Response

Advancing a causal IIR filter's impulse response

Advancing a causal IIR filter's impulse response
  1. Can IIR filters be causal?
  2. What is impulse response in filters?
  3. Why impulse invariance method can not be used for high pass and band reject filter?
  4. What is frequency response of IIR filter?

Can IIR filters be causal?

(v) An IIR filter is linear and time-invariant. (vi) It is causal.

What is impulse response in filters?

The impulse response (that is, the output in response to a Kronecker delta input) of an Nth-order discrete-time FIR filter lasts exactly. samples (from first nonzero element through last nonzero element) before it then settles to zero. FIR filters can be discrete-time or continuous-time, and digital or analog.

Why impulse invariance method can not be used for high pass and band reject filter?

The impulse invariance method is inappropriate for designing high-pass filters or stop-band filters due to spectrum aliasing that results from the sampling process.

What is frequency response of IIR filter?

Infinite impulse response (IIR) filters are based on analog filters, where the frequency response is defined by both poles and zeros. Finite impulse response filters, in contrast, only have zeros. The presence of poles in the IIR filter causes the impulse response to be infinitely long.

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