Non-linear Compression for Vehicle Control Signal Transmission
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Solution Overview
Problem
Existing systems for transmitting finger movement coordinates from a vehicle's steering wheel require high bandwidth due to high resolution, which is not feasible with inexpensive data buses like LIN, necessitating a method to reduce data transmission while maintaining accuracy.
Innovation Solution
A method involving non-linear compression and decompression of finger movement coordinates using optical signals, where lower speeds are resolved more finely than higher speeds, allowing data reduction to eight bits per coordinate, and error is kept below the user's perception threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution transmission of finger movement coordinates is used, then measurement precision is improved, but data transmission bandwidth requirement increases
Solution Approach 1:
The patent applies non-linear compression to transform the coordinate data parameters. The compression characteristic is designed such that lower speeds are resolved more finely than higher speeds, adapting the precision to the actual movement characteristics. This allows maintaining perceptual accuracy while reducing the data bandwidth from 16 bits to 8 bits per coordinate.
2Quantity of substance
If data compression is applied to reduce bandwidth, then data transmission requirement is reduced, but measurement precision deteriorates
Solution Approach 1:
The compression characteristic is designed with local quality variation: lower speeds are resolved more finely than higher speeds. This matches the human perception characteristics where slow movements require higher precision while fast movements tolerate coarser resolution. The error caused by compression is kept below the user's perception threshold, maintaining effective precision.
3Quantity of substance
If non-linear compression is used to reduce data size, then data transmission bandwidth is reduced, but device complexity increases
Solution Approach 1:
The patent implements compression and decompression algorithms that are computationally efficient and can be executed on inexpensive microcontrollers commonly found in automotive systems. The algorithms process data in real-time without requiring complex hardware, making the added processing complexity acceptable for the significant bandwidth reduction achieved.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient transmission of finger movement coordinates over low-bandwidth data buses with minimal perceptible error, reducing data requirements while maintaining accuracy for user input.
Implementation Method 1
A direction of movement of the finger is transmitted in the form of delta X and delta Y coordinates... The optical signal is reflected by the finger and detected by a receiving unit
Data Source
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AI summary
The invention relates to a method for compressed transferring of signals of a control element (40) comprising movement coordinates to a display unit (60) in a vehicle (1), said method comprising the following steps: a transmitting (S100) of an optical signal to an interface of the control element (40); a receiving (S200) of an optical signal reflected by a finger of a user on the interface of the control element (40) in a predetermined scan cycle; a converting (S300) of the reflected optical signal into a digital signal, which comprises relative movement coordinates of the finger in the predetermined scan cycle in a first direction and a second direction, perpendicular to the first direction; a compressing (S400) of the relative movement coordinates of the finger in the first direction and the second direction by means of a non-linear compression characteristic curve (70) to achieve a compressed digital signal; a transferring (S500) of the compressed digital signal to the display unit (60); and a decompressing (S600) of the compressed digital signal in the display unit (60) by means of a non-linear decompression characteristic curve (100) which is inverse to the non-linear compression characteristic curve (70). The invention furthermore relates to a device which has apparatuses designed to carry out the method.