Boots – shoes – and leggings
Patent
1989-06-19
1991-04-23
Malzahn, David H.
Boots, shoes, and leggings
G06F 1531
Patent
active
050105060
ABSTRACT:
A direct digital synthesizer that outputs at least a predetermined output frequency related signal from a received digital signal, K, with minimum spurious signal levels. A storage device stores an initial phase value of the digital signal, K, and provides the initial phase value on an output thereof. An adder is provided having a first input for receiving the digital signal, K, having a second input and having an output which provides a summation of signals received on the first and second inputs. A latch has a first input connected to the output of the storage device, has a second input connected to the output of the adder and an output connected to the second input of the adder. The latch also has a third input for receiving a select signal for selecting between receiving on the first and second inputs of the latch. A control circuit provides the select signal in response to one of a plurality of predetermined parameters. The output frequency related signal is provided on the output of the latch. One or more detectors identify a power interrupt of the direct digital synthesizer or a change in the digital signal, K, and provides a detect signal to the control circuit. When a power interrupt or change in K is detected, the control circuit causes the latch to first receive the initial phase value on the first input thereof and then switch to the second input thereof for subsequent operations.
REFERENCES:
patent: 3633017 (1972-01-01), Crooke et al.
patent: 4328554 (1982-05-01), Mantione
patent: 4476536 (1984-10-01), Jones, Jr.
Hamann H. Fredrick
Horn John J.
Malzahn David H.
Murrah M. Lee
Rockwell International Corporation
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