| 摘要 |
PURPOSE:To correctly decode a member code by providing a correction circuit for inverting or replacing demodulated data if a consecutive error takes place in a received code. CONSTITUTION:If a sequential decoder 5 receives replaced or inverted data, since a received code stored in a buffer causes a consecutive erroneous code, a consecutive error detection circuit 6 measures the duration time of a skip signal generated to avoid consecutively erroneous code strings. If the duration time exceeds a predetermined time, a correction pattern in a correction circuit 4 provided to the input side of the sequential decoder 5 is switched by using an error signal sent from the consecutive error detection circuit 6 to replace or invert the demodulated data. Since the correction of the replacement or inversion of data is applied before the data is inputted to the sequential decoder 5 in this way, the member code is decoded correctly. |
