environment. In general, we recommend LDS off and
the narrow field of view for speech recognition
applications.
Using a narrow field of view and LDSTM can also be
useful when teleconferencing. If the incoming talker’s
speech is pla ed through loudspeakers positioned
outside the +/- 45 degree listening area, the arra will
turn off when onl the far-end talker is active, thereb
minimizing echo in the channel.
Position Lights
The green position lights provide feedback on the
operation of the arra . The indicate where the arra ’s
listening beam is pointing. When the arra recognizes a
relevant sound, one of the 5 lights will be illuminated.
The individual lights correspond to the range of potential
sound source locations. For example, if a talker is
directl in front of the arra , the middle light will be
illuminated. If the talker is to one side, a light on that side
will turn on. If the talker moves across the field of view of
the arra , the lights will track the talker’s motion. When
two users are sharing the arra , the light will indicate the
direction of the active talker. In the narrow scanning
range mode, onl three lights are active. When there is
no active talker, the lights ma flicker as the Voice
Tracker TM searches for a talker.
When the LDS is on, the indicator light will be illuminated
onl when there is sound activit within the designated
listening area. With the LDS off, a light will remain on
continuousl through both speech and silence periods.
In the event that no lights are on and the LDS mode is
off, it is possible that the arra is not plugged in or is
working improperl .
Using the oice Tracker for Speech Recognition
Since the Voice TrackerTM operates differentl from other
t pes of microphones or audio input devices, ou should
retrain our speech recognition s stem after connecting
the arra and adjusting the soundcard gain level. This
will allow ou to more effectivel utilize the improved
sound qualit produced b the Voice TrackerTM and will
improve the overall performance of our speech
recognition software. Be sure to select mic in during the
“New User” setup. Personalized vocabular can usuall
be transferred to the retrained “User”.
Adjusting Your Soundcard
On our Windows PC:
1. Go to Start button, Programs, Accessories,
Multimedia (or Entertainment), then volume control.
2. Make sure the Mic In’s mute is checked.
3. Go to Options, then Properties, select the circle next
to Recording.
4. In the ‘Show Volume Controls’ region check the box
next to Mic In and then click OK.
5. Check the Select box under Mic In and set its
volume to an appropriate level for our soundcard.
Be careful not to set this volume level too high. This
will cause clipping.
6. Exit recording control.
Trouble shooting:
- Audio cuts out: Be sure LDS switch is in off
position
- No audio. Check whether green lights track the
talker. If so, the problem is probabl in the
computer. Make sure it is looking for recording
input where the Voice Tracker is connected (mic
in or USB)
FCC & CE Mark Compliance
This equipment has been tested and found to compl the
limits for a Class A digital device, pursuant to part 15 of
the FCC rules as well as the CE Mark rules. These limits
are designed to provide reasonable protection against
interference when the equipment is operated in a
commercial environment. This unit generates, uses and
can radiate radio frequenc energ , and if not installed
and used in accordance with the instruction manual, ma
cause harmful interference with radio communications.
Changes or modifications not expressl approved b
Acoustic Magic could void the user’s authorit to operate
the equipment.
This digital apparatus does not exceed the Class A limits
for radio noise emissions from digital apparatus as set
out in the Radio Interference Regulations of the
Canadian Department of Communications.
If ou have further questions, e-mail us at
Or call 978 440 9384.
ACOUSTIC MAGIC, INC.
35 Peakham Road
Sudbur , MA 01776
www.ACOUSTICMAGIC.com
