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 cancelling 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 effective conversion between four-wire audio circuits and
standard telephone lines. Built to a very high specification, the DHY-03 is simple to install and automatically adapts to line conditions and programme content.
The Digital DHY-03 Telephone Hybrid is probably the best
performing digital hybrid in the world, with simply stunning line balance
rejection figures. For the best sounding audio calls you’re likely to hear, you
should specify the DHY-03.The DHY-03 is a high quality digital telephone hybrid, which
is suitable for most general telephony applications and is often used in radio and TV
stations, bingo halls and dealing floors. The digital DHY-03 telephone hybrid is the
replacement for the DHY-02, which for many years has set the standard as an excellent value, high
quality telephone hybrid. The DHY-03 can be used for any application where a clean
telephone signal is required and the line is not subject to excessive delay.
The DHY-03 has the following features :
Fully automatic - adapts to varying line conditions and has
automatic signal limiting.
Fully adaptive echo cancellation to 127msec - default is
24msec.
76dB typical line balance rejection offering superb
performance and crystal clear audio.
Front panel input and output gain controls.
Front panel LED metering of receive and send signals.
Built-in conferencing for 2 hybrids, so that a single telco
channel on a mixing desk can receive 2 calls.
Integrated ring detector - automatic call answering after a
pre-determined number of rings.
Automatic call disconnection. Fitted with K-break, line
polarity reversal and dial tone disconnect detection, defined by the country
selection.
Automatic ducking facility allows the talent to
‘shout-down’, or talk over, a caller by reducing the gain of the caller’s
signal if it goes above a certain level.
Local and remote line hold switching - calls can be remotely
switched through a mixing console.
Line hold/release button to control line hold circuit,
illuminates to indicate the status of the line and flashes to show ring status.
DTMF tone recognition allowing a opto-isolated GPI output to
be made on receipt of selected DTMF tones, e.g. for starting a studio
automation recorder automatically to record a remote telephone interview.
International operation with built-in configurable settings
for each country. Country selection allows the unit to provide line impedance
and a simulation circuit to match the country.
RS232 serial port for remote control of the TBU, DTMF tone
dialling and firmware upgrades to add new country settings.
Remote port distributes the remote line connect switch and
tally output, a momentary/latch selector and the DTMF detect output.
The remote line connect switch can be either momentary or
latching in its action.
Balanced mic/line input - 10k balanced input selectable for
0dBu clean feed line, or microphone level with adjustable gain.
Balanced output - 0dBu low impedance balanced output, with
output gain settings.
Record output - the conferencing output can be set via a
jumper to give a mix of the caller and mic/line input signals for recording
both sides of the telephone conversation.
Line limiter, bandpass filter and output noise gate with
preset threshold providing low distortion audio.
Built in universal power supply between 90V AC and 250V AC,
47-63Hz, IEC mains input.
ETSI approval compliant with European PTT specifications.
Front Panel features :
Rear Panel features :
Which Format Is Most Suitable ?
The DHY-03 analogue hybrids are available in three models :
DHY-03 Single free-standing automatic digital TBU.
DHY-03S Single 19” rack mounted automatic digital TBU.
DHY-03T Twin 19” rack mounted automatic digital TBU.
Specifications:
This product has settings that can be adjusted using the Sonifex SCi (Serial Control Interface) software.