KR930001363Y1 - Copy timing setting circuit for double deck vcr - Google Patents

Abstract

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Description

Copy timing setting circuit of double deck VCR

1 is a circuit diagram of the present invention.

2 is a mode switch input state diagram according to the deck driving state.

3 to 6 are waveform diagrams for explaining the present invention.

* Explanation of symbols for main parts of the drawings

5, 10: motor driving circuit 15: microprocessor

The present invention is a double-deck VCR (Video Cassette Recorder) with two decks and a copy function of COPY, which is a tape copying function. A copy timing setting circuit of a double deck VCR to be controlled.

When copying a VCR tape (tape copy), two VCRs or a double-deck VCR with copy function is used.The copy method uses one deck as the playback mode and the other deck as the recording mode. The video signal generated by being reproduced in the deck was recorded in the other deck. However, in the above method, it is difficult to exactly copy the desired contents to the desired part because the playback time and the recording time of the tape do not exactly match. By converting the deck into a pause mode by activating the deck and then releasing the pause mode of both decks, the play signal and the recorded signal can be matched to some extent, but this is not a fundamental solution.

Especially in double deck VCR with two decks and built-in copy function, if copy key is pressed after copy key is pressed, one deck can be played back and the other deck is recorded. The operation time of one deck to switch to playback operation by recognizing copykey input was different from the operation time of the other deck to switch to recording operation.

In other words, if the operation time of one deck to play back is fast, some of the playback signals that are initially played cannot be recorded. If the operation time of the other deck to start recording is too fast, no signal is recorded at the beginning of recording. On the other hand, the screen state during the copy operation was not natural because the desired part of the copy could not be exactly matched.

As such, when copying from a double-deck VCR, a waste of tape occurs and a problem cannot be accurately copied at a desired part. Therefore, in the present design, the operation status of the other deck is controlled by checking one deck and a mode switch input. I could do it.

That is, the present invention controls the timing of one deck during the copy operation of the double deck VCR by the signal generated from the deck status discrimination switch (mode switch) of the other deck or the timing signal generated by the sensor secondarily. It is to solve the above conventional drawbacks.

This invention is described in detail based on the accompanying drawings as follows.

1 is a circuit diagram of the present invention, a first input means for inputting a mode switch signal of a Hank deck (deck 1), a second input means for inputting a mode switch signal of the other deck (deck 2), and a copy key input. And a third control means for determining a signal state input through the signal input means, and outputting a servo control signal of decks 1 and 2, and a servo control signal output of the central control device. And deck motor control means for controlling the motor drive of deck 1 and deck 2.

At this time, the central control unit is composed of a microprocessor (15) to check the mode switch input and copy key input to the motor drive circuit (5) (10) to control the driving of the other deck when one deck proceeds to the set operation mode The servo control signal is output, and the driving of the motor driving circuit 5 and 10 is controlled by the servo control signal of the microprocessor 15.

The mode switch signal is a signal generated by a mode switch mounted in a VCR deck or a signal generated by a mode switch sensor and generated secondly. All VCR decks have three mode switches (hereinafter referred to as mode switch A, mode switch B, Mode switch C is called).

Here, the mode switch is selected according to the operation state of the deck to generate the mode switch signal as shown in (A) of FIG. 2 and the operation mode of the deck according to the input of the mode switch signal is shown in FIG. As shown in

In case of extract mode, mode switch A, B is in 'L' state, mode switch C is in 'H' state, and in case of fast forward (FF, REW) mode, mode switch A is in 'H' state, and mode switch B and C are in the 'L' state and in the stop mode, the mode switches A and C are in the 'L' state, and the mode switch B is in the 'H' state and the reverse picture search (RPS, JET RPS) mode is In case of mode switch B, C is in 'H' state, mode switch A is in 'L' state, and in case of REC PAUSE mode, mode switch A, B is in 'H' state, and mode switch C is in 'L' state. Mode, the remaining recording (REC), playback (PLAY), still image (STILL), and forward picture search (FPS) mode, the mode switches A and C are in the 'H' state, and the mode switch B is in the 'L' state. do.

In this way, the mode switch signal levels applied to the mode switches A, B, and C are different according to the operation mode of the tex, and the microprocessor 15 receives the mode switches A, B, and C inputs of deck 1 and deck 2 to operate each deck. You will know the mode.

First, we look at the operation of the deck from the extraction mode to the recording or playback mode (both deck 1 and deck 2 are the same). Or recording mode, but in this case, extract mode (ⓛ) → send mode (②) → stop mode (③) → reverse picture search mode (④) → record pause mode (⑤) → play and record mode (⑥) In order, the signal levels of the mode switches A, B, and C apply different signal levels to the microprocessor 15 according to each mode, as shown in FIG.

In order to be an extraction mode in the playback and recording modes, the signal levels of the mode switches A, B, and C are changed in the order of ⑥ → ⑤ → ④ → ③ → ② → ① in the reverse order.

In other words, the signal levels of the mode switches A, B, and C are changed in the order of ① → ② → ③ to become the stop mode in the extraction mode, and in the order of ③ → ② → ① to become the extraction mode in the stop mode. The signal levels of the mode switches A, B, and C are changed in the order of the mode switches A, B, and C.

In this way, the microprocessor 15 receives different signal levels from the mode switches A, B, and C according to the operation status of the deck, so that the operation status of the deck can be accurately understood. When the signal level of the mode switches A, B, and C is input to the desired operating mode, the servo motor control signal for operating the other text to the desired mode can be output. In other words, in the present design, when the deck key is input to copy a signal reproduced from one deck of a double-deck VCR to the other deck, the other deck is checked when one deck is determined to have a preset mode state by checking the mode switch signals of both decks. By operating in the desired mode, the setting mode of one deck and the setting mode of the other deck and the operation mode of the other deck are set in advance by checking the operation time of each deck.

When the copy key is input in the double deck VCR, the servo motor control signal receives the mode switch signal input of one deck from the microprocessor 15 and operates the other deck in the desired mode when the signal input of the preset mode is input. In the present invention for outputting the set mode state and its operation state for each deck can be set in five cases as follows.

First, when one deck is stationary, the other deck is recorded.

Second, when one deck is in play, the other deck is recorded.

Third, when one deck is in REC PAUSE, the other deck is recorded.

Fourth, when one deck passes the reverse picture search (RPS) or recording pause moment, the other deck is recorded.

Fifth, after one deck is paused for recording, the other deck becomes a play or stop mode, and the other deck is played while the other deck is recorded.

As described above, each of the five cases will be described based on the accompanying drawings.

First, the first case will be described with reference to FIG.

The deck's mode switches A, B, and C are shown in Figure 2 when the deck is operating, from the tapeless (extraction mode) to the recording or playback mode, as shown in Figure 2. ⓛ → ② → ③ → ④ → ⑤ → In order of ⑥, the mode switch signal level is applied to the microprocessor 15, and the microprocessor l5 checks the mode switch signal of the copy key input deck 1 (the deck to be reproduced during copy operation) and stops it (mode switch). When A and C are in the 'L' state and the mode switch B is in the 'H' state, the servo motor control signal for operating the servo motor control signal for operating the deck 2 (the deck to record during copy operation) in the recording state thereafter. Will be printed as

Thus, deck 2 can be recorded when deck 1 is at rest.

In other words, when deck 1 is in the stopped state before playing, the deck 2 can be recorded. In this case, before the tape of deck 1 is played, the recording operation is started. You can record from.

The second case is almost the same as the first case as shown in FIG. 4 except that deck 1 is in the playing state (mode switches A and C in the 'H' state and mode switch B in the 'L' state). Only recording 2 is wrong.

In this case, since the recording operation of deck 2 is performed at almost the same time as the tex 1 and tape playback, it can be used to copy at exactly the desired part when the operation time of each deck is almost the same.

The third and fourth cases are almost the same as the first and second cases described above as shown in FIG. 5 except that deck 2 is recorded when the deck 1 is in the reverse picture search or recording pause state.

That is, the deck 2 recording signal for recording deck 2 when the deck 1 is in reverse picture search state (mode switch A is 'L' state, mode switches B and C are 'H' state) is shown in FIG. Deck 2 recording signal to output deck 2 when deck 2 is in recording pause state (mode switch) A, B is 'H' state and mode switch C is 'L' state. Will be output as shown in (b) of FIG.

In this case, the recording operation is started before the tape is played. Therefore, when the operation time of the deck 1 is earlier than the operation time of the deck 2, the playback signal of the deck 1 can be accurately recorded in the desired portion of the deck 2.

The fifth case is almost the same as the case described above, as shown in FIG. 6. However, if the operation time of the deck 1 and the deck 2 is the same, it is possible to record exactly from the point of tape playback.

In other words, when deck 1 is in the playing state (mode switch A, C is in the 'H' state, and mode switch B is in the 'L' state), deck 2 is operated in the recording state, so as shown in the lower part of FIG. The signal and the playback signal of deck 2 can be output at the same time.

Therefore, the recording operation of the deck 2 is performed at the same time as the playback operation of the deck 1, the copy operation of the ideal form is achieved when the operating time of the deck is the same.

In this way, in the copy operation of the double-deck VCR, by checking the mode switch input of one deck and driving the other deck when the desired mode switch input is applied, unnecessary waste of tape can be eliminated and the desired part can be corrected. Copying is possible.

That is, the present invention checks the operation state of one deck of the double deck cassette and controls the driving of the other deck in synchronization with the operation when the desired operation state is reached.

Claims (1)

In the copy operation of a double deck VCR, a mode switch input means for mode switch input of deck 1 and a mode switch input of deck 2, a copy key input means for copy key input, and a mode switch applied through the input means And a microprocessor 15 for checking the copy key input and outputting a servo control signal for recording and operating the other deck when a mode set in one deck is input, and by the servo control signal of the microprocessor 15. A copy timing setting circuit of a double deck VCR composed of a motor driving circuit (5) (10) for controlling the driving of decks 1 and 2.