Sound Producing Devices TRIZ Cases

Active counter-vibration system eliminates disruptive sound emissions through milling stock tubes without requiring mechanical enclosures.

An acoustic attenuator with an elongate open aperture absorbs noise via cavity resonance while allowing air and water passage to resolve drainage trade-offs.

Capacitors replace batteries in this doorbell design, eliminating bulky components while maintaining stable voltage during button presses.

A terminal device generates a masking sound signal through its speaker to cover audio leaked from the receiver.

A tuned resonant cavity in the horn throat cancels standing waves from midrange leakage, correcting frequency response dips.

A hybrid adaptive noise cancellation system generates anti-noise signals using feedforward and feedback filters to minimize ambient audio sounds.

Combines analog and digital feedforward circuits to reduce signal processing delay in audio headsets.

A noise control device generates a 180° phase-shifted signal to cancel ambient sound waves.

Adaptive acoustic transmission filters update based on error signals to maintain cancellation performance despite changing vehicle acoustics.

Aromatic polyether ketone film containing dispersed fluororesin particles enhances mechanical strength and abrasion resistance.

Elevated mechanical resonators on a substrate block bending waves, reducing structural vibration and noise propagation in lightweight vehicles.

Wavelet denoising and convolutional neural networks isolate submarine signals from marine background noise.

An acoustic impedance matching device uses a horn with increasing cross-section and density to reduce rear wave reflections.

Multi-angle ultrasound scanning detects side lobe noise in binarized input images to remove artifacts before compounding, ensuring high-resolution output.

A duct profile equation maintains fluid momentum to prevent boundary layer separation and optimize acoustic performance.

A vehicle trim damping device absorbs ultrasonic sensor vibrations through mechanical oscillation of movement elements.

A compact circumferential acoustic resonator amplifies low frequency alarm tones through radial dimensionality changes.

Piezoelectric membrane element oscillates at higher frequency to generate heat above icing temperature.

Codesigned air shroud channels airflow through baffles made of acoustically absorbent material to cool components.

Distributed noise cancellation controllers linked via automotive audio bus reduce wiring weight and processing latency compared to single module architectures.

Layered jacket absorbs tonal and broadband noise from compressor vibrations, converting acoustic energy into heat to reduce harmful sound levels.

A multi-channel matrix mixer applies geometric transformations and consistent delays to input soundfield signals.

An acoustic scatterer array absorbs sound waves through monopole and dipole resonances.

A variable step-size adaptation method adjusts control coefficients to reduce low-frequency noise in vehicles.

External microphones bypass active noise cancellation processing to preserve critical sounds like sirens while reducing wind noise.

Weighted error signal adaptation in the adaptive filter bank ensures uniform noise attenuation across varying operating conditions.

Integrates an acoustic error sensor directly into the loudspeaker front face to minimize secondary path length and reduce response latency in active noise control.

Adjusting noise-cancellation signal power and adaptation rate via an adjustment module based on real-time signal-to-noise ratio conditions.

Plastic deformation of a soft solid intermediate layer eliminates air pockets and adhesive failure at extreme temperatures.

Reflective housing mirrors redirect rear acoustic energy to improve sensitivity and reduce production costs.

Segmented acoustic diffusers resolve manufacturing complexity by enabling customizable angular coverage through modular assembly and vertical stacking.

Adjusting leakage factors based on triggering conditions minimizes audible artifacts while maintaining system stability during active noise reduction.

Synchronization signals enable dynamic calculation of antiphase waves, resolving distortion issues that limit distance-based noise cancellation.

An acoustic lens redirects soundwaves from a transducer to off-axis directions via refraction and reflection mechanisms.

A processing system dynamically adjusts active noise cancellation and modified incoming audio components based on real-time acoustic characteristics.

Polyethylene third matching layers improve ultrasound transducer bandwidth while eliminating protective coatings to reduce manufacturing costs.

Harmonic filtering segments narrowband content from broadband reference signals, preventing instability and boosting in overlapping frequency regions.

A soundproof structure uses an inclined film and spacer to balance absorption efficiency with required air permeability.

A noise control device uses a filter coefficient calculator to set fixed coefficients for acoustic cancellation.

Distributing transducers along a horn maintains peak pressure while resolving impedance mismatch issues that limit power delivery in low-frequency ranges.

A noise cancellation system adjusts signal magnitude based on detected ambient levels to conserve power in portable devices.

A dynamic acoustic control system adjusts reverberation time using active sound reintroduction and passive absorption materials.

An active masking acoustic signal generator introduces complementary harmonic tones and dithering into an electric motor to improve sound quality.

Pre-calculating acoustic impulse responses allows real-time simulation of multi-room audio propagation without consuming excessive computational resources.

A hidden ultrasonic sensor assembly uses a preload structure and coupling element to mount flush against vehicle panels.

Frequency-segmented adaptation suppresses hiss and artefacts in adaptive noise cancellation systems by applying region-specific processing.

A sound pressure signal output apparatus synthesizes realistic engine audio using segmented data components.

An active noise damping system computes interfering sound to cancel braking vibrations in the passenger compartment.

Copolymer emulsion with specific modifiers improves vibration damping at high temperatures.