Coded data generation or conversion – Digital code to digital code converters – Data rate conversion
Reexamination Certificate
2007-06-05
2007-06-05
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
Data rate conversion
C341S144000
Reexamination Certificate
active
11289923
ABSTRACT:
A digital modulator having a sample rate converter that does not require that the final output sampling rate, FOUT, of the sample rate converter be at least twice as great as the input sampling rate, FIN, of the sample rate converter. The upsampling interpolation filter stages of the sample rate converter of the invention do not require any reference clocks to be provided by the NCO of the sample rate converter. Therefore, the upsampling interpolation filter stages are decoupled from the final output sampling rate, FOUT. The interpolation algorithms may be implemented in software, hardware, or a combination of software and hardware. In addition, the polynomial-based interpolator of the Farrow Structure of the invention is capable of using an even or odd number of basepoints.
REFERENCES:
patent: 5365182 (1994-11-01), King
patent: 5907295 (1999-05-01), Lin
patent: 6057789 (2000-05-01), Lin
“A Frequency-Agile Single Chip QAM Modulator With Beamforming Diversity”; Kyung-Ho Cho and Henry Samueli; IEEE Journal of Solid-State Circuits, USA; vol. 36, No. 3, Mar. 2001.
Cullen Larry T.
General Instrument Corporation
Jean-Pierre Peguy
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