Dolby Laboratories DP569 User Manual
Page 74
Model DP569 User’s Manual
Metadata
A–16
Table A-7 Dolby Surround Mode
Dolby Surround Mode
Setting
Definition
Not Dolby Surround
default
The bitstream contains information that was not Dolby
Surround encoded.
Dolby Surround
The bitstream contains information that was Dolby
Surround encoded. After Dolby Digital decoding, the
bitstream is Pro Logic decoded.
Not Indicated
There is no indication either way.
Audio Production Information
This parameter indicates whether the mixing level and room type values are valid. If
Yes, then a receiver or amplifier could use these values as described below. If No,
then the values in these fields are invalid. In practice only high-end consumer
equipment implements these features.
Table A-8 Audio Production Information
Audio Production
Information Setting
Definition
Yes
Mixing Level and Room Type parameters are valid.
No
Mixing Level and Room Type parameters are invalid
and should be ignored.
Mixing Level
The Mixing Level parameter describes the peak sound pressure level (SPL) as
experienced during the final mixing session at the studio or on the dubbing stage. The
parameter allows an amplifier to set its volume control such that the SPL in the replay
environment matches that of the mixing room. This control operates in addition to the
dialogue level control, and is best thought of as the final volume setting on the
consumer’s equipment. This value can be determined by measuring the SPL of pink
noise at studio reference level and then adding the amount of digital headroom above
that level. For example, 85 dB equates to a reference level of –20dBFS; the mixing
level is 85+20, or 105 dB.
Mixing Level Setting
80 to 111 dB in 1 dB increments
Room Type
The Room Type parameter describes the equalization used during the final mixing
session at the studio or on the dubbing stage. A Large room is a dubbing stage with
the industry standard X-curve equalization; a Small room has flat equalization. This
parameter allows an amplifier to set the same equalization as heard in the final mixing
environment.