# A gradient algorithm for center-frequency adaptive recursive bandpass filters

@article{RajaKumar1985AGA, title={A gradient algorithm for center-frequency adaptive recursive bandpass filters}, author={R.V. Raja Kumar and Ranendra N. Pal}, journal={Proceedings of the IEEE}, year={1985}, volume={73}, pages={371-372} }

Mean-square output of a center-frequency variable bandpass filter is employed as the performance criterion to make the filter self-adjusting to the center frequency of the input signal. A gradient ascending algorithm is proposed to update the center-frequency-dependent coefficients of the filter to maximize the performance function.

#### 25 Citations

Recursive center-frequency adaptive filters for the enhancement of bandpass signals

- Computer Science
- IEEE Trans. Acoust. Speech Signal Process.
- 1986

A new adaptive algorithm, namely, the recursive maximum-mean-squares (RMXMS) algorithm, is developed based on the gradient ascent technique for the implementation of these filters. Expand

Tracking of bandpass signals using center-frequency adaptive filters

- Computer Science
- IEEE Trans. Acoust. Speech Signal Process.
- 1990

The tracking performance of two examples of these filters are analyzed for step, ramp, and sinusoidal variations of the input signal center frequency, and these are shown to track the signals very effectively. Expand

Convergence analysis of adaptive bandpass/notch filters with colored noisy signal

- Mathematics
- Proceedings of the 33rd Midwest Symposium on Circuits and Systems
- 1990

A method to obtain the convergence speed of adaptive bandpass/notch filters is proposed. The basic idea is the integration of the average step size for a coefficient update algorithm. The adaptive… Expand

An adaptive filter bank implementation of adaptive IIR filters

- Engineering
- [1992] Conference Record of the Twenty-Sixth Asilomar Conference on Signals, Systems & Computers
- 1992

A subband adaptive IIR filter with a center-frequency adaptive filter bank is presented to implement multirate system identification. A recursive maximized mean-square algorithm is used in the filter… Expand

High-order center-frequency adaptive filters using block-diagram-based frequency transformation

- Mathematics, Computer Science
- 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
- 2011

Simulation results show that the proposed high-order center-frequency adaptive filters achieve higher signal-to-noise ratio (SNR) improvement than the conventional low-order filters including the adaptive notch filters. Expand

Bias Removal in Equation Error Adaptive IIR Notch Filter with Constrained Poles and Zeros

- Mathematics
- 2006 International Symposium on Communications and Information Technologies
- 2006

A new equation-error based gradient algorithm, which is derived from standard PG (plain gradient) algorithm, is proposed for a second-order adaptive IIR notch filter with constrained poles and zeros.… Expand

Recent Advances in Variable Digital Filters

- Computer Science
- 2018

This chapter introduces recent advances on variable digital filters, focusing on the problems of design and realization, and application to adaptive filtering, and introduces the details of adaptive bandpass/band-stop filtering. Expand

Efficient design of adaptive complex narrowband IIR filters

- Computer Science, Mathematics
- 2004 12th European Signal Processing Conference
- 2004

A BP/Bandstop adaptive filter structure is formed around this section, using LMS algorithm to adapt the central frequency and the bandwidth, and is convenient for cancellation/enhancement of complex sinusoids or narrowband signals. Expand

Tracking characteristics of the constrained IIR adaptive notch filter

- Mathematics, Computer Science
- 26th IEEE Conference on Decision and Control
- 1987

It is shown that the mean behavior of the adaptive filter coefficients can be studied by using an ordinary differential equation (ODE) and approximate and simple closed form results are derived for the tracking behavior of a second order notch filter. Expand

Tracking characteristics of the constrained IIR adaptive notch filter

- Mathematics
- 1987

In this paper, we study the tracking behavior of a constrained IIR notch filter whose coefficients are estimated using a constant step size Gauss-Newton algorithm. Using weak convergence theory and… Expand

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