Autosync circuit for error correcting block decoders

Details Autosync circuit for error correcting block decoders Autosync circuit for error correcting block decoders

1985-07-26

1987-07-14

Atkinson, Charles E.

Excavating

371 47, G06F 1110

Patent

active

046807659

ABSTRACT:
Error correcting decoders fall into two catagories, block decoders and convolutional decoders. In either case, the decoder must be synchronized with the received data. For block decoders, an external signal such as that produced by a Frame Synchronizer can be used for this purpose. For many applications, it is preferable to have the decoder acquire synchronization automatically without the need for an external device. This disclosure describes a circuit for automatically synchronizing a block decoder. When the usual or conventional methods are used, a special pattern called the Frame Sync Signal must be transmitted. In this new improved circuit, the synchronization information is contained in the error correcting code with no additional bits being required for synchronization and no reduction in error correcting capability. Because of the relative simplicity of the circuit, it may be incorporated within the decoder or optionally, it may be contained in a separate device. As the principles for operation are so vastly different than other synchronizers, the circuit when produced as a separate device could be correctly called a Decoder Synchronizer. The Autosync Circuit has applications for Error Correcting Decoders which use either short or long block codes.

REFERENCES:
patent: 3587043 (1971-06-01), Mengani
patent: 3820083 (1974-06-01), Way
patent: 3938086 (1976-02-01), Valbonesi
patent: 4412329 (1983-10-01), Yarborough, Jr.
patent: 4425645 (1984-01-01), Weaver et al.

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