Evaluate Tonal Noise Suitability
Not every noise source is suitable for active noise control. Dominant narrowband tonal components are strong candidates, while broadband or highly stochastic noise is typically not. This technical guideline outlines how to determine whether a noise source exhibits tonal characteristics suitable for ANC evaluation.
Industrial Applications
Tonal compressor and fan noise often dominates regulatory evaluation in residential and commercial thermal systems. Passive damping increases size and airflow resistance, while tonal penalties remain difficult to mitigate.
Hummble ANC systems target narrowband tonal peaks directly at the source, without modifying airflow paths or increasing enclosure volume.
Typical challenges
Dominant compressor harmonics
Tonal penalties under local regulations
Space-constrained outdoor units
High-density residential deployment
How Hummble ANC is applied
ANC Compact integrated into enclosure
Dual-microphone adaptive configuration
Real-time tonal detection and suppression
Optional Autotuning for production variability
Outcome
Reduced tonal prominence
Restored compliance margin
No mechanical redesign required
Confined spaces and reflective surfaces in marine environments amplify tonal components from propulsion systems, HVAC, and auxiliary equipment. Structural transmission further complicates passive mitigation strategies.
Hummble systems enable targeted suppression of dominant frequencies without increasing system mass or interfering with vessel operation.
Typical challenges
Engine and auxiliary equipment tonal noise
Cabin noise amplification in enclosed compartments
Limited installation space
Vibration-induced acoustic coupling
How Hummble ANC is applied
ANC Modular architecture for distributed integration
Vibration sensor reference input (optional)
Multi-channel microphone configurations
Custom actuator placement
Outcome
Reduced tonal dominance in confined spaces
Improved onboard acoustic comfort
Minimal structural modification
High-speed fans generate strong blade-pass and harmonic tones that are difficult to mitigate using passive absorptive materials—especially in compact industrial or precision environments.
Hummble actively suppresses narrowband tonal components while preserving airflow performance.
Typical challenges
Blade-pass frequency peaks
Harmonic amplification in ducts
Noise affecting measurement accuracy
Limited acoustic treatment space
How Hummble ANC is applied
Development kit validation for tonal mapping
Modular actuator integration
Adaptive narrowband control
Production-ready customized module
Outcome
Targeted tonal suppression
No airflow compromise
Scalable integration path
