IJMTES – MODIFIED SECOND-ORDER FREQUENCY TRANSFORMATIONS BASED VARIABLE DIGITAL FILTERS

Journal Title : International Journal of Modern Trends in Engineering and Science

Author’s Name : Karthika M | Sridevi A

Volume 02 Issue 12  Year 2015

ISSN no: 2348-3121  

Page no: 60-62

Abstract The frequency transformation based filters (FT filters) give an complete control over the cutoff frequency. On the other hand the cutoff frequency range of the FT filters is inadequate. FTCDM filter has wider cut off frequency range compared to the FT filter. But it also has limited range of cutoff frequency range; To overcome the problem of limited cutoff frequency range using a modified second-order frequency transformation based filter (MSFT filter). The one-to-one mapping condition stuck between the frequency variables and use low-pass to high-pass transformation on the prototype filter to attain wider range of cutoff frequency. That the MSFT filter provides 3.1 and 1.23 times wider cut off frequency range compared to FT and FTCDM filters. By using the MSFT filter the cut off frequency range can be improved.

Keywords Finite Impulse Response (FIR) filter, frequency transformations, variable linear-phase digital filter

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