CAM26: DNS Two

A new world standard for background noise suppression

CAM(xx): DNS Two

Noise suppression is needed to clean up noisy dialogue for film production, to suppress ambient noise for live TV and radio broadcasting, to revitalise sound effects libraries, and to enhance speech for forensic audio investigations. Until recently, this meant using conventional filters, noise gates, dynamics processes, or processes developed from analogue encode/decode noise reduction systems. But these proved to be inadequate, so we developed the Academy Award winning DNS process to remove the rumble, the hiss, the whistles, the broadband noise and the shot noise from contaminated sounds. DNS splits the signal into a large number of well-defined bands, and sophisticated digital filters then analyse each of these, suppressing the noise independently in each.

The simplest and most effective DNS ever developed...

A huge success within the DNS 2™ hardware unit, the newly developed algorithm in DNS Two has already proved to be the quickest, simplest and most effective dialogue noise suppressor ever developed. In almost all cases, using DNS Two is as simple as switching on LEARN (which allows the algorithm to calculate and adapt to the changing noise contained within the signal and determine suitable noise reduction parameters) and then adjusting the attenuation to obtain the desired amount of noise reduction.

LEARN is not a noise fingerprint and you do not need to find a section of the audio that contains little or no wanted signal to take a noise measurement. Yes, you can use it to take a snapshot of existing conditions and then fine-tune the parameters, but its real power lies in leaving it switched on so that it can adapt to changes in the background and surroundings. It not only adapts in a fraction of a second to changes, it differentiates between the wanted signal and the noise so that you obtain superb noise suppression at all times.


If you work with film dialogue, the speed, flexibility, and ease of use of DNS Two provides solutions to audio problems that you could not previously solve. And, with eight, 96kHz channels of the latest DNS algorithm in a convenient, automated format, it cannot be bettered for multi-channel post-production in the film, video, and TV industries. Elsewhere, in the audio forensic laboratory, DNS Two is ideal for removing motor noise from small covert recorders, for eliminating electrical interference, and for helping to clean up recordings suffering from unfavourable acoustics and poor microphone locations.

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