Abstract: A system and method for reducing the noise induced in a particular section or level of a signal bandwidth. The section is isolated from the rest of the signal data, by rescaling this data to produce a buffer section adjacent the section with little or no data in it. The signal is then transmitted to the output device where all data is the buffer section is considered to be the result of noise, and is mapped back to the predetermined level. The signal data is inversely rescaled to move data back into the buffer section. In this way, more of the data that was input at the predetermined level, will also be at the predetermined level afterwards, thereby correcting noise induced in that level by noise inducing transmission techniques such as JPEG compression.

Abstract: A controller for a printhead is provided. The printhead has rows of printing nozzles with each nozzle row formed by adjacent sub-rows of printing nozzles of adjacently disposed printhead modules. Each nozzle row us arranged such that the join of the respective adjacent sub-rows is arbitrarily located relative to the other nozzle rows thereby forming an arbitrarily shaped join region. The controller being configured to determine the arbitrary shape of the join region and to supply dot data to the printhead which compensates for the determined arbitrary shape.

Abstract: A printer controller for controlling a printhead comprising at least one monolithic printhead module, the at least one printhead module having a plurality of rows of nozzles configured to extend, in use, across at least part of a printable pagewidth of the printhead, the nozzles in each row being grouped into at least first and second fire groups, the printhead module being configured to sequentially fire, for each row, the nozzles of each fire group, such that each nozzle in the sequence from each fire group is fired simultaneously with respective corresponding nozzles in the sequence in the other fire groups, wherein the nozzles are fired row by row such that the nozzles of each row are all fired before the nozzles of each subsequent row, wherein the printer controller is configured to provide one or more control signals that control the order of firing of the nozzles.

Abstract: A controller for a printhead is provided. The printhead has rows of printing nozzles with each nozzle row formed by adjacent sub-rows of printing nozzles of adjacently disposed printhead modules. Each nozzle row us arranged such that the join of the respective adjacent sub-rows is arbitrarily located relative to the other nozzle rows thereby forming an arbitrarily shaped join region. The controller being configured to determine the arbitrary shape of the join region and to supply dot data to the printhead which compensates for the determined arbitrary shape.

Abstract: A printer includes a printhead having first and second elongate printhead modules; and first and second printer controllers receiving print data and processing the print data to output dot data to the printhead, the first printer controller outputting dot data to the first printhead module and the second printer controller outputting dot data to the second printhead module. The first elongate printhead module is informationally isolated from the second elongate printhead module, whereby no dot data passes therebetween. The first printer controller and the second printer controller communicate therebetween a synchronization signal to effect synchronization therebetween.

Abstract: A printhead is provided which has a plurality of types of printheads modules. Each type of module is determined by its geometric shape in plan so that the combination of the determined module types forms the printhead to extend and print across a pagewidth. At least one row of printhead nozzles defined across the determined types of modules includes at least one displaced row portion.

Abstract: A printhead module comprising a plurality of rows, each of the rows comprising a plurality of nozzles for ejecting ink, wherein the printhead module includes at least first and second rows configured to print ink of a similar type or color, and being configured such that, in the event a nozzle in the first row is faulty, a corresponding nozzle in the second row prints an ink dot at a position on print media at or adjacent a position where the faulty nozzle would otherwise have printed it.

Abstract: A printhead is provided having elongate printhead modules arranged to aggregately extend across a pagewidth and controllers for processing print data into dot data and for controlling the printhead modules in accordance with the dot data. Each printhead module has plural rows of ink ejection nozzles. The nozzle rows of at least one of the printhead modules are longer than the nozzle rows of the other printhead modules. The controllers control ink ejection of the nozzles of the printhead modules in accordance with the dot data. At least one of the controllers is arranged to control all of the printhead modules and at least one other of the controllers is arranged to control only one of the printhead modules.

Abstract: A printer controller for providing data to a printhead module that includes: at least one row of print nozzles; at least first and second shift registers for shifting in dot data supplied from a data source, wherein each shift register feeds dot data to a group of nozzles, and wherein each of the groups of the nozzles is interleaved with at least one of the other groups of the nozzles.

Abstract: A method for arbitrating between a plurality of access requests issued in relation to a resource by a plurality of requestors, wherein each request can be one of at least two types, a first of the types having a higher latency associated with its performance than at least some of the other types, the method including the steps of: (a) receiving a plurality of the access requests; (the requests are not placed anywhere, they are simply received); (b) maintaining a current pointer that points to a current timeslot in a timeslot list, and at least one lookahead pointer that points to a future timeslot in the timeslot list; and (c) in the event an access request as arbitrated via the lookahead pointer is of the first type, initiating performance of the access request earlier than the position in the list suggests it would be performed should it be started when the current pointer reached the timeslot.

Abstract: A print cartridge is disclosed. The print cartridge has at least one ink reservoir, a storage means configured to store information indicative of an amount of printing achievable by the cartridge based on the amount of ink in the at least one ink reservoir, the information being stored in the form of a plurality of bits, the storage means including a plurality of first fusible links, each of the first fusible links storing one of the bits, an information changing mechanism for changing a value of the information by selectively blow one or more of the first fusible links each time a predetermined amount of ink is consumed, and a printhead having a second fusible link which destructs the printhead in response to the value of the information reaching a predetermined threshold.

Abstract: A method of accounting for dead nozzle remapping in a multi-nozzle printhead includes defining a first fixative plane and a second fixative plane; determining a first color plane requiring the fixative; determining if fixative is present in the first color plane; determining if the first color plane is dead; and adding fixative to a second color plane when it is determined that the first color plane is dead.

Abstract: A printer includes a printhead having first and second elongate printhead modules; and first and second printer controllers receiving print data and processing the print data to output dot data to the printhead, the first printer controller outputting dot data to the first printhead module and the second printer controller outputting dot data to the second printhead module. The first elongate printhead module is informationally isolated from the second elongate printhead module, whereby no dot data passes therebetween. The first printer controller and the second printer controller communicate therebetween a synchronization signal to effect synchronization therebetween.

Abstract: A printhead is provided having elongate printhead modules arranged parallel to each other to extend across a pagewidth and controllers for processing print data into dot data and for controlling the printhead modules in accordance with the dot data. Each printhead module has plural ink ejection nozzles. At least one of the printhead modules is longer than the other printhead modules. The controllers control ink ejection of the nozzles of the printhead modules in accordance with the dot data. At least one of the controllers is arranged to control all of the printhead modules and at least one other of the controllers is arranged to control only one of the printhead modules. Each controller has serial outputs for supplying the dot data for channels of the associated printhead module or modules.

Abstract: A printhead module comprising at least first and second rows configured to print ink of a similar type or color, at least some nozzles in the first row being aligned with respective corresponding nozzles in the second row in a direction of intended media travel relative to the printhead, the printhead module being configurable such that the nozzles in the first and second rows are fired such that some dots output to print media are printed to by nozzles from the first row and at least some other dots output to print media are printed to by nozzles from the second row.

Abstract: A replaceable print cartridge for installation in a mobile device, the print cartridge comprising: a printhead; at least one ink reservoir; storage means configured to store information indicative of an amount of printing that can be achieved by the cartridge based on the amount of ink in the at least one ink reservoir; and an information changing mechanism for changing a value of the information.

Abstract: A printer comprising: a printhead comprising first and second elongate printhead modules, the printhead modules being parallel to each other and being disposed end to end on either side of a join region; at least first and second printer controllers configured to receive print data and process the print data to output dot data to the printhead, wherein the first printer controller outputs dot data only to the first printhead module and the second printer controller outputs dot data only to the second printhead module, wherein the printhead modules are configured such that no dot data passes between them.

Abstract: Efficiently processing contone image data by determining one or more characteristics of the image data and using these characteristics to manipulate the dither matrix so that the printed image is enhanced.

Abstract: An integrated circuit is provided having a memory storing first and second strings of bit values, each bit value in the second string being the logical inverse of a bit value at a corresponding bit position in the first string, and a processor configured to test whether the bit values of the second string are the inverse of the bit values at respective corresponding bit positions of the first string by combining the corresponding bits of the first and second strings.

Abstract: A printer controller for supplying dot data to at least one printhead module, the at least one printhead module comprising a plurality of rows, each of the rows comprising a plurality of nozzles for ejecting ink, wherein the printhead module includes at least first and second rows configured to print ink of a similar type or color, the printer controller being configured to supply the dot data to the at least one printhead module such that, in the event a nozzle in the first row is faulty, a corresponding nozzle in the second row prints an ink dot at a position on print media at or adjacent a position where the faulty nozzle would otherwise have printed it.