Information transmission method and encoding/decoding apparatus and encoding-multiplexing/decoding-demultiplexing apparatus in information transmission system to which information transmission method is applied
In an information transmission method, error robustness is provided for the bit stream itself so that decoding processing can be properly performed even in the event of an error in important information such as header information. A bit stream reconstruction circuit (107) in an encoding apparatus adds sync signals to the heads of encoded data streams, which are encoded by an encoder (103), in certain bit stream units, and then inserts designation information in each bit stream by using a designation information insertion circuit (106). Each designation information indicates the addition of information for reconstructing important header information. By inserting the designation information in the bit stream obtained, reconstruction information can be added to the bit stream. Even if, therefore, an error is introduced into the header information, and the information cannot be used for decoding processing, the decoding processing can be properly continued by using the new reconstruction information designated by the designation information as a substitute.
CROSS REFERENCE TO RELATED APPLICATIONS
This Application is a divisional of and claims the benefit of the earlier filing date of co-pending U.S. patent application Ser. No. 09/920,936, filed Aug. 3, 2001, which is a divisional of U.S. patent application Ser. No. 09/068,017, filed May 1, 1998 (now U.S. Pat. No. 6,310,897), which is the National Stage of International Application No. PCT/JP97/03054, filed Sep. 2, 1997. The entire disclosure of the prior application is considered as part of the disclosure of the accompanying application and is hereby incorporated by reference herein.
Priority Data
Sep 02, 1996 [JP] 8-232081 Mar 14, 1997 [JP] 8-061306 Jun 25, 1997 [JP] 9-168929 Jul 14, 1997 [JP] 9-188750
A multiplexed audio data decoder apparatus is provided in which integration of an audio decoder is easy, and has a high flexibility when the number of the formats to be processed is increased or when the specification is changed. In an external ROM 60 there are accumulated a plurality of decoding program codes corresponding to respective plural methods for compressing and encoding. A controller means 50 transfers the decoding program code corresponding to the method for compressing and encoding after changing thereof, from the external ROM 60 to an internal RAM 25. A DSP 22 starts decoding processing by using the decoding program code which is transmitted into the internal RAM 25.
