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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...

3. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...

4. 2.4 GHz radio use - Wikipedia

   en.wikipedia.org/wiki/2.4_GHz_radio_use

   Many of the cordless telephones and baby monitors in the United States and Canada use the 2.4 GHz frequency, [ 1] the same frequency at which Wi-Fi standards 802.11b, 802.11g, 802.11n and 802.11ax operate. This can cause a significant decrease in speed, or sometimes the total blocking of the Wi-Fi signal when a conversation on the phone takes ...

5. Sound recording and reproduction - Wikipedia

   en.wikipedia.org/wiki/Sound_recording_and...

   Digital recording and reproduction converts the analog sound signal picked up by the microphone to a digital form by the process of sampling. This lets the audio data be stored and transmitted by a wider variety of media. Digital recording stores audio as a series of binary numbers (zeros and ones) representing samples of the amplitude of the ...

6. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.

7. Squelch - Wikipedia

   en.wikipedia.org/wiki/Squelch

   Squelch. Look up squelch in Wiktionary, the free dictionary. In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. [ 1] Essentially, squelch is a specialized type of noise gate designed to suppress weak signals.