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2. 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 ...

3. Laser microphone - Wikipedia

   en.wikipedia.org/wiki/Laser_microphone

   [1] [2] Lavrentiy Beria, head of the KGB, had used this Buran device to spy on the U.S., British, and French embassies in Moscow. [ 2 ] On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser ...

4. Soundstream - Wikipedia

   en.wikipedia.org/wiki/Soundstream

   The remaining sixteen tracks were used to record up to eight channels of digital audio – two redundant tracks for each audio channel. The two tracks in a redundant track pair were separated as widely as possible to minimize playback errors due to tape defects (dropouts) – audio channel one was recorded on tracks 1 and 9.

5. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit. Coaxial speakers: These are the most common type of car speakers and are often factory-installed.

6. Digital Audio Stationary Head - Wikipedia

   en.wikipedia.org/wiki/Digital_Audio_Stationary_Head

   In a two-track DASH recorder, the digital data is recorded onto the tape across nine data tracks: eight for the digital audio data and one for the CRC data; there is also provision for two linear analog cue tracks and one additional linear analog track dedicated to recording time code. Digital audio recorders are fundamentally high bit-rate ...

7. Zoom H5 Handy Recorder - Wikipedia

   en.wikipedia.org/wiki/Zoom_H5_Handy_Recorder

   The H5 Handy Recorder. Zoom H5 Handy Recorder is a handheld digital audio recorder from Zoom Corporation, introduced in January 2014. [1] [2] A successor to the Zoom H4n, the new model features interchangeable input capsules with microphones (as does the Zoom H6), allowing the recording of up to four tracks simultaneously, both internal and external.