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• W2107596024 abstract "We present a time-varying coefficient difference equation representation for sinusoidal signals with time-varying amplitudes and frequencies. We first obtain a recursive equation for a single chirp signal. Then, using this result, we obtain time-varying coefficient difference equation representations for signals composed of multiple chirp signals. We analyze these equations using the skew-shift operators. We show that the phases of the poles of the difference equations produce instantaneous frequencies (IF), and the magnitudes are proportional to the ratio of successive values of the instantaneous amplitudes (IA). Then algorithms are presented for the estimation of instantaneous frequencies and instantaneous amplitudes for multicomponent signals composed of chirps using the difference equation representation. The first algorithm we propose is based on the skew-shift operators. Next we derive the conditions under which we can use the so-called frozen-time approach. We propose an algorithm for IF and IA estimation based on the frozen-time approach. Then we propose an automatic signal separation method. Finally, we apply the proposed algorithms to single and multicomponent signals and compare the results with some existing methods." @default.
• W2107596024 created "2016-06-24" @default.
• W2107596024 creator A5073720488 @default.
• W2107596024 date "1996-01-01" @default.
• W2107596024 modified "2023-09-22" @default.
• W2107596024 title "Difference equation representation of chirp signals and instantaneous frequency/amplitude estimation" @default.
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• W2107596024 doi "https://doi.org/10.1109/78.553470" @default.
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