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1、 CS-121967-UGP1 Cambridge Silicon Radio Limited 2008 This material is subject to CSRs non-disclosure agreement. CSR Cambridge Science Park Milton Road Cambridge CB4 0WH United Kingdom Registered in England 3665875 Tel: +44 (0)1223 692000 Fax: +44 (0)1223 692001 =s=s= cVc 1 mic Headset Tuning Guide
2、Product Code: BCSW-CVC-HS-4-3-1 Issue 1 Contents CS-121967-UGP1 Cambridge Silicon Radio Limited 2008 This material is subject to CSRs non-disclosure agreement. Page 2 of 33 =s=s= =s=ep=eJN=q=d=s=ep=eJN=q=d= Contents 1 Introduction4 1.1 General4 1.2 Before You Begin 4 2 Prerequisites5 2.1 Parameter M
3、anager Tool and User Guide.5 2.2 SPI Communication Protocol Drivers 7 2.3 Hardware Interfaces 7 3 Tuning Overview8 4 Tuning Preparation9 4.1 Before You Begin 9 4.2 Headsets .9 4.3 Phones and Networks .9 4.4 Tuning Environment 10 4.5 Level Speech Phrase 10 5 Instrumentation11 5.1 SPL Meter11 5.2 Head
4、 and Torso Simulator.11 6 Tuning Procedures 12 6.1 Objective Measurement.12 6.2 Receive Path Tuning .12 6.2.1 Load Preset Parameters 12 6.2.2 Receive AGC .13 6.2.3 SPKR Gain.13 6.2.4 Noise Dependent Volume Control14 6.3 Send Path Tuning15 6.3.1 MIC Gain15 6.3.2 Send AGC16 6.3.3 Noise Suppression.16
5、6.3.4 Comfort Noise17 7 Fine Tuning.18 7.1 Receive Path.18 7.1.1 Receive AGC .18 7.1.2 Setting Minimum Loudness19 7.1.3 Receive EQ19 7.1.4 Clipper19 7.1.5 Side Tone.20 7.1.6 Lost Packet Concealment 20 7.2 Send Path20 7.2.1 MIC Gain in NS Mode20 7.2.2 Acoustic Echo Canceller 20 7.2.3 Send EQ 21 7.2.4
6、 Send AGC22 7.2.5 Noise Suppression.22 8 Tuning Preparation Checklist .23 9 Tuning Flowcharts.24 9.1 cVc HS Tuning Overview.24 9.2 SPKR Gain25 9.3 MIC Gain .26 9.4 NDVC, Part 1 of 227 9.5 NDVC, Part 2 of 228 Contents CS-121967-UGP1 Cambridge Silicon Radio Limited 2008 This material is subject to CSR
7、s non-disclosure agreement. Page 3 of 33 =s=s= =s=ep=eJN=q=d=s=ep=eJN=q=d= 9.6 Noise Suppression 29 9.7 Comfort Noise30 List of Figures Figure 2.1: Accessing Headset Parameter Manager from UFE 5 Figure 2.2 Parameter Manager Window (Wide Band Example)6 Figure 2.3 CSR SDK software Setup Window with Dr
8、iver Installation Option Selected7 Figure 3.1: Processing Blocks on the Parameter Manager Window .8 Figure 3.2: The Five cVc HS Tuning Stages.8 Figure 4.1: A Recorded Waveform of the English Phrase “one two three four five”10 Figure 6.1: Receive Path Processing Blocks 12 Figure 6.2: Send Path Proces
9、sing Block Diagram 15 Figure 7.1: Low Volume Mode Threshold Operation.21 List of Tables Table 5.1: Recommended Meter Settings.11 Introduction CS-121967-UGP1 Cambridge Silicon Radio Limited 2008 This material is subject to CSRs non-disclosure agreement. Page 4 of 33 =s=s= =s=ep=eJN=q=d=s=ep=eJN=q=d=
10、1 Introduction This document is designed for audio developers and describes how to tune clear Voice capture (s ) 1 mic Headset (HS) audio processing software running on BlueCore-Multimedia Integrated Circuits (IC). A Windows PC-based configuration tool (Parameter Manager) that communicates with CSRs
11、 Bluecore IC, simplifies the tuning process. This tool monitors audio signal statistics and can be used to adjust cVc HS audio processing block parameters to achieve optimal audio performance. 1.1 General cVc software is a sophisticated application that allows users to compensate for environmental a
12、nd acoustic variables to improve a headsets call sound quality. The cVc software tuning procedure is completed by a series of acoustic/electro-acoustic tests and measurements performed in a specific sequence. The test results are used to modify cVc software audio processing parameters. The main purp
13、ose of the cVc software tuning procedure is to achieve an optimum level of headset sound quality. The cVc tuning process can be carried out at several points during the headsets development cycle. Initial tuning can begin when a prototype that packages audio, power, communication and processing comp
14、onents is available. Final tuning to verify optimal performance should be completed when the final production components and plastics are available. The default parameters of the shipped version of the software are selected to provide adequate performance over a wide range of hardware variables. To
15、provide the optimal performance for a specific design, the parameters for each cVc processing block may need to be tweaked. 1.2 Before You Begin CSR recommends that product developers familiarise themselves with the principles of acoustic performance and the tuneable parameters supported by the Parameter Manager tool. Section 9 provides flowcharts to help speed up the familiarisation process. Prerequisites CS-121967-UGP1 Cambridge Silicon Radio Limited 2008 This material is subject to CSR
