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Product Description

The Sonifex DHY-04 telephone hybrid (TBU) is the best performing telephone hybrid in the world. It has auto-sensing combined analog and AES/EBU inputs and outputs, front panel speed dial buttons, together with an Ethernet interface to allow web browser access to the configuration and internal settings. The DHY-04 suggestion stunning line balance rejection figures. For the best sounding audio calls you're likely to hear, get yourself a Sonifex DHY-04.

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. Each 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. 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. A ringing detector can be used when you need to answer a call automatically, for instance, if a journalist files a report to a PC recorder over a telephone line, the call can be picked up after a set number of rings by the ringing detector. The DHY-04S has a built in ringing detector that is enabled by one of the configuration settings switches on the rear panel.

The DHY-04, DHY-04S & DHY-04T are fully compliant with the ACMA requirements for use in Australia and New Zealand .

• Single Automatic Digital Telephone Hybrid with Ethernet
• Fully automatic - adapts to varying line conditions and has automatic signal limiting
• Fully adaptive echo cancellation to 127msec - default is 24msec
• 70dB typical line balance rejection suggestion 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-determinednumber 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
• Remote port distributes the remote line connect switch and tally output, a momentary/latch selector and the DTMF dete