Sound Producing Devices TRIZ Cases

Segmented adaptive filters in an active noise reduction device prevent coefficient overload while maintaining broadband noise reduction.

A suspended plate inside a hollow member vibrates to absorb acoustic energy at two distinct low frequencies.

A spatial audio apparatus adjusts field orientation based on user position and background noise levels.

A vehicle active noise reduction device uses a signal processor to generate cancelling signals based on user-designated parameter sets received via a communicator.

A sound pressure control device uses nested cylindrical and spiral paths to manage acoustic resonance within a compact volume.

A decoupling ring with a lip design isolates the membrane cup from the housing to reduce vibration transmission.

An acoustically treated landing gear door uses a porous septum layer and drainage system to reduce noise without adding bulk or obscuring servicing placards.

A decoupling unit removes redundant signal components from error paths to prevent over-compensation and improve noise suppression.

Multi-microphone feedforward active noise cancellation captures reference signals from multiple positions to generate a composite anti-noise signal.

A vehicle ultrasonic sensor holding part uses latching elements for secure attachment.

Dynamic biquad filter coefficient adjustment reduces undesirable signal components during ambient audio events, preserving source audio quality.

Phononic crystals beam soundwaves laterally via resonant coupling, bypassing waveguide cutoff limits and minimizing amplitude loss.

An active adaptive system generates inverted signals to cancel environmental disturbances from medical equipment.

Dynamic seat occupancy data refines the acoustic algorithm, resolving the trade-off between prediction accuracy and computational complexity.

Reflex bends in the horn walls extend sound paths radially, achieving required volume and distribution without increasing vertical dimensions.

Replacing bulky mechanical springs with a miniaturized MEMS structure, this device generates high-fidelity reverberation while minimizing thermoviscous losses.

A planar loudspeaker manifold channels sound through reflective surfaces to expand beamwidth.

Specific polyol blends eliminate filler-induced defects while maintaining structural integrity for superior sound absorption.

Spiral acoustic tube generates evanescent waves through segmented sound speed control, reducing speaker array complexity and signal processing load.

A calibration method subtracts recorded background noise from initial audio signals to derive a compensation factor for accurate sound output.

An elimination filter coefficient generation method modifies reference signals to match speaker capabilities.