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Readings page 37
In a broadcast stream there is no “pause.” When a program is paused
the time is occupied by a commercial or other interstitial content. The
loudness of these interleaved segments is just as important, possibly
more so, as the program. However, the way the loudness measure-
ments are defined it is not possible to measure the individual pieces of
a program separately, the measurement must be paused and measure-
ment must resume when the break is over. Therefore to measure both
the program and the commercial loudness independently requires two
loudness meters, one for the program and one for the commercials. The
control lines for these two meters must be interconnected so that they
operate synchronously.
Dual Stream™ loudness measurement is Qualis Audio’s patent pend-
ing solution to this problem. The Sentinel is designed to handle a pro-
gram stream with interleaved commercial segments. When the instru-
ment is told that the program being monitored has gone to commercial
it pauses the program measurement. However, it continues measuring
and allocates the measured energy to a separate results buffer for the
commercial. When the instrument receives a reset command it finalizes
the readings and begins measuring another commercial. If instead it
is told that the stream has returned to the original program it finalizes
the commercial loudness reading and resumes measuring the program
exactly as a conventional meter coming out of pause would do. When
the program is complete, assertion of the reset command will finalize
the program measurement and the instrument will immediately begin
making a new measurement of program loudness.
These program and commercial loudness measurements are dis-
played, logged and reported, along with the program/commercial iden-
tifier, the time and the timecode. Each measurement is compared to the
specified loudness limits and alarms are issued if required.