Integrated Vehicle Microphone Capsule with Digital Bus Interface
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Solution Overview
Problem
Existing microphone arrangements in motor vehicles face challenges with scalability and cabling interference due to the need for extensive cabling from multiple microphones to a central processing unit, limiting the placement of microphones and compromising audio quality.
Innovation Solution
A microphone design that integrates a microphone membrane, driver circuit, and interface circuit within a single capsule, capable of converting the membrane signal into a digital bus signal for direct connection to a data bus, allowing multiple microphones to share a common bus line and reducing wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microphones are arranged in the vehicle interior with separate cabling to the central processing unit, then sound detection coverage is improved, but cabling complexity and interference increase
Solution Approach 1:
The patent combines multiple microphones and their associated cabling into a single integrated microphone unit. The microphone array, signal processing circuits, and connection interface are merged into one compact device that interfaces with the central processing unit through a single connection, eliminating the need for separate cabling from each microphone while maintaining multi-point sound detection capability.
Solution Approach 2:
The integrated microphone unit serves multiple functions: it performs sound detection at multiple points within the vehicle, processes signals from multiple microphone capsules, and provides a single unified interface to the central processing unit. This multi-functional design replaces what would traditionally require separate microphones, signal conditioning circuits, and cabling for each microphone.
2Ease of manufacture
If microphone capsules are soldered onto printed circuit boards for directional detection, then integration is improved, but placement flexibility is reduced
Solution Approach 1:
The patent segments the microphone system into a self-contained modular unit that can be independently manufactured and then installed in various locations. The microphone capsule array, signal processing circuits, and connection interface are divided as a complete functional module, allowing it to be placed in different vehicle positions (dashboard, door panels, roof liner) without requiring printed circuit board infrastructure at each location.
3Measurement precision
If microphone devices with beamforming capability are distributed throughout the vehicle, then sound detection precision is improved, but device size and installation space increase
Solution Approach 1:
The patent merges multiple microphone capsules, signal processing circuits for beamforming, and control logic into a single compact integrated unit. This consolidation achieves the sound detection precision of distributed microphones while occupying minimal installation space, as all functional elements are combined in one location rather than distributed throughout the vehicle interior.
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
This design enables efficient transmission of audio signals with reduced wiring, allows for flexible microphone placement, and maintains high audio quality by simplifying the cabling and enabling scalable microphone arrangements within the vehicle.
Implementation Method 1
a microphone membrane (32) is arranged in a microphone capsule (38) in a known manner. The microphone capsule has at least one sound entry opening (34) through which airborne sound can reach the microphone membrane (32) from outside the microphone capsule and set it in motion
Implementation Method 2
A driver circuit is also arranged in the microphone capsule. A driver circuit is to be understood here as an electronic circuit by means of which an electrical membrane signal is generated in a manner known per se as a function of the movement of the microphone membrane
Data Source
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AI summary
The invention relates to a microphone (18) for sound detection in a motor vehicle (10), having a microphone capsule (32), which has at least one sound inlet opening (34), a microphone diaphragm arranged in the microphone capsule (32) and a driver circuit (38) arranged in the microphone capsule (32) for generating an individual electrical diaphragm signal depending on a movement of the microphone diaphragm. Connection contacts (42), which are arranged such that they can be reached from outside the microphone capsule (32) and are connected to the microphone capsule (32) emit an electrical microphone signal. The problem addressed by the invention is that of providing a microphone arrangement for sound detection in a motor vehicle, which requires little installation space. To this end, an interface circuit (40) is likewise arranged in the microphone capsule (32) and is designed to convert the individual diaphragm signal of the driver circuit (38) directly into a digital bus signal according to a predefined bus standard and to output the bus signal as the microphone signal via the connection contacts (42) to a data bus (28).