Answered: FIGURE 16.34 The operation of a bat…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The little brown bat is a common bat species in North America. It emits echolocation pulses at a frequency of 40 kHz, well above the range of human hearing. To allow observers to “hear” these bats, the bat detector as shown combines the bat’s sound wave at frequency f₁ with a wave of frequency f₂ from a tunable oscillator. The resulting beat frequency is isolated with a filter, then amplified and sent to a loudspeaker. To what frequency should the tunable oscillator be set to produce an audible beat frequency of 3 kHz?

FIGURE 16.34 The operation of a bat detector.
Microphone
Tunable
oscillator
ww
Speaker Ifi - fal
Mixer
Filter
The mixer combines the signal from
the bat with a sinusoidal wave from an
ocillator. The result is a modulated wave.
The filter extracts the
beat frequency, which
is sent to the speaker.

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