Hands-Free Call Device Voice Pickup Angle Calibration
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Solution Overview
Problem
Hands-free call devices, such as smart watches, suffer from low call quality due to the collection of ambient noise and the transmission signal-to-noise ratio being influenced by the uncertain positioning of the device relative to the user's mouth, leading to privacy concerns as sound is not directed appropriately.
Innovation Solution
A method and apparatus that utilize a main microphone and auxiliary microphones to scan and calibrate the voice pickup angle, narrowing it to a more precise range by determining a second collection angle based on voice feature signals, and applying directional compensation to the loudspeaker array to improve signal quality and privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large voice protection angle is used in hands-free call mode, then the device can capture voice signals from uncertain positions relative to the user's mouth, but much ambient noise is collected and the transmission signal to noise ratio is reduced
Solution Approach 1:
The patent applies dynamic adjustment of the voice protection angle based on detected voice feature signal directions. The system initially uses a large collection angle to capture voice signals from uncertain positions, then dynamically narrows the angle to a second collection angle based on the scanned voice direction, thereby adapting the pickup pattern to the actual voice source location and reducing ambient noise interference
Solution Approach 2:
The system changes the collection angle parameter from a fixed large angle to a dynamically adjusted smaller angle. By scanning for voice feature signals and determining their directions, the system modifies the voice protection angle parameter to optimize the balance between voice capture coverage and noise rejection, improving the transmission signal to noise ratio
2Reliability
If sound is broadcast in all directions from the loudspeaker, then the user can hear the call clearly, but private information can be easily leaked to people nearby
Solution Approach 1:
The patent applies local quality by directing sound energy preferentially toward the user's location rather than broadcasting uniformly in all directions. By determining the voice feature signal direction and calibrating the loudspeaker array accordingly, the system creates a localized sound beam that maintains call audio clarity for the intended user while reducing sound exposure to surrounding areas, thereby protecting privacy information
Data Source
AI summary
The present invention discloses a method and an apparatus for improving the call quality of a hands-free call device, and a hands-free call device. The hands-free call device comprises a transmitter end composed of a main microphone and at least one auxiliary microphone. The method comprises: scanning within an initial first collection angle of a transmitter end; after a voice feature signal is scanned within the first collection angle, according to a direction of the voice feature signal, determining a second collection angle smaller than the first collection angle within the first collection angle; and calibrating the transmitter end to a direction determined by the second collection angle. In this method, voice pickup is conducted using a relatively small voice protection angle, so that the interference from ambient noise can be greatly reduced, to achieve the purpose of improving the transmission signal to noise ratio, thus the directivity of a voice in a hands-free call device during a call is more clear, which improves the call quality.