KR0165283B1 - Method of search using tape residue - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for searching recorded contents in a tape recording / reproducing apparatus. In particular, a tape in which a search speed is improved by adding an absolute address to a tape by using a total time and a playable time of the tape calculated using the remaining amount of tape. A search method comprising: calculating a total time of a tape and a reproduced time to date using the remaining amount of the tape; Setting the total number of addresses of the tape; Calculating an address section signal and a current address of the tape by using the data obtained in the calculation step and the setting step; Comparing the current address obtained in the calculating step with the target position address to be searched; Determining the driving direction of the tape according to the comparison result in the comparing step and moving to the search position.

Description

Search method using the remaining tape

1 is a schematic block diagram of a tape recording and reproducing apparatus to which a tape searching method according to the present invention is applied.

2 is a flow diagram illustrating a search method according to the present invention.

* Explanation of symbols for main parts of the drawings

10: kiss cans 20: micom

30: servo circuit 40: capstan motor

50: reel sensor unit 50A, 50B: winding reel, supply reel sensor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for searching recorded contents in a tape recording / reproducing apparatus. In particular, a tape in which a search speed is improved by adding an absolute address to a tape by using a total time and a playable time of the tape calculated using the remaining amount of tape. It relates to a search method.

In the conventional case, when a video tape recorder (hereinafter referred to as a VTR) wants to see a desired portion of a recording of a tape, the program is searched by operating the fast rewind (REW) and play (PLAY) switches. If you want to see a specific part repeatedly, you have to repeat the above operation process continuously.

However, when the program search method as described above is performed manually, it takes a long time to find a desired part by alternately operating the fast rewinding key and the playback switch, and it is quite difficult to find the exact position.

In order to solve this problem, there was a case in which a device capable of detecting the rotation of the tape and counting the current position according to the rotation degree was configured to accurately search the corresponding section. When the device must be provided separately and the repetition period is designated, there is a hassle of having to initialize each time.

Therefore, when recording or playing back the program, the index signal is recorded at the required position, and when the user wants to find the section again, the VTR transfers the tape as fast as possible and detects the corresponding recording signal. The Video Index Search System (hereinafter referred to as VISS) is used. The system using this function changes the duty ratio of the control pulse used for the control of the capstan motor of the VTR from about 69% to about 25%, recording 2-3 seconds.

However, in the conventional search method using an index, after placing an index mark on a tape, an index number is set, and then a FORFORN or REWIND key is selected to find a desired position on the tape. Has the following problems:

First, the index mark must be loaded on the recording section of the control signal on the tape. Second, since the position of the index on the tape is represented as a relative position at the time of setting the index search, the position cannot be easily understood from the user's point of view.

Accordingly, an object of the present invention is to solve the problems as described above, and by using the absolute address method of giving an absolute position to the tape by using the time according to the remaining amount of the tape, it is possible to search the data at high speed accordingly. To provide a search method.

In order to achieve the above object, the present invention comprises the steps of calculating the total time of the tape and the reproduced time to the present time using the remaining amount of the tape; Setting the total number of addresses of the tape; Calculating an address section signal and a current address of the tape by using the data obtained in the calculation step and the setting step; Comparing the current address obtained in the calculating step with the target position address to be searched; And determining the moving direction of the tape according to the comparison result in the comparing step and moving to the search position.

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

1 is a schematic block diagram of a general tape recording / reproducing apparatus for applying the tape searching method according to the present invention.

1 shows data input from a data input unit having a form such as a remote controller or a key input unit attached to a tape recording / playback apparatus for remotely inputting data from a key input unit under the control of the microcomputer 20. Keyscan circuit used to scan the data, 20 is a microcomputer to control the overall operation of the components in the device, 30 is a servo circuit for detecting the operating state of the motor, 40 is a capstan motor used to rotate the tape 50 is a reel sensor unit used to detect the remaining amount of the tape consists of a take-up reel sensor and a supply reel sensor.

The operation of a general recording / reproducing apparatus having the above configuration is as follows.

The kisscan circuit 10 periodically checks data by scanning the data input unit to check whether data is input from a data input unit (not shown). If there is data input from the data input unit, the kisscan circuit 10 receives the data and transfers the data to the microcomputer 20.

The microcomputer 20 performs a function corresponding to the data transmitted from the kisscan circuit 10. At this time, if the input data designates a specific position on the tape, the microcomputer 20 is wound around the supply reel and winding reel from the reel sensor unit 50. Receiving information on the amount of tape present, the microcomputer 10 calculates the remaining amount of tape.

In addition, the microcomputer 20 receives a data signal Capstan FG including information on the rotation speed of the capstan motor 40 from the servo circuit 30. Using the data obtained in this way, the driving direction of the tape is determined according to the absolute address input by the user, and the high-speed search to a specific position can be performed according to this value.

This process will be described in more detail with reference to FIG.

First, a method of calculating an address used in the present invention will be described.

Since the address calculation method can calculate the total time of the tape and the current playback time by using the remaining amount of tape calculation method, the address interval used in the present invention in the current tape amount from the current playback time of the tape and the total tape time. Subtract the time multiplied. In other words,

Current playing time of the tape

= Total tape time-time according to the amount of tape remaining

Various methods of calculating the remaining amount of the tape used in the above are disclosed. For example, the method of determining the VTR tape type and remaining amount calculating method of Patent Publication No. 92-5237 can be used.

After calculating the current reproduced time, the address section signal is calculated using the total tape time. The address section signal is obtained by dividing the total time of all tapes by the total value of addresses to be obtained.

For example, if 100 addresses are to be set on a 120-minute tape, one address section signal is obtained as follows (when the recording mode is SP (Standard Play)).

At this time, if the target tape for which the address is calculated has a different recording mode for each section, since the value of the address section signal varies for each section, it is assumed that the entire section is recorded at the same speed.

Thus, if the address is set in the same manner as above, the T-120 minute tape will have 100 addresses. Of course, if the whole section is divided into 120 addresses, the time interval per section will be 1 minute. If the tape address is set in this way, the tape search method for searching the data recorded in the desired position using the tape will be described with reference to the flowchart of FIG.

In step 100, which is a starting step, the total amount of the tape and the playing time are calculated based on the remaining tape calculation method. When the total amount of the tape and the playing time are calculated, a value for determining how many addresses to divide the entire tape into is input (step 110).

When the number of sections is set, the section time of the tape and the current address are calculated using the above-described formula for calculating the address section time (step 120). Since the remaining amount is calculated in step 100, the absolute address of the current position can be easily calculated by using the remaining amount and the segment time.

After operation 120, the microcomputer 20 determines whether a user's search command is input using the kisscan circuit 10 (operation 130). If there is no input of the search command by the user, the process ends, and if there is an input, an address to search for is received through the input means (step 140).

If an address to search for is input, an address time to search for is calculated (step 150). The address time to search can be obtained by multiplying the address interval time by the value of the address to search. When the time is calculated as described above, before performing the search, the address of the current location is compared with the size of the input address to search. The comparison of addresses is because the running direction of the tape must be changed in accordance with the value of the address. Therefore, if the address to be searched is smaller than the current address, rewinding is performed (step 170).

If the address to be searched is larger than the current address (step 180), since the object to be searched is located in the advancing direction of the tape, the tape is forwarded (step 190) to arrive at the search position. Step 200). However, if the current address and the address to be searched are the same, the search process is terminated because no further search is necessary since the target position and the current location are the same. At this time, the position calculation of the tape moving in the reverse direction or the advancing direction runs in the forward or backward direction for a time corresponding to the difference between the address of the current position and the address of the target position input by the user by the address section signal. If it is located, it becomes the position to search.

Looking at the practical use example using this search method is as follows.

When the total address is set to 100 for a 120-minute tape, the tape recording / reproducing apparatus counts up the addresses at intervals of 1 minute and 12 seconds at the time of playback and displays the addresses on the lower right side of the screen. If the address currently displayed on the screen is 51, if the user wants to search the contents of the point at address 79, the user stops the currently playing tape, inputs a search key, and then enters an address to search for. Since the address of the position to be searched has a larger value than the address of the current position, the running direction of the tape is a forward direction, and the tape is driven at high speed by the time obtained by multiplying the difference between the address of the target position and the address of the current position by the address section time To the location you want to search.

As described above, the present invention, unlike the VISS relative position search method using the total time of the tape and the regenerated time calculated from the remaining amount of tape, gives the tape an absolute address so that the user can Since the user can easily search for a specific location, the user can avoid confusion and improve the search speed by using the remaining amount during the search.

Claims (2)

Calculating the total time of the tape and the reproduced time to date using the remaining amount of the tape; Setting the total number of addresses of the tape; Calculating an address section signal of the tape and a current address using the data obtained in the calculation step and the setting step; Comparing the current address obtained in the calculating step with the target position address to be searched; And moving to a search position by determining a driving direction of the tape according to the comparison result in the comparing step. The search method according to claim 1, wherein the address indicates an absolute position on the tape.