Alias tagging time domain to frequency domain signal converter
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United States of America Patent
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Jan 9, 1990
Issued Date -
N/A
app pub date -
Dec 12, 1988
filing date -
Jun 1, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal converter which inputs a time domain signal having a relatively large bandwidth and which outputs a frequency domain signal is disclosed. The time domain input signal is split into two identical portions. One portion is delayed relative to the other portion to produce an unambiguous relative phase shift which varies as a function of frequency. The two portions are sampled at a rate which is significantly below the Nyquist rate for the bandwidth. Two conventional discrete Fourier transforms (DFT) processors transform the two portions into two frequency domain data arrays. A post-DFT operation resolves the relative phase differences to expand the bandwidth which results from the low sampling rate and to eliminate aliasing.
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