Nyquist band frequency translation
AssigneeLucent Technologies Inc.
InventorMichael McCarthy, Jr.
Life of this patent
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Abstract
There is disclosed a method of processing a signal which comprises sampling the signal at a sampling frequency. Discrete time components at the sampling interval are thereby generated. Inverting alternate ones of the discrete time components thereby translates a frequency component of the sampled signal in one part of the Nyquist band to another part of the Nyquist band. The step of inverting alternate ones of the discrete time components is shown to comprise multiplying the sampled signal by a reference signal at half the sampling frequency and having discrete time components at the sampling interval. Circuitry for implementing the method is also disclosed.
Claims12
A method of processing a signal, comprising sampling the signal at a sampling frequency thereby generating discrete time components at the sampling interval;
- and inverting alternate ones of the discrete time components thereby translating a frequency component of the sampled signal in one part of the Nyquist band to another part of the Nyquist band, in which a frequency component in the upper half of the Nyquist band is translated to a lower half of the Nyquist band or a frequency component in the lower half of the Nyquist band is translated to the upper half of the Nyquist band.
A signal processing circuit comprising an input circuit connected to receive a signal;
- a sampling circuit connected to the input circuit and for sampling the signal at a sampling frequency to thereby generate discrete time components at the sampling interval;
- and inverting means connected to receive the sampled output and for inverting alternate ones of the discrete time components, whereby a frequency component of the sampled signal in one part of the Nyquist band is translated to another part of the Nyquist band, in which a frequency component in the upper half of the Nyquist band is translated to a lower half of the Nyquist band and a frequency component in the lower half of the Nyquist band is translated to the upper half of the Nyquist band.
Dependencies are inferred from the claim text.