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LDP-8242 User Manual (Iss. 03) Operating Instructions • 3–41
Audio Loudness Dual Metering
Provides an ITU-R BS.1770-1 / ATSC A/85 Audio Loudness
measurement of two independent 5.1-channel groups (L, R, C, LFE, Ls,
and Rs). If desired, the independent meters can be set to provide pre and
post-processing assessments of the same program material.
Note : This function provides only loudness metering as described here; this function does not provide active loudness correction.
Selected channels are only monitored by this function, with no affect on the channels.
Loudness Meter 1 / Meter 2 Source
Channel Selection
For Meter 1 and Meter 2, separate drop-down lists for each loudness
meter source (input) channel as listed below.
• Bus Ch1 thru Bus Ch 16
• Upmix L, R, C, LFE, Ls, Rs output channel
• Loudness Processor L, R, C, LFE, Ls, Rs output channel
• Tone 1 thru Tone 8
• Silence
Note : Source input channels include drop-downs for L, R, C, LFE,
Ls, Rs, Aux 1, and Aux 2 channels. LFE, Aux 1, and Aux 2 channels
are not included in loudness measurements.
On cards equipped with multiple upmixers and/or loudness
processors, drop-down choices are identified by function, processor
designator, and channel (e.g., “LP51 A Ls” denotes 5.1-channel
loudness processor A, left surround (Ls) channel output).
Set any unused channel inputs to Silence.
Measured Loudness Display Dual displays for Meter 1 and Meter 2 that show respective current
aggregate ITU-R BS.1770-1 loudness for the selected monitored
channels.
Note : -inf LUFS display indicates loudness meter is not receiving any
input (for example, as in the case of wrong (muted) channels being routed
to meter instead of intended channels).
•
•
In this example, 5.1-channel
selections in
Meter 1 and
Meter 2 are respectively used
for loudness pre-processed
channels from a card
Upmixing function, and
loudness post-processed
channels from a card
5.1-channel loudness
processor. The respective
Measurement displays show a pre-processed short-term loudness of -11.3 LUFS, and a post-processed short-term loudness of
-23.0 LUFS, with both measurements being within reasonable ranges and as expected.