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Comrex DH30 - Digital Hybrid

With the variety of phone systems in the world today, it is becoming increasingly difficult to have all callers sound the same on-air. To help bring uniformity and high quality sound to a broadcast talk show environment, we have created the DH30. The DH30 provides a high quality interface between a standard telephone line and your audio equipment. 

Designed with both AES/EBU and analog inputs and outputs, the DH30 can interface with the latest digital and analog consoles. To ensure quality sound in studios that have open speakers and microphones, the DH30 was created with an acoustic echo cancellation feature. 
 

The DH30's digital signal processing (DSP) has multiple adjustable parameters to provide you with the best send and caller audio signals. New audio processing features such as the compressor and downward expander functions ensure that the best audio reaches your audience. All audio processing features are programmable via the front panel controls. For the deepest, most reliable hybrid null, and the best quality caller audio for your application, the DH30 is the answer. 

Easy to use and install, the DH30 has simple front panel controls and remote control capability. These controls put the On, Off, Rec, and Cue functions right at your fingertips. The DH30 also includes a 2W monitor amp with volume controls right on the front panel. The Rec function sends a start/stop signal to your external recording device. The Cue function allows you to control which audio signal should be sent to the caller, allowing you to switch from the Send input to the Cue input at the touch of a button.


Specifications
Connections: AES/IBU In: XLR



AES/IBU Out: XLR



RS-232: DB9 Female Connector



Record Control: DB9 Female



Remote: DB25 Female

















Monitor Output: 1/4" stereo jack


Send Input: XLR female



Echo Cancellation/Mix-Minus


Telco Cancellation


Cue In: XLR Female



Caller Output: XLR male


Aux Output: XLR male


Telco Line: RJ11 connector




Telco Set: RJ11 connector

Telephone Transmit





Telephone Receive

 
Pin 1=ground,
Pin 2=+phase,
Pin 3=-phase; 32, 44.1, or 48kHz sample rate

Pin 1=ground,
Pin 2=+phase,
Pin 3=-phase; 32, 44.1, or 48kHz sample rate

9,600 baud rate, used for status and
control via a PC or other RS-232
controller

Start, stop, and enable outputs are open collector outputs rated at 40VDC and
50mA maximum

Remote Send Input:
0dBu nominal, adjustable,
unbalanced, 20k½ impedance
Remote Caller and Aux Output:
0dBu nominal, adjustable
unbalanced, 50½ impedance
Control Inputs:
Remotely activate any of the following functions with a simple switch
closure to ground: On, Off, Cue, and Rec along with preset selection controls
1,2, and 3 or with Send, Caller, and
Monitor Mute controls
Status Outputs: Remotely check the status of the hybrid using the On and Off status outputs. Status outputs are open collector outputs rated at 30VDC and 40mA maximum

Tip=+phase, Ring=ground,
Sleeve=ground, 1W output into an 8½ load

Mic/Line selectable, -55/0dBu nominal,
adjustable, balanced, bridging,
20k½ impedance

Tail time: 120 milliseconds
Null: 50dB

Tail time: 32 milliseconds
Null: 55dB

Mic/Line selectable, -55 or 0dBu
nominal, adjustable, balanced bridging, 20k½ impedance, selectable 12VDC phantom power


0dBu nominal, adjustable, balanced, 50½ impedance

0dBu nominal, adjustable, balanced, 50½ impedance

POTS (plain old telephone service) line or analog extension from a PBX or dry line (no DC offset voltage). A-Lead
supervision provided

A-Lead supervision provided

All measurements referenced at -15dBm level on the phone line
Frequency response: 250Hz to 3.5kHz, ±1dB
SNR: >70dB
Distortion: <0.15%

All measurements referenced at -15dBm level on the phone line with caller processing options bypassed
Frequency response: 250Hz to 3.5kHz, ±1dB
SNR: >70dB
Distortion: <0.1%
Functions: Controls LCD programming display, ENTER/ESC/st programming buttons, Monitor volume control,
Send-level LED bar meter,
Caller-level LED bar meter,
Record, cue,
Hybrid On/Off,
Buttons with status LEDs
Power: Power: IEC Type Auto Adjusting 100-240VAC, 2A, 50/60Hz, 30W

Physical:

Dimensions (LxDxH)



Weight

17.125" x 10.125" x 1.75"
43.5 x 25.7 x 4.44 cm
Rack mount included for installation in a 19" rack

6.7 lb/3.04 kg (dry)
11.2 lb /5.08 kg (shipping)

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