Whilst I couldn't find the exact chip, I did find this on the ALC5520, which is presumably an older or slightly less competent variant based on the numbering.
Realtek's far-field multi-microphone speech recognition enhanced single-chip solution (ALC5520) won the 2018 ``Hsinchu Science Industrial Park Excellent Manufacturer Innovative Product Award''
2018/12/12
[Hsinchu, Taiwan, December 12, 2018]
Realtek Semiconductor , the world's leading IC design company, today announced that its far-field multi-microphone speech recognition enhanced single-chip solution (ALC5520) won the 2018 "Hsinchu Science Industrial Park Excellent Manufacturer Innovation" Product Award".
Realtek ALC5520 audio/voice signal processor (Audio/Voice DSP) is a system-on-a-chip that realizes a complete solution for long-distance voice applications. The chip integrates 103dB high signal-to-noise ratio (Signal-to-Noise Ratio) low-power analog-to-digital converter (Analog to Digital Converter), 32-bit multi-core DSP+vFPU and Realtek's latest generation of voice enhancement technology, which greatly improves in noisy/ Voice recognition performance in long-distance (over 10 meters) environments.
Realtek ALC5520 provides a complete solution with ultra-low power consumption and high integration, with a competitive QFN8x8mm package size, showing the following technologies and market advantages:
● complete solution distance speech applications
● 103dB high SNR (Signal-to-Noise Ratio) low power analog to digital converter (the ADC)
● over 32 high-performance core + VFPU the DSP
● low power consumption
● in Provides excellent voice recognition enhancement in noisy/long-distance environments
● Simplified peripheral parts and minimized PCB size reference design
● Easy upgrade/addition of voice input and recognition functions for various products and applications
Realtek's spokesperson Huang Yiwei, vice president, said: "The high-efficiency and extremely low-power design makes the ALC5520 widely suitable for applications that require voice input and recognition, such as smart speakers/smart TVs/mobile devices/white goods/car electronics.
Realtek The ALC5520 not only establishes a higher standard for enhanced speech recognition, but also assists the rapid popularization of speech technology in various industrial products."
www.realtek.com