Loop Recording Accompaniment Muting for Phase Shift Prevention
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Solution Overview
Problem
Existing electronic musical instruments face issues with sound quality when using loop recording, as accompaniment sounds repeated in subsequent rounds can unintentionally amplify, leading to timbres with shifted phases and degraded sound quality.
Innovation Solution
An electronic musical instrument that controls the storage and output of accompaniment sounds to prevent overdubbing, ensuring they are only recorded and played back once per loop segment, using a configuration that manages sound volume levels to maintain quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If loop recording is performed with repeated accompaniment sounds in subsequent rounds, then multitrack recording capability is utilized, but sound quality deteriorates due to waveform amplification and phase shifts
Solution Approach 1:
The patent extracts the harmful repeated accompaniment sounds from the loop recording process. Specifically, it separates the accompaniment track from the performance track, allowing the accompaniment to be recorded only once while performance sounds can be overdubbed in subsequent rounds without causing waveform amplification or phase shifts
Solution Approach 2:
The patent segments the recording into distinct tracks: an accompaniment track that is recorded once and then muted in subsequent rounds, and performance tracks that can be overdubbed. This segmentation prevents the harmful interaction of repeated accompaniment sounds while preserving the multitrack recording capability
2Duration of action of stationary object
If automatic accompaniment is repeated in loop recording, then loop functionality is achieved, but harmful waveform amplification occurs
Solution Approach 1:
The patent applies preliminary anti-action by muting the accompaniment track before it can be repeated in subsequent loop rounds. The system proactively prevents the harmful waveform amplification by stopping the accompaniment output in advance, while still allowing the loop functionality to continue for recording performance sounds
3Duration of action of stationary object
If accompaniment sounds are output in subsequent loop rounds, then continuous accompaniment is maintained, but timbre quality shifts and degrades
Solution Approach 1:
The patent records the accompaniment sounds in advance during the first loop round, storing them in the buffer memory. This preliminary action allows the accompaniment to be preserved in high quality without needing to be repeatedly generated, thus preventing timbre quality shifts while maintaining continuous playback
Data Source
AI summary
Provided are a method, electronic musical instrument, and computer storage device for mixing automatic accompaniment input and musical device input during a loop recording. During a first loop recording, automatic accompaniment information is generated from a storage device having patterns of automatic accompaniment information. First musical device input is received from at least one coupled musical device. The first musical device input and the automatic accompaniment input based on the generated automatic accompaniment information are mixed to produce a first mixed output. The first mixed output in a recording memory. During a second loop recording following the first loop recording, the first mixed output is outputted from the recording memory. Second musical device input from the at least one coupled musical device is received while outputting the first mixed output. The received second musical device input and the first mixed output are mixed to produce second mixed output. The second mixed output is stored in the recording memory.