Sound Producing Devices TRIZ Cases

Dual error microphones calculate an acoustic intensity vector to adjust adaptive noise cancellation algorithms.

An active vibratory noise reduction system uses an adaptive stabilization coefficient updating unit to generate control signals.

A noise canceling device predicts acoustic wave amplitude using propeller RPM and location data to generate anti-phase sound waves.

Curved diffraction surfaces in a sonar horn increase sensitivity by 12 decibels while expanding transverse beam width without reducing radiated power.

Superposing multiple wave-beams with different divergences creates a combined beam with constant lateral extent for interrogation.

A programmable incident-energy shaper uses an actuated deformable layer to flex and steer optical or acoustic waves.

Segmented reference sensor selection uses coherence and Fisher Information Matrix to balance calculation time with control performance reliability.

Networked speaker assemblies use upwardly oriented transducers to project sound inward while generating anti-phase signals for active noise cancellation.

A high tortuosity porous foam layer absorbs acoustic energy at medium and high frequencies within a stacked soundproofing assembly.

Non-uniform spacing in a linear array distributes peak dynamic pressure uniformly, reducing cavitation depth without increasing device complexity.

A wearable sound device uses a dynamic venting mechanism to manage acoustic isolation.

Dynamic noise compensation adjusts actuator phase based on seat sensor data, maintaining effective attenuation despite driver movement.

Tilt mechanism lifts sonar head parallel to deck, enabling repeatable alignment without recalibration during trailering.

A belt-mounted signaling device uses a transducer and bells to convert pawing into electromagnetic alerts.

A coherent near-field array uses distributed elements to generate interference patterns for high power density peaks.

A control device cancels external noise in autonomous vehicle cabins by broadcasting opposing sound signals through internal loudspeakers.

An acoustic management module coordinates control parameters between multiple audio processing modules to ensure mutually compatible operation.

A horn body with a quartic curve sound path flares to increase inner surface area for mid to high frequency output.

Vertically asymmetric acoustical horn redirects spherical waves to minimize distortion while maintaining directivity across different transducers.

A programmable elastic metasurface steers flexural waves in real time using integrated piezoelectric actuators and sensors.

Asymmetric rigid plates on an elastic membrane establish predetermined mass cells that absorb low-frequency sound waves through tuned resonant modes.

An active noise control system uses adaptive and auxiliary filters to cancel multiple noises at various positions.

A micromachined ultrasonic transducer package uses a curved back cavity to control acoustic resonant modes.

Shift register arrays and a delay controller process return-wave signals to resolve channel compatibility issues in ultrasound beam formers.

Dual speaker arrays generate inverted phase signals to cancel sound fields, resolving the bottleneck of controlling silenced areas in the depth direction.

A noise cancellation apparatus captures undesirable signals and generates inverse phase signals to neutralize ambient acoustic interference.

Curved horn throat surfaces correct sound-wave path lengths, eliminating complex branch structures that cause high-frequency interference.

A sound control membrane uses a viscoelastic layer between protective and thermal isolating layers to reduce noise transmission.

Multi-parameter sonar analysis distinguishes reflectors from clutter by comparing echo characteristics against known profiles for precise location mapping.

Integrated apparatus merges motor and silencer to resolve installation reliability issues while absorbing noise via layered partition strips.

An acoustic reflector mounted on an inclined plane redirects sound from a thin transducer upward to create a virtual image outside the speaker enclosure.

Parallel multi-frequency output eliminates serial measurement delays, reducing total time and improving accuracy in active noise reduction systems.

Adaptive feedforward control system disables adaptation at low vehicle speeds, preventing sensor noise misinterpretation and reducing residual noise.

Anechoic tank setup with rotating sonar and lifting hydrophone detects acoustic indexes.

A microcomputer adjusts drive signal frequency and pulse width to maintain optimal sound pressure.

Sinusoidal admittance grooves on a planar plate steer sound waves toward specific directions, reducing unwanted omnidirectional transmission.

Extrapolates discrete reference variables to generate continuous signals for active noise control systems.

Extracting body vibration signals eliminates multiple wheel sensors, reducing apparatus complexity while maintaining effective active noise cancellation.

Ultrasound transducer sub-apertures steer echo signals to common points via applied delays, enabling spatial compounding without multiple look directions.

Storing pre-installation ringing times allows dynamic reception window adjustment, reducing shortest detectable distance and improving measurement precision.

Mesoporous sound-absorbing particles improve speaker sensitivity by resolving the contradiction between strength and air flow smoothness.

A porous metallic body with cylindrical channels attenuates aviation turbine noise through viscous dissipation in boundary layers.

Molded flexible foam shroud eliminates complex assembly by snapping around appliances, reducing noise without rigid panels.

Dynamic gain adjustment reduces audible hiss in quiet environments by lowering ANC strength when ambient noise falls below threshold values.

A smartphone generates anti-phase signals using its built-in microphone and processor to cancel ambient noise in headphones.

Combining road and engine sensor signals into one processing path reduces system complexity while maintaining effective acoustic cancellation.

An aircraft landing gear bay door uses an aerofoil profile to slow airflow and reduce noise during deployment.

A reconfigurable active noise reduction circuit dynamically adjusts signal processing topologies to optimize anti-noise generation.