Algoritmo para la cancelación de realimentación acústica

An algorithm for the control of acoustic feedback functions as a control system whose main objective is to uncouple the closed-loop feedback of an electro-acoustic system, once it becomes unstable. This process of control over the electroacoustic path provides advantages, among which the optimization of time is emphasized when adjusting a monitoring system and preventing damage to the equipment used. In the present work the origin of the instability of the sound reinforcement systems is detailed and an algorithm is proposed for the correction of multiple feedbacks, developed under the principle of suppression of couplings with slot filter (SAFR), detecting peaks of spectral energy and applying a second-order notch IIR filter in the discriminated frequencies by means of the RPPL criterion (peak power limit ratio). Quantitative and qualitative audio signals were analyzed with people performing sound reinforcement works, this in order to detect signal degradations as changes in the total harmonic distortion of the signal and possible variations of the fundamental frequency, of the same In this way, the group delay generated by the filter is measured. The results showed that the algorithm for the control of acoustic feedback fulfills the objective in estimation and attenuation of spectral peaks, showing faults in the cancellation of low frequency because the bandwidth of the filter is not adaptable according to the frequency. The group delay generated by IIR filters in cascade is small and possible to implement up to order 33, for this reason the algorithm can be implemented in contexts of sound reinforcement. The result of the qualitative test evinced that the algorithm is inefficient when it is implemented in a signal adder, but it presents good performance when implemented in individual signals

• Autores: Murillo González, Cristian Danilo
• Fecha de publicación: 2020
• Institución: Universidad de San Buenaventura
• Repositorio: Repositorio USB
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.usb.edu.co:10819/8009
• Acceso en línea: http://hdl.handle.net/10819/8009
• Palabra clave: Realimentación acústica; Sistema de control; Supresión de acoples con filtro de ranura; Relación pico potencia limite; Acoustic feedback; Control system; Suppression of couplings with slot filter; Peak power limit ratio; Sistemas de control
• License: Atribución-NoComercial-SinDerivadas 2.5 Colombia