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Manual de instrucciones Polycom OMNIVS500

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Summary
  • Polycom OMNIVS500 - page 1

    How to Choose an Acoustic Echo Canceller Application Note Polycom Installed Voice Business Group September 2004 ...

  • Polycom OMNIVS500 - page 2

    Introduction Acoustic echo cancellers (AEC) greatly enhance the audio quality of a multipoint hands-free communications system. They allow conferences to progress more smoothly and naturally, keep the participants more comfortable, and prevent listener fati gue. An AEC solution that is poorly designed or inappropriate for the location will not prov ...

  • Polycom OMNIVS500 - page 3

    AEC Nonlinear Processing Mic Speaker Echoes Near speech Far speech Far speech Near speech + echoes + distortion Far End Near End XMT RCV Distortion Figure 1: Illustration of the effects of AEC operation and room acoustics on the transmitted speech. The far speech that trav els through the receive path is not modified as it passes through the AEC. I ...

  • Polycom OMNIVS500 - page 4

    frequently, if at all. With acoustic echo cancellation, the echo path is very complex (dozens or hundreds of reflections), lasts 100-200 ms, and can vary conti nuously during a conversation as people move around the room. Acoustic echo cancellers are therefore much more complicated devices. While line echo cancellers may have smaller price tags, th ...

  • Polycom OMNIVS500 - page 5

    Form Factor The form factor of the solution is very important because it determines how useful it is in an application. The performance of the product may not matter if its fo rm factor makes it inconvenient or impossible to use in the desired application. Of course, there can usua lly be some flexibility in choosing a form factor. Licensing an alg ...

  • Polycom OMNIVS500 - page 6

    Step 2: Eliminate the products that don’t meet G.167 or the tail length needs of the application. It is relatively easy to determine how well an AEC cancels echoes. Most AEC products are based on the same algorithm: the adaptive LMS digital filter. This is a very well-defined algorithm that has been used for years. Since this process is well esta ...

  • Polycom OMNIVS500 - page 7

    Room Acoustics G.167 testing is performed in real rooms. If the product meets the requirements in these rooms, it is compliant. A device that is G.167 compliant in one room, however, might not be compliant in another. This is because the acoustics of all rooms are different. This flexibility allows manufacturers to test their products in the types ...

  • Polycom OMNIVS500 - page 8

    The equation assumes that both the microphone and the speaker are mounted on the same wall (which is the worst case in terms of the number of reflections that will be cancelled). In that case, N must be an odd integer because the even reflections travel away from the microphone. For example, consider a 10x20x30 foot conference room wit h very refle ...

  • Polycom OMNIVS500 - page 9

    Step 3: Judge audio quality and state machine performance by comparative listening. Ideally, the AEC will let speech signals pass through it unharmed. This is actually the most difficult task in both designing and measuring the performance of an acoustic echo canceller. The real difficulty is in determining how the AEC sounds during double-talk, an ...

  • Polycom OMNIVS500 - page 10

    The two most critical states of the echo canceller are receive and double-talk. The receive state is the only opportunity for the echo canceller to converge correctly. It is also the time when the echoes are most noticeable because they are not masked by speech from the other side. During the receive state, the echo canceller must converge rapidly ...

  • Polycom OMNIVS500 - page 11

    acoustics have such a large impact. If this cannot be a rranged, at least consider the operating environment differences in each case in the final decision. If possible, listen to the room acoustics with the echo canceller disabled so the effects of the different rooms can be compared. Seven Things to Listen For • Residual Echo. If there is exces ...

  • Polycom OMNIVS500 - page 12

    A Short Glossary of AEC Related Terms Near end The end of the connection where the echo canceller is located. This is where the echoes take place. Also, see far end . Far end The end of the connection opposite the echo canceller. The user on this end could be using a handset or another hands-free system. This is where the performance of the echo ca ...

  • Polycom OMNIVS500 - page 13

    Technical Support For support on the Vortex product line, call toll-free (USA/Canada) 888-248-4143, then select option 1, then option 3. For exclusive Integrator and Consultant focused suppo rt (through our PASS program), dial 1.408.474.2048; this number will get you help on video and Vortex products. For general technical support, dial 1.800.POLYC ...

Fabricante Polycom Categoría SONAR

Los documentos del dispositivo Polycom OMNIVS500 que obtenemos del fabricante se pueden dividir en varios grupos. Entre ellos están::
- dibujos técnicos Polycom
- manuales de instrucciones OMNIVS500
- hojas de producto Polycom
- folletos informativos
- o etiquetas energéticas Polycom OMNIVS500
Todos son importantes, pero lo más importante desde el punto de vista del usuario de un dispositivo lo encontraremos en el manual de instrucciones Polycom OMNIVS500.

Un conjunto de documentos determinado como manual de instrucciones se divide también en tipos más detallados, tales como: instrucciones de montaje Polycom OMNIVS500, instrucciones de servicio, instrucciones cortas o instrucciones de usuario Polycom OMNIVS500. Dependiendo de la situación debes buscar el documento que necesitas. En nuestra página puedes consultar el manual de instrucciones más popular del producto Polycom OMNIVS500.

Manuales de instrucciones parecidos

El manual de instrucciones del dispositivo Polycom OMNIVS500, ¿cómo debería ser?
El manual de instrucciones, también determinado como el manual de usuario o simplemente instrucciones, es un documento técnico que tiene como objetivo ayudar a los usuarios a utilizar Polycom OMNIVS500. Las instrucciones normalmente las realiza un escritor técnico pero en un lenguaje comprensible para todos los usuarios de Polycom OMNIVS500.

El manual de instrucciones completo de Polycom debe contener unos elementos básicos. Una parte de ellos es menos importante, como por ejemplo: la portada / la página principal o las páginas de autor. Sin embargo, lo demás debe facilitarnos la información más importante desde el punto de vista del usuario.

1. Introducción y pistas sobre cómo orientarse con el manual Polycom OMNIVS500 - Al principio de cada manual se deben encontrar las indicaciones acerca de la manera de usar un manual de instrucciones. Debe contener información sobre dónde encontrar el índice Polycom OMNIVS500, preguntas frecuentes o problemas más comunes – son los apartados más buscados por los usuarios de cada manual de instrucciones.
2. Índice - listados de todos los consejos acerca de Polycom OMNIVS500 que encontraremos en el documento
3. Consejos de uso de las funciones básicas del dispositivo Polycom OMNIVS500 - que deben facilitarnos los primeros pasos durante el uso de Polycom OMNIVS500
4. Troubleshooting - una secuencia sistematizada de acciones que nos ayudará a diagnosticar los problemas más importantes con Polycom OMNIVS500
5. FAQ - las preguntas frecuentes
6. Datos de contacto Información acerca de cómo encontrar los datos de contacto del fabricante / servicio de Polycom OMNIVS500 en cada país si no somos capaces de solucionar el problema por nuestra cuenta.

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