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Distributed automatic level control for microphone array

A level control, microphone technology, applied in amplification control, gain control, digital/encoded signal control, etc., can solve problems such as reducing PGA gain

Active Publication Date: 2015-11-18
INVENSENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the input signal level becomes higher than the target level, the ALC will reduce the gain of the PGA at a rate known as the attack time

Method used

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  • Distributed automatic level control for microphone array
  • Distributed automatic level control for microphone array
  • Distributed automatic level control for microphone array

Examples

Experimental program
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Embodiment Construction

[0040] In an embodiment of the invention, automatic level control (ALC) is performed in a decentralized manner by a plurality of microphone devices in a microphone array, wherein each microphone device performs the ALC function based on a common automatic level control parameter, the common automatic level control The parameters are generated by each microphone arrangement based on aggregated data from the plurality of microphone arrangements. For example, aggregated data may include raw microphone data from all microphone devices, maximum or minimum peak or RMS values ​​calculated by microphone devices, average signal level values, gain values, or other automatic level control parameters.

[0041] In some prior art systems, each microphone device sends raw microphone data to a master device, which processes the raw data to perform ALC on the microphone data samples. Figure 3 is a schematic block diagram illustrating one example of a microphone array, each sending raw micropho...

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Abstract

A distributed automatic level control function is provided, in which information relating to a common automatic level control parameter is transmitted to each of a plurality of microphone devices, wherein the information transmitted to at least one microphone device is derived from an audio sample of at least one different microphone device. Each microphone device produces the common automatic level control parameter based on the information received by the microphone device and applies the common automatic level control parameter produced by the microphone device to a distributed automatic level controller of the microphone device.

Description

[0001] Cross References to Related Applications [0002] The subject matter of this patent application may be related to that of commonly-owned U.S. Patent Application No. XXXXXX (Attorney Docket No. 2550 / E13), entitled "ADVANCEDTDMDAISY-CHAINCOMMUNICATIONSYSTEMSANDDEVICES," filed on the same date herewith. subject matter. [0003] The subject matter of this patent application may also relate to a patent application entitled "SYNCHRONIZATION, RE-SYNCHRONIZATION, ADDRESSING, ANDSERIALIZED SIGNAL PROCESSING FOR DAISY-CHAINED COMMUNICATION DEVICES" filed on March 22, 2012. )" which asserts the subject-matter of co-owned U.S. Patent Application No. 13 / 426,918 (Attorney Docket No. 2550 / D82), which asserts rights and interests. [0004] The subject matter of this patent application is also related to Ser. No. 13 / 071,836, entitled "SYSTEM, APPARATUS, ANDMETHODFORTIME-DIVISIONMULTIPLEXEDCOMMUNICATION," filed March 25, 2011 Co-owned US Patent Application (Attorney Docket No. 2550 / D35)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H1/00H03G3/20H04L12/66
CPCH04R3/005H04R2430/01H03G3/3005H03G3/002H04R3/002H04R29/006H04R2201/003
Inventor 严东勤傅杰潘扬
Owner INVENSENSE