VoiceLift System • Features and Operation
20
Tips for Using the Microphones
•
Speak in a normal tone of voice. When the microphone is set properly, your voice is
amplified above ambient room noise.
•
Turn the microphone off while having private conversations.
•
Charge the microphone battery every night. A fully charged battery will last the entire
school day.
NOTE:
Always turn the microphone off before charging.
•
If you are experiencing intermittent audio problems:
•
Check the batteries and replace them if necessary. NiMH and alkaline batteries are
supported.
CAUTION:
Do not charge alkaline batteries.
•
Do not use more than one microphone on a channel.
•
Make sure there are no obstructions between the microphone and the receiver.
Receiver
The VoiceLift VLR 102 Receiver receives infrared signals from the VoiceLift VLP 102
Pendant Microphone. The receiver outputs a balanced -10 dBV line level signal via an
RJ-45 connector.
Integrated DSP
DSP is a specialized circuit that processes audio signals that have been converted to digital
form. The VLR 102 Receiver has a built-in DSP that suppresses feedback while maximizing
sound quality and intelligibility.
As feedback occurs, up to 15 dynamic filters engage, automatically detecting and
eliminating unwanted feedback frequencies. The dynamic filters are notch filters, providing
up to 30 dB of attenuation for feedback frequencies caused either by high microphone
levels, room resonance, or proximity of the microphone to a speaker.
The DSP retains a maximum of 10 filters. After a period of 2 minutes, if the number of
filters is greater than 10, the oldest filters begin to slowly release until the number of
dynamic filters in use equals 10. This process assures that five filters are always available in
case of unexpected feedback. See the
VoiceLift System Installation Guide
for the procedure
to set the dynamic filters.