Dolby Laboratories CP650 Installation Manual download pdf (Page 164)

Dolby

Model CP650 Installation Manual Format Definitions

D-4

Format 20

35 mm Magnetic, L, C, R 3-Channel

Short name: 3-Channel Mag

Audio Description: This magnetic audio format has four discrete channels (L, C, R,

S, though S is unused) and is input through the six-channel analog input. The

magnetic preamplifier units (MPUs) are external, and the Academy mag filters (if

required) are also external to the CP650. There is no derived subwoofer.

Format 22

35 mm Magnetic, 4-Channel

Short name: 4-Channel Mag

Audio Description: This format differs from Format 20 only because the mono

surround channel (S) is not muted in Format 22. This magnetic audio format has four

discrete channels (L, C, R, S) and is input through the six-channel analog input. The

MPUs are external, and the Academy mag filters (if required) are also external to the

CP650. There is no derived subwoofer.

Format 42

70 mm Dolby A-type Mag. Mono Surround

Short name: 70 mm Dolby Stereo

Audio Description: This magnetic audio format has six discrete input channels (L,

Le, C, Re, R, S) and is input through the six-channel analog input. The MPUs are

external. Four channels of A-type noise reduction are applied to the L, C, R, and S

tracks (tracks 1, 3, 5, and 6). The CP650 generates the outputs L, C, R, Ls, Rs, and

SW. The Ls and Rs outputs are copies of the “S” mono surround input track. The

subwoofer track is created by lowpass filtering the Le and Re tracks at 180 Hz and

summing them. The subwoofer level is set to +10 dB (relative to the optical

subwoofer level). The Le and Re tracks are used only to generate SW output, and do

not pass on any screen- or surround- channel audio.

Format 60

Nonsync 1

Audio Description: This external audio format has two discrete input channels (L, R)

and is input through the Nonsync 1 input connectors. L and R are passed to the L and

R outputs of the CP650. The L and R channels are also passed to the Pro Logic

decoder with only the surround signal being utilized and sent to the surround outputs

of the CP650.

Format 61

Nonsync 2

Audio Description: This external audio format has two discrete input channels (L, R)

and is input through the Nonsync 2 input connectors. L and R are passed to the L and

R outputs of the CP650. The L and R channels are also passed to the Pro Logic

decoder with only the surround signal being utilized and sent to the surround outputs

of the CP650.

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Dolby Laboratories CP650 Installation Manual Page 164

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