Sample data band-pass filter device
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United States of America Patent
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Apr 24, 1990
Grant Date -
N/A
app pub date -
Jun 17, 1987
filing date -
Jun 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The sampled-data band-pass filter device is based on the phenomemon of aliasing, and allows the substantially unattenuated passage of the components of an input signal at a frequency included within an interval comprised between a first frequency (f.sub.sL) and a second frequency (f.sub.sH), arranged around a third frequency (f.sub.sO), while it substantially attenuates the components of the input signal at frequencies outside said interval, and furthermore automatically performs the shift to low-frequency, around a fourth frequency (f.sub.O), of the components of the input signal which have passed without attenuation. According to the invention, the device comprises, as filter element, a sampled-data band-pass filter which employs, as sampling frequency, a fifth frequency (f.sub.s) equal to a whole submultiple of a sixth frequency (nf.sub.s) equal to the sum of the third frequency (f.sub.sO) and the fourth frequency (f.sub.O), having, as lower and upper cutoff frequencies, respectively the difference between the sixth frequency and the second frequency (nf.sub.s -f.sub.sH) and the difference between the sixth frequency and the first frequency (nf.sub.s -f.sub.sL).
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