1. A method for decoding address data of an optical disc drive for decoding an input wobble signal into an address data unit signal, the method comprising:
(a) converting a wobble carrier frequency signal output by a phase lock loop into a wobble carrier frequency signal with the same phase as the input wobble signal;
(b) multiplying the wobble frequency signal with the input wobble signal to obtain a product signal;
(c) accumulating the product signals at each clock to obtain a quotient summation signal; and
(d) determining phase changes of the input wobble signal according to the quotient summation signal to obtain a phase change signal;
(e) sequencing the values of the quotient summation signals at each clock, and selecting a plurality of clocks having smaller quotient summations in order to obtain a sync pattern; and
(f) comparing the sync pattern with a plurality of address data patterns, and using the address data pattern closest to the sync pattern as the address data unit signal.
2. The method of claim 1, wherein the optical disc drive is a DVD+RRW drive and the address data is address in pre-groove (ADIP).
3. A method for decoding address data of an optical disc drive for decoding an input wobble signal into an address data unit signal, the method comprising:
determining phase changes of the input wobble signal according to a quotient summation signal to obtain a phase change signal; and
comparing the phase change signal with the values of a plurality of address data patterns of each clock; when there is an address data pattern having the same value as the phase change signal, adding a count number to the address data pattern; and eventually using the address data pattern having the most count numbers as the address data unit signal.
4. The method of claim 3, wherein the optical disc drive is a DVD+RRW drive and the address data is address in pre-groove (ADIP).
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 unit cell arrangement for an inkjet printhead integrated circuit, said unit cell arrangement comprising:
a wafer substrate that defines an ink inlet;
sidewalls supporting a roof portion on a wafer substrate to form an ink chamber in fluid communication with the ink inlet, the roof portion defining at least one nozzle rim;
a heater element suspended in the chamber between the sidewalls for thermal cavitation of ink in said chamber to facilitate ink ejection via the nozzle rim; and
a rectifying valve arranged in the ink inlet to provide decreased hydraulic resistance to ink flowing into the chamber than ink flowing out of the chamber in order to reduce fluidic cross talk between chambers of similar unit cells on the substrate and to improve ink refill times of the chambers.
2. The unit cell arrangement of claim 1, having two nozzle rims defined in the roof portion over the heater element.
3. The unit cell arrangement of claim 1, having a lateral ink conduit defined by the substrate for supplying ink to the ink inlet.
4. The unit cell arrangement of claim 3, wherein the rectifying valve has a main conduit between a pair of smaller secondary conduits, with upstream openings of the secondary conduits arranged to face away from an inflow of ink so that relatively little of a main flow of ink from the lateral ink conduit is diverted into such secondary conduits.
5. The unit cell arrangement of claim 4, wherein the secondary conduits of the rectifying valve are configured to resist ink backflow from the chamber to the lateral ink conduit by the upstream openings of the secondary conduits arranged to face a flow direction in the main conduit so that flow from the secondary conduits constricts backflow through the main conduit.
6. The unit cell arrangement of claim 1 having a drive circuitry for providing actuator drive signals via a pair of electrodes to the heater element.
7. The unit cell arrangement of claim 6, wherein a trench etched into the drive circuitry extends between the electrodes.