Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2007-05-22
2007-05-22
Pezzlo, John (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S487000, C375S350000
Reexamination Certificate
active
10210143
ABSTRACT:
A method for processing a composite digital audio broadcasting signal including an analog modulated portion in a central frequency band and digitally modulated portions in upper and lower sidebands with respect to the central frequency band, the method comprises the steps of wideband filtering the composite digital audio broadcasting signal to produce a first intermediate frequency signal, narrowband filtering the composite digital audio broadcasting signal to produce a second intermediate frequency signal, simultaneously processing the first intermediate frequency signal to retrieve a digitally modulated version of program material from the first intermediate frequency signal, and processing the second intermediate frequency signal to retrieve an analog modulated version of the program material from the second intermediate frequency signal, making a determination of the quality of the digitally modulated version of the program material, and using the quality determination to select the analog modulated version of the program material, the digitally modulated version of the program material, or a combination of the analog modulated version of the program material and the digitally modulated version of the program material as an output signal. Receivers that process a digital audio broadcasting signal using the method are also disclosed.
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iBiquity Digital Corporation
Lenart, Esq. Robert P.
Pezzlo John
Pietragallo Bosick & Gordon LLP
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