Acoustic Device Tempo Synchronization via Segmented Playback Control
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Solution Overview
Problem
When switching between music pieces, the discontinuity in BPM (beats per minute) leads to an uncomfortable impression for users, and adjusting BPM to align tempos can cause divergence between the original music and playback sound, especially affecting the melody line.
Innovation Solution
An acoustic device that detects the tempo of both music pieces and uses a playback controller to gradually synchronize and align the tempo of specific parts, allowing seamless switching by synchronizing the drum sound parts through cut-out and cut-in, and non-drum sound parts through fade-out and fade-in, without changing their original tempos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If BPM is changed to align tempos of music pieces, then tempo continuity is improved, but divergence between original music and playback sound becomes eminent
Solution Approach 1:
The music piece is divided into multiple parts (first part, second part, etc.), and tempo adjustment is applied selectively to specific parts rather than the entire piece. This allows tempo alignment for continuity while preserving original playback characteristics for other sections, resolving the contradiction between tempo continuity and playback accuracy.
Solution Approach 2:
Different parts of the music piece are treated with different quality settings - some parts undergo tempo adjustment while others maintain original tempo. This local differentiation allows tempo alignment where needed while preserving original sound quality in other regions, addressing the contradiction between continuity and accuracy.
2Adaptability or versatility
If cross fader is used to switch music pieces, then music switching capability is improved, but skillful operation is required for natural switching
Solution Approach 1:
The system automatically performs tempo detection, part separation, and synchronized playback without requiring manual intervention. The automatic mixing function handles the switching process autonomously, eliminating the need for skillful cross fader operation while maintaining music switching capability.
Solution Approach 2:
The system pre-processes music pieces by detecting tempos, separating parts, and preparing synchronized playback data before the actual switching operation. This preliminary preparation enables automatic, natural-sounding transitions without requiring user skill during the actual mixing process.
3Stability of the object's composition
If tempo is gradually changed to synchronize music pieces, then tempo alignment is improved, but divergence from original tempo occurs
Solution Approach 1:
The music piece is divided into multiple parts, allowing tempo adjustment to be applied selectively to specific segments (e.g., first part) while other parts maintain original tempo. This segmentation enables synchronization where needed while preserving original tempo fidelity in other sections.
Solution Approach 2:
Instead of applying tempo adjustment to the entire music piece, the system applies partial action only to specific parts that require synchronization. This partial adjustment achieves tempo alignment for those segments while avoiding excessive tempo modification that would cause divergence from the original tempo.
Data Source
AI summary
An acoustic device for mixing at least two music pieces including first and second music pieces is provided, the acoustic device including: a detector for detecting tempos of the first and second music pieces each including a plurality of parts including a first part; and a playback controller for gradually changing a tempo of the first part of the first music piece or the second music piece and synchronizing the tempo of the first part of the first music piece and the tempo of the first part of the second music piece at a mixing start time or after an elapse of a predetermined time from the mixing start time.