Setting Up Test Sources With Sis Commands - Extron electronics SSP 7.1 User Manual

7.
Left
Right
Center
Left Surround
Right Surround
Left Back
Right Back
Table 13.
8.
Setup with a Response Time Analyzer (RTA) Calibration Tool
1.
2.
3.
4.
5.
6.
7.
8.
9.

Setting up Test Sources with SIS Commands

Extron recommends that the SSP 7.1 Setup and Control Software is used to calibrate the system
with the test signals, see
system can be calibrated using SIS commands.
Using Pink Noise or Dolby Noise Test Signals
1.
2.
3.
4.
5.
6.
Compile the information into a table (if possible, use a spreadsheet program to carry out the
calculations automatically). An example, using typical values, is given below:
Speaker Measured Distance (ft)
Channel
12.00 (furthest speaker)
11.00
10.50
8.25
7.50
6.13
7.50
Calculating Speaker Delays for SIS commands
Use these SIS delay time values when entering SIS commands to compensate for speaker
delay where there are no lip sync effects (see
Pick an ideal central location on which all speaker output signals converge.
Place the microphone from the RTA at ear level in the convergence location.
Play the audio source. This can be an analog source, provided by the RTA, or a digital
source, provided by a test CD.
Use SIS commands to change the listening mode for the input signal to
necessary, configure the mono source to
.
Right
Use SIS commands to mute or unmute specific output channels.
Use the RTA to measure the outputs of each channel.
Calculate the speaker with the longest delay (normally recorded in ms)
Calculate the delay time (in ms) and the SIS delay time for each speaker and compile the
values in a table as described in
NOTE:
The RTA provides delay times in milliseconds, so there are no columns for
measured distance (feet) or delay (feet).
Use these SIS delay time values when entering SIS commands, to compensate for speaker
delay where there are no lip sync effects (see
Testing & Output Trim Tab
Send the SIS command that turns on the test source signal as pink moise (
E }
or Dolby noise (
X1TSTA
Send the SIS command that mutes all output channels (
Send the SIS command to unmute each output channel individually (
represents the number of the output channel).
The signal is output through the unmuted channel; the user can adjust speaker delay or
output trim and hear the test noise change in real time.
Mute the current output and unmute the next channel to test each output in turn.
To end the session send the SIS command that turns off the test source (
and the SIS command that unmutes all channels (
Delay (ft)
0.00
1.00
1.50
3.75
4.50
5.87
4.50
Speaker Delay Tab
, , or, if using an analog input,
Left Right
Two Person Setup (see page 82).
Speaker Delay Settings
on page 32. If this is not possible, the
).
).
1Z
).
0Z
SSP 7.1 • SIS Commands
Delay Time SIS Delay
(ms) Time
0.0 0
0.9 9
1.3 13
3.3 33
4.0 40
5.2 52
4.0 40
on page 29).
. If
Mono to All
Left +
on page 76).
E }
)
X2TSTA
X@ X@
where
*0Z
E }
X0TSTA )
83