Estimation of Frequency Characteristics of Super-Narrow Band Digital Filters
The verification of frequency characteristics of narrow-band biline structures is rather problematic. The traditional way of an estimation of dynamic frequency characteristics by the impulse response (IR) is inconvenient in this case because of its excessively big demanded length. It does not allow investigating the frequency characteristics with necessary accuracy by means of fast Fourier transformation (FFT). The last one brings practically unpredictable errors because of insufficient precision of machine arithmetic and excessively big number of demanded arithmetic operations. The new method of verification of frequency characteristics of recursive narrow-band systems is offered. The problem of a choice of necessary duration of the corresponding impulse response and criteria of its maximum deviation from ideal is being discussed. The examples of correct verification of dynamic characteristics are shown. Ill. 5, bibl. 9 (in English; summaries in English, Russian and Lithuanian).
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