Abstract: When the data supply rate from the data storing unit 11 drops and the amount of data remaining in the buffer memory 21 decreases, the calculation circuit 25 determines a data reproduction speed at which reproduction should be performed, dependently on the amount of data in the buffer memory 21. Accordingly, the video reading circuit 23 is controlled to retrieve video data from the buffer memory 21 at a reduced reproduction speed. The monitor 13 reproduces a slow motion pictures, which leads to an enhancement of the buffer memory.

Abstract: A microcomputer selects one of a plurality of drive units, and controls the selected drive unit to reproduce image data from a video disk located thereon. When a reproduction error occurs in the thus reproducing drive unit, the microcomputer selects another drive unit, and controls the drive unit to reproduce images. Accordingly, it is possible to always provide accurate images.

Abstract: A data communicating device is provided having an actuating means that is driven when data is to be transmitted/received. Prior to transmitting/receiving data, the actuating means is driven and a transmission condition is set in accordance with a determined noise level of the actuating means. The data is then transmitted/received in accordance with the thus set transmission condition.

Abstract: A facsimile device transmits image data from a calling station to a facsimile device at a called station over a transmission line. The facsimile device has an image reader for reading image data to be transmitted, and a driver including a motor for actuating the image reader to read the image data. When a TCF signal is transmitted from the calling station to the called station to check the condition of the transmission line, a controller energizes the motor, which results in electrical noise being generated, corrupting the TCF signal. The controller then controls a transmission rate at which the image data is to be transmitted depending on the level of electrical noise in the TCF signal, that is detected at the called station. Since the transmission rate is established depending on the level of electrical noise, communication or decoding errors are reduced during the transmission of the image data.