Dolby Laboratories CP650 Installation Manual download pdf (Page 168)

Dolby

Model CP650 Installation Manual Format Definitions

D-8

Format 87 (Cat. No. 790 or earlier Cat. No. 794 required)

External 6-Channel with Surround EX

Short name: Fmt 11 w/Surr. EX

Audio Description: This external audio format is a combination of Formats 11 and 13,

and can be used when an external digital processor is connected. Signals of six discrete

channels (L, C, R, Ls, Rs, SW) are connected to the six-channel analog input connector.

L, C, R, and SW are sent discrete to the outputs. The unequalized Ls and Rs channels

are sent to the Surround EX matrix decoder to yield the channels Ls, Bs (which are

copied into the Bsl and Bsr channels), and Rs. The out-of-phase information is

discarded. The audio for the screen channels and subwoofer is output via the CP650’s

main audio outputs, and the audio for the four surround channels is output via the

Option card I/O connector. The subwoofer channel level is +10 dB referenced to the

optical, with no downward expansion.

Format 88 (Cat. No. 790 or 778 required)

6-Channel PCM

Audio Description: This format uses six discrete input channels (L, R, C, SW, Ls,

Rs) and processes them in the following manner:

1. The master audio clock source is the L/R input (first AES pair).

2. Dolby Digital bitstream decoding is disabled.

3. Digital subwoofer EQ and level processing is applied, but no lowpass filter is

used.

4. The Ls input is duplicated on the Bsl output, and the Rs input is duplicated on the

Bsr output.

5. The surround level adjustments are similar to those for 5.1 film formats, where

Ls/Bsl together produce 82 dBC SPL, and Rs/Bsr together produce 82 dBC SPL.

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Dolby Laboratories CP650 Installation Manual Page 168