input of a Low Pass Filter (LPF) is White Noise (all the frequencies at the same intensity e.g. 0dB). The Cut Frequency of the LPF is 1200 Hz. The output of the LPF is connected to the input of a High Band Filter (HPF) with a Cut Frequency of 600Hz. You will hear  a. no sound b. frequencies between 600Hz and 1200Hz with an intensity of -20dB c. All the frequencies below 600Hz and above 1200Hz

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Filter

A filter is a device or process which removes some of the unwanted features or components like frequencies from a signal in signal processing. The feature of filters is the complete or partial suppression of some part of the signal, and filtering is a class of signal processing. This most often means removing some frequency bands or some frequencies. In the frequency domain, the filters do not exclusively act, especially in the image processing field many other targets for filtering exist. Without having to act in the frequency domain, the correlations can be removed for certain frequency components and not for others. The filters are widely used in electronics and telecommunication, in television, radio, radar, audio recording, music synthesis, control systems, computer graphics, and image processing.