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DH30 Product Manual

41

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lossary

AES/EBU — 

Audio Engineering Society/European Broadcasting Union. The 

protocol for communicating two-channel digital audio information over a 
serial link.

AEC — 

Acoustic Echo Cancellation. The process of removing echo before 

it returns to its source.

AERL — 

Acoustic Echo Return Loss. The amount of echo returned to the 

audio source in an acoustic environment.

Analog Line — 

A telephone line that is not digital.

Balanced Audio — 

 A two-line audio signal without reference to ground 

(i.e. differential-mode audio).

Bass Boost —

 Spectral enhancement of frequencies below 250 Hz.

Bypass —

 A route where current flows around instead of through a com-

ponent or circuit.

Cadence — 

Any tone on a telephone line that has a distinct pattern. 

Call Progress Tones —

 Tones sent from the telephone switch to inform 

the caller or devices that a call has ended. These tones include a busy sig-
nal, dial tone, fast busy, or dual-tones.

Caller —

 The caller’s voice as it enters the hybrid from the telephone line.

Caller Control —

 Suppression of caller audio when send audio is present.

Compressor —

 See Limiter.

Console —

 The audio mixer used to combine all programming sources. A 

console is also called a mixing board, a mixer, audio board, etc.

Cue —

 Audio heard by caller when cue mode is active.

Digital Signal Processing —

 Digitally modifying a signal to provide a spe-

cific function or output.

Dryline —

 A telephone circuit over which voice signals are transmitted 

and contains no DC offset voltage.

Содержание DH30

Страница 1: ...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 Proc...

Страница 2: ...l 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 Section Section Section Section ...

Страница 3: ...n 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 s...

Страница 4: ...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 ...

Страница 5: ...andard 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 adjust...

Страница 6: ...8 784 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 info comrex com 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 ...

Страница 7: ... 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...

Страница 8: ...his 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 ...

Страница 9: ...0 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...

Страница 10: ...ole 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 b...

Страница 11: ... commands to re motely control operation request status or download firmware upgrades Refer to Serial Communications Protocol on pages 33 34 Power Connection This connection automatically adjusts to accept voltages between 100 240 Vac 50 60 Hz The AC power cord is an IEC type connector which allows use of domestic US power cords as well as international power cords RS232 VOLTAGE RANGE 100V 240V 2A...

Страница 12: ...ndi cates that the DH30 is on A flashing green LED indicates an incoming call When the Off button is pressed the DH30 disconnects from the telephone line and mutes caller audio The red Off LED illuminates Record The Rec button controls the start or stop of an external record ing device connected to the DH30 through the Record Control output on the rear panel The Record LED flashes red when recordi...

Страница 13: ...speaker or headphone connected to the Monitor jack on the rear panel Pressing a button once in creases or decreases the level by 3 dB Holding a button sweeps the volume up or down At power up the monitor volume defaults to a nominal reference of 0dB The volume may be adjusted between 18 dB and 27 dB Reducing the volume past 27 dB turns off the monitor and mutes the power ampli fier output indicate...

Страница 14: ...to disconnect the call The Off LED illumi nates and the On LED goes out Note If the handset is off hook when the Off button is pressed the caller will remain on the handset If your call is through the handset only the red Off LED is lit hang up when the conversation is complete Making a Call Call the party normally using your telephone handset After the other party has answered put the call on air...

Страница 15: ...LED is not lit Recording Manually When the hybrid is on press Record to begin recording The LED will flash When you turn the hybrid off or when you press Record again recording will stop and the LED will go off Using Record Ready Press Record when the hybrid is off The Record LED will illuminate When the On button is pressed recording begins automatically and the Record LED flashes When the hybrid...

Страница 16: ...ating that the Up and Down buttons will adjust the value As values are adjusted up and down the change takes effect immediately For example as you adjust the caller out gain you ll hear the level change While adjusting a parameter up and down an asterisk appears when the displayed value matches the preset value When you have adjusted the parameter to the desired value press Enter This stores the v...

Страница 17: ...ine or background noise when caller is not talking Bypass Bass Boost Enhances caller bass Bypass Caller Control Allows talent to talk over caller 0dB Noise Burst Toggles whether or not a noise burst is sent down telephone line when connection to the phone line is made On Echo Canceller Adjust Auto Mix Minus AEC Mix minus AEC Turns mix minus acoustic echo cancellation on off On Echo Reduction Selec...

Страница 18: ...and Caller Out level changes on the Send and Caller meter LED s 4 Press Enter to save the value into the current selected preset Using Presets Preset 1 Preset 2 Preset 3 Setting Levels Submenu Options Function Hints for Setting Send In Gain The Send In level is set for a nominal input level of 0dB This line level input is adjustable from 20dB to 20dB Adjust to select a value that registers 0dB on ...

Страница 19: ...nal chain For the same reason the mix minus genera tion will cause severe distortion on overdriven audio levels In practice whenever practical we recommend creation of a true mix minus feed in the studio rather than engaging this function We consider this feature useful as a last resort when no true mix minus is technically possible Acoustic Echo is the echo in a room environment In an application...

Страница 20: ...The display shows both the Echo Return Loss ERL and the current Echo Cancellation EC 1 Place a call and route it through the DH30 or have someone call in If echo is present continue with steps 2 7 2 Select EC Train from the Echo Canceller menu and press Enter This sends a constant burst of white noise out of the Caller Out output The EC Train uses this white noise to monitor how much noise comes b...

Страница 21: ...uttons to select the desired readout 4 Press Enter to generate a test signal 5 Press Enter to cycle through Receive Transmit and Receive and Transmit test signals Note When generating tones during the diagnostic you must scroll through all three readouts before the test signal ceases Pressing Esc will take you out of the diagnostic but will not stop the test signal When configuring your DH30 you c...

Страница 22: ...ill have the following characteristics LowBand 250 Hz 715 Hz MidBand 715 Hz 1 645 Hz HiBand 1 645 Hz 3 500 Hz Adjustment in each band is from 12 to 12 dB Setting Caller Processing Compressor The function of the compressor is to keep the caller output at the same level regardless of the incoming level The caller level should be set to accommodate the quiet callers The DH30 compresses or attenuates ...

Страница 23: ...threshold Adjustable from 100 ms to 2000 ms 2 seconds Expander Downward expander The expander reduces telephone line noise when the caller is not talking by decreasing audio gain when caller audio falls below the threshold level As long as the caller audio remains above the threshold the expander function remains at unity gain no expansion When the caller audio sample drops below the expander thre...

Страница 24: ...ould be 6 to 12 dB Noise Burst If activated a momentary noise burst will be sent to the telephone line when turning the hybrid on The noise burst allows the DSP to adapt the telephone echo canceller and provides a better null at the be ginning of the call Without the noise burst the DSP may add attenuation on the caller audio until the DSP has adapted to an acceptable null The trade off in setting...

Страница 25: ...lly turns the digital hybrid off The green On LED goes out and the red Off LED comes on The DH30 discon nects on all reorder tones with a cadence Auto disconnect may not func tion as described with some PBX systems Problems in auto answer mode may be caused by ring timing Also some PBX systems do not provide loop drop or loop reversal when disconnecting calls If your PBX only provides reorder tone...

Страница 26: ...otely turn the DH30 on and off respectively Note The Record and Cue functions can only be activated by momentary closures See Section 7 on pages 31 32 for pinout information Latching If you prefer to use a single switch to remotely control the DH30 then select Latching in the Remote Control menu DH30 Remote Port 1 On 2 Off 5 Gnd Momentary Switch DH30 Remote Port 1 On 5 Gnd Latching Switch ...

Страница 27: ...g rate is chosen incorrectly or if an AES EBU signal is not applied after choosing a sampling rate the product will malfunction If the AES EBU Input remains Off the AES EBU Output will remain active synchronized to an internal 32KHz sampling clock If an AES EBU input is applied and the correct sampling rate option is cho sen the AES EBU output will synchronize to the input sampling rate clock Set ...

Страница 28: ...n 1 ground pin 2 phase pin 3 phase 32 44 1 or 48kHz sample rate RS232 DB9 female connector 9 600 baud rate used for status and control via a PC or other RS232 controller RECORD CONTROL DB9 female Start stop and enable outputs are open collector outputs rated at 40VDC and 50mA maximum REMOTE DB25 female Remote Send Input 0dBu nominal adjustable unbalanced 20k Ohm impedance Remote Caller and Aux Out...

Страница 29: ...al adjustable balanced bridging 20k Ohm impedance selectable 12VDC Phantom Power CALLER OUTPUT XLR male 0dBu nominal adjustable balanced 50k Ohm impedance AUX OUTPUT XLR male 0dBu nominal adjustable balanced 50k Ohm impedance TELCO LINE RJ11 connector POTS plain old telephone service line or analog extension from a PBX or dry line no DC offset voltage A Lead supervision provided see Line Connector...

Страница 30: ...the phone line with caller processing options bypassed FREQUENCY RESPONSE 1dB from 250Hz to 3 5kHz DYNAMIC RANGE 70dB DISTORTION 0 1 TAIL TIME 120 milliseconds NULL 50dB TAIL TIME 32 milliseconds NULL 55dB Telephone Receive Echo Cancellation Mix Minus Telco Cancellation ...

Страница 31: ...nced Aux Out 12 11 Record Indication 16 Cue Indication 17 Indicator Common 18 22 Unbalanced Audio Common 23 24 19 Send Presence Indicator Indicator Common Caller Presence Indicator 21 20 Switch Common 25 Pin Description Remote off Indication Unbalanced Audio Common Unbalanced Audio Common Remote control provided via contact closure to digital ground Remote indicators provided via open collector ou...

Страница 32: ... RJ11C When the On button is illuminated on the DH30 an A Lead Closure is provided between pins 2 and 5 of the Line and Set jacks This connection is useful for key telephone system such as the 1A2 If you connect the DH30 to an extension jack of a more modern PBX you should first check to see if those wires are used for signalling or power If so do not connect them to the DH30 You may however use t...

Страница 33: ...all Function On Off Off On Cue Status Cue Off Cue On Cue Toggle Record Status Record Off Record On Record Toggle Monitor Volume Up Monitor Volume Down no value give Current Preset Select Preset 1 Select Preset 2 Select Preset 3 Incoming Call Status Returned 0 1 2 3 Serial Command TE cr TE 0 cr TE 1 cr CUE cr CUE 0 cr CUE 1 cr Cue 2 cr REC cr REC 0 cr REC 1 cr REC 2 cr VOLUP cr VOLDWN cr PRESET cr ...

Страница 34: ...e new value followed by a DH30 command prompt For example a command to turn Cue on would be formatted like this CUE 1 cr CUE function command 1 On as shown in the facing table The returned response would be CUE 1 DH30 If the Cue feature was off and the toggle Cue command was sent CUE 2 cr The returned response would be CUE 1 DH30 Indicating that the Cue feature had been turned on To get status bac...

Страница 35: ...LR Send In DB25 Pin 9 Cue In XLR Telco Line RJ 11 Telco Set RJ 11 Monitor 1 4 Phono 2 W Amp Caller Out XLR Caller Out DB25 Pin 10 Aux Out XLR Aux Out DB25 Pin 11 Mic Line Mic Line AES EBU Out XLR Caller Processing Gain 20 Gain 20 Gain 20 Gain 20 Send In Cue In Aux Send Send to Aux Aux Call Call Out Monitor Volume Off Full Bandwidth Processed Send Processing AES EBU AES EBU In XLR AES EBU Send left...

Страница 36: ...ur telephone company USOC Jacks This device uses RJ11C and RJ21X terminal jacks The REN is used to determine the quantity of devices which may be con nected to the telephone line Excessive REN s on the telephone line may re sult in the devices not ringing in response to an incoming call In most but not all areas the sum of the REN s should not exceed five 5 To be certain of the number of devices t...

Страница 37: ...uld ensure that it is permissible to be connected to the facilities of the local telecommunications com pany The equipment must also be installed using an acceptable method of connection In some cases the company s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly telephone extension cord The customer should be aware that comp...

Страница 38: ... of success ful operation on every PSTN network termination point In the event of problems you should contact your equipment supplier in the first instance Network Compatibility Declaration Comrex Corporation 19 Pine Road Devens MA 01434 USA declares that the product Digital Hybrid 30 DH30 910 012 302 is designed to be com patible with the following networks Austria Belgium Denmark Finland France ...

Страница 39: ...end In Preamp Line Line Mic Cue In Gain 20 to 20dB 0dB Cue In Preamp Line Line Mic Call Out Gain 20 to 20dB 0dB Aux Send Gain 20 to 20dB 0dB Aux Call Gain 20 to 20dB 0dB Caller EQ EQ Bypass Off On On EQ Low Band 20 to 20dB 0dB EQ Mid Band 20 to 20dB 0dB EQ High Band 20 to 20dB 0dB Compressor Comp Ratio Bypass Bypass 2 1 3 1 4 1 6 1 Limiter Comp Threshold 20 to 20dB 0dB Comp Post Gain 20 to 20dB 0d...

Страница 40: ...Off Receive Transmit Rcv Transmit System Auto Answer Off Off On Auto Disconnect Off Off Loop Drop Only Call Prog Only Loop Drop CP Remote Control Momentary Momentary Latching Remote Aux Pins Mute Audio Select Presets Select Presets Send to Aux Off Processed Processed Full bandwidth AES EBU AES Off AES Off 32000 kHz 44100 kHz 48000 kHz Version Vx x Date Lock Panel Off Off On L will appear in lower ...

Страница 41: ...nd instead of through a com ponent or circuit Cadence Any tone on a telephone line that has a distinct pattern Call Progress Tones Tones sent from the telephone switch to inform the caller or devices that a call has ended These tones include a busy sig nal dial tone fast busy or dual tones Caller The caller s voice as it enters the hybrid from the telephone line Caller Control Suppression of calle...

Страница 42: ...t whose output signal amplitude remains at a predeter mined level despite variations in input signal amplitude Loop Drop A temporary interruption on the telephone line s DC voltage Mix Minus Audio that must be sent to callers to prevent feedback on the audio system through the hybrid Mix Minus is a mix of all audio on the console minus the caller s audio Without a mix minus feed the caller audio a...

Страница 43: ...nverts a telephone line 2 wire low level signal into a balanced 4 wire line level signal with indepen dent send and receive ports A telephone hybrid provides the necessary electronic matching between the telephone line and the audio equipment Generally referred to in this manual as simply hybrid Telephone Line The line delivered by the telephone company to an individual subscriber Sometimes known ...

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