Tactile Signal Decoding with Frequency-Band Quantization
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Solution Overview
Problem
The increasing number of channels for tactile stimuli in tactile reproduction systems leads to higher data amounts, causing processing load and transmission delays, which are undesirable.
Innovation Solution
A decoding device that encodes tactile signals for each frequency band, reducing bit distribution for imperceptible tactile properties by using different quantization bit lengths and sampling frequencies, and employing entropy encoding to minimize data while ensuring reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of channels for tactile stimuli is increased to improve tactile reproduction quality, then the tactile reproduction capability is improved, but the amount of data increases leading to processing load and transmission delays
Solution Approach 1:
The tactile signal is segmented into multiple frequency bands (e.g., low frequency band and high frequency band). Each band is processed and encoded separately, allowing selective transmission of only the perceptually important components. This segmentation enables the system to maintain tactile reproduction quality by preserving essential frequency information while reducing overall data volume and transmission time.
Solution Approach 2:
Different quantization bit lengths are applied to different frequency bands based on their perceptual importance. The low frequency band, which corresponds to perceptible tactile sensations, is allocated more bits (e.g., 8 bits), while the high frequency band, which is less perceptible, is allocated fewer bits (e.g., 4 bits). This local quality approach optimizes the balance between reproduction fidelity and data efficiency.
2Measurement precision
If the quantization bit length is increased to improve signal precision, then the signal precision is improved, but the amount of data increases leading to higher processing load
Solution Approach 1:
The patent applies different quantization bit lengths to different frequency bands according to their perceptual significance. The low frequency band (0-500 Hz) uses 8-bit quantization to preserve perceptible tactile details, while the high frequency band (500-2000 Hz) uses 4-bit quantization since these frequencies are less perceptible. This local differentiation maintains measurement precision where needed while reducing processing load overall.
Solution Approach 2:
The system changes the quantization parameter (bit length) based on the frequency band. By dynamically adjusting the quantization precision according to the perceptual characteristics of different frequency ranges, the system achieves optimal balance between signal precision and processing efficiency, reducing unnecessary computational overhead.
3Device complexity
If uniform quantization bit length is applied to all frequency bands to simplify encoding, then the encoding complexity is reduced, but the efficiency of tactile signal transmission is compromised
Solution Approach 1:
Instead of uniform quantization, the patent implements local quality by applying different quantization bit lengths to different frequency bands. The low frequency band uses 8-bit quantization while the high frequency band uses 4-bit quantization. This approach increases encoding complexity slightly but dramatically improves data transmission efficiency by allocating bits according to perceptual importance, reducing overall data volume while maintaining essential tactile information.
Data Source
AI summary
A decoding device comprising a decoding unit configured to decode a tactile signal encoded for each of frequency bands. A decoding method comprising decoding a tactile signal encoded for each of frequency bands. A non-transitory storage medium encoded with instructions that, when executed by a computer, execute processing comprising decoding a tactile signal encoded for each of frequency bands.