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Comm Diss 311-page70

# Comm Diss 311-page70 - A band reject filter with cutoff...

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8 Using the frequency scale from problem 6.1, an amplitude range of 100 dB, and an aspect ratio of 20 dB per octave, sketch the amplitude portion of the frequency response of the following filters. 7.1. A low-pass filter with a cutoff frequency of 250 Hz and a frequency rejection slope of 24 dB/octave. 7.2. A high-pass filter with a cutoff frequency of 1000 Hz and a frequency rejection slope of 6 dB/octave. 7.3. A band-pass filter with cutoff frequencies of 2000 and 4000 Hz and frequency rejection slopes of 48 dB/octave. 7.4. An octave band filter with a center frequency of 2000 Hz and frequency rejection slopes of 24 dB/octave. 7.5. Octave band filters with center frequencies of 500, 1000, 2000, and 4000 Hz, with frequency rejections slopes of 48 dB/octave (draw all four on the same graph). 7.6. Same as (e) above but with one-third-octave filters. 7.7.
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Unformatted text preview: A band reject filter with cutoff frequencies of 1000 and 2000 Hz and frequency rejection slopes of 96 dB/octave. 7.8. A white noise with a spectrum level of 50 dB SPL is passed through a filter having a bandwidth of 2000 Hz. What is the level at the output of the filter. 7.9. A white noise with a spectrum level of 60 dB SPL is passed through a set of octave band filters with center frequencies of 500, 1000, 2000, and 4000 Hz. What is the predicted output of each of the filters? 7.10. A white noise is passed through a one-third-octave filter with a center frequency of 1000 Hz. The level at the output of the filter is 100 dB SPL. What is the spectrum level of the noise? 7.11. A white noise lowpass filtered at 10 kHz has an overall level of 70 dB SPL. What is the predicted level if the noise is instead filtered at 5 kHz?...
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