Arbitrary Signal Insertion in Live Acoustic Performances
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Solution Overview
Problem
Conventional methods struggle to insert arbitrary signals into acoustic sounds with changing rhythms, such as live performances at concert halls, where the rhythm cannot be predetermined.
Innovation Solution
An arbitrary signal insertion method synchronizes a first predetermined rhythm with the actual second rhythm played by a performer, allowing for precise insertion of signals at desired timings using MIDI data for confirmation and control of peripheral devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined rhythm is used for signal insertion, then signal insertion timing can be controlled, but the method cannot handle acoustic sounds with changing rhythms like live performances
Solution Approach 1:
The system dynamically adapts to changing rhythms by continuously monitoring the actual acoustic rhythm and adjusting the signal insertion timing accordingly. The rhythm detection unit tracks tempo changes in real-time, allowing the system to maintain precise signal insertion even when the underlying rhythm varies, thus resolving the contradiction between timing precision and adaptability to changing rhythms.
Solution Approach 2:
The system employs feedback mechanisms where the detected actual rhythm is fed back into the signal insertion control process. This allows the system to continuously adjust insertion timing based on the most recent rhythm information, ensuring both precision and adaptability to tempo changes during live performances.
2Adaptability or versatility
If signal insertion is performed in real-time during live performances, then adaptability to changing rhythms is achieved, but insertion timing precision becomes difficult to control
Solution Approach 1:
The system performs preliminary actions by pre-detecting and analyzing rhythm patterns before signal insertion occurs. The rhythm detection unit continuously monitors and stores rhythm information in advance, allowing the system to plan and execute signal insertions at precisely controlled timing points even during dynamic live performances.
Solution Approach 2:
The system maintains dynamic adaptation to rhythm changes while preserving timing precision through real-time rhythm tracking and adaptive timing adjustment. This allows the system to handle live performances with changing tempos while ensuring signals are inserted at the intended precise moments.
3Ease of manufacture
If conventional digital watermark techniques are used, then signal insertion into recorded music is achieved, but direct insertion into actually played acoustic sounds is not possible
Solution Approach 1:
The system replaces the mechanical recording and playback process with a direct acoustic analysis and synthesis approach. Instead of embedding signals into pre-recorded digital audio files, the system directly analyzes the acoustic waveform of live performances and inserts signals in the time domain, enabling ease of signal insertion while expanding applicability to live acoustic sounds.
Solution Approach 2:
The system introduces an intermediary rhythm detection and analysis process between the live acoustic sound and the signal insertion operation. This intermediary layer analyzes the acoustic waveform to detect rhythm patterns, which then guide the signal insertion process, making the system both easy to operate and adaptable to live performances.
Data Source
AI summary
An arbitrary signal insertion method and an arbitrary signal insertion system, capable of inserting a transmittable arbitrary signal (insertion information M) at a predetermined insertion timing into an acoustic sound played in real time. An insertion timing is previously associated with a predetermined time code with master rhythm information. An acoustic sound into which insertion information will be inserted is music sound generated by a real-time performance unit and is accompanied by a second rhythm. The insertion information is inserted into the music sound generated by the real-time performance unit at the insertion timing after the rhythm of master rhythm information and the rhythm of the music sound generated by the real-time performance unit are synchronized. The synchronization is achieved by a rhythm transmitter which notifies a player of a rhythm session musical instrument of the rhythm of the master rhythm information with sound or light.