DHY-03 Range
Telephone hybrid with automatic operation
A high-performance broadcast telephone hybrid delivering crystal-clear audio with 76dB line balance rejection, fully automatic operation, and advanced echo cancellation.
DHY-03 Range
Telephone hybrid with automatic operation
Designed for broadcast and professional audio environments, this telephone hybrid delivers exceptional clarity and control, ensuring consistently high-quality call handling in even the most demanding applications. With an impressive 76dB typical line balance rejection, it provides superb separation and crystal-clear audio, minimising unwanted artefacts and line noise.
The unit is fully automatic, intelligently adapting to changing line conditions while maintaining optimal performance. Integrated automatic signal limiting and fully adaptive echo cancellation (up to 127ms, with a 24ms default) ensure natural, intelligible conversations without the need for constant adjustment.
Front panel controls provide intuitive access to input and output gain, while LED metering offers clear visual monitoring of both send and receive signals. Built-in conferencing enables two callers to be combined onto a single telco channel, making it ideal for live broadcasts, interviews, and discussion formats.
Call management is streamlined with an integrated ring detector, automatic answering after a user-defined number of rings, and automatic disconnection. Advanced line detection features—including K-break, line polarity reversal, and dial tone disconnect—ensure reliable operation across different regions, supported by configurable country settings and international line impedance matching.
The hybrid also includes an automatic ducking function, allowing presenters to override callers smoothly, as well as local and remote line hold switching for flexible studio control. A dedicated line hold/release button with status indication provides clear, immediate feedback.
For enhanced automation, DTMF tone recognition enables external control via opto-isolated GPI output, allowing actions such as triggering recording systems. Remote operation is further supported via RS232 for control, dialling, and firmware updates, along with a remote port for external switching and tally integration.
Audio connectivity is fully balanced throughout, with selectable mic/line input, low-impedance output, and a configurable record output for capturing both sides of a conversation. Additional processing, including a line limiter, bandpass filter, and output noise gate, ensures clean, low-distortion audio at all times.
Housed with a universal internal power supply (90–250V AC, 47–63Hz) and compliant with ETSI and European PTT standards, this unit is ready for reliable deployment worldwide.
Product Features
76dB typical line balance rejection offering superb performance and crystal clear audio.
Fully automatic - adapts to varying line conditions and has automatic signal limiting.
Fully adaptive echo cancellation to 127msec - default is 24msec.
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.
Typical Applications
Product Category
Discontinued TBUTECHNICAL SPECIFICATIONS
SUPPORT
Brochures
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Declarations
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| DHY-03 | Version | 1.68 | Date | 28/08/2015 | [Download] | |
| SCi 2 Software Control Interface (install as an administrator) | Version | 2.0.12 | Date | 18/12/2015 | [Download] |
| Full release notes for all firmware versions | [Download] |