Consumer Voice Activation Solution

Application

Description

Complete voice activation solution for smart home devices featuring Memsensing high-performance MEMS microphones with low self-noise and high SNR for reliable far-field voice recognition.

Core Advantages

High SNR for Far-Field Pickup 64dB SNR enables reliable voice recognition from 3-5 meters distance, essential for smart speaker applications.
Low Self-Noise Performance 29dB self-noise floor ensures clear audio capture even in quiet environments, improving recognition accuracy.
Compact Form Factor 3.76mm × 2.95mm × 1.10mm package enables integration in space-constrained consumer devices.
Cost-Effective Solution Offers performance comparable to leading brands at competitive pricing, reducing BOM cost for high-volume consumer products.

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 MSM-261S4030H0R Digital MEMS Microphone, Top Port, -26dB 4 📄 Download
2 DSP/Codec Audio DSP with PDM input and beamforming (Customer Supplied) 1 📄 Download
3 0.1µF Decoupling Capacitor for Microphones 4 📄 Download
4 10kΩ Pull-down Resistor for L/R Select 4 📄 Download

Applications

Smart speakers and voice assistants
Smart home control panels
Voice-controlled appliances
Wearable voice devices
Automotive voice control
Security systems with voice recognition

Technical Specifications

Sensitivity
-26 dBFS (typical)
S N R
64 dB(A)
Self- Noise
29 dB(A)
Frequency Response
100Hz - 10kHz
Output Interface
Digital PDM
Supply Voltage
1.64 - 3.6V
Current Consumption
650µA (normal mode), 160µA (low power)
Operating Temperature
-40°C to +85°C

Customer Success Stories

Smart Home Device Manufacturer

Consumer Electronics | Smart Speaker Voice Control

Challenge

A smart home device manufacturer needed high-performance microphones for their new smart speaker line. The microphones needed to support far-field voice recognition from 3-5 meters, work in noisy environments, and maintain low cost for competitive pricing. Existing solutions were either too expensive or lacked the SNR performance needed for reliable wake-word detection.

Solution

BeiLuo recommended the MSM-261S4030H0R microphone array with 4 microphones in circular configuration. Our FAE team provided guidance on microphone placement, acoustic cavity design, and DSP integration for beamforming. We also provided reference designs for the microphone array PCB layout.

Results

The smart speaker achieved 95%+ wake-word recognition accuracy at 3 meters distance, even with background music playing. The microphone solution cost 40% less than competing options, enabling competitive product pricing. The product successfully launched and has sold over 100,000 units with excellent customer reviews on voice recognition performance.

FAE Expert Insights

J

Jennifer Wang

Senior FAE - Audio Systems

10 years

Professional Insights

The MSM-261S series microphones are excellent for voice activation applications. The 64dB SNR provides reliable far-field pickup, and the compact size fits most consumer device form factors.

Key Takeaways

  • Use 3-4 microphones in array for far-field pickup
  • Maintain 30-40mm spacing for circular arrays
  • Keep microphone traces matched within 1mm
  • Ensure clear acoustic path from port to exterior
  • Separate microphones from speakers by at least 10cm

Decision Framework

Voice Activation System Design Framework
Steps:
  1. Define pickup range and pattern requirements
  2. Select microphone count and array configuration
  3. Design acoustic cavity and PCB layout
  4. Integrate with DSP and implement beamforming
  5. Tune and test voice recognition performance

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Contact Us Now

Frequently Asked Questions

How many microphones do I need for far-field voice recognition?

For far-field voice recognition (3-5 meters), a minimum of 3-4 microphones in an array is recommended. Single microphones can work for near-field (0.5-1m), but microphone arrays enable beamforming which significantly improves far-field performance. The array configuration depends on your pickup pattern needs: 2 microphones for linear/directional, 3-4 for 360-degree coverage, 6+ for advanced beamforming. The MSM-261S microphones work well in arrays - their sensitivity matching is typically within ±1dB which is sufficient for beamforming.

Use 3-4 microphones for 360-degree far-field coverage. More microphones improve performance but increase cost and complexity.

What is the optimal spacing for microphone arrays?

Optimal microphone spacing depends on the application: For circular arrays (360-degree coverage), 30-40mm spacing works well for voice frequencies. For linear arrays (directional), 20-30mm spacing is typical. The spacing affects the beam pattern and frequency response - closer spacing provides wider beam coverage but less directionality at high frequencies. For voice applications (100Hz-8kHz), 30-40mm is a good compromise. The key is to keep all microphones at the same distance from the sound source when possible, and match PCB trace lengths to within 1mm for proper time alignment.

30-40mm spacing for circular arrays, 20-30mm for linear arrays. Match trace lengths within 1mm.