Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1980-08-29
1982-12-21
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 721, 360 744, G11B 1518, G11B 1700
Patent
active
043652786
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.
REFERENCES:
patent: Re30416 (1980-10-01), Yasunaga
patent: 3893177 (1975-07-01), Takenaka
patent: 4115821 (1978-09-01), Okada
patent: 4198664 (1980-04-01), Yasunaga et al.
patent: 4288823 (1981-09-01), Yamamoto et al.
patent: 4290090 (1981-09-01), Yamamoto et al.
Kashiwazaki Takashi
Kuriyama Kazumi
Shimoda Koji
Takizawa Yoshiyuki
Pioneer Electronic Corporation
Wolff John H.
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