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Polycom Vortex EF2280, Reference Manual

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C

ONFERENCE

 S

YSTEM

 D

ESIGN

V

ORTEX

 EF2280

 

Reference Manual

50

Technical Support: 800.765.9266

To help you measure room gain, the EF2280 includes a room gain detector. 
You should check your room gain after you have set up the EF2280.

Figure 29. 

Room Gain.

AEC

A

B

Room Gain = 20 log (B/A)

Summary of Contents for Vortex EF2280

Page 1: ...Vortex EF2280 Reference Manual...

Page 2: ......

Page 3: ...29 Input Settings 29 Calibration 29 Build Your Echo Canceller Reference 31 Echo Canceller Reference for Multiple Vortex Devices 31 Configure the Automatic Microphone Mixer 33 Automixer Settings for M...

Page 4: ...VORTEX EF2280 REFERENCE MANUAL Polycom Inc Copyright 2004 2 Technical Support 800 795 9266...

Page 5: ...y Information Definition of Terms explains terms used in this manual as well as terms used in our technology of echo cancellation noise cancellation and audio conferencing About the EF2280 The EF2280...

Page 6: ...tion will help us to provide you with better customer support and will allow us to notify you with updated product features and software PRODUCT FEATURES Product Front panel LCD for controlling and co...

Page 7: ...trol RS 232 port for remote control Reconfigurable parallel logic input output EF bus for linking multiple Vortex devices Digital bus with 4 audio busses 48 kHz sampling rate Up to 8 Vortex EF2280 dev...

Page 8: ...INTRODUCTION VORTEX EF2280 Reference Manual 6 Technical Support 800 765 9266...

Page 9: ...duct package but may be necessary to create a completely functional system Microphones Loudspeakers Audio amplifier or amplified loudspeaker Vortex Phone Hybrid EF2201 EF2211 EF2241 Audio cables Video...

Page 10: ...values 5 ESC Returns to the next highest level of menus 6 HOME Returns to the top of the menu structure 7 LEVEL INDICATOR Indicates the level of the selected channel or parameter 8 CHANNEL ACTIVITY LE...

Page 11: ...th the EF2280 15 MIC LINE INPUTS Connects to microphone at either mic or line level with or without phantom power 16 LINE INPUTS Inputs A D at line level 17 LINE OUTPUTS Outputs 1 8 at line level A D...

Page 12: ...PRE INSTALLATION VORTEX EF2280 Reference Manual 10 Technical Support 800 765 9266...

Page 13: ...asily Instructions for Securing Power Supply to Back of EF2280 Locate the cable clamp on the back panel of the EF2280 above the RS 232 port Remove the screw and thread the power cord through the cable...

Page 14: ...80 In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8 In A In B Out A Out B In D Out C Out D In C EF2201 Video CODEC Line In Line Out PSTN EF Bus 6 RS 232 PIN 2 TX...

Page 15: ...as the P bus Up to 8 devices can transmit on the W X Y and Z busses Similarly up to 8 devices can transmit on the P bus Note that the EF2241 counts as one of both types CONNECTING MULTIPLE Vortex Dev...

Page 16: ...WER ON PRE Figure 7 Legacy Vortex EF2280 products SKU 2200 82280 xyz require an EF Bus terminator when linked at either end of a Vortex chain EF2280 s that have their audio input and output connectors...

Page 17: ...e 500 ms Last Mic On Mode On on Automixer 1 Max NOM per Automixer 8 Off Attenuation 15 dB INPUT CHANNELS Acoustic Echo Cancellation On Automatic Gain Control AGC On Automixer 1 Echo Canceller Referenc...

Page 18: ...put gain should be adjusted so that you get a 0 dBu level i e adding 8 dB of gain Check Levels to the Codec Configure the matrix mixer output to the codec input The output gain of the matrix mixer sho...

Page 19: ...ust the placement of the microphone relative to the loudspeaker Configure Program Audio Sources Set the gains on the matrix mixer inputs from the program audio sources so that program audio is played...

Page 20: ...INSTALLATION VORTEX EF2280 Reference Manual 18 Technical Support 800 765 9266...

Page 21: ...1 Summary of button functions on the EF2280 Vortex EF2280 System Settings Parametric EQ Automixer Outputs Inputs 1 8 A D System Bus Reference Error Messages Acknowledgement Mode Front Panel Password...

Page 22: ...value The parameter is instantly updated while it is being adjusted you should hear changes as the parameter is changing RS 232 control strings are also sent via the RS 232 port so your remote control...

Page 23: ...Selects the Device ID of the unit Baud Rate Selects baud rate of the RS 232 Flow Control Selects flow control between Hardware None or Auto LCD Contrast Controls the contrast level of the front panel...

Page 24: ...ly for Inputs 1 8and T Gain This parameter adjusts the gain level of the 12 inputs This is nor mally configured during the calibration process The default setting is 15 dB for microphone signals and 0...

Page 25: ...n applied to each output signal using this parameter The default setting is 0 dB Though the EF2280 allows for pos itive output gain you should always try to adjust input gains to a good level so that...

Page 26: ...ld 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 Microphone channel...

Page 27: ...Bus ID Off Attenuation Sets the Off Attenuation in dB for the specified auto mixer Setting this value to 18 would result in the microphone signals being attenuated by 18 dB when gated off This value...

Page 28: ...e all microphones set to priority 1 If Chairman Mode is enabled all microphones including ones with priority of 1 will be gated off when the Chairman mic gates on MATRIX MENU The MATRIX contains comma...

Page 29: ...Hz and 20 000 Hz in 1 Hz steps Bandwidth in dB octave between 1 and 24 dB octave but is always less than or equal to 1 2 x Gain Gain in dB between 20 and 20 in 1 dB steps Lowpass Cutoff Frequency in...

Page 30: ...6 47 Factory presets Pre set 0 15 cannot be overwritten Delete Deletes the selected user preset Presets 16 47 Factory Presets Presets 0 15 cannot be deleted MACROS Run Macro 0 255 Allows you to run ma...

Page 31: ...er Control Software See the Conference Composer User Guide Phantom power should be turned On for condenser and electret microphones CALIBRATION When using the factory default Preset 0 the following ca...

Page 32: ...pment The line inputs have a maximum nominal level of 0 dBu If your incoming line level inputs have a higher nominal level than 0 dBu you will want to use an analog pad to remove the level Figure 20 A...

Page 33: ...ated by 3 dB as well as any other audio that is going to your loud speaker If you are using crosspoint gains in the loudspeaker mix apply the same gains to the signals in your reference If your system...

Page 34: ...and 1 Polycom VS4000 video codec The originating sources for far end audio is EF2280 with ID 0 The Matrix for this EF2280 in Conference Composer is shown in Figure 12 and the EF Bus page in Figure 13...

Page 35: ...n does not activate microphones in two different zones which they would tend to do if each zone had its own automatic mixer Use both automatic mixers when the EF2280 is split to operate independently...

Page 36: ...the result of Hold Time values that are too high Camera Gating Threshold Specifies the hold time for camera gating information Camera gating information can be used to position a camera by using the g...

Page 37: ...th Threshold Type Sets adaptive or manual automatic gating thresholds per input The default is adaptive Gating Mode Sets the automixer gating control mode for specified input channel The possible mode...

Page 38: ...her on the AUTOMIXER page in Conference Com poser or on the MATRIX MIXER page The BUS MIXER parameter is used to assign one of the two internal automixers to one of the EF Bus automixer groups For exa...

Page 39: ...signer software will do these tasks for you automatically 1 Assign Inputs Assign each audio source to an input Remember to include the conferencing equipment such as a Vortex Phone Hybrid or a video c...

Page 40: ...Y and Z busses of the other devices for a total of 12 mixes The mixes can have crosspoint gains on the signals from the other devices See Figure 26 below All 12 mixes become inputs to the main matrix...

Page 41: ...se the EF Bus Reference For systems with more than one room you will need to use the W X Y or Z sub busses to share the echo canceller reference in your additional rooms if the EF Bus Reference has al...

Page 42: ...INTEGRATING THE EF2280 INTO YOUR SYSTEM VORTEX EF2280 Reference Manual 40 Technical Support 800 765 9266...

Page 43: ...the Adaptive Threshold if the Gate Threshold is set to Adaptive or adjust the Manual Threshold if the Gate Threshold is set to Manual For Adaptive Gate Threshold set the Adaptive Threshold lower so t...

Page 44: ...m s microphones to the local output with the matrix but do not add them to the echo canceller reference For more specific guidelines on what to include in your echo canceller reference see Build Your...

Page 45: ...he echo that the remote end is hearing goes away when a particular channel is muted If you find that the echo goes away when a particular channel is muted the microphone may not be calibrated correctl...

Page 46: ...nal is too low the room audio amplifier is usually used to com pensate and bring the room audio to an acceptable level For example if the reference signal is 12 dB too low the room audio will need to...

Page 47: ...not too high Run the built in EF2280 Room Gain test to verify that you do not have room gain problems See Verify Room Gain on page 16 In Conference Quick Check If you experience residual echo problems...

Page 48: ...analogous to rais ing the background noise level in the room Because this noise is uncorrelated with the echoes within the room the EF2280 s ability to adapt and cancel echoes will be less than optim...

Page 49: ...ties The EF2280 may not adapt under these conditions and echoes may be heard If the loudspeaker has a bass control lower it Excessive bass can cause a boomy effect that is nonlinear In addition excess...

Page 50: ...TROUBLESHOOTING VORTEX EF2280 Reference Manual 48 Technical Support 800 765 9266...

Page 51: ...great way to reduce noise in your sys tem and improve the SNR Polycom s patent pending noise cancellation algo rithm included in the EF2280 removes up to 15 dB of ambient background noise and improve...

Page 52: ...0 Reference Manual 50 Technical Support 800 765 9266 To help you measure room gain the EF2280 includes a room gain detector You should check your room gain after you have set up the EF2280 Figure 29 R...

Page 53: ...dBu 1 THD N Nominal level 0 dBu 0 775V rms Equivalent input noise 124 dBu 20 20 000 Hz Input Impedance 10 kOhms Input EMI Filter Pi filter on all audio inputs Outputs Output Gain 100 to 20 dBu in 1 d...

Page 54: ...quency energy and if not installed and used in accordance with the instruction manual may cause harmful interfer ence to radio communications Operation of this equipment in a residential area is likel...

Page 55: ...this product may cause radio interference in which case the user may be required to take adequate measures Installation Instructions Installation must be performed in accordance with all relevant nat...

Page 56: ...Peak one cycle surge current 50Hz 25A Holding current 150mA min 750mA max Capacitance 30 5pF Off state current 5 A 2 EARTHING Earthing is of the utmost importance if the protector is to work effective...

Page 57: ...TECHNICAL SPECIFICATIONS Polycom Inc 55 VORTEX EF2280 Reference Manual P O Box Sinoville South Africa Tel 27 82 4520269 Fax 27 1 27210751...

Page 58: ...TECHNICAL SPECIFICATIONS VORTEX EF2280 Reference Manual 56 Technical Support 800 765 9266...

Page 59: ...PEQ Line Output 5 Delay PEQ Line Output 4 Delay PEQ Line Output 3 Delay PEQ Line Output 2 Delay PEQ Line Mic Line 1 Mic Line Phantom A D Level adjust EN Input D Line A D Level adjust Input C Line A D...

Page 60: ...ther EF Bus In or Out to Out will not work Cat 5 Plug Pinout 1 White Orange 2 Orange 3 White Green 4 Blue 5 White Blue 6 Green 7 White Brown 8 Brown RS 232 Port 9600 19200 38400 8 N 1 The RS 232 port...

Page 61: ...n 1 LEDs can be used without series resistors we have provided series resistors in the circuitry For best results LEDs with Vf 2 0 V and If 20 mA should be used Larger values may be used but may resul...

Page 62: ...RJ45 connector Connect pin 3 to pin 6 with an 110 Ohm resistor A terminator is not required for the EF2280 s with stacked audio connections as the terminator is built in Figure 31 Cable construction f...

Page 63: ...ck should not exceed 40 degrees Celsius Allow 2 inches 51mm of open space in front of the EF2280 2 inches 51mm on either side and 4 inches 102 mm behind the unit for proper ventilation Equipment shoul...

Page 64: ...CONNECTOR PINOUTS VORTEX EF2280 Reference Manual 62 Technical Support 800 765 9266...

Page 65: ...ng or reproducing any program or data stored in or used with Vortex products Some states do not allow limitations on how long an implied warranty lasts or the exclusion of incidental or consequential...

Page 66: ...of the same or similar design The repair or replacement is war ranted for 90 days The limited warranties and remedies set forth above are exclusive and in lieu of all other warranties whether oral or...

Page 67: ...the microphone Convergence Rate Convergence rate refers to the amount of echo a line or acoustic echo cancel ler can cancel per unit time typically expressed in dB sec Better echo cancel lers have a...

Page 68: ...tion Noise cancellation is a digital signal process that removes noise from an audio signal corrupted by real world interferences such as HVAC office noise crowd noise or road noise Generally there ar...

Page 69: ...rical level of the reflected signal picked up by the microphone is the same as the level of the electrical signal sent from the AEC to the line output to your amplifier the room gain of this microphon...

Page 70: ...DEFINITION OF TERMS VORTEX EF2280 Reference Manual 68 Technical Support 800 765 9266...

Page 71: ...5 41 Automixer Gating Mode 25 35 Automixer Global Max NOM 25 35 Automixer Hold Time 15 24 34 41 Automixer Last Mic On 15 25 34 Automixer Local Max NOM 25 35 Automixer Manual Threshold 15 25 35 41 Auto...

Page 72: ...37 Mic Line Inputs Line Inputs Line Outputs 59 Mix Minus 38 65 Multiple Vortex Devices 5 14 16 31 36 37 38 39 66 N Noise Cancellation 3 4 22 23 49 52 66 NOM 23 37 66 NOM Attenuation 66 NOM Bus 39 66...

Page 73: ...DEX Polycom Inc 71 VORTEX EF2241 Reference Manual S Signal Generator 4 Submatrix 26 37 38 T Technical Support 47 Terminal Block Connectors 59 Terminating the EF Bus Terminators 14 60 V Video Codec 32...

Page 74: ...INDEX VORTEX EF2241 Reference Manual 72 Technical Support 800 765 9266...

Page 75: ......

Page 76: ...0 Polycom 765 9266 www polycom com Technical Support 800 765 9266 Polycom Vortex and the Polycom logo are registered trademarks of Polycom Inc in the United States and various countries Copyright 2002...

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