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Digital carrier demodulator employing components working beyond normal limits
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1990 |
| Description | In a digital device, having an input comprised of a digital sample stream at a frequency F, a method is disclosed for employing a component designed to work at a frequency less than F. The method, in general, is comprised of the following steps: dividing the digital sample stream into odd and even digital samples streams each at a frequency of F/2; passing one of the digital sample streams through the component designed to work at a frequency less than F where the component responds only to the odd or even digital samples in one of the digital sample streams; delaying the other digital sample streams for the time it takes the digital sample stream to pass through the component; and adding the one digital sample stream after passing through the component with the other delayed digital sample streams. In the specific example, the component is a finite impulse response filter of the order ((N + 1)/2) and the delaying step comprised passing the other digital sample streams through a shift register for a time (in sampling periods) of ((N + 1)/2) + r, where r is a pipline delay through the finite impulse response filter. |
| File Size | 520866 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920012469 |
| Archival Resource Key | ark:/13960/t22c3xc9b |
| Language | English |
| Publisher Date | 1990-08-07 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Demultiplexing Low Pass Filters Digital Techniques Inventions Signal Processing Sampling Digital Filters Analog To Digital Converters Demodulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
