The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 1982
Filed:
Aug. 29, 1980
Yoshiyuki Takizawa, Tokorozawa, JP;
Takashi Kashiwazaki, Tokorozawa, JP;
Koji Shimoda, Tokorozawa, JP;
Kazumi Kuriyama, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A device for detecting non-recorded portions on a magnetic tape including a circuit for preventing malfunctions in the detecting device. The output from a playback head of a tape recorder is amplified then passed through a malfunction preventing circuit which passes the signal if its amplitude is above a preset level for at least a predetermined period of time. The output signal from the malfunction preventing circuit is waveform shaped then rectified and passed through a charge/discharge circuit to a solenoid energizing circuit. The malfunction preventing circuit includes a variable impedance element such as a field effect transistor coupled between an output terminal of the circuit and ground with the impedance of the element varied in accordance with the magnitude of the input signal with a delay added. The waveform shaping circuit, the rectifying circuit and the charge/discharge circuit convert the output of the malfunction preventing circuit into a switching waveform used to control a solenoid which sets the tape speed of the tape recorder such that the tape is run fast when no signal is present on the tape.