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Voltage vs. time of sine waves at reference and line levels, with V RMS, V PK, and V PP marked for the +4dBu line level. A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level ...
The following electrical connectors are commonly used in aviation headsets: [1] Phone connectors. A pair of plugs, known as "GA" or general aviation plugs. 1/4-inch plug for audio (PJ-055), and a 3/16-inch plug for the microphone (PJ-068)
The 1999 PC System Design Guide's color code for 3.5 mm TRS sockets is common, which assigns pink for microphone, light blue for line in, and lime for line level. AC'97 and its 2004 successor Intel High Definition Audio have been widely adopted specifications that, while not mandating physical sockets, do provide specifications for a front ...
† Although the mic input is usually mono, the input is still a TRS phone socket. Many mono 'computer' mics are fitted with TRS plugs. The tip is for the MIC and the ring is for power (to power an electret-condenser style MIC). There are exceptions to the above: Hosa cables use grey and orange for left and right analogue channels.
RCA or BNC: TOSLINK: Output level 2–7 V peak to peak 1.0–1.2 V peak to peak 0.5–0.6 V peak to peak — Min. input level 0.2 V 0.32 V 0.2 V — Max. distance 1000 m 100 m 10 m Modulation Biphase mark code: Subcode information ASCII id. text SCMS copy protection info. Audio bit depth: 24 bits 20 bits (24 bits, optionally) [citation needed]
This is the most commonly used profile, providing support for the popular Bluetooth headsets to be used with mobile phones and gaming consoles. It relies on SCO audio encoded in 64 kbit/s CVSD or PCM and a subset of AT commands from GSM 07.07 for minimal controls including the ability to ring, answer a call, hang up and adjust the volume.