MUMBAI, India, July 24 -- Intellectual Property India has published a patent application (202641064098 A) filed by Chennai Institute Of Technology on May 21, 2026, for A Hybrid Acoustic Attenuation System For Hvac Ducts Using Active Noise Control And Passive Sound Baffle Integration.
Inventors include Dr. Nallathambi K; Dr. Sathiyamoorthi R; J Bejin Paul; Ranesh Jagadev Shakkthivel; Sankara Ganapathy G; and Srinivaasan G.
The application for the patent was published on July 17, 2026, under issue no. 29/2026.
Abstract: Title: A HYBRID ACOUSTIC ATTENUATION SYSTEM FOR HVAC DUCTS USING ACTIVE NOISE CONTROL AND PASSIVE SOUND BAFFLE INTEGRATION The titled invention discloses a hybrid acoustic attenuation system for reducing noise emissions in Heating, Ventilation, and Air Conditioning (HVAC) systems, particularly in an air handling unit and duct arrangement (1). The system integrates both passive acoustic elements (2) and an active noise control system (6) to achieve effective broadband noise reduction while maintaining airflow efficiency. The invention comprises a duct-based acoustic control arrangement including sound baffles (3), acoustic louvers (4), and a vibration isolation system (5) combined with a feedforward active noise control system (6). The active noise control system (6) utilizes a reference microphone (7), a controller (adaptive filter) (8), and a secondary source (speaker) (9) to generate anti-noise signals that destructively interfere with primary noise. An error microphone (10) is used to monitor residual noise and provide feedback for adaptive control. The system attenuates both tonal and broadband noise components across a wide frequency range. The invention incorporates aerodynamic design improvements and optimized placement of passive acoustic elements (2) to minimize airflow resistance and enhance system efficiency. Additionally, the system supports integration with building management systems (BMS) for real-time monitoring and adaptive control of noise levels. The proposed hybrid approach offers improved acoustic comfort, regulatory compliance, and energy-efficient operation compared to conventional noise control methods.
Disclaimer: Curated by HT Syndication.
