sdr.Interpolator(rate: int, taps: 'kaiser' | 'linear' | 'zoh' | ArrayLike = 'kaiser', streaming: bool = False)

Creates a polyphase FIR interpolating filter.

Parameters:
rate: int

The interpolation rate \(r\).

taps: 'kaiser' | 'linear' | 'zoh' | ArrayLike = 'kaiser'

The multirate filter design specification.

  • "kaiser": The multirate filter is designed using multirate_taps() with arguments rate and 1.

  • "linear": The multirate filter is designed to linearly interpolate between samples. The filter coefficients are a length-\(2r\) linear ramp \(\frac{1}{r} [0, ..., r-1, r, r-1, ..., 1]\).

  • "zoh": The multirate filter is designed to be a zero-order hold. The filter coefficients are a length-\(r\) array of ones.

  • npt.ArrayLike: The multirate filter feedforward coefficients \(h_i\).

streaming: bool = False

Indicates whether to use streaming mode. In streaming mode, previous inputs are preserved between calls to __call__().