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Apparatus for magnetic recording and reproducing digital audio data allocates upper bits and lower bits on an alternating basis among pair of tracks

  • US 5,424,879 A
  • Filed: 10/22/1993
  • Issued: 06/13/1995
  • Est. Priority Date: 10/30/1992
  • Status: Expired due to Term
First Claim
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1. A recording and reproducing apparatus for recording and/or reproducing left channel and right channel audio data with a high it rate, wherein a running speed of a magnetic tape and a number of revolutions of a rotary head round which said magnetic tape is wrapped are controlled to "N" times in case of normal mode (N≧

  • 2;

    "N" is a positive integer), and processing speeds of a reproducing signal processing unit, a modulating circuit, a demodulating circuit, and a recording signal processing unit are "N" times in case of the normal mode, said recording and reproducing apparatus comprising;

    dividing means for dividing quantized data a number of bits of which is "m" into upper-bit data a number of bits of which is "m1 " and lower-bit data a number of bits of which is "m2 " for each left and right channel;

    discriminating data generating means for generating discriminating data for discriminating between said upper "m1 " bits data and lower "m2 " bits data;

    data converting means for converting each of said upper "m1 " bits data and lower "m2 " bits data into "n" bits data (n≧

    m1, n>

    m2), and sequentially outputting them at said N times processing period;

    recording signal generating means for interleaving an output from said data converting means at said N times interleaving period, and then converting them into recording data with error correcting codes; and

    recording data recording means for forming N pairs of recording tracks having a positive or a negative azimuth angle at said N times interleaving period, and sequentially recording said recording data and discriminating data in a predetermined area onto said N pairs of recording tracks (N, m, m1, m2, and n are positive integers);

    whereinsaid data converting means further operates for setting said processing period to twice said interleaving period, and dividing each of recording tracks into a scan start side recording area and a succeeding scan end side recording area, with respect to two pairs of said recording tracks formed by said processing period;

    in said two pairs of recording tracks consisting of first, second, third, and fourth recording tracks;

    one of said left channel or said right channel upper-bit data of the first half of said processing period is allocated to said scan start side recording area of the first recording track, and the other of said left channel or said right channel lower-bit data of the first half of said processing period is allocated to said succeeding scan end side recording area;

    said other of said left channel or said right channel upper-bit data of the first half of said processing period is allocated to said scan start side recording area of the second recording track, and said one of said left channel or said right channel lower-bit data of the first half of said processing period is allocated to the succeeding scan end side recording area;

    one of said left channel or said right channel lower-bit data of the second half of said processing period is allocated the said scan start side recording area of the third recording track, and the other of said left channel or right channel upper-bit data of the second half of said processing period is allocated to the succeeding scan end side recording area; and

    said other of said left channel or said right channel lower-bit data of the second half of said processing period is allocated to said scan start side recording area of the fourth recording track, and said other of said left channel or right channel upper-bit data of the second half of said processing period is allocated to the succeeding scan end side recording area.

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