Microphone Unit Carrier Plate Perforations
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Solution Overview
Problem
Miniature microphones have limitations in frequency response, dynamic range, directional characteristics, and noise performance, making them unsuitable for high-quality audio applications.
Innovation Solution
A microphone unit comprising multiple miniature microphones arranged on a carrier plate with perforation regions for acoustic impedance, resonators, and summing units to enhance frequency response and directional characteristics, and time delay units to manage noise and solid-borne sound sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If miniature microphones are used, then device size is reduced, but frequency response and dynamic range deteriorate
Solution Approach 1:
The patent divides a single microphone function into multiple miniature microphones arranged in an array on a carrier plate. By segmenting the microphone system into multiple elements, the patent achieves improved frequency response and directional characteristics while maintaining the compact size advantage of miniature microphones.
Solution Approach 2:
The patent combines multiple miniature microphones into a unified microphone unit with a common carrier plate and integrated electronic components. This merging of multiple elements achieves the performance of larger microphones while retaining the compact form factor, resolving the contradiction between size and performance.
2Measurement precision
If multiple miniature microphones are arranged on a carrier plate, then frequency response and directional characteristics are improved, but device complexity increases
Solution Approach 1:
The carrier plate serves multiple functions simultaneously: it provides mechanical support for the miniature microphones, establishes acoustic coupling between elements, provides mounting for electronic components, and defines the overall geometric arrangement. This multi-functionality reduces the need for separate components, thereby managing complexity.
Solution Approach 2:
The patent integrates electronic components directly onto the carrier plate, nesting them within the same structure that holds the miniature microphones. This nested arrangement consolidates multiple subsystems into a compact integrated unit, managing complexity through spatial consolidation.
3Measurement precision
If acoustic impedance is introduced in the perforation region, then directional control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses a perforated carrier plate where the perforations provide acoustic impedance control. The porous/perforated structure enables directional control through acoustic filtering while using standard manufacturing techniques for creating arrays of small holes, managing the precision requirements through established fabrication methods.
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 improved frequency response, directional control, and noise reduction, enabling the use of miniature microphones in high-quality audio applications by emulating dynamic, electrostatic, or electret microphone properties.
Implementation Method 1
The carrier unit has a perforation region in which there is provided an acoustic impedance
Implementation Method 2
the microphone unit has at least one resonator in front of the front and/or rear side of the carrier unit. The at least one resonator is acoustically coupled to the microphone inlets
Data Source
AI summary
There is provided a microphone unit having a plurality of miniature microphones for respectively recording audio signals and a carrier unit. The miniature microphones can be arranged on a side of the carrier unit.