In order to tune the
high-pass filter, the matrix Cx will be set considering the levels j = 1, ..., [j.sub.h].
LPS and HPS represent low-pass and
high-pass filters, respectively.
On the other side,
high-pass filters are the exact opposite of low-pass.
Since the real sensor does not respond down to 0 Hz, the FEM signal was
high-pass filtered (Butterworth) at 6 kHz (5 pole).
To enhance the periodicity of silent frame's second derivative and reduce the interference of speech, we propose five audio resampling detection steps: (1) use of the Voice Active Detect (VAD) algorithm to divide a given audio signal into voice clips and silent frames; (2) calculation and transformation of the second-order difference into spectrum; (3) filtration of the audio frequency components through the
high-pass filter and preservation of the frequency components of heavy resampling period; (4) use of the dictionary learning method to train resampling sparse classifiers; and (5) according to the test sample belonged to which codeword of the dictionary, calculated by ORMP, classification of the test sample.
Therefore, an L-shape
high-pass filter with a series capacitor of 14 pF and a shunt inductor of 5nH is incorporated, which generates one lower-frequency resonant mode at about 880 MHz to successfully cover the operating bands of GSM850/900, and simultaneously contributes another upper-frequency resonant mode at about 2500 MHz for the upper-band.
Analysis was applied for 30 different
high-pass filter frequencies ranging from f = 0.05 Hz to 6 Hz.
The
high-pass filter eliminates the "DC component" of y.