Multi-Microphone Sound Recording for 5.1 Surround Audio
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Solution Overview
Problem
Mobile devices equipped with microphones can only record single-channel or dual-channel audio data, resulting in a limited sound field range and lack of immediacy in recorded audio.
Innovation Solution
A sound recording method and device that utilize at least three microphones to acquire and process sound signals, calculating central, left, right, rear left, rear right, and bass channel signals in a multi-channel surround audio system, combining these to produce a 5.1 sound channel signal without altering the device's hardware configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile devices use only one or two microphones for recording, then the device complexity is low, but the sound field range and audio immediacy are limited
Solution Approach 1:
The patent transforms the spatial arrangement of microphones from a single plane to a three-dimensional configuration, positioning at least one microphone at a different height from the other microphones. This dimensional change enables the system to capture sound from multiple spatial dimensions, expanding the sound field range and improving audio immediacy without proportionally increasing device complexity
Solution Approach 2:
The patent divides the audio recording function into multiple independent microphone channels, with each microphone capturing sound from its specific spatial position. The processing unit then segments and processes signals from each microphone independently before combining them, allowing for precise control over the multi-channel audio output and enabling sophisticated sound field reconstruction
2Measurement precision
If the system processes multiple sound channels to create surround audio, then the audio quality and immediacy improve, but the computational complexity increases
Solution Approach 1:
The patent performs preliminary processing on sound signals from each microphone channel before combining them. The processing unit applies specific algorithms to each channel's signal in advance, including noise reduction, equalization, and spatial positioning calculations, which simplifies the subsequent mixing and rendering processes while maintaining high audio quality
Solution Approach 2:
The patent creates virtual audio channels by copying and processing signals from physical microphones. The processing unit generates additional audio channels that did not physically exist, using signal processing techniques to synthesize surround sound from the limited physical microphone inputs, thereby improving audio quality without requiring proportional increases in hardware complexity
Data Source
AI summary
A sound recording method and device are provided in the field of multimedia processing. The method is applied in a mobile terminal including three microphones, including: acquiring three channels of sound signals collected by the three microphones; calculating a central channel signal, a left channel signal, a right channel signal, a rear left channel signal and a rear right channel signal in a multi-channel surround audio system according to the three channels of sound signals; calculating a bass channel signal in the multi-channel surround audio system according to the three channels of sound signals; and combining the above signals to obtain a sound signal of the multi-channel surround audio system.