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CSR8670 官方指导双MIC降噪设计指南.pdf

发布时间：2022-05-30 发布人：admin 分类：说明书 资料大小：0.43M 资料格式：pdf 举报 版权申诉
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    1 Introduction
    2 cVc 2-mic Handsfree system
    2.1 Uni-directional microphones
    2.1.1 Beamforming of directional microphones facing side-to-side
    2.2 Omni-directional microphones
    3 Example design
    3.1 Microphone specification
    3.2 Microphone positioning
    3.3 cVc details
    Document references
    Terms and definitions
    Qualcomm Technologies International, Ltd. Qualcomm® cVc™ Two Microphone Handsfree Design Guidelines CS-225939-AN Rev.4 September 26, 2016 Confidential and Proprietary – Qualcomm Technologies International, Ltd. NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: DocCtrlAgent@qualcomm.com. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm Technologies International, Ltd. or its affiliated companies without the express approval of Qualcomm Configuration Management. Not to be used, copied, reproduced, or modified in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Technologies International, Ltd. Qualcomm BlueCore and Qualcomm cVc are products of Qualcomm Technologies International, Ltd. Other Qualcomm products referenced herein are products of Qualcomm Technologies International, Ltd. or Qualcomm Technologies, Inc. or its other subsidiaries. Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries. BlueCore and cVc are trademarks of Qualcomm Technologies International, Ltd., registered in the United States and other countries. Other product and brand names may be trademarks or registered trademarks of their respective owners. This technical data may be subject to U.S. and international export, re-export, or transfer (“export”) laws. Diversion contrary to U.S. and international law is strictly prohibited. Qualcomm Technologies International, Ltd. (formerly known as Cambridge Silicon Radio Limited) is a company registered in England and Wales with a registered office at: Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom. Registered Number: 3665875 | VAT number: GB787433096. © 2014-2016 Qualcomm Technologies International, Ltd. All rights reserved.
    Revision history Revision 1 2 3 4 Date 20 FEB14 12 MAY 14 20 MAY 14 26 SEP 16 Description Original publication of this document Editorial updates Editorial updates Updated to reflect QTIL rebranding CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 2
    Contents 1 Introduction ........................................................................................................................... 4 2 cVc 2-mic Handsfree system ................................................................................................ 5 2.1 Uni-directional microphones ...................................................................................................................... 7 2.1.1 Beamforming of directional microphones facing side-to-side.................................................... 7 2.2 Omni-directional microphones ................................................................................................................... 9 3 Example design ....................................................................................................................11 3.1 Microphone specification ......................................................................................................................... 11 3.2 Microphone positioning ............................................................................................................................ 11 3.3 cVc details ............................................................................................................................................... 12 Document references .............................................................................................................13 Terms and definitions .............................................................................................................14 Figures Figure 2.1: 2-mic Handsfree system .............................................................................................................................. 5 Figure 2.2: Typical In-car noise environment ................................................................................................................. 6 Figure 2.3: 2-mic configurations overview ...................................................................................................................... 7 Figure 2.4: Beamforming of directional microphones facing side-to-side ....................................................................... 8 Figure 2.5: Beam pattern of directional microphones facing side-to-side ....................................................................... 8 Figure 2.6: Beamforming of omni-directional microphones ............................................................................................ 9 Figure 2.7: Beam pattern of omni-directional microphones .......................................................................................... 10 Tables Table 3-1 Example microphone specification ............................................................................................................... 11 Table 3-2 Example microphone positioning ................................................................................................................. 11 Table 3-3 cVc details .................................................................................................................................................... 12 CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 3
    1 Introduction This document describes how to effectively design a two microphone (2-mic) CVC Handsfree system. Topics include microphone spacing, orientation, directionality and placement in the hands-free car environment. These recommendations apply to version BCSW-CVC-HF-5-0-x only. Qualcomm Technologies International, Ltd. (QTIL) recommends that you follow these design guidelines to ensure that the 2-mic automotive cVc algorithm works effectively. CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 4
    2 cVc 2-mic Handsfree system The modules in the cVc algorithm that impact the functional quality of the 2-mic Handsfree system are: ■ Beamforming ■ ADF ■ OMS ■ AED Figure 2.1: 2-mic Handsfree system The cVc 2-mic Handsfree system enables you to select either omni-directional or uni-directional microphones. Microphone types include: ■ Analogue electrets ■ MEMS digital ■ MEMS silicon analogue cVc does not support a mix of microphone types. Currently, the processing does not support more than two microphones. CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 5
    Two Microphone Handsfree Design Guidelines cVc 2-mic Handsfree system Defrost Noise Road Noise Traffic Noise Window Noise Road Noise Traffic Noise Driver’s Speech Passenger’s Speech Figure 2.2: Typical In-car noise environment Figure 2.3 shows array configurations and spacing for microphones with different directionality, and their corresponding beam patterns. Courtesy Light refers to the lamp assembly inside the car. CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 6
    Two Microphone Handsfree Design Guidelines cVc 2-mic Handsfree system 2-Mic Array Installation Configurations 2-Mic Array Configurations 2-Mic Array Beampatterns Microphone Beampatterns Beamforming Beampattern Courtesy Light 2 Omnidirectional Microphones Microphone Spacing 4.8 cm (+6 / -2 cm) 2-Mic Array Microphone Spacing 2 Unidirectional Microphones (facing side-to-side) Microphone Spacing 4.8 cm (+6 / -2 cm) Figure 2.3: 2-mic configurations overview The cVc Handsfree system recommended microphone placement position is on the interior ceiling at the windshield, centered between the driver and passenger, either in: ■ The rear view mirror ■ The overhead lamp assembly The microphones should be forward of the driver with a microphone-to-mouth distance of up to 60 cm. The cVc Handsfree system does not support microphone placement in the Vehicle A-pillars. For any position other than the recommended position, consult with QTIL for guidance. 2.1 Uni-directional microphones This section describes QTIL's recommendations for uni-directional microphone placement. 2.1.1 Beamforming of directional microphones facing side-to-side In this configuration, the cVc Handsfree system contains: ■ Beamforming ■ ADF ■ OMS ■ AED CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 7
    Two Microphone Handsfree Design Guidelines cVc 2-mic Handsfree system Figure 2.4: Beamforming of directional microphones facing side-to-side Figure 2.5: Beam pattern of directional microphones facing side-to-side CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION 8
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