Patent ID: 7305338

Claim:
Compensating circuitry for substituting for erased periodic signal data periodic signal data input before the erased periodic signal data, comprising: a past data saving circuit configured to save a predetermined number of latest periodic signal data input; a decision circuit configured to determine whether or not an erasure occurs with every periodic signal data sequence, which is a unit of processing; a substituting circuit configured to use, when an erasure occurs, a periodic signal data sequence lying in a predetermined segment to be used among periodic signal data sequences saved in said past data saving circuit, to generate synthetic data for substitution; and a position controller configured to determine, when the erasure has occurred over a plurality of units of processing, a position of the segment to be used such that the position varies for each of the units of processing, said position controller calculating periods of the periodic signal data sequences saved in said past data saving circuit and selecting, among the periods calculated, a period shorter than a width of the segment to be used as an index for varying the segment for every processing frame.