Abstract: When receiving the reproduced data from the optical disc and buffering same, the buffering from the correct position can be started on the basis of the synchronous signal and the address information included in the sub data which was received simultaneously. There is provided a method for controlling the buffering of the main data which is reproduced from the optical disc, in which the main data and the sub data are received with taking word clocks which are partitioning timings having plural bits of the main data as a unit as references, a synchronous signal which is in synchronization with the main data is generated, and the buffering of the main data is started on the basis of the synchronous signal.

Abstract: The writing in of the reproduced data from the optical disc 101 or the reproduced data from the external USB device 103 into the memory 106 is carried out in such a manner that the data storage formats on the memory 106 of the both writing in are the same storage formats with each other, and the writing in control into the memory 106 and reading out control from the memory 106 are carried out by the similar methods with each other. Thereby, in a data reproduction method having a function of reproducing data which is recorded in the optical disc 101 and a function of reproducing data from an external USB device, a reproduction device which provides no complicated control method as well as gives no large load to the system and is of a high efficiency can be provided.

Abstract: When receiving the reproduced data from the optical disc and buffering same, the buffering from the correct position can be started on the basis of the synchronous signal and the address information included in the sub data which was received simultaneously. There is provided a method for controlling the buffering of the main data which is reproduced from the optical disc, in which the main data and the sub data are received with taking word clocks which are partitioning timings having plural bits of the main data as a unit as references, a synchronous signal which is in synchronization with the main data is generated, and the buffering of the main data is started on the basis of the synchronous signal.

Abstract: The read out data is written in into the buffer 10 and when it is judged as it is not a desired user block by the user block judging means 7, the address pointer is controlled to keep the original position in the buffer 10 by the address pointer generating means 8, thereby enabling to over-write the user data from the beginning of the written in link section data to abolish the link section data. Thereby, when the data which are written in by a hack light system is read out, unnecessary data at the link section would not be stored in the buffer 10, there is required no buffer space for storing the data at the link section, and it is not required to store the data that has discontinuity due to the data lacking in the buffer 10, and thus it is possible to provide such a signal processing circuit that can reduce burden to the system control means 11 and can shorten the access time to the data.