Patents by Inventor Yoichi Zenno

Yoichi Zenno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6504991
    Abstract: First and second magnetic heads provided on a rotary drum alternately scan a magnetic tape. The first and second magnetic heads are different from each other in azimuth angle. A digital information signal is fed to the first magnetic head and is recorded on the magnetic tape via the first magnetic head while the first magnetic head is scanning the magnetic tape in a long time recording mode of operation where the magnetic tape is driven at a speed equal to a predetermined standard speed multiplied by 1/N. Here, N denotes a predetermined integer equal to or greater than 2. The digital information signal is fed to the second magnetic head and is recorded on the magnetic tape via the second magnetic head while the second magnetic head is scanning the magnetic tape in the long time recording mode of operation.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: January 7, 2003
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno
  • Patent number: 6288857
    Abstract: A digital signal recording apparatus includes an amble generator for generating an amble signal representing a bit-sequence amble pattern. The bit-sequence amble patter can be detected and reproduced by a partial-response detection system “PR(1, 0, −1)” as a detected amble pattern having a period of state inversions which is shorter than a period of state inversions in a detected amble pattern corresponding to a recorded amble pattern of alternation of “1” and “0”. The amble signal generated by the amble generator and a first digital information signal are combined into a second digital information signal on a time sharing basis. The second digital information signal is recorded on a magnetic recording medium. For example, the bit-sequence amble pattern represented by the amble signal has repetition of six bits of “111000”.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: September 11, 2001
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno, Takeo Ohishi
  • Publication number: 20010002867
    Abstract: A digital signal recording apparatus includes an amble generator for generating an amble signal representing a bit-sequence amble pattern. The bit-sequence amble patter can be detected and reproduced by a partial-response detection system “PR(1, 0, −1)” as a detected amble pattern having a period of state inversions which is shorter than a period of state inversions in a detected amble pattern corresponding to a recorded amble pattern of alternation of “1” and “0”. The amble signal generated by the amble generator and a first digital information signal are combined into a second digital information signal on a time sharing basis. The second digital information signal is recorded on a magnetic recording medium. For example, the bit-sequence amble pattern represented by the amble signal has repetition of six bits of “11000”.
    Type: Application
    Filed: January 18, 2001
    Publication date: June 7, 2001
    Applicant: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno, Takeo Ohishi
  • Patent number: 6198585
    Abstract: A digital signal recording apparatus includes an amble generator for generating an amble signal representing a bit-sequence amble pattern. The bit-sequence amble patter can be detected and reproduced by a partial-response detection system “PR(1, 0, −1)” as a detected amble pattern having a period of state inversions which is shorter than a period of state inversions in a detected amble pattern corresponding to a recorded amble pattern of alternation of “1” and “0”. The amble signal generated by the amble generator and a first digital information signal are combined into a second digital information signal on a time sharing basis. The second digital information signal is recorded on a magnetic recording medium. For example, the bit-sequence amble pattern represented by the amble signal has repetition of six bits of “111000”.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: March 6, 2001
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno, Takeo Ohishi
  • Patent number: 6191900
    Abstract: A digital signal recording and reproducing apparatus includes a plurality of heads. A digital signal containing an information signal is recorded on a recording medium via heads among the heads while tracks are sequentially formed on the recording medium. The digital signal is reproduced from the recording medium via heads among the heads. A reproduced signal processing circuit operates for processing the reproduced digital signal at a changeable data processing rate to recover the information signal from the reproduced digital signal. During the recording, a speed of the heads, a speed of the recording medium, a data rate of the recording, and a number of used heads are set to changeable values respectively. The digital signal and a mode signal representative of the set values are recorded on the tracks at approximately a predetermined constant recording wavelength.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: February 20, 2001
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno
  • Patent number: 6122432
    Abstract: The present invention provides an information recording apparatus having a rotary drum, plural rotary heads provided on the rotary drum. Each of the plural rotary heads has a rotary transformer to record a recording signal which is obtained by processing a digital information signal to be recorded with a predetermined treatment, on a magnetic tape to form a predetermined track pattern by supplying the recording signal to the plural rotary heads through the rotary transformers. The apparatus further has a signal generating device for generating a signal having an intermediate voltage of an amplitude of the recording signal to be supplied to the rotary heads.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: September 19, 2000
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno
  • Patent number: 6084737
    Abstract: A magnetic playback system wherein, during high-speed playback, the speed of rotation of a drum motor is controlled so that the data rate of the playback signal from that one of two rotary heads for which the scanned area on the magnetic tape from which a playback signal can be obtained is larger, will be equal to the data rate of the recorded digital data signal. This drum motor speed control is effected by a speed control servo loop that includes a frequency detector which controls the speed control servo loop based on a speed detection signal and a speed information voltage generated by a speed information voltage generator. The speed information voltage generator generates this speed information voltage based on a control signal played back from the tape by a control head and a tape direction signal.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: July 4, 2000
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno
  • Patent number: 6052246
    Abstract: Additional information of multi-programs can be recorded using a source pack which indicates channel numbers and the like in multi-channel or single-channel recording. An additional flag AF in this pack indicates whether the pack is auxiliary information which is constructed with a plurality of pack groups or auxiliary information which is constructed with a single pack. If AF is 0 and the total pack number (T.P. No.) is 0, the pack is a source pack of a single channel. If AF is 0 and T.P. No. is n (.noteq.0), the T.P. No. is defined to indicate the source pack number. Also, if AF is 1 and T.P. No. is 0, the pack is the last pack; if AF is 1 and T.P. No. is n (.noteq.0), the T.P. No. indicates the total number of packs appended to the pack.
    Type: Grant
    Filed: June 25, 1997
    Date of Patent: April 18, 2000
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Seiji Higurashi, Yoichi Zenno