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2. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   The intended application for a phone connector has also resulted in names such as audio jack, headphone jack, stereo plug, microphone jack, aux input, etc. Among audio engineers, the connector may often simply be called a quarter-inch to distinguish it from XLR, another frequently-used audio connector.

3. Microphone connector - Wikipedia

   en.wikipedia.org/wiki/Microphone_connector

   Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.

4. Audio and video interfaces and connectors - Wikipedia

   en.wikipedia.org/wiki/Audio_and_video_interfaces...

   A phone connector (tip, ring, sleeve) also called an audio jack, phone plug, jack plug, stereo plug, mini-jack, or mini-stereo. This includes the original 6.35 mm (quarter inch) jack and the more recent 3.5 mm (miniature or 1/8 inch) and 2.5 mm (subminiature) jacks, both mono and stereo versions. There also exists 4.4 mm Pentaconn connectors.

5. Intel High Definition Audio - Wikipedia

   en.wikipedia.org/wiki/Intel_High_Definition_Audio

   In the AC'97 design, the audio output is sent to the jack by default. When a headphone is detected, the return signal pins for the speakers are disconnected, directing the audio to the headphone. The jack redirects the audio to the speakers if no headphone connection is detected. Similarly, the return pins ground the microphone jack connection ...

6. XLR connector - Wikipedia

   en.wikipedia.org/wiki/XLR_connector

   XLR3 cable connectors female (left) and male. The XLR connector is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage ...

7. Sound card - Wikipedia

   en.wikipedia.org/wiki/Sound_card

   The output signal is connected to an amplifier, headphones, or external device using standard interconnects, such as a TRS phone connector. [a] A common external connector is the microphone connector. Input through a microphone connector can be used, for example, by speech recognition or voice over IP applications.