MSP3450G datasheet(13/106 Pages) MICRONAS

13 / 106 page

DATA SHEET

MSP 34x0G

Micronas

May 27, 2003; 6251-476-1DS

2.4. Source Selection and Output Channel Matrix

The Source Selector makes it possible to distribute all

source signals (one of the demodulator source chan-

nels, SCART, or I2S input) to the desired output chan-

nels (loudspeaker, headphone, etc.). All input and out-

put signals can be processed simultaneously. Each

source channel is identified by a unique source

address.

For each output channel, the sound mode can be set

to sound A, sound B, stereo, or mono by means of the

output channel matrix.

If Automatic Sound Select is on, the output channel

matrix can stay fixed to stereo (transparent) for

demodulated signals.

2.5. Audio Baseband Processing

2.5.1. SRS WOW

License Notice: SRS, SRS WOW, and the SRS Logo

are trademarks of SRS Labs, Inc. A license from SRS

Labs, Inc. is required before an SRS-version of the

MSP 34x0G can be purchased.

SRS Labs’ WOW technology enlarges the sound

image field and improves the bass performance of

television speakers. Manufacturers can save costs by

licensing WOW while utilizing smaller speakers and

still provide a higher quality audio experience.

WOW consists of three sections:

– Clarity Improvement,

–3D-Audio

(SRS, Sound Retrieval System),

and

– Bass Enhancement (TruBass).

Key features of WOW include:

– Wider and taller sound image field

– Larger sweet spot

– Deep, rich bass tones

– Quality improvements to audio listening experience

– Improved clarity of speech

All MSP 34x0G are shipped without SRS except other-

wise ordered. When an SRS-version of MSP 34x0G is

ordered, it carries a special marking on the chip for

identification. The SRS WOW functionality must be

enabled

writing

"license

key"

into

the

MSP 34x0G. For information on how to obtain this

license key from Micronas, please contact your Micro-

nas sales representative.

2.5.2. BBE High Definition Sound

License Notice: BBE is a registered trademark of

BBE Sound Inc., the BBE Logo is a trademark of BBE

Sound Inc. A license from BBE Sound Inc. is required

before a BBE-version of the MSP 34x0G can be pur-

chased.

BBE High Definition Sound or, also called, Sonic Maxi-

mizer technology improves the clarity of music when

played back via loudspeakers. A more “life like” feeling

is created by BBE. The BBE-approved Micronas

implementation works in the digital domain and thus

needs no external components and does not suffer

from tolerances and aging effects.

All MSP 34x0G are shipped without BBE except other-

wise ordered. When a BBE-version of the MSP 34x0G

is ordered, it carries a special marking on the chip for

identification. The BBE Sonic Maximizer functionality

must be enabled by writing a "license key" into the

MSP 34x0G. For information on how to obtain this

license key from Micronas, please contact your Micro-

nas sales representative.

2.5.3. Micronas VOICE

Micronas VOICE was developed to add the following

improvements to speech signals:

– Increase speech signal over background noise to

increase intelligibility in noisy environments

– Move voice to the foreground, closer to the listener,

while other sounds are moved to the back

– Improve voices that are hard to understand, leave

clear voices largely undisturbed

Micronas VOICE dynamically enhances those portions

of speech that are important for intelligibility while at

the same time decreasing portions of the signal that

disturb intelligibility. The average amplitude of the sig-

nal is not changed.

According to speech theory, there are two main effects

that affect the intelligibility of speech. Micronas VOICE

combines

both

effects

achieve

maximum

enhancement of intelligibility.

– Forward and backward masking: For intelligibility,

consonants are more important than vowels, but the

amplitude of consonants is much lower than that of

vowels. The consonants are masked by the vowels.

Therefore, the amplitude of consonants is increased

and the amplitude of vowels decreased.

– Phonemes and formants: Most important for intelli-

gibility are the second to fourth formants of speech.

These formants are detected and increased, while

other parts of the signal are decreased.

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