KR950012640B1 - Same time-display circuit and method of double deck system using slow fuction - Google Patents

Abstract

a key input unit in which a simultaneous slow mode key is included; a first signal processing unit for processing a signal reproduced from a first deck as an image signal; a second signal processing unit for processing a signal reproduced from a second deck as an image signal; a switching unit for in turn switching by frame the signals reproduced from the first and second decks; and a control unit for controlling the first deck or the second deck to perform a slow operation by the select of the simultaneous slow key mode and for generating a control signal, by which during one deck of the first and second decks reproduces an image signal corresponding to one screen, the other deck is in a stop operation state.

Description

Simultaneous display circuit of double deck system using slow function and its method

1 is a circuit diagram according to an embodiment of a simultaneous display circuit of a double deck system using a slow function according to the present invention.

2 is a flowchart for explaining a simultaneous display method of a double deck system using a slow function according to FIG.

3 is an operation timing diagram of a simultaneous display circuit of a double deck system using the slow function according to FIG.

* Explanation of symbols for main parts of the drawings

1: key input means 2: key matrix

10: micom 20,30: first and second deck

40,50: First and second video signal processing section 60: Switching section

70: display unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous display circuit and a method of a double deck system using a slow function in a video recording and reproducing apparatus. The present invention relates to a circuit and a method thereof which can be switched in units to display simultaneously.

In general, in the 4-head video cassette recorder (VCR), when the slow function is controlled at a slower speed than normal playback, the picture movement on the variable screen is slower than normal playback, that is, slow motion (SLOW). It means that the image of MOTION) can be obtained. Slow motion without noise can be achieved by repeatedly performing the operation of stop → normal playback → stop → normal playback.

This noise-defining slow function is possible in a VCR with 4 heads, which is not possible with a conventional double deck VTR with 2 heads.

However, a double deck system with four heads is currently being developed and has a slow function, which is one of various functions using four heads.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit capable of simultaneously displaying the playback signals of each deck by switching the playback signals for each deck in a frame unit while simultaneously performing the slow mode operation on each deck in a double deck system having a slow function. To provide.

Another object of the present invention is to control each deck in the double deck system having a slow function to perform the operation according to the slow mode and to switch the playback signal for each deck by one frame unit to display the playback signal of each deck at the same time To provide a way to do this.

In order to achieve the above object, the present invention provides a double deck system having a first deck and a second deck as a unit, comprising: key input means equipped with a simultaneous slow mode key, and a signal reproduced from the first deck; Switching between the first signal processing means for signal processing, the second signal processing means for video signal processing of the signal reproduced from the second deck, and the signal reproduced from the first or second signal processing means alternately frame by frame. And a switching means for recognizing key data according to the simultaneous slow mode key designation so as to control the first or second deck to perform a slow operation, and the switching means controls the other deck while either deck is playing. Is characterized in that it comprises a control means for outputting a control signal to switch over time division alternately to perform the stop operation.

In addition, the present invention is a double deck system having a unit of the first deck and the second deck, the key input step of inputting the simultaneous slow mode key in the normal playback or search mode, and the first deck and the second deck A slow mode setting step of controlling the stop operation and setting the start flag to 1 to allow the first deck to perform a slow operation, and a slow mode determination step of checking the state of the start flag to determine whether the slow operation is being performed; In the slow mode determination step, if the start flag is 1, playback is performed in units of one frame. When one frame passes, the start flag is ring-set at the time when the stop operation is performed. In the performing of the first deck slow operation and the slow mode determination step, the start flag is not 1 Performing a second deck slow operation to feed back to the slow mode determination step after canceling the slow operation by setting the start flag to 1 at the time when the second deck is played back one frame and the stop operation is performed after one frame has passed; It is characterized by.

Hereinafter, exemplary embodiments of a simultaneous display circuit and a method of a double deck system using a slow function according to the present invention will be described with reference to the accompanying drawings.

1 is a circuit diagram according to an embodiment of a simultaneous display circuit of a double deck system using a slow function according to the present invention.

According to FIG. 1, in the key matrix 2, when a simultaneous slow mode designation key is set by a key input means 1 such as a remote control transmitter or a key mounted on a set, the key is recognized by the microcomputer 10. The key data is transmitted to the microcomputer 10 so as to be able to do so.

The microcomputer 10 recognizes the key data for the simultaneous slow mode recognition key and outputs a signal for controlling the speed and direction of the servo unit (not shown) of the first deck 20 and the second deck 30. Recognizing the current operating mode as the position data of the servo unit, the control signal is output again so that the decks 20 and 30 perform the slow mode in the normal playback mode or the search mode.

The first video signal processor 40 performs image signal processing on the reproduction signal output from the first deck 20.

The second video signal processor 50 processes the video signal output from the second deck 30.

The switching unit 60 is composed of a TEA6414 or a control switching switch. The switching unit 60 outputs the output signal of the first video signal processing unit 40 or the second video signal processing unit 50 according to the control signal output from the microcomputer 10. The unit is switched to display the display unit 70.

Here, the TEA6414 is controlled as serial data output from the microcomputer 10 to perform a switching operation by an arbitrary output port control, and the control switching switch is controlled by the logic signal of a specific level output from the microcomputer 10. The output signals of the first and second video signal processing units 40 and 50 are switched in units of frames.

FIG. 2 is a flowchart for explaining a simultaneous display method of a double deck system using the slow function shown in FIG.

2, steps S1 through S3 correspond to key input steps, steps S4 through S5 correspond to slow mode setting steps, steps S6 correspond to slow mode determination steps, and steps S7 through S10 correspond to the first deck. It corresponds to the slow operation performing step, S11 to S14 corresponds to the second deck slow operation performing step.

Next, the flowchart of FIG. 2 will be described by combining the circuit diagram of FIG. 1 and the waveform diagram of FIG.

It is determined whether the copper plate mounted on the key input means 1 has been introduced, and if the simultaneous slow mode key is present, the operation state of the first deck 20 and the second deck 30 is in the PLAYBACK mode (also referred to as PB) mode or It is judged whether it is search mode that plays back at high speed by varying the speed, and when the simultaneous slow mode key is not input or is not in the play or search mode, the currently operating mode, for example, REW (REWind) or FF (Fast). Forward) (steps S1 to S3).

When the simultaneous slow mode key is set in the step S2 and the playback or search mode is performed, the first deck 20 and the second deck 30 are controlled to perform the stop operation at the same time, and the first deck 20 is the slow operation (here The start flag is set to 1 so as to reproduce (steps S4 to S5).

It is determined whether the start flag indicating the slow motion of the first deck 20 is 1 (step S6).

If the start flag is 1 in step S6, the control signal is output to the switching unit 60 to switch the output signal of the first video signal processing unit 40 to process the video signal of the playback signal of the first deck 20. 70). At this time, the second deck 30 is in a stopped state.

At the time when the first deck 20 ends the slow operation, i.e., the stop mode is set, the start flag is set to 0 and fed back to step S6 to determine the state of the start flag (steps S6 to S10).

If the start flag is 0, the control signal is output to the switching unit 60 to switch the output signal of the second video signal processing unit 40 which processes the playback signal of the second deck 30 to the image signal, and then display it on the display unit 70. do. At this time, the first deck 20 is in a stopped state.

At the time when the second deck 30 ends the slow operation, that is, the stop mode is set, the start flag is set to 1 and feedback is performed at step S6 to determine the state of the start flag (steps S11 to S14).

Accordingly, as shown in FIG. 3, the first and second decks 20 and 30 simultaneously perform the stop operation in the regeneration or search mode, and then the first deck 20 performs the first frame slow operation. The playback signal of the deck 20 is displayed on the display unit 70, and the second deck 30 is stopped.

At the end of the slow operation of the first deck 20, that is, at the stop mode, the playback signal of the second deck 30 is switched and displayed on the display unit 70, and the first deck 20 is in a stopped state. .

By alternately repeating the above-described operation, the slow screen of the first deck 20 or the second deck 30 may be time-divided and simultaneously viewed.

As described above, the simultaneous display circuit and method of the double deck system using the slow function according to the present invention simultaneously perform the first deck and the second deck in the slow mode, and any deck of each deck reproduces one frame. During the slow operation, the other deck can display the playback signal of each deck simultaneously by time-dividing the display by switching the stop motion alternately by one frame unit.

Claims (3)

A double deck system having a first deck and a second deck as a unit, comprising: key input means equipped with a simultaneous slow mode key, first signal processing means for processing a video signal from a signal reproduced from the first deck, Second signal processing means for processing video signals reproduced from the second deck, switching means for alternately switching signals reproduced from the first or second signal processing means frame by frame, and the simultaneous slow mode key Recognizing key data according to a designation, the first or second deck is controlled to perform a slow motion, while the switching means stops the other deck while one of the decks reproduces a video signal for one screen. Double deck system using a slow function, characterized in that it comprises a control means for outputting a control signal to switch by time-division alternately to perform Simultaneous display circuit. The slow function according to claim 1, wherein the switching means comprises a control switching switch for switching the output signal of the first or second signal processing means in units of one frame according to the control signal output from the microcomputer. Simultaneous display circuit of double deck system. In a double deck system having a first deck and a second unit, a key input step of inputting a simultaneous slow mode key during normal playback or search mode, and controlling the first deck and the second deck to stop operation. In the slow mode setting step of setting the start flag to 1 to slow the first deck, and the slow mode determination step of checking the state of the start flag to determine whether the slow operation is being performed, and in the slow mode determination step If the start flag is set to 1, playback is performed in units of frames, and when one frame passes, the start flag is set to 0 to cancel the slow operation and then the first deck slow operation is fed back to the slow mode determination step. And if the start flag is not 1 in the slow motion determination step, the second deck plays one frame. And a second deck slow mode performing step of feeding back to the slow mode determination step after canceling the slow operation by setting the start flag to 1 at the time when the stop operation is performed after one frame has passed. Simultaneous display of the double deck system used.