Electrostatic Headphones with Integrated High Voltage Amplifier
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Solution Overview
Problem
Existing headphones with electrostatic transducers are not capable of wireless, cable-free operation while maintaining high fidelity sound reproduction and full bandwidth frequency response.
Innovation Solution
An electrostatic headphone design incorporating a pair of ear cup assemblies, each with an integrated high voltage amplifier and high voltage power supply, along with wireless communication circuitry to receive audio signals, enabling wireless operation without compromising sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrostatic transducers are used in headphones, then high fidelity sound reproduction and full bandwidth frequency response are achieved, but high voltages are required for biasing and audio signals
Solution Approach 1:
The patent divides the power supply system into separate high voltage power supplies integrated into each ear cup assembly, independent of the source device. This segmentation allows the headphones to operate autonomously with electrostatic transducers without requiring high voltage from external devices, resolving the contradiction between achieving high fidelity sound reproduction and managing high voltage power requirements.
2Ease of operation
If cables are used for power and signal transmission, then high voltage power and audio signals can be delivered to electrostatic transducers, but wireless operation is prevented
Solution Approach 1:
The patent integrates both high voltage power supplies and wireless communication circuitry directly into the ear cup assemblies, separating these functions from the source device. This allows the headphones to receive audio signals wirelessly while maintaining the high voltage power needed for electrostatic transducers, thus achieving both cable-free operation and high fidelity sound reproduction simultaneously.
Solution Approach 2:
The patent introduces wireless communication circuitry as an intermediary to transmit audio signals from the source device to the ear cup assemblies without physical cables. This intermediary enables wireless operation while maintaining signal quality, and when combined with integrated high voltage power supplies, ensures reliable high fidelity sound reproduction without cables.
3Adaptability or versatility
If high voltage amplifier and power supply are integrated into each ear cup, then wireless operation becomes possible, but device complexity increases
Solution Approach 1:
The patent integrates the high voltage amplifier and power supply into each ear cup assembly, segmenting these complex functions from the source device and distributing them across the headphone units. While this increases the complexity of individual ear cups, it enables wireless operation and autonomous high voltage generation, making the overall system more adaptable and versatile.
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 solution allows for high fidelity sound reproduction and full bandwidth frequency response during wireless operation, addressing the limitations of existing electrostatic headphones that require cables for power and signal transmission.
Implementation Method 1
an electrostatic transducer for sound reproduction that includes a tensioned conductive low-mass diaphragm positioned between a pair of conductive stator plates... When equal magnitude opposite-phase audio signals are applied to the stator plates, a net force imbalance may be created over the diaphragm, which displaces the diaphragm. In turn, the air adjacent to the diaphragm may be displaced to create sound corresponding to the audio signals.
Data Source
AI summary
An electrostatic headphone is provided, comprising a first ear cup assembly, a second ear cup assembly, and a headband assembly coupled to each of the first ear cup assembly and the second ear cup assembly. Each ear cup assembly comprises an electrostatic transducer, a high voltage amplifier electrically coupled to the transducer, and a high voltage power supply electrically coupled to the high voltage amplifier. At least one of the ear cup assemblies further comprises a power source for providing electric power to the high voltage power supply included in the at least one ear cup assembly. In some cases, one or more of the ear cup assemblies further comprises a wireless communication module for receiving audio signals from an audio source.