What type of digital signal processing filter is used to generate an SSB signal?

In digital signal processing (DSP), a Hilbert-transform filter is used to shift the phase of a signal by exactly 90 degrees (quadrature) across a wide range of frequencies. This mathematical phase shift is a crucial step in the phasing method of Single Sideband (SSB) generation. By generating two signals that are 90 degrees out of phase (using the Hilbert transform) and mixing them with a pair of quadrature local oscillator signals, the resulting outputs can be added or subtracted to cancel out one sideband completely. Distractors like notch filters are used to remove a specific narrow band of frequencies, while adaptive filters automatically adjust to changing signal conditions (like noise reduction). Neither is used for the broadband 90-degree phase shifting required to generate SSB.