Vehicle Acceleration Sound Delay Unit for Smooth Pitch Control

The patent applies preliminary action by introducing a delay unit that anticipates the harmful effect of sudden sound changes. The delay unit processes the control parameter (accelerator opening degree) before it reaches the sound generation unit, pre-smoothing the signal to prevent abrupt changes. This proactive approach maintains responsive sound generation while eliminating passenger discomfort during rapid acceleration.

The patent employs an intermediary approach by inserting a delay unit between the control parameter input and the sound generation unit. This intermediary component smooths the control parameter signal, acting as a buffer that translates sudden acceleration inputs into gradual sound changes. The delay unit preserves the correlation between acceleration state and sound output while ensuring smooth transitions that match actual vehicle dynamics.

The patent applies partial action by implementing a delay unit with optimized delay characteristics that provide just enough smoothing to prevent passenger discomfort without excessive delay. The delay unit processes only the necessary portion of the control parameter signal, applying minimal but sufficient delay to smooth abrupt changes while maintaining acceptable response time. This balanced approach eliminates harmful sudden sound changes while preserving timely sound generation.