Section 10: GSM
T
ieline
Page
88
T E C H N O L O G Y
10.10.1.
Default Settings for GSM Voice Calls
When using GSM voice mode it operates using the same Phone Coupler
circuitry that is used by POTS
Line 2 COUPLER
on the rear panel of the
codec. By default, a voice call is sent to a codec’s encoders as per the
connection profile loaded into the codec. This is a very useful way of
integrating voice calls into a broadcast and sending the composite program
signal to the studio encoded. The program matrix in this situation is as
displayed in the following image.
Figure 23: Phone Audio Routed to Encoder
As displayed in the right-hand image, phone
audio by default is routed to the
Send
section of
the matrix.
You may recall that the
BALANCE
knobs on
T
ieline
codecs control the balance between the
SEND & RETURN
audio sent to the codec
headphone outputs. The
Mix (Send/Return) Pan
Matrix
provides the flexibility of selecting which
sources are allocated to
SEND
and
RETURN
.
The audio balance between the
Decoder
audio
monitored (via
Return
) and the inputs (via
Send
)
can be controlled via the
BALANCE
knob on a
T
ieline
codec. (Related Topic: Operation of the I-
Mix G3 Phone Coupler)
Important Note:
This control does not affect the level of the transmitted or
received program audio. It only controls the monitoring of these sources in
the headphones.
