CC256X_13 Datasheet, PDF (24/51 Pages) Texas Instruments – Bluetooth and Dual-Mode Controller

CC256x
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
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Figure 3-16. 3HFP1.6 Architecture Versus Assisted HFP1.6 Architecture
For detailed information on the HFP1.6 profile, see the Hands-Free Profile 1.6 Specification
(www.bluetooth.org/en-us/specification/adopted-specifications).
3.5.4.2 Assisted A2DP
The advanced audio distribution profile (A2DP) enables wireless transmission of high-quality mono or
stereo audio between two devices. A2DP defines two roles:
• A2DP source is the transmitter of the audio stream.
• A2DP sink is the receiver of the audio stream.
A typical use case streams music from a tablet, phone, or PC (the A2DP source) to headphones or
speakers (the A2DP sink). This section describes the architecture of these roles and compares them with
the corresponding assisted-A2DP architecture. To use the air bandwidth efficiently, the audio data must be
compressed in a proper format. The A2DP profile mandates support of SBC coding. Other audio coding
algorithms can be used; however, both Bluetooth devices must support the same coding scheme. SBC
coding is the only coding scheme spread out in all A2DP Bluetooth devices and thus the only coding
scheme supported in the assisted A2DP modes. Table 3-6 lists the recommended parameters for SBC
coding in the assisted A2DP modes.
Table 3-6. Recommended Parameters for SBC Coding in Assisted A2DP Modes
SBC
Encoder
Settings ⁽¹⁾
Sampling
frequency
(kHz)
Bitpool value
Mono
Mid Quality
Joint Stereo
44.1
48
44.1
48
19
18
35
33
Mono
High Quality
Joint Stereo
44.1
48
44.1
48
31
29
53
51
(1) Other settings: Block length = 16; allocation method = loudness; subbands = 8.
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