Shotgun Microphone Spring Mounting for Vibration Isolation
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Solution Overview
Problem
Shotgun microphones face challenges in achieving effective structure-borne sound isolation while maintaining a compact design, as existing solutions often result in bulky structures due to the need for external suspension means.
Innovation Solution
A shotgun microphone unit with a housing, microphone capsule, and shotgun tube featuring a spring element mounting system that differentiates between axial and radial directions for mounting the shotgun tube, providing softer axial mounting to minimize interference and using the available assembly space efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If external suspension means are used for structure-borne sound isolation, then structure-borne sound isolation is improved, but device volume increases and becomes bulky
Solution Approach 1:
The spring element is integrated within the housing structure, nesting the suspension means inside the existing device boundaries rather than adding external components. The spring element is arranged inside the housing to suspend the shotgun tube assembly, achieving structure-borne sound isolation without increasing external device volume.
Solution Approach 2:
The spring element provides differential suspension characteristics in different spatial dimensions: softer mounting in the axial direction (longitudinal axis of shotgun tube) for better structure-borne sound isolation, and firmer mounting in radial directions for stability. This dimensional differentiation resolves the contradiction by optimizing isolation performance along the critical acoustic path while maintaining compact overall dimensions.
2Object-affected harmful factors
If softer mounting is provided in axial direction for structure-borne sound isolation, then acoustic disturbance is reduced, but mounting stability may be compromised
Solution Approach 1:
The spring element is designed with asymmetric stiffness characteristics: softer in the axial direction to minimize acoustic disturbance transmission to the microphone capsule, and firmer in radial directions to maintain mounting stability and prevent excessive movement. This asymmetric design resolves the contradiction between isolation performance and stability.
Solution Approach 2:
Different portions of the mounting system exhibit different mechanical properties tailored to local requirements: the axial portion uses softer spring characteristics for acoustic isolation, while radial portions use firmer characteristics for stability. This localized differentiation of mechanical properties resolves the contradiction between reduced acoustic disturbance and maintained mounting stability.
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 achieves improved structure-borne sound isolation with reduced assembly space, minimizing acoustic disturbances and maintaining directional accuracy by decoupling interference signals effectively, while ensuring the microphone capsule remains focused on the main acoustic lobe.
Implementation Method 1
a first mounting unit having a first spring and a second mounting unit having a second spring... provided between the shotgun tube and the microphone holder in order to be able to provide for structure-borne sound isolation
Implementation Method 2
elements of materials which provide for resilient suspension, but in that respect at the same time exert a marked damping effect on the movements
Data Source
AI summary
A shotgun microphone unit which includes a housing, a microphone capsule, a shotgun tube having a longitudinal axis, and a shotgun mounting for mounting the shotgun tube with the microphone capsule within the housing. The shotgun mounting has an axial and a radial mounting, wherein the axial mounting is softer than the radial mounting.