Vortex EF2280 Reference Manual
VORTEX EF2280 REFERENCE MANUAL Introduction....................................................................................................2 Product Features .................................................................................................... 3 Pre-Installation...............................................................................................4 EF2280 Front and Rear Panels.............................................................................. 5 Installation ..........
INTRODUCTION INTRODUCTION Welcome Congratulations on your purchase of the Vortex EF2280! How to Use This Manual This is a reference manual for your EF2280. It is structured to provide the information you need quickly and conveniently. The following is an overview of each section: • • • • • • • • • • • • About the EF2280 Introduction Conference System Design gives suggestions on topics to consider when designing your system.
INTRODUCTION improves the sound quality of an automixer, for example, by preventing it from bringing the noise level up and down when microphones are gated on and off. By cancelling the noise picked up by each microphone, the overall signal to noise ratio (SNR) is preserved. The result is crystal clear speech over a greater decibel range than any other echo canceller. That means reduced listener fatigue and a higher quality audio conference.
PRE-INSTALLATION PRE-INSTALLATION What’s Included The Vortex EF2280 product package includes the following items: • • • • • • • • • • Vortex EF2280 Reference Manual Vortex EF2280 External power supply Cat 5 cable for EF Bus or ASPI Bus EF Bus terminator Rack mount screws (4) Phoenix connectors (24) Cable clamp and screw CDROM containing other manuals and Conference Composer software Warranty Registration Card Rackmount Screws (4) Vortex® EF2280 x x x Phoenix Connectors (24) x EF Bus Terminator C
PRE-INSTALLATION EF2280 FRONT AND REAR PANELS 1 9 2 10 11 12 13 14 3 4 15 5 6 7 16 17 8 18 19 Figure 2. EF2280 Front and Rear Panels 1. 2. 3. 4. 5. 6. 7. 8. © Polycom, Inc. LCD DISPLAY. Displays menu instructions for configuration and operation of the EF2280. DOWN BUTTON. Scrolls backward through menu items at a particular level or decreases the value of a parameter. UP BUTTON. Scrolls forward through menu items at a particular level or increases the value of a parameter. ENTER.
PRE-INSTALLATION 9 10 11 12 13 14 15 Figure 3. Parallel remote control, EF BUS, serial remote control, ASPI BUS OUT, and power supply input on back panel of the EF2280. 9. 10. 11. 12. 13. INPUT PARALLEL PORT. Parallel logic input. OUTPUT PARALLEL PORT. Parallel logic output. EF BUS IN. Connects to EF BUS OUT of another EF2280. EF BUS OUT. Connects to the EF BUS IN of another EF2280. RS-232 SERIAL PORT.
INSTALLATION INSTALLATION MOUNTING THE EF2280 The EF2280 can be mounted in a rack enclosure using four large screws (10-32x1/2”) included with the unit. One EF2280 fits in a single rack space. Recommendation For Easy Access While not required, leave a single rack space in between the EF2280 and other units in your rack. This gives you easier access to the back panel.
INSTALLATION In 1 Out 1 In 2 Out 2 In 3 Out 3 In 4 Out 4 In 5 Out 5 In 6 Out 6 In 7 Out 7 Video CODEC Out 8 In 8 Vortex® EF2280 In A Line In Line Out Out A In B Out B In C Out C In D Out D From AEC To AEC From Rem. To Rem. EF200 Phone PSTN Figure 5. Block diagram of typical EF2280 connections: a single room using one EF2280. PSTN ASPI Bus Connection for RS-232 Control EF200 Phone Add (Optional) 8 microphones ...
INSTALLATION The following steps are typically used to setup the EF2280: • • • • • Connect a microphone to each of the 8 mic/line level inputs. The mic/line input accepts mini-Phoenix connectors. See “Connector Pinouts” on page 48 for pinouts of Phoenix connectors. Connect one line output to an amplifier or powered loudspeaker. Connect the reference input (Input A, B, C, or D) to TO AEC on the EF200 (if you have multiple EF200’s, connect only one reference) or to the output of the codec.
INSTALLATION 5. 6. 7. Terminating the EF2280 Connect another Cat-5 cable between the EF BUS OUT of the second device and the EF BUS IN of the third device, and so on. Terminate the chain of EF2280s using the instructions below. Power on all units at the same time The EF2280 must be terminated with the provided EF Bus terminator. Place a terminator in the EF BUS IN of the first device in the chain and also in the EF BUS OUT of the last device.
INSTALLATION Add, for RS-232 control, use the ASPI bus. The ASPI Bus does not need to be terminated. See Figure 8 below. From AEC From Rem. Out 1 In 2 Out 2 In 3 Out 3 In 4 Out 4 In 5 Out 5 In 6 Out 6 To AEC To Rem. EF200 Phone ASPI Bus In In 1 In 7 Out 7 In 8 Out 8 Vortex® ASPI Bus Out In A From AEC To AEC From Rem. To Rem.
INSTALLATION whichever preset you want to come up after power up). The unit will need to be configured for your system.
INSTALLATION Presets and Multiple EF2280s PRESET 0 is preconfigured for a system with multiple EF2280s. Microphones are bussed out to other units on the W Bus. Microphones are also input into each EF2280 on the W Bus (INPUT WM0 in the Matrix). If you have multiple EF2280s in your system, save settings to a preset on each EF2280. Saving a preset will only save the preset on that particular unit. Also, remember to set the POWER ON PRESET to the correct Preset.
INSTALLATION 3. OR adjust the placement of the microphone relative to the loudspeaker. Room Gain Meter Read Room Gain from here Figure 9. Room Gain Meter on the Diagnostics page of the Conference Composer control software. Configure Program Audio Sources Set the gains on the matrix mixer inputs from the program audio sources so that program audio is played into the room at a level similar to that of speech from the remote site.
INTEGRATING THE EF2280 INTO YOUR SYSTEM INTEGRATING THE EF2280 INTO YOUR SYSTEM Operating the EF2280 The EF2280 can be operated in two ways: through the LCD menu on the front panel or through RS-232. For control via RS-232, please refer to the EF2280 Programming Guide, which includes programming tips as well as the EF2280 RS-232 commands. For operation using the PC control software, Conference Composer, please refer to the Conference Composer User Guide.
INTEGRATING THE EF2280 INTO YOUR SYSTEM you should increase your input gain by 15 dB. If the meter shows an average gain of +10 dB, you should decrease your input gain by 10 dB. AGC Level Meter Read AGC le Adjust Input Gain here Figure 10. AGC Meter on the Diagnostics page of the Conference Composer software. IF THE AGC METER SHOWS... ADJUST THE INPUT GAIN IN THIS WAY. positive gain Increase gain by the level shown in the box. negative gain Decrease gain by the level shown in the box.
INTEGRATING THE EF2280 INTO YOUR SYSTEM Customize Setting for Your Particular Application The following sections will describe customizing parameters on the EF2280 for your particular application if you are not using Preset 0.
INTEGRATING THE EF2280 INTO YOUR SYSTEM If Room 1's loudspeaker contains a mix of Room 2's microphones, then Room 1's AEC reference should also contain Room 2's microphones. The same is true for Room 2's AEC reference. In 1 Out 1 Polycom Video CODEC In 2 Out 2 Line In In 3 Out 3 In 4 Out 4 In 5 Out 5 In 6 Out 6 In 7 Out 7 In 8 Out 8 Vortex® EF2280 In A Line Out From AEC To AEC From Rem. To Rem. EF200 Phone Polycom Video CODEC Line In Line Out From AEC To AEC From Rem. To Rem.
INTEGRATING THE EF2280 INTO YOUR SYSTEM this EF2280 in Conference Composer is shown in Figure 12 and the EF Bus page in Figure 13. Conference Composer will not allow more than one EF2280 assign their echo canceller reference as the Bus Reference. Notice that the EF200 and VS4000 inputs are both assigned to Reference 1 on the originating EF2280. The Matrix for any linked EF2280s is shown in Figure 14. Figure 12. Matrix page of origin EF2280 (ID 00) Figure 13.
INTEGRATING THE EF2280 INTO YOUR SYSTEM If far end audio and program audio sources are on several EF2280s, 1. 2. Bus each far end audio and program audio source to each EF2280. Do this by assigning each signal input to either the W, X, Y or Z bus. Assign an echo canceller reference on each EF2280 that will include all far end audio and program audio sources. CONFIGURE THE AUTOMATIC MICROPHONE MIXER The EF2280 contains two independent automatic microphone mixers.
INTEGRATING THE EF2280 INTO YOUR SYSTEM Global Settings. Decay Time. Decay time is the amount of time the microphone audio takes to ramp down to the Off Attenuation level after Hold Time. Decay Time values range from 0 to 5000 msec. The default value is 1000 msec. Hold Time. This is the amount of time the microphone stays On after the energy in the channel drops below the gating threshold. The default value is 500 msec. The range is 1 to 5000 msec.
INTEGRATING THE EF2280 INTO YOUR SYSTEM gate a channel on if it is more than 10 dB louder than the background noise level. Values range from 0 to 100 dB. To set the gate ratio, scroll through the gate ratio range and select the desired gate ratio by pressing ENTER. Manual Threshold. Sets the automixer gating threshold for the specified input channel. This value is only used if the input set to Manual Gating via the THRESHOLD TYPE option. Microphone Priority.
INTEGRATING THE EF2280 INTO YOUR SYSTEM Operating as an Independent Automixer To set the EF2280 to operate as an independent automixer (or two), set the BUS MIXER parameter to 0, or to a number that is different from any other automixer group on the EF Bus. Operating as One Automixer with Multiple EF2280s To set the EF2280 to operate as one automixer across several EF2280s, set the BUS MIXER parameter on all EF2280s to the same automixer group.
INTEGRATING THE EF2280 INTO YOUR SYSTEM The EF Bus The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z audio busses as well as the echo canceller reference and remote control information (for other EF2280s) and can link up to 8 EF2280 devices. All busses include NOM information and can be used for sharing microphone inputs, or for sharing mono or stereo program information. Crosspoint Mix Minus Bus.
INTEGRATING THE EF2280 INTO YOUR SYSTEM 4. Configure Your Echo Canceller Reference Review what inputs need to be included in your echo canceller reference — See “Build Your Echo Canceller Reference” on page 17. Remember that each microphone needs to have an echo canceller reference. If all microphones are in the same room and use the same reference, configure the echo canceller reference on one EF2280 and assign it to the EF Bus as the EF Bus Reference.
LCD MENU STRUCTURE LCD MENU STRUCTURE LCD Menu Tree The EF2280 LCD menu structure is made up of seven menu trees: SYSTEM, INPUTS, OUTPUTS, AUTOMIXER, MATRIX, PARAMETRIC EQ, and PRESETS. Each menu tree is organized by levels and branches into multiple subcategories. The branches end with an adjustable parameter or value.
LCD MENU STRUCTURE DOWN button. To scroll forward through menu items at a particular level, use the UP button. To adjust a parameter, first locate the parameter by scrolling to the appropriate menu (with combinations of the UP/DOWN and ENTER buttons). The display will show the parameter field and the parameter value. To change the parameter, the parameter must be flashing. To make the parameter flash (assuming the front panel is not locked) press ENTER.
LCD MENU STRUCTURE System Overview Table 3 below shows a summary of EF2280 parameters and their ranges..
LCD MENU STRUCTURE SYSTEM MENU System Power On Preset Acknowledgement Mode Bus Reference Error Messages Front Panel Lock The SYSTEM menu contains POWER ON PRESET, ACKNOWLEDGEMENT MODE, BUS REFERENCE, ERROR MESSAGES, FRONT PANEL LOCK, FRONT PANEL PASSWORD, DEVICE ID, LCD CONTRAST, METER, NON-VOLATILE MEMORY LOCK, NON-VOLATILE MEMORY PASSWORD, SCREEN SAVER, SOFTWARE VERSION, and REBOOT EF2280 configurations. Power On Preset. Choose the EF2280 Preset for power up. Acknowledgement Mode.
LCD MENU STRUCTURE INPUTS Inputs 1-8, A-D Acoustic Echo Cancellation (In 1-8) Automatic Gain Control (AGC), In 1-8 AGC Maximum (In 1-8) AGC Minimum (In 1-8) Gain Level Min/Line (In 1-8) Mute Noise Cancellation (In 1-8) Noise Cancellation Level (In 1-8) The input menu allows the user to adjust functions related to the input signals to the EF2280.
LCD MENU STRUCTURE cancellation. The default is 10 dB. Noise Cancellation Level (Inputs 1-8). Selects the amount of noise cancellation. This ranges from 0 to 15 dB. Phantom Power. Use this parameter to turn phantom power On or Off for inputs 1-8. Echo Canceller Reference. This parameter decides which reference is associated with which zone. Choose between REF1, REF2, or the external bus reference. AEC Suppression. Sets the amount of double talk suppression used in the AEC.
LCD MENU STRUCTURE AUTOMIXER MENU Automixer Global Settings These parameters configure how the EF2280 automatic microphone mixer operates. Parameters include the following: DECAY TIME, HOLD TIME, CAMERA GATING THRESHOLD, BUS ID, CHAIRMAN MODE, CHAIRMAN MIC, LAST MIC ON MODE, LAST MIC NUMBER, LOCAL MAX NOM, GLOBAL MAX NOM, OFF ATTENUATION, AUTOMIXER, THRESHOLD TYPE, GATING MODE, GATE RATIO, MANUAL THRESHOLD, and MIC PRIORITY.
LCD MENU STRUCTURE Mixer Settings. Automixer Mixer Settings (AM1/AM2) Bus ID Chairman Mode Chairman Mic Last Mic On Mode Last Mic Number Local Max NOM Global Max NOM Off Attenuation Bus ID. This command is used to assign one of the two internal automixers to one of the EF Bus automixer groups. For example, consider three EF2280s each of which has four microphones assigned to Automixer 1 and 4 microphones assigned to Automixer 2.
LCD MENU STRUCTURE MATRIX MENU Matrix Main Matrix The MATRIX contains commands for assigning input signals to output signals with appropriate gains applied or mutes applied. It also allows for Gating to be turned on for Inputs 1-8. This menu can apply gains to both the MAIN MATRIX and the SUBMATRIX. Crosspoint Gains. Assign input signals to output signals with appropriate gains applied. Gate. Applies gating from Inputs 1-8 to an Output. Gain Gate (In 1-8) Mute. Applies mute to the crosspoint.
LCD MENU STRUCTURE PARAMETRIC EQ MENU Parametric EQ (In 1-8) Input/Output EQ Channel Band Filter Type Frequency Bandwidth Gain Slope Filter Enable Figure 26. EF2280 Parametric EQ submenu The input equalizer is comprised of up to 5 bands of filtering. The whole group of filters for the channel can also be enabled/disabled without losing the settings for each band. For each band, you first select the type of filter from the following: Parametric/ Peaking, High Shelf, Low Shelf, Lowpass, or Highpass.
TROUBLESHOOTING TROUBLESHOOTING AUTOMATIC MICROPHONE MIXER No microphones are gating • • Check if the microphones are muted. Are microphones part of one of the 2 automixers? Some microphones are not gating • • • Check if the microphones are assigned to an automixer. Check if the microphones are muted. Check microphone levels. Are microphones set to the appropriate mic or line level? Is phantom power on where needed? The Hold Time may be too low.
TROUBLESHOOTING MATRIX MIXER Don’t hear output • • Make sure the output is not muted. Check that the input you’re expecting to hear is included in the output that you’re listening to. ECHO CANCELLER REFERENCE Room Audio Sounds Choppy If you hear the local room’s audio from the loudspeakers and it sounds choppy, you may have included the room’s microphones in the echo canceller reference.
TROUBLESHOOTING AEC Reverberation Acoustic Echo Figure 27. Reverberation vs. Acoustic Echo. Reverberation is not an artifact of the echo canceller. It is mainly affected by the distance of the microphone from the speech source and by the resonances of the room. While reverberation can be unpleasant, it is not compensated for by the acoustic echo canceller (AEC), which only removes reflections of remote speech.
TROUBLESHOOTING and the level of this signal that is reflected as the microphone input (after microphone amplification). A AEC B Room Gain = 20 log (B/A) Figure 28. Room Gain. If the electrical level of the reflected signal picked up by microphone is the same as the level of the electrical signal sent from the AEC to the loudspeaker output, the room gain of this microphone channel is said to be 0 dB.
TROUBLESHOOTING talker to the microphone. The microphone audio will most likely also be muddy and reverberant. The installer or user may try to solve these microphone audio quality problems by turning up the microphone amplification, thus adding to the room gain. This problem can be remedied by proper microphone selection (pickup pattern, directionality) and placement, coupled with proper microphone input calibration. 3.
TROUBLESHOOTING Nonlinear distortion causes a degradation or divergence of the AEC’s internal model of the room acoustics. In this situation, the EF2280 cannot effectively cancel room echoes and a substantial amount of echo may be heard by the remote party. Excessive microphone amplification also increases room gain (See “Excessive Room Gain” on page 39.). You can check for excessive microphone amplification by observing the front panel LEVEL INDICATOR during a normal conference.
TROUBLESHOOTING If you suspect the loudspeaker is introducing nonlinearities into the room acoustic path, take these steps to minimize its influence on the echo canceller. • • • Keep the loudspeaker’s volume level at less than three-eighths of full scale. If higher volume is required, the EF2280 should operate effectively at volume settings of up to 50 percent of full scale. At more than 50 percent, most audio systems and loudspeakers introduce significant nonlinearities.
TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS MECHANICAL SPECIFICATIONS Dimensions 19” (483 mm) W x 9.6” (244 mm) L x 1.75” (45 mm) H (full rack unit) Weight 4 lb. (1.8 kg) dry 5.5 lb. (2.5 kg) shipping Connectors Audio: Mini (3.
TECHNICAL SPECIFICATIONS USA and Canada This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. 2. NOTE This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
TECHNICAL SPECIFICATIONS Installation Instructions* Installation must be performed in accordance with all relevant national wiring rules. Plug acts as Disconnect Device* The socket outlet to which this apparatus is connected must be installed near the equipment and must always be readily accessible © Polycom, Inc. L’Installation doit être exécutée conformément à tous les règlements nationaux applicable au filage électrique.
CONFERENCE SYSTEM DESIGN CONFERENCE SYSTEM DESIGN Good audio or video conferencing is more than acoustic echo cancellation. Before installing the EF2280, you should consider how your whole conference system will work together.
© Polycom, Inc.
CONNECTOR PINOUTS CONNECTOR PINOUTS EF Bus EF BUS IN 8 1 1 8 The EF Bus uses RJ45 connectors. These should be used with category five twisted-pair cable. The total distance of the EF Bus should be less than 4 m. The EF Bus must be connected so that the EF Bus In of one box is connected to the EF Bus Out of another. Connecting the EF Bus In to another EF Bus In (or Out to Out) will not work.
CONNECTOR PINOUTS Input/Output Remote Control Port INPUT 13 Logic Input: Pins 1-24 are inputs 1-24, respectively. Pin 25 is ground. 1 25 14 Logic Output: Pins 1-20 are outputs 1-20, respectively. Pins 21-25 are ground. Each ground pin should be used with only 4 outputs. For example, outputs 1-4 could be connected to LEDs, which are connected to ground pin 1. REMOTE CONTROL OUTPUT LEDs can be used without series resistors (we have provided series resistors in the circuitry).
CONNECTOR PINOUTS CONNECTING UNBALANCED RCA TO BALANCED MINI PHOENIX RCA Male Mini (3.5 mm) Phoenix Tip Red Black Red + 1 Black - 2 Shield 3 Ring Figure 31. Cable construction for connecting unbalanced RCA to balanced mini Phoenix (3 conductor terminal block). 1. 2. 3. Connect RCA Tip to Phoenix pin 1. Connect RCA Ring to Phoenix pin 2. Connect Phoenix pin 3 to Shield, and leave Shield floating on RCA end. Caution! Do NOT connect the shield at both ends.
CONNECTOR PINOUTS ADDITIONAL NOTES Caution! Caution! Caution! Caution! Caution! © Polycom, Inc. Failure to use all four screws to attach the EF2280 to the rack may result in uneven loading and cause a safety hazard. Ensure that the power supply is securely located such that it cannot become dislodged and fall. Such a fall could cause personal injury or equipment failure. When mounting a EF2280 in a rack, consideration should be given to airflow and operating ambient temperatures inside the rack.
WARRANTY INFORMATION WARRANTY INFORMATION What is covered Any defect in materials or workmanship. For how long Two years. What we will do If your Polycom EF2280 product is defective and returned within two years of the date of purchase, we will repair or, at our option, replace it at no charge to you. If we repair your Polycom EF2280 product, we may use new or reconditioned replacement parts.
WARRANTY INFORMATION What this warranty does not cover This warranty does not cover defects resulting from accidents, damage while in transit to our service location, alterations, unauthorized repair, failure to follow instructions, misuse, fire, flood, lightning, acts of God, or use in those countries where such use violates Part 779 of the Export Administration Regulations of the United States Department of Commerce.
DEFINITION OF TERMS DEFINITION OF TERMS Acoustic Echo Acoustic echo occurs in a conferencing or distance learning system when the remote speech played in the loudspeakers is picked up by microphones in the room and is transmitted back to the remote end. This transmitted signal is a delayed version of the original, which causes the echo. Acoustic Gain Acoustic gain is a term used in conjunction with sound reinforcement.
DEFINITION OF TERMS Echo Canceller An echo canceller estimates the echo in an audio signal by using a reference and preforms processing to eliminate the echo from the signal. EF Bus The EF Bus is a digital bus that includes the W, X, Y, and Z audio busses as well as the echo canceller reference and remote control information. It can be used to link multiple EF2280 devices. Equalization Equalization is the process of adjusting frequency characteristics of an audio signal.
DEFINITION OF TERMS Room Gain The room gain of a conferencing system refers to the relative levels of the signal sent to the line output to your amplifier (before any amplification) and the level of this signal that is reflected at the microphone input (after microphone amplification).
INDEX INDEX A C D E F G I L M N O P R ASPI Bus 3, 6, 9, 11, 43, 48, 54 Automatic Gain Control (AGC) 3, 30, 54 Automixer, Automatic Microphone Mixer 2, 3, 20, 32, 54 Calibration 15 Compliance 43 Digital Bus 2, 3, 24, 55 Echo Cancellation 2, 3, 31, 43, 46 EF Bus 6, 9, 10, 23, 24, 31, 43, 48, 55 EF Bus Reference 24, 29 EF200 Phone Add 4, 9, 10, 55 Equalization 55 Equalizer 3 Factory Default 11 Ground 48, 49 Grounding 7 Inputs 2, 3, 5, 6, 7, 9, 15 LCD Menu 3, 5, 15, 18, 26 Link, Linked 3, 23, 29, 55 Matri
INDEX S Reverberation 46 Room Gain 13, 38, 56 RS-232, Serial Remote Control 3, 4, 6, 9, 15, 24, 27, 30, 43, 48 Signal Generator 2, 3 VORTEX EF2280 Reference Manual 58 Technical Support: 800.932.
Polycom, Inc. Installed Voice Business Group 1720 Peachtree Street NW, Suite 220 Atlanta, GA 30309-2439 Phone: (800) 932-2774, (404) 892-3200 Fax: (404) 892-2512 www.polycom.com Technical Support: (800) 932-2774 vortex@polycom.com Polycom®, Vortex®, and the Polycom logo are registered trademarks of Polycom, Inc. in the United States and various countries. Copyright © 2002 Polycom, Inc. All rights reserved.
