Grass Valley Imagestore 750 v.2.0.1 - Manual (Page 372)

Dolby Decode/Encode Imagestore 750 User Manual
Page 372 Miranda Technologies Inc.
Copyright
If this attribute is set then the information in the bitstream is indicated as
protected by copyright. Otherwise it is not indicated as protected.
Original Bitstream
This attribute indicates whether the bitsteam is original or a copy of another
bitstream.
High Pass Filter
This frame element indicates whether or not the DC blocking 3 Hz highpass
filter is applied to the main input channels in the Dolby Digital encoder. It is
used to remove DC offsets in the program audio and would only be switched
off in exceptional circumstances.
Bandwidth Low Pass Filter
This parameter determines whether a lowpass filter is applied to the main
input channels of a Dolby Digital encoder prior to encoding. The filter
removes high frequency signals that are not encoded. At the suitable data
rates this filter operates above 20 kHz. In all cases it prevents aliasing on
decoding and is normally switched on. This parameter is not passed to the
consumer (AC3) decoder.
LFE Low Pass Filter
This frame element determines whether a 120 Hz lowpass filter (used to
remove frequencies above 120 Hz that would cause aliasing when decoded)
is applied to the LFE channel input of a Dolby Digital encoder prior to
encoding. It is ignored if the LFE channel is disabled. This filter should only
be switched off if the audio to be encoded is known to have no signal above
120 Hz. This parameter is not sent to the consumer decoder.
Surround 90 Degrees Phase
This frame element causes the Dolby Digital encoder to apply a 90-degree
phase shift to the surround channels. This allows a Dolby Digital decoder to
create a Lt/Rt downmix simply. For most material the phase shift has a