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Fldigi (short for Fast light digital) [4] is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem.The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.
The MARS programs also include active duty, reserve, and National Guard units; and Navy, Marine Corps units. [1] MARS has a long history of providing worldwide auxiliary emergency communications during times of need. The combined two-service MARS programs (Army, and Air Force), volunteer force of over 3,000 dedicated and skilled amateur radio ...
It recorded sound signals on a thin steel wire using varying levels of magnetization. [1] [2] The first crude magnetic recorder was invented in 1898 by Valdemar Poulsen. The first magnetic recorder to be made commercially available anywhere was the Telegraphone, manufactured by the American Telegraphone Company, Springfield, Massachusetts in 1903.
NASA's Perseverance rover recorded a wind gust on Mars with its onboard microphone, sending the recording back for humanity's fist time hearing the wind on Mars.
A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...
Ambient noise data collected by the InSight lander's seismometer gives us a detailed look at what lies right underneath its surface. Scientists used Mars' ambient noise to map the planet's ...
The Panasonic RQ-J20X portable cassette player from 1982 was the first device to implement the dbx integrated circuit. The original dbx Type I and Type II systems were based on so-called "linear decibel companding" - compressing the signal on recording and expanding it on playback.
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