Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-10-16
2007-10-16
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000
Reexamination Certificate
active
11478275
ABSTRACT:
A method and apparatus for implementing non-integer sample hold operations in a sigma-delta digital-to-analog converter system includes an interpolation filter, a polyphase filter circuit, and a modulator. The polyphase filter circuit is used to virtual upsample a digital input signal by a predetermined non-integer upsample ratio of a relatively large number. The polyphase filter circuit is formed of a long zero-order hold and a short FIR filter so that only several branches associated with the polyphase filter circuit corresponding to output samples immediately after a transition of the digital input signal is required to be calculated, thereby reducing the need to store a large number of filter coefficients and eliminating complex computations.
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Ronald E. Crochiere and Lawrence R. Rabiner, “Interpolation and Decimation of Digital Signals—A Total Review”, Proceeding of the IEEE, Mar. 1981, p. 300-331,vol. 69, No. 3.
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Ding Lei
Duewer Bruce
Fei Xaiofan
Melanson John L.
Chin Davis
Cirrus Logic Inc.
Jean-Pierre Peguy
Lin Steven
Thomas Gregory S.
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