Installation manual

Dolby
®
Model CP650 Installation Manual Format Definitions
D-2
D.2 Format Definitions
The formats supported by the CP650 are described below. If a format name is too
long for display on the CP650 front-panel (limited to 19 characters), a second, short
name is given.
Format 01
Academy Mono Optical
Short name: Mono
Audio Description: Optical mono audio comes in on either projector’s optical input,
has no noise reduction applied, and is intended to produce audio on the center channel
only. This format takes Lt + Rt and puts the result on the center channel only. There
is no derived subwoofer. The mono EQ and mono level trim settings are enabled.
In this format, processing is applied after the optical preamps and the slit-loss filter, to
obtain the desired response curve.
Format 04
Dolby A-type Optical
Short name: Dolby A-type
Audio Description: Either projector’s optical input provides Lt/Rt inputs, and matrix
decoding produces four output channels (L, C, R, S). A-type noise reduction is
applied to Lt and Rt.
The subwoofer signal is derived by summing L + C + R (after matrix decoding). This
audio is then filtered by applying a user-selectable 50 or 100 Hz subwoofer filter,
applying the downward expander, the parametric equalizer, and finally a separate
optical subtrim. The level is nominally set to match the passband level of the center
channel using an RTA.
Format 05
Dolby SR Optical
Short name: Dolby SR
Audio Description: Either projector’s optical inputs provides Lt/Rt inputs, and
matrix decoding produces four output channels (L, C, R, S). SR processing is applied
to Lt and Rt.
The subwoofer signal is derived in the same way as in Format 04.