Renesas Technology Releases SBC Middleware for SH3-DSP CPU Core Compliant with Bluetooth® Technology A2DP Audio Profile

Tokyo, July 7, 2006 −− Renesas Technology Corp. today announced "SBC Middleware" software supporting the SBC (Subband Codec) audio data coding method stipulated in Bluetooth^*1 technology for short-range wireless communications, for microprocessors incorporating Renesas Technology’s 32-bit RISC processor SuperH™^*2 Family SH3-DSP CPU core.  This new middleware will be available from July 20, 2006 in Japan.

SBC is a coding method stipulated in the A2DP (Advanced Audio Distribution Profile) audio data profile defined by the Bluetooth technology specifications.  The SH3-DSP CPU core is suitable for mobile device use, and can implement audio-related applications for Bluetooth devices, in mobile audio devices including mobile phones and the like.

Features of this new middleware are summarized below.

< Product Background >

Bluetooth technology is a short-range wireless communication method. In recent years, an increasing number of systems providing wireless transfer and playback of data by means of Bluetooth technology have appeared in such products as mobile audio devices and in-vehicle audio systems. An essential requirement for implementing a Bluetooth audio application is compliance with the SBC audio data coding method stipulated in the Bluetooth A2DP audio profile.

Renesas Technology has released various semiconductor devices for use in multimedia products, and also offers a lineup of moving image middleware for MPEG-4 and similar applications and audio middleware for MP3 and MPEG-4 AAC applications and the like.

Now, to provide enhanced multimedia application development solutions, Renesas Technology has developed SBC Middleware for the SH3-DSP CPU core, for use in the development of audio applications in Bluetooth devices, which are expected to become increasingly popular in the future.


< Additional Product Details >

SBC is a highly efficient coding method specified by Bluetooth Special Interest Group (SIG) as a standard audio codec in a Bluetooth device. In the A2DP audio data profile of Bluetooth technology, SBC is essential as an audio data coding method for maintaining interconnectivity, and MP3 and MPEG-4 AAC are specified as options.

SBC Middleware is compliant with the A2DP specification, and comprises "SBC Encode Middleware" and "SBC Decode Middleware." In audio data transmission, SBC Encode Middleware encodes 16-bit linear PCM (Pulse Code Modulation) data and generates an SBC bit stream. SBC Decode Middleware is used in audio data reception, decoding a received SBC bit stream and generating 16-bit linear PCM data. In this way, the development of both transmitting-side and receiving-side devices can be supported.

The SBC Middleware algorithm is optimized for the architecture of the SH3-DSP CPU core. Encoding and decoding are implemented at low CPU processing load levels of 36 MHz (typ.) and 37 MHz (typ.) respectively, contributing to the creation of low-power devices.

This middleware offers C-language function interfaces. This means that the user only has to write the relevant function interface within a program, simplifying the development of an A2DP compatible application. This interfacing is equivalent to the MP3 and MPEG-4 AAC middleware interfacing previously offered by Renesas Technology, facilitating multi-codec implementation for audio codec in Bluetooth devices.

Future plans include the development of this middleware for use with microprocessors incorporating an SH-4 CPU core, and expansion into other application areas such as in-vehicle audio systems.

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Typical Applications

Development of audio applications for Bluetooth devices using a SuperH Family microprocessor incorporating an SH3-DSP CPU core

Specifications

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