Interpolation of filter coefficients

1. What is an interpolation filter?
2. Is interpolation a low pass filter?
3. Is interpolation and upsampling same?
4. What is an interpolation function in DSP?

What is an interpolation filter?

The interpolation filter contains an L-fold expander followed by a lowpass FIR filter H(z). The L-fold expander inserts L−1 zeroes between consecutive samples to the original signal x(n) and changes the sampling frequency f_s of the original signal x(n) to a new sampling frequency Lf_s.

Is interpolation a low pass filter?

Interpolation is a two step process: upsampling followed by low pass filtering.

Is interpolation and upsampling same?

In digital signal processing, upsampling, expansion, and interpolation are terms associated with the process of resampling in a multi-rate digital signal processing system. Upsampling can be synonymous with expansion, or it can describe an entire process of expansion and filtering (interpolation).

What is an interpolation function in DSP?

In the domain of digital signal processing, the term interpolation refers to the process of converting a sampled digital signal (such as a sampled audio signal) to that of a higher sampling rate (Upsampling) using various digital filtering techniques (for example, convolution with a frequency-limited impulse signal).