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.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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.
Transcribed Image Text: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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