CSR8670官方指导双MIC降噪设计指南_杰理语音降噪算法

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Qualcomm Technologies International, Ltd.

Confidential and Proprietary – Qualcomm Technologies International, Ltd.

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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.

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Qualcomm® cVc™

Two Microphone Handsfree

Design Guidelines

CS-225939-AN Rev.4

September 26, 2016

CS-225939-AN Rev. 4 Confidential and Proprietary – Qualcomm Technologies International, Ltd. 3

MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION

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