Dual-Path DSP Noise Suppression for Near- and Far-End Calls
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Solution Overview
Problem
Conventional audio devices are limited in their ability to cancel noise only within their immediate environment, requiring significant processing power and electrical power, and cannot effectively suppress background noise from remote locations during calls, which disrupts communication quality.
Innovation Solution
An audio device equipped with a noise suppression system featuring a transceiver and a digital signal processing chip with an advanced call clarity module, capable of processing audio signals to cancel noise from both near and far ends by utilizing a first and second audio data path, and an AI-driven ACC algorithm to generate inverse audio data to eliminate background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional active noise cancellation (ANC) techniques are used to cancel noise in the audio device's location, then noise cancellation is achieved, but processing power and electrical power consumption increase significantly
Solution Approach 1:
The patent segments the noise cancellation task into two parts: near-end noise cancellation (performed by the audio device using ANC) and far-end noise cancellation (performed by the remote electronic device). This segmentation allows the audio device to avoid processing all noise sources, thereby reducing its computational load and power consumption while still providing comprehensive noise suppression.
Solution Approach 2:
The patent introduces an intermediary mechanism where the remote electronic device acts as a mediator to perform far-end noise cancellation. The remote device processes noise from its environment and sends cleaned audio data to the audio device, eliminating the need for the audio device to independently cancel all background noise, thus reducing its power requirements.
2Object-affected harmful factors
If conventional ANC techniques are used, then noise in the audio device's location is canceled, but noise from remote locations cannot be suppressed
Solution Approach 1:
The patent implements a universal noise cancellation system where both the audio device and the remote electronic device perform noise cancellation functions. This multi-functionality allows the system to suppress noise from multiple locations (near-end and far-end), expanding the overall noise cancellation coverage beyond what a single device could achieve alone.
Solution Approach 2:
The patent establishes a feedback loop where the remote electronic device sends audio data to the audio device, which then processes and returns canceled noise information. This bidirectional feedback mechanism enables continuous noise suppression from both locations, allowing the system to adaptively handle noise from diverse environments.
3Object-affected harmful factors
If the audio device processes all audio signals independently, then noise cancellation is performed, but the device cannot dynamically switch between different electronic devices
Solution Approach 1:
The patent introduces dynamic switching capability that allows the audio device to flexibly connect with different remote electronic devices based on usage scenarios. The system can dynamically activate or deactivate the far-end noise cancellation path depending on which device is currently connected, enabling adaptive operation while maintaining noise cancellation performance.
Data Source
AI summary
An audio device includes a noise suppression system that delivers output audio data to an audio output device of the audio device, and includes a transceiver that receives audio input data, and a digital signal processing (DSP) chip that receives first processed audio data from the transceiver and delivers the output audio data to the audio output device. The DSP chip includes an advanced call clarity (ACC) module that includes a first audio data path and a second audio data path, wherein an output both audio paths are delivered to a node coupled to the audio output device. The first audio data path delivers the first processed audio data to the audio output device, and the second audio data path generates ACC output audio data based on the received first processed audio data and delivers the ACC output audio data to the audio output device.