DSP-based variable aperture code generation technique
AssigneeThomson Licensing
InventorsMichael David Zoltowski, Gregory John Tomezak, James Vincent Krogmeier, Chandra Mohan, Zhiming Zhang
Life of this patent
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Abstract
Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor (12) that yields a VAC signal having a single narrow in the positive frequency region. A Discrete-Time Hilbert transformer (12) isolates the only the positive spectral peaks, thus yielding a VAC signal that affords greater control over zero crossings.
Claims20
Apparatus for generating a single side band (SSB) variable aperture coded (VAC) signal, comprising:
- a digital signal processor (12) for generating a discrete time VAC signal which has a sinusoidal shape and a spectral peak in appositive frequency range;
- and
- means (14) for isolating the positive spectral peak and a portion of surrounding spectrum in the VAC signal generated by the digital signal processor.
A method for generating a single side band (SSB) variable aperture coded (VAC) signal, comprising the steps of:
- digitally generating a discrete time VAC signal which has a sinusoidal shape and a spectral peak in appositive frequency range;
- and
- isolating the positive spectral peak and a portion of surrounding spectrum in the digitally generated VAC signal.
Dependencies are inferred from the claim text.