Pre-stage amplification circuit, electret microphone and vehicle
By introducing a combination of time-division duplex filter, high-pass filter, emitter follower and ferrite bead filter into the electret microphone, the problems of TDD interference and low-frequency noise in vehicles are solved, achieving high-performance and low-cost signal transmission that meets certification requirements.
CN224356267UActive Publication Date: 2026-06-12BEI DOU ZHI LIAN KE JI YOU XIAN GONG SI +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEI DOU ZHI LIAN KE JI YOU XIAN GONG SI
- Filing Date
- 2025-07-01
- Publication Date
- 2026-06-12
Smart Images
Figure CN224356267U_ABST
Abstract
The application relates to the technical field of microphones, in particular to a pre-stage amplification circuit, an electret microphone and a vehicle. The pre-stage amplification circuit comprises one end of a time division duplex filter used for connecting the electret microphone, and the other end of the time division duplex filter used for connecting the base of an emitter follower through a high-pass filter; the emitter of the emitter follower is used for connecting a post-stage processing unit through a magnetic bead filter; the time division duplex filter is used for performing first filtering and second filtering on original audio signals collected by the electret microphone to obtain first audio signals; the high-pass filter is used for performing third filtering on the first audio signals to obtain second audio signals; and the emitter follower sends the amplified second audio signals to the post-stage processing unit through the magnetic bead filter. The application adopts a common emitter follower to amplify signals, has low cost, can eliminate TDD interference, and has high performance.
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