Microphones TRIZ Cases

A second source follower and distortion feedback adjust bias current in a dual-backplate MEMS microphone amplifier to limit noise and large-signal distortion.

By combining microphone input, sound source level, and vehicle speed, this case estimates cabin noise to keep audio volume audible without degrading sound quality.

Dynamic voltage switching gives the power amplifier higher drive at low frequencies, improving speaker sound while cutting power use.

A single MEMS transducer works as microphone and loudspeaker at once, enabling faster active noise reduction with fewer parts.

A flexible earcup electrode conforms to head and ear shapes to stabilize capacitive sensing, cut false positives, and save headset power.

Digital open-loop correction shifts the MEMS microphone LFRO pole to improve frequency consistency and manufacturing yield.

By excluding acoustic null frequency ranges from EQ correction, this case improves target response while avoiding loudspeaker overdriving and wasted power.

A group coordinator decodes and routes media by device capability, enabling synchronized playback across resource-limited IoT and SONOS systems.

A diagnostic circuit compares node voltages against thresholds to detect leakage currents from particle contamination in capacitive sensors.

A calibration circuit compares DAC output with a second reference to correct reference drift, preserving audio fidelity with lower power use.

Automatic switching between ANC profiles and amplifier voltage cuts headset power use on battery while preserving effective noise reduction.

Bonding pad capacitances balance asymmetric MEMS microphone signals to improve THD, acoustic overload point, SNR, and dynamic range.

Automatic profile switching cuts headset ANC power use off-vehicle, preserving adequate noise reduction and extending battery life.

A correction block adjusts the digital audio signal to offset disabled ZOR parasitic charge diversion, improving fidelity and power efficiency.

Integrated transducers, microphones, and control circuitry cut wiring complexity while enabling precise multi-speaker audio control in confined spaces.

Two calibrated microphones and threshold-based mixing widen headset speech range while reducing distortion, floor noise, and SNR loss.

Adaptive voltage switching lets the power amplifier match speaker load, improving external audio dynamics while reducing power consumption.

Parallel gain paths and power-state control let a MEMS microphone switch modes with high dynamic range, low latency, and no audible artifacts.

Capacitance-based force electrodes and a spring member let a stylus detect non-binary press input while reducing false touches and mechanical tapping.

Opposite gain control between the buffer and ADC preserves microphone SN ratio while preventing saturation and protecting dynamic range.

Ultrasonic air pulses from a piezo-actuated membrane deliver full-range sound in compact devices without multiple drivers or large enclosures.

Spaced conductive films on insulating layers place larger diaphragm areas in strong magnetic fields to extend ribbon speakers into low frequencies.

Capacitive force sensing in an earphone stem replaces tapping and buttons to cut audio disruption, false inputs, and power use.

Dynamic amplifier voltage tracks volume level to cut unnecessary power use and extend audio playback time without sacrificing output quality.

A common-mode feedback loop corrects differential MEMS microphone mismatch by adjusting bias AC coupling to reduce asymmetry and THD.

A common-mode feedback loop corrects differential MEMS microphone channel mismatch to reduce asymmetry and THD at high sound levels.

Capacitive force sensing in an earphone stem replaces tapping and buttons, reducing audio disruption, false inputs, and microphone interference.

Interchangeable amplifier and power modules enable fast rack-compatible assembly while adapting sound systems to changing power and frequency needs.

Programmable headset accessory circuitry stores audio settings and exchanges power and data with the headset for customizable gaming audio.

Common-return current monitoring with an adaptive filter tracks stereo load impedance changes, preventing overdrive and preserving sound quality.

Acceleration sensing detects when the wearer speaks, switching earbuds into ambient sound mode without manual controls or removing the device.

Variable gain from a dedicated noise microphone cuts lens drive noise during video recording while avoiding distortion and quantization noise.

Matched JFETs, BJTs, and a current sink boost low microphone signals to line level with lower noise and less signal degradation.

A capacitive force-sensing earphone stem replaces buttons and tapping, reducing audio disruption and microphone interference during worn input.

Predicting future wireless audio values helps hearing aids offset transmission delay, reduce comb filtering, and keep speech in sync.

By removing the separating capacitor and polarization resistor, this preamplifier preserves infrasound sensitivity and undistorted low-frequency measurement.

Feedback-controlled DC bias and high-pass filtering keep film-speaker terminal voltage stable, reducing distortion and harmonic noise.

Noise shaping in a piezoelectric loudspeaker PWM loop shifts quantization noise beyond audible frequencies while correcting nonlinearity.

Adaptive auto-gain uses hear-through and leakage noise levels to keep radio communication clear while preserving situational awareness.

Interchangeable amplifier and power modules speed assembly and adapt wave field synthesis setups to changing power and frequency demands.

A compensation capacitor and opposite-phase node stabilize super source follower input impedance, reducing MEMS self-oscillation and signal loss.

Capacitive force sensing in the earphone housing replaces tapping and buttons, reducing audio conduction and microphone interference.

Capacitive force sensing replaces earphone tapping, reducing audio disruption, false inputs, and power use while enabling intentional local control.

Capacitive-feedback slew control cuts microphone buffer delay while keeping rise and fall times stable across PVT shifts and load capacitance.

Microphone-array listening separates TV audio from room talk to localize volume changes and preserve audibility without disrupting conversations.

Distance and height-based source localization lets array microphones adjust lobe gain automatically for more consistent talker levels.

A two-wire serial bus carries audio, control data, and low power while separate high-power speakers cut vehicle wiring weight and harness complexity.

A source follower holds voltage across parasitic Cgd to curb capacitive loading and improve microphone THD and sound quality.

Injected test tones and input-output sampling correct gain shifts between output resistance modes, preserving audio fidelity with lower power use.

A dynamic model tracks load capacitance and battery voltage so the filter avoids worst-case overfiltering while preventing artefacts and overcurrent.

A bilateral microphone array system creates separate left-ear and right-ear audio signals using multiple microphones arranged externally.

A hybrid beamforming system adjusts filter weights dynamically to isolate desired audio signals from microphone arrays.

A DC bias circuit uses an adjustable switched capacitor resistor to set the low-pass filter cut-off frequency.

Earphone housing movement sensor detects user input to execute commands via simultaneous activation signals.

Virtual microphones match occupant ear acoustics to resolve incomplete noise reduction from arbitrary sensor locations.

Segmenting the cavity into sub-cavities via lateral movement increases interaction area with ambient fluid while minimizing electrical capacitance loading.

Segmenting command processing reduces network latency while audio beam forming tracks user location for accurate interaction.

A speaker system uses a multi-tweeter array to form a smooth wave surface for constant directivity.

A rotatable microphone array adjusts orientation to capture audio signals from specific directions within an ear-mountable listening device.

A sound pickup device computes amplitude spectrum ratios and coherence sum values to extract target area sound from microphone array outputs.

An earphone microphone uses two external receivers and one internal receiver to capture sound signals from different acoustic paths.