A Power Spectrum Density Model for 5.1 Audio Cinema System Using the Fast Fourier Transform
Keywords:
FFT, audio system, power spectrum density, digital signal processor.Abstract
Digitalization in cinema projection has promoted a
more efficient monitoring and projection systems, this allows improving supervision and projection status worldwide. Nevertheless, the monitoring systems do not include the ability to detect audio failures. In this paper a power spectrum density model for a 5.1 audio cinema system is proposed. The model was determined by using data from a DSP system located into a demo projection hall. The DSP algorithm performs the
white-noise emission, data acquisition, feature extraction and failure classification routines. The FFT and power spectrum density algorithms allow characterizing non-failure and failure sound system behaviors. The model is able to classify low and
high levels of sound pressure, the absence of specific channels, as well as the missing of low, mid and high drivers at frontal and sub-woofer channels.
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