Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-06-12
2000-05-02
Young, Brian
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
H03M 300
Patent
active
060577932
ABSTRACT:
An analog-to-digital converter is provided for producing digital signal representative of analog signals. Noise induced upon the digital signals can be substantially removed using a digital decimation filter. The decimation filter includes a front-end portion which receives the digital data at a relatively high sample rate and performs filtering operations with minimal complexity. Preferably, the front-end portion includes at least one stage of filtering and more preferably at least two filter stages, each of which perform interpolation separate from decimation. According to one embodiment, the first stage of the front-end portion involves decimation and the latter stage or stages of that portion involves a combination of interpolation and decimation. The cumulative effect is to reduce the sample rate of the incoming data stream produced by, for example, a quantizer to a value which can be more easily manipulated by the back-end portion of the digital decimation filter. The front-end portion can therefore reduce the data rate change factor K to a smaller, fixed integer data rate change factor K.sub.1, regardless of whether data rate change factor K is an integer number or involves a fractional number.
REFERENCES:
patent: 4851841 (1989-07-01), Sooch
patent: 5079734 (1992-01-01), Riley
patent: 5220327 (1993-06-01), Abbiate
patent: 5455782 (1995-10-01), Young et al.
patent: 5646621 (1997-07-01), Cabler et al.
patent: 5654711 (1997-08-01), Fujimori
Chu et al., "Multirate Filter Designs Using Comb Filters," IEEE Transactions on Circuits and Systems, vol. CAS-31, No. 11, Nov. 1984, pp. 405-416.
Franca et al., Design of Analog-Digital VLSI Circuits for Telecommunications and Signal Processing, Second Edition, Prentice Hall 1994, pp. 251-288.
Dupuis Tim J.
Gong Xue-Mei
Lu Jinghui
Titizer Korhan
Daffer Kevin L.
Oak Technology, Inc.
Young Brian
LandOfFree
Digital decimation filter and method for achieving fractional da does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital decimation filter and method for achieving fractional da, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital decimation filter and method for achieving fractional da will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1597064