Apparatus and method for generating a digital tracking signal with a frequency spectrum corresponding to one or more n-bit words
AssigneeLG Electronics Inc.
InventorHyun Chul Shin
Life of this patent
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Abstract
A signal recording apparatus for a video instrument using a magnetic recording medium which is capable of more accurately computing the signal to be recorded on the tape by correcting the output signal when affixing "1" or "0" after computing the output signal to which the pilot tone is affixed. In addition, one line block is used on the assumption that "1" or "0" is always affixed to the code word.
Claims20
A device for generating a digital tracking signal having a frequency spectrum corresponding to one or more n-bit information words, comprising:
- means for affixing a fixed 1-bit value to each of said n-bit information words to generate (n+1)-bit channel words;
- an aT precoder, "a" being an integer value greater than or equal to two and "T" being the bit period associated with said (n+1)-bit channel word, for encoding a respective one of said (n+1)-bit channel words to generate an (n+1)-bit code word, whereby even and odd bits of code words affixing "0" are inverted to even and odd bits of the code words affixing "1" in the synchronous words, odd bits of code words affixing "0" are identical with the odd bits of the code words affixing "1" in the non-synchronous words;
- a control signal generator, coupled to said aT precoder, for determining whether the frequency spectrum associated with said (n+1)-bit code word has a desired pattern to generate a control signal, and for outputting a control signal which modifies an affixing value if the frequency spectrum is not the desired pattern based on the result of the determination;
- and
- a correction device, coupled to said to aT precoder, for modifying said (n+1)-bit code word to generate a tracking signal having a desired frequency spectrum in response to said Control Signal.
A method for generating a digital tracking signal having a frequency spectrum corresponding to one or more n-bit information words, comprising:
- affixing a fixed 1-bit value to each of said n-bit information words to generate (n+1)-bit channel words;
- encoding a respective one of said (n+1)-bit channel words to generate an (n+1)-bit code word;
- determining whether the frequency spectrum associated with said (n+1)-bit code word has a desired pattern to generate a control signal base on the result of determination, whereby even and odd bits of code words affixing "0" are inverted to even and odd bits of the code words affixing "1" in the synchronous words, even bits of code words affixing "0" are inverted to even bits of the code words affixing "1" and odd bits of code words affixing "0" are identical with the odd bits of the code words affixing "1" in the non synchronous words;
- and
- modifying said (n+1)-bit code word to generate a tracking signal having a desired frequency spectrum pattern in response to said control signal.
Dependencies are inferred from the claim text.