Figure 4-5 – Dolby Laboratories DP570 User Manual

Page 44

Dolby

DP570 Multichannel Audio Tool User’s Manual

Using the DP570 Features

Measuring and Setting the Dialogue Level

This process allows you to accurately estimate the average level of all of the individual
dialogue sections.

The term representative section indicates a shorter section of the program being measured
that contains spoken dialogue levels that are representative of the speech levels found
throughout the entire program.

Infinite mode is most often used in ingest, QC, and postproduction applications where
audio metadata is being authored, the whole piece of content is available, and levels can
usually be controlled and/or adjusted. Infinite mode should be used in automated and
semi‐automated applications.

Using Short-term Measurements

Short‐term measurement mode displays the Leq(A) measurement value for only the
previous ten‐second period. For example, the first measurement value is for the time
interval between 0 and 10 seconds, the next between 1 and 11 seconds, next between 2 and
12 seconds, and so forth. Figure 4‐5 illustrates these measurements.

Figure 4-5

Short-term Measurements

Since the short‐term measurement considers only the previous ten seconds of program
material, the measured value can be much more dynamic than the measured value in
Infinite mode.

The benefit of short‐term measurement is that it allows the operator to see short‐term
variations in loudness level within a program. Many skilled audio operators prefer to use

The energy average of two or more quantities expressed on a decibel scale differs from the arithmetic average of
the quantities. The DP570 Pause feature allows the user to properly average measurements (in dB) across multiple
sections of programming.

Note: In programming that includes heavy dynamics processing, and therefore a smaller

dynamic range, the shortterm may not be considerably more dynamic than the
infinite.

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