Setup With A Real Time Analyzer (Rta) Calibration Tool; Compensating For Lip Sync Offset - Extron electronics SSP 7.1 User Manual

Configuration and Control, cont'd

Setup with a Real Time Analyzer (RTA) calibration tool

1. Pick an ideal central location on which all speaker output signals converge.
2. Place the microphone from the RTA at ear level in the convergence location.
3. Play the audio source. This can be an analog source, provided by the RTA, or a
4. Use SIS commands (see chapter 6) to change the listening mode for the input
5. Use SIS commands to mute or unmute specific output channels.
6. Use the RTA to measure the outputs of each channel.
7. Calculate the speaker with the longest delay (normally recorded in ms)
8. Calculate the Delay Time (in ms) and the SIS Delay Time for each speaker and
N The RTA provides Delay Times in ms, so there will be no columns for Measured
9. Use these SIS Delay time values when entering SIS commands, to compensate

Compensating for Lip Sync Offset

Processing video signals often introduces delays to the video signal, relative to the
audio signal. Lip Sync Offset is used to delay the audio signals to every output
channel to resynchronize the audio and video signals.
N When compensating for both speaker delays and Lip Sync offset, calculate the
The following table uses the same individual speaker delay values from the table
on page 6-15 but also introduces a 10 ms delay to compensate for Lip Sync effects.
These SIS Delay Time values (in units of 0.1 ms) must be used with SIS commands,
when compensating for speaker delays and/or Lip Sync offset.
6-16 6-16 SSP 7.1 • Configuration and Control
digital source, provided by a test CD.
signal to "Mono for All". If necessary, configure the mono source to Left, Right,
or, if using an analog input, Left + Right.
compile the values in a table as described in the "Two person setup" section on
the previous page.
Distance (ft) or Delay (ft).
for speaker delay where there are no Lip Sync effects (see Speaker Delay Settings
on page 6-9).
individual speaker delay times first and then add a constant Lip Sync offset to
each speaker.
Speaker Delay Time
Channel (ms)
Left 0.0
Right 0.9
Center 1.3
Left Side 3.3
Right Side 4.0
Left Back 5.2
Right Back 4.0
Lip Sync Total Delay
offset (ms) Time (ms)
10.0
10.9
11.3
10.0 13.3
14.0
15.2
14.0
SIS Delay
Time
100
109
113
133
140
152
140