Data receiver for receiving code signals having a variable data rate

A data receiver for receiving code data having a variable data rate and encoded with any one of a plurality of data rates and then repeated in accordance with the respective data rates to be provided with a same data rate thereby, and for restoring, frame by frame, the code data received to data having original data rates, said data receiver comprising:

• data rate detecting means for sequentially receiving one frame of the code data having the same data rate at a time, and detecting the data rate of the one frame of the code data assigned before repetition of the code data;
• data rate restoring means for restoring, based on the data rate detected by said data rate detecting means, the one frame of the code data to the data having the original data rate;
• and
• data reproducing means for reproducing an original signal out of the code data restored by said data rate restoring means;
• said data rate detecting means comprising:
• calculating means for calculating autocorrelation functions of the one frame of the code data to thereby determine how many times the code data have been repeated;
• and
• deciding means for determining the data rate of the one frame of the code data assigned before the repetition on the basis of a characteristic of the data rate in the autocorrelation functions;
• said data rate restoring means and said data reproducing means each performing respective processing on the basis of the data rate determined by said deciding means.