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.

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.

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter54: The Operational Amplifier

Section: Chapter Questions

Problem 7RQ: Name two effects of negative feedback.

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Concept explainers

Strain Gauges

All the components used in civil engineering and mechanical engineering applications undergo deformations due to induced internal stresses under the application of external loads. Under repeated application of loads, there is a high possibility of failure of the components. Hence, periodic monitoring of the components and determination of stresses are very important.

Question

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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