KR940005842B1 - Time-data recording circuit and display time checking circuit - Google Patents

Abstract

The recording circuit recording the runtime information in the vertical blanking period includes a timer (10) generating one pulse perminute; a multiplexier (30) selecting data (d0-d6) sequentially; a microprocessor (40) producing the command to record the runtime information. The runtime displaying circuit comprises a vertical blanking detector (12) finding the blanking signal; a level detector (50) extracting the time information from the vertical blanking signal; a microprocessor (2) controls a chromatic means (5) to display the runtime information on the screen.

Description

Time information recording circuit and video tape display time check circuit

1 is a block diagram of a conventional time check circuit.

2 is a block diagram of a time information recording circuit of the present invention.

3 is a block diagram of a time check circuit of the present invention.

4 is a waveform table of an asynchronous counter of the present invention.

5 is a multiplexer table of the present invention.

* Explanation of symbols for main parts of the drawings

10: timer 11: tape playback circuit

12: vertical blanking signal detection circuit 20: asynchronous counter

30: multiplexer 35: switch

40: micom 50: level detection circuit

60: recorder

The present invention relates to a time information recording circuit and a video tape display time check circuit, and more particularly to a circuit for displaying a display time on a screen after applying a signal to the video tape itself to interpret the signal.

Conventionally, as shown in FIG. 1, a synchronous separator (1) for separating horizontal and vertical synchronouss, a system control micom (2), and the microcomputer (2) generate and supply characters according to desired information. A character generator 3, a time generator 4 that generates time and provides it to the microcomputer 2, a chroma unit 5 for driving a color signal, and a CPT drive unit for driving a CPT 8 ( 6) and CPT (8) for displaying the final screen.

In the above configuration, the horizontal synchronization signal and the vertical synchronization signal output through the synchronization separator 1 are applied to the microcomputer 2 for system control, and the microcomputer 2 detects whether the video is displayed or not and displays the video. When signal 7 is applied, time generator 4 is activated.

When character information corresponding to the time generator 4 is generated in the character generator 3, the microcomputer 2 applies an RGB signal and a blanking signal to the chroma unit 5 for driving the color signal.

The signal passing through the chroma unit 5 is applied to the CPT drive unit 6 so that the character information set on the screen of the CPT 8 is displayed. That is, when the video tape is rotated and rotated, the time generator 4 operates to display information on the time as long as the tape has been rotated.

In this conventional technique, when the user watches a video and then turns it off and then operates the video to watch the video, the time generator 4 starts the timer again from the beginning to watch some of the total video viewing time so that some extra time remains. There is a problem in providing useful time information only by not watching the video from beginning to end. In addition, when entering the operation mode, such as double speed, still mode, re-view, etc., there is a difficulty that a certain time generator should be operated according to the mode.

Accordingly, the present invention has been made to solve the above-mentioned general problems, and an object of the present invention is how the video tape is operated from the beginning in the operation of the video tape forward or backward mode, re-display after power off, and the like. It is to provide a one-hour information recording circuit and video tape display time check circuit to check the time and display it so that the user can be informed the time of operation of the video tape at any time.

Preferred embodiments for achieving the object of the present invention described above in detail by the accompanying drawings as follows.

2 is a time information recording circuit diagram of the present invention, wherein a timer 10 is configured, and the timer 10 is configured such that one pulse 15 is generated per minute, and data (d ₀ ) is generated according to one input. -d ₆ ) is configured a multiplexer 30 for outputting one.

The multiplexer 30 is connected to a microcomputer 40 which operates when a vertical blanking signal 41 for sequentially selecting input data d _{0 to} d ₆ is input.

A switch 35 is connected to the output terminal of the multiplexer 30 to connect the level detection circuit 50 and the recorder 60.

When the vertical blanking signal 51 is input, the level detection circuit 50 transmits a high signal to the switch 35 to turn on the switch 35.

The recorder 60 inserts the data sent from the multiplexer 30 into the vertical blanking signal 50 in a period of 2H ≒ 128Msec (1H ≒ 64Msec) of 20H 1280Msec which is the vertical return time.

3 is a schematic diagram of a tape display time check circuit of the present invention, wherein the tape reproducing circuit 11 detects and reproduces an image signal on a screen by a microcomputer 2 and vertical blanking which extracts only a vertical blanking signal from the image signal. A signal detection circuit 12 and a level detection circuit 50 which receives the vertical blanking signal and transfers only time data to the microcomputer 2 are connected in series.

The following structure is the same as the conventional structure mentioned above.

In the above configuration, the operation and effect of these will be described below. In the time information recording circuit of FIG. 2, time information is inserted at the vertical retrace time of the video tape. At this time, one pulse 15 per minute generated by the timer 10 enters the input C ₀ of the asynchronous counter 20 and generates seven data up to d ₀ -d ₆ . The seven data (d ₀ -d ₆ ) are used to produce 2 ⁷ outputs.

The seven data d ₀ -d ₆ enter the input of the multiplexer 30, and the multiplexer 30 sends only one output.

The outputs of the multiplexer 30 are sequentially selected one by one using the selection signals S ₀ -S ₂ of the microcomputer 40.

4 shows the above seven data (D ₀ -D ₆ ), assuming that the tape length is less than 120 minutes, the time information up to 120 minutes is converted into binary.

5 shows that the output of the multiplexer 30 is selected according to the selection outputs S ₀ -S ₂ of the microcomputer 40.

The select outputs S ₀ -S ₂ of the microcomputer 40 operate when the vertical blanking signal 51 goes from the low level to the high level.

At this time, when the vertical blanking signal 51 is input from the level detecting circuit 50, a high signal is output to turn on the switch 35.

When the switch 35 is turned on, time information which is output data of the multiplexer 30 is inserted into the recorder 60 during the vertical blanking period.

In FIG. 3, the tape display time check circuit outputs a horizontal synchronizing signal and a vertical synchronizing signal output through the synchronizing branch 1 to the system control microcomputer 2 and detects image information from the tape reproducing circuit 11. The vertical blanking signal detection circuit 12 inputs the vertical blanking signal to the microcomputer 2. Then, the microcomputer 2 receives the vertical synchronization signal, the horizontal synchronization signal and the vertical blanking signal and outputs only time data. At this time, the time data of the level detection circuit 50 and the tape time check on / off signal are input.

When character information corresponding to this time information is generated by the character generator 3 at the time of the tape time check, the microcomputer 2 is applied to the chroma unit 5 for driving the RGB signal and the blanking signal as color signals.

The signal passed through the chroma unit 5 is input to the CPT drive unit 6, and the character information set on the screen of the CPT 8 is displayed.

As described above, the present invention can check the time of how much the user is watching the tape using the video tape display time check circuit, and remembers the time of the scene that he / she wants to see again by using this time check function. There is a beneficial effect of returning the tape to position to allow re-viewing.

With this feature, you can even detect a time tape so that it automatically rewinds when you finish watching a video, even if the tapes are not all rolled up.

Claims (2)

A timer 10 for generating one pulse 15 per minute, an asynchronous counter 20 for generating seven data (d _0- d ₆ ) by receiving the output of the timer, and the asynchronous counter signal A multiplexer 30 for receiving one output, a microcomputer 40 for controlling the output signal of the multiplexer, a switch 35 for selectively transmitting the output signal of the multiplexer to the recorder 60, and vertical blanking. And a level detection circuit (50) for controlling the on / off of the switch by receiving a signal (51) so that the video information is always displayed as long as the video tape is turned. A tape reproducing circuit 11 for detecting a video signal and reproducing it on a screen, a vertical blanking signal detecting circuit 12 for detecting only a vertical blanking signal from the video signal, and receiving only the time data by receiving the vertical blanking signal. A level detection circuit 50 for transmitting the color signal, a chroma unit 5 for driving the color signal by receiving the color signal from the microcomputer, and a CPT drive unit 6 for driving the CPT 8 in response to the chroma signal. The video tape display time check circuit, characterized in that to display the operation time of the tape, including.