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•
PC CID SID
18
1444645043
155
9020
The PC CID SID is the decrypted SID component of the 24-byte PC Content ID.
Under ideal conditions, the PC CID SID identifies the SID of the last PC watermark
listed among the EDUs of the current ID3 tag. It takes the PCM-to-ID3 SDK 10
seconds or more to "latch onto" the proper PC SID. As a result, the PC CID may be
inaccurate (or set to 0) for 10–20 seconds after a SID changes or disappears.
In the snippet above, the PC CID SID may be set to 0 (or to the value of the previous
PC SID) for two or three tags after the Watermark PC SID changes to a new value.
The "Comments" field usually reports such PC CID SID mismatches. Table 7 shows
such a Comment. Ignore them if they fall within three rows of a changing PC SID.
•
PC CID Timestamp
18
1444645043
155
9020
The PC CID Timestamp is the decrypted timestamp component of the 24-byte PC
Content ID.
Under ideal conditions, the PC CID timestamp is a raw NAES 2 timestamp that
translates to the start of the current broadcast day (3 a.m. in the time zone where the
NAES encoder was operating). If the PC CID SID is set to 0 or is inaccurate, ignore
the PC CID timestamp.
All CID timestamps are derived from the watermarks to which the PC CID SID
corresponds. They are not derived from the "current time" that your application
supplies to the PCM-to-ID3 SDK.
•
PC CID Offset
18
1444645043
155
9020
The PC CID offset specifies the number of seconds that separate the PC CID
timestamp and a representative Watermark PC Timestamp for the current tag. Note
that all timestamps are translated to NAES 2 format before any calculations are
made. Ideally:
In the snippet above from the Comma-Delimited Tag Listing in Table 7, note that, for
sequence number 18:
o
o
Therefore,
o
o
Release 1.8 Revision F
2800909011
9020
2800851248
2800909011
9020
2800851248
2800909011
2800851248
9020
(<PC CID timestamp> + <PC CID Offset> - 10) <= Watermark PC
Timestamp <=
(<PC CID timestamp> + <PC CID Offset> + 10)
2800851248
PC CID TS =
57763
PC CID Offset =
2800909011
PC CID TS + offset =
Watermark PC timestamp =
57763
9120
2800909007
57763
9120
2800909007
57763
9120
2800909007
(calculated)
2800909011
52
ID3 Tag Validator Application User Manual
9120
2800851248
57759
9120
2800851248
57759
9120
2800851248
57759
Nielsen Confidential
168
168
168
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