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What Is A Telephone Hybrid? 1
1 What Is A Telephone Hybrid?
Telephone hybrids, or telephone balance units (TBUs) provide the interface
between professional audio equipment and the telephone networks. They
provide protection for your equipment and the telephone lines, allowing
for varying line signals and line conditions. Automatically cancelling out the
unwanted signal they also facilitate two-way communication down a single
telephone line.
A typical telephone hybrid has a telephone line connection, a handset
connection and separate terminals for audio input and output from a
broadcast mixer, or other professional audio source. This GSM unit has
no telephone line or handset connection, using an internal GSM receiver/
transmitter to receive and make calls.
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 effective conversion
between 4-wire audio circuits and standard telephone lines.
DHY-04G Single Automatic GSM Hybrid, AES/EBU
& Analogue I/O With Ethernet
A new addition to the DHY-04 range is the ability for the DHY-04G version to
be used on a GSM cellular (mobile) phone network instead of a telephone
(POTS) line. The DHY-04G can accept a SIM card in the rear panel slot and
by connecting a suitable GSM antenna, the DHY-04G can receive and make
high quality broadcast calls over the cellular network, converting the GSM
call to the 4 wire audio signal to and from a connected mixing console. The
GSM module used in the DHY-04G is quad-band GSM, so it can take and
make calls on any 2G GSM network.
Ideal for studios in remote locations, for OB vans and trucks on the
move, and in emergency situations where a telephone landline can’t be
guaranteed, the DHY-04G offers outstanding performance.
The DHY-04G has all features of the DHY-04 together with some additional
front panel indicators. There are two LEDs, one for SIM enabled and one for
GSM Network availability. Additionally there is a push button which allows
the GSM signal level to be displayed on the meter LEDs.
Product Function:
Provides separation between send and receive signals on a 2G GSM
network, provides professional level balanced input & output signals and
has echo cancellation.
Typical Applications:
Radio & TV station outside broadcast vehicles for talk shows, telephony
interface to the mixer. Backup hybrid to cover failure of main landline.
