Patents by Inventor Shinji Kitahara

Shinji Kitahara 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).

  • Noise cancelling system for FM receiver
    Patent number: 4195203
    Abstract: In a noise cancelling system for FM receivers, means is provided whereby a pilot signal of 19 KHz is always detected from a stereo composite signal, whether or not a noise canceller circuit is operated. The 19 KHz pilot signal is injected into a phase locked loop, and a signal of 38 KHz in synchronism with the 19 KHz pilot signal is generated which in turn is injected into the multiplex demodulation circuit. Furthermore, means may also be provided which eliminates, from the 19 KHz pilot signal, noise mixed into the stereo composite signal and having a frequency characteristic of (19/n) KHz (n=1, 2, . . .) and then detects the foregoing pilot signal, thereby achieving satisfactory stereophonic separation.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: March 25, 1980
    Assignee: Toko, Inc.
    Inventors: Koichi Sakai, Satoru Horie, Shinji Kitahara, Kozo Suzuki