User's Manual

UM-D-010

DA14AVDDECT System Overview

NDA Confidential

User Manual

Revision 1.2

20-Aug-2020

CFR0012

9 of 18

7 System Overview

This chapter shows the high level block diagram of three different systems, which are based on the

SW profiles listed in Section 5. The default settings of the example Cola application are used for the

block diagrams.

7.1 Tour Guide System

Figure 4 shows the high level block diagram of the Tour Guide system where FP is broadcasting

audio up to 1024 PPs. Audio is encoded and transmitted by FP with a CELT codec. The following

connections are possible in this setup, which are fully under the control of the user application:

● broadcast audio channel (to all PPs) that FP can mute and unmute. A small amount of data can

be sent via the broadcast connection (to all PPs)

● "keep-alive" connection that is a regular service connection to monitor if at least 1 PP is

connected (mandatory in DECT when broadcasting). A small amount of data can be exchanged

between FP and PP with the use of the service connection.

● "question call" is a wideband voice connection (G.722 codec) that one of the PPs uses to talk to

FP after the voice connection is established (components marked by a dashed line in Figure 4

are needed). The conversation between FP & PP is broadcasted to all other PPs unless FP

mutes the broadcasted audio to keep the conversation private. A small amount of data can be

exchanged between FP & PP with the use of this connection.

Figure 4: Tour Guide System

Broadcast

channel

48 kHz sampling rate

20 kHz Audio BW

Analog or I2S

… 1 to 1024 receivers …