Effects of linear interpolation of a time series on its frequency spectrum

1. What is the effect of interpolation on filter design?
2. What is interpolation in time domain?
3. What is FFT interpolation?
4. What is linear interpolation in DSP?

What is the effect of interpolation on filter design?

The interpolation filter then uses the lowpass FIR filter H(z) to remove the images. Therefore, this lowpass FIR filter is an anti-imaging filter. The interpolation filter then returns an output signal y(n) with the new sampling frequency.

What is interpolation in time domain?

Interpolation by digital computer provides an alternative to the phase-locked frequency multiplier for the calculation of the time domain average of gear vibration signals. Higher-order interpolation techniques produce flatter passbands and lower sidelobes in the stopband but require longer calculation times.

What is FFT interpolation?

FFT interpolation is based on adding zeros at higher frequencies of the Fourier coefficient vector. In such way, the inverse FFT will produce more output, using the same non-zero Fourier coefficients.

What is linear interpolation in DSP?

Linear interpolation works by effectively drawing a straight line between two neighboring samples and returning the appropriate point along that line.