Current standard: IEEE 1278.1
Encoding Scheme Record
Size: 16
Description: This field shall specify the encoding used in the Data field of this PDU. The Encoding Scheme shall be composed of a 2-bit field specifying the encoding class and a 14-bit field specifying either the encoding type, or the number of TDL messages contained in this Signal PDU (see Table 57)
Table 57--Encoding Scheme
Bits 14-15 Bits 0-13
Encoding Class Encoding Type or Number of TDL
Messages
The two most significant bits of the encoding scheme shall enumerate the following encoding classes. The valid values of encoding classes are enumerated in Section 9 of EBV-DOC.
The fourteen least significant bits of the encoding scheme shall represent encoding type when the encoding class is encoded audio. The valid values of encoding type are enumerated in Section 9 of EBV-DOC.
The fourteen least significant bits of the encoding scheme shall be zero when the encoding class is not encoded audio and the TDL Type (see 5.4.8.2(e)) is zero.
Otherwise, the fourteen least significant bits of the encoding scheme shall represent the number of tactical data link messages contained in the data section of the Signal PDU.
A special requirement applies to the choice of encoding scheme when analog modulated audio communication is simulated. The sample rate is in samples per second for audio data. The bit rate is in bits per second for digital data. The interpretation of the Data field of the Signal PDU shall depend on the value of encoding class, as specified in 5.4.8.2 (i).
Record Components:
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