Coded data generation or conversion – Digital code to digital code converters – Data rate conversion
Reexamination Certificate
2006-10-31
2006-10-31
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
Data rate conversion
C341S058000
Reexamination Certificate
active
07129861
ABSTRACT:
An up-sampled data stream, upsampled times a factor P, is generated by the input block providing signal samples having a frequency rate, while an intermediate data stream is generated by a Rate Adapting Stage providing signal samples adapted to an intermediate frequency rate. An output data stream is delivered by a final low pass filter, and includes M signal samples having a desired output sample frequency rate (fOUT=M/Ts). The method provides generation of a provisional stream in the Rate Adapting Stage, wherein this provisional stream is affected by aliases falling within the output Nyquist band [−fOUT/2, fOUT/2], although being adapted to the output frequency rate by a direct insertion of zero samples into the processed stream when L<M, or by a direct cancellation of samples when L>M. Then these aliases are suppressed in the Rate Adapting Stage by weighting the provisional stream via a set of weights.
REFERENCES:
patent: 5907295 (1999-05-01), Lin
patent: 6275836 (2001-08-01), Lu
patent: 6362755 (2002-03-01), Tinker
patent: 6489901 (2002-12-01), Venkitachalam et al.
patent: 6542094 (2003-04-01), Venkitachalam et al.
patent: 6570514 (2003-05-01), Velazquez
patent: 6608572 (2003-08-01), Venkitachalam et al.
patent: 6642863 (2003-11-01), Venkitachalam et al.
patent: 0 561 067 (1993-09-01), None
patent: 0 657 999 (1995-06-01), None
Chia-Chuan Hsiao, “Polyphase Filter Matrix for Rational Sampling Rate Conversions”, Int'l Conference on Acoustics, Speech & Signal Processing, Dallas, Apr. 6-9, New York, IEEEE, USA, vol. 4, Conf. 12, pp. 2173-2176, Abstract XP-000925119, 1987.
Ronald Crochiere et al., “Interpolation and Decimation of Digital Signals—A Tutorial Review”, Proceedings of the IEEEE, New York, USA; vol. 69, No. 3 dated Mar. 1, 1981, pp. 300-331; Abstract XP 000615159.
Wan H. Yim,Distortion Analysis for Multiplierless Sampling Rate Converion Using Linear Transfer Functions, IEEE Signal Processing Letters, vol. 8, No. 5, May 2001, pp. 143-144.
Accent S.p.A.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Jorgenson Lisa K.
Mai Lam T.
LandOfFree
Method for implementing a fractional sample rate converter... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for implementing a fractional sample rate converter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for implementing a fractional sample rate converter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3640618