Canon Kabushiki Kaisha

Yukihiko Ogata

Takuji Nakatsuma

Masami Kato

Koji Harada

Hiroyuki Nakanishi

Isamu Ozawa

Takeshi Shinomiya

Akihito Mochizuki

Seijiro Yanase

Takashi Takeda

Masamichi Tateoka

Asao Watanabe

Yoji Kaneko

Tomoyuki Haganuma

Yoshio Yoshiura

Naoto Kagami

Kosuke Kunishi

Asao Wantanabe

A printer emulating apparatus obtains a command signal which is outputted from a controller unit via an interface, and emulates a state of an engine unit in accordance with a notification of an elapsed time by a timer for notifying the elapse of a predetermined time and the obtained command signal. A response signal is transmitted via the interface in accordance with the emulated state of the engine unit and the obtained command signal. An image sync signal is generated to the controller unit in accordance with the emulated state of the engine unit.

Printing apparatus and method for verifying a printer controller

In case of developing an image output apparatus including a controller to generate image data and an engine to form an image on a medium based on the image data, in order to verify the image data from the controller in real time, halftone image data before conversion into a PWM signal is converted into a serial signal and output instead of the PWM signal for output to the engine unit if a controller operation verification apparatus is used instead of the engine unit. Thus, multivalued halftone data not including an error due to a conversion process can be sent to the controller operation verification apparatus without adding signal line and driver circuit dedicated for sending the multivalued halftone data, whereby it is possible to improve development efficiency of the image output apparatus by accurate verification of the output image data.

Print controller operation verification system

It is desired to utilize two (or more) non-contiguous areas in memory as though they formed a single continuous area. An end address of a first memory area and a start address of a second memory area are set in a setting means. When the address in an address counter reaches the end address of the first of the two (or more) memory areas, the address counter is controlled to jump directly to the start address of the second area. By virtue of this structure, it become possible to access the first and second areas successively, as one continuous area, even though the two areas are separated from each other in the memory space.

Memory controller having means for comparing a designated address with

In a communication system having a plurality of communication apparatus connected to at least one line, each communication apparatus has detection circuitry for detecting a call signal from the line to other communication apparatus and inform circuitry for informing such call or circuitry for altering such call to a call to its own apparatus.

Communication apparatus providing improved information on the states of

An image display control method for controlling an image display unit having a first memory for storing a plurality of images from a remote location through a predetermined line includes the steps of receiving first data for indicating an image to be displayed and second data indicating a time to display the image indicated by the first data through the predetermined line, and storing the received first data and second data in a second memory. In addition, the image indicated by the first data from the first memory is read when the time indicated by the stored second data is reached and the image on the image display unit is displayed.

Image processing apparatus having a remote communication function

In a communication system having a plurality of communication apparatuses that are connected to one line, each communication apparatus has a detection circuit for detecting a call signal from the line to another communication apparatus connected to the line. Each communication apparatus also has a circuit that informs the operator at the communication apparatus of such call signal or a device for altering such call signal to a call signal to the communication apparatus itself.

Communication apparatus for responding to calls to a different apparatus

A communication apparatus sends the address data of a destination, with or without sub-address data, to a digital line. The destination itself has at least one communication terminal capable of being specified, and the sub-address data corresponds to a specified one of this at least one communication terminal of the destination. When the communication apparatus sends the address data with the sub-address data to the digital line, the intention is to communicate with the specified communication terminal. The communication apparatus detects a response received through the digital line when the address data with the sub-address data has been sent thereto, and resends the address data without the sub-address data on the basis of the detection.

Communication apparatus with improved sub-address recall

Disclosed is a data processing apparatus which makes it possible to perform data processing at high speed by efficiently using a plurality of buses with a small number of microprocessors. The apparatus may be realized in the form of a facsimile apparatus including: a first bus connected to a microprocessor; a second bus which is not connected to the microprocessor; a memory connected to both the first and second buses; a memory control section which mediates between memory accesses from these buses so as to allow each of them to use the memory; a group of circuits for performing data processing through the second bus under the control of the microprocessor; and a DMA controller for effecting high-speed data transfer between each of the circuits and the memory.

Data processing apparatus dual-bus data processing with reduced cpu and

An image processing apparatus in which image data is input page by page. Non-coded image data and coded image data are generated from the input image data and are stored in an image memory. A controller controls storage of the data into the image memory, and selects which one of the non-coded image data and the coded image data are saved in the image memory based on the size of the coded image data.

Image processing apparatus

This disclosure relates to a facsimile apparatus connected to an ISDN and having a confirmation function by which an addressor is capable of confirming whether data transmitted by the addressor have reached the addressee with certainty. The apparatus on the transmitting side adds transmission management information to the transmission data and sends both the data and the additional information to an apparatus on the receiving side. Based on the received transmission management information, the apparatus on the receiving side responds by sending information indicating that it has assuredly received the data back to the apparatus on the transmitting side. Thus, transmission of the data is performed with assurance by exchange of management information between the apparatus on the transmitting and receiving sides. Also disclosed is a facsimile apparatus having a function in which a password on the receiving side is provided so that a specific individual can confirm certain receipt of data.

Facsimile apparatus

A data communication apparatus includes an analog communication unit for performing analog communication, an A/D converter for converting the analog signal from the analog communication unit into a digital voice signal, and an ISDN communication control unit for sending the digital voice signal from the A/D converter onto a digital communication line. Data used in an ISDN are voice data, image data, facsimile communication data, etc.

Data communication apparatus which can use either an analog or a digital

A communication interface for the protocol of a layer 1 using an ISDN digital communication network, includes: a first communication controller to execute the communication control for a standard terminal; a second communication controller to execute the communications control for a network terminal device; and a switch between to switch the first and second communication controllers. The first communication controller executes the control as a layer 1 of the ISDN standard terminal. The second communication controller executed the control as a layer 1 of the network terminal device which is connected to the ISDN. The communication interface can execute the two-way connection test separately from the ISDN network and can be used in three modes of the ISDN layer 1 interface, TE layer 1 interface, and NT layer 1 interface.

Communication interface

A resource sharing system including one or more resources, a plurality of resource access devices for accessing the resources, a priority order holder for holding a priority order for access competition between the resources and the resource access device, an ordering device for ordering the access competition in accordance with the priority order held in the holder, and priority order changer for raising the priority order of one access device if a low priority order access is not accepted by the one access device a predetermined number of times.

Memory controller including a priority order determination circuit

An image processing method comprising the step of converting a read image signal into an intermediate code which is then stored in an image memory. The method further includes the steps of reading out the stored intermediate code and converting the pixel density of the read-out intermediate code. Then, the intermediate code, the pixel density of which has been converted, is converted into a final code.

Image processing with compression encoding

A facsimile apparatus has a CCU for receiving image data, a decoder for decoding received data, an image memory for storing the decoded data, a CPU for controlling send/receive operation, and a printer for printing received data. High-speed data communication can be performed using a small-capacity memory and a digital transmission line and without data loss.

Growing community of inventors

Kawasaki, Japan

Yukihiko Ogata