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© Cambridge Silicon Radio Limited 2005
This material is subject to CSR’s non-disclosure agreement.
Page 19 of 24
_äìÉi~Ä»=îPKO=Combined AV Headset User Guide=
7.3.2 HFP + AV
Table 7.2 shows how the buttons operate while the headset is in HFP Mode. It shows how the buttons operate
depending on the state of the headset.
Table entries in italic describe the button functionality assuming an active AV stream.
Button/State Init Ready Connecting Connected
Incoming
Call
Active
Call
Outgoing
Call
If there is no AV source connected replace avrcp calls with the non-italic calls
PLAY/PAUSE
Short Press
Play/Pause
X
Play/Pause
X
Play/Pause
X
Play/Pause
X
Answer
Call
Transfer
Audio
X
PLAY/PAUSE
Long Press
X X X
Voice
Recog.
Enable
Answer
Call
Transfer
Audio
X
STOP Short
Press
Stop
X
Stop
X
Stop
X
Stop
X
Reject Call
Hang up
Call
Hang up
Call
STOP Long
Press
X
Last
number
redial
X
Last
number
redial
Reject Call
Hang up
Call
Hang up
Call
Vol+ Short
Press
Volume up
X
Volume up
X
Volume up
X
Volume up
Volume up
Volume up Volume up Volume up
Vol+ Held
(Acted on
every 1s)
Volume up
X
Volume up
X
Volume up
X
Volume up
Volume up
Volume up Volume up Volume up
Vol- Short
Press
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Vol- Held
(Acted on
every 1s)
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Volume
down
Forward
(Long/Short)
Press
Forward
X
Forward
X
Forward
X
Forward
X
X X X
Backward
(Long/Short)
Press
Backward
X
Backward
X
Backward
X
Backward
X
X
x
CVC
Mode*
X
Table 7.2: Button Functionality in HFP Mode
CVC Mode* If CVC is compiled in the application, with each short button press the software toggles between
HF, NR and PSTHRGH modes. This button is only operational if a connection exists and the
device is not muted. When operational and the Backward button is pressed, the next mode will
be selected and a tone will be played to the loudspeaker. The tone will identify the currently
operating mode. The following indicates the tone mapping.
1 Beep, HF mode: Hands-Free is the combination of an AEC (Acoustic Echo Canceller with
microphone Noise Reduction). Default mode for CVC.
2 Beeps, NR mode: Noise Reduction to the microphone send-out signal.
3 Beeps, PSTHRGH mode: Pass through mode where the audio is routed through the Kalimba, disabling
Hands-free, effectively bypassing any audio processing.