Sonifex DHY-03 Telephone Hybrid

DHY-03 - Overview

• 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 and 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
  • 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
  • ETSI approval compliant with European PTT specifications
   

• Specifications:

  • Audio Specification
  • Input Impedance - Line Mode (Clean Feed): 10k Ohms balanced 0dB
  • Input Impedance - Conferencing: 10k Ohms balanced 0dB (not for DHY-03EC)
  • Input Impedance - Microphone Mode: 2k Ohms balanced (not for DHY-03EC)
  • Input Level Gain Range: +6dB, 0dB, and -6dB adjusted by 3-position front panel switch,
  • +10dB jumper
  • Microphone Level Gain Preset: From 65dB to 35dB (not for DHY-03EC)
  • Maximum Input Levels: Line +26dBu, mic -24dBu
  • Clean Feed Limiting Input: -4dBu for CTR21 setting, other values available *
  • Bandwidth to Telephone Line: 250Hz - 4kHz, -3dB ref 1kHz
  • Telephone Line Impedance: 600 Ohms , 900 Ohms plus 14 other complex impedance circuits *
  • Output Impedance - Line Out: 50 Ohms balanced floating 0dBu
  • Output Impedance - Conference/Record: 50 Ohms balanced floating 0dBu
  • Output Level Gain Range: +6db, 0dB, and -6dB adjusted by 3-position front panel switch
  • Rejection Ratio: 76dB on tones or complex waveforms, reference peak level of 0dB
  • Ring Detector Sensitivity: Off, 2, 4 or 6 rings
  • Power to DHY-03, S & T Universal 12 Ohms power supply: 90 to 250V AC; 47-63Hz; fused 1A
  • Power to DHY-03EC ±15 V DC @ 160mA per rail or regulated +5V DC @ 600mA
  • * These values are dependent on the actual country setting selected on the DHY-03