Directional Sound Processing for Video Recording Interference

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Solution Overview

Problem

Existing electronic devices struggle with interference signals during video recording, resulting in low-quality sound due to the collection of unwanted sound signals and ambient noise, which are not addressed by current sound processing methods.

Innovation Solution

The method involves processing sound signals by reducing the energy of interference signals outside the camera's field of view and applying gain adjustments based on the probability of the sound being within the target orientation, thereby enhancing the signal-to-noise ratio and improving sound quality during video recording.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the electronic device collects sound signals from all directions during video recording, then the sound coverage is comprehensive, but interference signals and ambient noise increase, reducing sound quality

Engineering Contradiction:

Improvesound coverageVSAvoidinterference signals

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by making the sound collection directional rather than omnidirectional. The microphone system is configured to preferentially collect sounds from the front direction (where the camera is facing) while suppressing sounds from other directions. This creates a spatially selective sound collection pattern that matches the visual field of the camera, ensuring that sound quality is improved by reducing interference from directions outside the camera's field of view.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of collecting all sounds equally and then trying to filter out interference, the patent inverts the approach by pre-processing the sound collection to emphasize the desired direction (front) and suppress unwanted directions (back and sides). The sound processing algorithm inverts the traditional omnidirectional approach by applying directional gain adjustments that amplify front-facing sounds and attenuate sounds from other directions, thereby reducing interference before it becomes a problem.

Inventive Principle:

Principle #13The other way round (Inversion)

2Loss of information

If the electronic device collects sounds from all directions, then no important sound is missed, but the clarity of the target sound decreases due to mixed interference

Engineering Contradiction:

Improvesound information completenessVSAvoidsound source identification accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the sound collection space into different directional zones (front, back, sides) and applies different processing gains to each zone. By dividing the 360-degree sound environment into directional segments, the system can selectively enhance sounds from the target direction while suppressing sounds from non-target directions, thereby improving both the completeness of relevant sound information and the accuracy of sound source identification.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If traditional sound processing methods are used, then the processing is simple, but the sound quality and signal-to-noise ratio remain low

Engineering Contradiction:

Improveprocessing complexityVSAvoidsound quality

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the gain parameters of sound signals based on their directional characteristics. The system calculates the probability that a sound signal originates from the front direction and uses this probability to adjust the gain accordingly. Sounds with high probability of being from the front direction receive higher gain, while sounds with low probability receive lower gain or are suppressed. This parameter-based approach improves sound quality and signal-to-noise ratio without requiring complex hardware modifications.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4280211B1Sound signal processing method and electronic device

Publication Date: 2025.09.17 BEIJING HONOR DEVICE CO LTD

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AI summary

Embodiments of this application provide a sound signal processing method and an electronic device, which can reduce an interference sound signal in a sound during video recording and improve quality of a sound signal during the video recording. The method is applied to an electronic device. The method includes: acquiring, by the electronic device, a first sound signal; the first sound signal being a sound signal during video recording; processing, by the electronic device, the first sound signal to obtain a second sound signal; and outputting, by the electronic device, the second sound signal when playing back a recorded video file. Energy of a sound signal in the second sound signal in a non-target orientation is lower than energy of a sound signal in the first sound signal in the non-target orientation. The non-target orientation is an orientation outside a field of view range of a camera during video recording.