Wireless Headset Echo Control via Phase Inversion
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Solution Overview
Problem
Conventional wireless headsets with embedded microphones face issues of acoustic echo due to close proximity with speakers, ambient noise pickup, and low signal-to-noise ratio, affecting communication quality.
Innovation Solution
A wireless communication system with two separate units, each containing a speaker and an acoustic sensor within the housing, coupled with wireless electronic circuitry for echo control and noise cancellation, utilizing phase inversion and digital filtering to suppress echoes and ambient noise, and a beamformer to enhance speech signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the microphone is embedded into the housing of the headset, then the appearance is improved and mechanical durability is enhanced, but acoustic echo is generated due to close proximity between the microphone and speaker
Solution Approach 1:
The harmful acoustic echo is extracted and separated from the speech signal through digital signal processing. The system uses an acoustic echo canceller that identifies and removes echo components from the microphone signal, allowing the embedded microphone design to be maintained without suffering from echo contamination.
Solution Approach 2:
The system implements a feedback mechanism where the speaker output signal is fed into an acoustic echo canceller that models the acoustic path from speaker to microphone. This adaptive filter continuously adjusts to cancel the predicted echo signal, enabling the embedded microphone to function without echo interference.
2Volume of moving object
If the microphone is positioned closer to the speaker for compact design, then device size is reduced, but echo pickup increases due to acoustic coupling
Solution Approach 1:
The patent replaces mechanical separation solutions with digital signal processing to solve the echo problem. Instead of physically separating the microphone and speaker, the system uses adaptive digital filtering and acoustic echo cancellation algorithms to eliminate echo electronically, enabling compact design without compromising communication quality.
3Object-generated harmful factors
If the microphone is placed farther from the speaker to reduce echo, then echo control is improved, but the distance from the mouth position increases, reducing signal-to-noise ratio
Solution Approach 1:
The system introduces digital signal processing as an intermediary between the microphone and the final speech output. The acoustic echo canceller and noise suppression algorithms act as mediators that enhance the speech signal while removing echo and ambient noise, allowing the microphone to be positioned optimally for both echo control and speech capture.
4Measurement precision
If a boom microphone is used to improve voice input quality, then signal-to-noise ratio is improved, but the headset appearance becomes awkward and mechanical durability decreases
Solution Approach 1:
The patent extracts the harmful mechanical boom structure from the headset design and replaces it with an embedded microphone. Digital signal processing techniques are used to extract and enhance the speech signal from the embedded microphone, eliminating the need for mechanical extension structures and their associated reliability issues.
Solution Approach 2:
The system changes the operational parameters of the embedded microphone through digital signal processing. By applying adaptive filtering, noise suppression, and echo cancellation algorithms, the effective signal quality is enhanced without changing the physical position or structure of the microphone, achieving boom-mic quality with embedded-mic simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves effective echo control and noise cancellation, improving communication quality by suppressing unwanted signals and enhancing speech clarity, resulting in a compact and durable headset design.
Implementation Method 1
echo from the headset speaker will be picked up by the embedded microphone due to acoustic coupling
Implementation Method 2
the wireless electronic circuitry processes the received audio signals and outputs the processed signals
Data Source
AI summary
The present invention provides a wireless headset with echo control and noise cancellation. The present invention also provides a method with phase reversion for echo control of a wireless headset wherein the wireless headset comprises closely disposed speakers and acoustic sensors. The present invention further provides a method with beamforming for noise cancellation of a wireless headset wherein the wireless headset comprises two separate units disposed in distance, and wherein each unit comprises an acoustic sensor.