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2. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A laser microphone can be used to reconstruct audio from a laser beam shot onto an object in a room, or the glass pane of a window. Researchers have also prototyped a method for reconstructing audio from video of thin objects that can pick up sound vibrations, such as a houseplant or bag of potato chips.

3. Microcassette - Wikipedia

   en.wikipedia.org/wiki/Microcassette

   A Sony M-100MC Voice-Activated Mic n' Micro Microcassette Recorder and a microcassette Microcassettes were sometimes also used for storing digital data. For the programmable calculators of the HP-41-series (from 1979, r.), there was a magnetic tape storage device. Microcassettes have mostly been used for recording voice.

4. Voice-operated switch - Wikipedia

   en.wikipedia.org/wiki/Voice-operated_switch

   It is used instead of a push-to-talk button on transmitters or to save storage space on recording devices. On cell phones, it is used to save battery life. Intercom systems that use a speaker in a room as both a speaker and a microphone will often use VOX on the main console to switch the audio direction during a conversation.

5. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman , the United States Ambassador to the Soviet Union , on August 4, 1945.

6. 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.

7. Call-recording hardware - Wikipedia

   en.wikipedia.org/wiki/Call-recording_hardware

   Modern call recorders can use computer servers, running Microsoft Windows or other operating systems, using interface cards designed for TDM T1 and ISDN-PRI trunks for trunk side recording, and analog and digital station side cards for recording from stations. Often client software is required by the user computer for both screen recording and ...