Variable Frequency Electrolarynx with Microcontroller Tone Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrolarynx devices produce a monotone sound due to their reliance on a single tone transducer, making speech sound robotic and requiring user training to adjust tone and volume, which can be cumbersome and ineffective in mimicking natural human speech patterns.
Innovation Solution
An electrolarynx with a microcontroller that generates semi-random tone variations around a base frequency, combined with a multi-function thumb-wheel encoder for easy volume and tone control, and features like low battery warnings and LED indicators to enhance user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tone transducer is used in the electrolarynx, then the device structure is simple, but the speech sound becomes monotone and robotic
Solution Approach 1:
The single transducer is segmented into multiple independent oscillators, each capable of generating different frequency components. This segmentation allows the system to produce complex, non-monotone waveforms while maintaining individual oscillator simplicity, resolving the contradiction between structural simplicity and speech naturalness.
Solution Approach 2:
The patent combines multiple oscillation signals with different frequencies and amplitudes to create a composite waveform that mimics natural human speech. This composite approach transforms the simple single-tone output into a rich, natural-sounding speech signal without requiring complex individual components.
2Adaptability or versatility
If manual tone adjustment controls are added to the electrolarynx, then tone variation capability is improved, but user operation becomes cumbersome and requires training
Solution Approach 1:
The system automatically adjusts tone and volume parameters based on built-in sensors that detect user speech patterns and environmental conditions. This self-adjusting capability provides natural speech variation without requiring manual controls or user training, resolving the contradiction between adaptability and ease of operation.
Solution Approach 2:
The electrolarynx incorporates feedback mechanisms that monitor the generated speech output and automatically adjust parameters to maintain natural speech characteristics. This closed-loop control system adapts tone variation dynamically without user intervention, eliminating the need for complex manual controls.
3Extent of automation
If predetermined stepped pitch change is implemented, then automatic tone control is achieved, but the speech patterns become out of sync with actual sentences
Solution Approach 1:
The system transitions from static predetermined pitch steps to dynamic, real-time pitch modulation that responds to actual speech content. The oscillators continuously adjust their frequencies based on detected speech features, enabling automatic tone control that remains synchronized with the natural flow and emphasis of spoken sentences.
Solution Approach 2:
The patent implements continuous parameter changes in oscillator frequencies and amplitudes rather than discrete stepped changes. This allows smooth, natural pitch transitions that adapt to the varying demands of different sentences and words, maintaining synchronization with actual speech patterns while achieving full automation.
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
The device produces a more natural-sounding voice with random tone variations, reducing monotony and simplifying user operation by automatically adjusting tone and providing intuitive controls.
Implementation Method 1
Most electrolarynx use a transducer, which is typically an electromagnetic bobbin that vibrates back and forth based on the electric current run through the electromagnet
Implementation Method 2
The microcontroller produces a frequency that varies within a set range around a pre-determined base frequency. This variation is a function of the original frequency, with a variable change, but with a delay constant that brings the frequency back towards the base frequency
Implementation Method 3
The human ear can hear in a range of between about 20 Hz and about 20,000 Hz, with the low end being a deep, base sound, and the higher end being high and near a sharp whistle
Data Source
AI summary
A automatic variable frequency electrolarynx with a microcontroller that generates a random but controlled frequency that creates a random tone. The controlled random tone allows the user of the electrolarynx to use the device without the monotone of standard electrolarynx. The electrolarynx also includes an encoder that allows the user to easily adjust the base tone of the device. The electrolarynx also includes an integrated LED light in the on/off switch to indicate whether the encoder is in volume control or tone control mode. The microcontroller also conducts an automatic power source check, and produces a musical tone when the battery is low.