Multi-touch Piano Keyboard Sensor Array Expressivity
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Solution Overview
Problem
Traditional piano-style keyboards lack nuanced and flexible control over musical sounds, as they primarily rely on discrete note onset and release, with limited after-touch sensitivity and expressivity, especially in rapid passages and multi-dimensional control.
Innovation Solution
Integration of a plurality of touch sensors in an array on each keyboard key, electronically coupled to a processor, allowing for variable sound generation based on the number and location of sensors struck, enabling continuous and expressive pitch control, vibrato, and multi-finger gestures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional piano-style keyboards use discrete note onset and release control, then the keyboard structure remains simple, but the expressivity and control over musical sounds is limited
Solution Approach 1:
The patent divides each key surface into multiple discrete touch zones arranged in an array. Each zone can be independently detected by the sensor system, allowing different musical parameters to be controlled by different zones. This segmentation enables rich expressivity while maintaining a relatively simple overall keyboard structure.
Solution Approach 2:
The patent transitions from one-dimensional discrete key press detection to two-dimensional continuous touch position detection across the key surface. By adding the spatial dimension of touch location, the system achieves continuous control over multiple musical parameters simultaneously, greatly enhancing expressivity without requiring multiple separate controls.
2Adaptability or versatility
If after-touch sensitivity is added to control musical parameters, then expressivity is improved, but the key must be completely pressed before after-touch works, limiting control over articulation
Solution Approach 1:
The patent implements touch detection across the entire key surface from the moment of initial contact, rather than waiting for complete key depression. The sensor array detects touch position and pressure throughout the key press trajectory, enabling articulation control to begin at the start of the gesture and continue dynamically throughout the note attack.
3Adaptability or versatility
If multiple external knobs and wheels are added for continuous control, then control range is improved, but the immediacy and expressivity of control through the keyboard itself is lost
Solution Approach 1:
The patent makes the keyboard surface itself multi-functional by enabling it to control multiple musical parameters simultaneously through different touch zones and gestures. The same key surface that produces notes also provides continuous control over timbre, pitch, and other parameters, eliminating the need for separate external controls and maintaining direct tactile feedback.
Solution Approach 2:
The patent merges the note production function and the continuous control function into a single unified interface - the keyboard surface. By integrating multiple sensor arrays across the keys, the system combines discrete note triggering with continuous parameter control in one tactile interaction surface, restoring immediacy and expressivity.
4Adaptability or versatility
If a sensor array with multiple integrated sensors is integrated on each key, then multi-dimensional control and expressivity are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex mechanical multi-dimensional control mechanisms with electronic sensor arrays. Instead of mechanical levers, knobs, or sliders, the system uses capacitive or resistive touch sensors to detect finger position and pressure, converting physical gestures directly into electronic control signals. This substitution reduces mechanical complexity while enabling rich multi-dimensional control.
Data Source
AI summary
A musical keyboard touch sensor pad having a plurality of integrated sensors disposed in an array is disclosed. The plurality of integrated sensors represents a keyboard key. A processor is electronically coupled to the plurality of integrated sensors. The processor is programmed to receive signals from several of the plurality of integrated sensors and to generate a sound signal based on input from the several of the plurality of integrated sensors. The output is variable based on the number in the plurality and the location of the plurality in the array. An audio output device is electronically coupled to the processor to generate a sound based on the sound signal. A keyboard using a plurality of the sensor pads as well as a method of generating sounds from the keyboard are also disclosed.