KR0119787Y1 - Signal switching device of lap-top vcr - Google Patents

Abstract

The present invention relates to a signal switching device of the laptop V- seed, conventionally had to be plugged into the external audio and video jack, and to switch to the audio and video mode only to switch to the audio and video mode with the slide switch there was an inconvenience.

The present invention detects the presence / absence of a plug into an external audio and video jack and outputs a control signal according to the conventional inconvenience, and the TV video through an external audio signal and a video signal or an antenna according to the control output. Signals and audio signals are selected to be recorded through the video and audio processing units, respectively.

Therefore, the present invention is always in the TV mode, the external audio and video jacks are plugged into the audio and video mode automatically has the advantage of providing the user's convenience.

Description

Laptop V Signal Switching Device

1 is a block diagram of a signal switching device of a conventional laptop V-C.

Figure 2 is a block diagram of a signal switching device of the laptop VRL of the present invention.

3 is a detail of FIG.

* Explanation of symbols for main parts of the drawings

6: slide switch 30: control unit

40: selection

The present invention relates to a mode switching technology in a laptop V-Cal. In particular, the laptop V is a TV mode that is normally in the TV mode and the TV mode is automatically switched to an external signal mode when a plug is inserted into an audio and video jack. It relates to a signal switching device of the seed.

VLC is usually used in connection with a separate TV, but recently, it is used to perform a monitor function by using liquid crystal (LCD) among TV integrated TVs, and moreover, it is similar to the shape of a notebook PC for portable use. A foldable TV monitor integrated VLC that consists of a liquid crystal (LCD) with a folding type is called a laptop V seed.

The signal switching device of the conventional laptop V-C is a tuner (2) for tuning the TV broadcast received from the antenna (1), as shown in Figure 1, the TV tuned by the intermediate frequency tuned signal from the tuner (2) An intermediate frequency (3) for outputting audio and video signals (TAS) and (TVS), respectively, and a television audio and video signal (TAS), (TVS) or an external video and audio jack (4) of the intermediate frequency (3). External video and audio signals (EVS) and (EAS) from (5) are input to input terminals (C1, C2) and (a1, a2), respectively, through output terminals (b1, b2) according to mode selection. A slide switch 6 for switching the selected signal to be output, an attenuator 21 for attenuating the audio signal through the output terminal b1 by switching the slide switch 6, and a reduction through the attenuator 21. An automatic level controller 22 for varying the audio signal and controlling the audio signal to a predetermined level, and the audio of the automatic level controller 22; A recording amplifier 23 for amplifying a false signal to a predetermined level, an adder 24 for synthesizing an audio signal amplified by the recording amplifier 23 and a recording bias by the variable resistor VR1, and the adder ( An audio processing unit 20 including a composite audio head 25 for recording the audio signal output from 24 into a tape, and a composite video signal through its output terminal b2 by switching the slide switch 6; Is separated into luminance and chroma signals YS and CS, and the automatic gain control unit 11 for gain control of the luminance signal YS to a predetermined level and the luminance signal of the automatic gain control unit 11 are filtered. A low pass filter 12, an FM modulator 13 for f-modulating the luminance signal filtered by the low pass filter 12, and a high pass for filtering an FM modulated signal from the FM modulator 13; A filter unit 14 and a low-pass converter for converting the separated chroma signal CS Inverse conversion unit 16, a low pass filter unit 17 for filtering the low-frequency conversion chromaticity signal from the low pass conversion unit 16, and the luminance output from the high pass filter unit 14 and the low pass filter unit 17 An adder 15 for synthesizing the signal and the chromaticity signal and outputting the composite video signal, and a recording amplifier for amplifying the composite video signal output from the adder 15 to a predetermined level and recording the same through the rotating video head 19. And a video processing unit 10 composed of 18).

The signal switching device of the conventional laptop VCA configured as described above is a TV broadcast received through an external antenna (1) through a tuner (2) and an intermediate frequency unit (3) to a TV audio and video signal (TAS), (TVS). Generated and input to the input terminals C1 and C2 of the slide switch 6, respectively, while the external video and audio signals EVS, which are input through the external video jack 4 and the external audio jack 5, ( EAS) is input to the input terminals a2 and a1 of the slide switch 6, respectively.

Accordingly, in order to watch TV broadcasting according to a user's selection, the slide switch 6 is switched to the TV mode, and the TV audio and video signals TAS and TVS inputted to the input terminals C1 and C2 are changed. Output through the output terminals (b1), (b2), the TV audio signal (TAS) is attenuated through the attenuator 21 and the automatic level control unit 22 is controlled to a certain level and the recording amplifier 23 After being amplified to a predetermined level at < RTI ID = 0.0 > a < / RTI >

In addition, when the TV video signal TVS is divided into luminance and chroma signals YS and CS, the luminance signal YS is gain controlled and filtered through the automatic gain control unit 11 and the low pass filter unit 12. The FM modulation unit 13 and the high-pass filter unit 14 are FM-modulated and filtered and input to the adder 15, while the separated chroma signal CS is converted into the low-pass converter 16 and the low-pass filter unit ( 17, the low-frequency conversion and filtering is input to the adder 15, so that the composite video signal synthesized by the adder 15 is amplified to a predetermined level through the recording amplifier 18 and then attached to the rotating drum. Recorded via videohead 19.

On the other hand, when the slide switch 6 is switched to the external signal mode, the external audio and video signals EAS and EVS are input to the input terminals a1 and a2, and the output terminals b1 and b2. ) Are input to the audio processor 20 and the video processor 10 in the same manner as described above and processed.

However, since the signal switching device of the conventional laptop VRA is manually switched between the TV mode and the external signal mode by the slide switch, the slide switch must be operated every time the mode is to be switched. There was a problem that this was very uncomfortable.

The present invention was conceived in view of the above-described conventional problems, and the signal switching device of the laptop V-AL which is normally in a TV mode and automatically switches to an external signal mode when a plug is inserted into an external audio and video jack. It aims to provide.

The signal switching device of the present invention laptop VRT according to the above object is a control unit for detecting whether the plug is inserted into the external video and audio jacks by the potential difference, and outputs a selection signal according to the selection signal output of the control unit; And a selector for switching and outputting the TV audio and video signals or the external audio and video signals.

Referring to FIG. 3 which is a detailed view of FIG. 2 and FIG. 2 showing one specific embodiment of the present invention configured as described above, the operation and effects of the present invention will be described in detail as follows.

First, in the normal video mode, in which the plug is not inserted into the external video and audio jacks 4 and 5, it is in a TV mode. In this case, the detection terminals b1 of the external video and audio jacks 4 and 5, Since (b2) is not grounded, high potential signals are respectively input to the noble gate NOR1 and the OR gate OR1 of the controller 30, and the outputs of the noble gate NOR1 and the OR gate OR1 are respectively low potential and High potential

The low potential and high potential output signals of the NOA gate NOR1 and the OR gate OR1 are applied to the gates of the MOS field effect transistors F3, F4 and F1, F2 of the selector 40. The MOS field effect transistors F3 and F4 are turned off, and the MOS field effect transistors F1 and F2 are turned on so that the TV broadcast received from the external antenna 1 is tuned to the tuner 2 and the intermediate frequency 3. After tuning through the intermediate frequency, it is output as a TV audio and video signal (TAS), (TVS), the TV and video signal (TAS), (TVS) is the MOS field effect transistor (F1) (F2) After each through the buffer unit 52, 51 is input to the audio processing unit 20 and the video processing unit 10 through each of the same process as shown in FIG.

In addition, even if a plug is inserted into any one of the external video jack (4) and the external audio jack (5) operates in the TV mode as described above.

On the other hand, when the plug is inserted into both the external video jack 4 and the external audio jack 5, the mode that was normally in the TV mode is automatically switched to the external signal mode, that is, the external video jack 4 and the external When the plug is inserted into the audio jack 5, the sensing terminals b1 and b2 of the external video jack 4 and the external audio jack 5 are grounded, so that the noar gate NOR1 and the oragate of the controller 30 are grounded. The low potential signal is input to OR1, respectively, and the outputs of the noar gate NOR1 and the OR gate OR1 become high potential and low potential.

Accordingly, the high potential and low potential output signals of the NOA gate NOR1 and the OR gate OR1 are applied to the gates of the MOS field effect transistors F3, F4 and F1, F2 of the selector 40, respectively. The MOS field effect transistors F3 and F4 are turned on, the MOS field effect transistors F1 and F2 are turned off, and thus the external video inputted through the external video jack 4 and the external audio jack 5 and After the audio signals EVS and EAS are buffered through the MOS field effect transistors F3 and F4, respectively, and again through the buffer units 51 and 52, the video processor 10 and audio It is input to the processing unit 20 and processed, and at this time, the TV video signal TVS and the TV audio signal TAS are blocked.

As described so far, conventionally, the slide switch must be operated to switch to the TV mode or the external signal mode. However, in the present invention, the TV is normally in the TV mode where the plug is not inserted into the external audio / video jack. When the plug is inserted into the jack, the mode is automatically switched to the external signal mode, which makes the mode switching operation very convenient.

Claims (2)

A control unit 30 which detects whether or not a plug is inserted into the external video and audio jacks 4 and 5 by a potential difference and switches according to the selection signal output of the control unit 30; The signal switching device of the laptop V-C comprises a selection unit 40 for selectively outputting the external video and audio signals (EVS), (EAS) or the TV and audio signals (TVS), (TAS). The signal of the laptop V-Cell according to claim 1, wherein the controller 30 is configured to receive a low potential and output a selection signal when a plug is inserted into the external video and audio jacks 4 and 5, respectively. Switching device.