Phase function of filter

1. What is the phase of a filter?
2. How does phase affect a filter?
3. How do you find the phase of a filter?
4. What is the function of filters?

What is the phase of a filter?

There are three types of phase response that a filter can have: zero phase, linear phase, and nonlinear phase. An example of each of these is shown in Figure 19-7. As shown in (a), the zero phase filter is characterized by an impulse response that is symmetrical around sample zero.

How does phase affect a filter?

Filters, however, also induce changes in the phases of different frequencies whose amplitude is unmodulated. These phase shifts cause time lags in the filtered signals, leading to a disruption of the timing information between different frequencies within the same signal and between different signals.

How do you find the phase of a filter?

If you can factor your LTI filter's equation into the ratio of zeros over poles, then you can calculate phase very simply (even graphically) by adding up the angles from every pole and subtracting the angles from every zero to points on the unit circle in the complex plane representing frequency.

What is the function of filters?

A filter is a circuit whose transfer function, that is the ratio of its output to its input, depends upon frequency. There are three broad categories of filter which are widely used: Low-pass filters allow any input at a frequency below a characteristic frequency to pass to its output unattenuated or even amplified.