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Group delay response of discrete-time filter System object

`[`

returns the group delay `gd`

,`w`

]
= grpdelay(`sysobj`

)`gd`

of the filter System object™, `sysobj`

, based on the current filter
coefficients. The vector `w`

contains the frequencies (in radians)
at which the group delay is evaluated. The group delay is defined as:

$$-\frac{d}{dw}(angle(w))$$

The group delay is evaluated at 8192 points equally spaced around the upper half of the unit circle.