Sonifex - Telephone Balancing Units

HY-02 Digital

Sonifex Telephone Balancing Units
Telephone hybrids (or telephone balance units) 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 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.

The HY-03 is a high quality analogue 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 analogue HY-03 telephone hybrid is the replacement for the HY-02, which for many years has set the standard as an excellent value, high quality telephone hybrid.

The HY-03 analogue hybrids are available in three models :

  • HY-03 Single free-standing automatic analogue TBU with ringing detector.
  • HY-03S Single 19" rack mounted automatic analogue TBU with ringing detector.
  • HY-03T Twin 19" rack mounted automatic analogue TBU with ringing detector.

Related Links:
> HY-03 Analogue Telephone Hybrid in more detail...
> HY-03 Frequently Asked Questions
> HY-03 Brochure (PDF)

Sonifex DHY-02 Digital TBU
The DHY-02 uses digital signal processing to achieve superb results and is the best "value for money" hybrid that you'll find when comparing technical performance. It is also fully automatic with echo cancellation to 28msec and includes bar graph metering of send and receive signals. The DHY-02 series perform exactly the same function as the analogue units, but have some additional benefits.
  • Echo cancellation, over long-distance calls, is improved and distortion of other mixed signals is greatly reduced.
  • Digital hybrids are more tolerant to fluctuating line conditions and are especially suitable for dealing with calls that have a slight delay, for example, satellite calls. The DHY-02 can recall signals from its RAM buffer and allow for these delays without impairing performance.


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