A Design of Two-stage Cascaded Polyphase FIR Filters for the Sample Rate Converter 


Vol. 31,  No. 8, pp. 806-815, Aug.  2006


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  Abstract

It is studied to design a low pass filter of the SRC(sample rate converter), which is used to change the sampling rate of digital signals such as in digital modulation and demodulation systems. The larger the conversion ratio of the sample rate becomes, the more signal processing is needed for the filter, which corresponds to the more complexity in circuit realization. Thus it is important to reduce the amount of signal processing for the case of high conversion ratio. In this paper it is presented a design method of a two-stage cascaded FIR filter, which proved to have reduced amount of signal processing in comparison with a conventional single-stage one. The reduction effect of signal processing turned out to be more noticeable for larger value of conversion ratio, for instance, giving down to 72% in complexity for the conversion ratio of 32. It has been shown that the reduction effect is dependent to specific combination of conversion ratios of the cascaded filters. So an exhaustive search has been performed in order to obtain the optimal combination for various values of the total conversion ratio. In this paper every filter is considered to be implemented in the form of a polyphase FIR filter, and its coefficients are determined by use of the Parks-McCllelan algorithm.

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  Cite this article

[IEEE Style]

J. Baek and J. Kim, "A Design of Two-stage Cascaded Polyphase FIR Filters for the Sample Rate Converter," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 8, pp. 806-815, 2006. DOI: .

[ACM Style]

Jein Baek and Jin-Up Kim. 2006. A Design of Two-stage Cascaded Polyphase FIR Filters for the Sample Rate Converter. The Journal of Korean Institute of Communications and Information Sciences, 31, 8, (2006), 806-815. DOI: .

[KICS Style]

Jein Baek and Jin-Up Kim, "A Design of Two-stage Cascaded Polyphase FIR Filters for the Sample Rate Converter," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 8, pp. 806-815, 8. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880