US4404604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting a non-recorded segment on magnetic tape
Assignee: Pioneer Corp
•
Filing: 1981-04-14
•
Granted: 1983-09-13
•
Expires: 2001-04-14
Abstract
Abstract A device for accurately detecting non-recorded segments on a magnetic tape in fast-forward and rewind modes. The output of a magnetic head is coupled through an equalizer amplifier and limiter amplifier to convert it to a digital pulse signal which is applied to the clear input of a counter the clock input of which is coupled to an oscillator. A higher order output bit is connected to the clock input of a flip-flop which controls solenoids for setting the fast-forward and rewind modes. When no pulses of the digital pulse signal are received within a predetermined period, indicative of the presence of a non-recorded segment, the counter produces an output signal which operates the flip-flop.
Inventors
- 👤 Yoshiharu Ueki
- 👤 Shouzaburou Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:55
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/22; G11B15/00; G11B15/02; G11B15/026; G11B15/05; G11B15/087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A device for detecting non-recorded segments of a predetermined minimum length on a magnetic tape comprising: oscillator means for producing clock pulses of a predetermined frequency; multi-bit counter means having a clear input terminal and a clock terminal, said clock pulses being applied to said clock input terminal; and means for applying a digital signal corresponding to a reproduced signal to said clear input terminal, an output signal indicative of the presence of a non-recorded segment being produced at a higher order bit output of said counter means.
Claim 2
Independent Claim
88 words
A device for detecting non-recorded segments of a predetermined minimum length on a magnetic tape comprising: oscillator means for producing clock pulses of a predetermined frequency; multi-bit counter means having a clear input terminal and a clock terminal, said clock pulses being applied to said clock input terminal; and means for applying a digital signal corresponding to a reproduced signal to said clear input terminal, an output signal indicative of the presence of a non-recorded segment being produced at a higher order bit output of said counter means.
Claim 3
Dependent Claim
56 words
The detecting device of claim 1 wherein said means for applying a digital signal corresponding to a reproduced signal comprises an equalizer amplifier having an input coupled to an output of a magnetic head and a limiter amplifier having an input coupled to an output of said equalizer amplifier, said limiter amplifier outputting said digital signal.
Claim 4
Dependent Claim
43 words
The device as claimed in claim 1 or 2 further comprising a flip-flop having a clock input coupled to receive said output signal from said counter means, said flip-flop having an output coupled to operate solenoids controlling at least fast-forward and rewinding modes.
References Cited (Backward Citations)
US3461249A
Cited
US3573393A
Cited
US3893177A
Cited
USRE30416E
Cited
US4151566A
Cited
US4270152A
Cited
US4323935A
Cited
US4288823A
Cited
US4290090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |