Patents by Inventor Takahiko Kozaki

Takahiko Kozaki 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).

  • PCM coder and decoder circuit having digital balancing network
    Patent number: 4787080
    Abstract: A PCM coder and decoder circuit for use in a subscriber line interface circuit of a telephone communication system has a digital balancing network for removing any echo signal. The digital balancing network is formed by series-connecting a first balancing circuit having characteristics corresponding to the fixed characteristics of a coder, decoder, etc. and a second balancing circuit having characteristics corresponding to variable characteristics of an external circuit including two-wire transmission line which is connected to the coder and decoder circuit. Thus, a replica of an echo signal is precisely produced, and the circuit configuration is simplified.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: November 22, 1988
    Assignees: Hitachi Ltd., Hitachi Micro Computer Eng. Ltd.
    Inventors: Kazuo Yamakido, Takahiko Kozaki, Shigeo Nishita, Kenichi Ohwada