CEDAR Cambridge INR impulse noise reduction

INR is an Impulsive Noise Reduction module that was conceived as a more powerful alternative to Declickle. Originally developed for the audio forensics community, it digs deeper into the signal to remove clicks and impulsive noise bursts that Declickle cannot and, while its primary use remains in the forensic arena, it can also be used for badly degraded commercial audio such as optical sound tracks with noisy clicks and bursts that are not recognised by other declickers.

Clicks and noise bursts

INR addresses two closely related types of impulses. It eliminates short bursts of noise (which are not impulses in the usual sense but cannot be addressed using any form of broadband noise reduction) as well as defined clicks.

Transient and harmonic modelling

If you are working with material that contains very fast, high energy transient events such as percussion and plucked sounds, INR's transient modelling protects these during processing, retaining their energy even when heavy processing is applied. Similarly, the harmonic modelling allows INR to remove clicks and bursts accurately in the presence of harmonic signals such as music and strong tones.

If you're working with badly damaged material suffering from intransigent impulse noises, you need to try INR. It will eliminate problems that nothing else can.

Removing impulse noises