V2S200D Evaluation Kit –
Quick Start Guide
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TWS Demo: evaluation software for wireless TWS and OWS headsets
Sensing speech vibration via direct contact when user is talking. Sound isolation from loud external signals: wind, traffic noise, chatter.
Use in applications with imperfect body contact (ex.: TWS rubber eartip). Speech pickup via V2S vibration sensor limited to lower
frequency range
DISCLAIMER
The information given in this document shall in no event be regarded as a guarantee of conditions
or characteristics. With respect to any examples given herein, any typical values stated herein
and/or any information regarding the application of the device, Knowles Electronics, LLC hereby
disclaims any and all warranties and liabilities of any kind, including without limitation warranties of
non-infringement of intellectual property rights of any third party.
INFORMATION
For further information on technology, delivery terms and conditions and prices,
please contact a Knowles representative.
© 2024, Knowles Electronics, LLC, Itasca, IL USA. All Rights Reserved.
Knowles and the logo are trademarks of Knowles Electronics, LLC.
Screen 1: Recording
Screen 2: Data analysis
Requirements:
In order to run V2S software tool installation of Matlab Runtime
2023b or later is required
Recording:
1. Connect evaluation kit hardware
2. Use TWS prototype included in the kit with V2S sensor and
microphone integrated. Alternatively, use wired assembly:
V2S sensor and microphone on wires
3. Start the GUI software
4. Select input device. Knowles evaluation kit shows up on PC
as KN BPs USB Audio Class
5. Select output device for sound playback
6. Select recording duration. Above 30 sec is not
recommended
7. V2S only LPF setting controls low-pass filter cutoff
frequency for V2S channel listening on the next screen
8. Blend setting controls frequency for mixing V2S data in low
range with microphone data in high range on next screen
9. Hit Record button. Button turns red during recording
10. Allow 0.5sec for noise-suppression algorithm to adopt
11. Start speaking. Wind noise test recommended to observe
V2S advantage
12. When recording is completed, raw data is displayed on
time-domain chart and spectrogram is shown. No post-
processing is applied to data on this screen
13. Play Mic and Play V2S buttons can be used to hear
recorded data. Note: no gain is applied at this step, expect
very soft playback
14. Press Process to go to the next screen
Listening and data analysis:
1. 4 options with different post-processing are displayed. Each
includes time-domain view and frequency domain-view
•Microphone data for reference
•V2S Low Pass filter. Data is scaled for comfortable
listening. Low pass filter applied from the setting on
recording screen
•V2S Low Pass filter with noise supression. Basic noise
suppression algorithm is applied to the data from previous
step. Uses initial 0.5sec of the recording to establish noise
mask.
•V2S LPF + Mic HPF. Low-frequency V2S data is mixed
with high-frequency mic data according to Blend setting
from previous screen
2. Press Play button to hear the data with corresponding
processing. Note: gain is applied, please use caution when
listening in headphones to avoid hearing damage
3. Press Export button to save recorded and processed files
on your PC. File location will match with folder where GUI
software is installed
4. Press Return to go back to the recording screen
