frequency transformation

frequency transformation

[¦frē·kwən·sē ‚tranz·fər′mā·shən]
(control systems)
A transformation used in synthesizing a band-pass network from a low-pass prototype, in which the frequency variable of the transfer function is replaced by a function of the frequency. Also known as low-pass band-pass transformation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Abstract: In this work, we present a frequency transformation based dual-band filter design approach using scattering based real frequency technique.
From (1), we can see that each [g.sub.k,m][n] is the different time and frequency transformation of prototype filter g[n].
The authors developed the frequency transformation for finding the locations of poles and zeros of specific tri-band filters [5].
Agrobacterium mediated high frequency transformation of an elite Indica rice variety Pusa Basmati 1 and transmission of the transgenes to R2 progeny.
Therefore by using frequency transformation technique 1D signal is transformed into 2D form.
The k-th coefficients of a frequency transformation represent similar frequencies, provided that the number of values in the time space is similar.
Obviously, now having different [f.sub.sk] for each resonator, the frequency transformation (Equation 3A) will no longer be strictly meaningful.
Hagiware, "Synthesis of dual-band bandpass filters using successive frequency transformation and circuit conversions," IEEE Microwave and Wireless Components Letters, Vol.
The same method can be used for variable cut-off frequency, using the very basic frequency transformation: the low-pass to low-pass filter transformation.
In order to avoid the optimization technique, a method called the frequency transformation technique has been presented in designing the dual-band BPF.
A frequency transformation can also be performed and the spectral composition of the error signal alone can be viewed.
The proposed method is based on the evaluation of the characteristic polynomials of the diplexer using the proposed linear frequency transformation and established method in [6], and then coupling matrix of overall resonator diplexer can be obtained using the proposed hybrid optimization methods.

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