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US 5,489,903 AGranted
Digital to analog conversion using non-uniform sample rates
AssigneeAnalog Devices, Inc.
InventorsJames Wilson, Ronald A. Cellini, James M. Sobol
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AssigneeAnalog Devices, Inc.
InventorsJames Wilson, Ronald A. Cellini, James M. Sobol
Estimating the term…
A method and apparatus for digital to analog conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base such that errors produced by non-uniform sampling are frequency-shaped to a region (i.e., shifted to higher frequencies) where they can be removed by conventional filtering techniques. In one embodiment, the digital data is interpolated by a fixed ratio and then decimated under control of a sigma-delta modulated frequency selection signal that represents, on average, the data rate of the incoming digital data stream. The frequency signal selection number is modulated using an n-th order m-bit sigma-delta modulator. Data thus emerges from the interpolation/decimation process at the clock rate of the n-th order m-bit sigma-delta modulator. The method and apparatus converts the data rate of the incoming digital data stream to the data rate of the n-th order m-bit sigma-delta modulator.
A digital to analog converter system, comprising:
A digital to analog converter system, comprising:
A method of converting a digital signal to an analog signal, comprising the steps of:
A method of converting a digital signal to an analog signal, comprising the steps of:
Dependencies are inferred from the claim text.