Explanation/Reference:
Explanation:
High Ambient Noise Levels The background noise level should be less than 36 dBA and 54 dBC for a Cisco TelePresence room. This level is an ideal threshold for background noise in most audio-video communication environments. However, sound levels are usually higher in a commercial office environment. Because of this, Cisco recommends lowering background noise to at least 45 dBA and 60 dBC. The Cisco TelePresence system will continue to operate properly with background noise at even higher levels; however, the sound quality begins to suffer. Background noise above 45 dBA begins to compete with the intelligibility of human speech, and these noises become distracting for participants. The Cisco TelePresence system may be able to filter out the background noise for participants at the other end of the call, but the in-room experience is still degraded for the local participants, who must endure a meeting in a loud environment. In extreme cases, such as when background levels exceed 55 dBA for a sustained period of time, gating or sound-suppression effects may occur in the Cisco TelePresence audio.
These effects occur when the system can no longer distinguish between background noise and speech, ultimately causing the system to suppress most sound because it identifies that sound as background noise.
The most common causes of background noise are as follows:
● Noise from HVAC air movement
● Noise from HVAC machinery or other machinery
● External sounds such as street traffic
● Adjacent room noise (server rooms, break rooms, bathrooms, or kitchens) Reference: http://www.cisco.com/c/dam/en/us/solutions/collateral/collaboration-endpoints/c07-643449-
00_tp_dg.pdf