Patents by Inventor Tadayoshi Tohoku

Tadayoshi Tohoku 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).

  • Gain control circuit, FM receiver and computer program product
    Patent number: 8644780
    Abstract: The present invention provides a gain control circuit for an FM receiver that can reduce a reproduced audio output according to the magnitude of the noise component of an intended signal included in a received signal. The gain control circuit of the present invention is constituted by a noise level measurement circuit 26 and a preamplifier 25. The noise level measurement circuit 26 measures a noise level in an audio signal Sa1 output from an FM detector 4 and outputs a control signal Sc corresponding to the noise level. The preamplifier 25 reduces an output according a value of the control signal Sc. With the gain control circuit of the present invention, the volume of the speaker is reduced as the noise component in the audio signal Sa1 increases due to a decrease in received electric field strength, and therefore discomfort caused by unpleasant noise can be reduced.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: February 4, 2014
    Assignee: Icom Incorporated
    Inventor: Tadayoshi Tohoku
  • GAIN CONTROL CIRCUIT, FM RECEIVER AND COMPUTER PROGRAM PRODUCT
    Publication number: 20130084819
    Abstract: The present invention provides a gain control circuit for an FM receiver that can reduce a reproduced audio output according to the magnitude of the noise component of an intended signal included in a received signal. The gain control circuit of the present invention is constituted by a noise level measurement circuit 26 and a preamplifier 25. The noise level measurement circuit 26 measures a noise level in an audio signal Sa1 output from an FM detector 4 and outputs a control signal Sc corresponding to the noise level. The preamplifier 25 reduces an output according a value of the control signal Sc. With the gain control circuit of the present invention, the volume of the speaker is reduced as the noise component in the audio signal Sa1 increases due to a decrease in received electric field strength, and therefore discomfort caused by unpleasant noise can be reduced.
    Type: Application
    Filed: January 25, 2012
    Publication date: April 4, 2013
    Applicant: Icom Incorporated
    Inventor: Tadayoshi Tohoku