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Cirrus Logic announced the availability of the CS49700 single-chip audio processor to meet the pressing needs of consumer electronics manufacturers supporting HD and Blu-ray Disc® DVD HD formats. The device meets the processing task requirements associated with these new standards. The mass-produced CS49700 is suitable for high-volume home theater products such as audio/video receivers, high-definition DVD players and receivers, as well as Blu-ray and HD-DVD players. Currently, products at all price points are available.Today's DVD standard requires the chip to support two major audio decoding surround sound standards, the Dolby® Digital and DTS® standards. To implement the next generation of Blu-ray and HD-DVD formats, audio processor ICs must support up to six surround sound audio algorithms, including Dolby Digital, Dolby Digital Plus, Dolby TrueHD, DTS, DTS Master, and DTS High Resolution. Any of these standards can be integrated into HD DVD discs. The CS49700 supports any audio format and is suitable for mid- to low-end home theater products.
The 32-bit CS49700 features a dual-core architecture for true parallel processing at speeds up to 1.8 G (300 million instructions per second). Compared to many general-purpose DSPs, the CS49700's hardware, software, and firmware are optimized for audio processing, providing an efficient chip solution that requires less memory and reduces overall processing power.
It is a very complicated problem to support all the necessary audio algorithms for both Blu-ray and HD-DVD formats and to face the challenges of the system clock compared to the current standard DVD format. In addition to having to support existing standards and other new algorithms, many of these new algorithms require bit-level processing speeds that are much higher than the 384 kbps commonly used in current DVD systems. For example, lossless surround sound algorithms, such as Dolby's TrueHD and DTS HD Master Audio, require bit-level processing of up to 18 to 24 Mbps, respectively. Multiple audio formats also present many clock frequency challenges. The CS49700 generates a system clock source with an advanced phase-locked loop (PLL) for efficient management.
The CS49700 also provides post-processing algorithms such as Dolby Pro Logic® IIx, DTS 96/24, Neo:6®, MPEG, AAC, SRS® Circle Surround® II, Dolby Headphone®, Dolby Virtual Speaker®, SRS Tru-Surround XT ® and THX® Ultra2, all integrated into the on-chip ROM of the IC.
The CS47900 also supports the HDMI 1.3 interface, a new digital audio and video interconnect standard. This standard is used to transfer digital audio and video signals between home theater devices, such as audio/video receivers, DVD players, and flat-panel televisions.
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