Simplifying implementation of mobile phone applications supporting high-sound-quality music distribution services and terrestrial digital broadcasting
Tokyo, June 6, 2005 −− Renesas Technology Corp. today announced the development of software dubbed "Enhanced aacPlus Decoding Middleware," supporting the Enhanced aacPlus
(1) | Providing development solutions for Enhanced aacPlus applications |
This new middleware will simplify the development of applications supporting music data distribution, video distribution with audio, and similar services using Enhanced aacPlus in mobile phone systems employing an SH-Mobile application processor. The Enhanced aacPlus Decoding Middleware will thus provide development solutions for applications supporting the aacPlus standard, including Enhanced aacPlus, which is expected to become widely adopted in various kinds of services. | |
(2) | Optimized for the SH4AL-DSP top-end SH-Mobile CPU core, allowing full use of the SH4AL-DSP's capabilities |
The current aacPlus Decoding Middleware is optimized for the SH-Mobile SH3-DSP CPU core. This new middleware is optimized for the top-end SH4AL-DSP CPU core in addition to the SH3-DSP, providing an approximately 20% processing load reduction in SH4AL-DSP core products compared with the current middleware. This will offer users an extra performance margin in developing multimedia applications such as music players and moving image players with voice and audio capability. | |
(3) | Terrestrial digital broadcasting audio processing capability plus low-power mode for longer viewing/listening times |
A decision has been made to formally adopt aacPlus as an audio codec for domestic Japanese terrestrial digital broadcasts. Terrestrial digital broadcast audio processing requires processing of audio multiplex channels (dual monaural channels) comprising main and sub audio channels in addition to monaural and stereo channels. Enhanced aacPlus Decoding Middleware newly incorporates dual monaural channel audio processing capability, enabling terrestrial digital broadcasting to be handled. A low-power mode function is also included. Use of this function helps to extend terrestrial digital broadcasting viewing/listening time, for example. |
Notes: | 1. | aacPlus is a trademark of Coding Technologies. Enhanced aacPlus is equivalent to the technology called aacPlus v2 by Coding Technologies. Coding Technologies URL: http://www.codingtechnologies.com/ |
2. | SH-Mobile (SuperHTM Mobile Application Processor): An original Renesas Technology processor for mobile phone systems that is connected to a baseband LSI and performs dedicated processing of audio, moving image, and similar multimedia applications SuperH is a trademark of Renesas Technology Corp. | |
3. | SBR (Spectral Band Replication) is a highly efficient digital audio data coding technology developed by Coding Technologies. SBR is a registered trademark of Coding Technologies. In the compression process, the effective amount of audio data is halved by performing down-sampling (halving the sampling rate), and in the expansion process, data is restored by performing up-sampling. The special technological feature here is that data lost during down-sampling (high-frequency spectrum data) is restored by using auxiliary parameters in the expansion process. | |
4. | PS (Parametric Stereo) is a highly efficient digital audio data coding technology developed by Coding Technologies and Royal Philips Electronics. In the compression process, the effective amount of audio data is reduced by mixing and monauralizing stereo data, and in the expansion process, stereo data is restored. The special technological feature here is that data such as left/right sound characteristics lost during mixing is restored by using auxiliary parameters in the expansion process. | |
5. | Software pipelining : A programming technique for improving software processing efficiency by optimizing the order in which processor instructions are executed. Interdependence between instructions is taken into consideration in optimizing the execution order to increase the degree of parallelism of instruction execution. |
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Item | Specifications | ||||||||
Applicable device | SH-Mobile | ||||||||
Supported OS | µITRON* | ||||||||
Standard compliance |
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Supported audio formats | MPEG2/4-AAC/aacPlus/Enhanced aacPlus | ||||||||
Sampling rate | 8 to 96 kHz (AAC) 16 to 48 kHz (aacPlus) | ||||||||
Bit rate | 8K to 576K bits/sec (AAC) 8K to 128K bits/sec (aacPlus) |