Patents by Inventor Tokuichi Minakawa

Tokuichi Minakawa 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: 5636076
    Abstract: After an audio signal at a given level is recorded, the recording level is changed and a video signal is recorded. The audio and video signals are reproduced. A first recording level at which the reproduced video signal becomes the maximum level, a second recording level which is smaller than the first recording level and at which the reproduced video signal level becomes the maximum value.times.0.9, a third recording level at which the reproduced audio signal level is equal to or greater than a reference value, and a fourth recording level at which the reproduced audio signal level becomes equal to or greater than the minimum value are stored in storages, respectively. The video head recording current value is controlled according to the optimum recording level found by an arithmetic section based on the stored recording levels.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: June 3, 1997
    Assignee: Akai Electric Co., Ltd.
    Inventors: Tokuichi Minakawa, Shinji Tanimoto
  • Patent number: 5446539
    Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: August 29, 1995
    Assignee: Akai Electric Co., Ltd.
    Inventor: Tokuichi Minakawa
  • Patent number: 5416641
    Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: May 16, 1995
    Assignee: Akai Electric Co., Ltd.
    Inventor: Tokuichi Minakawa
  • Patent number: 5400149
    Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: March 21, 1995
    Assignee: Akai Electric Co., Ltd.
    Inventor: Tokuichi Minakawa
  • Patent number: 5257109
    Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: October 26, 1993
    Assignee: Akai Electric Co., Ltd.
    Inventor: Tokuichi Minakawa
  • Patent number: 5249064
    Abstract: A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in a
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: September 28, 1993
    Assignee: Akai Electric Co., Ltd.
    Inventor: Tokuichi Minakawa