Correlation Based Automatic Volume Control System for Television/ Radio

Automatic volume control (AVC) changes volume of TV/Radio based on surroundings noise. A number of hardware and software implementation of AVC is available. Conventional AVC methods concentrates on maintain a constant power-ratio between input of microphone and speaker-output signals. Some new methods are concentrating on preserving intelligibility of speech. They are extracting desired frequency band then comparing their power. This paper proposes Correlation based volume control for radio/Smart Television. Proposed Correlation Method adjusts volume based on linearity of input of microphone and speaker-output signals. A band-pass filter is used to filter-out unwanted frequency bands for comparing sound intelligibility. Conventional system concentrates on maintaining SNR. Proposed method adjusts volume considering delay and wave-shape of input of microphone and speaker-output signals.