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How does the autocalibration sound mask work?

The HDL300 Audio Conferencing System includes a powerful, autocalibration process that runs continuously in the background. No user action is required to start or maintain the autocalibration process and the system remains usable during auto-calibration.

Autocalibration of the HDL300 Audio Conferencing System works by outputting a low-level signal that mimics “Pink Noise.” Using advanced digital signal processing, reflections of this signal are picked up by the system to adapt to changes (such as the number of people or the configuration of furniture) in the room. The HDL300 only takes a few minutes to gather sufficient calibration data for significant room changes and continues to fine-tune the system over time. The autocalibration signal is an extremely quiet signal resembling a “hissing” sound coming from the speakers and is always present when the unit is powered.

Although not its primary function, the autocalibration signal may also act as a sound mask to hide distant speech and noises outside the meeting area that could interfere with the desired conversation.

There may be a perceived difference in loudness of the autocalibration signal from room to room depending on room background noise or size. A smaller room with lower background noise may cause the autocalibration signal to be perceived as louder or more prevalent.

As HDL300 algorithms continually improve over time, firmware updates have lowered the loudness the autocalibration signal. For optimum system operation, ensure your HDL300 Audio Conferencing System has the latest firmware. Version 1.8 of the firmware lowered the autocalibration signal by 2.5dB, and Version 2.1 of the firmware further reduces the level by an additional 3.0dB.

Last updated: March 8, 2019

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