Media storage device with embedded data filter for dynamically processing data during read and write operations

(57) The filter which processes the data stream which is written in medium memory storage or is read from medium memory storage based on a general-purpose clock is built into the medium memory storage concerning summary book invention. Further, even if medium memory storage is written in medium memory storage, it can also process the data stream which is not even if read from medium memory storage. Preferably, the filter built into medium memory storage receives the command programmed from the external instrument, and uses it as the eye ソクロノス data pipe which processes a data stream in real time synchronizing with a general-purpose clock based on this programmed command. In addition, you may form the fixed firmware for performing predetermined processing to an eye ソクロノス data pipe. Medium memory storage is preferably connected to an IEEE1394*1995 serial-bus network. In writing processing, medium memory storage receives a data stream, and after these data streams are changed into a different format by the incorporated filter, they are stored in the medium in medium memory storage. In read-out processing, medium memory storage transmits a data stream. After changing into the format which changes a data stream with incorporated filters at this time, the changed data stream is transmitted to an IEEE1394*1995 serial-bus network. Also in which processing, in order to synchronize a data stream, a general-purpose clock is used. The medium memory storage can also process the data stream sent and received between two apparatus of the others on an IEEE1394*1995 serial-bus network using the incorporated filter.