Sound Producing Devices TRIZ Cases

Injecting inaudible test signals maintains secondary path adaptation accuracy when source audio is absent, preserving noise cancellation effectiveness.

An automated wind chime uses a motor-driven wobble arm to create erratic swaying motion that strikes percussion targets, producing music without wind.

Predetermined shading windows reduce computational complexity in adaptive beamforming while maintaining interference suppression and signal sensitivity.

A connection module links parallel panels using a base element and suspended mass.

A sub-array receiver beamformer updates analog delay slopes via profile registers to maintain dynamic focusing while reducing power consumption and device size.

A motorized acoustical banner uses a drum roller configuration to enable quick fabric changes without full device disassembly.

An audio filtering system generates inverse sound waves to isolate intended streams from mixed ambient output.

Pre-computed filter parameters stored in a mesh bank enable rapid interpolation for focused output signals.

A decentralized active acoustic control system generates independent signals to minimize transmitted and reflected sound components using finite 2D arrays.

A control signal generation unit produces correction signals based on sine and cosine waves to manage vibration noise frequencies.

A three-segment horn suppresses wave guidance through asymmetric geometry, eliminating unwanted sound lobes and false detections.

Generates active noise cancellation signals from actuator interference frequency to eliminate time delays in motor vehicle noise reduction.

Controller adjusts canceling signal time delay and amplitude based on reference distance to target occupant head position.

A floating sensor holder maintains wireless connectivity for fish finders by keeping the interface above water while submerging the sonic transducer.

A marine sonar display device uses frequency steering to generate near real-time sonar imagery from varying beam angles.

A phase shifter modifies an anti-noise signal derived from a control-status signal to generate destructive interference with acoustic noise waves.

A system combines first and second sound field parameters to generate a third parameter with intermediate acoustic characteristics.

A low-delay hybrid noise reduction system uses biquad filters for initial processing and a low-stage FIR filter for adaptive modulation.

Threaded stud and acorn nut sandwich an acoustic sensor to prevent signal loss from unstable mounting.

Segmented filter banks reduce device complexity and power consumption while maintaining reliable noise cancellation effectiveness.

Audio system extends movie scenes and adds reverberation based on detected audience laughter, eliminating trial screenings while improving comedic effect.

A periodic array of spaced-apart Helmholtz resonators achieves broadband acoustic absorption through layered geometric configurations.

Segmented damping elements optimize vibration attenuation across wide temperature and frequency ranges, resolving ultrasonic sensor interference.

Transient activity detection selectively disables the adaptation module during sudden noise events, preventing signal amplification and audible artefacts.

Thresholds on reference and error paths stabilize weight coefficients against non-Gaussian impulsive road noise, improving convergence speed.

Dynamic leakage factor adjustment reduces afterglow artifacts during sudden engine RPM drops.

Adaptive noise control apparatus identifies acoustic properties in real time to maintain continuous sound reduction without halting the process.

A secondary acoustic source generates anti-phase signals to cancel collar vibrations within an acoustic logging tool.

A reverberant sound adding apparatus generates addition noise with random time intervals to control sound density in audio signals.

Segmenting the ANC filter into parallel static and adaptive units resolves the contradiction between design complexity and robustness to wearing styles.

A coherence-based dynamic stability control system adjusts noise cancellation parameters using processor feedback loops.

Combination unit merges sensor inputs into a virtual reference signal to reduce computational burden while maintaining noise cancellation performance.

Averaging unit calculates error signals across multiple virtual microphone positions to expand the quiet zone in vehicle cabins.

Series microphone connections reduce wiring harness weight while parallel switches minimize voltage drops for stable power delivery.

Segmenting audio signals and selectively amplifying segments generates higher frequency harmonics, replacing synthetic noise with authentic engine acoustics.

A vehicle sound output device uses a phase shifter to adjust signal timing between opposing speakers for consistent cabin audio.

Segmented transducer housing supports multiple mount adapters to eliminate inventory complexity while maintaining sonar performance.

A microphone array positioned symmetrically around a listening point calculates averaged secondary path transfer characteristics for adaptive noise control systems.

An audio control system applies active anti-noise signals to speakers, reducing unwanted tire noise within the vehicle cabin.

A noise reduction controller differentiates adaptive update timings for control and secondary path filters to lower computational load.

A sound signal processing device detects listener environment acoustic characteristics to adjust reproduction parameters.

A composite loudspeaker cone uses a balsa wood interstitial layer between carbon fiber sheets to support pistonic operation.

Segmented acoustic shields balance insulation reliability with absorption performance by controlling foam impregnation rates across distinct material zones.

A parallel compensator system processes audio signals to generate acoustic output for active noise reduction headphones.

A sound cancellation system combines non-sound signals representing desired audio and ambient noise to produce a mixed output.

An airfoil element mechanically couples armature motion to surrounding air for sound generation.

Segmenting the transducer array into shared-channel regions resolves wiring complexity while restoring transmitted beam deflection capability.

Quarter-wavelength resonator pairs absorb flexural waves to reduce airborne noise transmission.

An acoustic processing apparatus converts content characteristics using head-related transfer functions to recreate a target sound field.