Call recognition, Call generation, Voice recognition – Procom USE2.OB User Manual

Page 4: Data sheet, Use2.ob

Data Sheet

USE2.OB

Interface Attachment for Local Battery Telephony

Call Recognition

The attachment, call recognition, receives the incoming dialling information.
The dialling information is galvanically separated and adapted through an opto-
coupler, passed to the microcontroller (control unit) and there processed.

Call Generation

The attachment, call generation, is switched through relay contacts over the LB
line and generates the dialling pulses controlled by the processor.

Voice Recognition

The attachment, voice recognition, is used by the microcontroller to determine the
presence of voice signals. Voice signals detected inside a time window cause the
connection to be maintained. If there is no speech inside of the time window then
the connection is terminated.
Sensitivity and time can be configured using the ICS software.

Codec + Filter

The main component of the codec/filter attachment is a programmable PCM co-
dec/filter building block. Using this the sending and receiving level can be config-
ured. It also suppresses the return transmission of the voice signal of the dialogue
partner. This is realized through a configurable filter unit and out-of-phase over-
loading of the return channel. This effectively prevents feedback.
The sending and receiving level as well as the filter values can be configured us-
ing the ICS software.

Date:

23.03.2009 Page:

4/6

Author:

Document-No.:

DB_USE2.OB_2730_1