3
Operating Instructions
Overview
The BSS Audio BLU-HIF Telephone Headset Interface facilitates connection of the
headset jack of a VoIP/digital phone to an AEC input and analog output of a Soundweb
London device. The BLU-HIF therefore allows the VoIP/digital phone to be used as the
dialing interface and hybrid for a conference system. This simple interface eliminates the
programming requirements associated with third-party control systems, while providing a
familiar and low-cost dialing interface to the end user.
Connections
Audio Tx
This balanced connection is for sending near-side audio. Connect it to a standard analog
output of a Soundweb London device. See Figures 1 and 2 for system connection and
DSP configuration diagrams.
Audio Rx
This balanced connection is for receiving far-side audio. Connect it to an AEC input
on a Soundweb London device. See Figures 1 and 2 for system connection and DSP
configuration diagrams. While the BLU-HIF provides substantial isolation of the Rx and Tx
signals, near-side audio will still be heard on the Rx channel due to the presence of side-
tone. As such, BSS Audio recommends always feeding the Rx channel to an AEC input, as
opposed to a standard analog input. The AEC algorithm will remove the side-tone.
The Audio Tx and Rx connections are via Klippon pluggable terminal block connectors
(also known as BL, Phoenix or Combicon). 6-way female Klippon connectors are supplied
for making these connections.
Soundweb products provide cable shielding ‘back from the destination’ to eliminate
ground loop problems. This means that the shield (S) connection on an input is grounded,
whereas the shield connection on an output is floating (although connected via an
internal network to ground for EMC compliance).
BLU-HIF Front
BLU-HIF Side
