IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

In the original paper [see ibid., vol. 41, no. 5, 1994] the last page was omitted. The missing text is now given. View full abstract»

We present an efficient method for analyzing the statistical properties of weighted median filters. It is based on a fast algorithm for computing the Hamming distribution of the zero-set of the defining positive Boolean function. We also show that the standard median filter is in a statistical sense optimal among the stack filters defined by self dual positive Boolean functions View full abstract»

Two approaches-a direct and a progressive-for the design of a class of 2-D FIR digital filters in the frequency domain using Kronecker products and a new class of 2-D Newton-type polynomials are presented. The sample grid under consideration is described by the `product representation' {ωx1,ωWx2,...,ω xm}×{ωy1,ωWy... View full abstract»

This paper shows the applicability of the well-known projection learning rule to the design of associative memories based on continuous-time neural networks, with sigmoidal nonlinearities. The proposed design method exhibits several interesting features: learning capability, computational efficiency, exact storage of binary vectors as asymptotically stable equilibrium points, and global stability ... View full abstract»

This paper describes efficient architectures for FIR filters. By exploiting the reduced complexity made possible by the use of two powers-of-two coefficients, these architectures allow the implementation of high sampling rate filters of significant length on a single field-programmable gate array (FPGA) View full abstract»

A novel approach to the design of 2-D linear-phase FIR filters with finite-precision wordlength is presented. The key idea of this approach is the “shaping” of the desired impulse response within time constraint imposed by the filter specification. This approach, named IRS (Impulse Response Shaping), minimizes the objective error function in logical steps by utilizing a property of Fou... View full abstract»

LBRness is a critical criterion for low-sensitivity realizations of digital filters in the form of LBR two-pair cascades. This paper points out that there has been a missing case in the existing LBR criteria for Type 3 two-pairs, and provides a complete set of the Type 3 LBR criteria View full abstract»

This paper describes a high-quality analog oscillator for low-frequency applications, which uses a combination of over-sampling and delta-sigma modulation. With the exception of a lowpass filter and a 1-bit D/A, the proposed circuit is entirely digital, providing accurate control over the oscillation frequency and amplitude. At the core of the oscillator is a digital simulation of an LC-tank circu... View full abstract»

This paper considers the design of linear-phase quadrature mirror filters (QMF's) with powers-of-two coefficients. A design method based on a recently developed weighted least-squares (WLS) algorithm is presented. First, we design QMF's with continuous coefficients using the WLS algorithm. This design process provides two favorable design results that the prototype analysis filter has quasi-equiri... View full abstract»

In this paper, a new procedure of 2-D filter stability test is proposed based on linking and further development of some newly published contributions of the authors. The modified polynomial array given in this paper eliminates redundant information introduced in the ordinary table technique and leads to a great reduction in the order of polynomial entries of the array from n22n(1/... View full abstract»

In this paper the design of modulo 2n-1 adders is discussed. Two new design procedures are given, based on the one-level and the two-level carry look-ahead addition algorithms. The adders designed according to the procedures proposed in this paper are significantly more efficient, with respect to speed and the cost function area-time product, than the corresponding adders already known ... View full abstract»

A simple and high-performance approach is derived for combining multiple low-transition-rate digital test pattern channels to produce a single high-transition-rate one. Additional circuitry includes only delay elements and exclusive-or logic gates, so the speed is not limited by clocking constraints. Any cyclic output pattern with a period of p bits can be produced by appropriate programming of th... View full abstract»

This paper presents the principle and application of an adaptive noise equalizer (ANE) with adjustable gain or attenuation capabilities. The residual error of the ANE system contains the narrow-band noise components whose amplitude can be linearly and arbitrarily controlled by adjusting the gain parameter of the equalizer. Each ANE consists of a sinusoidal reference input and two adaptive weights.... View full abstract»