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Designed
for doctors in India, who must travel to rural communities,
the Audiometer Extreme is portable and rugged. The integrated
analog and digital blocks of the PSoC microcontroller
enable the use of fewer support chips, thus reducing the
size and cost of the audiometer.
Key
features of the Audiometer Extreme include: a digitally
generated sine wave at frequencies up to 8 KHz; noise
generated using on-chip PRBS modules; and both narrow-band
and wide-band noise available for masking. The narrow-band
noise is generated from wide-band noise using on-chip
band-pass filter modules. A 2 × 16 LCD displays information
in a clear and logical manner; the LCD contract can be
adjusted digitally. The audiometer also features an on-chip
ADC that generates a bar graph display on the LCD when
the selected input is speech. An on-chip DAC generates
the control voltage for the voltage-controlled amplifier.
The DAC voltage ramps up and down with programmable slopes
so that the interruption of tone or speech is smooth.
Amit
Davjekar
India
amit_dav@satyam.net.in
Abstract
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Full entry &
software (1.7M)
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