Adaptive Stereo Audio Processing for Handheld Devices
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Solution Overview
Problem
Conventional methods for managing audio input/output components in handheld devices are inefficient and costly, particularly when it comes to achieving optimal stereophonic audio recordings due to suboptimal microphone placement, which degrades the stereophonic recording performance.
Innovation Solution
The implementation of adaptive digital processing techniques that simulate the effects of optimally spaced microphones with directional reception characteristics, even when microphones are placed close together, by modifying the audio signals to create a noticeable amplitude difference based on the direction of the audio source, effectively enhancing stereophonic recording quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If microphones are placed close together in handheld devices, then device compactness is improved, but stereophonic recording performance deteriorates
Solution Approach 1:
The patent creates virtual microphone signals by copying and processing the actual microphone signals. It synthesizes left and right channel signals that mimic what optimally spaced microphones would capture, using digital signal processing to replicate the acoustic field without physically spacing microphones apart.
Solution Approach 2:
The patent replaces the mechanical solution of physically spacing microphones apart with a digital signal processing system. Instead of using mechanical/acoustic separation to achieve stereophonic effect, it uses adaptive digital filtering and signal synthesis to create the same effect computationally.
2Length of moving object
If microphones are placed close together, then device size is reduced, but audio source differentiation capability deteriorates
Solution Approach 1:
The patent changes the parameters of the audio signals through digital processing. It applies adaptive filtering, gain adjustment, and time-delay processing to the microphone signals to enhance the amplitude and phase differences that encode spatial information, thereby improving audio source differentiation despite close physical spacing.
Solution Approach 2:
The patent performs preliminary processing of the microphone signals to prepare them for optimal stereophonic reproduction. It pre-calculates and applies filtering coefficients and gain adjustments based on the known microphone spacing and desired virtual spacing, enabling accurate audio source differentiation before the signals are output.
3Device complexity
If conventional audio processing is used with closely placed microphones, then device complexity is minimized, but stereophonic effect quality deteriorates
Solution Approach 1:
The patent introduces intermediary processing stages between the microphones and the output. It uses digital signal processing algorithms as intermediaries to transform the raw microphone signals into enhanced stereophonic signals, adding necessary processing complexity to achieve superior audio quality.
Data Source
AI summary
Methods and systems are provided for enhanced stereo audio recordings in electronic devices. Stereophonic recording performance in an electronic device, using a first microphone and a second microphone in the electronic device, may be assessed; and processing of signals generated by the first microphone and the second microphone may be configured based on the assessed stereophonic recording performance. The configuring may comprises adaptively modifying the processing to enhance stereophonic recording performance, to match or approximate an ideal performance. The assessing of the stereophonic recording in the electronic device may be based on a type of each of the first microphone and the second microphone, and/or based on a spacing therebetween. The processing may be adaptively modified to simulate directional reception of signals by the first microphone and the second microphone when the microphones are omnidirectional.