Vehicle Audio Signal Generation via Dynamic Frequency Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid and electric vehicles face challenges in generating sounds that meet auditory standards, particularly at low speeds, and in creating recognizable brand sounds that are audible and attractive to users, due to the lack of correlation between vehicle state and sound characteristics, and the need to overcome ambient noise issues.
Innovation Solution
A method for generating an audio signal representing the dynamic state of a land vehicle by processing an input audio signal into audio frames and sub-frames, applying frequency and amplitude shifts based on vehicle parameters like engine speed and position, to produce a synthetic sound that mimics the vehicle's state and driving conditions, using a processor-driven apparatus with acoustic actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electro-acoustic devices generate synthetic sounds using engine orders in hybrid and electric vehicles, then the sounds can be produced when the engine is inactive, but the sounds lack correlation with the actual vehicle state and driving conditions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting sound characteristics (frequency, amplitude, spectral content) based on real-time vehicle state parameters such as speed, acceleration, and driving mode. This ensures the synthetic sounds remain correlated with actual vehicle conditions while maintaining generation capability in electric mode.
Solution Approach 2:
The system implements feedback by continuously monitoring vehicle state parameters and using them to modulate the synthetic sound generation. The sound characteristics are adjusted in real-time based on feedback from sensors measuring vehicle dynamics, ensuring accurate correlation between vehicle state and produced sounds.
2Illumination intensity
If the sound intensity is increased to meet auditory standards and overcome ambient noise, then the sounds become audible, but the quality and recognizability of the sound may deteriorate
Solution Approach 1:
The patent applies local quality by differentiating sound generation in different spatial and operational contexts. Different sound profiles and quality parameters are applied based on specific driving conditions, speed ranges, and ambient noise levels, ensuring high sound quality is maintained even at varying intensities required to meet auditory standards.
3Adaptability or versatility
If the synthetic sounds are dynamically adjusted to match vehicle state, then the auditory experience is enhanced, but the device complexity increases
Solution Approach 1:
The system implements dynamics by creating a dynamic sound generation architecture where sound parameters are continuously adjusted based on real-time vehicle state. The processing complexity is managed through efficient algorithms that map vehicle parameters to sound characteristics without requiring overly complex computational resources.
Data Source
AI summary
A method for generating an audio signal representing the dynamic state of a land vehicle as a function of the value of at least one first parameter comprises the steps of receiving an input audio signal and dividing the input audio signal into a set of audio frames of given duration; selecting, an audio frame representing the input audio signal; subdividing the selected audio frame into a set of audio sub-frames; determining a probability of transition between orderly pairs of the audio sub-frames and synthesizing the audio signal representing the dynamic state of a land vehicle by generating a sequence of audio sub-frames; computing a centre frequency of the selected audio frame and carrying out a frequency shift of the centre frequency as a function of the centre frequency of the selected audio frame and of the value of at least one first parameter that indicates the dynamic state of the vehicle, thereby generating a frequency-shifted subsequent audio sub-frame.