STV82X7 datasheet(28/149 Pages) STMICROELECTRONICS

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Dedicated Digital Signal Processor (DSP)

STV82x7

28/149

4.3

ST WideSurround

STV82x7 offers three preset ST WideSurround Sound effects on the Loudspeakers path:

● Music, a concert hall effect

● Movie, for films on TV

● Simulated Stereo, which generates a pseudo-stereo effect from mono source

“ST WideSurround Sound” is an extension of the conventional stereo concept which improves the

spatial characteristics of the sound. This could be done simply by adding more speakers and coding

more channels into the source signal as is done in the cinema, but this approach is too costly for

normal home use. The ST WideSurround system exploits a method of phase shifting to achieve a

similar result using only two speakers. It restores spatiality by adding artificial phase differences.

The Surround/Pseudo-stereo mode is automatically selected by the Automatic Standard

Recognition System (Autostandard) depending on the detected stereo or mono source. By default,

“Movie” is selected for Surround mode. This value may be changed to “Music” by the

STSRND_MODE bit in the STSRND_CONTROL register.

Additional user controls are provided to better adapt the spatial effect to the source. The ST

WideSurround Gain (STSRND_LEVEL) and ST WideSurround Frequency (STSRND_FREQ)

registers can be used to enhance Music Predominancy in Music mode and Theater effect and Voice

Predominancy in Movie mode.

4.4

ST OmniSurround

STV82x7 offers a spatial virtualizer to output any multi-channel input in stereo on the Loudspeakers

path:

“ST OmniSurround” will recreate a multi-channel spatial sound environment using only the Left and

Right front speakers. It can be adapted to any input configuration (OMNISRND_INPUT_MODE).

ST Voice will allow you to enhance the voice content of your program to increase the intellegibility

and the presence of the sound.

4.5

Dolby Pro Logic II Decoder

Dolby

® Pro Logic II® is a matrix decoder that decodes the five channels of surround sound that

have been encoded onto the stereo sound tracks of Dolby

® Surround program material such as

DVD movies and TV shows.

It is even possible to decode standard stereo signals like music or non encoded movies.

Furthermore, it is an active process designed to enhance sound localization through the use of very

high-separation decoding techniques.

The Dolby

® Pro Logic II® decoder is also able to emulate the former Dolby® Pro Logic® decoder

in a specific mode.

4.6

Bass Management

This processing will generate the subwoofer signal and adjust all loudspeakers channels gain and

bandwidth.

Speakers capable of reproducing the entire frequency range will be referred to as “full range

speakers”, then signals sent to full range speaker will be full bandwidth (no filtering).

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