Specifications

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HY-03 User Handbook
What is a Telephone Hybrid?
Telephone hybrids (or telephone balance units, TBUs) provide the interface between
professional audio equipment and the public telephone network. They provide protection
for your equipment and the public telephone lines, allowing for varying line signals and line
conditions. Automatically canceling out the unwanted signal they also facilitate two-way
communication down a single telephone line, converting the two-wire telephone signal to a
four-wire send and return signal to be linked to a studio mixer, for example.
The hybrid has a telephone line connection and separate terminals for audio input and
output from a broadcast mixer, or other professional audio source.
A large proportion of Sonifex hybrids are used in radio and television broadcasting
applications for allowing external callers to be connected to the studio mixing console.
Most of the other units are supplied to communication operations for allowing extremely
eective conversion between four-wire audio circuits and standard telephone lines.
Built to a very high specication, the HY-03 is simple to install and automatically adapts to
line conditions and programme content.
Integrated Ringing Detector
Ringing detectors can be used when you need to answer a call automatically, for instance,
if a journalist les a report to a tape recorder over a telephone line, the call can be picked
up after a set number of rings by the ringing detector. The HY-03 has a built in ring detector
that is enabled by one of the conguration settings switches on the rear panel.
Available Formats
The HY-03 analogue telephone hybrids are available in three dierent formats, each with its
own approved, internal power supply :
HY-03 & HY-03 US Automatic analogue TBU with ringing detector, free standing
Figure 1-1 : HY-03 & HY-03 US Front & Rear
INTRODUCTION
INTRODUCTION
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