6. Will an incoming call mute the audio playback from iPod, USB drive, SD card or AUX-IN
player?
When there is an incoming call, audio playback from iPod/iPhone, USB drive or SD card will
automatically pause and mute. AUX-IN player will not pause but will mute.
7. What are A2DP and HFP?
A2DP and HFP are standard profiles defined and adopted by the Bluetooth SIG as following:
I. Advanced Audio Distribution Profile (A2DP)
This profile defines how high quality audio (stereo or mono) can be streamed from one device to
another over a Bluetooth connection. For example, music can be streamed from a mobile phone, to
a wireless headset, hearing aid & cochlear implant streamer, car audio, or from a laptop/desktop to
a wireless headset.
II. Hands-Free Profile (HFP)
Currently in version 1.6, this is commonly used to allow car hands-free kits to communicate with
mobile phones in the car. It commonly uses Synchronous Connection Oriented link (SCO) to carry a
monaural audio channel with continuously variable slope delta modulation or pulse-code
modulation, and with logarithmic a-
law or μ-law quantization. Version 1.6 adds optional support for
wide band speech with the mSBC codec, a 16 kHz monaural configuration of the SBC codec
mandated by the A2DP profile.
The Bluetooth car kits allow users with Bluetooth-equipped cell
phones to make use of some of the phone's features, such as making calls, while the phone itself
can be left in the user's pocket or hand bag.
