Audio Device Cadence Adjustment via Digital Interpolation
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Solution Overview
Problem
During exercise sessions, the cadence of music played on personal audio devices often does not match the exerciser's cadence, leading to disruptions in the workout routine.
Innovation Solution
A personal audio device system that adjusts the cadence of songs by receiving cadence data from user sensors, such as those integrated with shoes or exercise machines, and uses interpolation or decimation of digital song representations to match the desired cadence, ensuring the music's tempo aligns with the exerciser's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If music from a playlist is played during exercise, then the exerciser can listen to songs for entertainment, but the cadence of the music may not match the exerciser's cadence, disrupting the workout routine
Solution Approach 1:
The system dynamically adjusts the cadence of music tracks in real-time to match the exerciser's detected cadence. The audio processing unit modifies the temporal characteristics of the music on-the-fly, allowing the same playlist to adapt to varying exercise intensities and maintain synchronization with the user's movement rhythm, thereby resolving the contradiction between music selection flexibility and workout consistency
Solution Approach 2:
The system continuously monitors the exerciser's cadence through sensors (such as accelerometers in shoes or exercise machines) and uses this feedback to adjust the music cadence. This closed-loop control ensures that the music remains synchronized with the user's exercise rhythm, maintaining workout consistency while allowing diverse music choices from the playlist
2Reliability
If the cadence of songs is adjusted to match the desired cadence, then the music synchronizes with the exerciser's pace, but the period of the back beat must be modified through interpolation or decimation of digital song representations
Solution Approach 1:
The system changes the temporal parameters of the digital audio signal by applying interpolation when the desired cadence is slower than the original music, or decimation when the desired cadence is faster. These parameter modifications adjust the spacing between audio samples to achieve the target cadence while maintaining musical integrity, balancing synchronization reliability with processing complexity
Solution Approach 2:
The audio processing unit acts as an intermediary between the original music tracks and the exerciser's exercise cadence. It processes the digital representations of songs through interpolation or decimation algorithms to bridge the gap between fixed music tempo and variable exercise rhythm, achieving synchronization without requiring complex real-time music generation
Data Source
AI summary
Disclosed is an audio device that adjusts the cadence of played songs. A user sensor determines cadence data based on movement of the user. A desired cadence is determined based on the cadence data received from the sensor. The cadence of songs is determined by low pass filtering digital representations of the songs and determining the period (T) of the back beat of the songs. An adjustment of the period (T) of the songs is then determined such that the adjustment of the period (T) of the songs results in the songs having the desired cadence. The period (T) of the back beat of the subsequent songs are then adjusted.