Multi-Channel Audio HRTF Processing for Two-Channel Surround Sound
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Solution Overview
Problem
Conventional devices with only two channels, such as TVs and mobile phones, cannot produce surrounding stereoscopic sound effects despite handling multi-channel audio data.
Innovation Solution
An audio data processing method that involves obtaining position angles for each channel, applying head-related transfer functions to convolve audio data, and superimposing left and right channel data to create a target audio frame, effectively transforming multi-channel audio into a two-channel format for stereoscopic sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-channel audio data is processed using conventional two-channel playback devices, then the device can play back audio, but surrounding stereoscopic sound effects cannot be achieved
Solution Approach 1:
The patent transforms multi-channel audio data into two-channel format by applying head-related transfer functions (HRTF) that modify the acoustic parameters of the audio signal. The HRTF convolution process changes the temporal and spectral characteristics of the audio data to simulate spatial positioning, enabling surround sound effects through parameter transformation rather than physical speaker multiplication
Solution Approach 2:
The patent introduces head-related transfer functions as an intermediary processing layer between the multi-channel audio source and the two-channel playback device. The HRTF acts as a virtual acoustic mediator that simulates how sound waves interact with the human head and ears, creating the perception of spatial sound positioning without requiring additional physical speakers
2Measurement precision
If multi-channel audio data is directly output to two-channel devices, then the playback process is simple, but spatial sound positioning cannot be simulated
Solution Approach 1:
The patent performs preliminary processing of multi-channel audio data by pre-calculating and applying head-related transfer functions before the audio reaches the playback device. The HRTF convolution is performed in advance on each channel's audio data, encoding spatial positioning information into the audio signal itself, so that the simple two-channel device can reproduce accurate spatial sound effects without requiring complex real-time processing
Data Source
AI summary
An audio data processing method, an audio data processing apparatus, a terminal, and a computer-readable storage medium are disclosed. In the embodiments of the present invention, a multi-channel audio is processed into left and right channel audio, and the users can experience the effect of surround sound when listening to a target audio.