Apparatus for detecting digital data
AssigneeSony Corporation
InventorsHajime Inoue, Takahito Seki, Keiji Kanota
Life of this patent
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Abstract
In an apparatus for detecting input digital data, for example, as derived by analog-to-digital conversion of a reproduced binary signal in analog form; a distributor circuit distributes the input digital data into at least two channels, a processing circuit in each channel processes the respective digital data in accordance with a predetermined formula, a decoder in each channel decodes an output of the respective processing circuit in accordance with the Viterbi algorithm, and the outputs of the decoders are composed or combined to provide therefrom a single sequence of digital data.
Claims24
An apparatus for detecting input digital data comprising:
- distributing means for distributing said input digital data into at least two channels;
- said distributing means being operative to distribute a first group of said input digital data including less than all of said input digital data into a first one of said channels, and to distribute a second group of said input digital data including less than all of said input digital data and including data outside said first group into a second one of said channels;
- processing means in each of said channels for processing said digital data in the respective channel in accordance with a predetermined formula;
- decoder means in each of said channels for decoding an output of said processing means in said respective channel in accordance with the Viterbi algorithm;
- and
- means for composing outputs of said decoder means in said channels to obtain digital data in one sequence.
An apparatus for detecting input digital data, comprising:
- means for deriving said input digital data from a binary signal of analog form reproduced from a magnetic tape by a magnetic head;
- distributing means for distributing odd numbered ones of said input digital data into a first channel and even numbered ones of said input digital data into a second channel;
- processing means in each of said channels for processing the digital data in the respective channel in accordance with a predetermined formula of (1+D) in which D is a delay operator, said predetermined formula being derived from a class IV partial response scheme;
- decoder means in each of said channels for decoding an output of said processing means in said respective channel in accordance with the Viterbi algorithm;
- and
- means for composing outputs of said decoder means in said channels to obtain digital data in one sequence.
An apparatus for detecting digital data from a binary signal recorded in analog form on a magnetic tape comprising:
- playback means including a magnetic head for reproducing said signal recorded on said magnetic tape;
- analog-to-digital converter means for converting an output of said playback means into digital data;
- distributing means for distributing said digital data from said converter means into at least two channels;
- said distributing means being operative to distribute a first group of said input digital data including less than all of said input digital data into a first one of said channels, and to distribute a second group of said input digital data including less than all of said input digital data and including data outside said first group into a second one of said channels;
- processing means in each of said channels for processing said digital data in the respective one of said channels in accordance with a class IV partial response scheme;
- decoder means in each of said channels for decoding an output of said processing means in the respective channel in accordance with the Viterbi algorithm;
- and
- means for composing the outputs of said decoder means in said channels to obtain digital data in one sequence.
An apparatus for detecting digital data from a binary signal recorded in analog form on a magnetic tape comprising:
- playback means including a magnetic head for reproducing said signal recorded on said magnetic tape;
- analog-to-digital converter means for converting an output of said playback means into digital data;
- distributing means for distributing odd numbered ones of said digital data from said converter means into one of said channels and even numbered ones of said digital data from said converter means into another of said channels;
- processing means in each of said channels for processing said digital data in a respective one of said channels in accordance with a class IV partial response scheme;
- decoder means in each of said channels for decoding an output of said processing means in the respective channel in accordance with the Viterbi algorithm;
- and
- means for composing the outputs of said decoder means in said channels to obtain digital data in one sequence.
A method for processing input digital data, comprising the steps of:
- distributing a first group of said input digital data including less than all of said input digital data into a first one of a plurality of channels;
- distributing a second group of said input digital data including less than all of said input digital data and including data outside said first group into a second one of said plurality of channels;
- processing said digital data in each channel in accordance with a predetermined formula to yield processed digital data;
- decoding the process digital data in each channel in accordance with the Viterbi algorithm;
- and
- combining the decoded digital data from each channel to obtain a single sequence of digital data.
Dependencies are inferred from the claim text.