Highpass filtering of a sinusoidal sequence:

Highpass filtering of an Audio object:

Highpass filtering of an image:

Reduce the zero-frequency component in a periodic sequence:

Use HighpassFilter to make an Audio object sound "thinner":

On a modern 88-key piano, key 55 (note C₅) has a fundamental frequency of approximately 523 Hz. Use HighpassFilter to effectively remove the fundamental and retain all the harmonics of this key in the following audio clip:

Use a highpass filter of length 59 with a cutoff frequency midway between the fundamental (523 Hz) and its first harmonic at 1046 Hz:

Compare the frequency spectra of the two audio clips:

Using a cutoff frequency of 0 returns the original sequence:

Using cutoff frequency of π or greater returns a zero sequence:

Create a highpass filter using LeastSquaresFilterKernel and HammingWindow:

Compare with the result of HighpassFilter:

Impulse response of a half-band highpass filter of length 21:

Magnitude spectrum of the filter:

Impulse response of a half-band highpass filter of length 21 without a smoothing window:

Magnitude spectrum of the filter:

Impulse response of an even-length filter:

Magnitude spectrum of the filter:

The frequency discrimination of a highpass filter improves as the length of the filter is increased:

The length of the impulse response increases as the bandwidth of the filter is decreased:

Using PaddingNone will result in an output that is shorter in length than the input:

Using kernels longer than the input will result in an empty list: