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Apparatus and method for driving headphones differentially in mobile applications

A technology of plugs and sockets, applied in the field of mobile devices

Inactive Publication Date: 2017-07-28
ESS TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, all such known devices provide a common ground signal return and therefore also suffer from the described audio signal quality problems

Method used

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  • Apparatus and method for driving headphones differentially in mobile applications
  • Apparatus and method for driving headphones differentially in mobile applications
  • Apparatus and method for driving headphones differentially in mobile applications

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Embodiment Construction

[0035] This document describes an apparatus and method by which improved sound quality can be achieved from mobile "hi-fi" playback devices by driving compatible earphones with a left channel signal and a right Instead of having a common ground return path, the channel signal has a separate ground return path via the standard size headphone connector on the device, while retaining full compliance with traditional plug connections and traditional headphones. The type of headphones or other reproduction device connected to the playback device can be determined by the controller, and the playback device can be configured to produce an audio output appropriate for the connected device.

[0036] Some high quality headsets for applications other than mobile devices have separate left and right channel signal return paths instead of being commonly connected as in mobile devices. Audio equipment professionals often refer to the use of separate signal return paths as a "balanced" or "d...

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Abstract

An apparatus and method is disclosed for achieving improved sound quality from mobile 'hifi' playback devices by driving compatible headphones in 'balanced' or 'differential' mode via standard size headphone connectors on the device, while retaining full compliance with legacy jack connections and conventional headphones. When a headphone is connected, a smartphone may determine whether the headphone is one capable of accepting balanced audio signals, or one that uses a conventional 3-pole jack or a 4-pole CTIA or OMTP jack. For a headphone that accepts balanced audio signals, the four poles of a 4-pole jack are used to drive left and right audio channels, and inverted left and right audio channels. For conventional 3-pole or 4-pole jacks, switches in the smartphone adapt the audio output signals to the configuration expected by the headphone.

Description

[0001] This application claims priority to U.S. Provisional Application No. 62 / 217,585, filed September 11, 2015, and U.S. Provisional Application No. 62 / 309,924, filed March 17, 2016, the entire contents of which are incorporated herein by reference middle. technical field [0002] The present invention relates generally to mobile devices, and more particularly to driving headphones through an analog output port in such mobile devices. Background technique [0003] It is common today for people to listen to music using mobile devices such as smartphones or other mobile media players (collectively referred to as "smartphones"). Users have quickly become accustomed to playing music through such devices, and generally users tend to keep their smartphones with them at all times. At least many, if not the vast majority, of these users want to be able to listen to music with high sound quality. Smartphone manufacturers have realized this, and many have introduced "high fidelity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00H04R5/04
CPCH04R5/04H04R29/001H04R2420/01H04R2420/05H04R2499/11
Inventor 达斯廷·达勒·福曼彼得·约翰·弗里思弗雷德里克·施里韦黄·苏·绍恩
Owner ESS TECHNOLOGY