YSS912

The YSS912 has the following features including Pin compatible with YSS902 (AC3D);Dolby Digital (AC-3)/Pro Logic and DTS decode;24 bit DSP. (Group-A Dolby Digital decoder);No external memory is required (Memory for center and surround channel delay is included) when DTS decoding as well as AC-3/Pro Logic;Possible to decode mufti-language encoded data. (possible to decode based on data-stream-number);AC-3 karaoke mode;Original compression mode as well as four compression modes recommended by Dolby. (when AC-3 decoding);Included de-emphasis filter;Pro Logic decoding for Dolby digital 2 channels decoded signal as well as ordinary PCM;High performance 25 MIPS programmable DSP suitable for a variety of sound field processing such as original surround,filtering, virtual surround etc..

The YSS912 is one chip LSI consisting two built-in DSP's;Dolby Digital (AC-3)/Pro Logic/DTS decoder(Main DSP) and a sound processing DSP (Sub DSP). Sub DSP is capable of realizing various sound fields, such as virtual surround,by down-loading the program and coefficient. Sub DSP is compatible with YSS902, the Sub DSP programs developed for YSS902 are also applicable to YSS912.The YSS912 consist of Main DSP section where AC-3lPro Logic/DTS decoding is executed and Sub DSP section where various sound field effects are added. Please refer to "BLOCK DIAGRAM" section.Sub DSP is a 8 ch input/8 ch output programmable DSP exclusively for the sound field processing.It can apply such effects as virtual surround, echo and equalizing. In addition, with an SRAM up to 1 Mbit connected, it can produce reverberation for one second or longer. By using this function, it is possible to simulate various fields such as a hall or a church.

If adopting some technology owned by another company is desired for use in Sub DSP section,note that a separate contract may be required between the owner of that technology and the user with respect to adoption of the technology.In Sub DSP section, various types of processing can be applied to the PCM data decoded in Main DSP section or inputted through SDIBO-3 terminals. Then, processed signals are outputted from each of SDOBO-3 terminals.