Technical
Information Information about The EASe
CD Series 1
A wide
array of individuals have demonstrated hypersensitivity to normal sensory
input. This sensory hypersensitivity can be tactile, visual, auditory or
other. Brain-injured children often exhibit sensory control problems.
Auditory and Visual hypersensitivity has been demonstrated by children
with symptoms described as Autistic. Often these and other brain-injured
children exhibit a startle reflex that does not abate with continuation of
normal stimulus. One successful method of desensitizing these children has
been auditory stimulation in the form of transient sounds, (wood blocks,
horn bursts, etc) to randomly stimulate the auditory pathway of the brain
. The transient nature of the stimulation does not over stimulate the
child like a continuing noise might. The frequency of the stimulation
eventually builds enough information in the auditory centers of the brain
to help it reach the next stage of development in which it can control
auditory startle reflexes. Another method of response to this auditory
problem has been the use of electronic auditory stimulation. This method
utilizes a machine which modifies music with random bursts of high
frequency energy to deliver auditory stimulation to the patient. Children
afflicted with auditory hypersensitivity have demonstrated positive
effects. These effects include lessoning of their auditory
hypersensitivity, increased communication and an increase of
affection.
However, this therapy is expensive in both money and
time. It is not available everywhere so parents must travel long distances
and incure travel expenses in addition to the treatment fee itself.
Studies have concluded that in regard to these particular individuals, the
basic signal of the machine is as effective as the signal when input
filter shaping is used (Edelson, et al, 1994). This information suggested
that the signal from the machine could be recorded onto a suitable medium
and distributed to many more individuals than who were presently able to
afford the use of the machine.
In an effort to make this type of
electronic auditory stimulation more affordable to parents of
brain-injured children, Vision Audio Inc. has transferred licensed music
through an auditory stimulation device to Compact Disc with encouraging
results.
To test the electronic viability of such a procedure,
Vision Audio Inc. recently analyzed the performance of the machine. The
procedure was thus.
1. A
white noise source was equalized for constant amplitude and applied to the
input of the machine. The signal level was adjusted for unity gain in and
out of the machine.
2. The machine's sensitivity was adjusted so that
proper level and efficiency action (encoding) was achieved with the given
source signal.3. The resultant signal was digitally encoded and recorded
using a digital hard disc recorder.
4. Fast Fourier Transform analysis
(FFT) of the signal, both directly from the machine (figure 1) and from
the digital hard disc recorder (figure 2) was done and time slices of that
analysis were saved as PICT files.
5. Analysis of the direct output of
the system and the digital recording revealed very little differences in
frequency response or dynamic range.
figure one
figure two
CONCLUSION
The dynamic
range of the the auditory stimulation device exceeded seventy decibles,
the high end performance of analog recording devices. The real story
though was in the high frequency requirements ot the auditory stimulation
device. During the BURST mode the device output a signal exceeding eighty
decible dynamic range at twenty thousand hertz. The only medium capable of
handling that kind of extreme frequency content with acceptable linearity
and distortion is digital.
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