| 摘要 |
Data communications terminals efficiently transfer image and audio data across a data circuit without being affected by the degree of congestion of the data circuit by altering, in accordance with the degree of congestion, the image and sound qualities and/or the transfer rate of each frame while maintaining minimum preferred qualities of the image and audio data. To do this, a transmitting terminal ( 2 ) and a receiving terminal ( 4 ) have the same data transfer capabilities. The data transfer capability include a transmission capability that enables regulation of the image and sound qualities and/or frame rate of each data frame to be transmitted from the transmitting terminal ( 2 ) to the receiving terminal ( 4 ) based on whether the measured data transmission time required to transmit a respective data frame has increased or not. The data transfer capability also includes a reception capability that enables measurement of data reception time required for the receiving terminal ( 4 ) to receive a respective data frame transmitted from the transmitting terminal ( 2 ) and returns the measured data reception times to the transmitting terminal ( 2 ). The transmitting terminal ( 2 ) regulates the image and sound qualities and/or frame rate of a subsequent data frame to be sent based on the data transmission time and/or the data reception time.
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