CEDAR DNS 8D
CEDAR’s Dialogue Noise Suppression technology is the standard for removing background noise from dialogue in studios. With near-zero latency, high-resolution processing, and a fast, intuitive user interface, it eliminates traffic noise, air conditioning, wind, rain, babble and general background noise from audio signals. It will also help to compensate for unfavourable acoustic conditions and poor microphone placement, and will even suppress excessive reverberation.
The CEDAR DNS-8D has been designed specifically for broadcast and live sound. With eight channels of noise suppression, it hosts a new algorithm that marries the best of the machine learning and signal processing on which the DNS 8 Live and the DNS 2 dialogue noise suppressors are based. With its slick user-interface that includes standard and detailed modes of operation it offers better control than any previous dialogue noise suppressor, both from the front panel and from almost any web browser that can access its internal remote control software. With its near-zero latency and standard 4-pin 12VDC input in addition to universal mains power, it’s suitable for use in all live situations – not just broadcasting, but also live sound in venues such as theatres, concert halls, conferences venues, and places of worship.
Dante® is the de-facto standard for media networking, distributing uncompressed, multi-channel digital audio via standard Ethernet networks with near-zero latency and perfect synchronisation. The CEDAR DNS-8D is the first DNS with a Dante interface in addition to its AES3 audio connections (DB25 using the AES59 pin-out). With fail-safe AES3 audio bypass implemented in the form of hardware relays that immediately connect the inputs to the outputs in the event of a power failure or other significant disruption plus support for Dante’s redundant mode of operation which helps to protect against network failure, it can be installed with confidence in critical paths anywhere within the audio chain.
Other CEDAR products
Noise is all around us: traffic, aircraft, the noise inside vehicles, air conditioning, wind, rain and other water noises, the noise from domestic appliances and even excessive reverberation. It annoys people, and it can render many recordings unusable. So noise suppression techniques are used to clean up noisy dialogue for film production, suppress ambient noise for live TV and radio broadcasting, revitalise sound effects libraries, and enhance speech for forensic audio investigations.
Until CEDAR’s Academy Award winning DNS technology, you were forced to use processes such as low-pass and other filters, noise gates, dynamics processes, or processes developed from analogue encode/decode noise reduction systems. These often proved inadequate. Filtering is not selective about what it removes, and there is no relationship between the input and the filtering effect. Gates have no effect when the desired signal is present and lead to unnatural gaps in the signal. Other dynamics processes generate pumping, distortion and other unnatural effects, and encode/decode processes when used in this way simply act as dynamics processors. Even the digital noise reduction methods used in most dehissers and other broadband noise reduction systems are inadequate, generating unpleasant artefacts (known variously as ‘twittering’ and ‘glugging’) that can render the audio unusable.
Furthermore, other digital noise reduction systems add a significant delay to the audio making real-time use impossible where lip-sync is an issue. In contrast, the audio delay through any of CEDAR’s DNS products is less than 10 samples (0.2ms at 48kHz) which is far too short for any issues of this nature.
The original CEDAR DNS process overcame all of these problems and resulted in a string of awards when implemented in our hardware (the DNS1000 and its descendents) and software products (DNS One and its siblings). Today, a further development of the DNS algorithm is designed specifically for broadcast and live sound applications and this forms the core of the DNS 8D.