KR940011085B1 - Index detecting and playing apparatus for video tape - Google Patents

Abstract

The video tape position searching device for finding the memorized tape position comprises a counter (40) keeping the accumulative counting value; a mode switch (SW1) selecting the write mode or the read mode; address switches (SW2 through SW5) selecting the memory address to save the current counting value from the counter (40) or to read the saved counting value from a memory (20); a comparator comparing the saved value in the memory (20) with the current counting value in the counter (40); a microprocessor (30) controlling the tape driving devices.

Description

List Navigation on Videotape

1 is a specific circuit diagram of the present invention.

2 is a flowchart of operation of FIG.

* Explanation of symbols for main parts of the drawings

R1-R5: resistor LED1-LED5: light emitting element

SW1-SW5: Switch B1-B4: Buffer

E1-E4: exclusive negative logical element A1: logical product

20: memory 30: microcomputer

40: counter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (hereinafter referred to as a VTR), and more particularly, to a video tape list search apparatus for creating a list of programs to be viewed again among programs of a video tape and searching for a created program.

Conventionally, if there is a program that you want to watch again on the video tape, the user resets the counter information about the part you want to watch again to "0" and presses the rewind switch to search for the part you want to watch again. After performing the operation, when the information of the counter became "0", it stopped by pressing the Stop switch and watched by operating the Play switch.

In the above method, only one piece of information can be designated by resetting information of the counter, and there is a problem in that an input switch must be operated each time one operation is performed during the search.

Unlike the above, there are a video index search system and a video address search system that can store a part that you want to see again these days. Marking stores the list of programs to be viewed again on the tape, and at the time of indexing, the control signal on the tape is recognized and found for playback.

However, the above-described VISS and VASS have a problem that the peripheral circuit is complicated by recording the control signal on the tape and recognizing the recorded control signal on the tape.

Accordingly, the present invention provides a videotape list search apparatus capable of recording counter information for a plurality of parts to be viewed again by using a plurality of switches and memories and comparing the recorded information with the counter information. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of the present invention, comprising a mode selection switch SW1 for mode selection means for selecting a read mode and a write mode by performing a switching operation according to an operator's operation, and a plurality of addresses. It is composed of a switch (SW2-SW5) and the address selection means for selecting a plurality of different addresses by each switching operation during pressing, and the counter 40 is configured to detect the rotational direction and the rotational speed of the motor to count and count the tape A travel amount counting means for detecting a travel amount of the plurality of buffers, a plurality of buffers B1-B4 which are enabled only in the light mode by selection of the mode selection means and buffer the output of the tape travel amount detected from the counting means; When the write mode is selected from the mode selection means, the tape travel amount buffered and output from the plurality of buffers B1-B4 is written, and the mode selection means is selected. Memory 20 that reads the stored tape travel amount when the lead mode is selected, and compares the tape travel amount read from the memory 20 with the tape travel amount counted and output from the travel amount counting means. Comparison means for outputting a search detection signal when the position of the signal is searched for; and a microcomputer which is enabled when the read mode is selected from the mode selection means and generates a rewinding and stop control signal according to a signal output from the comparison means ( 30).

The comparing means of the configuration inputs each bit of the tape travel amount sensed by the travel amount counting means to the first input terminal, respectively and simultaneously inputs each bit of the tape travel amount stored in the memory 20 to the second input terminal. Inputs a plurality of exclusive negative logic elements E1-E4 and logic signals output from the plurality of exclusive negative logic elements E1-E4 to output an arbitrary logic state through a plurality of input terminals. And a logical multiplication element (A1) output by logical multiplication.

2 is an operational flowchart of FIG.

Accordingly, the present invention will be described in detail with reference to FIGS. 1 and 2.

If there is a part of the program of the tape to be watched, the mode selector switch SW1 is set to the off mode in the write mode, and one of the plurality of address switches SW2-SW5 is pressed. The mode selection switch SW1 maintains a high state on the line 1 by opening the first power supply VCC applied through the light emitting element LED1 and the resistor R1 with the second power supply GND. The plurality of buffers B1-B4 for inputting the high state to the control terminal on the line 1 are in a transfer state, and the tape travel amount output by the counter 40 is input through the line 6-9. Buffered output to (10-13). The counter 40 calculates the driving amount of the video tape by up or down counting the reel pulse generated according to the driving of a reel motor (not shown). When the tape is driven in the forward direction, the counter 40 is counted up and the tape is driven in the reverse direction. Down counting is performed. Accordingly, the counter 40 performs down counting during tape rewinding.

In addition, the address switch SW2 is turned ON only when pressed, so that the first power supply VCC is connected to the second power source GND, which is applied through the light emitting element LED2 and the resistor R2, to be on the line 2. Turns on the light emitting device LED2 and at the same time generates a low state on the line 2, and the other address switches SW3-SW5 are turned off to the first power source VCC and the second power source ( GND) is kept open on lines 3, 4 and 5.

로 입력하는 메모리(20)는 라이트동작 상태를 유지하는 상태에서 상기 다수의 라인(2-5)상의 어드레스"1110"가 입력될때 상기 다수의 라인(10-13)상에 테이프 주행량을 입력하여 상기 어드레스에 해당하는 번지에 상기 테이프 주행량을 라이트한다.At this time, the high state on the line (1) the lead light terminal

The memory 20 inputting the data into the memory 20 inputs the tape travel amount on the plurality of lines 10-13 when the address " 1110 " The tape travel amount is written to the address corresponding to the address.

If the user wants to watch another program after recording the part that he / she wants to see again as described above and wants to store another part in the memory 20, other address switches SW3-SW5 except for the address switch SW2 When one of the address switches SW3 is selected and pressed, the address switch SW3 turns on the first power supply VCC applied through the light emitting element LED3 and the resistor R3 in the ON state only while being pressed. At the same time as ON, a low state is generated on the line 3, and the remaining address switches SW2, SW4, and SW5 are turned off to a high state on the lines 2, 4, and 5, respectively. Keep it.

The memory 20 then inputs the tape travel amount on the line 10-13 when the address " 1101 " on the line 2-5 is entered in the write operation state, and the tape travels within the address corresponding to the address. Save the quantity.

If there is another part that you want to see again while watching the program, select and push the address switch SW4, and if there is no part that you want to see again, and if there is a part to be linked, the mode selection switch SW1 selects the lead mode. After turning it ON, the portion of the plurality of address switches SW2-SW5 that you want to see again is pushed to the designated address switch SW2. At this time, the mode selection switch SW1 turns on the light emitting device LED1 by conducting the first power supply VCC applied through the light emitting device LED1 and the resistor R1 with the second power supply GND. At the same time, a low state is generated on the line 1. At this time, the plurality of buffers B1-B4 for inputting the low state on the line 1 as a control terminal are turned off to become a blocking state, and the memory 20 Also, the mode changes from the write operation state to the read operation state. In addition, the address switch SW2 is turned on while being pressed to conduct the first power VCC applied through the light emitting element LED2 and the resistor R2 to the second power source GND. Is turned on and a low state is generated on the line 2, and the remaining address switches SW3-SW5 are turned off to generate a high state on the line 3-5. At this time, since the counter 40 is rewinded by the rewinding control signal output from the microcomputer 30, the counter 40 is counted down to output the counting value through the line 6-9.

The memory 20 which inputs the address "1110" on the line 2-5 performs a read operation, reads the tape traveling amount stored at the address corresponding to the address, and outputs it to the plurality of lines 10-13. . Then, the first exclusive negative logic element inputs the current tape travel amount of the least significant bit on the line 10 as the first input terminal and simultaneously inputs the current tape travel amount of the least significant bit on the line 6 as the second input terminal. (F1) and the stored tape travel amount of the next lower bit on the line 11 as the first input terminal and the current tape travel amount of the next lower bit on the line 7 as the second input terminal. The second exclusive negative logic element E2 and the stored tape travel amount of the next higher bit on the line 12 are input to the first input terminal, and the stored tape travel amount of the next higher bit on the line 8 is second. The third exclusive negative logic element E3 input to the input terminal and the stored tape travel amount of the most significant bit on the line 13 are input to the first input terminal and the current tape travel amount of the most significant bit on the line 9. 2 The fourth exclusive negative logic element E4 input to the output terminal compares each of the two input signals and continuously outputs a low state when the two input signals do not match, and generates a high state when both input signals coincide. Output

Logical multiplication devices A1 for inputting the output signals of the first to fourth exclusive negative logic elements E1 to E4 to the first to fourth input terminals are all output of the exclusive negative logical elements E1 to E4. The high state is generated only in the high state, and the low state is output to the generating microcomputer 30 in other cases. Here, the logical multiplication device A1 outputs a search detection signal for detecting whether a desired program position of the videotape is searched. When the output signal is high, a program of a desired position of the videotape is searched. Detect. The microcomputer 30 which maintains the operating state by inputting the low state on the line 1 as an enable terminal generates a rewinding control signal when the output of the AND product A1 is low and generates the AND product. When the output of the element A1 is high, a stop control signal is generated to stop the tape from running. When the stop control signal is generated from the microcomputer 30 and the tape travel is stopped, the counter 40 also stops counting. When the desired program is searched and the play key is pressed, the videotape is played to watch the desired program.

At this time, select and push one address switch (SW3, SW4, SW5) among other address switches (SW3-SW5) to search for another part, and search for another part. It will work.

On the other hand, if there is no part to be watched again and there is no part to be linked, the end of the operation is stopped by watching the program on the tape continuously and rewinding the video tape after stopping until the end detection is activated.

As described above, the present invention has the advantage of recording a plurality of parts to be viewed again using a memory and an advantage of automatically indexing parts to be viewed again by comparing the tape travel amount of the counter with the tape travel amount. There is an advantage that can eliminate the hassle of operating the switch while watching the conventional counter.

Claims (2)

A video tape list searching apparatus of a VTR system, comprising: mode selection means for selecting a read mode and a write mode by switching operation according to an operator's operation, and an address for selecting a plurality of different addresses through switching operation during pressing; Selection means, the driving amount counting means for sensing the rotational direction and the rotational speed of the motor to detect the traveling amount of the tape, and by the selection of the mode selection means is enabled only in the light mode, the traveling amount counting means A plurality of buffers for buffering and outputting the detected tape travel amount, and a tape travel amount buffered and output from the plurality of buffers when the write mode is selected from the mode selection means, and a tape stored when the read mode is selected from the mode selection means. A memory for reading the traveling amount, and from the memory Comparison means for outputting a search detection signal for detecting whether or not the desired program position of the videotape is searched by comparing the tape travel amount read and the tape travel amount counted from the travel amount counting means, and the mode selection; And control means which is enabled at the time of selecting the read mode from the means and receives the search detection signal output from the comparison means to generate a rewinding control signal and a stop control signal. The method of claim 1, wherein the comparison means inputs each bit of the tape travel amount detected from the travel amount counting means to the first input terminal, respectively, and simultaneously inputs each bit of the tape travel amount stored in the memory. A plurality of exclusive negative logic elements (E1-E4) and a plurality of exclusive negative logic elements (E1-E4) outputting an arbitrary logic state by inputting and comparing input terminals, respectively, and a plurality of input terminals. Apparatus characterized in that consisting of a logical multiplication device (A1) to be output by multiplying and output.

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