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Article history: Received: 04 June, 2018 Accepted: 24 July, 2018 Online: 29 July, 2018 Noise defined as 'a sensation of unwanted intensity of a wave', is perception of a pollutant and a type of environmental stressor. The unwanted intensity of a wave is a propagation of noise due to transmission of waves (viz. physical agents) such as light, sound, heat, electricity, fluid and fire. The characterization of noise interference, due to power difference of two intensities in a wave is presented. Noise interference characterization in a wave is obtained depending on type of wave. Standard definitions of noise sources, their measurement equations, their units and their origins under limiting reference conditions are derived. All types of wave form one positive power cycle and one negative power cycle. The positive and negative noise scales and their units are devised depending on speed of noise interference in a wave. A numerical and experimental study was conducted for supporting the noise characterization theory via ascertainment of energy conversion characteristics of a pair of photovoltaic (PV) modules integrated with solar wall of an outdoor test-room. A pre-fabricated outdoor room was setup for conducting outdoor experiments on a PV solar wall with ventilation through the outdoor room. Acoustic signal processing is supported with some experimental and numerical results of a parallel plate PV solar wall device installed in an outdoor test-room to authenticate the noise interference equations. Detailed discussions on noise characterization theory along with some examples of noise filter systems as per noise sources are also presented. The noise characterization theory is also exemplified with some noise unit calculations using presented noise measurement equations.

Acoustic Signal Processing and Noise Characterization Theory via Energy Conversion in a PV Solar Wall Device with Ventilation through a Room