Viterbi - a decoding method and circuit therefor

摘要

The invention importantly the ability of the Viterbi decoding method and relates to the circuit, without increasing the circuit scale decoding processing system for demodulating the reproduction signal of the magnetic recording and reproducing apparatus.; The present invention by the first and second comparators to the equalizer for waveform equalization that the input playback signal, +1 and -1 respectively at the threshold to form a choewooho decoding the PR4 values ​​can state 2 as the Viterbi method, constant amplitude to obtain binary encoded data and the second tooth expensive data of the width direction of the weak direction, Moreover, by dividing each predetermined time switching, and group these data. And the like grouped data Viterbi decoding after performing a treatment group of the last decoded ingestion is Viterbi decoded by the method and then release the grouped after mating of the first decoded data of the group of said performed, A / D converter or microprocessor and without using a shift register as an essential component a simple Viterbi decoding circuit is configured.