Modified linear phase frequency response masking FIR filter

Rodrigues, Joseph; Pai, K. R.

doi:10.1109/ispa.2005.195451

Cited by 15 publications

(6 citation statements)

References 4 publications

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“…Also large delays introduced are undesired in real time applications. Synthesis of sharp transition FIR lowpass filters is introduced by Rodrigues and Pai, (2005a), Rodrigues et al (2006). The simple analytical methods give narrow transition band with flat passband, good stopband attenuation with less filter order.…”

Section: Discussionmentioning

confidence: 99%

“…The interpolation designs introduce large group delays. One of the most successful techniques for the synthesis of arbitrary passband, very narrow transition width FIR filter with least filter order is the Frequency Response Masking (FRM) technique (Lim, 1986;Rodrigues and Pai, 2005a;Lim et al, 2007). The sharp transition and arbitrary bandwidth is formed by using several low order FIR subfilters.…”

Section: Introductionmentioning

confidence: 99%

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Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired

Shamala¹

2012

American Journal of Engineering and Applied Sciences

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Problem statement:A simple analytical approach to the synthesis of a sharp transition, linear phase, multiband FIR filter is presented. The filter magnitude response is modeled using trigonometric functions of frequency. Approach: Employing variable density of ripple cycles in passband and stopband regions with large density of ripples cycles at the sharp transition edges, reduces the abrupt discontinuities at these edges. Results: As a result, Gibb's phenomenon is reduced in the filter implementation thus giving a flat passband and good stopband attenuation. A closed form expression for impulse response coefficients is obtained. The filter design is easily tunable and allows for variation in transition bandwidth of each band. A speech processing scheme is implemented using a pair of the proposed sharp transition multiband FIR filters to split the speech spectrum into complementary short time spectral bands. Conclusion: The adjacent speech formants are fed dichotically to the two ears to reduce the effect of spectral masking and hence improve speech perception in sensorineural hearing impaired.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired

Shamala¹

2012

American Journal of Engineering and Applied Sciences

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“…If the coefficient quantization step size is , (17) may be rewritten as [54] ( 19) From (9) and (19), we have (20) Equation (20) provides useful statistic for the frequency response deviation due to coefficient quantization. Expression for is given in (12).…”

Section: Coefficient Sensitivity As a Function Of Frequencymentioning

confidence: 99%

FRM-Based FIR Filters With Optimum Finite Word-Length Performance

Lim

Teo

et al. 2007

IEEE Trans. Signal Process.

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It is well known that filters designed using the frequency response masking (FRM) technique have very sparse coefficients. The number of nontrivial coefficients of a digital filter designed using the FRM technique is only a very small fraction of that of a minimax optimum design meeting the same set of specifications. A digital filter designed using FRM technique is a network of several subfilters. Several methods have been developed for optimizing the subfilters. The earliest method optimizes the subfilters separately and produces a network of subfilters with excellent finite word-length performance. Subsequent techniques optimize the subfilters jointly and produce filters with significantly smaller numbers of nontrivial coefficients. Unfortunately, these joint optimization techniques, that optimize only the overall frequency response characteristics, may produce filters with undesirable finite word-length properties. The design of FRM-based filters that simultaneously optimizes the frequency response and finite wordlength properties had not been reported in the literatures. In this paper, we develop several new optimization approaches that include the finite word-length properties of the overall filter into the optimization process. These new approaches produce filters with excellent finite word-length performance with almost no degradation in frequency response performance.

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“…HE frequency response masking (FRM) technique [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] has received much attention for the synthesis of very sharp digital filters with very sparse coefficients. It has found applications in diverse fields including the synthesis of various types of filters such as half-band filters [21]- [23], 2D filters [24], IIR filters [25]- [28], filter banks [29]- [34], decimators and interpolators [35], [36], and Hilbert transformers [37], [38], FPGA implementations [39][40][41], transmultiplexer design [42], ECG signal processing [43], hearing aids [44], digital audio [45]- [49] application and analysis, speech recognition [50], array beamforming [51], software radio [52], and noise thermometer [53].…”

Section: Introductionmentioning

confidence: 99%

FRM-Based FIR Filters with Minimum Coefficient Sensitivities

Lim

Teo

et al. 2007

2007 IEEE International Symposium on Circuits and Systems (ISCAS)

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A method for optimizing FRM-based FIR filters with optimum coefficient sensitivity is presented. This technique can be used in conjunction with nonlinear optimization techniques to design very sharp filters that do not only have very sparse coefficient values but also very low coefficient sensitivity. 2962 1-4244-0921-7/07 $25.00 © 2007 IEEE. Authorized licensed use limited to: CURTIN UNIVERSITY OF TECHNOLOGY. Downloaded on October 2, 2009 at 03:42 from IEEE Xplore. Restrictions apply.

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Modified linear phase frequency response masking FIR filter

Cited by 15 publications

References 4 publications

Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired

Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired

FRM-Based FIR Filters With Optimum Finite Word-Length Performance

FRM-Based FIR Filters with Minimum Coefficient Sensitivities

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