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Microphone assembly

A microphone and interface technology, applied in the structural field of microphone components, can solve problems such as difficult to achieve large dynamic range, adverse effects of acoustic characteristics of microphone components, low electromagnetic interference, etc.

Active Publication Date: 2013-01-02
ST ERICSSON SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a reduction in component size or number can adversely affect the acoustic properties of the microphone assembly
For example, it is difficult to achieve a large dynamic range or low electromagnetic interference (EMI) sensitivity in a compact microphone assembly
Therefore, the need to reduce the size of the microphone assembly conflicts with the requirement for high quality audio

Method used

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Examples

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Embodiment Construction

[0016] The disclosed subject matter relates to microphone assemblies for high quality, low distortion audio reproduction. In particular, the subject matter relates to the construction of microphone assemblies that provide a reduced total number of IC (Integrated Circuit) pins and a reduced number of external components incorporated into the IC. Such a microphone assembly can be implemented in various electronic devices such as cell phones, hearing aids, audio-video recorders, laptop computers, and the like. The microphone assembly is configured to interface with the signal processing circuits of these electronic devices.

[0017] The subject microphone assembly includes a microphone interface that enables direct or capacitor-less coupling of the input from the microphone to the preamplifier. The microphone interface also provides a reduction in the number of external components and eliminates the use of large-size components that can make conventional microphone interfaces bu...

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Abstract

Described herein is a microphone assembly for an electronic device incorporating a microphone. The microphone assembly includes a microphone interface that enables direct coupling of inputs from the microphone to a preamplifier. For the purpose, the microphone interface includes a DC servo loop. The DC servo loop provides a DC path for supplying a DC bias current to the microphone and an AC path to receive the AC output obtained from the microphone. The AC path and the DC path allow separation of the AC output of the microphone from the DC bias current. The microphone interface is implemented using reduced number of IC pin interfaces and external components to achieve compactness of the device.

Description

Background technique [0001] Microphone is a general term used to describe a transducer that converts sound energy into electrical energy, or more precisely, sound waves into electrical signals. In common use, there are a large number of different types of microphones. These microphones use different working principles, such as electrostatics, electromagnetism, piezoelectric effect, etc., so the acoustic characteristics exhibited by these microphones are different. Microphones for specific applications are selected based on acoustic characteristics. [0002] Microphones that provide high-quality sound reproduction are required in various devices and applications, for example, in communication devices such as cell phones and consumer electronics such as tape recorders, hearing aids, and video cameras. In addition, applications such as Internet telephony and recording technology used in the film, television and music industries also require microphones that provide undistorted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H03F3/187H03F3/45
CPCH03F2203/45586H03F2203/45588H03F2200/375H03F3/45928H03F3/45475H04R2410/00H03F3/187H04R3/00H03F2203/45101H03F2203/45136
Inventor 里士・C・阿嘎沃尔夏姆・S・索马亚尤拉莱昂内尔・西马
Owner ST ERICSSON SA
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