1. A quadrature clock generating apparatus comprising:
a multiplexer selecting one of a generated clock and a gated generated clock as a double clock in accordance with a halt multiplexer control, wherein the double clock has a frequency twice that of a reference clock;
divider circuitry coupled to provide an alignment signal corresponding to an inverted double clock divided by two;
a recovery circuit for recovering a first clock and a second clock from the double clock in accordance with the alignment signal, wherein the first and second clocks have substantially a 90\xb0 phase difference; and
a halt circuit controlling the halt multiplexer control to select the gated generated clock when the alignment signal matches a pre-determined clock level, wherein the halt multiplexer control is clocked by the generated clock.
2. The apparatus of claim 1 wherein the recovery circuit comprises:
a first flip-flop receiving the alignment signal, wherein the first flip-flop is clocked by the double clock to provide the first clock; and
a second flip-flop receiving the first clock, wherein the second flip-flop is clocked by an inverted double clock to provide the second clock.
3. The apparatus of claim 2 wherein each of the first and second flip-flops is a D-type flip-flop.
4. The apparatus of claim 1 further comprising a phase locked loop to provide the generated clock.
5. The apparatus of claim 1 wherein the divider circuitry further comprises:
an inverter coupled to provide an inverted double clock; and
a divider coupled to divide the inverted double clock to provide the alignment signal.
6. The apparatus of claim 1 wherein the clock generator, divider, and recovery circuitry reside on a same integrated circuit die.
7. The apparatus of claim 6 wherein the clock generator, divider and recovery circuitry are formed as a metal oxide semiconductor field effect transistor (MOSFET) integrated circuit.
8. A quadrature clock generation apparatus, comprising:
a multiplexer selecting one of a generated clock and a gated generated clock as a double clock in accordance with a halt multiplexer control, wherein the double clock has a frequency twice that of a reference clock;
divider circuitry coupled to provide an alignment signal corresponding to an inverted double clock divided by two;
a plurality of recovery circuits, each recovery circuit deriving an instance of a first clock and an instance of a second clock from the double clock in accordance with the alignment signal, wherein the first and second clocks associated with each recovery circuit have substantially a 90\xb0 phase difference; and
a halt circuit controlling the halt multiplexer control to select the gated generated clock when the alignment signal matches a pre-determined clock level, wherein the halt multiplexer control is clocked by the generated clock.
9. The apparatus of claim 8 wherein the first clock associated with any recovery circuit is substantially synchronized with the first clock associated with any other recovery circuit.
10. The apparatus of claim 8 wherein each recovery circuit comprises:
a first flip-flop receiving the alignment signal, wherein the first flip-flop is clocked by the double clock to provide the first clock; and
a second flip-flop receiving the first clock, wherein the second flip-flop is clocked by an inverted double clock to provide the second clock.
11. The apparatus of claim 10 wherein each of the first and second flip-flops is a D-type flip-flop.
12. The apparatus of claim 8 further comprising a phase locked loop to provide the generated clock, wherein each instance of the first and second clocks has a same frequency as the reference clock, wherein each instance of the first clock is synchronized with the reference clock.
13. The apparatus of claim 8 wherein the divider circuitry further comprises:
an inverter coupled to provide an inverted double clock from the double clock; and
a divider coupled to divide the inverted double clock to provide the alignment signal.
14. The apparatus of claim 8 wherein the clock generator, divider, and recovery circuitry reside on a same integrated circuit die.
15. The apparatus of claim 14 wherein the clock generator, divider and recovery circuitry are formed as a metal oxide semiconductor field effect transistor (MOSFET) integrated circuit.
16. A method of generating a quadrature clock, comprising:
selecting one of a generated clock and a gated generated clock as a double clock in accordance with a halt multiplexer control, wherein the double clock has a frequency twice that of a received reference clock;
generating an alignment signal corresponding to an inverted double clock divided by two;
deriving a plurality of instances of a first clock and an associated second clock from the double clock in accordance with the alignment signal, wherein each first and associated second clock instance have a 90\xb0 relative phase difference; and
controlling the halt multiplexer control to select the gated generated clock when the alignment signal matches a pre-determined clock level, wherein the halt multiplexer is clocked by the generated clock.
17. The method of claim 16 wherein deriving each instance of the first clock includes latching the alignment signal in accordance with the double clock to provide the first clock, wherein deriving the each instance of the second clock includes latching the associated first clock in accordance with an inverted double clock to provide the second clock.
18. The method of claim 16 further comprising:
providing differential distribution of the double clock.
19. The method of claim 16 further comprising:
stepping the gated generated clock to step the first and second clock instances through the quadrature clock cycles
20. The method of claim 16 wherein deriving each instance of the first clock further comprises providing the alignment signal to a first latch, wherein the first latch is clocked by the double clock to provide that instance of the first clock.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fluid-containing lens filter for modifying images in photographic, video and motion picture cameras comprising,
a) a filter housing having a front plate, a back plate with a bottom edge and a pair of opposed side edges juxtaposed between the front plate and back plate, said filter housing having a void remaining between the front plate and the back plate, wherein said bottom edge and said side edges are bonded to the front and back plates to form a fluid tight chamber within the filter housing, and
b) a fluid having light modifying qualities disposed within said chamber such that color, translucency and clarity are altered to create a supplementary visual effect on an image viewed by the camera.
2. The fluid-containing lens filter as recited in claim 1 wherein said front plate, back plate, side edges and bottom edge are formed of glass.
3. The fluid-containing lens filter as recited in claim 1 wherein said front plate, back plate, side edges and bottom edge are formed of optically clear thermoplastic.
4. The fluid-containing lens filter as recited in claim 1 wherein said front plate and said back plate of said filter housing have a square shape.
5. The fluid-containing lens filter as recited in claim 4 wherein said filter housing front plate and back plate further comprising an overall dimension of 6.6 by 6.6 inches square (16.8 by 16.8 cm) and 0.5 inches (1.27 cm) deep, wherein the square size used by a conventional cinematographers in most industry standard systems.
6. The fluid-containing lens filter as recited in claim 1 wherein said filter housing side edges and bottom edge further comprise a square configuration.
7. The fluid-containing lens filter as recited in claim 1 wherein said front and back plates further comprise a relationship that is wider on one side of the filter than the other permitting denser filtration at one side of a filter to attenuate the image viewed by the camera.
8. The fluid-containing lens filter as recited in claim 1 wherein said wherein said filter housing bottom edge and said filter housing side edges are bonded to the front plate and back plate selected from the group consisting of adhesive, ultrasonic welding, heat welding which includes elevating the temperature of the edges of the plates to form a homogeneous mass, and chemically melting the side and bottom edges to the plates into a common mass, when solidified.
9. The fluid-containing lens filter as recited in claim 1 wherein said fluid further comprises a color pigment in suspension.
10. The fluid-containing lens filter as recited in claim 1 wherein said fluid further includes a plurality of particles within the fluid having sufficient viscosity to suspend the particles therein.
11. The fluid-containing lens filter as recited in claim 11 wherein said fluid particles further comprise a glitter means that reflect light.
12. The fluid-containing lens filter as recited in claim 11 wherein said fluid particles further comprise a sublimated means which alters the image viewed by the camera.
13. The fluid-containing lens filter as recited in claim 11 wherein said fluid particles further comprise a buoyant means which permits the particles to float and to be randomly suspended in the fluid.
14. The fluid-containing lens filter as recited in claim 1 wherein said fluid further comprises means to change its color.
15. The fluid-containing lens filter as recited in claim 1 wherein said fluid further comprises chemical means for creating a reaction when at least two chemicals are combined to create a dynamic anomaly in the clarity of the filter.
16. The fluid-containing lens filter as recited in claim 1 wherein said fluid further comprises two discrete fluids that are not miscible with each other to create dissimilar images.
17. The fluid-containing lens filter as recited in claim 1 further comprising a top which is sealed to said front plate and back plate after said chamber is filled with said fluid.
18. The fluid-containing lens filter as recited in claim 1 further comprising a removable top disposed within said chamber between a top of said front plate and back plate to retain the fluid within in a leak-proof manner.
19. The fluid-containing lens filter as recited in claim 1 further comprising a light source that provides a beam of light on a surface selected from the group consisting of said front and back plate top, bottom edge, one side edge, both side edges, both front and back plate top and bottom and combined on said front and back plate top, bottom and side edges.