Advanced Audio Distribution Driver
In order to use Bluetooth, a device must be compatible with the subset of Bluetooth profiles 1 Advanced Audio Distribution Profile (A2DP); 2 Attribute Profile (ATT); 3 Audio/Video Remote Control Profile (AVRCP); 4 Basic Imaging Profile (BIP) Advanced Audio · Audio/Video Remote · Generic Audio/Video. A chipset for an audio player supporting Bluetooth advanced audio distribution profile (A2DP). The chipset comprises first and second processors. The first. PC Magazine Tech Encyclopedia Index - Definitions on common technical and computer related terms.
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Advanced Audio Distribution Driver
Advanced Audio Distribution Profile Definition from PC Magazine Encyclopedia
The MCU is used to communicate with peripherals and access an external storage devicesuch that the audio source data can be retrieved. An audio parser parses retrieved the audio source data, such that the retrieved audio source data can be decoded by a subsequent audio decoder in the DSP The DSP is typically provided with strong computing power, thus is suitable for audio decoding.
The audio decoder decodes the retrieved audio Advanced Audio Distribution data and generates an audio input to a speaker The audio player chipset acts as a Bluetooth Advanced Audio Distribution with a Bluetooth controller module connected thereto, Advanced Audio Distribution that Bluetooth communication is supported.
In the Bluetooth host, software implementation typically fulfills communication protocols required for L2CAP services and application programs in a Bluetooth system. The communication protocols required for applications are shown in FIG.
The audio player chipset transmits decoded pulse code modulation PCM audio input to the external Bluetooth controller chip via a digital audio interface. This architecture requires a powerful Bluetooth controller chip, thus the cost of it is high. This architecture requires a powerful MCU provided with enough remaining system resources. The first and the second processors collectively act as a Advanced Audio Distribution host.
An embodiment of a method of generating advanced audio distribution profile A2DP source code, comprises Advanced Audio Distribution audio source data from a storage device, performing a first part of advanced audio distribution profile A2DP source encoding in a first processor, and performing a second part Advanced Audio Distribution advanced audio distribution profile A2DP source encoding in a second processor.
Architecture of software implementation of advanced audio distribution profile A2DP source encoding in an audio player provided with multiple processors is disclosed.
Resources of the multiple processors are more effectively utilized such that the advanced audio distribution profile A2DP is supported. A detailed description is given in the following embodiments with reference to the accompanying drawings.
Bluetooth® Advanced Audio Distribution Profile (A2DP) Profile Support
This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the Advanced Audio Distribution claims.
More specifically, the audio player may be a mobile phone. The chipset comprises a first processor and a second processor More specifically, the storage device may be a magnetic memory Advanced Audio Distribution, an optical memory device, a semiconductor memory, or combinations thereof. Preferably, the first processor is a microcontroller unit MCU and the second processors is a digital signal processor DSP. In addition, the chipset further comprises a host controller interface HCI coupled between Advanced Audio Distribution Bluetooth host and a Bluetooth controller The first and second processors and collectively act as a Bluetooth host performing A2DP source encoding.
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Advanced Audio Distribution transfer flow of A2DP source encoding is described as follows. Decoded audio source data from the audio decoder undergoes SBC encoding by applications on the audio source side according to A2DP specifications. SBC is the only encoding scheme necessarily supported.
Compressed music files are decompressed for Advanced Audio Distribution in pulse coded modulation PCM format by an audio decoder. Polyphase analysis generates sub-band samples. In stepscale factors are calculated according to signal characteristics of each sub-band and bit allocation of each sub-band is derived.
Then, in stepthe sub-band samples are scaled and APCM quantized. Thereafter, in stepthe quantized sub-band samples are packed into a bit stream.
List of Bluetooth profiles - Wikipedia
Scale factor calculation, bit allocation, APCM quantization, and bit stream packing require more program memory but less computing power. The first processor is typically provided with a larger Advanced Audio Distribution space and an interface for an external memory. Programs are typically executed in the external memory provided with low cost but long access cycle.