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Balanced audio is typically achieved by TRRRS connectors while unbalanced audio is achieved by TRS connectors. How to know the audio signal output Reference Designations for Electrical and Electronics Parts and Equipment: ASME Y14.44-2008 (Replaced IEEE 200-1975): Section 2.1.5.3. ASME, Fairfield, NJ. 2008. Archived from the original on 2010-03-13.

Jays AB headset for Windows Phone and a note on headset standards". Allaboutwindowsphone.com . Retrieved 26 March 2017. Patching points ( insert points) on a wide range of equipment. An unusual example is the Enigma machine, which featured a plugboard as part of its encryption system.U.S. military versions of the Western Electric plugs were initially specified in Amendment No.1, MIL-P-642, and included: Jays AB headset for Windows Phone and a note on headset standards – "Nokia's Windows Phone 8 devices (Nokia Lumia 520, 521, 620, 720, 810, 820, 822, 920, 925, and 928) use a new universal connector, enabling the use of both AHJ and OMTP headsets." To get unbalanced mono, the sleeve acts as the ground/return wire while the tip carries the audio signal with the ring being an option to carry the mic signal. The TRS connector is commonly used to carry unbalanced stereo signal. Image from Provideocoalition.com 4 Conductor Plugs/TRRS Chapuis, Robert J. (2003). 100 Years of Telephone Switching. Amsterdam, the Netherlands: IOS Press. p.51. ISBN 9784274906114.

Balanced audio is achieved by having two signal wires, in which one carries positive polarity while the other carries negative polarity. Unbalanced audio on the other hand is wired as having one signal wire and one ground/return wire. Loosely defined, audio is the representation of sound – typically using either a level of electrical voltage for analog signals, or a series of binary numbers for digital signals.A two-conductor TS phone connector. The connection to the sleeve is the rectangle towards the right, and the connection to the tip is the line with the notch. Wiring connections are illustrated as white circles. Gary D. Davis and Ralph Jones (1989). The Sound Reinforcement Handbook. Hal Leonard. ISBN 0-88188-900-8. Some of this article's listed sources may not be reliable. Please help this article by looking for better, more reliable sources. Unreliable citations may be challenged or deleted. ( November 2022) ( Learn how and when to remove this template message) a b "The Birthplace of the Telephone | Thomas Sherwin Chapter #14". www.newvision-sherwinpioneers.org. When Phone Operators Were Unruly Teenage Boys". The Atlantic. 19 September 2014 . Retrieved 2017-10-25.

iphone - Why do Chinese EarPods not work with German MacBook Pro?". Ask Different . Retrieved 2020-04-24.

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Headphones also utilize balanced and unbalanced audio. While most headphones make use of unbalanced audio there are deviations. The ring which serves as a conductor introduces the possibilities of balanced or unbalanced mono and stereo signals. The TRRRS connector has three rings and is used in the 4.4 mm pentaconn connector which is scarce. Pentaconn is a combination of two words, Penta meaning 5 and Conn meaning connector. They carry balanced stereo audio to compatible headphones. At the present time, only a few devices come equipped with this connection making it necessary to use an adapter in many cases Equipment requiring video with stereo audio input or output sometimes uses 3.5mm TRRS connectors. Two incompatible variants exist, of 15 millimetres (0.59in) and 17mm (0.67in) length, and using the wrong variant may either simply not work, or could cause physical damage.

If a CTIA headset is connected to a mobile phone with OMTP interface, the missing ground will effectively connect speakers in out-of-phase series, resulting in no voice on typical popular music recordings where the singers are in the center; in this case, if the main microphone button is held down, shorting across the microphone and restoring ground, the correct sound may be audible. [48] Standard Some sound recording devices use a three-conductor phone connector as a mono microphone input, using the tip as the signal path and the ring to connect a standby switch on the microphone. PDAs and mobile phones [ edit ] All iPhone models from the first generation to the 6S and SE (first generation) use a four-conductor (TRRS) phone connector (center) for a wired headset. The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used. Standard Reference Designations for Electrical and Electronics Parts and Equipments: IEEE 200-1975 (Reaffirmed 1988): Section 4.1.5.3. IEEE and ANSI, New York, NY. 1975.

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The number of conductors the phone connector has helps determine the type of audio signal the headphone plug can carry. To achieve balanced mono, one needs TRS connectors.