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Vesper - Confidential

Overview:

Validation & Self-Test

This guide will help to validate the performance of

your TWS prototype.

•

Part 1: Hardware Check.

Using BIST to check

integrity of VA1210 MEMS & wire connections

•

Part 2: Wearing the TWS

. Wear the TWS

properly to ensure the best signal.

•

Part 3: Signal Quality Check.

Measuring SNR

and Noise Floor.

•

Part 4: Setting Up Hardware VAD

. Using the

VA1210 as an ultra-low-power Hardware VAD.

Validated TWS prototype

Hardware Check

Wearing the TWS

Signal Quality Check

Setting Up Hardware VAD

Содержание VA1210

Страница 1: ...VA1210 Validation Self Test Guide Rev 7 ...

Страница 2: ...Vesper Confidential 2 List of Contents Page Contents 3 Overview 4 Hardware Check 7 Wearing the TWS 8 10 Signal Quality Check 11 12 Setting up Hardware VAD Voice Activity Detect ...

Страница 3: ... check integrity of VA1210 MEMS wire connections Part 2 Wearing the TWS Wear the TWS properly to ensure the best signal Part 3 Signal Quality Check Measuring SNR and Noise Floor Part 4 Setting Up Hardware VAD Using the VA1210 as an ultra low power Hardware VAD Validated TWS prototype Hardware Check Wearing the TWS Signal Quality Check Setting Up Hardware VAD ...

Страница 4: ...d its analog connections e g to the ADC BIST allows you to test the VA1210 in mass production without using expensive test equipment such as a shaker BIST involves two tests In the next slide we will explain how to perform these tests reserved reserved reserved reserved reserved reserved BIST_POL BIST_EN I2C Register 0x6 time BIST Test Sequence 1ms ...

Страница 5: ...easure size of square wave at output OUT OUTP OUTM To perform BIST Test 1 set MODE pin low write 0x3 to Register 0x6 BIST_POL 1 BIST_EN 1 Measure size of square wave at output OUT OUTP OUTM To exit BIST mode write 0x0 to Register 0x6 BIST_POL 0 BIST_EN 0 Next we will explain how to interpret the BIST result time reserved reserved reserved reserved reserved reserved BIST_POL BIST_EN BIST Test Seque...

Страница 6: ...ST Test 1 Interpretation Small square wave OUT 50mVpp Large square wave OUT 50mVpp System is healthy Small square wave OUT 50mVpp Small square wave OUT 50mVpp VA1210 PCB wiring or ADC is damaged Large square wave OUT 50mVpp Large square wave OUT 50mVpp VA1210 is damaged Large square wave OUT 50mVpp Small square wave OUT 50mVpp VA1210 is damaged 50mVpp threshold may change in the production version...

Страница 7: ...eartip If the TWS mockup has cables follow these steps 1 Make sure that there is slack in the cables Cables connected to TWS should be loose not pulling tight Use tape to secure cable and reduce tension This also reduces cable fluttering during wind testing 2 Place the interface board near the wearer The interface board connected to the TWS with cables should not be too far It could be on a nearby...

Страница 8: ... reciting Harvard Sentences 2 Bandpass both recordings with a bandpass filter 120Hz 2kHz 30dB octave 3 Compute the following a Compute RMS of Silence Recording Noise RMSnoise b Compute RMS of Speech Recording Total Noise Speech RMStotal c Calculate Voice RMS from previous two results RMSvoice sqrt RMStotal 2 RMSnoise 2 d Calculate SNR in dB SNRdB 20 log10 RMSvoice RMSnoise In a good TWS mockup wit...

Страница 9: ...red silenceStart Fs silenceEnd Fs RMStotal rms audio_filtered speechStart Fs speechEnd Fs RMSvoice sqrt RMStotal 2 RMSnoise 2 SNRva1200 20 log10 RMSvoice RMSnoise Signal Quality Check Part 2 3 Example MATLAB code Compute RMS of Silence Recording Noise RMSnoise Calculate Voice RMS from previous two results RMSvoice sqrt RMStotal 2 RMSnoise 2 Calculate SNR in dB SNRdB 20 log10 RMSvoice RMSnoise Comp...

Страница 10: ...lean noise floor see blue curve looks like a 1 f slope with a 30dB resonant peak at 4 5kHz If there is RF interference it can look like sharp peaks on the noise floor see red curve at 5 6kHz Bluetooth interference can be identified by the noise frequency The peaks are usually multiples of 133Hz i e 133Hz 266Hz 400Hz Clean VA1210 noise recording VA1210 noise recording with RF interference ...

Страница 11: ...not produce output at 4 5kHz Setting up Hardware VAD Part 1 2 Overview You can use the VA1210 as an ultra low power hardware VAD by setting the MODE pin high The VA1210 will enter Zero Power Listening ZPL mode where supply current is only 10uA In ZPL mode OUTP and OUTM are disabled and the DOUT pin will latch high when the VA1210 detects that the wearer is speaking DOUT can be reset low by lowerin...

Страница 12: ...Gain Read Only Ambient Acceleration Readout is disabled PGA MIN PGA MAX 0x2 WOS Filter 0x0 ZPL band pass filter is 200Hz 1kHz 0x3 WOS PGA MIN THR 0x1B Feedback loop is locked to 0 013G PGA MIN PGA MAX 0x1B 0x4 WOS PGA MAX THR 0x1B 0x5 WOS Threshold 0x0 Threshold is just above 0 013G 0x6 BIST Control 0x0 Built In Self Test is disabled Default ZPL configuration is optimized for Voice Activity Detect...

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