Improving Teleconferencing with the Right Technology

Improving Teleconferencing
with the Right Technology
RAV 600 & 900
Business Conferencing System
TECHNOLOGY SOLUTION: CLEARONE RAV CONFERENCING SYSTEM
Technology Solution: ClearOne RAV Conferencing System
Document version: 1.1
Last revised: March 22, 2005
This document may not, in whole or in part, be copied, photocopied, reproduced,
translated or reduced to any electronic medium or machine readable form without
prior consent in writing from ClearOne Communications Inc.
All examples with names, company names, or companies that appear in this guide
are fictitious and do not refer to, or portray, in name or substance, any actual
names, organizations, entities, or institutions. Any resemblance to any real person,
living or dead, or organization, entity or institution is purely coincidental.
While every effort has been made to ensure technical accuracy, information in this
document is subject to change without notice and does not represent a commitment on the part of ClearOne Communications Inc. ClearOne makes no warranties with respect to this documentation and disclaims any implied warranties of
merchantability and fitness for a particular purpose. ClearOne shall not be liable
for any errors or for incidental or consequential damages in connection with the
furnishing, performance, or use of this manual or examples herein.
ClearOne, RAV, RAV-Ware, MAX, and XAP are trademarks or registered trademarks of ClearOne Communications Inc., for use in the United States and other
countries. Bose and Articulated Array are trademarks or registered trademarks of
Bose Corp. Other product names may be trademarks or registered trademarks of
their respective owners.
 2005 ClearOne Communications Inc.
1825 Research Way
Salt Lake City, UT 84119
(801) 975-7200 • Fax (801) 977-0087
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
Contents
iv
Technology Solution Overview
Contact Information
v
What is RAV?
Top Features
1
1
Overview of RAV 600 & 900
RAV Fills A Marketplace Void
System Components
ClearOne Product Line Overview
Product Info Box
3
3
4
5
7
Technology Achievements
Adaptive Modeling
Acoustical Echo Cancellation
Noise Cancellation
Look-Ahead Gating
ClearEffect
8
8
9
10
10
11
Hands-On With RAV
Hardware Environment
RAV-Ware Software
12
12
13
Additional Materials
Company Backgrounder
Customers
Product Specifications
17
17
17
18
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TECHNOLOGY SOLUTION: CLEARONE RAV CONFERENCING SYSTEM
Technology Solution Overview
High-quality audio is essential to productive conferencing, as it enables conversations in which people can address important issues and make decisions efficiently.
It’s at the heart of every top conferencing system and successful meeting space.
You have large groups that need to meet with remote groups and individuals, so
your meeting rooms and boardrooms have to support your most critical communications needs. That means equipment selection is crucial. And system ease of
use is key. Every participant has to be able to interact naturally and be heard
clearly—especially in medium to larger rooms, where echo and sound distribution
become big issues. But the average conferencing phone or speakerphone simply
can’t provide coverage and clarity in boardrooms and other large-group meeting
areas, and just doesn’t have enough individual microphones to let people fully participate. In addition, the vast majority of conferencing phones and speakerphones
can’t interface with video or webconferencing systems to enhance the sound quality in meetings using those types of rich media devices.
Until now, a professionally installed system, which typically costs more than
$10,000, was your only option for achieving premium sound quality in your audio,
video and webconferences.
This document discusses a new conferencing solution that delivers top quality
sound, is easy to install and use, and comes at a price significantly below that of
professionally installed systems.
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TECHNOLOGY SOLUTION: CLEARONE RAV CONFERENCING SYSTEM
Contact Information
Sales Contact
ClearOne Communications Inc.
sales@clearone.com
800.707.6994
Additional Information
www.clearone.com
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
1
Part
What is RAV?
Conference calling with professional-quality audio
Everyone is familiar with conference calls. There’s probably a conference-call telephone sitting on a large table in a room just down the hall from your office. Unfortunately, they usually sound awful. Voices drop out or fade away. People sound
like they’re speaking from inside a cave. Conversations are muddled. And when
several people in a room need to speak, well, you know how miserable it can be.
At ClearOne Communications, we’ve developed RAV (we pronounce it “rave”) to
solve the quality problems associated with conferencing phones:
ClearOne’s RAV is a business conferencing system that combines the sound
quality of a professionally installed audio
system with the operational simplicity of
a familiar tabletop conferencing telephone – all for a starting price of $2,599.
RAV is a complete high-fidelity audio conferencing system. It even includes a pair
of top-quality Bose speakers for wall or ceiling mounting. RAV can be used for
audio conferencing, to enhance the audio portion of a video conference, or as a
group audio interface for Web conferencing.
Top Features
What makes RAV different? This section highlights the key features we believe
your audience will find most interesting.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
Superior Audio Experience
•
Audio Clarity. Advanced microphone gating and dynamic acoustical noise
cancellation suppresses unwanted ambient noise.
•
Sound Distribution. RAV includes a pair of high-quality Bose loudspeakers.
And ClearOne’s speech-enhancement technology creates richer sound.
•
Duplex Performance. Distributed acoustical echo cancellation maintains
conversations without the audio cutting out when both parties speak.
Simple Installation
•
Fast Installation. RAV can be installed in less than one hour.
•
Plug & Play. The RAV-Ware configuration software is pre-configured for optimal audio conferencing.
•
Minimal Training. RAV’s operation mimics a telephone. Once installed, its
wireless tabletop controller requires no training to initiate a call.
Flexible and Scalable
•
Network Management. RAV’s built-in HTTP server supports remote
management via the enterprise network.
•
Multiple Applications. With its flexible hardware and software design,
RAV works with the newest multimedia technologies, including videoconferencing and Web conferencing systems, without any modifications or
upgrades.
•
Investment Protection. ClearOne maintains a continuing improvement
program with technology advancements to guard against obsolescence.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
2
Part
Overview of RAV 600 & 900
A look at the product and target market
RAV targets conferencing users who are dissatisfied with their current tabletop
solution. To create a satisfying, high-quality experience, ClearOne’s engineers have
combined telephony, audio, wireless, and networking technologies in a way that’s
never been done before. We believe you’ll find the results unique and affordable.
RAV Fills a Marketplace Void
R AV F I L L S T H E
GAP BETWEEN
TA B L E TO P
CONFERENCING
PHONES AND
HIGH-END
CUSTOM
The teleconferencing market has always consisted of two product types: tabletop
phone units common in conference rooms, and high-end professionally-installed
systems with ceiling- or table-mounted microphones and loudspeakers for corporate executive suites and boardrooms. Only rarely has a product targeted the vast
territory in between.
• Tabletop conferencing phones, though affordable, are problematic. With
an all-in-one unit, speaker and microphones are just an inch or two from
each other. Consequently, echo and audio cut-outs are common. Satellite
microphones can sometimes be added to catch the voices of those more
than a few feet away, but these products do not typically offer satellite
speakers. The result can be a dozen or more people huddled around the
tabletop unit’s speaker to hear the other end of the conversation. The
overall experience is often one of dissatisfaction.
•
Custom-installed systems are better, but far more expensive, often costing
more than $10,000. Microphones can be permanently mounted in the ceiling or flush-mounted in holes drilled into a conference table. Multiple
video and audio sources can be mixed in. These custom-designed systems
are not likely to be approved for rank-and-file employee conference rooms.
•
RAV fits in between. RAV delivers the quality, flexibility, and feature set of
a custom-installed conferencing system in an easily installed, simple to use,
affordable solution. The high-quality Bose speakers are easily mounted on
a wall, away from the microphones, to avoid the possibility of echo. Audio
and video sources can be mixed in. Outputs jacks allow conversations to
be recorded. Call initiation and management is through a wireless desktop
I N S TA L L E D
SYSTEM S
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
control module. And the mixer can be managed though an Ethernet connection to the corporate network (or via a direct USB or serial connection.)
•
RAV delivers immediate benefits. Improved intelligibility means sentences
no longer need to be spoken again and again, leading to shorter calls, reduced user fatigue, and improved productivity. Without the need for call
participants to gather around a single tabletop loudspeaker, frustration levels are slashed. That means employees won’t be conjuring up reasons to
skip a call or leave early.
System Components
RAV is a system that consists of several hardware and software components designed to work with each other. Here’s an overview of the key components.
Audio Mixer
The heart of the RAV system, all
components connect to or communicate with the mixer. It contains
ports for connecting the telephone
line, microphones, an RF antenna (for communicating with the controller),
Ethernet network, and speakers. Connections are also provided for record/playback devices such as a VCR, an external audio amplifier or video codec,
and for using voice tracking to control the movement of a motorized video camera in videoconferencing applications. Internal twin 15-watt, Class D audio amplifiers drive the included Bose speakers. The mixer’s sides are easily removed and
flipped to allow for easy rack mounting.
Wireless RF Controller
THE WIRELESS
CONTROLLER
HAS A 50-FOOT
RANGE TO THE
R AV M I X E R
The elegant RF controller sits on the
desktop or conference table. Emulating a
standard telephone, right down to its familiar user interface, RAV is completely
intuitive to use, even for non-technical
and first-time users, and allows the call
leader to manage calls, program user preferences and adjust various settings. Most
phone-specific functions, such as dialing a call or adding a phonebook entry, are
managed from the RF controller. Alternatively, phonebook and dialer actions can
be performed through the RAV-Ware software. The controller has a 50-foot range
to the mixer unit and runs on four AAA batteries that typically last for six months.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
Microphone Pods
These are the microphones that are placed on the conference table. Two “pods” are included with the RAV 600,
three with the RAV 900. Each pod contains three professional-grade microphone elements with automatic level
control capability. Each pod’s three elements work together to provide full 360° coverage. Multiple pods are
daisy-chained from the mixer using standard Cat5 cables
with RJ-45 connectors (included). Each pod features a
mute button and a pair of LEDs that glow green when the microphone is live and
red when it is muted. Pressing the mute button mutes all microphone pods.
Speakers
One pair of Bose model 161 Articulated Array® speakers and
two 50-foot rolls of speaker wire
are included. These are highquality speakers that are often
used for a home stereo or home theater installation and are driven by the 15-watt,
Class D audiophile-quality amplifiers built into the mixer. Don’t confuse these
speakers with the a.c.-powered speakers used with most computers. (Wall speakers
shown, ceiling-mount speakers are also available.)
Visit Bose at for additional information:
www.bose.com/controller?event=VIEW_PRODUCT_PAGE_EVENT&product=161_bookshelf_index.
RAV-Ware Software
ClearOne’s RAV-Ware software (see screen shots starting on page 13) provides an
easy interface for configuring system settings and customizing the audio in the
RAV 600 and 900 conferencing system. The RAV system is designed to work right
from the box for audio conferencing, but RAV-Ware provides advanced functionality, including the ability to adjust audio speaker levels and equalizer settings, and
to mix and adjust levels of various audio sources. Once installed, RAV-Ware allows
configuration locally through a USB or RS-232 serial connection, or remotely
through a LAN connection.
ClearOne Product Line Overview
ClearOne manufactures and markets three different conferencing solutions: XAP,
RAV, and MAX. Think of RAV as the mid-level product offering. The following
three paragraphs provide a brief summary of each.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
XAP Product
ClearOne’s XAP® installed audio conferencing products are sophisticated, feature-rich systems for boardrooms, convention centers, distance learning facilities,
courtrooms, and other multiuse conference rooms. XAP systems are highly flexible: multiple units can be linked, providing support for up to 64 microphones.
They can be used with virtually any microphone and sound system, and they include the ability to connect to a wide variety of multimedia devices.
For XAP information, visit:
www.clearone.com/product_service/product_detail.php?prodid=13
RAV Product
The solution covered in this reviewer’s guide, RAV is a complete out-of-the-box
conferencing system that includes a mixer, wireless controller, dedicated microphones, Bose loudspeakers, and management software. RAV offers selected features of the XAP line in a simplified form with basic configuration options. RAV
is easy to install, and provides more functionality and far better audio quality than
a typical tabletop conference phone. For installations that do not require the
power and flexibility of XAP, RAV is an excellent solution. RAV 600 includes two
microphone pods; the RAV 900 includes three microphone pods.
For RAV information, visit:
www.clearone.com/product_service/product_detail.php?prodid=196
MAX Conferencing Phones
ClearOne’s MAX® conferencing phones are engineered with the same audio
technology used in the company’s XAP and RAV systems, providing improved
audio performance over other traditional tabletop conferencing phones. With innovative features, including expandability and wireless operation, MAX conferencing phones are a good fit for conducting teleconferences anywhere.
For MAX information, visit:
www.clearone.com/product_service/product_detail.php?prodid=129
For MAX Wireless information, visit:
www.clearone.com/product_service/product_detail.php?prodid=127
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
Product Info Box
The following is a brief summary of the RAV Audio Conferencing System.
ClearOne RAV Summary
In Brief
ClearOne’s RAV audio conferencing system has the
sound quality and flexibility of a professionally installed system but the simplicity of a tabletop conference phone. Installed in less than an hour, its
multi-input mixer can be managed through an
Ethernet connection and features distributed acoustical echo canceling. Call management is via a wireless tabletop control unit. Stylish microphone pods
provide 360-degree pickup of all local participants.
Two Bose loudspeakers complete the system.
Operating systems
supported
RAV-Ware utility software runs on Windows 98 SE,
2000, and XP
In the box
RAV audio mixer with removable rack-mount brackets, wireless RF control console, microphone pods
(2 with RAV 600, 3 with RAV 900), pair of Bose
model 161 Articulated Array® speakers(choice of
wall mount or ceiling mount), power cords and
adapter, CD with RAV-Ware software, Quick Start
Guide, User Manual, hard-copy Quick Start Guide, 4
AAA batteries. Cable assortment: 12’ phone, 7’ and
25’ RJ-45, 6’ USB, 2 50’ rolls of speaker wire, 2 6’
RCA audio cables, 12’ RJ-45 microphone cables. It
also is available without Bose speakers.
Price
RAV 600, $2,599; RAV 900, $3,099
Vendor
ClearOne Communications Inc.
Salt Lake City, Utah
Web site
www.clearone.com
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
3
Part
Technology Achievements
Advanced features in an affordable solution for any location
RAV is not simply a collection of parts. It’s a technology tour de force that brings
features, previously available only in professionally installed systems costing
$10,000 or more, to any conference room, for prices starting as low as $2,599.
ClearOne RAV provides a “natural” audio
experience with intelligibility and sonic
clarity nearly equivalent to conferencing
participants being in the same room.
ADAPTIVE
This section highlights key technology achievements you may wish to share with
your audience.
MODELING
ASSURES
HIGH-QUALITY
AUDIO EVEN
AS A ROOM’S
ACOUSTIC
CONDITIONS
CHANGE
Adaptive Modeling
Description: Adaptive modeling is a signal-processing method of predicting
changes in a room’s acoustical environment through the continuous monitoring of an audio signal’s key parameters. Disruptive audio effects, such as microphone-to-speaker coupling, feedback, and residual echo from reflections
within the conferencing system, can be avoided by applying adaptive signal
processing techniques.
User Benefit: ClearOne’s adaptive modeling technology assures high audio quality
regardless of varying room dynamics, number of participants, seating arrangements, and other environmental factors.
How it Works: An algorithm adjusts the processing threshold based on ambient
noise levels within the room. This ambient noise level changes as the number
of participants increases, as the air-conditioning system cycles on and off, and
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
as other acoustical events occur. The adaptive ambient algorithm monitors
these changes using the microphone pod elements as the pick-up source.
Acoustical Echo Cancellation
ECHO
C A N C E L L AT I O N
PREVENTS
A MICROPHONE
FROM RETRANSMITTING
AUDIO FROM A
LOUDSPEAKER
BACK TO ITS
SOURCE
Description: The key signal-processing technique required for audio conferencing,
acoustical echo cancellation (AEC) prevents the incoming audio being played
through the local loudspeaker from being picked up on the microphone and retransmitted to the remote call participant.
User Benefit: Echo-free calls eliminate the need for participants to repeat themselves,
resulting in briefer calls, reduced telephony use, enhanced productivity, and an
overall improved user experience. ClearOne’s fourth-generation AEC algorithm is
optimized for the group conferencing environment and automatically adapts to
changing acoustical conditions.
How it Works: ClearOne’s Distributed AEC architecture, introduced in 1998, uses
separate acoustical echo cancellers for each microphone element (each RAV pod
contains three elements). Even though the three microphone elements in each
pod are only inches apart, each hears things differently. These differences allow
RAV to build a precise model of the room’s acoustics, allowing creation of a
transparent audio experience.
For the technically minded, AEC is the result of three component technologies,
sub-band computation, TX and RX correlation, and suppression algorithms.
•
Sub-Band Method: ClearOne’s AEC uses the sub-band method for echo
signal computation. An audio sample is segmented into frequency bands
from 20Hz to 20 KHZ. Each band’s unique spectral content can be characterized. ClearOne’s AEC algorithm uses this unique spectral content to make
processing decisions to eliminate unwanted signals and pass desirable signals.
This method minimizes artifacts that result from excessive aliasing with other
computation techniques.
•
TX and RX Correlation: ClearOne has developed comprehensive processing
decision criteria based upon the correlation of transmit-to-receive audio.
Within an audio conference, the transmit (room acoustics) and receive (line
acoustics) conditions change continuously. Common occurrences, such as a
participant increasing the volume or accidentally placing a sheet of paper on
the microphone pod severely impact performance of the echo-cancellation
algorithm. The result may be a mismatch in the room’s acoustical model resulting in echo. ClearOne’s correlation criteria allow the AEC to compensate
for this dynamic change prior to presenting the audio to the far-end.
•
Suppression Techniques: Suppression algorithms are used in conjunction
with AEC processing to eliminate residual echo resulting from mismatches
between the calculated room model and the actual room’s acoustical envi9
REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
ronment. ClearOne’s suppression-processing routines are optimized for audio transparency based on its adaptive modeling. In essence, suppression is
applied to the unwanted echo with minimal impact to the intended audio
signal. Also, the suppression algorithm shares information with the AEC algorithm to reduce the error coefficient associated with the calculated room’s
acoustical model.
Noise Cancellation
CLEARONE
E L I M I N AT E S
SPURIOUS
NOISE WITH
SPECTRAL
A N A LYS I S
INSTEAD OF
A N O I S E G AT E
Description: Noise cancellation eliminates broadband noise sources from sounds
picked up by the microphones. Noise sources include HVAC systems, laptops,
video projectors, and fluorescent lights.
User Benefit: ClearOne’s noise-cancellation technology eliminates unwanted audio signals generated from environmental factors. The company’s noisecancellation algorithm attenuates these noise sources while allowing the voice
signal to pass to the far-end with pristine quality.
How it Works: Most products claiming to offer noise cancellation use a “noise
gate” technique in which the overall signal (the sum of voice and ambient
noise) is attenuated to the device’s “noise floor” as the amplitude approaches
a pre-defined threshold. The threshold is based on the ratio of audio signal
compared to the device’s noise floor. As the signal-to-noise ratio approaches
1:1, far-end participants strain to discriminate voice from noise. This leads to
fatigue and misinterpretation. The noise gate masks the ambient noise in the
room by pushing it below the device’s noise floor, allowing voice to pass.
However, a side effect of the noise gate technique is the common “pumping”
artifact created by the rapid gain changes in the signal as the gate is applied.
ClearOne’s noise cancellation algorithm eliminates these artifacts by using a
different technique. It analyzes the spectral content of the overall signal discriminating voice component from the ambient noise source. Attenuation is
applied only to ambient noise sources with significant spectral energy. Doing
so negates the artifacts caused by rapid gain changes.
Look-Ahead Gating
Description: Look-ahead gating minimizes adverse audio effects created when
multiple microphones are active simultaneously – as they almost always are in
an audio conferencing system. Adverse effects include distortion resulting
from the combination of direct and indirect audio signals arriving at different
microphones at different instances of time with different amplitudes. This
distortion is typically described as a “hollow” or “tunnel” sound.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
User Benefit: Typically, group conferencing environments have multiple participants
speaking sequentially during the meeting. As the conversation proceeds back and
forth, different microphones are activated based on the proximity to the person
speaking. The rapid way microphones are automatically turned on and off can
create unwanted artifacts and can impede intelligibility to the far-end. The far-end
hears clicks, swishing, or completely misses the talker’s first word as the conversation transitions back and forth. ClearOne’s look-ahead gating technology eliminates these artifacts to create natural audio sound to the far-end, regardless of
who is speaking.
How it Works: This effect is minimized by an intelligent method of activating
only one microphone at a time. ClearOne uses a voice-detection process to
determine the best microphone to activate based on the participant’s proximity. All other microphones are attenuated, rendering their audio contribution insignificant. An adverse result from instantly adding gain to the active
microphone is a pumping effect of the noise floor. To overcome this, ClearOne developed look-ahead gating. It delays slightly the audio sent to the farend. This delay is not perceived by the user but allows the gating algorithm to
compensate for rapid gain change artifacts.
ClearEffect
Description: RAV features ClearOne’s ClearEffect technology. ClearEffect provides a natural audio experience, creating intelligibility and clear audio, virtually the same as if conference call participants were in the same room. In
most conference calls, narrowband telephony signals connect the conference
parties. Their poor sonic quality leads to excessive fatigue after an extended
period. This is due to strained listening due to the narrow band of the audio
transport path (telephone). Other experiences are a sense of “unnatural
sounding” participants. We’re all familiar with it: The far-end party does not
sound the same on the telephone as in person. All these effects lead to reduced intelligibility and a potentially ineffective conference.
User Benefit: ClearEffect overcomes many of these anomalies, ensuring the most
productive audio conference with an enhanced user experience.
How it Works: ClearEffect is a signal processing method of emulating wideband
audio on narrowband (200 to 3.3 KHz) telephone signals. ClearEffect leverages the psycho-acoustical phenomenon associated with human listening, and
simulates out-of-band signals through emphasis and delay of the received
telephone signal. The result is an audible impression of a full-band audio signal by the human brain.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
4
Part
Hands-On With RAV
Installation takes just minutes
As you work with the RAV unit, you’ll find that it’s easy to install and configure. In
this portion of the ClearOne RAV Reviewer’s Guide, we’ll discuss the hardware
environment, system requirements, installation, and testing.
Don’t hesitate to contact ClearOne with questions as you proceed. Editorial contacts are listed on page ‘v.’
Hardware Environment
You can manage the RAV mixer from a PC through a LAN connection, or with a
direct USB or serial connection.
As discussed in the System Components section that starts on page 4, RAV consists of a wireless desktop control unit, a mixer, two speakers, two or three microphone pods, and the RAV-Ware software application.
•
To install the RAV unit, refer to the RAV 600/900 Quick Start Guide and
the RAV 600/900 User Manual.
Avoid plugging a LAN cable into the mixer’s microphone port.
Network Information
To use RAV over a local area network (LAN), you need to know if the LAN uses
Dynamic Host Configuration Protocol (DHCP) or if you need a static IP address.
If the LAN uses DHCP, there is no need to make any network adjustments unless
you want to assign a static IP address.
If the LAN does not use DHCP, the following information is needed:
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
•
•
•
IP address to be assigned to the RAV
Subnet mask
IP address of the default gateway
Connecting To The RAV
When you connect the RAV to a network and install the RAV-Ware software on a
Windows-based PC, that computer automatically finds the RAV unit installed on the
same network segment (if DHCP is used).
Optionally, you can connect a PC directly to the RAV using either the USB port located
on the front of the unit or the serial port located on the rear.
RAV-Ware Software
Though the wireless desktop controller is used to initiate calls and manage conferencing sessions, the RAV-Ware software utility is used to manage, maintain, and
configure many different aspects of the mixer. The following screen shots provide
illustrated examples of the features available.
The RAV-Ware►
utility is designed
for easy navigation.
Simply clicking on
an icon displays the
configuration dialog
for that feature. At
the top, the yellow
arrow icon updates
the RAV firmware;
the wrench icon to
its left invokes the
system diagnostics.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
◄ Microphone vol-
umes can be automatic (note here
that Automatic Level
Control is enabled).
Acoustical Echo
Cancellation and
Noise Cancellation
are also enabled.
This screen, from
the RAV 600, shows
two microphone
pods; the RAV 900
supports three microphone pods.
The Bose loud-►
speakers are managed through this
dialog. ClearEffect
enhances the audio
from the incoming
telephone line to
emulate wideband
audio. It does this
by adding high and
low frequencies to
the audio signal,
creating a fuller
sound. Speaker
volume is set with
the horizontal slider,
ensuring that
everyone in the
room can hear the
remote participant.
There’s no more
need for everyone
to huddle around a
tabletop speaker.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
◄ The Mixer Console
allows the user to
create audio mixes
for the different outputs, adjust volume
levels, and view
output meters.
Inputs are shown
along the left side
and outputs across
the top. RAV-Ware
prevents routing
microphone audio
to the loudspeakers,
line in to line out, or
telephone receive to
telephone transmit.
This prevents audio
looping.
While most calls are►
made using the
wireless desktop
controller, they can
also be managed
from the
RAV-Ware dialer
screen. A user can
dial a number, redial
the last dialed call
and disconnect
calls. Line flash,
microphone muting,
and speaker volume
adjustment is also
supported.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
◄ The RAV system
provides voicetracking capabilities
for supported video
cameras through a
VISCA control-port
connection to a PTZ
camera. The camera presets are programmed in RAVWare and assigned
to each microphone
pod. When a specific microphone is
activated, the PTZ
camera moves to
the associated preset position. RAV
900 supports three
camera positions
and a home position; RAV 600 supports two camera
positions and a
home position.
The diagnostics►
dialog provides immediate feedback.
For illustration purposes, the second
microphone pod
was disconnected.
The result is clearly
shown with a red
indicator and text
message.
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REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
5
Part
Additional Materials
This section contains a variety of background materials that you may find useful
as you compile information for your review of the ClearOne RAV system.
Company Backgrounder
ClearOne develops and sells products for audio, video and Web conferencing. The
reliability, flexibility and performance of ClearOne’s solutions create a natural
communications environment, saving time and money by enabling more effective
communications. ClearOne was founded in 1981 as a developer of audio products
for the radio and television broadcast industry. It introduced its first audio conferencing products in 1990 under the Gentner brand. Since then, more than 40,000
units have been installed in customers ranging from Fortune 1000 corporations to
the federal government. The company’s headquarters are in Salt Lake City, Utah
and has offices in London, England; Ottawa, Canada; Hong Kong, China; and
Singapore.
Customers
Who uses ClearOne Products? Here’s a partial list.
Best Buy
Cisco Systems
IBM
National Basketball Association
The Federal Reserve Board
Fidelity Investments
Mayo Clinic
ConocoPhillips
Boeing
Hewlett-Packard
Intel
Nortel Networks
VISA
Pfizer
Merck
Credit Suisse
17
Merrill Lynch
VISA
Morgan Stanley
Goldman Sachs
KPMG
Microsoft
NASA
DaimlerChrysler
REVIEWER’S GUIDE: CLEARONE RAV CONFERENCING SYSTEM
Product Specifications
Loudspeaker
Connection: Left and right push terminals
Power: 10 Watts into 8 Ohm load
Impedance: 8 Ohm
Frequency Response:60 Hz – 15 kHz (+/-1 dB)
Dynamic Range: > 80 dB
THD+N:< 0.5% (+5 dBu line input @ 1 kHz)
Output Level:90 dBSPL output @ 1 meter
Audio Performance
Conditions: Unless otherwise specified,
all measurements are performed with a
22 Hz to 15 kHz BW limit (no weighting)
Audio Mixer
AEC tail time: 128 ms
Adaptive noise cancellation: (6 – 18 dB)
Gating: Adaptive ambient, 1st mic priority,
look-ahead gating, NOM attenuation
Audio bandwidth: 16 kHz with videoconferencing
or other full-band networks
Telephone Interface
Conditions: All measurements taken with
ALC disabled.
Connection: RJ-11 (Set and Line jacks)
Tail Time: 30 ms
Frequency Response:250 Hz to 3.3 kHz (+/- 1 dB)
THD+N:< 0.2% (+7 dBu line input @1 kHz)
Dynamic Range: > 60 dB
Microphone Pod
Coverage: 360 degrees
Connection: RJ-45 with Cat. 5, Link
In/Out Ports
Maximum Distance from Base Mixer:
50' (RAV 900), 75' (RAV 600)
Frequency Response:60 Hz – 14 kHz (+/-1 dB)
THD+N: <0.08% (–45 dBu input @ 1 kHz)
Sensitivity: -45 dBu
Input Level: -6 dBu for 1 kHz 94 dBSPL
microphone input
Dynamic Range: > 65 dB
RS-232 Control Port
DB9 female
9,600/19,200/38,400/57,600
(default)/115,200
Baud rate: 8 bits, 1 stop, no parity
Hardware flow control on (default)/off
Communication I/O
10/100 Ethernet Control Port:
RJ-45 with LED indicators for link,
duplex and activity status.
Line Input
Connection: Unbalanced RCA
Gain: -10 dBu nominal, adjustable from
-14 dB to +18 dB
Nominal Level: -10 dBu
Maximum Level: +9 dBu
Impedance: > 10 kOhm
USB 1.1 Configuration Port
Slave port
VISCA Camera Port
DIN, 9600 baud, no Flow Control
Line Output
Connection: Unbalanced RCA
Nominal Level: -10 dBu, adjustable from
-14 dB to +18 dB
Maximum Level: +9 dBu
Frequency Response:40 Hz – 15 kHz (+/-1 dB)
Dynamic Range: > 80 dB
THD+N:< 0.02% (+6 dBu input @ 1 kHz)
Dimensions (W x D x H)
Mixer: 17" x 7.5" x 2"
(43.2 cm x 19.1 cm x 5.1 cm)
RF Controller: 10.5" x 4.5" x 2.75"
(26.7 cm x 11.4 cm x 6.9 cm)
Mic Pod Diameter: 7" (17.8 cm),
Height: 1.5" (3.8 cm)
Playback/Record Input
Connection: Unbalanced RCA
Gain: -10 dBu nominal, adjustable from
-14 dB to +18 dB
Nominal Level: -10 dBu
Maximum Level: +9 dBu
Impedance: > 10 kOhm
Weight
Mixer: 4.5 lb (2 kg)
RF Controller: 2.0 lb (.9 kg)
Mic Pod: 1.1 lb (.5 kg)
Environmental
Operating Temp: 32-122º F (0-50º C)
Playback/Record Output
Connection: Unbalanced RCA
Nominal Level: -10 dBu, adjustable from
-14 dB to +18 dB
Maximum Level: +9 dBu
Frequency Response:40 Hz – 15 kHz (+/- 1 dB)
Dynamic Range: > 80 dB
THD+N: < 0.02% (+6 dBu input @1 kHz)
Power Supply
Primary Voltage: 100 to 240 VAC
Auto-Sensing, 50-60 Hz
Optional Accessories
Remote Antenna, Credenza, A-D Converter,
Document Camera, Roll-About Cart
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