System for filtering mechanical coupling from a microphone signal
US-11462230-B1 · Oct 4, 2022 · US
Method for suppressing vibration coupled signals in a microphone for flight recorders
US12185065B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12185065-B2 |
| Application number | US-202217898256-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 29, 2022 |
| Priority date | Aug 29, 2022 |
| Publication date | Dec 31, 2024 |
| Grant date | Dec 31, 2024 |
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Abstract
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An aircraft recorder system is provided in which a vibration sensor including at least one of a micro-electromechanical systems (MEMS) microphone and a MEMS accelerometer. The system further includes a cockpit voice recorder (CVR) and an active microphone. The active microphone and the vibration sensor each output signals to a signal processor including a subtractor configured to output, to the CVR, a signal that is a result of a subtraction of the signal from the vibration sensor from the signal from the active microphone.
First claim
Opening claim text (preview).
What is claimed is: 1. An aircraft recorder system comprising: a cockpit voice recorder (CVR); an active microphone; a vibration sensor communicatively co-mounted with the active microphone such that vibration sensed by the active microphone is sensed by the vibration sensor; a signal processor communicatively coupled to receive a signal sig A output from the active microphone and a signal sigB output from the vibration sensor and to transmit a signal Sigfinal to the CVR, wherein the signal processor comprises: a subtractor configured to output, to the CVR, the signal sig final as a result of a subtraction of the signal sigB from the signal sig A ; and wherein the signal processor further comprises a first bandpass filter disposed on the signal path between the active microphone and the digital subtractor and second bandpass filter disposed on a signal path between the vibration sensor and the digital subtractor. 2. The aircraft recorder system of claim 1 , wherein the vibration sensor comprises at least one of a micro-electromechanical systems (MEMS) microphone and a MEMS accelerometer. 3. The aircraft recorder system of claim 2 , wherein the vibration sensor comprises the MEMS microphone co-mounted with the active microphone such that a sensitive axis of the MEMs microphone is aligned with a sensitive axis of the active microphone. 4. The aircraft recorder system of claim 2 , wherein the vibration sensor comprises the MEMs accelerometer configured to output a signal corresponding to an axis aligned with a sensitive axis of the active microphone. 5. The aircraft recorder system of claim 1 , wherein the signal processor further comprises a digital/analog converter configured to convert a digital signal sig final , received from the subtractor, into an analog signal sig final , and to transmit the analog signal sig final to the CVR. 6. The aircraft recorder system of claim 1 , wherein the signal processor further comprises at least one adjustable delay disposed on one of a signal path between the active microphone and the digital subtractor and a signal path between the vibration sensor and the digital subtractor.
Assignees
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Classifications
Acoustic transducers and sound field adaptation in vehicles · CPC title
Synergistic effects of band splitting and sub-band processing · CPC title
Mems transducers or their use · CPC title
Special constructions of mouthpieces · CPC title
Noise filtering · CPC title
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Frequently asked questions
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- What does patent US12185065B2 cover?
- An aircraft recorder system is provided in which a vibration sensor including at least one of a micro-electromechanical systems (MEMS) microphone and a MEMS accelerometer. The system further includes a cockpit voice recorder (CVR) and an active microphone. The active microphone and the vibration sensor each output signals to a signal processor including a subtractor configured to output, to the…
- Who is the assignee on this patent?
- L3 Tech Inc, L3Harris Aviation Products Inc
- What technology area does this patent fall under?
- Primary CPC classification H04R3/002. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 31 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).