CC2560A_16 Datasheet, PDF (31/51 Pages) Texas Instruments – Dual-Mode Bluetooth Controller

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CC2560A NRND; CC2564 NRND
CC2560A, CC2560B, CC2564, CC2564B
SWRS121E – JULY 2012 – REVISED JANUARY 2016
Figure 6-15. HFP 1.6 Architecture Versus Assisted HFP 1.6 Architecture
For detailed information on the HFP 1.6 profile, see the Hands-Free Profile 1.6 Specification
(www.bluetooth.org/en-us/specification/adopted-specifications).
6.4.4.2 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 mandates support of the SBC scheme. Other audio coding
algorithms can be used; however, both Bluetooth devices must support the same coding scheme. SBC 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 6-4 lists the recommended parameters for the SBC scheme
in the assisted A2DP modes.
Table 6-4. Recommended Parameters for the SBC Scheme in Assisted A2DP Modes
SBC
ENCODER
SETTINGS ⁽¹⁾
MONO
MID QUALITY
JOINT STEREO
MONO
HIGH QUALITY
JOINT STEREO
Sampling
frequency
44.1
48
44.1
48
44.1
48
44.1
48
(kHz)
Bitpool value
19
18
35
33
31
29
53
51
Resulting
frame length
46
44
83
79
70
66
119
115
(bytes)
Resulting bit
rate (Kbps)
127
132
229
237
193
198
328
345
(1) Other settings: Block length = 16; allocation method = loudness; subbands = 8.
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Detailed Description
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