Polycom Vortex EF2241 Reference Manual
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Polycom Vortex EF2241 Reference Manual

Polycom ef2241 audio: user guide
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  • Page 1 Vortex EF2241 Reference Manual...

  • Page 3: Table Of Contents

    EF2241 Front and Rear Panels... 6 Installation ...8 Mounting the EF2241 ... 8 Connecting the EF2241 to Other Equipment ... 8 Device IDs on the EF Bus... 10 Connecting Multiple Vortex Devices ... 10 Factory Default Settings (Preset 0) ... 11 Check Surrounding Equipment...

  • Page 4: Manual

    (for instance, 8 EF2280s, or 2 EF2241s and 6 EF2280s). The EF2241 has 4 mic/line inputs, 4 line inputs and 8 line outputs with 4 channels of acoustic echo and noise cancellation. It has matrix mixing and automatic microphone mixing capabilities, a single telephone line interface, and a single channel power amp.

  • Page 5: Product Features

    W, X, Y, and Z outputs to the digital expansion bus, P output to the digital expansion bus, output to the power amplifier, and output to the phone line. The EF2241 has 24 bit resolution, 32-bit floating point computation, and a 48 kHz sampling rate.

  • Page 6: Remote Control

    Digital bus with 5 audio busses, 48 kHz sampling rate • Up to 8 Vortex devices can be linked, each device providing 4 audio signals on the bus and each EF2241 providing 1 phone audio signal on the bus EF2241 Reference Manual ORTEX Technical Support: 800.932.2774...

  • Page 7: Pre-Installation

    Connectors (16) External Power Supply Figure 1. What’s Included with your Vortex EF2241. What’s Not The following equipment is not included with the EF2241 product package, but may Included be necessary to create a completely functional system: • Microphones •...

  • Page 8: Ef2241 Front And Rear Panels

    EF2241 F RONT AND Figure 2. EF2241 Front and Rear Panels LCD D EF2241. decreases the value of a parameter. the value of a parameter. handset connected to the P disable the P inputs. EF2241 Reference Manual ORTEX ANELS . Displays menu instructions for configuration and operation of the ISPLAY .
  • Page 9 Figure 3. Parallel remote control, EF B input, and power amplifier output on back panel of the EF2241. 10. I 11. O 12. EF B 13. EF B 14. RS-232 S such as a touch panel or personal computer COM port.

  • Page 10: Installation

    ONNECTING THE Grounding The EF2241 has 4 mic/line inputs plus 4 line level inputs and 8 line level outputs. Each input/output is “Pin 1 compatible” — this means that the ground pin of each input/output is tied to chassis ground. Chassis ground is connected to the input power ground.
  • Page 11 Typical EF2241 The EF2241 will typically be connected to other equipment in a single room setup as Connections shown below in Figure 5 and Figure 6. Figure 5. Block diagram of typical EF2241 connections: a single room using one EF2241.

  • Page 12: Device Ids On The Ef Bus

    P Bus. The EF2280, for example can only transmit on the W, X, Y, and Z busses while the EF2241 can transmit on the W, X, Y, and Z busses as well as the P bus. Up to 8 devices can transmit on the W, X, Y, and Z busses.
  • Page 13 ACTORY EFAULT ETTINGS The following is a list of the factory default settings of the EF2241. Since the micro- phones and other equipment in your application may have different nominal levels, you can start with a F ronment and then save it within the EF2241 as a U you’ve saved a U...
  • Page 14 Acoustic Echo Cancellation Automatic Gain Control (AGC) AGC Rate AGC Max Gain AGC Min Gain Automixer Echo Canceller Reference Filtering Gate Priority Adaptive Threshold Gate Threshold Gating EF2241 Reference Manual ORTEX ARAMETERS ARAMETERS ARAMETERS HANNELS NSTALLATION ACTORY EFAULT RESET ALUE 1000 ms...

  • Page 15: Check Surrounding Equipment

    HECK URROUNDING Now that the physical connections to the EF2241 are set up, it may be necessary to check the surrounding equipment to make sure levels are set correctly. The following suggestions may be helpful in integrating the EF2241 into your system: Pick a Standard A standard nominal signal level should be used throughout the audio system.
  • Page 16 The meter shows the room gain, which is the relative level of the output level and the input level. While the EF2241 will operate in positive room gain conditions, the room gain should be around 0 dB or a negative value. If you have a positive room gain, make adjustments in the following areas: Decrease the Input Gain of the microphone.

  • Page 17: Calibration

    NTEGRATING THE Operating the The EF2241 can be operated in two ways: through the LCD menu on the front panel EF2241 or through RS-232. For control via RS-232, please refer to the EF2241 Programming Guide, which includes programming tips as well as the EF2241 RS-232 commands.
  • Page 18 If you are connecting from equipment that has RCA plugs, you will most likely need 8 dB of gain on the Input and -8 dB of gain on the Output. EF2241 Reference Manual ORTEX NTEGRATING THE...

  • Page 19: Build Your Echo Canceller Reference

    ET UP THE HONE NTERFACE The echo canceller reference of the EF2241 is by default set up with the phone input already assigned to it. By default the phone interface will be disabled until you select a country code for the telephony interface.
  • Page 20 Bus Reference Vortex device, For example, a system uses 1 EF2241, 1 EF2280, and 1 Polycom VS4000 video codec. The Reference 1 is set up on EF2280 with ID 0. The Matrix for this EF2280 in Conference Composer is shown in Figure 10 and the EF Bus page in Figure 11.
  • Page 21 (which they would tend to do if each zone had its own automatic mixer). Use both automatic mixers when the EF2241 is split to operate independently between two rooms. One automatic mixer is used in each room. The advantage of...
  • Page 22 Figure 13. Off Attenuation, Hold Time, Adaptive Threshold, and Decay Time. 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.

  • Page 23: Automixer Settings For Multiple Vortex Devices

    • Two large automixers, sharing automixer functions with other devices linked to it Figure 14. Vortex Automixer Settings in Conference Composer Software © Polycom, Inc. NTEGRATING THE option. HRESHOLD ULTIPLE ORTEX EF2241 I YSTEM NTER EVICES EF2241 Reference Manual ORTEX...

  • Page 24: Configure The Matrix Mixer

    The following is a checklist for building a system with mutliple devices: Assign Inputs. Assign Outputs. Configure submatrix (the EF Bus). Configure your echo canceller reference. EF2241 Reference Manual ORTEX NTEGRATING THE and the B UTOMIXER parameter chooses which automixer the input channel will be on (this is...
  • Page 25 1. Assign Inputs Assign each audio source to an input. Remember to include the conferencing equip- ment such as a video codec and any program audio. 2. Assign Outputs Try to assign as many outputs as you can to one Vortex device to make a simpler sub- matrix.

  • Page 26: The Ef Bus

    The “M” denotes Mix. The P Bus. phone audio from the EF2241. The EF2241 can both transmit and receive signals on the P bus, while the EF2280 can only receive signals from the P bus.

  • Page 27: Presets

    RESET accordingly. OWER RESET EF B of one of another Vortex to another EF B (or EF B RESETS to the User Preset you have saved to. The EF2241 Reference Manual ORTEX...
  • Page 28 Table 2: Summary of button functions on the EF2241. The EF2241 has five menu buttons on the front panel for navigation in the menu tree. Press the H menu. The E est level of menus. To scroll back through menu items at a particular level, use the button.

  • Page 29: Lcd Menu Structure

    While adjusting a parameter, the U button must be held down briefly before the repeat rate increases. © Polycom, Inc. EF2241 Reference Manual ORTEX...

  • Page 30: System Menu

    Choose the EF2241 Preset for power up. This command controls whether or not status mes- This designates which EF2241 device, when multiple devices Turns error messages On or Off. Locks or unlocks the front panel. When the front panel is...

  • Page 31: Phone Control

    DTMF Gain. Country Select Ring Tone Enable. Dial Tone Gain DTMF Gain Ring Tone Enable Figure 18. EF2241 Phone Control sub- menu © Polycom, Inc. Enables or disables auto answer. Enables or disables auto hangup based on call Enables or disables auto hangup cased on loop Selects the country where you are using the unit.

  • Page 32: Inputs

    NPUTS The input menu allows the user to adjust functions related to the input signals to the EF2241. This menu contains A ONTROL Inputs 1-4, T, A-D EFERENCE Inputs (1-4) and (A-D), so that you first select an input and then select settings for that Acoustic Echo input.

  • Page 33: Outputs

    Outputs you should always try to adjust input gains to a good level so that the output gain is 0 dB. If you find that you need a positive output gain from the EF2241, first check your Output Gain input gain to make sure you are getting a good level (around 0dB). Keep the output gain at around 0 dBu.
  • Page 34 Figure 22. Automixer parameters. 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.
  • Page 35 Automixer Reference. When enabled, the echo canceller reference becomes a muted input in the automix so that far end audio coming from the speakers does not gate on local microphones. Reference Bias. Adjusts how much gain is applied to the Automixer Reference signal.

  • Page 36: Matrix Menu

    Gain Mute. Gate (In 1-4) Mute SubMatrix Gain Mute Figure 23. EF2241 Matrix submenu EF2241 Reference Manual ORTEX contains commands for assigning input signals to output signals with ATRIX Assign input signals to output signals with appropriate gains Applies gating from Inputs 1-4 to an Output.

  • Page 37: Parametric Eq Menu

    Slope Lowpass. Filter Enable • Highpass. Figure 24. EF2241 Parametric EQ sub- • menu Center frequency on Parametric/Peaking is the point with the most (or least) gain. Bandwidth is the width halfway up the peak (so if the peak is 10 dB, it is the width between the points where the gain is 5 dB).

  • Page 38: Presets

    Save. cannot be overwritten. Presets Delete. 15) cannot be deleted. Restore Save Presets 16-47 Delete Presets 16-47 Figure 25. EF2241 Presets submenu ACROS Run Macro (0-255). Macros Run Macro (0-255) Figure 26. EF2241 Macros submenu EF2241 Reference Manual ORTEX Restores the selected preset.

  • Page 39: Troubleshooting

    For Manual Gate Threshold, set the Manual Threshold to a higher absolute threshold. • Using the Adaptive Gate Threshold is recommended for more accurate gating. © Polycom, Inc. IXER ROUBLESHOOTING EF2241 Reference Manual ORTEX...

  • Page 40: Matrix Mixer

    You may hear residual echo if system levels are not set properly. Improper level set- tings anywhere in the audio path can introduce nonlinearities that hamper the opera- tion of the EF2241. If you hear residual echo, one of the following conditions may be causing the problem.
  • Page 41 You cannot remove the effects of reverberation by changing the EF2241’s settings, but you can minimize reverberation by moving microphones closer to talkers and, if necessary, adding acoustical treatment to the room.
  • Page 42 This may be explained as follows. If the reference signal is too low coming into the EF2241, i.e. the codec audio signal is too low, the room audio amplifier is usually used to compensate and bring the room audio to an acceptable level.
  • Page 43 Run the built-in EF2241 Room Gain test to verify that you do not have room gain problems (See “Verify Room Gain” on page 14).
  • Page 44 Overdriving the loudspeaker or inserting a dynamics processor before the EF2241 may distort the signal that the microphones see causing ineffective AEC operation. The EF2241 relies on the linearity of the acoustic feedback path — D/A, amplifier, loudspeaker, microphone, and A/D — to cancel acoustic echoes. If you overdrive the...

  • Page 45: Contacting Technical Support

    • Increase the separation distance between microphones and the loudspeaker. The EF2241 handles up to 10 dB of room gain between the loudspeaker and the microphone. You may be exceeding this limit if the loudspeaker is pointed directly at the microphones or if the loudspeaker volume is excessive (loud- speaker placement is not critical, but it should not be pointed directly at the microphones).

  • Page 46: Technical Specifications

    Convergence Rate of LEC Noise Cancellation Control Inputs Status Outputs EF2241 Reference Manual ORTEX 19” (483 mm) W x 9.6” (244 mm) L x 1.75” (45 mm) H (full rack unit) 4 lb. (1.8 kg) dry 5.5 lb. (2.5 kg) shipping Audio: Mini (3.5mm) quick connect terminal blocks...

  • Page 47: Compliance

    OMPLIANCE The Vortex EF2241 complies with the ITU G.167 Recommendation for AEC, FCC part 15, and CE requirements. USA and Canada This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation.
  • Page 48 This precaution may be particularly important in rural areas. Caution: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate. EF2241 Reference Manual ORTEX ECHNICAL Technical Support: 800.932.2774...
  • Page 49 The socket outlet to which this apparatus is connected must be installed near the equipment and must always be readily accessible © Polycom, Inc. ECHNICAL Warning This equipment will be inoperable when mains power fails ORTEX PECIFICATIONS EF2241 Reference Manual...
  • Page 50 ECHNICAL PECIFICATIONS This page was intentionally left blank. EF2241 Reference Manual Technical Support: 800.932.2774 ORTEX...
  • Page 51 Par la présente, Polycom Ltd. déclare que ce EF2241 est conforme aux conditions essentielles et à toute autre modalité pertinente de la Directive 1999/5/CE. Dichiarazione di conformità: Con la presente Polycom Ltd. dichiara che il EF2241 soddisfa i requisiti essenziali e le altre disposizioni pertinenti della direttiva 1999/5/CE. Verklaring van overeenstemming: Hierbij verklaart Polycom Ltd.
  • Page 52 Polycom Ltd. förklarar härmed att denna EF2241 överensstämmer med de väsentliga kraven och övriga relevanta stadganden i direktiv 1999/5/EG. EF2241 Reference Manual Technical Support: 800.932.2774 ORTEX...

  • Page 53: Conference System Design

    0 dB or less for the best results. But for difficult acoustic environments, the EF2241, as well as any of the EF products, can handle up to 10 dB room gain, which means that it offers great flexibility in your conference system design.

  • Page 54: Ef2241 Block Diagram

    EF2241 B LOCK IAGRAM EF2241 B LOCK IAGRAM Figure 30. Inside the EF2241 EF2241 Reference Manual Technical Support: 800.932.2774 ORTEX...

  • Page 55: Connector Pinouts

    The RS-232 port is wired as DCE. It accepts a male DB-9 connector. Only pins 2, 3, and 5 are required by the EF2241 but pins 7 and 8 are supported. Con- nect pins straight through (do not use null modem).
  • Page 56 Power Supply Input The power supply input accepts a 5-pin DIN male connector. Only use the power supply provided by Polycom. Use of other power supplies will void the warranty. 1 Ground; 2 Ground; 3 +5Vdc @ 3 A; 4 -15Vdc @ 0.3 A;...

  • Page 57: Connecting Unbalanced Rca To Balanced Mini Phoenix

    Caution! Do NOT connect the shield at both ends. Caution! On the EF2241, Phoenix pin 3 is connected to chassis ground. Under no circumstances should Phoenix pin 3 be connected to pin 1 or to pin 2. Doing so will add noise to the audio signal.

  • Page 58: Additional Notes

    DDITIONAL OTES Caution! Failure to use all four screws to attach the EF2241 to the rack may result in uneven loading and cause a safety hazard. Caution! 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.

  • Page 59: Warranty Information

    Two years. What we will do If your Vortex EF2241 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 Vortex product, we may use new or reconditioned replacement parts.
  • Page 60 (404) 892-2512 for advice about whether we will repair your Vortex product and for other repair information, including charges. Polycom, at its sole discretion, may replace rather than repair your Vortex product with a new or reconditioned one of the same or similar design.

  • Page 61: Definition Of Terms

    The other two mixes can have crosspoint gains on the signals from the other devices. Echo Canceller An echo canceller estimates the echo in an audio signal by using a reference and pre- forms processing to eliminate the echo from the signal. © Polycom, Inc.
  • Page 62 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 Vortex devices. Equalization Equalization is the process of adjusting frequency characteristics of an audio signal.
  • Page 63 The more positive the room gain, the harder the AEC must work to determine which signal is an echo and which is a local speech signal. © Polycom, Inc. EF2241 Reference Manual ORTEX...

  • Page 64: Index

    Digital Bus ...2, 4, 24, 58 Echo Cancellation ...3, 30 EF Bus ...5, 7, 10, 11, 17, 18, 20, ...22, 23, 24, 25, 44, 51, ...58 EF Bus Reference ...25, 28 Equalization ...58 Equalizer ...3 EF2241 Reference Manual ORTEX Technical Support: 800.932.2774 NDEX...
  • Page 65 Outputs ...31 P Bus ...3, 10, 17, 24 Parallel Remote Control ...4, 7 Phantom Power ...7, 15, 30, 44 Phoenix Connectors ...5, 9, 52 Phone ...2, 7, 10, 17, 18, 24, 44, © Polycom, Inc. EF2241 Reference Manual ORTEX NDEX...
  • Page 66 RS-232, Serial Remote Control ...4, 5, 7, 10, 15, 24, 27, ...30, 44, 51 Signal Generator ...2, 3 Submatrix ...2, 22, 24, 34 Technical Support ...43 Terminating the EF Bus, Terminators ...11, 53 Video Codec ...18, 23 EF2241 Reference Manual ORTEX Technical Support: 800.932.2774 NDEX...
  • Page 68 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. P/N 1725-80098-001 Rev C *1725-80098-001-C*...

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