When designing a near-field Bluetooth remote control that operates within 5cm, selecting the right microphone is essential for clear voice capture and effective noise cancellation.
Microphone Directionality Comparison
In close-range applications, the microphone’s directional pattern significantly affects noise rejection performance:
| Feature | Unidirectional Microphone | Bidirectional Microphone |
|---|---|---|
| Pickup Pattern | Front-focused | Front and rear |
| Noise Rejection | Excellent from sides/rear | Good from sides only |
| Close-Talk Performance | Optimal, minimal breath noise | May capture breath/plosives |
| Best For | Remote controls, headsets | Interviews, conversations |
Recommended Solution
For near-field Bluetooth remote controls, we recommend the unidirectional ECM-B1045UML50-25082 electret condenser microphone.
Key Specifications
- Directionality: Uni-directional
- Sensitivity: -50±2 dB
- Max SPL: 125 dB
- Operating Voltage: 1.0–10.0 Vdc
- S/N Ratio: 65 dB
- Current Consumption: 200 μA (Max)
Performance Characteristics
Reliability Features
- Temperature range: -40°C to +80°C
- Vibration resistant (10-55Hz)
- Drop tested (1.0-meter height)
- Humidity resistant (85% RH at 55°C)
Integration Guidelines
Mechanical Requirements
- Hole size: MIC Diameter + 0.05mm
- Hole height: MIC Height – 0.2mm
Soldering Requirements
- Temperature: 360±10℃
- Time: ≤3 seconds
- Static grounding required
Why Unidirectional is Better for Remote Controls
Unidirectional microphones provide superior performance for near-field applications because:
- Better side and rear noise rejection
- Superior handling of close-talk plosive sounds
- Simpler integration in compact designs
- More consistent performance across user positions
Product Information
For detailed specifications and technical support: Bluetooth Remote Control Microphone Solution – Learn More
Conclusion
For near-field Bluetooth remote controls requiring effective noise cancellation, unidirectional electret condenser microphones like the ECM-B1045UML50-25082 offer the best combination of clear voice capture, environmental noise rejection, and reliability in compact designs.
Proper integration following the specified mechanical and soldering guidelines ensures optimal performance for applications operating within 5cm range.
