Eastman-kodak Company

Nexpress Solutions, Inc.

Intellectual Ventures Fund 83 LLC

William L Chapman

Shawn Edward O'Hara

Yee S Ng

Hieu T Pham

A computer-implemented method of communicating message data in a frame of data includes transmitting the frame of data across a communication channel. The frame of data includes the message data, a first 8-bit digital control word, and a second 8-bit digital control word. Each control word has a unique bit pattern and is associated with a different time interval that individually indicates where or when the message data begins or began in the frame of data relative to the time interval's associated control word. At least one of the control words and other data are received. At least some of the other data are identified as the message data based upon receipt of at least one of the control words. Only one of the control words needs to be received to identify the message data from the other data.

Robustness improvement for bandwidth communication system

A method and system to improve the retention of synchronization between the transmitter and receiver of image data across a communication channel. If the control character designating the end of the line of data is corrupted, the receiving system will not recognize that the line of data has ended and will continue as if data is still being received. The corruption of a single bit in the control character will cause the receiver to misinterpret the end of line control word. Since the receiving logic does not realize the transmitter is no longer sending data, erroneous data will be stored in the storage elements. By using an alternate control character as an additional end of line indicator, the receiver will terminate the line of data and will wait for the next start of line control character from the transmitter. Synchronization between the transmitter and receiver across the communication channel is thus maintained.

Retaining channel synchronization through use of alternate control characters

A method and apparatus for the transmission of multiple control characters of the same type to a receiver to improve the retention of transmitter to receiver synchronization in a noisy environment having receiver code that is less complex and does not require an increase in the bandwidth of the system since the control codes are already utilized to initiate other functions. Detection of any of the control characters of the same type by the receiver allows the receiver to maintain proper synchronization. The receiver will detect these control signals and anticipate the occurrence of an event within a predetermined time period.

Robustness improvement for bandwidth limited communication system

System and method for maintaining synchronized data transfer using a plurality of different control words individually indicative of the same single event

A product and process for an LED printhead used in electrophotographic printing that generates an exposure clock on the printhead for the LEDs. The present invention provides a high-speed interface that transmits print data that has been modified, or corrected, using the corresponding unique printhead brightness data as the base reference source data to the printhead boards. The corrected print data is then applied to the LED drivers that expose each LED simultaneously and uniquely. A non-linear clock is applied to the LED drivers as the reference clock to create the unique LED on time circuit. An Exposure RAM stores the data as parallel 8-bit data. A LATCH code received at an ASIC converts the Exposure RAM data into a serial bit stream. The preferred embodiment employs a 60 MHz clock, however, it should be readily apparent that numerous other clocking speeds can be employed. From this a linear or non-linear clock stream is created allowing 256 unique (linear or non-linear) exposure on times to the printhead driver circuitry. This is accomplished with a non-linear clock stream which allows a unique period for each clock period which then allows each increment of exposure time to be unique.

Multiple-level printhead using embedded high speed serial data and control link with on-board exposure clock generation

Increasing the linearity of elements within a printhead by applying a coarse electronic adjustment to rearrange the electronic printing of data into the proper pixel line and then applying a fine electronic adjustment to reduce the bow error to fraction of a pixel line. Delays of exposure control signals are used by the fine electronic adjustment to correct linearity by a fraction of a pixel line. The delays can be repeated to multiply the number of delays available and increase the linearity resolution. The delays can also be averaged between odd and even rows of elements to increase apparent resolution.

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Hemlock, NY, United States of America

William L Chapman