In severe cases, the low-frequency noises that can result from microphone handling, wind buffeting and other disturbances can impede the performance of the DNS algorithm. The high-pass filters within the DNS 2 (which should have minimal or no effect upon the wanted speech) have therefore been added to remove this noise before presenting the audio to the DNS process. These filters were added in firmware v1.3, which is compatible with all DNS 2 units. If you have an early unit and wish to upgrade, please contact support@cedaraudio.com. If not already registered, it will be necessary to register the unit beforehand here: Product registration page.
In severe cases, the low-frequency noises that can result from microphone handling, wind buffeting and other disturbances can impede the performance of the DNS algorithm. The high-pass filters within the DNS 2 (which should have minimal or no effect upon the wanted speech) have therefore been added to remove this noise before presenting the audio to the DNS process.
These filters were added in firmware v1.3, which is compatible with all DNS 2 units. If you have an early unit and wish to upgrade, please contact support@cedaraudio.com. If not already registered, it will be necessary to register the unit beforehand here: Product registration page.
The DNS2 saves its settings automatically at the moment the screens and buttons drop to low brightness, which happens after approximately 20 seconds of front panel 'idle' time. Firmware versions 1.3 onward also save the settings when the power button is pressed to initiate a shutdown. To ensure that your most recent settings are saved on shutdown on earlier versions, leave a gap of 20 seconds or more between adjusting a DNS 2 control and switching it off.
The DNS2 saves its settings automatically at the moment the screens and buttons drop to low brightness, which happens after approximately 20 seconds of front panel 'idle' time. Firmware versions 1.3 onward also save the settings when the power button is pressed to initiate a shutdown.
To ensure that your most recent settings are saved on shutdown on earlier versions, leave a gap of 20 seconds or more between adjusting a DNS 2 control and switching it off.
What is the difference between the DNS 2 and the FNR process on CEDAR Cambridge? CEDAR's FNR and DNS 2 processes are both based upon advances over our original DNS (dialogue noise suppression) technology. However, they are different algorithms optimised for two rather different requirements, although both offer significant improvements in the filtering architecture and both are capable of updating the threshold and attenuation profiles based upon the audio content rather than requiring the users to set them using knobs or sliders. The algorithm in the DNS 2 is aimed at the reduction of noise in the presence of wanted speech for broadcast and live sound applications. It is optimised for sound quality and, as it is intended for use in the field, it offers zero latency and has very simple controls that are quick to set up and have wide 'sweet spots'. FNR, which is primarily used for audio forensic applications, is targeted at the reduction of noise where the noise levels are often much louder than is encountered in typical broadcast and live sound situations. It is optimised for intelligibility over sound quality, and has a more powerful control set that provides more control over the algorithm. Therefore, a certain amount of time and expertise is required to get the best results from it. While low latency and wide sweet spots remain important, they are less critical than in the DNS 2. FNR is also a lot more computationally expensive (power hungry) than the DNS 2 algorithm. How can I use the DNS 2 as a fully automatic device, like my DNS 8 Live when LEARN is switched on? The DNS 2 can be used like a DNS 8 Live by following these steps: Switch on the DNS 2 Switch on LEARN Decide how much noise reduction (attenuation) you want; a figure of around -4dB will emulate the DNS 8 Live Lock the front panel using the switch on the side of the unit These settings will be remembered when you switch off the DNS 2 and later switch it on again. Note that, although the DNS 2 does not have the screens that illustrate how the amount of noise reduction is changing as the signal changes, it is still performing this task in the background. Back to DNS 2 Overview
CEDAR's FNR and DNS 2 processes are both based upon advances over our original DNS (dialogue noise suppression) technology. However, they are different algorithms optimised for two rather different requirements, although both offer significant improvements in the filtering architecture and both are capable of updating the threshold and attenuation profiles based upon the audio content rather than requiring the users to set them using knobs or sliders. The algorithm in the DNS 2 is aimed at the reduction of noise in the presence of wanted speech for broadcast and live sound applications. It is optimised for sound quality and, as it is intended for use in the field, it offers zero latency and has very simple controls that are quick to set up and have wide 'sweet spots'. FNR, which is primarily used for audio forensic applications, is targeted at the reduction of noise where the noise levels are often much louder than is encountered in typical broadcast and live sound situations. It is optimised for intelligibility over sound quality, and has a more powerful control set that provides more control over the algorithm. Therefore, a certain amount of time and expertise is required to get the best results from it. While low latency and wide sweet spots remain important, they are less critical than in the DNS 2. FNR is also a lot more computationally expensive (power hungry) than the DNS 2 algorithm.
CEDAR's FNR and DNS 2 processes are both based upon advances over our original DNS (dialogue noise suppression) technology. However, they are different algorithms optimised for two rather different requirements, although both offer significant improvements in the filtering architecture and both are capable of updating the threshold and attenuation profiles based upon the audio content rather than requiring the users to set them using knobs or sliders.
The DNS 2 can be used like a DNS 8 Live by following these steps: Switch on the DNS 2 Switch on LEARN Decide how much noise reduction (attenuation) you want; a figure of around -4dB will emulate the DNS 8 Live Lock the front panel using the switch on the side of the unit These settings will be remembered when you switch off the DNS 2 and later switch it on again. Note that, although the DNS 2 does not have the screens that illustrate how the amount of noise reduction is changing as the signal changes, it is still performing this task in the background. Back to DNS 2 Overview
The DNS 2 can be used like a DNS 8 Live by following these steps:
These settings will be remembered when you switch off the DNS 2 and later switch it on again.
Note that, although the DNS 2 does not have the screens that illustrate how the amount of noise reduction is changing as the signal changes, it is still performing this task in the background.
Back to DNS 2 Overview