A new surround sound mixing method and device based on FPGA

The FPGA-based 22.2-channel surround sound system solves the problem that traditional surround sound systems cannot accurately restore the three-dimensional spatial impression, and achieves stable three-dimensional audio positioning and sound and image reconstruction, which is suitable for the broadcasting and television fields.

CN116546399BActive Publication Date: 2025-09-26CHINA UNIV OF MINING & TECH
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Patent Information

Application Number
CN202310520387.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-10
Publication Date
2025-09-26
Estimated Expiration
2043-05-10

AI Technical Summary

Technical Problem

Traditional surround sound systems cannot accurately restore the three-dimensional spatial impression and reverberation information, resulting in the auditory experience being unable to keep up with the pace of improvement in video resolution, and relying on the listener's positioning information, resulting in unstable sound and image positioning.

Method used

Develop a 22.2-channel surround sound system based on FPGA. By defining the spatial position structure of speakers and virtual sources, calculating the gain coefficients and using the FPGA core board for digital signal processing, three-dimensional audio positioning and sound image reconstruction are achieved.

Benefits of technology

It provides consistent sound image positioning and spatial impression in large spaces without relying on the listener's positioning information. It can correctly restore the width and surround of the sound source in all directions and avoid distortion caused by listener movement.

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Abstract

The present invention provides a novel FPGA-based surround sound mixing method and device, comprising an ADC module, a DAC module, and an FPGA core board; the ADC module comprises a signal conditioning circuit, a programmable amplifier circuit, an ADC circuit, a first LVDS circuit, and a first auxiliary power supply; the signal conditioning circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first relay, a second relay, a third relay, a fourth relay, and a ULN2803 chip; this solution accurately restores the perceived sound source width and envelopment of each sound image in all directions, providing more accurate sound image localization and spatial impression. This solution can provide consistent sound image localization and spatial impression across a large spatial range, without distortion caused by the listener's movement or head rotation.
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