Operation In Receive Mode - Tait TM9100 Service Manual

2.5

Operation in Receive Mode

This section describes the functioning of the transceiver in receive mode.
Overview
The operation of the transceiver is illustrated in
(analog mode) and
These block diagrams show the hardware modules integrated with the
software modules:
Note
The receive path consists of three major functional parts:
Note
TM9100 Service Manual
© Tait Electronics Limited August 2005
Figure 2.13 on page 49
hardware (transmitter, receiver, CODEC and audio)
RISC processor (on FPGA of digital board)
custom logic (on FPGA of digital board)
DSP (on digital board)
The block diagrams for the analog and digital modes only differ in
the operation of the DSP.
RF hardware
digital baseband processing
audio processing and signaling
The information flow on a digital radio can be categorized in two
forms, signaling (including user data) and voice. Whilst setting up
a call, signaling may be the only information transferred across the
air interface. Once a call has been established however, both sig-
naling and voice information are transported. The signaling infor-
mation continues throughout the call for the purpose of maintain-
ing the call and possibly sending data information.
Figure 2.12 on page 48
(digital mode).
Description 47