Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-08-03
1992-01-28
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307262, 307511, 328151, H03B 1900
Patent
active
050846817
ABSTRACT:
In direct digital synthesizers in the prior art, the output signal maintains a phase continuity whenever it switches, or hops, frequency. This phase continuity shows up as a smooth change in phase from one frequency to the next; the phase of the last frequency transitions into the phase of the new frequency without any discernable disruption. Thus, whenever the output signal returns to a switched frequency that it previously has, the output signal at the newly returned switched frequency has a new phase relative to its previous one at that frequency. For some applications, like simulating continuous different frequency sources, this phase continuity is not desirable. To overcome this disadvantage, the preferred embodiment of the present invention provides phase memory to a direct digital synthesizer so that regardless of the frequency that the output signal switches to, the output signal at that frequency is able to maintain a constant phase relative to a reference system clock pulse. In other words, switching and returning the synthesizer output signal to a selected frequency does not change the phase of the output signal at that frequency; the output signal at each frequency has the same constant phase as it has previously at that frequency. As a result, the synthesizer in accordance with the present invention appears to have a source of numerous continuous oscillators to which it can switch for a number of different frequencies, each having a constant phase.
REFERENCES:
patent: 3792360 (1972-08-01), Carlow
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4157500 (1979-06-01), Nicoli
patent: 4573017 (1986-02-01), Levine
patent: 4737724 (1988-04-01), Porrot
patent: 4792914 (1988-12-01), Dartois et al.
patent: 4812771 (1989-03-01), Lauper et al.
patent: 4835481 (1989-05-01), Geissler et al.
patent: 4866394 (1989-09-01), Okano et al.
patent: 4868428 (1989-09-01), Cooper
patent: 4878027 (1989-10-01), Carp et al.
patent: 4975660 (1990-12-01), Svenson
patent: 5019785 (1991-05-01), Fognini et al.
patent: 5028887 (1991-07-01), Gilmore
patent: 5051702 (1991-09-01), Iwasaki
Hassun Roland
Kovalick Albert W.
Cunningham Terry D.
Hewlett--Packard Company
Miller Stanley D.
Wong Edward Y.
LandOfFree
Digital synthesizer with phase memory 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 synthesizer with phase memory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital synthesizer with phase memory will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1863126