34 Description TP9100 Service Manual
© Tait Electronics Limited May 2005
2.5 Operation in Receive Mode
This section describes the functioning of the transceiver in receive mode.
The operation of the transceiver is illustrated in simplified block diagrams in
■ Figure 2.6 on page 35 (analog mode)
■ Figure 2.7 on page 36 (digital mode)
These block diagrams show the hardware modules integrated with the
software modules:
■ hardware (transmitter, receiver, CODEC and audio)
■ RISC processor (on the FPGA of the digital circuitry)
■ custom logic (on the FPGA of the digital circuitry)
■ DSP (on the digital circuitry)
Note The block diagrams for the analog and digital modes only differ in
the operation of the DSP.
The receive path consists of three major functional parts:
■ RF hardware
■ digital baseband processing
■ audio processing and signaling
Note 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.
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