User's Manual

UniStone
Bluetooth Capabilities
Product Overview 24 T3130-8XV10PO5-7600, 2007-01-31
5.2.2.1 Interface
The interface for synchronous data is either the HCI transport layer or the dedicated
PCM/I2S interface. The choice of interface for a synchronous connection is done with
the HCI+ command Infineon_Config_Synchronous_Interface and must be done before
the connection is established. The default interface is configurable via the bit Default_
SCO_interface in the BD_DATA parameter BB_Conf.
All details about the PCM/I2S interface are described in Section 3.2.
5.2.2.2 Voice Coding
Table 5-1 shows the supported values of the Bluetooth parameter Voice_Settings.
UniStone supports transcoding between any combination of linear, µ-law and A-law. If
the air coding format is “Transparent Data” and the synchronous interface is the
transport layer, the input coding is ignored. If transparent data is sent through the PCM/
I2S interface, the input coding determines if 8-bit or 16-bit samples are used.
Transparent Data is the only setting for which data rates other than 64 kbit/s can be used.
5.2.3 RSSI and Output Power Control
5.2.3.1 Received Signal Strength Indication (RSSI)
UniStone supports received signal strength measurements and uses LMP signaling to
keep the output power of a remote device within the golden receive power range. The
range is set with the BD_DATA parameters RSSI_Min and RSSI_Max.
5.2.3.2 Output Power Control
UniStone supports power control according to the Bluetooth 2.0 + EDR specification.
• The output power can be controlled in 4 steps when an external power amplifier is
present.
• The output power can be controlled in 3 or 4 steps (configurable) with internal power
settings. In this case no power amplifier is present; therefore UniStone can work as a
class 1, 2 or 3 device depending on the settings.
Table 5-1 Supported Voice Settings
Parameter Supported Values
Input Coding Linear (PCM/I2S only), µ-law, A-law
Input Data Format 2’s complement
Input Sample Size 16-bit (only relevant for linear input coding)
Air Coding Format CVSD, µ-law, A-law, Transparent Data