Frequency Measurement Arrangement TRIZ Cases
- Power Converter Fault Prediction Using Coil Frequency Trends
Electromagnetic induction from a detecting coil tracks switching frequency trends to predict power converter failure before faults appear.
- Synchronous Generator Voltage Loop Filtering for Torsional Stability
A band-rejection filter in the generator voltage loop suppresses torsional-mode frequencies while preserving damping and stable excitation control.
- TIA Bandwidth Testing via Forced Oscillation Feedback
A feedback loop forces TIA oscillation, and a frequency divider enables low-cost bandwidth measurement with standard production test equipment.
- Time-Modulated LC Resonator for Exceptional-Point Sensing
Periodic capacitance or inductance modulation lets a single LC resonator reach an exceptional point for ultra-sensitive perturbation detection.
- Power Supply Frequency Sensing Using Waveform Derivatives
Waveform-derivative peak detection determines power supply frequency in less than a full cycle, improving control response in fluctuating systems.
- Inductive Motion Sensing Circuit With Low-Noise Period Counting
Multiple sensing coils and period counting cut jitter noise and power use while preserving fine moving-body displacement sensing.
- Power Signal Frequency Sensing Using Quarter-Cycle Derivatives
Waveform-derivative sensing determines power signal frequency within a quarter-cycle, improving control response without waiting for a full cycle.
- Noise-Cancellation Sensor Screening for Corrupted Signal Exclusion
Power-spectrum correlation detects corrupted sensor signals, excluding crackling inputs to preserve noise-cancellation performance.
- Noise-Cancellation Sensor Screening for Corrupted Signal Exclusion
Power-spectrum correlation detects corrupted sensor signals and excludes them from noise cancellation to prevent crackling and preserve performance.
- Phase-Coherent Frequency-Hopping Signal Analysis with Common Reference
A common reference frequency and phase lets I/Q-based hop analysis measure frequency-hopping signals more accurately and verify device behavior.
- ADC Phase-Frequency Testing via FM Down-Conversion Delay Correction
Measures mixer-filter delay and corrects FM initial phase to test ADC phase-frequency response beyond sampling-rate limits.
- NMR Signal Detection Using Optical Quantum Sensing
Weak NMR signals are demodulated and filtered, then measured through optical quantum sensing to avoid amplifier noise and improve resolution.
- RF Waveguide Electrometer for Uniform Rydberg Signal Tuning
An RF waveguide along the sensor cell evens tuning across alkali atoms, stabilizing Autler-Townes peaks for more accurate external signal detection.
- Frequency-Adaptive Electricity Meter Calibration Across 50 Hz and 60 Hz Grids
Grid-frequency detection selects 50 Hz or 60 Hz calibration parameters, improving meter accuracy without repeated factory calibration.
- Current Sensor Gain and Phase Correction for Motor Control
Correction module compensates for gain errors and phase delays in magnetic field sensors, ensuring precise motor torque response.
- Frequency Measurement for Electromagnetic Resonance Pen Pressure Sensing
A lookup table maps filtered signal ratios to pen pressure values, compensating for line resistance variations in electromagnetic resonance sensing.
- Digital Clock Regenerator for Jitter Reduction
An averaging unit calculates period length values to stabilize the output clock signal, resolving jitter issues in purely digital designs.
- Frequency Error Detection Using Single Conversion Circuit
A frequency error detection apparatus uses a single conversion circuit to process known signals across varying frame header lengths.
- RF Test Fixture With Grid Base Plate And Adjustable Guides
Grid base plates and adjustable guides position wireless devices relative to an RF antenna, reducing manual setup time.
- Partial Discharge Monitoring via Timing-Synchronized Signal Capture
A monitoring apparatus uses high-frequency and low-frequency sensors to capture digitized data blocks for phase-resolved partial discharge analysis.
- RF Signal Frequency Measurement Using Diamond NV Centers
Diamond nitrogen-vacancy centers detect radio frequency signals via photoluminescence captured by a CMOS camera.
- Complex Adaptive Phase Discriminator for Dynamic Frequency Estimation
Adaptive filter estimates instantaneous frequency of complex signals by iteratively minimizing mean squared error of a complex error signal.
- EEG Motor Imagery Classification Using Multi-Domain Feature Extraction
A motor imagery classification apparatus extracts spatial, temporal, and frequency features from EEG signals using CNN and RNN models.
- Antenna State Determining Circuit Using Oscillation Frequency
An antenna state determining circuit measures oscillation frequency changes to identify connection states without transmission signals.
- Digital Tracking Filter Frequency Pre-warping
A digital tracking filter estimates operating frequencies by pre-warping signal components to prevent aliasing distortion.
- Noise-Cancellation System Corrupted Sensor Signal Detection
A noise-cancellation controller analyzes power spectral density to identify corrupted sensor inputs before they degrade audio output.
- Frequency Monitoring Circuit for Arbitrary AC Signals
A frequency monitoring circuit supervises arbitrary AC signals using a capacitor resettable by edge detection to maintain a constant output.
- Electric Circuit Evaluation Using Segmented Frequency Properties
An electric circuit evaluation method segments malfunction analysis into power, current, and voltage frequency properties for precise design improvement.
- Antenna Tester Calibrating RF Cable Losses
System compensates for RF cable attenuation by measuring received signal strength against a reference, ensuring accurate antenna performance test results.