Abstract: An interface device is connected to an OA (office automation) apparatus, such as a printer, a copier, a facsimile apparatus, a scanner or the like, and provides the OA apparatus with a new interface by being supplied with electric power from the OA apparatus. The interface device includes an extended-interface control unit for controlling an interface which is supplied with electric power from the OA apparatus and performs transmission/reception of data to/from the OA apparatus, a clock-frequency control unit for variably controlling an operational clock frequency for the interface device, and a unit for asking the OA apparatus about a current capacity suppliable from the OA apparatus. The clock-frequency control unit controls the clock frequency in order to suppress current consumption of the interface device within the current capacity.

Abstract: A facsimile apparatus comprises an input unit for inputting an image signal and a substitution unit for substituting an image area having consecutive main scan lines each containing no larger than a predetermined amount of significant information of the input image which is longer than a first predetermined length by a predetermined image of a second predetermined length in a direction of sub-scan.

Abstract: A facsimile system includes a memory for storing a plurality of full dialing numbers at predetermined addresses of a plurality of abbreviated dialing numbers, a delivery unit for delivering to a telephone circuit one of the full dialing numbers which is read out of the memory in response to the designation of an address corresponding to one of the abbreviated dialing numbers, an input unit for issuing transmission command information and address information for the abbreviated dialing number, a first control unit for controlling the facsimile communication operation so as to detect the end of a facsimile reception, and a second control unit for controlling the readout, from the memory, of the full dialing number specified by the address information of the abbreviated dialing number from the input unit and for also controlling the delivery of the full dialing number from the delivery unit.