Patents by Inventor Satoru Tazaki

Satoru Tazaki 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).

  • Circuit for controlling separation and high-cut operation of a stereo demodulator in an FM radio receiver
    Patent number: 4710958
    Abstract: A control circuit in an FM radio receiver includes a current mirror circuit which extracts a ripple component caused by a multipath disturbance and superposed on an S-meter output voltage from an intermediate frequency amplifier/detector of the FM radio receiver, and decreases the S-meter output voltage in response to the degree of the ripple component to use the decreased S-meter output voltage as a control voltage for control of separation and high-cut operations of a stereo demodulating stage of the FM radio receiver.
    Type: Grant
    Filed: May 7, 1986
    Date of Patent: December 1, 1987
    Assignee: Clarion Co., Ltd.
    Inventor: Satoru Tazaki
  • Control voltage generating circuit for activating a noise reduction circuit in an FM stereo receiver
    Patent number: 4694500
    Abstract: A high-cut and high-blend control voltage generating circuit for activating a noise reduction circuit of an FM stereo receiver is configured to be simply responsive to multipath noises and never to plug noises. A changing and discharging circuit in the control voltage circuit may have a relatively long charging time constant, and the voltage control circuit may be configured to be simply responsive to multipath noises above a predetermined level. Thus the circuit is much less liable to operate erroneously.
    Type: Grant
    Filed: February 28, 1986
    Date of Patent: September 15, 1987
    Assignee: Clarion Co., Ltd.
    Inventors: Satoru Tazaki, Yasuhiro Yoshioka, Kiyoshi Amazawa
  • AC-DC transformation circuit
    Patent number: 4685048
    Abstract: An AC-DC transformation circuit according to this invention facilitates operational stability by transforming an AC inputted voltage first into current and then transforming the current into a DC voltage.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: August 4, 1987
    Assignee: Clarion Co., Ltd.
    Inventor: Satoru Tazaki
  • Tuner control system
    Patent number: 4387469
    Abstract: An automatic tuner control system characterized in that the device comprises a detector for detecting a signal level in a radio receiver, a means for setting a reference signal level and a comparator means for doing comparison between the signal level and the reference signal level. Thus, the device is arranged to switch the received waves of the radio receiver in response to the result of the comparison in the comparator means and various conditions.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: June 7, 1983
    Assignee: Clarion Co., Ltd.
    Inventors: Takao Miyazaki, Satoru Tazaki