Claims
- 1. A recording apparatus comprising: a bit extracting means for extracting inverted m+1 bits of a first series of bits obtained by an interleaved NRZI modulation of an input data series added to one "0" bit per every m bits (m is an even number which is equal to or greater than 2) and a second series of bits obtained by an interleaved NRZI modulation of the input data series added to one "1" bit per every m bits; a frequency component extracting means for extracting at least two specific frequency components from outputs of the bit extracting means; an output selection means for producing an output bit series depending on a value of the frequency component; and a recording means for recording the output bit series on a recording medium, wherein the frequency component extracting means comprises: a digital filter for extracting at least two specific frequency components from the first series of bits and the second series of bits.
- 2. A recording apparatus of claim 1, wherein the digital filter is a digital filter for extracting the frequency components at the frequency of a common measure of extracting frequency.
- 3. A recording apparatus comprising: a bit extracting means for extracting inverted m+1 bits of a first series of bits obtained by an interleaved NRZI modulation of an input data series added to one "0" bit per every m bits (m is an even number which is equal to or greater than 2) and a second series of bits obtained by an interleaved NRZI modulation of the input data series added to one "1" bit per every m bits; a frequency component extracting means for extracting at least two specific frequency components from outputs of the bit extracting means; an output selection means for producing an output bit series depending on a value of the frequency component; and a recording means for recording the output bit series on a recording medium, wherein the frequency component extracting means comprises:
- a representative value generating means for generating a representative value of every K bits of series from the first and second series of bits; and
- a digital filter for extracting at least two specific frequency components in the series of the representative values.
- 4. A recording apparatus of claim 3, wherein the digital filter is a digital filter for extracting the frequency components at the frequency of a common measure of extracting frequency.
Priority Claims (4)
Number |
Date |
Country |
Kind |
4-278954 |
Oct 1992 |
JPX |
|
4-321608 |
Dec 1992 |
JPX |
|
4-321610 |
Dec 1992 |
JPX |
|
4-321611 |
Dec 1992 |
JPX |
|
Parent Case Info
This is a Divisional application of now pending application Ser. No. 08/453,777, filed May 30, 1995 now U.S. Pat. No. 5,579,182, which in turn is a Continuation of now abandoned application Ser. No. 08/124,637, filed Sep. 22, 1993, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (5)
Number |
Date |
Country |
EP0250049 |
Dec 1987 |
EPX |
EP0339724 |
Nov 1989 |
EPX |
EP0476767 |
Mar 1992 |
EPX |
EP0476766 |
Mar 1992 |
EPX |
4255969 |
Sep 1992 |
JPX |
Non-Patent Literature Citations (4)
Entry |
Patent Abstracts of Japan, vol. 17, No. 058 (P-1481), 4 Feb. 1993. |
Patent Abstracts of Japan, vol. 15, No. 308 (E-1097), 7 Aug. 1991. |
Patent Abstracts of Japan, vol. 16, No. 404 (P-1410), 26 Aug. 1991. |
Patent Abstracts of Japan, vol. 10, No. 259 (E-434), 4 Sep. 1986. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
453777 |
May 1995 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
124637 |
Sep 1993 |
|