Pilot Signal Control TRIZ Cases

Digital filter banks let a cable amplifier alternate upstream and downstream bands, cutting interference and avoiding complex echo cancellation.

Separating dialog and non-dialog audio enables user-tuned loudness balance with automatic long- and short-term correction for listening comfort.

Digital filter banks let a cable amplifier alternate upstream and downstream over overlapping bands, cutting interference and echo-cancellation load.

Adaptive driver circuitry lowers ultrasonic amplitude and reshapes pulses during loud audio to reduce intermodulation distortion.

Inaudible reference tones reveal system AGC over time, letting recordings recover original dynamics without hardware changes.

Short- and long-term gain matching aligns analog and digital audio loudness, smoothing IBOC blend transitions and reducing abrupt level shifts.

Low-frequency impedance sensing lets an application processor cut speaker power before overheating or overload, avoiding costly ADC-based protection.

Stored gain settings from idle periods define a restricted AGC range during payload reception, limiting saturation from random interferers.

Inaudible pilot tones track AGC changes during recording, allowing audio apps to infer gain history and restore original dynamics.

Position-based current vectoring across multiple voice coils compensates DMP drift and non-linear magnetic coupling in acoustic transducers.

Short- and long-term loudness averaging aligns analog and digital IBOC audio levels to avoid abrupt, harsh blend transitions.

Stored loudness values for each audio source keep volume consistent across stations without pumping, abrupt changes, or manual adjustment.

Dynamic ultrasonic amplitude, duty cycle, and bandwidth adjustment cuts intermodulation distortion while preserving audio playback and ultrasonic function.

A pilot-tone calibration loop adjusts amplifier gain to keep unity-gain frequency in range despite LC tolerance spread and cost-driven variation.

Dual feedback controllers monitor loudspeaker temperature and power, reducing the drive signal to prevent thermal and mechanical failure.

Real-time back-EMF sensing limits speaker over-excursion at low frequencies while preserving bass response and sound pressure.

Voice coil temperature is estimated from impedance, using a pilot tone at low signal levels to prevent speaker overheating and damage.

An AGC uses stored preamble-era gain history to limit payload gain range, improving wireless receiver immunity to random interferers.

Predictive attenuation tracks output amplitude and supply droop to prevent amplifier clipping and brownout in battery-powered audio paths.

Pre-stored loudness values let audio sources switch at consistent volume while avoiding pumping, reduced dynamics, and manual readjustment.

A reset mechanism lets audio dynamics processing adapt quickly to channel or input changes while preserving smooth short-term dynamics.

Separating dialog and non-dialog audio enables adaptive gain correction that improves intelligibility and comfort while reducing artifacts.