KR0132974B1 - Tape control apparatus for video cassette tape recorder - Google Patents

Abstract

A method for processing an initial operation of a video tape recorder, wherein a CFG(Capstan Frequency Generator) pulse is counted to calculate the remaining of the tape, is disclosed. The method comprises a step of determining whether the reel pulse is inputted or not for two seconds by performing a C-FF mode or C-REW mode; a step of counting the number of CFG pulses for one reel pulse to perform the C-FF mode or the C-REW mode in case that the reel pulse is inputted; a step of generating an alarm signal in case that the reel pulse is not inputted; and a step of removing a sensor during the C-FF mode operation or the C-REW mode operation to obtain the data required at a remaining calculation function.

Description

Initial processing method for tape insertion of video tape recorder

The present invention eliminates the start sensor and the end sensor, and calculates the remaining amount of the tape using the reel pulse signal generated by the rotation of the supply reel and take-up reel and the capstan frequency generator (CFG) signal generated by the rotation of the capstan motor. A video tape recorder having a function of providing a video tape recorder, the present invention relates to an initial processing method for inserting a tape of a video tape recorder so that the current remaining amount of the tape can be immediately checked when the tape is settled on the deck portion.

In general, a tape tape does not travel when driving in the reverse direction at the start of the tape or in the forward direction at the end of the tape, so that the tape is subjected to a lot of tension, causing breakage or elongation. In addition, a lot of overload is applied to the motor that drives the tape and is damaged.

Therefore, the video tape recorder is provided with detection means capable of detecting the start portion and the end portion of the tape.

The conventional detection means described above detects the start portion and the end portion of the tape by using a transparent lead tape and an optical sensor in the start portion and the end portion of the tape.

That is, a light emitting element is installed in the middle of the deck portion where the tape is seated, and on both sides of the deck portion, a light receiving element for start portion detection and an end sensor light receiving element for end sensor are respectively installed. When it is seated, the light output from the light emitting element is made to enter the light receiving element through the tape.

In the conventional video tape recorder provided with such a detection means, since the light output from the light emitting element is incident on the light receiving element for the start portion detection through the lead tape in the start portion of the tape when the start portion of the tape is used. The light receiving element detects the start portion of the tape, and the microcomputer controlling the video tape recorder prevents the tape from performing reverse travel in accordance with the detection signal of the light receiving element for the start portion detection.

In the case of the end portion of the tape, since the light output from the light emitting element is incident to the end portion receiving light receiving element through the lead tape at the end portion of the tape, the end portion receiving light receiving element detects the end portion of the tape, and The microcomputer controlling the tape recorder prevents the tape from carrying out forward travel in accordance with the detection signal of the light-receiving element for detecting the end portion.

That is, when the end portion detecting light receiving element detects the end portion of the tape while the tape is running in the forward direction in the forward playback mode and the forward high speed travel mode, the tape is stopped, and the reverse playback mode and reverse high speed When the start portion detecting light receiving element detects the start portion of the tape while the tape is traveling in the reverse direction in the traveling mode or the like, the tape is stopped so that the tape and the motor driving the tape are not damaged.

In the above-described conventional technology, the light emitting device is fixed by protruding a support to an intermediate portion of the deck, and the light receiving device is fixed to the side of the deck by using a separate printed circuit board (PCB).

Therefore, the assembly process of the deck part becomes complicated according to the fixing positions of the light emitting element and the light receiving element, which increases the production cost of the product and decreases the productivity.

In order to prevent external light from being incident on the light receiving element, a separate light blocking means should be provided, and since a free space for providing such light blocking means has to be secured, it has caused a lot of trouble in minimizing the deck part.

In addition, the light emitting element and the light receiving element are installed in the deck portion, and since the light of the light emitting element should be incident to the light receiving element through the rig tape of the tape in the tape cassette, the light output from the light emitting element in the tape cassette through the lead tape There is a problem in that a separate light passing hole must be formed in a path incident to the light receiving element.

Therefore, in recent years, instead of the above detection means, software that calculates the remaining amount of tape by using the reel pulse signal generated by the rotation of the supply reel and take-up reel and the CFG signal generated by the rotation of the capstan motor is used. .

As the conventional techniques for calculating the remaining amount of the tape using the software, Korean Patent Publication Nos. 94-16067, Korean Patent Publication No. 91-3650, and the like are known.

According to the conventional technique, the number of CFG signals generated when the supply reel and / or the take-up reel is rotated once is counted, and the remaining amount of the tape, the start part and the end part are counted using the counted number of CFG signals. To detect.

However, the above-described conventional technique does not immediately detect the remaining amount of the tape, the start portion and the end portion when the tape is seated on the deck portion, and the supply reel, take up reel and capstan motor are performed while performing a predetermined operation mode. By using the reel pulse signal and the CFG signal generated when rotating, the remaining amount of tape and the start part and the end part are detected.

Therefore, when the tape on which the start part and the end part are located is seated on the deck part, the start part and the end part of the tape are not immediately recognized, which causes a lot of tension on the tape and damages it, and the motor driving the tape is overloaded. Frequently applied cases were damaged.

In other words, when the user moves the tape backward by pressing the reverse play or reverse fast drive key at the initial position of the tape on which the start part is located, the reel pulse signal is generated because the tape does not travel in the reverse direction as the start part. You will not.

As the reel pulse signal is not generated as described above, the video tape recorder continues to drive the driving motor of the tape. As a result, a lot of tension is applied to the tape and the tape is damaged, and an overload is applied to the motor driving the tape.

In addition, even when the user moves the tape in the forward direction by pressing the forward playback or forward high speed key, etc. in the initial stage of seating the tape on the deck part, the tape does not travel in the forward direction as the end part. Tension is applied and damaged, and overload is applied to the motor driving the tape and damaged.

Accordingly, an object of the present invention is to provide an initial processing method for inserting a tape of a video tape recorder which enables to obtain data necessary for calculating the remaining amount of the tape while driving the tape at the beginning of inserting the tape into the deck portion.

According to the initial processing method of the present invention for achieving this object, it is determined whether a reel pulse signal is generated while driving the tape at the beginning of the tape insertion to the deck portion, and the tape is reversed when the reel pulse signal is not generated. It is determined whether a reel pulse signal is generated while traveling in the direction.

If the reel pulse signal is not generated even when the tape is run in the opposite direction, an error is displayed as an error has occurred.

When the reel pulse signal is generated, count the number of CFG signals generated when the supply reel and take-up reel are rotated by one reel pulse signal while continuing to run the tape, and compare the counted CFG signals. Drive the tape forward or reverse.

The tape is stopped after reel pulse signal and CFG signal generated by running the tape in the forward or reverse direction to obtain the necessary data for calculating the remaining capacity of the tape and detecting the start and end parts. Let's do it.

Therefore, according to the present invention, even if the tape located at the start portion or the tape positioned at the end portion is seated on the deck portion, it is possible to prevent the damage of the tape and the traveling motor by accurately determining the state of the tape at the initial stage of the tape mounting. .

1 is a block diagram showing the configuration of a video tape recorder applied to the initial processing method of the present invention.

2 is a signal flow diagram showing an initial processing method of the present invention.

* Explanation of symbols for main parts of the drawings

10: video tape recorder 12: microcomputer

14 deck portion 16 capstan motor

18: peripheral circuit

Hereinafter, with reference to the accompanying drawings will be described in detail the initial processing method of the tape insertion of the video tape recorder of the present invention.

1 is a block diagram showing the configuration of a video tape recorder to which the initial processing method of the present invention is applied.

Here, reference numeral 10 denotes a video tape recorder.

The video tape recorder 10 determines the remaining amount of the tape, the start part, and the end part using the supply reel pulse signal, the take-up reel pulse signal, and the CFG signal, which are input when the input tape is driven. A microcomputer 12 for controlling the operation of the recorder 10, a deck 14 for generating a supply reel pulse signal and a take-up reel pulse signal when the tape travels, and a CFG signal generated by traveling the tape. A capstan motor 16 and a peripheral circuit 18 that performs a predetermined operation under the control of the microcomputer 12.

When the video tape recorder 10 configured as described above operates the key input unit (not shown in the drawing) in a state where the tape is seated on the deck portion, the microcomputer 12 uses a peripheral circuit ( 18) to perform an operation according to a predetermined operation command and to control the capstan motor 16 to drive the tape seated on the deck portion (14).

As the tape travels in this way, the supply reel and take-up reel rotate together with the tape running to generate a supply reel pulse signal and a take-up reel pulse signal, and a CFG signal is generated as the capstan motor 16 rotates. Is input to the microcomputer 12.

Then, the microcomputer 12 calculates the remaining amount of the tape using the input supply reel pulse signal, the take-up reel pulse signal, and the CFG signal, and controls the running operation of the tape according to the calculated remaining amount of the tape.

2 is a signal flow diagram illustrating an initial processing method of the present invention.

As shown therein, the microcomputer 12 of the video tape recorder 10 performs the C-FF mode and / or the C-REW mode in step S10 when the tape is seated in the deck portion 14. It is determined whether a reel pulse signal is generated while driving the tape at a high speed.

Here, the C-FF mode and the C-REW mode performed by the present invention will be described in detail.

In general, there are FF (Fast Forward) mode and REW (REWind) mode as an operation mode for driving a tape in a video tape recorder.

In the FF mode and the REW mode, the tape travels at high speed without reproducing the signal recorded on the tape. In the FF mode, the take-up reel is rotated at a high speed so that the tape can be driven forward at a high speed. It rotates at high speed and drives the tape in reverse direction at high speed.

In addition, playback modes such as a forward play mode, a fast forward picture search (FPS) mode, a reverse play mode, and a rewind forward picture search (RPS) mode in an operation mode for driving a tape drive the video head of the head drum while driving the tape at a constant speed. The recorded signal must be reproduced by contacting.

Therefore, in the regeneration mode, the capstan motor is driven at a constant speed, and the tape is driven at a constant speed in accordance with the driving of the capstan motor.

In the present invention, it is necessary to drive the tape at a high speed, but it is not necessary to reproduce the signal recorded on the tape, so that a predetermined signal is not reproduced from the tape while performing the FPS mode and the RPS mode of driving the tape at a constant speed with a capstan motor. The tape is driven in a non-operating mode, and a supply reel pulse signal, a take-up reel pulse signal, and a CFG signal are generated when the tape is driven.

In order to distinguish the operation mode in which the FPS mode and the RPS mode are not reproduced from the tape while the FPS mode and the RPS mode are distinguished from the FPS mode and the RPS mode, the C-FF mode and the C-REW mode are hereinafter abbreviated.

In step S10, the tape driving is performed at high speed while driving the capstan motor 16 by performing the C-FF mode in step S11, for example, within 2 seconds, for example, within 2 seconds. It is determined whether or not the reel pulse signal is input from the deck unit 14 within the same time.

Here, since the tape is first drawn out of the video tape recorder after performing the REW mode when the forward driving is completed, the tape is in the start position.

When the reel pulse signal is not input from the deck unit 14 within the predetermined time in step S13, the microcomputer 12 performs the C-REW mode in step S15 to run the tape backward at a high speed. In step S17, it is determined whether the reel pulse signal is input from the deck unit 14 within the preset 2 seconds.

If the reel pulse signal is not input in either step S13 or step S17, the microcomputer 12 generates a warning message in step S40 and notifies the user as a bad tape or an error.

When the reel pulse signal is input in the step S13 or step S17, the microcomputer 12 generates when the supply reel and take-up reel in which the reel pulse signal is generated in step S20 rotate once. The number of CFG signals to be counted.

That is, the reel pulse signal is generated one time when the supply reel and take up reel are rotated once. The reel pulse signal counts the number of CFG signals inputted during one cycle of the supply reel pulse and the take up reel pulse signal.

When the counting of the CFG signal is completed, the number of CFG signals counted during one cycle of the supply reel pulse signal and the take-up reel pulse signal is compared.

As a result of the comparison, when the number of CFG signals counted during one cycle of the supply reel pulse signal is less than the number of CFG signals counted during one cycle of the take-up fill pulse signal, the tape wound on the supply reel side is wound on the take-up reel side. As less than the tape, the microcomputer 12 performs C-REW to drive the tape in the reverse direction at high speed.

If the number of CFG signals counted in one cycle of the supply reel pulse signal is greater than the number of CFG signals counted in one cycle of the take-up reel pulse signal, the tape wound on the supply reel side is wound on the take-up reel side. As more, the microcomputer 12 performs C-FF to drive the tape at high speed in the forward direction.

In this manner, while the tape is being driven in the C-FF mode or the C-REW mode, the microcomputer 12 displays the remaining amount of tape, including the size of the hub on which the tape is wound as described in step S30. It ends after obtaining the predetermined data required for detection.

After obtaining the predetermined data necessary for calculating the remaining amount of the tape as described above, the predetermined operation mode according to the input of the key signal is performed.

As described above, the present invention performs the C-FF mode or the C-REW mode while inserting the tape and seats the deck unit, and then obtains predetermined data necessary for calculating the remaining amount of the tape, and then operates the predetermined mode according to the key input. Even if the tape on which the start or end is located is seated on the deck, the microcomputer can accurately determine the current amount of tape remaining and perform the corresponding operation to prevent the tape and the motor driving the tape from being damaged. have.

Claims (3)

A reel pulse input determination step of determining whether a reel pulse signal is input while driving the tape at an initial stage when the tape is seated on the deck unit; A warning step of notifying an error occurrence by outputting a warning message when the reel pulse signal is not input in the reel pulse input determination step; A counting step of counting the number of CFG signals generated per one period of the reel pulse signal when the reel pulse signal is input in the reel pulse input determination step and running the tape in a direction according to the counted number of CFG signals; The tape insertion of the video tape recorder, characterized in that the terminal ends after obtaining the data necessary for calculating the remaining amount of tape by the number of reel pulse signals and CFG signals generated while driving the tape according to the number of CFG signals counted in the step. Initial treatment in city. The method of claim 1, wherein the reel pulse input determination step; While driving the tape at high speed in the forward direction at the high speed in the EPS mode, the reel pulse signal is not input in the forward high speed driving step and the forward driving step for determining whether the reel pulse signal is input while driving the tape in the high speed in the forward direction. If not, a video tape recorder comprising a reverse high speed driving step of determining whether a reel pulse signal is input while driving the tape in a reverse speed at a high speed in a RPS mode while driving the tape in a reverse direction in a mode that does not play a tape. Treatment method when inserting tape. The method of claim 1, wherein the counting step; A CFG signal counting step of counting the number of CFG signals generated when the supply reel and take up reel are rotated once; A comparison step of comparing the number of CFG signals counted in the CFG signal counting step; When the number of CFG signals counted when the supply reel is rotated once in the comparison step is less than the number of CFG signals counted when the take-up reel is rotated once, FPS when the number of CFG signals counted when the supply reel is rotated once in the reverse high-speed driving step performing the non-regeneration mode and the comparison step is larger than the number of CFG signals counted when the take-up reel rotates once And a reverse high-speed drive step of performing a mode in which the tape is forward-played at a high speed in the mode and does not play the tape.