Sound Producing Devices TRIZ Cases

See how asymmetric compression member placement increases stiffness and moment of inertia witho

See how micro-perforations (0.20-0.70 mm) in furniture surfaces act as Helmholtz resonators to

See how non-symmetric mounting bracket placement with non-parallel axes eliminates resonance an

See how a horn-shaped decanter with mouthpiece and bell serves both wine aeration and musical t

Abutting parts and spring bias keep an ultrasonic sensor head at stable insertion depth, maintaining flush bumper alignment on curved surfaces.

Time-based switching from cranking to explosion audio recreates realistic virtual engine startup sound in battery electric vehicles.

Using squared sound-pressure error signals from multiple microphones, this case stabilizes vehicle cabin noise cancellation across acoustic modes.

Matching vibration signals to vehicle speed improves speaker-based noise reduction accuracy and stability across changing driving conditions.

A rib-supported silicone decoupling element limits vibration transfer from the membrane to the plastic housing, improving echo detection.

Actuators carry both control and communication signals through vibration, cutting wiring and extra radios while improving multi-unit suppression and fail-safe response.

By embedding data in actuator drive vibrations and extracting it from sensor signals, multiple units coordinate suppression without cables or extra radios.

Microwave-foamed rubber sponge with carbon nanotubes and internal hollow cells improves low-frequency sound absorption while resisting water.

Aligned C-shaped phononic crystal units redirect incident sound into one lateral direction while limiting multi-direction transmission.

Selective in-vehicle alerts preserve cabin quietness while detecting and notifying occupants of nearby collision sounds and other hazards.

Sensors, an actuator, and feedback control boost low-frequency damping in an acoustic black hole damper while reducing resonances.

Adjustable membrane stiffness lets a compact resonance tube absorb low-frequency vehicle or aircraft noise without added size or weight.

An added motor control signal makes the vehicle roof vibrate as a loudspeaker, masking roof-drive noise while emitting warning tones or music.

Stored adaptive filter coefficients let vehicle road-noise cancellation resume quickly after startup while avoiding divergence and instability.

Monopole and dipole resonators with levers absorb flexural waves at matched frequencies, cutting vibration and airborne noise without added weight.

A resilient damping ring on the sprocket drum absorbs tooth-bushing impacts, cutting track undercarriage noise by 2.5-8.8 dBA.

A fluid matrix with spherical metal aggregates forms a continuous damping layer that avoids gaps and air pockets while simplifying application.

A roughened spindle housing diffusely reflects high-frequency spindle noise, improving dental prosthesis machining comfort.

A roughened spindle housing diffusely reflects high-frequency spindle noise in dental prosthesis machining, improving operator comfort.

A resilient damping ring retained on the sprocket drum absorbs track-link impacts to cut undercarriage noise by 2.5-8.8 dBA.

A toroidal unit cell with inclined struts amplifies rotational inertia to widen low-frequency band gaps without adding mass density.

Real-time harmonic extraction and adjustment keep in-cabin engine sound natural and consistent across hybrid power transitions.

Frequency-response smoothing finds local minima for audio band split points, preserving filter effects and out-of-head localization.

Per-harmonic phase and gain tuning shifts engine harmonic sound stage width and location with RPM and load for a tailored in-cabin audio experience.

Combining analog beamforming and ADC in the probe cuts cable count, lowers signal degradation, and simplifies ultrasound system design.

Phase and gain differences across audio channels move sound stage width and location with engine RPM and load to improve harmonic masking.

Per-harmonic phase and gain tuning shifts sound stage width and position with engine RPM and load for a more immersive cabin sound.

A sliding high-pass filter shifts low-frequency cutoff to vary loud hailing beam spread for targeted speech or wider area coverage.

Distributing alarm tones across non-overlapping critical bands cuts crest factor and power demand while preserving perceived loudness.

Voxelization and 2D projection maps cut diffraction modeling cost while preserving realistic virtual source placement in 3D audio scenes.

Adaptive momentum-based FxLMS control speeds convergence for cancelling low-frequency vehicle engine noise and improving cabin listening comfort.

A frequency controller corrects engine-speed drift in active noise reduction, helping adaptive filters avoid unusual sounds during abrupt changes.

Recorded driving logs and gradient-based simulation automate active road noise cancellation tuning, cutting manual setup time.

Mechanical resonator arrays spaced by wavelength create narrow bandpass filtering that transmits target flexural waves and suppresses damaging noise.

A delayed echo of an occupant's own voice discourages talking in shared vehicle compartments without headphones or direct requests.

Time-varying phase shifts steer array beams and frequency together, enabling single-transmission 3D target detection with simpler circuitry.

Machine-learning presets detect ambient noise patterns and automatically block sudden low-frequency sounds like fireworks to protect hearing.

Trigger-word detection lets a headset pause playback, adjust ANC, and replay relevant nearby speech so users do not miss important external audio.

Dual microphones and active noise control replace fixed earplug filters, adapting attenuation by sound level and frequency for protection and clear audio.

Laser welding joins transparent connecting edges to an opaque acoustic skin, avoiding adhesive intrusion and heat deformation in hollow elements.

A two-stage thermoforming process shapes and presses an acoustic component onto a multicellular body, cutting assembly steps and deformation risk.

Boundary sound pressure nulls and outward masker control keep target audio audible in the listening zone while reducing voice leakage outside.

Dual control filters and band-limited coefficient updates reduce ANC noise while preventing noise increases when causality is not met.

Combining manifest and license requests cuts client-server round trips, reducing playback startup delay while preserving validation and licensing.

Fixed-phase, frequency-varying transducer arrays create left, right, forward, and down live sonar images with fewer arrays and less footprint.

Agitated oxygen-rich liquid forms bubbles around a sound source, scattering and absorbing noise across a wider frequency range.

Frequency-domain secondary path estimation cuts convolution load, improving active noise reduction speed and effectiveness.

Modifying delay or decay while compensating reverberation energy enables flexible VR audio rendering with lower processing load and natural sound.

Parallel static and adaptive ANC filters improve noise cancellation across wearing styles while avoiding the instability and complexity of fully adaptive control.

Spectral band swapping creates zone-based masking noise that blocks eavesdropping while keeping sound levels and listener disturbance low.

Self-positioning engagement members align the radar housing and base, enabling automated assembly without molds and reducing labor costs.