STV8217T datasheet(34/149 Pages) STMICROELECTRONICS

34 / 149 page

Dedicated Digital Signal Processor (DSP)

STV82x7

34/149

is processed by an identical HRTF curve but mixed in at a much lower amount. This HRTF

processing of equal (L/R) signals was again used to virtualize information to the rear of the listener.

The SRS

® TruSurround® is certified by Dolby Laboratories to be a Virtual Dolby® Digital and

Virtual Dolby

® Surround.

4.7.2

SRS WOW

The SRS

® WOW™ is an a sound processing system including:

● SRS

® 3D Mono/Stereo™

● SRS

® Dialog Clarity™

● SRS

® TruBass™

4.7.2.1 SRS 3D Mono/Stereo

This system is used to create a pseudo-stereo signal for mono inputs or a three-dimensional spatial

signal for stereo inputs.

4.7.2.2 SRS Dialog Clarity

This system is used to enhance dialog perception.

4.7.2.3 SRS TruBass

The SRS

® TruBass™ audio enhancement technology provides deep, rich bass to small speaker

systems without the need for a subwoofer or additional extra physical components. For systems

with a subwoofer, TruBass

™ complements and enhances bass performance. Psycho-acoustically,

when the human ear is presented with a low frequency sound signal that is missing the fundamental

harmonic, it will fill in the fundamental frequency based on the higher harmonics that are present.

By accentuating the second and higher frequency harmonics of the bass portion of a signal,

TruBass

™ gives the perception of greatly improved bass response.

SRS

® TruBass™ is implemented on loudspeakers path, headphone path or on both in parallel.

4.8

Smart Volume Control (SVC)

The Smart Volume Control regulates the audio signal level before audio processing. This regulation

is necessary in order for the signal level to be independent from the source (terrestrial channels, I2S

or SCART), its modulation (AM, FM or NICAM) and annoying volume changes (advertising, etc.).

The Smart Volume Control works as an audio compressor/expander; i.e. when the input signal

exceeds the threshold level, a very rapid attenuation (-2 dB/ms) is applied to rescale the signal

down to the threshold value. When the input signal is below the threshold level, the previous

attenuation is reduced slowly in order to retrieve the original input level (0dB gain). If the input signal

is too low, an addition gain of 6 dB can be provided.

To personalize the action of the SVC, five parameters are available:

1. Threshold: Maximum quasi-peak level that can be expected on output

2. Peak measurement mode: Select the channel on which the peak measurement must be

performed (Left, Right, Center...)

3. Release time: Gain slope applied to the amplification phase

4. Expander switch: To allow a +6dB amplification of small signals in order to reduce the output

dynamic range

5. Make up gain: Allows compensation of the signal amplitude limitation thanks to a 0 to 24 dB

adjustable gain.

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