Abstract: In a facsimile apparatus, an image to be transmitted is stored in a first memory and the stored image is transferred to and stored in a second memory, which is capable of being loaded to and unloaded from the facsimile apparatus. This processing is executed if certain conditions such as time are satisfied, and if the second memory has been loaded. After the transfer of the image data, the status of storage in each of the first and second memories is managed. In a case where the transmitted image that has been stored in the second memory is to be transferred to the first memory, a necessary condition is that the image stored in the loaded second memory coincide with the contents of the managed status of storage.

Abstract: A facsimile apparatus is disclosed in which a transmitting/receiving operation, as well as a copying operation, is performed by an operator in exactly the same manner regardless of whether an encrypting device is connected to the facsimile apparatus, and regardless of whether the encrypting device includes an NCU. When the operator picks up a handset, HOOK 16 and HOOK-A 25 both rise from logical "0" to logical "1". The operator confirms an outgoing call or a signal from another party's facsimile apparatus and presses a start button. Since HOOK-A 25 is at logical "1", the flow controller 11 causes CML 23 to rise from logical "0" to logical "1", thereby starting the transmitting/receiving operation. When the operator hangs up the handset, HOOK 16 and HOOK-A 25 revert to logical "0". When the transmitting/receiving operation subsequently ends, CML 23 reverts from logical "1" to logical "0".

Abstract: A data communication apparatus includes a data communication section for preforming data communication according to full duplex communication, a testing section for performing a communication test prior to the data communication, and a transmission controller for determining whether full duplex communication can be performed during a period of the communication test performed by the testing section. The testing section includes a backward signal generator, a backward signal detector, and a control signal analyzer. The backward signal generator and the backward signal detector may be replaced with an echo canceller.

Abstract: An image transmission apparatus including a storage unit for storing an image signal; a conversion unit for converting the number of dots of one line image signal in the storage unit; and a transmission unit for selectively transmitting the output of the conversion unit or an image signal in the storage unit.

Abstract: A data transmission apparatus includes; comprising: a transmission data generating unit, a storage unit for storing the transmission data; and a unit for transmitting the transmission data in the storage unit; wherein the storage unit stores, together with the transmission data, time and date when the transmission data was stored.

Abstract: An image transmission method includes the steps of: obtaining an image signal by reading an original image; compression-encoding the obtained image signal; temporarily storing the encoded image data into a temporary storage memory; presuming the empty capacity of a buffer memory for temporarily storing the received image data at a receiving side; and transmitting the encoded image data in accordance with the presumed empty capacity.

Abstract: A test signal is received for testing the transmission rate, the number of errors in the test signal in a predetermined time period is detected, and the number of errors is compared with a predetermined number to determine the proper transmission rate for data communication.