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2004 Jan 26 49
Philips Semiconductors Product specification
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
SAA6752HS
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Note
1. If no Q matrix is downloaded then the default is the MPEG standard and no Q matrix is inserted into the stream.
79 I quantizer matrix R/W 2 × 64 bytes array of integers
(8 × 8 bytes)
− Specifies the quantizer matrix as 2 tables,
each an 8 × 8 array. Data must be
transferred column by column, not row by
row. The inter Q matrix must be downloaded
first, the intra Q matrix downloaded second;
note 1.
7A I reserved −− − − −
7B I disable forced
backward prediction
R/W 1 byte 0 Applies only for GOP structures starting with
a B-frame: Disabled forced backward
prediction results in non-editable (open)
GOPs with prediction from a former GOP.
Enabled forced backward prediction results
in backward predicted closed GOPs without
prediction from a former GOP.
In all cases the leading B-frames of the very
first GOP structure after start of encoding
are forced to backward prediction.
bit 0 = 0 enabled
bit 0 = 1 disabled
7C I scan select R/W 1 byte 0
bit 0 = 0 alternate scan
bit 0 = 1 zigzag scan
7D I quantizer scale
table
R/W 1 byte 0
bit 0 = 0 logarithmic
bit 0 = 1 linear
ADR
HEX
M COMMAND NAME R/W SIZE/POSITION PARAMETER/RANGE DEFAULT DESCRIPTION