Data tunneling via closed captioning

摘要

An example apparatus that processes DTVCC data has a demultiplexer that extracts DTVCC data packets from a DTV signal. A parser parses the DTVCC data packets by: passing normal DTVCC data to a CC decoder; detecting ancillary data in the DTVCC data packets; and separating the ancillary data from the DTVCC data for output to an ancillary data process. An apparatus that processes DTVCC data has an ancillary data packager that packages data ancillary to DTV data for insertion into the DTVCC data packets. A DTVCC data packager receives CC data into DTVCC data packets and packages the ancillary data together with the DTVCC data into DTVCC data packets. A multiplexer multiplexes the DTVCC data packets from the DTVCC data packager with non-CCDTV data to produce DTV signal data. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

主权项

1. A method of packaging ancillary data for digital television (DTV) content provider, the method carried out by the DTV content provider, comprising:
providing a digital representation of the video content; packaging closed caption data to form a part of the video content; and where the closed caption data comprises:
a data element that signifies the presence of ancillary data, where the data element comprises an undefined extended_service_number for the closed caption data, andthe ancillary data; and where neither the data element nor the ancillary data are displayed as closed caption data.