Low-noise microphone
A double membraning system in microphone production improves sound absorption, achieving a 21 dBA noise reduction with minimal current consumption, addressing the challenge of noise levels in ¼ inch microphones.
Patent Information
- Application Number
- DE202023002931
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2023-08-29
- Publication Date
- 2025-05-08
- Estimated Expiration
- 2033-08-31
AI Technical Summary
Existing microphones, particularly those with a ¼ inch diameter, face challenges in achieving a replacement noise level below 24 dBA while maintaining full functionality with minimal current consumption.
Implementing a double membraning system in the micromechanical production of microphones for improved sound absorption, which enhances the signal-to-noise ratio, allowing for a replacement noise level of 21 dBA with minimal current consumption.
The double membraning system achieves a noise reduction to 21 dBA while maintaining full functionality and maximum output control with minimal current consumption.
Smart Images
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Abstract
Description
[0001] It is known that each microphone influences the sound field to be recorded more or less depending on its dimensions.
[0002] To minimize this influence, small microphones, for example with a diameter of ¼ inch or even less, are preferred, especially for measurement purposes.
[0003] So far, the best equivalent noise levels of approximately 24 dBA have been achieved with constant current powered ¼ inch measurement microphones
[0004] Every condenser microphone requires a supply current for the internal circuitry, the level of which determines the microphone's controllability.
[0005] The object of the invention is to achieve an equivalent noise level significantly below 24 dBA, especially for ¼ inch measurement microphones, even with the smallest possible supply current of the standardized constant current supply and to ensure full functionality, in particular also the maximum control.
[0006] According to the invention, the solution consists in operating the microphone with a dual-diaphragm system from micromechanical manufacturing for sound recording, because each dual-diaphragm system improves the ratio of useful sound to background noise. The invention enables the construction of measurement microphones with a small diameter and low noise. This allows for an equivalent noise level of only 21 dBA using the smallest possible current of the standardized constant current supply, while maintaining this level across the entire control range, i.e., up to the maximum level.
[0007] The circuit structure of the measuring microphone is shown in the block diagram: List of reference symbols 1 double diaphragm microphone 2 differential stages 3 filters 4 Transformation Stage 5 Measuring device with constant current supply source
Claims
[1] Measuring microphone with constant current supply, characterized in that a double diaphragm system is used as the sound pickup. [2] Measuring microphone according to claim 1, characterized in that the double diaphragm system used is one made of micromechanical manufacture [3] Measuring microphone according to claim 2, characterized in that it is operated as a ¼ inch microphone with the smallest possible supply current of the standardized constant current supply. [4] Measuring microphone according to claim 2, characterized by an equivalent noise level of 21 dBA over the entire control range up to 130 dBA.