Polycom EF2201 Brochure & Specs
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Polycom EF2201 Brochure & Specs

Polycom EF2201 Brochure & Specs

Polycom ef2201 audio: user guide
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Download this manual See also: Reference Manual
Presenting Vortex
Next Generation Voice Conferencing
Application Note
Polycom Installed
Voice Business Group
November 2004
®
Installed Voice Products

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Summary of Contents for Polycom EF2201

  • Page 1 Presenting Vortex Next Generation Voice Conferencing Application Note Polycom Installed Voice Business Group November 2004 ® Installed Voice Products...

  • Page 2: Table Of Contents

    VORTEX EF2280/EF2241 FEATURES AND FUNCTIONS ... 2 VORTEX EF2211/EF2210 FEATURES AND FUNCTIONS ... 3 VORTEX EF2201 FEATURES AND FUNCTIONS ... 4 VORTEX PRODUCTS: WHAT’S NEW... 5 SOME QUESTIONS AND ANSWERS ... 6 SYSTEM BLOCK DIAGRAMS... 17 VORTEX EF2280 INPUTS AND OUTPUTS... 20 APPLICATIONS ...
  • Page 3 We invite you to download the Conference Composer software for your evaluation. You may find it on our website www.polycom.com or e-mail us and we will send you a CD-ROM. For a demo of the Vortex EF2280 or any of our other Vortex products, call the Polycom Installed Voice Business Group anytime at: 1-800-932-2774. Polycom, Inc.

  • Page 4: Vortex Ef2280/Ef2241 Features And Functions

    12 line level outputs on Vortex EF2280; 8 line level outputs on Vortex EF2241 (0dBu nominal level), user adjustable. • Polycom patented noise cancellation algorithms remove steady-state noise signals on microphone inputs (and on telephone line output in Vortex EF2241); user adjustable up to 15 dB of noise reduction.

  • Page 5: Vortex Ef2211/Ef2210 Features And Functions

    3 line level outputs (0dBu nominal level), user adjustable. • Polycom patented noise cancellation algorithms remove steady-state noise signals on mic/line input (and on telephone line output in Vortex EF2211); user adjustable up to 15 dB of noise reduction. •...

  • Page 6: Vortex Ef2201 Features And Functions

    Telephony signals are communicated with a Vortex EF2280 over the digital P-bus channel of the EF bus, eliminating the need for external analog inputs or outputs to/from the Vortex EF2280. • Polycom patented noise cancellation algorithms remove steady-state noise signals on telephone line output; user adjustable up to 15 dB. •...

  • Page 7: Noise Cancellation

    8000 video conferencing system. The VSX remote can be used to control the Vortex products. Special product bundles are available that package the Vortex EF2280 or Vortex EF2241 with these Polycom voice and video products. Ask your Polycom representative for more information.

  • Page 8: Some Questions And Answers

    What makes the Vortex AEC better? The Vortex AEC has been designed to get the best trade-off between full-duplex audio (quick interaction of both sides of a conversation and having both sides hear each other) and removal of echo when both sides of the conversation are moving about their rooms while both sides are speaking.
  • Page 9 AEC and will not be removed. The remote talkers will always hear a delayed version of their audio if the echo length of the local room is larger than the tail time of the local echo canceller.
  • Page 10 mixed together, sound like random background noise. Certainly combinations of these types of signals can also be effectively removed such as the noise from power drills – there is a combination of periodic signals and random noise. The types of noise that the Vortex noise canceller cannot remove include short impulsive noises, like a hammer blow, which are not present over a long enough time window to have the algorithm adapt and remove it.
  • Page 11 Should I leave the AGC on all the time? Yes. We have done extensive testing of the AGC and it can dramatically improve the quality of an audio conference. We recognize that your experience from other AGC’s may not be that favorable, but we definitely suggest you leave the Vortex’s AGC on all the time because it is very robust.
  • Page 12 Why is that different? Previous products gave you no choice in how inputs were mapped to outputs. You took the full strength audio or possibly mapped full strength inputs into a sub bus and then you could use the sub bus. That technique forced you to think differently –...
  • Page 13 Vortex can get any of these signals off the bus. With the addition of the P bus on the telephony products, up to 8 EF2280’s and 8 EF2201’s can be linked together for a total of 16 devices. The W, X, Y, and Z busses include NOM information and are most often used to link microphones between devices, but can also be used to share line level sources between devices.
  • Page 14 RS-232 Control Questions Will RS-232 work with AMX and Crestron? Yes. Absolutely. Polycom has provided all the programming information to AMX & Crestron and macros are available. What can I control via RS-232? Absolutely everything. Every feature in the Vortex has an RS-232 command and documentation as to how to control the feature.
  • Page 15 This information can be used for camera positioning. What about IP addressing? Polycom has an IP accessory, the Vortex Ethernet Interface, that can be used to configure the Vortex devices remotely. Logic Control Questions How do you address logic pins? How many controls can you have? The product has 24 logic input pins and 20 logic output status pins.
  • Page 16 Preset Questions How many presets are in the Vortex? There are 16 factory presets and 32 user presets for a total of 48 presets. The presets store all the information in the device including input gains, matrix cross points. Also, each device stores a complete set of text labels of inputs, outputs, macros, presets, and logic pins.

  • Page 17: General Questions

    (the ability to handle positive room gain), and the AGC (to increase the signal level) allows you to use ceiling microphones and loudspeakers and have your audio conferencing system work well. While we can’t break the laws of physics, we can at least make ceiling microphones work the way you would like them too.
  • Page 18 Yes, you can link up to eight Vortex devices in any combination with one exception. If you are using multiple Vortex EF2201 telephone hybrids, up to eight of them can be linked to up to eight Vortex EF2280 units. The reason is that the...

  • Page 19: System Block Diagrams

    7kHz or even 15kHz. With the Vortex, conferencing can now sound as good as the face-to-face experience. By designing the system this way, all the program audio and other sound reinforcement audio will have 22kHz audio bandwidth. This opens up the possibility of full bandwidth audio conferencing over broadband connections.
  • Page 20 EN (Echo Canceller, Noise Canceller) Ungated Echo Noise Mute Gate Gated Canceller Canceller Parameters Parameters EC1, EC2, Bus Figure 4. The channel processors for each of the 1-8 mic/line inputs. Each of the 8 mic/line inputs has the EN processing block that is shown in Figure 3. The balanced input signal passes through a digitally controlled, analog gain stage, is converted to a digital signal and then processed by the acoustic echo canceller, the noise canceller, the automatic gain control, the parametric equalizer, and then the automatic mixer.
  • Page 21 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. Enters the menu and allows you to select and change parameter values. Esc.

  • Page 22: Vortex Ef2280 Inputs And Outputs

    Ref 1, Ref 2, or the EF Bus external reference. Ref 1 and Ref 2 can be built from any of the input signal by using the main matrix. The AEC reference should contain the appropriate mix of remote talker signals (such as the codec audio and phone add audio) with the local program audio.
  • Page 23 Line Inputs A-D As with the microphone/line level inputs, balanced audio appears at the rear panel mini Phoenix™ connector (3.5mm spacing). As shown in Figure 9 the signal level is adjusted to match the nominal level of the line level input in the analog domain – this ensures that the signal to noise ratio of the signal is preserved.
  • Page 24 NOM attenuation, followed by the output filtering, signal delay, and signal mute and then conversion from a digital signal to a balanced analog audio signal. When viewing the output signal meter on the Vortex front panel or via the Conference Composer software, the output meter shows the signal level just prior to conversion to an analog signal at the D/A converter.

  • Page 25: Applications

    Several application notes and other resources are available discussing the various Vortex applications, product setup, matrix settings, and system configuration. Check out these documents (all available via the Polycom Resource Center on the internet): Vortex – VSX...

  • Page 26: Automatic Microphone Mixing

    Hold Time values that are too high. 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 27 Microphone activation There are two modes of microphone activation for an input that is assigned to one of the two automixers: auto gate, or forced- on/forced-off. In auto gate mode, a microphone will gate on or off depending on the signal activity and the settings for that input channel and for that mixer.

  • Page 28: Audio Matrixing

    One of the most important features of the Vortex is the full bandwidth full cross point matrix. Not just a router, the Vortex’s full matrix allows audio from any input to be changed in gain and mapped to any output. No longer do you have to be constrained with using a sub-bus to change the gain of groups of input signals.
  • Page 29 Line Inputs The line inputs to the matrix are typically inputs from video codec signals or program audio devices such as VCRs or DVDs. In a typical application these signals must be heard in the local room and can be mapped through the matrix to outputs.
  • Page 30 This bus is the same as the Y bus and can be used for sending any signal between different devices. This bus also can be used for sharing microphone information. Typically applications may be for sending stereo program audio between devices (one channel on the Y-bus and one channel on the Z-bus).
  • Page 31 D evice ID : M i c/ L i n e In p u t s L i n e In p u t s Si gn al Gen erat o r Figure 14. The matrix worksheet including the full matrix and the EF Bus sub matrix. You can use this matrix to design your input and output mappings.

  • Page 32: Presets And Macros

    The Vortex has built-in non-volatile storage that can store 16 factory default presets, 32 user presets, and 256 user macros. A preset is a complete setting for the Vortex and stores over 2,000 user configurable parameters such as mic/line gains, filter parameters, matrix cross points, etc.

  • Page 33: Serial Remote Control

    The Vortex has been designed to be configured with a PC via the RS-232 port and the included Conference Composer software and then operated with the RS-232 connected to a remote control system. As with previous EF products, multiple devices can be linked together and controlled via a single RS-232 connection.

  • Page 34: Conference Composer Software

    Conference Composer makes using the Vortex simple and intuitive. Conference Composer operates under Windows™ NT, 2000, and XP. A powerful addition to Conference Composer is our InstantDesigner setup wizard. For more information on the Polycom InstantDesigner, see the next section or check out our application note on InstantDesigner.
  • Page 35 (output 2) in the room. The echo canceller reference R1 included both the codec audio (input C), the phone add audio (input PM0) and a mono sum of the left and right program audio. The program audio is attenuated by 3dB before adding it into the R1 output.
  • Page 36 Figure 20. The full cross point matrix for a system using a phone add, a codec, and stereo program audio. All cross point gains are in dB. Grayed cells are muted.

  • Page 37: Polycom Instantdesigner V 2.0

    We have learned both the easy way and the hard way what works and how to best use the Vortex products. By making Polycom Error! Bookmark not defined. available to you, the A/V specialist, we want to make your job easier and allow you to spend more time doing the things that can help your design and integration firm be more profitable.
  • Page 38 Once the project has been created, it is a simple matter to go into Conference Composer and make any desired final changes to the system. You can practice (or just play) with the InstantDesigner wizard by downloading Conference Composer from the Polycom Resource Center.

  • Page 39: Front Panel Control

    Using a PC with the Conference Composer / InstantDesigner software is the easiest way to configure the Vortex. However, since the user may not always have a PC available, it is possible to control many of the functions directly from the front panel interface. System Inputs 1-8, A-D Acoustic Echo...
  • Page 40 you reach the end, but parameters that adjust numeric values will not wrap around once the maximum or minimum value is reached. While adjusting a parameter, the UP/DOWN button must be held down briefly before the repeat rate increases.

  • Page 41: Remote Control: Logic Input And Output Pins

    A simple example of a macro being assigned to a logic pin would be to raise or lower a stereo volume control based on a single logic input. The macro would raise or lower the volume of the left and right program audio each time it executed.

  • Page 42: Linking Multiple Devices

    The EF bus is a high-speed network protocol that allows up to 8 Vortex units (any combination) to be linked together – in addition, up to 8 EF2280’s and 8 EF2201’s can be linked together for a total of 16 devices. The EF bus is used for both command and control information between devices and for high speed data linking.
  • Page 43 Program L signal (the left channel of the program audio), and output Z is the Program R signal (the right channel of the program audio). That’s all there is to do to put signals on the expansion bus. The W, X, Y, and Z signals from EF2280:00 can now be used by other linked Vortex devices.
  • Page 44 When Mix-Minus is not enough The example in the previous section showed how the expansion signals (P, W, X, Y, and Z) from multiple Vortex devices could be used to send signals from one device to another.. What if you don’t want to use a mix of all the W signals from the linked devices, but only want the W signal from device 2? What if you just want the Y signal from one of the devices, such as from device 0, but not from device 7? The answer is in how the sub-matrix is used.
  • Page 45 EF2280:01 is using the bus reference as shown in the figure. -3 dB -6 dB -6 dB -9 dB 5 6 7 8 9 10 11 12 EF2280 POLYCOM EF Bus CHANNEL ACTIVITY -9 dB 13 14 15 16 ORTEX POLYCOM CHANNEL ACTIVITY...
  • Page 46 Now that each Vortex has put its microphones on the W and X bus respectively, let’s look how we can accomplish the voice lift application on each Vortex. For this example, we will assume that two of the zone outputs are coming from each Vortex. Vortex EF2280:00 Configuration We specified in Figure 23 that in Zone 1 we want the Zone 2 microphones reinforced at a level of -9dB, the Zone 3 microphones reinforced at a level of –6dB and the Zone 4 microphones reinforced at a level of -3dB.
  • Page 47 (Zone 1 and Zone 2 microphone inputs 1-8), the Zone 3 microphones (WM0), and the Zone 4 microphones (XM0) are summed and sent to the codec on output A and are placed on the bus to be sent to the Phone interface (an EF2201 in this example) which also take the four zones of microphone audio off the bus and create a sum of these signals before sending it to the telephone line.
  • Page 48 Figure 28. The sub-matrix for Vortex EF2280:00 which will feed the main matrix to create the local outputs for Vortex 0: Zone 1 output and Zone 3. Combination signals WM1 and XM1 contain the microphones from Zone 2 and 4 that need to be sent to the Zone 1 amplifier and combination signals WM2 and XM2 contain the mixes of microphones that need to be sent to the Zone 3 amplifier.
  • Page 49 The main matrix for Vortex EF2280:01 is shown in Figure 30. In this figure, we see that the only local outputs are to the Zone 2 and Zone 4 amplifiers. The EF bus is used to send the microphone audio to the telephony interface and to send these same microphone zones to EF2280:00 to be played out into Zones 1 and 3.
  • Page 50 Figure 30. The main matrix for Vortex EF2280:01. InstantDesigner will created all the bussing matrices and the complete system configuration that was described in this example. By simply entering in the appropriate attenuations for using the microphones in the different loudspeaker zones, the overall configuration was automatically created.

  • Page 51: Mechanical Specifications

    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 (3.5mm) quick connect terminal blocks RS-232: DB9F EF Bus In/Out: RJ45 Control/Status: DB25F ELECTRICAL SPECIFICATIONS Power: 110 - 240 VAC;...
  • Page 52 Specifications on other Vortex products can be found on the rear page of the product data sheets. Copyright © 2004 Polycom, Inc. All rights reserved. Printed in the United States of America. No part of this document may be reproduced in any form or by any means without written permission from Polycom, Inc. Due to technical progress, specifications are subject to change without notice.

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