Signal processor with improved efficiency
First Claim
1. A signal processor arranged and constructed to provide a discrete time Fourier transform (DTFT) corresponding to a sequence of samples, including a current sample, of a signal, the signal processor comprising in combination;
- a recursive structure, coupled to the signal and operating on the sequence of samples, for providing an output and a first previous output, said output proportional to a combination of the current sample of the signal and the first previous output weighted by a sinusoidal function, less a second previous output, said sinusoidal function having an argument corresponding to an arbitrary frequency, anda combiner coupled to said output and said first previous output for providing a DTFT signal proportional to a DTFT evaluated at said arbitrary frequency for said sequence of samples.
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Accused Products
Abstract
A signal processor arranged and constructed to provide a discrete time Fourier transform (DTFT) corresponding to a sequence of samples, including a current, preferably, last sample, of a signal, the signal processor including a recursive structure (303), coupled to the signal and operating on the sequence of samples, for providing an output (309) and a first previous output (310), the output proportional to a combination of the current sample of the signal, and the first previous output weighted by a sinusoidal function, less a second previous output (316), the sinusoidal function having an argument corresponding to an arbitrary frequency, and a combiner (330) coupled to the output and the first previous output for providing a DTFT signal proportional to a DTFT evaluated at the arbitrary frequency for the sequence of samples.
113 Citations
17 Claims
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1. A signal processor arranged and constructed to provide a discrete time Fourier transform (DTFT) corresponding to a sequence of samples, including a current sample, of a signal, the signal processor comprising in combination;
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a recursive structure, coupled to the signal and operating on the sequence of samples, for providing an output and a first previous output, said output proportional to a combination of the current sample of the signal and the first previous output weighted by a sinusoidal function, less a second previous output, said sinusoidal function having an argument corresponding to an arbitrary frequency, and a combiner coupled to said output and said first previous output for providing a DTFT signal proportional to a DTFT evaluated at said arbitrary frequency for said sequence of samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A symbol detector arranged and constructed to select a symbol encoded as frequency shift keyed (FSK) modulation from a sequence of samples, including a current sample, of a signal, the symbol detector comprising in combination;
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a recursive structure, coupled to the signal and operating on the sequence of samples, for providing an output and a first previous output, said output proportional to a combination of the current sample of the signal and the first previous output weighted by a sinusoidal function, less a second previous output, said sinusoidal function having an argument corresponding to a frequency representative of the symbol, and a combiner coupled to said output and said first previous output for providing a DTFT signal proportional to a DTFT evaluated at said frequency representative of the symbol for said sequence of samples. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification