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C
r e a t i o n I n d e x
C r e a t i o n
p a g e 6 6 b
Bats use various frequencies
ranging from 4 to 210 KHz, but mostly between 20 to 80 KHz. Their high
frequency generation system is perfectly suited for identifying small objects.(like
insects).right
down to the cochlea.(inner
ear).having
been specialized for the needed high frequencies in the
ultrasonic
range.
The bat's brain processes
information and forms images by comparing outgoing pulses with the echoes.
From this it knows how far away is the object and its size. The direction
and speed of the object is detected by the different arrival times of the
sound at each ear and by the echo's intensity. Bats have a two signal system;
one being a CF signal.(Constant
Frequency).and
the other being an FM signal.(Frequency
Modulated).signal.
The effective range is three to thirty plus feet. A bat's intensity of
signal can be as low as a whisper, while others, loud like a jackhammer,
but all inaudible.(can't
hear).to
the human ear. The pulse ratio changes too. When searching for prey, its
signals are about 10 pulses per second. After detection, 25 to 50. Upon
contacting the prey, it rises to 200 pulses per second, delivering more
precise information and thus increasing chances of success, his dinner!
