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2. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   Directional models: These AHDs are characterized by their ability to create long-range, directional voice communications and warning tones. Their directionality is typically 5° to 60° radius conical at a 2 kHz tone. Omnidirectional models: These acoustic hailing devices are capable of creating 360° voice communications and warning tones.

3. Sound recording and reproduction - Wikipedia

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

   Frances Densmore and Blackfoot chief Mountain Chief working on a recording project of the Bureau of American Ethnology (1916).. Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects.

4. Binaural recording - Wikipedia

   en.wikipedia.org/wiki/Binaural_recording

   Binaural recording is a method of recording sound that uses two ... cheaper methods of recording and the general increased commercial interest in 360° audio ...

5. Variable Control Voice Actuator - Wikipedia

   en.wikipedia.org/wiki/Variable_Control_Voice...

   The term Variable Control Voice Actuator (VCVA) refers to a digital recording technology developed by Olympus, which is implemented in many of their digital voice recorders. [1] It prevents the recording of silence, so pauses in a speaker's dictation do not waste time, power or recording space.

6. History of sound recording - Wikipedia

   en.wikipedia.org/wiki/History_of_sound_recording

   Ring-and-spring microphones, such as this Western Electric microphone, were common during the electrical age of sound recording c. 1925–45.. The second wave of sound recording history was ushered in by the introduction of Western Electric's integrated system of electrical microphones, electronic signal amplifiers and electromechanical recorders, which was adopted by major US record labels in ...

7. Dashcam - Wikipedia

   en.wikipedia.org/wiki/Dashcam

   For Bluetooth and voice commands and recording, a built-in microphone is included. 4G triple-cam (also called triple-lens and three-way-cams) sets on rearview mirror are becoming more available (2 front cameras - one 170° to mainly record road, one 360° for sides and doors and a rear camera).