Patents by Inventor Terumasa Shimizu

Terumasa Shimizu 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).

  • Automatic ejection system of a car stereo having a detachable grille
    Patent number: 5222007
    Abstract: An automatic ejection system includes a loading device. The automatic ejection system has a grille detector for detecting the removing of a grille from a car stereo and for producing a detachment signal, a tape detector for detecting existence of a tape in the car stereo and for producing a tape signal, and ejection controller responsive to the detachment signal and the tape signal for operating the loading device so as to automatically eject the tape from the car stereo.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: June 22, 1993
    Assignee: Pioneer Electronic Corporation
    Inventors: Takashi Suzuki, Shigeru Munetomo, Terumasa Shimizu
  • Voice versus pulsed tone signal discrimination circuit
    Patent number: 4027102
    Abstract: Two circuit embodiments are disclosed for discriminating between a voice signal and other audio standard (busy and dial tone) signals on a telephone line. One embodiment measures the frequency of the envelope of the audio signal and decides voice (speech) presence if (glottal) frequencies above 50 hz. are present. The second embodiment measures the cyclic frequency of the audio signal and decides voice (speech) presence if frequencies above 600 hz are present, assuming busy or dial tones are 400 hz. Features of the second embodiment include gating of the timer-counter to prevent the cycle-counter from erroneously counting chatter during rise-time and fall-time of an audio signal.
    Type: Grant
    Filed: November 25, 1975
    Date of Patent: May 31, 1977
    Assignee: Pioneer Electronic Corporation
    Inventors: Shizuo Ando, Terumasa Shimizu
  • Automatic telephone answering and message recording apparatus
    Patent number: 3999016
    Abstract: A remote control signal for initiating playback of a previously recorded message tape in an automatic telephone answering apparatus is recorded on the message tape after the recorded messages. The remote control signal causes the tape to be rewound, and the tape position is monitored by a tape counter. The counter is reset to zero at a tape position near the beginning of the rewind operation, but just after the tape portion carrying the remote control signal is rewound and before the message-bearing tape portion is rewound. After the tape is completely rewound, its direction is reversed for reproducing and playing back the recorded message. When the counter counts down to zero during playback, playback is stopped and the apparatus is ready for recording new messages over the previously recorded remote control signal, thereby erasing the signal and permitting the newly-recorded messages to be played back upon receipt of another remote control signal.
    Type: Grant
    Filed: September 13, 1974
    Date of Patent: December 21, 1976
    Assignee: Pioneer Electronic Corporation
    Inventors: Tateki Ueda, Terumasa Shimizu, Shinichi Oguma