User manual

Digital Interface Tester
4-126
AM700 Audio Measurement Set User Manual
Table 4-1: Subframe Time Slots
Time Slots Information Carried
0 to 3 One of the three permitted preambles (X, Y, or Z)
4 to 27 Audio sample word in linear twos complement. The
most-significant bit (MSB) is in time slot 27.
When a 20-bit coding range is enough to carry the
audio signal representation, time slots 8 to 27 are
used for that purpose with the LSB in time slot 8.
Time slots 4 to 7 (auxiliary bits) can then be coded to
carry different data.
Unused LSBs are set to logic 0.
28 Validity bit associated with the audio sample word.
29 1-bit user data associated with the audio channel
transmitted in the same subframe.
30 1-bit channel status information associated with the
audio channel transmitted in the same subframe.
31 Parity bit. Set such that time slots 4 to 31 inclusive
will have an even number of ones and an even
number of zeros (even parity).
NOTE: Preambles have even parity as an explicit
property.