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Static Switching Rectangle (SSR) is a common issue found in audio systems, particularly when processing signals with lofty content of dither.
Harmonic distortion is a major contributor to the degradation of audio quality, and mitigating it is crucial to achieve clean and clear sound.

Harmonic distortion occurs when the signal is forced through a system with a non-linear response, resulting in frequencies not present in the original signal being introduced.
These added frequencies can greatly reduce the overall audio quality and noise level.
One approach to mitigate this problem is by using a method called frequency rejection filtering.

Harmonic distortion cancellation is based on a mathematical approach developed by Richard Goldman and Thomas Wüthrich in the 1930s.
The basic idea is to subtract a set of harmonics, calculated based on the signal being processed, from the original signal.
The result is a residual that typically contains mostly interference not related to the original signal content.

To achieve effective harmonic distortion cancellation, there are several key considerations.
The first is that a lot more of the even harmonics must be cancelled than the even harmonics to ensure that even harmonic content i.e., 4th harmonic, اس اس آر does not raise to audible levels.

The second involves choosing a wideband filter that is as flat as possible and using threshold detection to adjust circuit parameters to include as much of the high frequency spectrum possible.
This is more likely to effectively reduce distortion produced by "non-periodic" background noise.

However, the process of removing the fundamental frequency from a signal along with its associated components is a highly difficult one, mainly due to issues with performance of operation frequency.

Fortunately, in the past several years there may have been solid research conducted in this area specifically regarding how to effectively nullify audio imperfections such as these caused by harmonic distortion within different environments that host sound waves having the highest frequencies and the highest frequencies that exist.