Pioneer Stereo System Manuel d'utilisateur télécharger pdf (Page 17)

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THX Certified

THX is a Lucasfilm Ltd. program created to achieve maximum

accuracy in the reproduction of movie sound. Movie

soundtracks are recorded on a large "dubbing stage" using

professional equipment. For a soundtrack to be reproduced

accurately at home, special technologies are required. That's

because your "video room" is much smaller than a movie

theater and is acoustically live. What's more, your home theater

system uses speakers that are quite different from those found in

theaters — and there are only six of them. Finally, when you're

at home you sit much closer to the speakers than when you're

in a theater. These differences meant you missed the power,

thrill, and emotion of a good movie when you watched it at

home. Pioneer and Lucasfilm have teamed up to bring the full

glory of realistic cinema sound to the comfort and convenience

of your home.

Pioneer Elite THX/DTS/Dolby Digital A/V receivers offer:

THX Re-Equalization

™

: A movie theater is large and

acoustically dead, so specialized speakers are used, and typically

placed far from viewers. Since a soundtrack is recorded for

reproduction in such an environment, it sounds overly brilliant

when played at home. THX Re-Equalization compensates for

this acoustic difference by achieving smoother high-frequency

response.

THX Adaptive Decorrelation

™

: When surround

speakers play back a mono sound, it often seems to come from

one side rather than enveloping you from all sides as in a

theater. THX Adaptive Decorrelation helps to correct for this

inaccuracy by restoring spaciousness on surround signals.

THX Timbre Matching

™

: Surround sound should

envelop the viewer smoothly and seamlessly. Nothing is more

distracting than when sounds jump from one speaker to

another. By improving the front/surround matching, THX

Timbre Matching ensures smooth movement of surround

sound.

THX Bass Peak Level Management

™

: Some Dolby

Digital soundtracks produce bass peaks that are undesirable in a

home theater environment. THX Bass Peak Level Management

allows you to control maximum peak levels and properly adjust

them to your home theater system.

THX Loudspeaker Position Time Alignment

™

: This

feature lets you equalize differences in the distances between

individual loudspeakers and your listening position. Equalizing

these distances ensures both precise synchronization of the

outputs from all speakers and seamless continuity of the

soundfield.

THX Surround EX

THX Surround EX — Dolby Digital Surround EX is a joint

development of Dolby Laboratories and the THX division of

Lucasfilm Ltd. In a movie theater, film soundtracks encoded

with Dolby Digital Surround EX technology are able to

reproduce an extra channel — Surround Back — which has

been added during the mixing of the program. Because

currently available Dolby Digital has 5.1 channels — front left,

front center, front right, surround right, surround left and

subwoofer channels — Dolby Digital Surround EX offers 7.1

channels.

Encoded on special DVD movie releases, the Surround

Back channel places sounds behind the listener. This additional

channel allows more detailed imaging behind the listener and

brings more depth, spacious ambience and sound localization

than ever before. When released on the home consumer market,

movies that were created using the Dolby Digital Surround EX

technology bear a Dolby Digital Surround EX logo on the

packaging. The Pioneer Elite A/V receivers — all with the THX

Surround EX logo — can faithfully reproduce this technology in

the home in the THX Surround EX mode.

THX Select2

The VSX-84TXSi, VSX-82TXS, VSX-81TXV,

and VSX-80TXV all feature THX Select2

certification. This latest THX certification means

that a wide array of listening modes are offered to

enhance your entertainment. Each mode includes Pioneer-

proprietary Advanced Speaker Array (ASA) technology for

optimizing playback of multi-channel sound.

THX Cinema: This mode plays 5.1-channel movies using all

eight speakers. ASA technology processes audio signals sent to

the surround and surround back speakers in a way that

optimally blends the ambient and directional sound.

THX MusicMode: This mode is especially suited for multi-

channel music. ASA technology is applied to the surround

channels of 5.1-channel encoded music sources, creating a

wider yet stable acoustic ambience.

THX Games Mode: A full 360-degree, 3-dimensional acoustic

ambience is created from stereo or multi-channel game audio,

including analog sources and those in PCM, DTS, and Dolby

Digital formats. In addition to placing sound accurately, this

mode allows smooth point-to-point transition of audio, to

further enhance its realism.

*The THX logo is a trademark of THX Ltd., which may be registered in some jurisdic-

With the aid of a microphone, included in the

package, the MCACC measures the response from

each speaker and performs the following processes:

(1)

Checking the absence (or presence) of connected speakers

The system checks which speakers — front, center,

surround, surround back speakers, and/or subwoofer — are

connected to the A/V receiver.

(2) Detecting speaker size (large or small)

Bass sound for a small speaker is diverted to a large speaker

or subwoofer.

(3) Equalizing the differences of speaker distance from the

listening point

Electronically-generated sound delays, as well as those

caused by speaker distance gaps, are compensated for.

(4) Neutralizing the differences in sound pressure level

Gaps among channels are limited

to ±0.5 dB or less.

(5) Compensating for timbre differences

The frequency response of each speaker is measured and

adjusted for all nine (VSX-84TXSi, VSX-82TXS, and

VSX-81TXV) or five bands (VSX-80TXV). This is

completed with the original "Envelop Compensation"

applied technology, which ensures optimum timbre-

matching with minimum phase variations among channels.

(6) Time-axis compensation

(VSX-84TXSi/VSX-82TXS/VSX-81TXV)

A revolutionary function integrated into Advanced

MCACC. Acoustic treatment can be point-controlled,

either manually or automatically — by units of 20 msec

between 0msec and 80 msec points. Minute adjustment

allows you to create an ideal sound field according to the

acoustic characteristics of various listening environments.

* Room reverberation data, measured by Advanced MCACC, can be checked on the

PC screen or OSD.

(7) X-Curve Compensation

(VSX-84TXSi/VSX-82TXS/VSX-81TXV)

This technology not only calibrates the physical tonal

balance, but also corrects for the human brain's

interpretation of sound as it is affected by the room size.

The result is perfectly flat frequency response.

With all the Elite A/V receivers, you can manually fine-tune

the frequency responses of individual speakers according to taste.

MCACC Functions for the Latest Elite A/V Receivers

(VSX-84TXSi/VSX-82TXS/VSX-81TXV)

In addition to the functions described above, these receivers also

come with the following:

(1) Standing Wave Control

Acoustic standing waves

occur when sound waves

from your speaker system

resonate with those

reflected off the walls.

This can give a negative

effect on the overall sound,

especially certain lower frequencies — resulting in an overly

resonant, "boomy" sound depending on the speaker

positioning, your listening position, and the shape of your

room. The new Pioneer Elite A/V receivers' Standing Wave

Control effectively moderates the resonance in your

listening area. This technology also prevents inappropriate

EQ-setting calibration caused by standing waves.

(2) MCACC Memory (Delays, Levels, and Preset EQ)

MCACC Memory allows receivers to memorize up to six

preset combinations of delays, levels, and EQ settings. This

allows easy switching among combinations, depending on

the listening environment.

SURROUND

BACK FIELD

LOW FREQUENCY

EFFECT

SURROUND FIELD

LEFT

PRESENCE FIELD

Front: Forms the basis of a sound field as

the system's main channels.

Center: Clearly localizes dialog and vocals.

Surround Back: Ensures continuity of surround sound,

adding depth to the soundstage.

SURROUND FIELD

RIGHT

Subwoofer: Enhances suspense and psychological

tension with low-frequency sound effects.

Surround: Enhances surround sound by adding depth to

the sound field and emphasizing the sense of motion.

FR LS SB SB RS SW

Before

Compensation

After

Compensation

Automatic Compensation of Sound

Pressure Level

Amplitude

[

]

Frequency

[

]

OFF

-130.0

100 1k 10k 20k

Amplitude

[

]

Frequency

[

]

-130.0

-80.0 -80.0

100 1k 10k 20k

Standing Wave Control Filter

Original Frequency

Standing Wave in a Typical Listening Room

= Standing Wave

OSD for Standing Wave Control

Set-up Mic

Sound Pressure Level and Frequency Response Measured along Time Axis

A Highly Reverberant Room

A Room with No Reverberation

Frequency (Hz)

Level (dB)

Time (msec)

63.0

62.0

61.0

60.0

59.0

58.0

57.0

56.0

55.0

54.0

53.0

150

160

125

250

500

16k

140

130

120

110

100

Frequency (Hz)

Level (dB)

Time (msec)

125

250

500

16k

63.0

62.0

61.0

60.0

59.0

58.0

57.0

56.0

55.0

54.0

53.0

150

160

140

130

120

110

100

*Graphic images of the listening space's reverberation frequency response, measured by Advanced

MCACC, can be displayed on a PC screen via RS-232C output, with specialized software.

Comparison of 2-Dimensional and 3-Dimensional Compensation

2-Dimensional Compensation

Level

Frequency

3-Dimensional Compensation

Level

Frequency

Time

Home Theater Sound

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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Pioneer Stereo System Manuel d'utilisateur Page 17

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