Particularly, the second data transmission rate is less than the first data transmission rate.

The data stream has a first data transmission rate.

In a particular embodiment, the first data transmission rate is different from the second data transmission rate.

The present invention improves the data transmission rate.

Further, the rate of transmission of the data stream is modified within the infrared adapter (106) to produce an output data stream having a second data transmission rate.

Accordingly, since only pure data are transmitted during data transmission, the data transmission speed becomes faster.

The mobile station raises, in predetermined steps, its transmission rate of upstream user data up to the maximum allowable transmission rate.

Also, the various transmission parameters may each be associated with a data transmission rate.

The present invention provides systems and methods for adaptive digital data transmission rate control.

A server device (100) transmits media data of a media rate calculated by a rate outputting means (102) to a client device (200) at a transmission rate calculated by the rate outputting means (102).

The present invention performs appropriate data transmission speed control.

As a result, the present invention has an effect of enhanced data transmission rate.

Therefore, it is possible to largely increase a data transmission speed of the USB system.

Therefore, a data transmission rate adopted to the communication environment can be obtained.

The system changes from one data transmission rate to another depending upon the quality of the communication channel.