Information descriptor and extended information descriptor data structures for digital television signals
According to an aspect, there is provided a digital television (DTV) data stream including program and system information protocol (PSIP) data associated with content of the DTV data stream, the PSIP data including a virtual channel table (VCT) and an event information table (EIT), the EIT comprising: a source identification field identifying a source of an associated event in a DTV data stream; an event identification field indicating an identification of the event; a start time field indicating a star time of the event; a title field indicating a title of the event; and a descriptor comprising: a descriptor tag identifying the descriptor as a genre descriptor, a descriptor length indicating a total length of the descriptor; and at least one category code for an associated event in a DTV data stream, each category code specifying genre, program type, or category information of the associated event, wherein the at least one category code specifies at least one of a set of basic categories.
1. A digital television (DTV) transmitter to transmit digital broadcast data, the DTV transmitter comprising:
a Program and System Information Protocol (PSIP) generator that generates a PSIP table for transmitting in a DTV stream;
a transmitter that transmits the DTV stream including the PSIP table to a DTV receiver, the PSIP table containing a virtual channel table (VCT) and an event information table (EIT), the EIT carrying a program schedule for a virtual channel, the EIT including a genre descriptor and a caption service descriptor, the genre descriptor comprising:
a descriptor tag field identifying the descriptor as a genre descriptor;
a descriptor length field, which is an 8-bit unsigned integer, specifying a length, in bytes, of fields which immediately follow the descriptor length field to an end of the genre descriptor, wherein the fields include:
a category selection code, the category selection code being an attribute code value for an associated event in the DTV stream, the attribute code value specifying a basic genre or category type or detail attribute for the associated event in the DTV stream, and the attribute code value matching a value for the basic genre or category type or detail attribute in a categorical genre code assignments table defined in Advanced Television Standards Committee (ATSC) A/65 standard; and
wherein the genre descriptor accommodates a plural attribute code values such that the transmitter transmits the plural attribute code values sequentially without intervention, and each attribute code value is defined in the categorical genre code assignments table that is ordered from basic genre or category type to detail attribute, and the genre descriptor references entries in the categorical genre code assignments table, and when a plurality of attribute code values are included in the genre descriptor, the basic genre or category type or the detail attribute code values are specified by 8-bit unsigned integer and at least one attribute code value is specifying a basic genre, and wherein the EIT covers a three hour period and the VCT includes a major channel number field and a minor channel number field.
2. The DTV transmitter of claim 1 , wherein the basic genre or category type attribute comprises at least one of education, entertainment, movie, news, religion, and sports.