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2. 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 ).

3. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   Since the microphones used in most telephones are designed to modulate a supplied electric current they cannot be used in sound-powered transducers. Most sound-powered telephones use a dynamic microphone. A common approach to transducer design is the balanced armature design because of its efficiency. The number of simultaneous listeners is ...

4. Chirp spread spectrum - Wikipedia

   en.wikipedia.org/wiki/Chirp_spread_spectrum

   In digital communications, chirp spread spectrum (CSS) is a spread spectrum technique that uses wideband linear frequency modulated chirp pulses to encode information. [1] A chirp is a sinusoidal signal whose frequency increases or decreases over time (often with a polynomial expression for the relationship between time and frequency).

5. Chirp spectrum - Wikipedia

   en.wikipedia.org/wiki/Chirp_spectrum

   The stationary phase method does not predict or deal with Fresnell ripples, so it is unable to offer any means by which these ripples can be minimized. As an example, the figure below shows a chirp spectrum with T. Δ F =250 obtained for a non-linear chirp aiming to match the Hamming window, using the methods described above. The figure shows ...

6. 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.

7. Orthomode transducer - Wikipedia

   en.wikipedia.org/wiki/Orthomode_transducer

   Orthomode transducer, VSAT K u band Outdoor unit, includes feed horn, OMT, LNB and BUC Orthomode transducer (Portenseigne, France) Orthomode transducer, vertical and horizontal polarity Antenna side of OMT. An orthomode transducer (OMT) is a waveguide component that is commonly referred to as a polarisation duplexer.