US 5,179,560 AGranted

Apparatus for decoding BCH code for correcting complex error

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsAtsuhiro Yamagishi, Touru Inoue, Tokumichi Murakami, Kohtaro Asai

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Abstract

An apparatus for decoding a received BCH code signal for correcting a combined complex error is disclosed which includes a syndrome generating circuit for generating two n-bit syndromes corresponding to the received signal, a syndrome converting circuit for converting the two n-bit syndromes to a 2n-bit syndrome, a random error correcting circuit, a burst error correcting circuit, two combining circuits and output selecting circuit. The random error correcting circuit receives input as the two n-bit syndromes and outputs a random error correction signal to one of the combining circuits and the burst error correcting circuit receives as input the 2n-bit syndrome and outputs a burst error correction signal to the other of the combining circuits. The combining circuits combine the correction signals with the received BCH code signal. The output selecting circuit selectively outputs one of the combined signals from the combining circuits in accordance with the decoding conditions of the error correcting circuits and the result of a comparison between the decoded and error-corrected signals from the combining circuits.

Claims8

Dependent claims

An apparatus for decoding a received BCH code signal on a communication path for correcting complex error comprising;

a syndrome generating circuit for generating two syndromes for correcting a random error of said BCH code signal;
a first unit for correcting a random error of said BCH code signal by using decoding means, said first unit being connected to said syndrome generating circuit to receive and use the two syndromes in correcting the random error;
a syndrome converting circuit, connected to said syndrome generating circuit, for converting said two syndromes into a single converted syndrome;
a second unit for correcting a burst error of said BCH code signal by using decoding means, said second unit being connected to said syndrome generating circuit to receive and use the converted syndrome in correcting the burst error;
and
a third unit connected to said first and second units for deciding which output signal of said first or second unit is to be selectively output in response to the condition of the communication path, said third unit including;
means for grasping the condition of the communication path, said means connected to the first and second units to received decoded output signals from said first and second units wherein the output signals are used to grasp the condition of the communication path;
and
means for judging the condition of the communication path as obtained by the means for grasping to determine which output signal of said first and second units is to be selectively output.

6 more elements

Dependencies are inferred from the claim text.