Model C960 Headset Intercom System OperationandDiagrams
1-3E 3M 2000 May
Theheadset receivesmicrophoneaudiosignalsfrom
the base station on frequency B and transmits both
audiosignalsand control tones on frequencyA. The
control tones are above the audible range, and
functiontoturnthebasestationreceiverONtoenable
reception of the audio signal from the headset
microphone. Becausethecontroltonesare abovethe
audible range, audible tones from devices such as
telephones, pagers, and radios will not interfere.
The base station transmits on frequency B and
receives on frequency A. The receiver in the base
station operates above the audible frequency range.
While it receives the high-frequency control tones
from the headset, it is not affected by audible tones
from devices such as telephones, pages, andradios.
The transmitter in the base station is always
transmitting a “no signal” transmitter carrier, even
when there is no microphone audio from the menu
sign or headset operator being broadcast. This “no
signal“carrieriscontinuallybroadcasttoandreceived
by all headset receivers. Itserves toblock outother
radio-frequency signals or noises from headset
receivers.
Similarly,theheadsetreceiverisalwaysON toenable
the listen mode. The headset transmitter turns ON
only when a talk or page switch is pressed.
Instandardcommunication systems,theoutputfrom
the headset receiver is muted when the headset
transmitter is ON. This provides standard
communication (talk or listen).
In duplex communication systems, the output from
theheadsetreceiver isenabled(notmuted) when the
headset transmitter is ON. This provides duplex
communication (simultaneous talk and listen).
The two sets of transmitters and receivers work
togethertoprovideaudiocommunicationbetweenthe
customeratthe menu sign andthe headsetoperators
insidethedrive-throughrestaurantorbetweentwoor
more headset operators.
All audio transmitted by a headset during talk
operation is heard by:
S Menu sign customers.
S Personnel wearing active headsets.
S People near the optional monitor speaker.
All audio from the menu sign is heard by:
S Personnel wearingheadsets that are operatingin
the talk/listen mode.
S People near the optional monitor speaker.
Talk/Listen Communication
Headset to Menu Sign
After the vehicle detection signal is presented tothe
base station, the base station broadcasts a repeating
alert tone to all active headsets.
Theheadsetoperatorpressesandholdsthetalkbutton
to acknowledge the customer at the menu sign and
cancel the alert tone. When the headset operator
speaks into the microphone, theheadset generates a
talkcontroltoneand addsittothemicrophoneaudio.
Themicrophoneaudio andtalkcontroltone arethen
transmittedto thebase station. Thetalk controltone
turns the base station receiver ON , enabling it to
receive the microphone audio.
n Note
The talk control tone is above the audible
frequency range, and is used to prevent the base
station receiver from receivingsignals fromother
devices(telephones,pagers, etc.)thatmightbe on
the same frequency.
Whenthebasestationreceivesthe microphoneaudio
signal, it re-transmits it to all headset receivers. The
same microphone audio signal is also routed to the
menu speaker amplifier and the monitor speaker
amplifier.
The menu speaker amplifier routes the amplified
microphoneaudiothrough wiretothe menuspeaker
where it can beheard bythe customer. The monitor
speaker amplifier routes the amplified microphone
audio through wire to an optional monitor speaker
(typicallylocatedin thekitchenarea)where itcanbe
heard by anyone in close proximity to the speaker.
n Note
The menu sign audiois not turned ON unlessthe
base station receives a talk control tone from the
headset. However, the the monitor amplifier is
always turned ON.
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