Sound Source Matching Control for Natural Performance Audio

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Solution Overview

Problem

The coexistence of performance sound and recorded sound with similar content can create an unnatural musical impression and obstruct the user's performance, particularly when the sound generation sources are the same, leading to interference between the two.

Innovation Solution

A sound processing device that includes a controller and memory to reproduce a recorded signal and specify the type of sound generation source of a performance sound, reducing the sound volume of the recorded signal when the sources match, using a sound analysis unit to identify the type of sound generation source and a reproduction control unit to adjust the volume accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the recorded sound is reproduced at full volume, then the quality of the recorded sound reproduction is improved, but the performance sound is obstructed and the musical naturalness deteriorates

Engineering Contradiction:

Improvequality of recorded sound reproductionVSAvoidobstruction to performance sound

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system applies different volume levels to different sound sources locally. When the sound source type matches (e.g., both are piano), the recorded sound volume is reduced specifically for that frequency range and time period, while other sounds maintain their original volume. This localized adjustment resolves the contradiction by protecting the performance sound in specific contexts while maintaining overall reproduction quality.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The recorded sound volume is dynamically adjusted based on real-time analysis of the performance sound. The system continuously monitors the performance sound, identifies its source type, and adapts the recorded sound volume accordingly. This dynamic adjustment allows the system to maintain high reproduction quality when needed while reducing obstruction during performance periods.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the recorded sound and performance sound coexist at similar volumes, then the completeness of the audio output is improved, but the musical naturalness deteriorates due to interference

Engineering Contradiction:

Improvecompleteness of audio outputVSAvoidmusical unnaturalness and interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system uses feedback from sound source identification to control recorded sound reproduction. The sound source identification unit analyzes the performance sound and provides feedback to the reproduction control unit, which adjusts the recorded sound volume based on this information. This feedback loop ensures that recorded and performance sounds coexist harmoniously by preventing interference while maintaining audio completeness.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the volume parameter of the recorded sound based on the identified sound source type. When the performance sound source matches the recorded sound source type, the system modifies the volume parameter of the recorded sound to an appropriate level, preventing interference and maintaining musical naturalness while preserving the completeness of the audio output.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the sound volume of the recorded signal is reduced, then the performance sound becomes more prominent and natural, but the quality of recorded sound reproduction deteriorates

Engineering Contradiction:

Improvenaturalness of performance soundVSAvoidquality of recorded sound reproduction

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system applies periodic volume reduction to the recorded sound during performance periods. By identifying performance periods through sound source analysis and applying volume reduction specifically during these periods, the system maintains high reproduction quality during non-performance periods while enhancing performance sound naturalness during performance periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS10298192B2Sound processing device and sound processing method

Publication Date: 2019.05.21 YAMAHA CORP

AI summary

A recorded signal representing a recorded sound generated by a sound generation source is reproduced. A type of a sound generation source of a performance sound represented by a performance signal is specified. A sound volume of the recorded signal is reduced in a case where the sound generation source of the recorded signal corresponds to the specified type of the sound generation source.