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  2. Electronic voice phenomenon - Wikipedia

    en.wikipedia.org/wiki/Electronic_voice_phenomenon

    However, there is no indication that Edison ever designed or constructed a device for such a purpose. [6] As sound recording became widespread, mediums explored using this technology to demonstrate communication with the dead as well. Spiritualism declined in the latter part of the 20th century, but attempts to use portable recording devices ...

  3. Comparison of free software for audio - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_free...

    multi-track audio recorder and editor GPL-2.0-or-later: Audacity: Dominic Mazzoni Yes Yes Yes Yes wxWidgets multi-track audio recorder and editor GPL-2.0-or-later, CC BY 3.0 (documentation) Ecasound: Yes Yes Yes Yes limited support through Cygwin: command line audio recorder GPL-2.0-or-later: Gnome Wave Cleaner: Jeff Welty Yes No No GTK+ audio ...

  4. Noise reduction - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction

    In particular, when recording quiet parts of an audio signal, the frequencies above 1 kHz would be boosted. This had the effect of increasing the signal-to-noise ratio on tape up to 10 dB depending on the initial signal volume. When it was played back, the decoder reversed the process, in effect reducing the noise level by up to 10 dB.

  5. Audacity (audio editor) - Wikipedia

    en.wikipedia.org/wiki/Audacity_(audio_editor)

    Audacity is a free and open-source digital audio editor and recording application software, available for Windows, macOS, Linux, and other Unix-like operating systems. [4] [5] As of December 6, 2022, Audacity is the most popular download at FossHub, [8] with over 114.2 million downloads since March 2015.

  6. Sound Recorder (Windows) - Wikipedia

    en.wikipedia.org/wiki/Sound_Recorder_(Windows)

    Before Windows 7, Sound Recorder could save the recorded audio in waveform audio (.wav) container files.Sound Recorder could also open and play existing .wav files. To successfully open compressed .wav files in Sound Recorder, the audio codec used by the file must be installed in the Audio Compression Manager (ACM); Windows installations dating back to at least Windows 95 came with a selection ...

  7. Zoom H2 Handy Recorder - Wikipedia

    en.wikipedia.org/wiki/Zoom_H2_Handy_Recorder

    The H2 Digital Handy Recorder H2 in use as a USB audio input device H2 and H4 with 10 eurocents for scale. The H2 Handy Recorder is a handheld digital audio recorder from Zoom first announced at the NAMM Show in February 2007. It records very high quality digital stereo or 4-channel audio on a hand-held unit, and has been called "the studio on ...

  8. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    It is illegal to use listening or recording devices that are not permitted for public use. Individuals may only use listening or recording devices within reasonable privacy laws for legitimate security and safety reasons. Many people use listening devices on their own property to capture evidence of excessive noise in a neighbour complaint ...

  9. Sound recording and reproduction - Wikipedia

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

    Though no trace of a working paleophone was ever found, Cros is remembered by some historians as an early inventor of a sound recording and reproduction machine. [11] The first practical sound recording and reproduction device was the mechanical phonograph cylinder, invented by Thomas Edison in 1877 and patented in 1878.