SAA6752HSSLASHV103 datasheet(21/71 Pages) PHILIPS

21 / 71 page

2004 Jan 26

Philips Semiconductors

Product speciﬁcation

MPEG-2 video and MPEG-audio/AC-3

audio encoder with multiplexer

SAA6752HS

7.3.8.3

Internal Closed Caption user data insertion

compliant to ATSC/NTSC standard

Automatic insertion of Closed Caption data into the user

data 2 area on picture header level compliant to the ATSC

and EIA-708 standard can be selected via the I2C-bus.

Closed Caption data, which is delivered from the video

input processor (e.g. SAA7114) and captured in the video

front-end will be inserted into the user data 2 area (picture

header level) of the video stream. Preconditions are

appropriate settings of the video input processor and the

VBI data extractor in the video front-end. The Closed

Caption user data will be written for both fields. If no valid

Closed Caption data for field 2 is available these data will

be marked as invalid in the stream. At SIF mode only

field 1 Closed Captions can be inserted from the video

input signal and dummy values (80H 80H) will be inserted

for field 2.

If extended data services (XDS data, line 21 field 2) are

inserted, the insertion will be transparent. No modification

of the CGMS-A copy information will be done.

In accordance to EIA-708 the Closed Caption data will

appear in the stream in transport order. If B-frames are

present the user data is re-ordered in the same way as the

video frames.

Advanced TV Closed Captioning (ATVCC) channel packet

data (cc_type 10 or 11) is not supported, because the

input signal of the encoder is an analog video signal, which

can carry only NTSC Closed Captions, but not ATV Closed

Captions.

No additional user data on picture header level can be

inserted if internal Closed Caption user data insertion

compliant to the ATSC/NTSC standard is active.

7.3.8.4

Internal Closed Caption user data insertion

compliant to DVD standard

Automatic insertion of Closed Caption data into the user

data area on GOP header level compliant to the DVD

standard can be selected via I2C-bus.

Closed Caption data, which is delivered from the video

input processor (e.g. SAA7114) and captured in the video

front-end will be inserted into the user data 1 area (GOP

header level) of the video stream. Preconditions are

appropriate settings of the video input processor and the

VBI data extractor in the video front-end. The Closed

Caption user data will be written for both fields. If no valid

Closed Caption data for field 2 is available these data will

be marked as invalid in the stream.

If extended data services (XDS data, line 21 field 2) are

inserted, the insertion will be transparent. No modification

of the CGMS-A copy information will be done.

The Closed Caption data will be inserted for each field of

the GOP in display order. At SIF mode only field 1 Closed

Captions can be inserted from the video input signal and

dummy values (80H 80H) will be inserted for field 2.

The user data is delayed by one GOP period. The first

GOP in the stream carries dummy data marked as invalid.

No additional user data on GOP header level can be

inserted if internal Closed Caption user data insertion

compliant to the DVD standard is active.

The amount of user data depends on the GOP size:

5 bytes header and 3 bytes/field are required. With the

maximum GOP size of 19 this results in

5+19

× 2 × 3 = 119 bytes, which is more than the

available array of 64 bytes for GOP user data. Therefore

the 64 byte array for picture user data is also used for GOP

user data, if GOP sizes larger than 9 are selected. Then all

128 bytes, which are available for user data insertion on

GOP and picture header level will be used for the insertion

of CC data on GOP level. In this case no additional user

data insertion on picture header level is possible.

7.3.9

MOTION ADAPTIVE NOISE REDUCTION

The gain and adaptivity can be controlled to optimize

encoding efficiency in case of noisy input sequences, i.e.

off-air reception.

SAA6752HS/V103 Datasheet(PDF) 21 Page - NXP Semiconductors

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