HM Electronics EOS HD - Audio Processing Functions; VAA (Variable Audio Attenuation); ANC (Automatic Noise Cancellation); AVC (Automatic Volume Control)

AUDIO PROCESSING FUNCTIONS
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6. AUDIO PROCESSING FUNCTIONS
The EOS/HD Base Station has several advanced audio processing features designed to improve the
quality of communication with the customer at the menu. Below are brief explanations of how each
feature works:
6.1 VAA (Variable Audio Attenuation)
Variable Audio Attenuation (VAA) is designed to reduce the volume of the customer’s voice or other
loud noises in your headset. If a customer is speaking loudly, speaking while you’re speaking or other
loud noises occur, it may become confusing. The VAA option assures that as you speak, the sound from
outside is reduced. See Section 5.7.7 - VAA Settings, pg. 80.
6.2 ANC (Automatic Noise Cancellation)
Automatic Noise Cancellation (ANC) is designed to reduce the level of outside sounds when the
customer is not speaking.
For example, a customer starts to place an order and then pauses to think. Within a moment, the
volume level from outside drops and becomes quiet. Birds, cars driving by, engine noise and other non-
customer sounds are reduced. When the customer begins speaking, the volume returns to a normal
level. This feature is benecial for reducing order taker listening fatigue and improving the overall order
process. See Section 5.2.5, pg. 31.
6.3 AVC (Automatic Volume Control)
Automatic Volume Control (AVC) automatically reduces the volume level coming from the outside
speaker during quiet times, such as in the early morning or late at night. AVC monitors the ambient
sound level outside and adjusts speaker’s volume level. If the ambient outside sound level increases,
AVC stops adjusting and returns volume to its original level. Section 5.7.7 - AVC Settings, pg. 81.
6.4 Echo Cancel
In situations where microphones and speakers are in close proximity to one another, sound from the
Speaker can sometimes be picked up by the microphone, creating a loop that causes feedback in the
headset. Echo Cancel recognizes the sound from the Speaker and prevents it from looping through the
Microphone. See Section 5.2.5, pg. 31.
6.5 Inbound Noise Cancel
Inbound Noise Cancel greatly enhances the Order Taker experience by virtually eliminating all
unwanted outside noise (such as a car engine) that may normally be picked up by a microphone.
Inbound Noise Cancel distinguishes human voice from ambient noise and lters the audio, making the
customer’s voice much more clear. Other outside sounds such as planes ying over, sprinklers or street
noise are also ltered. See Section 5.2.5, pg. 31.
6.6 Outbound Noise Cancel
Outbound Noise Cancel virtually eliminates all in-store noise from being heard through the outside
speaker. A quick service restaurant can produce sounds caused by machines necessary for the
operation of the store. These sounds can sometimes be picked up by the headset’s microphone and
potentially heard by the customer. Outbound Noise Cancel distinguishes human voice from in-store
noise, ltering the audio so that only the Order Taker’s voice is heard loud and clear by the customer.