Piano Interface Device MIDI Volume Control
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Solution Overview
Problem
Existing player mechanisms for acoustic instruments, such as player pianos, require dedicated control units with integrated MIDI functionality, limiting compatibility with non-MIDI devices like off-the-shelf media players, which cannot adjust playback characteristics effectively.
Innovation Solution
A Piano Interface Device (PID) that demodulates MIDI data streams from audio signals, measures signal amplitude, and adjusts MIDI volume levels by modifying velocity or injecting control messages, enabling communication between non-MIDI controllers and MIDI-compatible instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated control unit with integrated MIDI functionality is used, then MIDI compatibility and playback control are improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces an intermediary device that converts audio signals containing embedded MIDI data into control signals for the player mechanism. This mediator allows non-MIDI devices to control MIDI-compatible instruments without requiring the instrument to have built-in MIDI functionality, thus resolving the contradiction between MIDI compatibility and device complexity
Solution Approach 2:
The patent replaces the traditional mechanical control system (dedicated control unit with MIDI interface) with an audio signal-based control system. By embedding MIDI control information in audio signals and using audio processing to extract and act on this information, the system eliminates the need for complex dedicated MIDI control hardware
2Reliability
If proprietary hardware interfaces are used, then communication reliability is improved, but adaptability to different devices deteriorates
Solution Approach 1:
The patent implements a universal control interface that can work with both MIDI-compatible and non-MIDI devices through a common audio signal medium. The system can process audio signals from various sources (media players, computers, other instruments) and convert them into appropriate control signals, making the player mechanism compatible with diverse devices without requiring proprietary interfaces
Solution Approach 2:
The audio signal processing system acts as a universal intermediary that translates between different control sources and the player mechanism, enabling reliable communication across different device types without requiring device-specific proprietary interfaces
3Adaptability or versatility
If external control devices are added, then functionality is improved, but device complexity increases
Solution Approach 1:
The patent combines the control functionality directly into the audio signal transmission path. By embedding control information within the audio signal itself and using the existing audio processing chain for control functions, the system adds functionality without requiring separate external control devices or increasing overall system complexity
Solution Approach 2:
The audio processing system is designed to handle both audio reproduction and control signal extraction through the same hardware path, making the system multi-functional without requiring additional dedicated control hardware
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
Enables control of MIDI-compatible instruments using off-the-shelf media players, allowing for dynamic adjustment of note velocity and volume based on audio signal amplitude, enhancing playback flexibility and compatibility without the need for proprietary hardware.
Implementation Method 1
a demodulator configured to demodulate a MIDI data stream from an audio signal input from the controller
Implementation Method 2
a signal monitor configured to measure the amplitude of at least a portion of the audio signal
Data Source
AI summary
An apparatus and method of controlling note velocity within an electronically controlled player piano in response to the analog characteristics (level, strength, amplitude, etc.) of a received audio signal encoded with a MIDI (or similar) note stream. The invention allows conventional audio playback devices to be utilized as a source for MIDI information which drives the actuation of the keys of the player piano.