Handheld Media Player Tempo Sync via Accelerometer
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Solution Overview
Problem
Current portable media devices lack advanced features for dynamically adjusting music tempo to match user activity, such as exercise pace, which can enhance workout motivation and endurance.
Innovation Solution
A hand-held media player equipped with an accelerometer and processor that senses body motion and adjusts music tempo in real-time to synchronize with the user's activity, using pre-formatted music versions with different tempos stored on the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If real-time tempo adjustment is implemented, then user motivation and workout effectiveness are improved, but device complexity increases
Solution Approach 1:
Multiple pre-formatted versions of the same audio track are prepared in advance with different tempos (e.g., 0.9x, 1.0x, 1.1x). During playback, the system simply selects from these pre-prepared versions rather than performing real-time tempo modification, thereby avoiding complex processing while still providing adaptive tempo control.
Solution Approach 2:
The system dynamically selects among multiple pre-formatted audio versions based on detected workout intensity or user preferences. The playback tempo is adjusted by switching between pre-rendered tracks with different tempo characteristics, enabling adaptive behavior without real-time signal processing complexity.
2Measurement precision
If multiple pre-formatted music versions are stored, then tempo matching accuracy is improved, but storage space is consumed
Solution Approach 1:
Instead of storing multiple complete versions of all music, the system stores a single master version and generates tempo variations on-demand or stores only essential metadata (tempo information) for each track. This allows precise tempo matching through selective playback or light processing without duplicating entire audio files.
Solution Approach 2:
The system creates lightweight copies or representations of audio data, such as storing only tempo metadata or compressed references to master files. When tempo adjustment is needed, the system retrieves the master file and applies minimal processing or selects from a small set of pre-generated variations, rather than storing multiple full-resolution versions.
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
The solution enhances user motivation and workout endurance by providing music that dynamically matches the user's exercise pace, improving the overall workout experience through synchronized audio output.
Implementation Method 1
an accelerometer disposed inside the housing of the media player and configured to measure the motion of the media player
Implementation Method 2
mixing programs may utilize a technique called phase vocoding, which is one of the more powerful methods of manipulating sounds in the frequency domain
Data Source
AI summary
The invention generally pertains to a hand-held computing device. More particularly, the invention pertains to a computing device that is capable of controlling the speed of the music so as to affect the mood and behavior of the user during an activity such as exercise. By way of example, the speed of the music can be controlled to match the pace of the activity (synching the speed of the music to the activity of the user) or alternatively it can be controlled to drive the pace of the activity (increasing or decreasing the speed of the music to encourage a greater or lower pace). One aspect of the invention relates to adjusting the tempo (or some other attribute) of the music being outputted from the computing device. By way of example, a songs tempo may be increased or decreased before or during playing. Another aspect of the invention relates to selecting music for outputting based on tempo (or some other attribute). For example, the computing device may only play songs having a particular tempo. Yet another aspect of the invention relates to both selecting music based on tempo and adjusting the tempo of the music.