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Microphone system with high acoustic overload point

A microphone and node technology, applied in microphones, electrostatic transducer microphones, transducer acoustic response prevention, etc., can solve the problems of sensing voltage with unexpected DC offset, reducing circuit AOP, reducing sensing voltage, etc.

Active Publication Date: 2021-11-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One disadvantage of circuit 1 is that the sense voltage at node 40 typically has an undesirable DC offset
[0007] Another disadvantage of circuit 1 is that at high signal levels the diodes 20, 30 will clip the sense voltage, which greatly reduces the AOP of the circuit
However, this configuration also has the disadvantage of causing acoustic artifacts in the output signal

Method used

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  • Microphone system with high acoustic overload point
  • Microphone system with high acoustic overload point
  • Microphone system with high acoustic overload point

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Embodiment Construction

[0024] For the purpose of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiments illustrated in the accompanying drawings and described in the following written description. It should be understood that no limitation of the scope of the present disclosure is intended thereby. It is also to be understood that this disclosure includes any alterations and modifications to the illustrated embodiments, and further applications of the principles of the disclosure as would normally occur to one skilled in the art to which this disclosure pertains.

[0025] Figure 3a A microphone circuit 100 is shown which is advantageously biased with energy saving diodes but also has a high AOP. It should be noted that although circuit 100 is shown and described in single-ended form, in some embodiments circuit 100 is in differential form. Microphone circuit 100 includes microphone 110 connected between node 150 and node 140 . Microphone 110...

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Abstract

The microphone bias circuit includes: a microphone connected between a first node and a first DC bias voltage, the microphone configured to provide a sense voltage at the first node in response to sound; a first diode and a second a pole transistor, a first diode and a second diode connected in antiparallel to each other between a first node and a second node, the second node having a second DC bias voltage; an amplifier having a an input and an output connected to the third node, the amplifier configured to provide an output voltage to the third node based on the sensed voltage at the first node; and a feedback path connected from the third node to the second node. The feedback path includes at least one element configured to couple an AC component of the output voltage at the third node to the second node.

Description

[0001] This application claims the benefit of priority to US Provisional Application Serial No. 62 / 459,813, filed February 16, 2017, the disclosure of which is incorporated herein by reference in its entirety. technical field [0002] The devices disclosed in this document relate to microphone bias circuits, and more specifically, to microphone bias circuits with high acoustic overload points. Background technique [0003] Microphones are transducers that convert sound into electrical signals. Microphones are used in many different applications such as voice recording, telephony, hearing aids, and various sensor systems. Microphones generally operate most accurately within a certain range of sound levels, which depends on the sensitivity and configuration of the microphone. In very loud sound environments, the output signal from the microphone will usually become distorted. In particular, basically any microphone will have an acoustic overload point (AOP), which is the sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R19/005H04R19/04H04R3/02H04R2201/003H04R2410/03
Inventor S.甘塔C.埃泽奎
Owner ROBERT BOSCH GMBH
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