Atsc working Draft Template
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- Operators used within Table 6.17
- Case: Unconditional Channel Change ( dcc_selection_type = 0x00)
- Case: Numeric Postal Code ( dcc_selection_type = 0x01, 0x11)
Table Legend and Notes
D = DCC Selection ID data: data sent within the dcc_selection_id field. U = User-entered DCCRR data: data stored in non-volatile DCCRR memory that is entered by the user to establish the user's selected choices. S = Specification mask indicating validity of U (i.e. user has entered a value for U): data stored in non-volatile DCCRR memory that indicates that a user has specified a choice for the associated data item. Note: Items marked with an asterisk (*) above are required within a DTV device providing minimal support for Directed Channel Change within the United States. Operators used within Table 6.17: & bitwise AND == equal to ~ 1's complement (bitwise inversion) != not equal to 54 ATSC A/65:2013 Program and System Information Protocol 7 August 2013 dcc_selection_id – This 64-bit unsigned integer contains the data identified by the dcc_selection_type field, and is described below. Note: 8 bit characters specified for use within this section shall mean characters defined in ISO/IEC 8859-1 (ISO Latin-1) [11]. Case: Unconditional Channel Change ( dcc_selection_type = 0x00) If the dcc_selection_type is specified to be of type “unconditional” (0x00), the dcc_selection_id shall be 0x00 and the DCCRR shall unconditionally switch to the DCC To Channel Number if the current time is within the interval bounded by dcc_start_time and dcc_end_time . Case: Numeric Postal Code ( dcc_selection_type = 0x01, 0x11) If the dcc_selection_type is specified to be of type 0x01 or 0x11, the dcc_selection_id shall consist of a right-justified five numeric 8-bit character postal code field in the range of 00001 to 99999 padded on the left with ‘0’ (0x30) characters. The DCCRR shall compare that value to a stored representation of a numeric postal code entered by the user from setup menus within the DCCRR to determine if there is a match. If a question mark (“?” or 0x3F) character appears in any of the five least significant numeric character positions, that position shall be considered to be a wild card which will permit a selection on any numeric digit within that position. For example 00055?98 would permit matches on 00055098, 00055198, 00055298, 00055398, …, and 00055998. Similarly, 00055??8 would permit matches on 00055008, 00055018, 00055028, …, 00055108, 00055118, …, and 00055908, 00055918, …, and 00055998. Note that multiple numeric postal code specifications may be made within a single DCCT by means of the dcc_term_count loop. If the dcc_selection_type is defined to be of type 0x01, the term shall evaluate True if the numeric postal code (with evaluated wild cards if any) given in the dcc_selection_id matches the stored numeric postal code entered by the user and False otherwise. If the dcc_selection_type is defined to be of type 0x11, the term shall evaluate True if the numeric postal code (with evaluated wild cards if any) given in the dcc_selection_id does not match the stored numeric postal code entered by the user and False otherwise. Download 4.82 Kb. Do'stlaringiz bilan baham: |
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