KR0130428B1 - Automatic input line selection device for vcr - Google Patents

Abstract

The input line automatic selection apparatus of VCR is comprised of a voltage providing part(23) for providing a variable voltage value upon a plug being inserted in the first input line and the second input line; a high frequency(RF) line part(24) for providing the high frequency; a controlling part(21) for providing a switching control signal for selecting the input line corresponding to the variable voltage values provided from the voltage providing part(23); a switching part(22) for selecting and outputting the input line, i.e. the first line, the second line and RF line part corresponding to the switching control signal provided from the controlling part(21).

Description

VRC's input line automatic selector

1 is a block diagram showing the configuration of an input line selection device of a VR in the prior art.

FIG. 2 is a diagram of the control signal for input line selection shown in FIG.

3 is a block diagram showing an automatic input line selection device of a V-C in accordance with the present invention.

4 is a flowchart for performing a method for automatically selecting an input line of VRC according to the present invention.

* Explanation of symbols for main parts of the drawings

10, 20: control command application unit 11, 21: control unit

12, 22: switching unit 13: line

1, 14: line 2, 15, 24: RF line part

23: voltage providing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input line selection device of a video cassette recorder (hereinafter referred to as a VCS), and more particularly, to an automatic input line selection device of a VCA for automatically selecting input lines of a plurality of audio and video signals. It is about.

In the prior art, the audio and video signal input line selection apparatus of V-Cal has an audio and video signal input jack (JACK) or an input terminal, that is, lines 1 and 2 (13, 14) and RF (Radio) as shown in FIG. Frequency (Frequency) When there is an input unit 15, after inserting a plug into an audio or video signal input jack, the user switches the input line selection switch on the control command applying unit 10, the control unit 11 Provides control signals A and B corresponding to the input line selection switch switching as shown in the diagram of FIG. 2 to the switching unit 22 to control the switching switching operation of the switching unit 22.

That is, when the control command applying unit 10 is provided with the line 1 (13) selection switch switching signal, the control unit 10 provides a high level signal to the switching unit 22 for both the control signals A and B, and the line 2 ( 14) The selection switch switching signal is provided, the control signal A provides a low level signal, the control signal B provides a high level signal to the switching unit 22, and the control signal when the RF line 15 selection switch switching signal is provided. A provides a high level signal and a control signal B provides a low level signal to the switching unit 22, and if no input line is selected, both control signals A and B provide a low level signal to the switching unit 22. .

Therefore, the switching unit 12 switches to an input line according to a control signal provided from the control unit 11 and selects and outputs the corresponding input line.

As described above, the conventional VR input line selection device is inconvenient for the user to insert the plug into the video and audio signal input jacks, and then operate the remote control again to select the input line.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide an automatic input line selection device of V-CAL for automatically selecting video and audio signal input lines.

A feature of the present invention for achieving the above object is a VSR input line automatic selection device for automatically selecting an input line in a VRC having a plurality of audio and video signal input jacks, wherein the plurality of inputs are provided. A voltage providing unit providing a variable voltage value depending on whether a plug is inserted into the jack; A controller providing a switching control signal for selecting an input line corresponding to a variable voltage value provided from the voltage providing unit; And a switching unit configured to select an input line corresponding to a switching control signal provided from the controller from among a plurality of input lines connected to the plurality of input jacks.

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

3 is a block diagram showing a configuration of an automatic input line selection device of a V-C according to the present invention. The voltage providing unit 23 provides a variable voltage value when a plug is inserted into an input jack of an input line 1 or an input line 2. ), A high frequency (RF) line unit 24 for providing a high frequency signal, a control unit 21 for providing a switching control signal for selecting an input line corresponding to the variable voltage value provided from the voltage providing unit 23, the control unit And a switching unit 22 that selects and outputs an input line corresponding to the switching control signal provided at 21, that is, a line 1, a line 2, and an RF line unit.

In this case, the voltage providing unit 23 is connected in series between a resistor R1 connected to a supply power supply (Vcc), a connection point between the resistor R1 and the control unit 21 and one input jack of the plurality of input jacks. It consists of a resistor R3 and a resistor R2 connected in series between a connection point between the resistor R1 and the control unit 21 and another input jack of the plurality of input jacks.

FIG. 4 is a flowchart for performing an automatic input line selection method of a VR in accordance with the present invention, which will be described with reference to the block diagram shown in FIG.

If the input line selection is the manual selection mode in step 400, the controller 21 may proceed to step 401 to select an input line corresponding to the input line selection applied to the control command applying unit 20. Control the switching operation.

Meanwhile, if the input line selection is not the manual selection mode in operation 400, the controller 21 may proceed to operation 405 to provide a switching control signal for selecting an input line corresponding to a voltage value provided by the voltage providing unit 23. It is provided to the switching unit 22.

That is, when the user inserts the video / audio signal jack into line 1, the switch of line 1 is turned on so that one side of R2 is grounded to form a closed loop, so that the output of the voltage supply unit 23 has the supply power Vcc of R1. , The voltage divided by R2, that is, the voltage value dropped to the value Vcc × (2/3) is provided to the controller 21, and the controller 21 provides the line 1 switching switching signal to the switching unit 22. 407 and 408, the switching unit 22 is switched to the input line corresponding to the switching switching signal provided from the control unit 21 to output the signal of the input line.

When the user inserts the video / audio signal jack into the line 2, the switch of the line 2 is turned on so that one side of the R3 is grounded to form a closed loop, so that the output of the voltage supply unit 23 is supplied with the supply power source Vcc. When the voltage divided by R1 and R3, that is, Vcc × (1/3) becomes a value (step 409) and is provided to the control unit 21, the control unit 21 provides the line 2 switching switching signal to the switching unit 22. In operation 410, the switching unit 22 switches to an input line corresponding to a switching switching signal provided from the control unit 21 (step 410).

If the user does not insert the video / audio signal jacks into the line 1 and the line 2, the switches are all turned off so that the output of the voltage providing unit 23 is controlled when the Vcc is braked to the control unit 21 (step 405). Provides an RF line switching switching signal to the switching unit 22, and the switching unit 22 switches to an input line corresponding to the switching switching signal provided from the control unit 21 to output a signal of the corresponding input line (see Step 406).

On the other hand, when the user inserts into the video / audio signal jack line 1 and line 2, both the switches of the line 1 and the line 2 are turned on so that one side of the R2 and R3 is grounded to form a closed loop, whereby the voltage providing unit 23 The output becomes a value smaller than Vcc x (1/3) and is input to the control unit 21 (step 409). The control unit 21 enters the manual selection mode as described above, and the switching unit according to the user's control command. (22) to control.

As described above, the VRC input line automatic selection device according to the present invention has an effect of automatically selecting an input line without applying a separate remote control signal.

Claims (2)

In a V-al input line automatic selection device for automatically selecting an input line from a V-al having a plurality of audio and video input jacks, a voltage value which is variable depending on whether a plug is inserted into the plurality of input jacks. Providing a voltage providing unit 23; A control unit 21 for providing a switching control signal for selecting an input line corresponding to the variable voltage value provided from the voltage providing unit 23; And a switching unit (22) for selecting an input line corresponding to a switching control signal provided from the control unit (21) among a plurality of input lines connected to the plurality of input jacks. The voltage supply unit 23 includes a resistor R1 connected in series between a supply power supply and the control unit 21, a connection point between the resistor R1 and the control unit, and a plurality of input jacks. A resistor (R3) connected in series between one input jack and a resistor (R2) connected in series between a connection point between the resistor (R1) and the control unit and another input jack of the plurality of input jacks. And an input line automatic selection device of V-CAL according to whether the plug is inserted.