CSR BC7810 TwoMicHandsetDesignGuidelines

CSR2005

There is significant flexibility and variance in the design of mobile phones. From the physical look to the
component layout, to the overall cost, there are several design variables to consider before finalising a mobile
handset product. This design variance can greatly affect the audio characteristics of the mobile phone and
consequently affect the performance of the NS and AEC algorithms. The purpose of this document is to provide
guidelines for designing mobile handsets for optimal use with the current two microphone NS and AEC
algorithms included in CVC-HS-5-3-1.
Contents
1 Introduction ................................................................................................................................................... 4
2 Guidelines...................................................................................................................................................... 5
2.1 Microphone Spacing............................................................................................................................... 5
2.2 Microphone Type.................................................................................................................................... 5
2.3 Minimise the Primary Microphone to Mouth Distance.............................................................................. 5
2.4 Microphone Position ............................................................................................................................... 5
2.4.1 Flip Style Phone Primary Microphone Position ............................................................................ 6
2.4.2 Candy Bar Style Phone Primary Microphone Position ................................................................. 6
2.4.3 Slider Style Phone Primary Microphone Position ......................................................................... 7
2.4.4 Secondary Microphone Position................................................................................................... 8
2.4.5 Slider Style Phone Secondary Microphone Position .................................................................... 8
2.5 Similar Microphones ............................................................................................................................... 9
2.6 Distortion ................................................................................................................................................ 9
2.7 Minimise acoustic coupling ...................................................................................................................... 9
2.7.1 Acoustic Coupling between Secondary Microphone and Speakerphone Mode Loudspeaker ... 10
2.8 Minimise Vibration and Wind Noise ....................................................................................................... 10
2.9 Differentially Wire Microphones ............................................................................................................. 10
3 Example Designs ........................................................................................................................................ 11
3.1 Centre Mounted Flip Phone Example Design........................................................................................ 11
3.2 Off-Centre Mounted Flip Phone Example Design.................................................................................. 12
3.3 Example Microphones ...........................................................................................................................
【文件名】:10811@52RD_CS-127034-ANP4_TwoMicHandsetDesignGuidelines.pdf
【格　式】:pdf
【大　小】:949K
【简　介】:
【目　录】: