1、SMPTE 341 M-2000 SMPTE STANDARD data-type-dependent value for Television - Caption data Davload format Format for Non-PCM Audio and Data in AES3 - Captioning Data Type I 2-3 1 Page 1 of 2 pages distribution packet Rece rved 1 Scope This standard specifies data type specific format re- quirements for
2、 caption data bursts carried within an AES3 interface according to SMPTE 337M. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards
3、 are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. EIA-708-B-1999, Digital Television (DTV) Closed Captioning SMPTE 337M-2000, Television - Format for Non- PCM
4、Audio and Data in an AES3 Serial Digital Audio Interface SMPTE 338M-2000, Television - Format for Non- PCM Audio and Data in AES3 - Data Types 3 Preamble The data-type shall be set to 29. Multiple formats of captioning data may be supported by this data type. The exact format of the captioning paylo
5、ad depends on the value of the data-type-dependent field. The data-stream-number shall be set to any number other than 0x7. The data-mode parameter shall be set to a value of O (16-bit mode). 3.1 Caption data-type-dependent field The burstjreamble for a caption data burst shall set the data-type-dep
6、endent value to match the format of the caption data payload (see table 1). Table 1 - Value of data-type-dependent value for captioning data O I Reserved I EIA-708-B caDtion 3.2 Caption data payload Multiple formats of caption data may be carried. The following clause specifies payload formats that
7、have been defined for carriage in this standard. 3.2.1 EIA-708-B caption distribution packet (data-type-dependent = 1) When the data-type-dependent value = 1, the cap- tion data payload shall be formatted in the form of a caption distribution packet as specified in EIA-708-B. There shall be exactly
8、one caption distribution packet carried in a single payload. Copyright 8 2000 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved April 6,2000 Corrected November 21,2000 SMPTE 341 M-2000 Annex A (informative) Bib1 iog rap hy AESS-1992, Digital Audio Engineering - Serial Transmis- sion Format for Two-Channel Linearly Represented Digital Audio Data Page 2 of 2 pages
