Polycom Webcam 3725 22724 003 A User Manual

Configuring Video and Audio  
Devices for Use with Polycom PVX  
You can select from a number of different audio and video input devices to use  
with your Polycom® PVX™ application, version 8.0.1 or later.  
This document lists the advantages and disadvantages of various devices so you  
can choose the correct one for your environment. It also describes the factors you  
should consider when selecting a video input device.  
Once you have selected your audio and video devices, you need to configure  
them for optimum performance. This document describes how to use the PVX  
user interface to specify the audio and video device settings. If you plan on using  
PVX with the Computer Calling Kit for SoundStation2™ and  
SoundStation2W™, this document also describes how to configure the PVX  
settings for use with this kit.  
The final section of this document provides information on how to resolve audio  
and video issues.  
Choosing and Configuring Video Input Devices  
Polycom PVX supports a wide variety of video input devices. The quality of your  
PVX video largely depends on the quality and design of your video input device.  
These common devices have been tested with Polycom PVX version 8.0.1 or later:  
AVerMedia AVerTV GO 007 FM Plus PCI  
Creative WebCam Live! Motion  
Creative WebCam Live! Pro  
GlobalMedia iREZ KD 1394  
GlobalMedia iREZ K2 USB 2.0  
Logitech QuickCam Pro 4000  
LogiTech QuickCam for Notebooks Pro  
Logitech QuickCam Pro 5000  
Logitech QuickCam Fusion  
Logitech QuickCam Orbit MP  
Veo Velocity Connect  
V-Stream TV2800 (V-Stream Xpert DVD Maker USB 2.0)  
July 2006  
3725-22724-003/A  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Uses this CPU load  
level...  
This device...  
Logitech QuickCam Orbit MP  
Veo Velocity Connect  
V-Stream TV2800 (V-Stream Xpert DVD Maker USB 2.0)  
Driver version 9.0.2  
Medium  
Medium  
Low  
If your device is not listed, you can calculate the CPU load level yourself.  
To determine your video input devices CPU load:  
1. With no other applications running, start Polycom PVX. Make sure that  
there is no call in progress and that you can see video.  
2. Right-click an empty area in the Windows Task Bar, and choose Task  
Manager.  
3. Click the Performance tab, and make a note of the CPU Usage, expressed  
as a percentage of the total CPU.  
4. To determine the CPU usage in MHz, multiply the system’s CPU speed  
by the CPU Usage.  
5. Use this table to determine the level of CPU usage:  
CPU Load  
CPU Usage  
Level  
Description  
< 200 MHz  
Low  
The device’s driver load is equivalent to the load  
for devices supported in earlier versions of PVX.  
For example: A webcam that captures 320 x 240  
video or a PCI video capture card.  
200 - 600 MHz Medium  
Newer devices that support VGA resolutions and  
higher usually compress the video. The device  
drivers must then decode the video before  
sending it to PVX, which increases the CPU load.  
For example: A webcam that captures 640 x 480  
at 30 fps or a DV input device, such as a digital  
camcorder or webcam that supports Firewire/  
IEEE-1394.  
> 600 MHz  
High  
The device is using CPU-intensive features, such  
as face tracking, video special effects, wide-angle  
lens distortion correction, or audio echo  
cancellation.  
For example, suppose your 2.8 GHz computer is running at just over 25% of  
the CPU with no call in progress. Determine the CPU load level as follows:  
2.8 GHz x 25% = 700 MHz of CPU resources in use  
Referring to the table, you see that the camera driver’s load is High.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Specifying Advanced Video Properties  
To optimize the video from your PVX, you need to correctly specify the PVX  
video settings. Before you start, you need to know the CPU load level of your  
video input device. Refer to Determining the CPU Load for Your System for  
more information.  
To specify the advanced video properties:  
1. From the PVX Main page, select Setup > Video > Advanced.  
2. Configure these settings:  
Setting  
Description  
Enable VGA People  
Encoding  
Select if your computer uses less than 15% of the  
CPU when PVX is running and no call is in progress.  
Clear if your computer uses more than 15% of the  
CPU while not in a call.  
Video Quality  
Select Smoother Motion to make video motion  
appear smooth, even though the picture may lose  
detail. Select this option when the call includes  
participants moving around the room and no shared  
documents.  
Select Sharper Image for a sharp, clear picture, even  
though the motion may not be as smooth. Select this  
option when all participants are seated and you need  
to show slides or another type of document during the  
call.  
Enable VGA 30 frames  
per second  
Clear this setting in most cases.  
Select if your device can support VGA at 30 frames  
per second while maintaining a low CPU load. Most  
cameras are not capable of doing this. Supported  
video input devices with this capability include:  
PCI video capture cards  
AVerMedia AVerTV GO 007 FM Plus PCI  
GlobalMedia iREZ K2 USB 2.0  
V-Stream TV2800 (V-Stream Xpert DVD Maker  
USB 2.0)  
For the camera you  
have selected, specify  
the camera driver’s  
load on the system  
Select Low if the device’s driver has little impact on  
the total CPU load.  
Select Medium if the device’s driver moderately  
increases the CPU load.  
Select High if the device’s driver significantly  
increases the CPU load.  
Refer to Determining the CPU Load for Your System  
for more information.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Choosing and Configuring Audio Input Devices  
Note that some special versions of Polycom PVX provide only the video  
portion of calls, while other devices handle audio. This section does not apply  
to these special video-only versions of Polycom PVX.  
Choosing an Audio Input Device  
Polycom PVX offers you the flexibility of choosing from a number of different  
audio input devices. You can use the webcam’s built-in microphone (if your  
webcam includes one), your computer’s built-in microphone, an external  
analog microphone, or a headset.  
The advantages and disadvantages of each of these audio input devices are  
listed in the following table:  
Audio Input Device  
Advantages  
Disadvantages  
Webcam’s built-in  
microphone  
Does not require an external  
microphone  
Some webcams may experience the following:  
Limited audio quality  
Does not occupy additional desk space  
Audio is comparable to traditional  
telephone quality.  
Distance between microphone and  
speakers is usually sufficient to avoid  
interference with audio quality  
Slower computer function  
The camera’s built-in audio echo canceller  
may cause additional CPU load.  
Extended audio delay  
This is caused by the camera’s built-in  
audio echo canceller. It results in a loss of  
synchronization between the video and  
audio, also known as a “lip sync” problem.  
Problems with the Windows® XP echo  
canceller  
This can be caused by routing audio input  
and output through different devices.  
Louder than expected far site sound  
Ineffective audio echo cancellation  
This occurs in calls using cameras with  
sensitive microphones (such as the  
Logitech QuickCam Pro 4000).  
Laptop computer’s  
built-in microphone  
Does not require an external  
microphone  
Limited audio quality  
Audio is comparable to traditional  
telephone quality.  
Does not occupy additional desk space  
Possible feedback or echo  
The structure of the laptop and low quality  
of most laptop speakers can cause  
problems that the Windows XP echo  
canceller cannot correct.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Audio Input Device  
Advantages  
Disadvantages  
External analog  
microphone  
Provides excellent synchronization  
when plugged into the same device as  
the speakers  
Occupies additional desk space  
Limited audio quality  
The Windows XP echo canceller limits  
audio to 7 kHz. This is comparable to  
traditional telephone quality.  
Connecting both the audio and video  
to the computer provides the best echo  
cancellation from the Windows XP  
echo canceller  
Provides maximum flexibility in the  
distance between the speakers and the  
microphone  
Offers a range of choices when  
selecting a high-quality microphone  
with good directionality and frequency  
response  
Headset with  
microphone  
Full 14 kHz audio experience in some  
headsets, since no echo cancellation is  
required  
Limited audio quality in some headsets  
Cellphone and Bluetooth® headsets  
provide quality that is lower than wideband  
PVX audio and is comparable to traditional  
telephone quality.  
Provides a range of choices when  
selecting a high-quality microphone  
with good directionality and frequency  
response  
Possible discomfort of wearing a headset  
Provides maximum privacy  
Supported Headsets  
These common headsets have been tested with Polycom PVX version 8.0.1 or  
later:  
GlobalMedia AMH-300V headset  
GN Netcom 2110-ST 01 USB headset  
Plantronics DSP-400 USB headset  
When a headset is connected, the ring tone for incoming calls is played through the  
default Windows speakers.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Configuring Audio Input Devices  
After you connect your hardware, you need to specify the audio input and  
output devices in the Polycom PVX application.  
To specify the audio devices:  
1. From the PVX Main page, select Setup > Audio.  
2. Configure these settings:  
Setting  
Description  
Audio Output Device  
Select Auto to use the sound playback device specified in  
the Windows Sounds and Audio Devices control panel.  
Select None to use no audio output device.  
Audio Input Device  
Echo Cancellation  
Select Auto to use the sound recording device specified in  
the Windows Sounds and Audio Devices control panel.  
Select None to use no audio input device.  
Select Internal (when using Windows XP) to use the  
Windows XP echo canceller.  
Select External (when provided by external device) to use  
echo cancellation provided by another device.  
Select None to disable echo cancellation if you are using a  
headset.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Using PVX with the Computer Calling Kit for SoundStation2 or  
SoundStation2W  
The Computer Calling Kit allows you to make calls with PVX using a Polycom  
SoundStation2 or SoundStation2W phone. The minimum software  
requirements to use this kit are:  
SoundStation2 conference phone version SS2.CON.01.115 or later  
SoundStation2W conference phone version S2W.CON.01.2xx or later  
To use PVX with the Computer Calling Kit:  
1. Install the Computer Calling Kit as described in the Instructions for  
Computer Calling Kit document, which you received with the kit.  
2. From the PVX Main page, select Setup > Audio.  
3. Configure these settings:  
Setting  
Description  
Audio Output Device  
Audio Input Device  
Echo Cancellation  
Select your computer’s sound card from the list.  
Select your computer’s sound card from the list.  
Select External.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Troubleshooting  
Video  
Symptom  
Cause  
Solution  
The CPU usage is at or above 95%  
when PVX is sending video to the  
far site.  
This is normal operation.  
The desktop capture and encoder are busy running to provide the best  
desktop video quality.  
Slow or freezing video.  
The total CPU Load is too high.  
Adjust PVX to accommodate the video  
input device’s high CPU usage. To do  
this:  
1. Go to Setup > Video > Advanced.  
2. Configure the setting correctly for  
your system and camera.  
For complete information about how to  
set these settings for your particular  
system and camera, refer to the  
Specifying Advanced Video Properties  
section on page 4.  
The system is less than a 2.0  
GHz Pentium 4 or equivalent, and  
it is using most of its resources for  
media processing, leaving few  
resources for other applications.  
Adjust PVX to allocate fewer system  
resources to video processing. To do  
this:  
1. Go to Setup > General >  
Performance.  
2. To reduce the system resources  
allocated to video, select Other  
Applications.  
The device driver for the video  
capture device is using a high  
percentage of the CPU when the  
system is idle.  
Adjust PVX to allocate fewer system  
resources to video processing. To do  
this:  
1. Go to Setup > General >  
Note: This problem can occur  
Performance.  
with some USB 2.0 cameras.  
2. To reduce the system resources  
allocated to video, select Other  
Applications.  
Verify that you have the latest video  
capture drivers for your device.  
Multiple USB cameras are  
connected to the computer.  
Connect only one USB camera at a time  
to your computer.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Audio  
Symptom  
Problem  
Solution  
Unable to access audio adjustment  
settings, such as the Microphone  
Volume slidebar on the Setup >  
Audio page.  
These adjustments are not available  
when the system is in a call.  
Make audio adjustments when the  
system is not in a call and not  
muted.  
The audio from a system using the  
computer’s built-in microphone and  
a webcam is loud and distorted.  
The microphone’s audio gain is set  
too high.  
Enable the Automatic Gain Control  
setting on the Setup > Audio page.  
If this does not work, clear the  
Automatic Gain Control check box.  
Then click the Calibrate  
Microphone button and manually  
adjust the gain control using the  
Microphone Volume slidebar.  
Far-site participants hear an echo.  
The volume is too loud.  
Reduce the volume.  
The microphone and speakers are  
too close together.  
Separate the microphone and  
speakers as far as possible.  
The microphone’s audio gain is set  
too high.  
Go to Setup > Audio and enable  
Automatic Gain Control.  
If you use a laptop’s integrated  
speakers with the laptop’s  
integrated microphone or with a  
webcam’s microphone, the  
structure of the laptop computer and  
the quality of the laptop speakers  
may cause problems that the  
Windows XP echo canceller cannot  
correct.  
Connect external speakers and use  
them instead of the integrated  
speakers.  
In a multipoint call, the audio from a  
Polycom PVX with a webcam  
sounds either too loud or too soft  
compared to the other sites in the  
call.  
The microphone’s audio gain is set  
too high.  
Go to Setup > Audio and enable  
Automatic Gain Control.  
Adjust the microphone manually. To  
do this:  
1. Clear the Automatic Gain  
Control check box.  
2. Click Calibrate Microphone.  
3. Use the Microphone Volume  
slidebar to adjust the  
microphone.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Symptom  
Problem  
Solution  
The audio volume level increases or  
decreases slightly when you start  
the Polycom PVX application.  
This is normal operation.  
The audio returns to its normal level  
automatically.  
When using a SoundStation2 or  
SoundStation2W with the Computer  
Calling Kit, the volume from the  
SoundStation2 or SoundStation2W  
is too loud or too soft.  
The speaker volume is not adjusted  
correctly.  
Adjust your Windows volume control  
settings:  
1. Click Start and go to Settings >  
Control Panel > Sounds and  
Audio Devices.  
2. Click the Volume tab.  
3. In the Speaker Settings section,  
click Speaker Volume.  
4. In the Speaker Volume dialog  
box, adjust the volume, and  
then click OK.  
5. In the Device Volume section,  
click Advanced.  
6. Adjust the Line In volume, and  
then choose Options > Exit.  
The audio is delayed (lip sync is off). The camera is using a large  
percentage of the CPU.  
Determine whether the camera has  
built-in echo cancellation. If it does,  
disable echo cancellation using the  
camera's configuration software.  
Note: This can happen with new  
cameras (such as the Logitech  
QuickCam Fusion or the Logitech  
QuickCam Pro 5000).  
If the camera is using other special  
features (such as face tracking), use  
the camera’s configuration software  
to disable these features.  
If you are using Windows XP, you  
can use PVX internal echo  
cancellation instead. To do this, go  
to Setup > Audio and set Echo  
Cancellation to Internal.  
Copyright Information  
© 2006 Polycom, Inc. All rights reserved.  
No part of this document may be reproduced or transmitted in any form or by any  
means, electronic or mechanical, for any purpose, without the express written  
permission of Polycom, Inc.  
Polycom, Inc. retains title to, and ownership of, all proprietary rights with respect to the  
software contained within its products. The software is protected by United States  
copyright laws and international treaty provision.  
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Selecting Audio and Video Devices for Use with Polycom PVX  
Disclaimer  
This software is provided ‘as is’ with no explicit or implied warranties in respect of its  
properties, including, but not limited to, correctness and fitness for purpose.  
Trademark Information  
Polycom® and the Polycom logo design are registered trademarks of Polycom, Inc.  
PVX™ is a trademark of Polycom, Inc.  
All other brand and product names are trademarks or registered trademarks of their  
respective companies.  
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