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doc: Add EchoCancelingNoiseReduction to Handsfree 

This patch adds echo canceling and noise reduction property to Handsfree
interface, allowing the handsfree unit to disable this feature in the
audio gateway. The HFP spec defines the procedure to turn off echo
canceling and noise reduction only, it is not allowed to enable this
feature from the HF unit.

According to Bluetooth HFP 1.6 spec: By default, if the AG supports its
own embedded echo canceling and/or noise reduction functions, it shall
have them activated until the AT+NREC command is received from the HF
unit. From then on, and until the current Service Level Connection is
dropped for any reason, the AG shall disable these functions every time
an Audio Connection is established.
This commit is contained in:
Claudio Takahasi 2013-04-23 14:21:37 -03:00 committed by Denis Kenzior
parent 7b56ca2730
commit dcf2ca0c41
1 changed files with 10 additions and 0 deletions
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doc/handsfree-api.txt
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@ -44,6 +44,7 @@ Properties array{string} Features [readonly]
supported values are:
"voice-recognition"
"attach-voice-tag"
"echo-canceling-and-noise-reduction"
boolean InbandRinging [readonly]
@ -56,6 +57,15 @@ Properties array{string} Features [readonly]
to activate or deactivate the function from the HF, or
the AG could autonomously initiate it.
boolean EchoCancelingNoiseReduction [readwrite]
Non-persistent Boolean property representing whether
echo canceling and noise reduction is enabled in the
AG. This feature can only be disabled once from the
HF unit; the current specification does not allow the
HF unit from enabling this feature on the AG once
it has been disabled.
byte BatteryChargeLevel [readonly]
The current charge level of the battery. The value