The DH 400 system is the crowning of 45 years of experience in the manufacture Solidyne telephone hybrids It is a digital hybrid with DSP that allows to be configured in seconds from anywhere on the radio, through the LAN. You can select telephone lines for recording calls, air interviews or Televoting.The DH400 handles four telephone lines. The audio signal is digitized and processed within four DSP units (Digital Signal Processor) .The hybrid rejection is automatic and reaches values of 50 to 60 dB using a technology called digital echo cancellation.This high rejection allows to hear in loudspeakers the remote correspondent at the radio studio, large auditoriums or television sets. The hight return cancellation of DH400 applies both to telephone and acoustic path. It can handle the sound of videoconferencing; something impossible with analog hybrids.The DH400 is handled by an internal microcomputer that supports multiple modes. For example you can handle 4 Production phones so that the telephonists write on the PC screen the name of the caller then, the local talent can switch On-Air the caller, knowing beforehand all the basic information about the caller.It is possible to receive the line calls or place them to a conference from anywhere in the network where the DH400 software is installed. Production transfers the communication to the operator by pressing the button Flash of the telephone. Quite simply, all automatic. The operator if desired, may refrain from intervening.DH400 is able to work full automatic, 24 hours a day, attending phone lines, with personalized welcome message, and automatically recording 4 lines simultaneously.The recording is of high sound quality, unlike the PC telephone answering machines.During the night, a single DJ operator can handle the radio. DH400 attends four lines with the welcome message and then places it on HOLD status, with transference to the radio DJ. Pushing the NEXT button, the oldest caller on Hold will go On-Air. In all cases DH400 can be operated from its front panel or through PC software.Excellent audio quality; The absence of local voice return due echo cancellation algorithms, allows for excellent audio quality. VQR (Voice Quality Restoration) allowing air audio quality virtually indistinguishable from an Studio interview.
- 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
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 produces 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 Cancellation 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 400-2200 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 to 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)
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