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Description

Technical Information

   Technical Specs

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Tutorial about VQR theory


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DH400

 

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DH400 Digital Hybrid
Technical Specifications

 

  
 
Features & Technology

Digital Hybrid with DSP echo cancellation , auto-adjusted levels of transmission and returns by audio limiters and AGC.

Acoustic echo cancellation
.
Auto answering system

Speakerphone hands free for conference rooms
and radio auditorium

PC Remote control system. It works over a LAN network

Recording mode with auto-answering and
separate outputs for 4 lines

VQR system for restoration of original voice quality

 
 
Phone lines

4  phone lines in conference,
with cross gain between them.
Cell phones: One phone line can accept a cell phone

 
 
Control by AGC
Output console with a constant level independent of the telephone line, by audio limiter and Digital AGC.
 20 dB variation on the phone line produce less than 1.5 dB at the output to console
  
 

Input Level

Audio send to remote caller has audio limiter  and band pass filtering to operate with input signals
between –5 dBu and +8 dBu
 
  Echo Cancelation Typical 45 - 60 dB of echo cancelation,
using four DSP devices. 		 
  DSP parameters DSP echo cancelation parameters are factory loaded for quick use of DH400. But all parameters can be modified by the user, using LCD display  
  Sending level to phone line
-0 dBm +/- 1 dB, measured with 2 km artificial line
 
 
Send Filters
Band-Pass filters in send channel, limits response to
400 – 2.200 Hz for canceling on-air sound coloration.
  
 
Output Level

+4 dBu balanced.
Measured Over 600 ohms or high-Z
Studio Speaker: 0 dBm 
Cue Output/Speakerphone: -10 dBm

 
 
Frequency response
200 - 3750 Hz  +/- 3 dB without VQR
Using VQR it restores audio spectrum
between 50 - 12,000 Hz
 
 
GAIN
Auto-adjustable from 0 to 25 dB, depending on line level
 
 
Harmonic Distortion
Less than 0.1%  @ 1 kHz, at balanced output
 
 
NOISE

S / N over 60 dBA, measured with artificial line 2 km
More than 75 dBA using VQR

  
 
Hybrid rejection
Over 60 dB. Measured with artificial line 2 km
 
 
Line Isolation

balanced and floating  line inputs with the processor. Isolation 250 V AC

 
 
Overload Safety
2 KVolt protection against lightning discharge using SIOV technology
  
 
POWER
220 / 115 V, 50/60 Hz with a switch.
Consumption: less than 20 VA 
 
 
Dimensions
Rack mount 19”, One module high (44,4 mm)