Tape timer apparatus for video tape recorder
US4630137A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1983 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Oct 21, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tape timer apparatus is disclosed. Apparatus is provided for producing frame pulses indicating a frame period in a running tape and for producing a tape direction signal. An up/down counter counts up or down, as determined by the tape direction signal, in response to the frame pulses. A detecting circuit generates a detection signal indicating whether the frequency of the frame pulse has exceeded a predetermined frequency. A circuit is also provided for dividing the frame pulses by a predetermined number and generating a single frequency divided pulse each time the predetermined number of frame pulses is generated. A selection circuit selects, in accordance with the detection circuit, either the frame pulse or the frequency divided pulse. A microcomputer receives the pulse from the selecting means as an interruption demand pulse and calculates the tape time on the basis of the value counted by the up/down counter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.