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- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Peter Kwong-Shun Tam
- IEEE Trans. on Circuits and Systems
- 2008

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Joshua D. Reiss
- IEEE Trans. on Circuits and Systems
- 2006

—In this paper, a fuzzy impulsive control strategy is proposed. The state vectors that the impulsive controller resets to are determined so that the state vectors of interpolative low-pass sigma–delta modulators (SDMs) are bounded within any arbitrary nonempty region no matter what the input step size, the initial condition and the filter parameters are,… (More)

It has been established that a class of bandpass sigma delta modulators (SDMs) may exhibit state space dynamics which are represented by elliptical or fractal patterns confined within trapezoidal regions when the system matrices are marginally stable. In this paper, it is found that fractal patterns may also be exhibited in the phase plane when the system… (More)

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Hak-Keung Lam, Muhammad H. U. Nasir
- IEEE Transactions on Neural Networks
- 2008

In this paper, it is found that the weights of a perceptron are bounded for all initial weights if there exists a nonempty set of initial weights that the weights of the perceptron are bounded. Hence, the boundedness condition of the weights of the perceptron is independent of the initial weights. Also, a necessary and sufficient condition for the weights… (More)

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Zhi-Wei Chi, Mohammad Shikh-Bahaei, Yanqun Liu, Kok Lay Teo
- IEEE Trans. on Circuits and Systems
- 2008

—In this brief, a near allpass strictly stable minimal phase real valued rational IIR filter is designed so that the maximum absolute phase error is minimized subject to a specification on the maximum absolute allpass error. This problem is actually a minimax nonsmooth optimization problem subject to both linear and quadratic functional inequality… (More)

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Yanqun Liu, Peter Kwong-Shun Tam, Kok Lay Teo
- IEEE Trans. on Circuits and Systems
- 2008

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Lamia Benmesbah, Chi-Wah Kok, Wan-Chi Siu, Kok Lay Teo
- IEEE Transactions on Signal Processing
- 2010

In this correspondence, a two-channel linear phase finite-impulse-response (FIR) quadrature mirror filter (QMF) bank minimax design problem is formulated as a nonconvex optimization problem so that a weighted sum of the maximum amplitude distortion of the filter bank, the maximum passband ripple magnitude and the maximum stopband ripple magnitude of the… (More)

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Yanqun Liu, Peter Kwong-Shun Tam, Kok Lay Teo
- IEEE Transactions on Signal Processing
- 2005

This correspondence considers an optimum nonuniform finite impulse response (FIR) transmultiplexer design problem subject to specifications in the frequency domain. Our objective is to minimize the sum of the ripple energy for all the individual filters, subject to the specifications on amplitude and aliasing distortions, and to the passband and stopband… (More)

- Bingo Wing-Kuen Ling, Charlotte Yuk-Fan Ho, Peter Kwong-Shun Tam
- I. J. Bifurcation and Chaos
- 2005

In this letter, the normalized histogram of the state variable of first-order digital filters with two's complement arithmetic is investigated. When the pole of the digital filter is between 1 and 2, it is found that the possibility of occurrence of the state variable in certain region is close to zero no matter what the initial condition is. Some analytic… (More)

- Charlotte Yuk-Fan Ho, Bingo Wing-Kuen Ling, Joshua D. Reiss, Xinghuo Yu
- I. J. Bifurcation and Chaos
- 2005

⎯It has been established that the class of bandpass sigma delta modulators (SDMs) with single bit quantizers could exhibit state space dynamics represented by elliptic or fractal patterns confined within trapezoidal regions. In this letter, we find that elliptical fractal patterns may also occur in bandpass SDMs with multi-bit quantizers, even for the case… (More)