User`s manual

Figure 4-6: Channel Swap Feature Indication

4.2.3: Input and Output Highpass Filters (HPFs)

Application:

The Input HPFs are used to remove rumble or other low-frequency noises which occur below

100 Hz to 500 Hz (adjustable) from the input signals before they enter the digital processors.

Since very little speech information is lost in bandlimiting below these frequencies, this filter

is recommended for voice enhancement. However, for wide bandwidth and hifi signals, the

low-frequency cutoff may result in some loss of desired signal components.

The Output HPFs function the same as the Input HPFs, except that they remove low-

frequency noise after the input signal has passed through the digital processors. (Signal

processing may restore some of the low-frequency energy.)

Clicking on the Active button within the Input HPF block will cause its RED LED to toggle between

illuminated and not illuminated as shown in Figure 4-7; this indicates whether the Input HPFs are in

(RED) or out (GRAY) of the process. Similarly, clicking on the Active button within the Output

HPF block will toggle the Output HPFs in and out of the process.

Figure 4-7 Input/Output HPF Active Button