurements. Spectral interpolation removes most of the unwanted interference, reducing the need for expensive settling time.