Patents by Inventor Eiichi Funasaka

Eiichi Funasaka 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: 4229619
    Abstract: A multi way speaker system comprises an amplifier, frequency dividing network including a plurality of filters, a plurality of speakers respectively responsive to the output signals of the filters, and a summing circuit responsive to the output signals of the filters for producing a composite signal to be fed back to the input of the amplifier to establish a negative feedback loop. Because of the feedback loop undesirable influences by various elements included in the filters are diminished and thus the speakers reproduce audio frequencies with high fidelity. At least one equalizer may be employed in the feedback loop, while auxiliary filters may be used in such a manner that the output terminals of the auxiliary filters are connected to only the summing circuit so that the output signals of the auxiliary filters are added to an output signal of at least one filter of the frequency dividing network.
    Type: Grant
    Filed: October 31, 1978
    Date of Patent: October 21, 1980
    Assignee: Victor Company of Japan, Limited
    Inventors: Nobuaki Takahashi, Eiichi Funasaka, Masanobu Shinozaki, Yasuo Kaizu