Method, vehicle and medium for preventing popping sound from being generated by active noise reduction of engine
By detecting abnormal points in the engine active noise reduction system and calculating alternative signals, the popping problem caused by the speaker's calculation signal jump is solved, and the stability and effect of noise control in the car is achieved.
CN119767225APending Publication Date: 2025-04-04华研慧声(苏州)电子科技有限公司
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Patent Information
- Application Number
- CN202411948298.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-04
AI Technical Summary
Technical Problem
When the engine's active noise reduction system changes in the operating conditions in the car, it is easy to cause the speaker's calculation signal to jump, resulting in a sound explosion in the car (POP sound), affecting the noise reduction effect.
Method used
By initializing parameters, including sampling frequency and thresholds for abnormal point detection, the speaker calculates the signal based on the LMS algorithm, and when an abnormal point is detected, the replacement signal is calculated to replace the abnormal point to ensure that the signal is continuously slippery.
Benefits of technology
It effectively prevents the engine's active noise reduction system from producing a burst sound, ensuring the stability and effect of noise control in the car.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention discloses a method, a car and a medium for preventing engine active noise reduction from generating popping sound. The method includes initialization parameters, and the parameters include sampling frequency, a threshold multiplier for detecting abnormal points, the size of a first buffer zone and the size of a second buffer zone. Based on the LMS algorithm, a loudspeaker calculation signal y(n) at the nth moment is calculated according to the engine speed. The overall variance value of the first buffer zone is counted and the abnormal point monitoring threshold θ is calculated. The difference Δy between the loudspeaker calculation signal y(n) and the actual driving signal y'(n‑1) of the loudspeaker is compared with the abnormal point monitoring threshold θ to perform abnormal point determination. When it is an abnormal point, a substitute signal at the abnormal point is calculated. The substitute signal is output to the loudspeaker as the actual driving signal at the nth moment, and the substitute signal is stored in the first buffer zone and the second buffer zone. The abnormal signal point calculated by the LMS algorithm can be found, and the signal of the abnormal point can be replaced to avoid the generation of popping sound.
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