3M G5 - Dealing with Delay;Echo; M Drive-Thru Systems Model G5 and Model Xt; March 2014 - Revision

Appendix: Best Practices
3M™ Drive-Thru Systems Model G5 and Model XT-1
Installation Manual
March 2014 – Revision 2.0
Page 63 of 74
Dealing with Delay/Echo
During the first ½ second of each order, there is a delay while the Order Taker
starts to speak. If the Delay lasts more than a ½ second, follow the flowchart
(Figure 20) below. You may also experience a delay if a vehicle at the order
point moves while the order is taking place; this usually happens at the end of a
call while the order taker tells the customer the total.
Figure 19
Is PreAmp = 8
Is Echo
Canceller set
to Med ?
Echo/Delay Cancellation Flowchart
System with Echo/ Delay
Yes
No
No
No
No
No
No
No
Increase Echo
Canceller by 1
level up to Med
Note: System Optimized
for the 3M Mic
Set PreAmp to 8, if
using the 3M Mic.
Did Echo
Disappear?
Adjust volumes to
reasonable levels
Are volumes
reasonable at the
order point?
Not a Base
Station Setup
issue
System working
without Echo/Delay
Did Echo
Disappear?
Has the Order point
been properly
acoustically treated?
Acoustically
treat/isolate Mic.
And Spkr as needed
Replace Mic., Spkr
or cable
New Mic, Spkr,
Cable?
Note: Need to eliminate mechanical or
internal order point coupling. I.E. Mechanical
vibrations from the speaker or sound from
within the order point is passing into the
microphone. This needs to be prevented by
isolating within the order point. Acoustical
foam can be used to do this.
Note: Concentrate on
outbound volume level, if it
is too loud it may cause the
system to Echo or Delay.
Yes
Yes
Yes
Yes
Yes
Yes