Wide-band signal processor
First Claim
1. A signal processor for processing a digital input signal comprising samples sampled at a sampling frequency, the signal processor comprising:
- a plurality of filters arranged to divide the digital input signal into a first signal in a first frequency band below a first cut-off frequency, and a second signal in a second frequency band above a second cut-off frequency;
first frequency shifting circuitry arranged to shift the second signal to a frequency band below the first cut-off frequency;
decimation circuitry arranged to decimate the first signal to generate a first decimated signal and the second frequency shifted signal to generate a second decimated signal, the first and second decimated signals having samples at most at half the sampling frequency of the digital input signal, wherein the decimation circuitry is arranged to receive the second frequency shifted signal from the first frequency shifting circuitry; and
processing circuitry arranged to process the decimated first and second signals.
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Accused Products
Abstract
A signal processor for processing a digital input signal including samples sampled at a sampling frequency, the signal processor comprising a plurality of filters arranged to divide the digital input signal into a first signal in a first frequency band below a first cut-off frequency, and a second signal in a second frequency band above a second cut-off frequency; first frequency shifting circuitry arranged to shift the second signal to a frequency band below the first cut-off frequency; decimation circuitry arranged to decimate the first signal and the shifted second signal; and processing circuitry arranged to process the decimated first and second signals.
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Citations
27 Claims
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1. A signal processor for processing a digital input signal comprising samples sampled at a sampling frequency, the signal processor comprising:
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a plurality of filters arranged to divide the digital input signal into a first signal in a first frequency band below a first cut-off frequency, and a second signal in a second frequency band above a second cut-off frequency; first frequency shifting circuitry arranged to shift the second signal to a frequency band below the first cut-off frequency; decimation circuitry arranged to decimate the first signal to generate a first decimated signal and the second frequency shifted signal to generate a second decimated signal, the first and second decimated signals having samples at most at half the sampling frequency of the digital input signal, wherein the decimation circuitry is arranged to receive the second frequency shifted signal from the first frequency shifting circuitry; and processing circuitry arranged to process the decimated first and second signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of processing a digital input signal comprising samples sampled at a sampling frequency, the method comprising:
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dividing, by a plurality of filters, the digital input signal into a first signal in a first frequency band below a first cut-off frequency, and a second signal in a second frequency band above a second cut-off frequency; shifting by first frequency shifting circuitry the second signal to a frequency band below the first cut-off frequency; performing decimation by decimation circuitry on the first signal to generate a first decimated signal and on the second frequency shifted signal to generate a second decimated signal, the first and second decimated signals having samples at most at half the sampling frequency of the digital input signal, wherein decimation of the second frequency shifted signal follows shifting of the second signal to a frequency band below the first cut-off frequency; and processing, by processing circuitry, the decimated first and second signals. - View Dependent Claims (15)
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16. A signal processor comprising:
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a first filter configured to select from a digital input signal a first signal in a first frequency band below a first cut-off frequency; a second filter configured to select from the digital input signal a second signal in a second frequency band above a second cut-off frequency; a first frequency shifting circuit configured to shift the second signal to a frequency band below the first cut-off frequency; a first decimation circuit configured to decimate the first signal to generate a first decimated signal; a second decimation circuit configured to receive the frequency shifted second signal from the first frequency shifting circuit and to decimate the frequency shifted second signal to generate a second decimated signal, the first and second decimated signals having samples at most at half a sampling frequency of the digital input signal; and a processing circuit configured to process the first and second decimated signals. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for signal processing comprising:
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selecting from a digital input signal a first signal in a first frequency band below a first cut-off frequency; selecting from the digital input signal a second signal in a second frequency band above a second cut-off frequency; frequency shifting the second signal to a frequency band below the first cut-off frequency; decimating the first signal to generate a first decimated signal; decimating the frequency shifted second signal to generate a second decimated signal, the first and second decimated signals having samples at most at half a sampling frequency of the digital input signal; and processing the first and second decimated signals. - View Dependent Claims (24, 25, 26, 27)
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Specification