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2. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   The microphone transducer converts sound pressure from a user's voice into an electric current, which is then converted back to sound by a transducer at the receiver nodes. The most significant distinction between ordinary telephones and sound-powered telephones is in the operation of the microphone.

3. Chirp - Wikipedia

   en.wikipedia.org/wiki/Chirp

   A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time. In some sources, the term chirp is used interchangeably with sweep signal . [ 1 ] It is commonly applied to sonar , radar , and laser systems, and to other applications, such as in spread-spectrum communications (see chirp spread spectrum ).

4. EDO Corporation - Wikipedia

   en.wikipedia.org/wiki/EDO_Corporation

   The Electro-Ceramics business unit provides ceramic-based products for defense and aerospace applications. These include underwater acoustic transducers and arrays for navigation and communication sonars for the US Navy and its prime contractors, seismic and offshore oil exploration, industrial positioning and actuation, and medical devices.

5. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.

6. These Vintage Apple Products Are Worth Way More Than You ...

   www.aol.com/vintage-apple-products-worth-way...

   It was also an incredibly popular Apple innovation, selling 6 million units by the end of its 16-year run. You can currently find a vintage Apple II for $1,000 on eBay .

7. Ionosonde - Wikipedia

   en.wikipedia.org/wiki/Ionosonde

   A chirp transmitter is a shortwave radio transmitter that sweeps the HF radio spectrum on a regular schedule. If one is monitoring a specific frequency, then a chirp is heard (in CW or SSB mode) when the signal passes through.

8. Chirp spectrum - Wikipedia

   en.wikipedia.org/wiki/Chirp_spectrum

   The spectrum of a chirp pulse describes its characteristics in terms of its frequency components. This frequency-domain representation is an alternative to the more familiar time-domain waveform, and the two versions are mathematically related by the Fourier transform.

9. The 20 Black Friday deals AOL shoppers are buying the most

   www.aol.com/lifestyle/most-popular-black-friday...

   Here are the most popular Black Friday deals our AOL readers have been shopping today, including AirPods, smart plugs, Kate Spade bags, and Old Navy coats.