Dolby Laboratories DP570 - Manual (Page 111)

A Guide to Dolby Metadata Parameter Definitions
Dolby ® DP570 Multichannel Audio Tool User’s Manual 99
Copyright Bit
This parameter indicates whether the encoded Dolby Digital bitstream is copyright
protected. It has no effect on Dolby Digital decoders and its purpose is purely to provide
information.
Original Bitstream
This parameter indicates whether the encoded Dolby Digital bitstream is the master
version or a copy. It has no effect on Dolby Digital decoders and its purpose is purely to
provide information.
DC Filter
This parameter determines whether a DC‐blocking 3 Hz highpass filter is applied to the
main input channels of a Dolby Digital encoder prior to encoding. This parameter is not
carried to the consumer decoder. It is used to remove DC offsets in the program audio and
would only be switched off in exceptional circumstances.
Lowpass Filter
This parameter determines whether a lowpass filter is applied to the main input channels
of a Dolby Digital encoder prior to encoding. This filter removes high‐frequency signals
that are not encoded. At the suitable data rates, this filter operates above 20 kHz. In all cases
Table D-14 Copyright Bit Settings
Copyright Bit Setting
Yes
No
Table D-15 Original Bitstream Settings
Original Bitstream
Setting
Yes
No
Note: The parameters DC Filter, Lowpass Filter, LFE Lowpass Filter, Surround 3 dB
Attenuation, and Surround Phase Shift appear after the Extended BSI parameters
on Dolby E and Dolby Digital equipment menus.
Table D-16 DC Filter Settings
DC Filter Setting
Enabled
Disabled