KR900000760B1 - The out put automatic switching system of double deck video tape recorder - Google Patents

Abstract

The system having VHS video deck and 8mm-video deck selects the deck according to the driving mode of the decks and transmits the output signal of the selected deck through a RF converter. The system incldues a control IC (45) for generating "HIGH" or "LOW" leveled output control signal (CTL) according to the driving mode of the decks, and a switch (SW5) for switching the output of the decks according to he output control signal and for transmitting the switched signal to the RF converter.

Description

Automatic switching system of double deck video tape recorder

1 is a schematic configuration diagram of a conventional video tape recorder.

2 is a schematic diagram of a double deck VIR including a conventional signal processing system.

3 is a schematic diagram of a double deck VTR including an automatic output switching system according to the present invention.

FIG. 4 is a detailed circuit diagram of the integrated circuit for output control in FIG.

* Explanation of symbols for main parts of the drawings

10: antenna 20: TV receiver

30: video tape recorder 31, 41: tuner unit

32: video deck 33, 44: RF converter

40: double deck video tape recorder 42: 8mm deck

43 VHS deck portion 45: integrated circuit for output control

The present invention relates to a signal processing system of a double-deck video tape recorder (hereinafter referred to as VTR). In particular, each deck in a double-deck VTR in which a VHS video deck and an 8mm video deck are integrated into one VTR. The present invention relates to an automatic switching system of a double-deck VTR, which automatically selects a deck according to the operating state of the system and enables the output of the selected deck to be output through the RF converter.

Generally, only VHS standard (12.65mm) video tape can be used in VHS VTR, and only 8mm video tape can be used in VTR of 8mm. Therefore, if the person who owns the VHS-type VTR has an 8mm video tape, it cannot be used, and if it is inevitable to use it, it is inconvenient to purchase an 8mm-type VTR separately. In addition, two VTRs were required to copy and edit the program usage of the VHS tape to 8 mm tape, or vice versa.

Accordingly, there is a growing demand for multifunctional VTRs that can use any one of VHS or 8mm tapes and perform copying and editing functions by itself using one VTR. In order to meet such a demand, the research and development of the double deck VTR which integrates two video decks, especially two video decks of different system into one VTR in recent years is progressing.

Such a double deck VTR is a VHS-8mm integrated double deck VTR, for example, to simultaneously perform a recording function on a VHS video deck (hereinafter referred to as VHS deck) and an 8mm deck (hereinafter referred to as 8mm). One deck of VHS decks or 8mm decks can record programs on a particular channel being broadcast, while the other can play back video decks, and copy and edit the program content of VHS tapes to 8mm tapes. Conversely, you can copy and edit the program content of an 8mm tape to a VHS tape.

The signal processing system of the double-deck VTR that can realize the simultaneous recording and playback functions of the VHS-8mm integrated double-deck VTR has already been patented in Korea by the applicant of the present application. We want to provide an additional feature that allows for automatic switching of outputs.

Accordingly, an object of the present invention is to select the deck automatically according to the operating state of each deck in the VHS-8mm integrated double deck VTR, so that the output of the selected deck can be output through the RF converter VTR-8TR It is to provide an automatic switching system of the output.

A conventional general VTR has a VHF band (54-216 MHz up to 2 to 13 channels) or a UHF band (470-up to 14 to 83 channels) received through the antenna 10, as shown in FIG. A tuner unit 31 for converting a 890 MHz RF signal into a video signal of about 4 MHz, a video deck unit 32 on which a video deck is mounted, and an image signal output from the video deck unit 32. The RF converter 33 is converted into an RF signal.

In order to configure the double deck VTR using the conventional VTR having such a configuration, a tuner part and an RF converter will be required for each deck, but as shown in FIG. 2, the input selection switch SW1 and the output selection are shown. By using the switch SW2, the input switching switches SW3, SW4, and the output switching switch SW5, a single deck unit VTR can be configured with only one tuner unit 41 and one RF converter 44. have.

2 is a schematic configuration diagram of a signal processing system of a VHS-8mm integrated VTR, which has already been patented in Korea by the present applicant (Patent Application No. 86-5205).

In FIG. 2, the input selector switch SW1 indicates whether the signal input to the 8mm deck 42 or the VHS deck 43 is the output signal from the tuner section 41 or the output signal from the other deck, that is, the 8mm deck. Reference numeral 42 denotes a switch for selecting whether the signal is output from the VHS deck 43 and the VHS deck 43 is a signal output from the 8 mm deck 42. The output selection switch SW2 is applied to the converter 44. It is a position to select whether the signal to be output is the signal output from the 8mm deck 42 or the signal output from the VHS deck 43. In addition, the input switching switches SW3 and SW4 are two-channel analog switches which perform the switching operation according to the on and off states of the input selection switch SW1, respectively, and the output switching switch SW5 is the output selection switch SW2. It is a 2 channel analog switch which performs the switching operation according to the on / off state of).

The operation of the conventional signal processing system having the above configuration will be described.

When the input and output selection switches SW1 and SW2 are both on, the voltage VDD flows to the ground terminal through the respective resistors and the switches SW1 and SW2, so that the points A and B ), The potentials are all low, and a low signal is applied to the control terminals CTL of the input and output switching switches SW3, SW4 and SW5. When the low signal is applied to the control terminal CTL, the analog switch SW3-SW5 is connected to the contact X0-C, and the contact X1-C is connected when the high signal is applied.

Therefore, since the contacts X0-C of the switches SW3 and SW5 are connected, the VHS deck portion 43 performs a regeneration operation, and its output is connected to the contacts X0-C and the RF converter 44 of the switch SW5. Since the TV receiver 20 is applied to the TV receiver 20, the output of the VHS deck unit 43 may be viewed through the TV receiver 20. At the same time, since it is applied to the 8mm deck portion 42 via the contact X0-C of the switch SW3, the 8mm deck portion 42 records the VHS deck portion 43 output.

As described above, as the switches SW1 and SW2 are turned on and off, the output of the tuner 41 or the output of each deck is applied to the other deck to be recorded, and the output of each deck is passed through the RF converter. It is applied to the receiver to be able to watch.

The present invention relates to a signal processing system for automatically selecting an output of a double deck VTR in accordance with an operation state of each deck by using an output control integrated circuit instead of an output selection analog switch SW2.

3 is a schematic configuration diagram of the automatic output switching system of the VHS-8mm integrated double deck VTR according to the present invention, in which the output selection switch SW2 is removed in the configuration of FIG. 2, and the output control integrated circuit 45 is replaced. Installed.

That is, the output automatic switching system according to the present invention, the tuner unit 41 for converting the RF signal received through the antenna 10 into an image signal, the 8mm deck unit 42 and VHS tape on which 8mm tape is mounted Of the VHS deck unit 43 and the 8 mm deck unit 42 and the VHS deck unit 43 to select a signal input to each of the input selection switch SW1 and the input selection switch SW1. Input converter switches (SW3) and (SW4) for performing the switching operation according to the operating state, and the RF converter converts the video signal output from the 8mm deck section 42 or VHS deck section 43 to an RF signal An output control integrated to generate a control signal for determining whether to connect the output of the deck (44) or the output of the 8 mm deck section (42) or the VHS deck section (43) to the RF converter (44). An output for performing a switching operation in accordance with a circuit 45 and a control signal from the output control integrated circuit 45 It consists of a ring switch (SW5).

The integrated circuit will be described first before describing an operation of automatically processing the output of the deck unit by outputting a control signal from the output control integrated circuit 45 according to the operation state of each deck.

In order to effectively switch the output of each deck, it examines all the states in which each deck can operate, and which deck output is selected and connected to the RF converter according to the operation state of each deck, and also controls each deck. The changes in the signals are as follows.

TABLE 1

Here, X denotes a case in which the operation state of each deck is a state other than PLAY or REC, that is, a state of STOP, high speed driving (FF), rewinding (REW), and ejection (EJECT). Indicates. Is a case where each signal is in the high state, that is, when the PLAY button, the REC button, or the input selection switch SW1 is on. '0' indicates that each signal is in a low state, that is, when the PLAY button, REC button, or input selection switch SW1 is off. 'D' represents a case where a don't care condition does not matter even if each signal becomes '1' or '0'. On the other hand, when both decks are in the same operating state at the same time, the VHS deck is given priority, because the VHS method has a higher market share than the 8mm method.

Referring to Table 1, except for the following four cases, all of the control signals CTL, which are signals output from the integrated circuit 45, are connected such that the output of the VHS deck 43 is connected to the RF converter 44. It is an integrated circuit. 1) Only 8mm deck performs playback, 2) Only 8mm deck performs recording, 3) VHS deck performs playback, 8mm deck performs recording, i.e., VHS deck 4) 8mm deck performs the playback operation, VHS deck performs the recording operation of the television broadcast, that is, the output control integrated circuit 45 of the present invention In the above four cases, the 8mm deck is selected so that the output of the 8mm deck unit 42 is applied to the RF converter 44. If the control signal is '1', that is, the 'high' state, the 8mm deck ( 42) is selected, and when the control state (CTL) of the output control integrated circuit 45 is defined so that the VHS deck is selected in the state of '0', i.

Since the control signal CTL, which is an output signal of the output control integrated circuit 45, is in a high-high state only in the above four cases, in this case, the input terminal of the output control integrated circuit 45 controls the state as shown in Table 1 below. Is applied to the signal AE. That is, in the case of 1) where the control signal CTL becomes # 1, the state of the input signal A-E is 1000d, in the case of 2) 0100d, in case of 3) 01100, and in case of 4) 10011.

therefore,

In this case, A is a case in which the 8 mm deck 42 performs a playback operation, and B is a case in which the 8 mm deck 42 performs a recording operation. C is a case where the VHS deck 43 performs a reproducing operation, D is a case where the VHS deck 43 performs a recording operation, and E represents an input selection.

이다. 왜냐하면, A와 B가 동시에 ＂하이＂상태가 되는 경우는 없기 때문이다. 즉, 하나의 데크에서 재생기능과 녹화기능을 동시에 수행할 수는 없기 때문이다. 마찬가지로,

,

,

로 된다.In the formula (1-1),

to be. This is because A and B cannot be in a high state at the same time. That is, it is not possible to simultaneously play and record on one deck. Likewise,

,

,

It becomes

Therefore, Formula (1-1) becomes as follows.

Therefore, when the output signal CTL of the output control integrated circuit 45 is connected to the control input terminal CTL of the output switching switch SW5, the output of the deck is automatically switched.

4 is a logic gate representing a Boolean expression for the control signal CTL.

Therefore, an output signal of the output control integrated circuit 45 having the configuration as shown in FIG. 4 is applied to the control input terminal CTL of the output switching switch SW5, so that the output selection operation according to the operation state of each deck part is performed. When described, it is as follows.

First, the VHS deck unit 43 performs a regeneration operation and its output is applied to the TV receiver 20 via the RF converter 44, and at the same time, the 8 mm deck unit 42 of the VHS deck unit 43 The operation of recording the output will be described.

Since the input selection switch SW1 is in an off state, a high state signal is applied to the output control input terminal E, and the VHS deck unit 43 performs a regeneration operation. Therefore, a high state signal is applied to the input terminal C. The low state signal is applied to D. In addition, since the 8 mm deck unit 42 performs the recording operation, a high state signal is applied to the input terminal B, and a low state signal is applied to A.

Therefore, when the output control integrated circuit 45 is substituted for the Boolean expression (1-2), the output signal CTL goes low and is applied to the input control terminal CTL of the output switching switch SW5. The contacts X0-C of the switch SW5 are connected so that the output of the VHS deck portion 43 is applied to the RF converter 44.

Next, when the output of the tuner unit 41 is recorded by the 8 mm deck unit 42 and the output is output to the RF converter 44, since the 8 mm deck unit 42 performs the recording operation, the input signal (B) is high, and therefore A is low. In addition, since the VHS deck unit 43 does not perform any operation, the input signals C and D are all low, and the input signal E is low because the input selection switch SW1 is on. . Therefore, when the input state is substituted into the Boolean expression (1-2), the output signal CTL becomes high and is applied to the output switching input control terminal CTL, so that the contact point X1- of the switch SW5 is applied. C) is connected so that the output of the 8mm deck portion 42 is applied to the RF converter 44.

As described above, the signal of the high state is output from the output control integrated circuit 45 only in the above four cases so that the output of the 8 mm deck section 42 is applied to the RF converter 44. A low state signal is output so that the output of the VHS deck portion 43 is applied to the RF converter 44.

According to the present invention as described above, the automatic output switching system of the double-deck VTR realizes a function that can automatically switch the output according to the operating state of each deck in the double deck itself, even if the output selection switch is not operated artificially. Since the two VTRs are integrated into the double-deck VTR, the number of switches can be reduced, and it is convenient for the user.

Claims (1)

A tuner unit 41 for converting the RF signal received through the antenna 10 into a video signal, an 8mm deck unit 42 on which 8mm tape is mounted, a VHS deck unit 43 on which VHS tape is mounted, An input selector switch SW1 for selecting signals input to the 8mm deck unit 42 and the VHS deck unit 43, and an input switching switch for performing a switching operation according to an operating state of the switch SW1; 8mm-VHS integrated double deck video system comprising SW3, SW4 and an RF converter 44 for converting the video signal output from the 8mm deck section 42 or the VHS deck section 43 into an RF signal. And an output control integrated circuit 45 for generating an output control signal CTL in a high or low state depending on the operating state of the 8 mm deck portion 42 or the VHS deck portion 43; According to the output control signal CTL of the control integrated circuit 45, the output of the 8mm deck portion 42 or the VHS deck portion 43 is measured. The ever switched to the RF konbeo eoteo double deck output automatic switching system of the video tape recorder comprising the output change-over switch (SW5) for outputting to 44.

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