A room noise detector could serve as a burglar alarm during the night and when away from home, of course, if no noisy dogs or other pets. It could serve as a child protection device, near a door to the outside of the home or near a swimming pool gate to alert the adults of he child's presence near the pool, or a road with traffic.
examples of internal noise.thermal noise,short noise,i/f noise
Perhaps a two-stage process. Firstly, gain access to the electrical output in the smoke detector, that drives the noise transducer. Use this (amplified?) to drive the mechanism of your electrically-operated lock.
to detect maximum peak os AC signal and convert to DC signal
A Bolometer.
To use the PLL (Phase Lock Loop) as FM detector, you need to know the Free-running frequency.
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A noise detector is a device to use in detecting noise in a certain area or room. Detection device can be set or program accordingly to a desired level of noise or decibels (db) to activate the alarm for the detector,
If you make a noise, a man wearing just boxers will attack you
microphone
1) It can be used as a type of burglar alarm. 2) Someone who needs to know, for example, if a baby is crying.
Your chirping smoke detector is likely making noise because its battery is low or needs to be replaced. To stop the chirping noise, you can try replacing the battery with a new one. If the issue persists after replacing the battery, it may be a sign that the smoke detector itself needs to be replaced.
Noise blocking windows are effective in reducing external noise pollution inside a room by blocking out a significant amount of noise from entering the room.
examples of internal noise.thermal noise,short noise,i/f noise
Noise-proof windows are effective in reducing external noise levels inside a room by blocking out a significant amount of noise from entering the room. The level of noise reduction can vary depending on the quality of the windows and the specific noise sources outside.
The noise cancelling room device is very effective in reducing unwanted sounds in a room by using technology to actively cancel out noise, creating a quieter environment.
by using a metal detector or looking everywhere for it