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Operation
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© Cambridge Silicon Radio Limited 2005
This material is subject to CSR’s non-disclosure agreement.
Page 17 of 24
_äìÉi~Ä»=îPKO=Combined AV Headset User Guide=
7 Operation
7.1 Modes of Operation
The actions performed by the buttons change dynamically, depending on the current mode of operation.
7.1.1 HFP/HSP Modes
These modes of operation are active when there is no media stream active or whenever an HSP/HFP operation
is performed while a media stream is active. These operations suspend the audio stream until the operation is
complete. At this point, the media stream continues to play.
When initiating a Service Level Connection (SLC), the application will tries to connect using the HFP profile. If the
handset does not support HFP, it tries HSP and, if that fails, the attempt to connect is aborted.
When the handset is connecting to the headset it accepts the connection for whatever profile the handset
chooses.
It should be noted the CVC (Acoustic Echo Canceller and Noise Reduction) DSP algorithm can be compiled for
inclusion into the
av_headset_hfp reference application. Refer to section 5.3 for compile instructions (default
is CVC disabled).
7.1.2 AV Mode
This mode of operation is active whenever a media stream is active.
7.2 Powering the Combined AV Headset On or Off
To power the headset on, hold down the Play/Pause (F1) button for at least two seconds.
To power the headset off, hold down the Stop (F2) button for at least four seconds. The headset will only
completely power down from that point when all current connections are closed, or a further timeout of five
seconds occurs.
7.3 Button Functionality
Table 7.1, Table 7.2 and Table 7.3 define the button functionality while the headset is in the different operation
modes.
Note:
! Long press - Button held for more than two seconds
! Short press - Button held for less than two seconds