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2004 Jan 26 48
Philips Semiconductors Product specification
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
SAA6752HS
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Table 20 I
2
C-bus video encoder: general
ADR
HEX
M COMMAND NAME R/W SIZE/POSITION PARAMETER/RANGE DEFAULT DESCRIPTION
70 I disable video
encoder
R/W 1 byte enabled Specifies if the video encoder is enabled.
If the video encoder is disabled, no video
data will be inserted in the output stream.
bit 0 = 0 enabled
bit 0 = 1 disabled
71 I bit rate mode R/W 1 byte VBR defines the encoding bit rate control mode
(variable or constant bit rate)
bit 0 = 0 VBR
bit 0 = 1 CBR
72 I GOP definition R/W 2 bytes 0001H:
M=0;
N=1
Defines the used GOP structure as (N.M),
where ‘N’ is the number of frames per GOP
and ‘M’ is the distance of 2 sequential I- or
P-frames (reference frame distance);
distance = 0 is I-frame coding; see Table 3
for meaningful combinations.
byte 0 distance (M) (0 to 3)
byte 1 length (N) (0 to 19)
73 I, E, P,
S
user data GOP
header
R/W 64 bytes all 0 Specifies the data to be inserted into the
GOP header.
74 I, E, P,
S
number of user data
GOP
R/W 1 byte 0 Specifies the amount of user data to be
inserted into the GOP header.
75 I, E, P,
S
number of user data
picture header
R/W 1 byte 0 Specifies the amount of user data to be
inserted into the picture header.
76 I, E, P,
S
user data picture
header
R/W 64 bytes all 0 Specifies the data to be inserted into the
picture header. If internal user data insertion
of Closed Caption data into the GOP header
is active and the GOP size is larger than 9,
then the insertion of user data to the picture
header is not available.
77 I, E, P,
S
noise filter
coefficients
R/W 2 bytes off Defines the noise filter coefficients gain and
criterion scale.
byte 0 gain
byte 1 criterion
78 I adaptive
quantization depth
R/W 1 byte 0 to 128 32 Selects the depth of quantization
adaptation; 0 for no adaptation, 128 for
maximum adaptation.