User's Manual
UM-D-010
DA14AVDDECT System Overview
NDA Confidential
User Manual
Revision 1.2
20-Aug-2020
CFR0012
10 of 18
© 2020 Dialog Semiconductor
7.2 Public Address System
Figure 5 shows the high level block diagram of the Public Address system that can connect up to 4
PPs to FP at the same time. The setup shown in Figure 5 requires DQPSK modulation (or higher).
The default example application uses DQPSK modulation where 4 PPs can connect to FP.
PP encodes and transmits audio with a CELT codec and either the mixed audio will be output on
analog output or audio from each PP will be output over separate PCM channels on FP.
It is possible to exchange a small amount of data between FP & PP.
Figure 5: Public Address System
7.3 Voice Conferencing System
Figure 6 shows the high level block diagram of the Voice Conferencing system where up to 8 PPs
can join a call. Audio is supported on FP, so 9 parties can participate in total.
The setup shown in Figure 6 requires DQPSK modulation (or higher) and a BV32 codec for a
wideband call, which is the default setting in the example application.
Intercom connections are also possible up to 8 PPs (4 intercom calls). When both intercom
connections and a conference call are required, the system will support a total number of 8 PPs (for
example: 2 intercom calls and one conference call with 4 PPs).
FP
PP
PP
… 1 to 4 transmitters …
PP
PP
32 kHz sampling rate
16 kHz Audio BW
Analog or PCM (TDM)
Analog or I2S