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.

Removing internal septa from a honeycomb core reduces weight and cost while maintaining acoustic performance through air flow channels.

Asymmetric rigid platelets on an elastic membrane induce tunable resonant modes to absorb low-frequency sound waves that linear materials dissipate poorly.

Adjusting the adaptive active noise cancellation duty cycle based on filter parameter differences reduces power consumption and memory usage.

Learning apparatus trains an estimation model using biological inputs and exercise indices to recommend music that temporarily enhances physical performance.

Varying fin curvature radii refract sound waves horizontally, expanding the listening area without increasing speaker system volume.

Segmented unit cells form a wide acoustic bandgap to attenuate low-frequency noise without increasing device volume or sacrificing durability.

A digital microbeamformer uses a distributed mesh architecture to perform local signal processing on digitized sensor elements.

A membrane-like member absorbs sound energy through vibration in a compact structure.

Pre-calculated gain coefficients reduce computational complexity while maintaining realistic audio experience.

Sending terminal compares transmitted audio with received playing audio to verify playback status.

A decoupling unit removes redundant signal components from stacked paths, preventing audio wave superposition interference that degrades playback quality.

A noise reduction device uses specific microphone and speaker distances to generate anti-phase sound for active noise cancellation.

Active noise control system modifies error signals based on detected occupant positions to generate customized anti-noise for vehicle cabins.

Hydrothermal crystallization forms uniform sound-absorbing particles on porous ceramic substrates.

Segmenting resonating layers into identical unit cells reduces manufacturing complexity while coupling internal modes to achieve broadband noise attenuation.

Position-based coefficient updates stabilize active noise suppression during rapid acoustic changes, preventing instability in moving vehicles.

A parallel estimation unit tracks secondary path variations in real-time, maintaining stability and cancellation efficiency across dynamic environments.

A frequency-warping filter circuit uses first-order all-pass units to generate noise-canceling signals without high-order filters.

Adjustable mast length places sonar in favorable acoustic layers to reduce bottom reverberation and extend detection range.

Injecting shaped noise into cabin audio enables adaptive secondary path convergence during low-volume playback without generating perceivable disturbance.

Segmenting frequency subbands for independent machine learning processing removes acoustic feedback while maintaining speech intelligibility.

Piezoelectric transducers generate anti-vibration signals to counteract speaker noise, enabling higher stable gain without microphone distortion.

Periodic reference recalibration corrects accumulated rounding errors in adaptive noise cancellation systems.

A heavy porous soundproofing layer combines entangled fibers with polymeric particles and a hot-melt binder to create a cohesive, adjustable-density material.

A transducer mounting device uses a rotation-based axial adjustment mechanism to position sensor organs within vehicle bumper assemblies.

A planar lens uses segmented acoustic structures to focus ultrasound waves at multiple distinct positions simultaneously.

A thermoplastic elastomer cap surrounds the ultrasonic sensor and mounting bracket to provide secure mechanical attachment.

Positioning drivers at modal function nodes eliminates undesirable frequency peaks and dips, resolving trade-offs between output power and response uniformity.