NJU25006

The NJU25006 is an all-digital surround sound processor that decodes matrix-encoded stereo and produces 2.1 channel PCM digital 3D audio. Because the NJU25006 initially decodes audio into 4.1 channel dolby pro logic and then reprocesses it into 2.1 channels, the resulting 3-D audio contains virtualized surround sound information.The NJU25006 can be used in several system configurations: 2.0 or 2.1 channel virtual dolby surround, and 4.0 or 4.1 channel pro logic.The NJU25006 flexibility allows one device to span an entire audio product family and to add enhanced features to your final system configuration.

Features of the NJU25006 are:(1)mono-to-stereo synthesis; (2)24-bit fixed point digital signal processing; (3)no dsp design required; (4)16- or 18-bit external AID and D/A converters; (5)serial digital audio converter interface; (6)operates from a single +5V supply; (7)evaluation board available; (8)on-chip digital surround delay,30ms maximum; (9)no external memory required; (10)internal auto input balance.

The absolute maximum ratings of the NJU25006 can be summarized as:(1)supply voltage Vdd:-0.3 to 7V;(2)storage temperature:-55 to +125;(3)operating temperature:-20 to 70 ;(4)input,output pin voltage:-0.3 to Vdd+0.3V.The processing of virtual dolby surround begins with decoding audio that includes surround sound information (preferably matrix-encoded stereo), The decoding process uses an on-chip dolby pro logic algorithm, resulting in 4 channel (L, C, R, S) surround sound. Next, the virtualizer algorithm processes the discrete surround sound and combines it, along with the center channel data, with the left and right audio channels. Highly directional encoded source material, such as a movie soundtrack, will result in the most dramatic virtual 3-D sound effect during playback, although all stereo audio sources benefit from virtual dolby surround processing.

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