Comrex DH30 Bedienungsanleitung

DH30 Digital telepHone HybriD

Section

table of Contents

1 .........introduction......................................................................................... 4

........................What iS ahybrid?...................................................................... 4

........................dh30 FeatureS ........................................................................ 4

........................What comeS With the dh30? .................................................... 6

........................Product regiStration and technical SuPPort .............................. 6

........................oPerational requirementS .......................................................... 7

2..........connecting the equiPment ..................................................................... 8

........................tyPical dh30 digital inStallation.............................................. 8

........................conSole connectionS — digital audio ...................................... 8

........................tyPical dh30 analog inStallation.............................................. 9

........................conSole connectionS — analog audio ...................................... 9

........................additional connectionS ............................................................. 10

3..........SetuP and oPeration .............................................................................. 12

........................Front Panel controlS ............................................................... 12

........................handling callS ......................................................................... 14

........................recording callS ........................................................................ 15

........................uSing the navigating buttonS and adjuSting ParameterS ............... 16

........................vieWing oF changing SettingS through the lcd Panel ................ 17

........................uSing PreSetS ............................................................................ 18

........................Setting levelS ........................................................................... 18

4..........auto mix-minuS and acouStic echo cancellation ..................................... 19

........................mix-minuS/acouStic echo cancellation ...................................... 19

........................echo reduction ........................................................................ 20

........................ec train .................................................................................. 20

........................diagnoSticS............................................................................... 21

........................teSt Signal ............................................................................... 21

5..........cuStomizing your SyStem ....................................................................... 22

........................Setting caller ProceSSing ......................................................... 22

........................SyStem ParameterS ..................................................................... 25

6..........SPeciFicationS ....................................................................................... 28

........................dimenSionS ............................................................................... 28

........................Weight .................................................................................... 28

........................oPerating temPerature .............................................................. 28

........................Front Panel controlS ............................................................... 28

........................rear Panel connectorS .............................................................. 28

........................telePhone tranSmit ................................................................... 29

........................telePhone receive ..................................................................... 30

........................echo cancellation/mix-minuS .................................................... 30

........................telco cancellation.................................................................... 30

Section

Comrex Corporation

Section

table of Contents (Cont.)

7 .........PinoutS ................................................................................................ 31

........................remote connector ................................................................... 31

........................rS232 connector ..................................................................... 31

........................record control........................................................................ 32

........................line connector ......................................................................... 32

........................Set connector .......................................................................... 32

........................xlr connector......................................................................... 32

8..........Serial communicationS Protocol............................................................. 33

9..........dh30 audio FloW ................................................................................ 35

10........comPliance ........................................................................................... 36

........................Fcc Part 15 comPliance .......................................................... 36

........................Fcc Part 68 comPliance .......................................................... 36

........................ic comPliance .......................................................................... 37

........................international comPliance .......................................................... 38

11........uSer-deFined PreSetS WorkSheet ............................................................ 39

12........gloSSary............................................................................................... 41

Section

DH30 Product Manual

About Comrex

Comrex has been building reliable, high quality broadcast equipment since 1961. Our products

are used daily in every part of the world by networks, stations and program producers.

Every product we manufacture has been carefully designed to function flawlessly, under the

harshest conditions, over many years of use. Each unit we ship has been individually and

thoroughly tested. Most items are available off-the-shelf, either directly from Comrex or from

our stocking dealers.

Comrex stands behind its products. We promise that if you call us for technical assistance,

you will talk directly with someone who knows about the equipment and will do everything

possible to help you.

Our toll free number in North America is 800-237-1776. Product information along with

engineering notes and user reports are available on our website at http://www.comrex.com.

Our E-Mail address is [email protected].

Warranty and Disclaimer

All equipment manufactured by Comrex Corporation is warranted by Comrex against defects

in material and workmanship for one year from the date of original purchase, as verified by

the return of the Warranty Registration Card. During the warranty period, we will repair or, at

our option, replace at no charge a product that proves to be defective, provided you obtain

return authorization from Comrex and return the product, shipping prepaid, to Comrex

Corporation, 19 Pine Road, Devens, MA 01434 USA. For return authorization, contact Comrex

at 978-784-1776 or fax 978-784-1717.

This Warranty does not apply if the product has been damaged by accident or misuse or as

the result of service or modification performed by anyone other than Comrex Corporation.

With the exception of the warranties set forth above, Comrex Corporation makes no other

warranties, expressed or implied or statutory, including but not limited to warranties of mer-

chantability and fitness for a particular purpose, which are hereby expressly disclaimed. In

no event shall Comrex Corporation have any liability for indirect, consequential or punitive

damages resulting from the use of this product.

The Comrex proprietary code and licensed, third party proprietary code residing in and oth-

erwise associated with this product are protected by copyright law and international treaties.

Unauthorized reproduction or distribution of this product, or any portion of it, may result in

civil and criminal sanctions, and will be prosecuted to the fullest extent of the law.

US Government Restricted Rights - Use, duplication, or disclosure by the US Government is

subject to restrictions set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and

Computer Software clause at DFARS (48 CFR) 252.227-7013 or subparagraphs (c)(1) and (2)

of the Commercial Computer Software-Restricted Rights clause at FAR (48 CFR) 52.227-19,

as applicable.

Comrex Corporation

seCtion 1 introDuCtion

Simply put, a hybrid is a device that separates send and receive audio on a

phone line. While the public switched telephone network utilizes separate

channels for audio in each direction of a phone call, these two signals are

mixed together before being sent to the end user. This way, only one pair

of wires is required from your telephone to the telco central office. To use

telephone company terms, the telephone network is a “4 wire” system,

while the local loop is a “2 wire” system.

When recording or airing telephone conversations in a studio environ-

ment, it’s important that telephone audio be “4 wire.” This is because the

audio program usually already contains the audio of the “studio host.” If

the telephone audio also contains some of the “studio host,” these two

signals will be added together by the mixing console. The effect will be dis-

tortion in the voice of the “studio host.” In essence, a hybrid converts the

“2 wire” telephone line back into a “4 wire” audio path.

It seems counter-intuitive, but the main goal of a studio hybrid is to make

the people in the studio sound better. If the hybrid isn’t working well,

people speaking from the studio will sound “hollow” or like they’re “talk-

ing into a barrel.” This is due to the strange effect of mixing microphone

audio with telephone “bleed-through.” Of course, our hybrids also im-

prove the audio of callers, filtering out hum and noise as well as adjusting

levels between loud and soft speakers.

It’s our opinion that with the advent of cheap telephones, cordless phones

and cellphones, telephone audio has gotten decidedly worse in recent

years. While a hybrid can cleanup noise to some extent, it can’t remove dis-

tortion caused by the far end telephone. If you find some calls sound good

on air and some don’t, it’s probably due to the large disparity in audio

quality of today’s telephone sets.

The DH30 provides a high quality telephone interface between a tele-

phone line and audio equipment to help bring uniformity and high quality

sound to a broadcast talk show environment. This telephone interconnec-

tion system uses digital hybrid technology to continually adapt to tele-

phone-line conditions, providing consistent high-quality sound. Here is a

list of the DH30 Digital Telephone Hybrid’s features:

• Selectable auto mix-minus and acoustic echo cancellation, allowing for

operation in a variety of closed or open studio environments.

What iS ahybrid?

dh30 FeatureS

DH30 Product Manual

• Programmable auto-answer, auto-disconnect and caller control functions.

• Call monitoring capability with a built-in 2-watt monitoring amplifier and

front-panel volume control.

• AES/EBU connections allow for a direct digital audio link between the

DH30 and a digital console.

• Analog connections are made using the send and cue inputs and the

caller and aux outputs.

• Each input and output has its own adjustable gain control, ensuring the

best audio mix in every application.

• The DH30’s 24-bit digital signal processing (DSP) produces high-quality

audio with expansion, compression, equalization and bass boost capabili-

ties. The downward expander, compressor and 3-band EQ allow you to

fine tune the sound of the caller audio.

• The telephone echo cancellation provides a high quality telephone inter-

face between a standard analog telephone line and user audio equipment.

The primary function of the hybrid is to separate send and caller audio

(null). The hybrid provides >55 dB send/caller isolation between 250 Hz

to 3.5 kHz.

• The DH30 is easily customized. The Enter, Esc, Volume control buttons,

and the LCD display provide useful control options, including integrated

monitor amplifier with push-button volume control, adjustable caller audio

control, adjustable three-band equalization, password protection and ad-

justable compressor/limiter and expander.

• The DH30 presets are the programmable operating parameters that

control how the DH30 responds to the telephone line. The DH30 can store

up to three presets. The unit ships with Preset 1 containing a set of default

values. You can keep these settings or modify them, and you can also set

up two additional presets. The Presets feature allows you to easily change

to a completely different operating profile. If power is lost, the DH30 pow-

ers up with the last preset used, so custom presets are not lost.

Comrex Corporation

Please register your DH30 by filling out and returning the enclosed warranty

registration card or by visiting our website www.comrex.com/warranty.html.

When your DH30 is properly registered, Comrex can better serve you should

you require technical assistance, need upgrades or new product information.

If you have any problems or simply need a question answered, please call us at

978-784-1776. Our toll free number in North America is 800-237-1776. Product

information along with engineering notes and user reports are available on our

website at http://www.comrex.com. Our email address is [email protected].

What comeS With the

dh30?

Product regiStration and

technical SuPPort

7-foot Modular

Telephone Cable DH30 Installation and

Operations Manual

DH30

(Domestic or International)

Esc

Enter

Off

Cue

Rec

-36

-24

-12

-3

-4

-36

-24

-12

-3

-4

Volume Send Caller

DH30

Digital Telephone Hybrid

Product Manual

Specialists

in Remote

Broadcast

Audio

Transmission

AC Power Cord

DH30 Product Manual

The DH30 is designed to work in almost any acoustic environment. However,

to improve audio quality and ease installation, we recommend that you take

the following factors into consideration:

Acoustic Room Treatment — Rooms that have large areas of windows,

white boards, hard floors, etc. are acoustically live. These areas increase the

amount of audio reverberation in the room which, in turn, reduces audio

quality. To achieve the best results using the DH30, you should minimize the

amount of audio reverberation wherever possible. You can improve room

acoustics by installing acoustic panels, drapes and other wall fabrics. Another

way to improve overall room acoustics is to keep room noise (i.e. computers

and fans) to a minimum.

Environmental — The room temperature at which the DH30 can operate

ranges from 32–100 degrees F / 0–38 degrees C, with relative humidity of

0–80 percent.

Telephone Line — The DH30 operates on standard telephone lines and

connects to a standard RJ11C modular jack. If you do not have an RJ11C jack

where you want to install the DH30, call your telephone company for instal-

lation.

Equipment Placement — The DH30 is designed for installation in a stan-

dard 19-inch equipment rack.

Power — The DH30 automatically adjusts to voltages between 100–240 Vac,

50–60 Hz. Manual voltage switching is not required.

oPerational requirementS

Comrex Corporation

seCtion 2 ConneCting tHe equipment

All equipment connections are made through the back panel. Position the

DH30 so that the connectors are readily accessible and their pin orientation

is visible. To use the functions associated with these connections, refer to

“Setup and Operation,” beginning on page 12.

conSole connectionS

— digital audio

AES/EBU In — This is the audio that the caller will hear. Connect an AES/EBU

output from the studio console to the AES/EBU Ininput of the DH30.

This connection provides a digital audio input directly to the Digital Signal

Processor (DSP). The AES/EBU digital audio input is stereo. The left channel is

designated as the send audio input and the right channel is the cue audio in-

put. In order to enable this input, the AES/EBU sampling rate must be selected

in the System Parameters menu.

AES/EBU Out — This is the output of the callers voice. Connect the AES/EBU

OUt to an AES/EBU input channel of the studio console.

This connection provides a digital audio output directly from the DSP. The out-

put sample rate follows the AES/EBU input sample rate. If no AES/EBU sample

rate is provided, the rate defaults to 32 kHz.

The AES/EBU digital audio output is stereo. The left channel is designated

as the caller audio out and the right channel contains the send or cue audio

(whichever is selected via the CUE button).

Note: You should cycle power anytime you disconnect AES/EBU connectors

from the DH30.

tyPical dh30 digital

inStallation

VOLTAGE RANGE 100V - 240V 2A

FREQUENCY 50Hz / 60Hz

AES/EBU IN AES/EBU OUT

RS-232 RECORD CONTROL

MONITOR

SEND IN CUE IN CALLER OUT AUX OUT

TELCO

LINE SET

Record

Control

REMOTE

Record Input

Console Out

Console In

Telephone Line

Telephone Set

DH30 Product Manual

Send In — This is the audio that the caller will hear. Connect a mic or line

output from the studio console to the SEnd Ininput of the DH30.

If the DH30’s echo canceller feature is disabled, you must send mix-minus

audio to the SEnd Inconnector. If you are using a microphone connected

directly to the DH30 that requires phantom power, you will need to acti-

vate the phantom power circuit. Contact Comrex technical support.

Cue In — This is the audio the caller will hear when the cue feature,

located on the front panel, is activated. Connect a mic or line output from

the studio console to the CUE Ininput of the DH30.

No auto mix-minus or acoustic echo cancellation is performed on the Cue

audio, and therefore, the audio sent to this input must be a mix-minus.

Caller Out — This is the output of the caller’s voice. Connect the CAllEr

OUt to an input channel of the studio console.

Aux Out — This is the output of the caller audio and the send or cue au-

dio (whichever is selected via the CUE button). Connect the AUx OUt to an

input channel of your studio console or recording device.

The caller/send mix is programmable through the front panel LCD display.

tyPical dh30 analog

inStallation

conSole connectionS

— analog audio

VOLTAGE RANGE 100V - 240V 2A

FREQUENCY 50Hz / 60Hz

AES/EBU IN AES/EBU OUT

REMOTE

RS-232 RECORD CONTROL

MONITOR

SEND IN CUE IN CALLER OUT AUX OUT

TELCO

LINE SET

Record Input

Record Control

Console In

Console Out

Telephone Line

Telephone Set

Comrex Corporation

additional connectionS Telephone Line Connections — The DH30 operates on one standard POTS

(plain old telephone service) analog telephone line or one analog extension

from a PBX via a standard RJ11C modular jack. Note: Some telephone lines

do not provide battery voltage (dry line, no DC offset voltage). If your line

does not, the DH30 may be configured by qualified personnel for dry line

operation. Please contact Comrex technical support for details.

Line — Plug your telephone line into the rJ11C lInE jack.

Set — Plug your telephone set into the rJ11C SEt jack.

Remote — Connect a DB25 parallel cable to this connector to provide con-

trol and status via your console remote port or contact-closure switches. This

connector also contains unbalanced audio inputs and outputs. See “Pinouts”

on pages 31-32.

Monitor — Connect a speaker or mono headphones to this 1/4” phone jack

to produce a 2-watt amplified audio signal for call monitoring. Only caller

audio is present on this output. Stereo headphones will contain caller audio

in one earpiece only.

The front panel volume buttons control the level of this output. See the

“Setup and Operation” section on pages 12-13 for front panel usage.

Record Control — Control a tape deck or other external recording device

with this dB9 rECOrd COntrOl connector.

This DB9 female connector sends start, stop and enable commands for au-

tomatic telephone call recording. This connector provides control only. Use

the AUx OUt connector to route audio to the recording device.

TELCO

LINE SET

REMOTE

MONITOR

RECORD CONTROL

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