Direct frequency estimation based adaptive algorithm for a second-order adaptive FIR notch filter

2008 ◽  
Vol 88 (2) ◽  
pp. 315-325 ◽  
Author(s):  
R. Punchalard ◽  
A. Lorsawatsiri ◽  
W. Loetwassana ◽  
J. Koseeyaporn ◽  
P. Wardkein ◽  
...  
Keyword(s):  
Adaptive Algorithm ◽  
Frequency Estimation ◽  
Notch Filter ◽  
Second Order ◽  
Adaptive Fir

Indirect frequency estimation based on second-order adaptive FIR notch filter

2009 ◽  
Vol 89 (7) ◽  
pp. 1428-1435 ◽  
Author(s):  
R. Punchalard ◽  
J. Koseeyaporn ◽  
P. Wardkein
Keyword(s):  
Frequency Estimation ◽  
Notch Filter ◽  
Second Order ◽  
Adaptive Fir

Arctangent Gradient Based Adaptive Algorithm for a Second-Order Adaptive IIR Notch Filter

2015 ◽  
Vol 781 ◽  
pp. 535-538
Author(s):  
Rachu Punchalard
Keyword(s):  
Adaptive Algorithm ◽  
Unbiased Estimator ◽  
Frequency Estimation ◽  
Notch Filter ◽  
Second Order ◽  
Filter Parameter ◽  
Adaptive Notch Filter ◽  
Slow Adaptation ◽  
Gradient Based

Frequency estimation based on adaptive notch filter is very attractive due to simplicity and economy. This paper presents an arctangent gradient (AG) based adaptive algorithm for a second-order constrained adaptive IIR notch filter (ANF). The motivation is to use an arctangent value of the gradient signal to adjust the filter parameter. It is revealed that for slow adaptation, the AG can be considered as an unbiased estimator. The quantitative simulations have been conducted to support the superior of the proposed AG algorithm.

scholarly journals Novel Grounded Capacitor All-Pass and Notch Filters Using Current Conveyors and Differential Amplifier

2003 ◽  
Vol 26 (3) ◽  
pp. 167-170 ◽  
Author(s):  
R. Saraswat ◽  
K. Pal ◽  
S. Rana
Keyword(s):  
Input Impedance ◽  
Transfer Functions ◽  
Notch Filter ◽  
Second Order ◽  
Differential Amplifier ◽  
Current Conveyors ◽  
Output Impedance ◽  
High Input ◽  
Notch Filters ◽  
High Input Impedance

Three circuits each realizing second-order all-pass/notch filter transfer functions are reported. All circuits use grounded capacitors and are suitable for IC implementation. These circuits offer the advantages of high input impedance and low output impedance and are superior to all earlier realisations.

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