Sonifex DHY-03 Automatic Digital Telephone Balance Unit

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.