Pioneer VSX-D3S Gebruiksaanwijzing - Pagina 39

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THE LASER DISC FORMAT

The one major concern when the idea of incluiding another form of audio on a laser disc was .... Backwards Compatibility. It would not

do the laser disc format any justice, especially in a time of growing acceptability, to change the audio system without considering those

consumers that had already purchased a laser disc player. Thus to maintain backward compatibility, the AC-3 encoding was deemed

to be stored in one of the existing analog tracks.

Digital (PCM)

Audio

The above diagram shows the format of the AC-3 Pro-Logic laser disc. The PCM audio track, containing the 4-channel matrixed digital

soundtrack, was fully maintained for continued use in laser disc players with digital capabilities. As mentioned above, one of the analog

channels will now contain the AC-3 encoding, while the other analog channel will contain a mono analog soundtrack, which still provides

backwards compatibility with those pre-1984 laser disc players (1984 was the year we introduced an LD player with digital capabilities).

THE ADVANTAGES OF AC-3 OVER PRO-LOGIC

AC-3 is called a 5.1-channel system because it provides 5 independent channels (left, right, center, left surround, and right surround),

all reproducing a 20 – 20,000 Hz range. In addition, the system provides for an independent sub-woofer channel, which is called a low

frequency effects channel. Use of the low frequency effect channel is optional, since the 5 channels provide a full frequency bandwidth,

but available for those consumer wishing to include a sub-woofer for thunderous bass reproduction. Furthermore, AC-3 provides

improved channels separation, multi-directional discrete capability, and increased sound-design creative flexibility (for the movie

makers). Below highlights some of the other advantages of Dolby AC-3:

Available Channels on Disc

Playback Channels

Description of Playback Channels

Sound Processing

Surround Channel Maximum

Frequency Response

Other Information

Dolby AC-3

Analog Mono

Digital Audio

Audio

DOLBY SURROUND DIGITAL (AC-3)

5.1 Channels

Left, Right, Center, Left Surround, Right

Surround, and Sub-woofer

Discrete Digital AC-3

Encoding & Decoding

20,000 Hz

- 5 Discrete Channels

- Fully Backward Compatible with

Dolby Surround

- High Dynamic Range

- Extremely Accurate and Natural

Sound for Vocals and Effects Imaging

Dolby AC-3

Analog Mono

Digital Audio

Audio

Left, Right, Center, and Surround

Analog Matrix Processing for Dolby Surround

APPENDIX C: DOLBY AC-3 SURROUND

Analog Video

14 MHz

DOLBY SURROUND PRO-LOGIC

2 channels

4 channels

7,000 Hz

ARB7050