It is well known that when people who stutter speak or sing in unison
with others they become more fluent. This well documented phenomenon
is known as the
Choral Effect. The VA601i device uses digital signal processing
technology to electronically reproduce the Choral Effect.
The VA601i uses a technique called Altered Auditory Feedback (AAF)
to recreate the Choral Effect. The VA601i uses two forms of AAF,
Delayed Auditory Feedback (DAF), and Masked Auditory Feedback (MAF)
to enhance fluency.
The VA601i receives the user’s voice signal via a microphone. The voice
signal is then processed by the device and altered using AAF techniques
to produce a choral voice. The choral voice is then played back to
the user via an earpiece.
The VoiceAmp Control Panel software allows the AAF settings to be customized
for individual users.
This new tool (program 4) has recently been added to assist PWS with
blocks or silent blocks; this program emulates the original Edinburgh
Masking device (with some improvements). VoiceAmp has included additional
calibration tools to the Control Panel software PC suite to allow
users to tailor their preferences.
The VA601i system uses a microphone to capture the user’s voice and
then electronically produces a choral voice using AAF techniques.
In everyday situations there are various ambient sounds like other
people speaking, traffic noise, large crowds etc. To prevent the
unwanted sounds from being processed by the VA601i, a programmable
Noise Gate was developed.
The above diagram illustrates the Noise Gate operation. Thesignal on
the left contains both speech and noise sounds. Afterbeing processed
by the noise gate, only the clean speechsounds remain.
The Noise Gate also reduces the amplitude or volume of veryloud sounds.
This prevents unpredictable loud sounds such ashooters going off
from being amplified.
This Noise Gate is fully programmable and parameters including attack,
release and threshold can be adjusted using the ControlPanel software.
For more information on the programmable Noise Gate, consult the
Control Panel Reference Manual or HelpFile.