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Viterbi decoding method and circuit therefor

A Viterbi decoding and decoding technology, applied in the field of simple hardware circuits, can solve the problems of increased manufacturing cost, increased chip size, increased chip area, etc.

Inactive Publication Date: 2003-06-25
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0042] If the Viterbi decoding circuit is built into an integrated circuit (IC), due to the addition of an A / D converter and a digital signal processor, the chip size increases and the manufacturing cost also increases.
In particular, 64 comparators should be incorporated into the 6-bit embedded A / D converter used in the conventional Viterbi decoding circuit, thereby increasing the chip area

Method used

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  • Viterbi decoding method and circuit therefor
  • Viterbi decoding method and circuit therefor
  • Viterbi decoding method and circuit therefor

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Embodiment Construction

[0060] First, according to the Viterbi decoding method of the present invention, Viterbi decoding is performed along the reverse direction of the state transition diagram so that the paths are connected at each branch point. As a result, there is no reason to store the results of measurement operations in memory on a per-state basis. That is, no operations performed by the microprocessor are required, and no memory for storing the results is required. Furthermore, paths on the state transition diagram can be determined from instantaneous values ​​derived from positive or negative peak detection.

[0061] The input signal is divided and grouped by a predetermined time. To decode in the reverse direction, the positive and negative peaks of the input signal within a group are detected instead of calculating the measure, and then processed in the reverse direction. Considering that the state of the next set of initial decoded data is related to the current set of final decoded d...

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Abstract

A Viterbi decoding method and a circuit therefor are provided, for demodulating a reproduced signal from a magnetic recording / reproducing apparatus. According to the Viterbi decoding method, a reproduced signal whose waveform is equalized by an equalizer is input and positive and negative peak data are obtained by two comparators whose thresholds are interlocked. Then, the data is divided by a predetermined time to be grouped. After Viterbi-decoding the grouped data in the reverse direction, final decoded data of the present group and initial decoded data of the next group are concatenated. The Viterbi decoding circuit has simple structure in which a shift register is adopted as a major constituent, without an analog-to-digital converter and microprocessor.

Description

technical field [0001] The present invention relates to a kind of Viterbi (Viterbi) decoding method and the circuit that is applicable to this method, and the present invention particularly relates to a kind of Viterbi decoding method that is applied to digital information high-speed and high-density recording / playback and is applicable to this The simple hardware circuit of the method. Background technique [0002] Recording / reproducing apparatus adopting a digital method have been widely used recently. In this device, analog video and audio signals are converted into digital signals, and then recorded on a magnetic recording medium through source encoding processing and channel encoding processing. A digital signal recorded on a magnetic recording medium is reproduced through channel decoding processing and source decoding processing. [0003] figure 1 is a block diagram of the digital processing system in a digital video cassette recorder. [0004] exist figure 1 , a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/14G11B20/10G11B20/18H03M13/23H03M13/41
CPCH03M13/6331H03M13/6502H03M13/41G11B20/10009G11B20/10
Inventor 岩村总一全镇圭
Owner SAMSUNG ELECTRONICS CO LTD