KR930004546Y1 - Teletext circuit of vcr - Google Patents

Abstract

No content.

Description

VRF's Text Multiple Broadcast Receiver

1 is a block diagram of a conventional video signal receiving circuit of VRC.

2 is a block diagram of the character multiple broadcasting receiver circuit of the present invention V-Cal.

3A to 3D are waveform diagrams of respective parts of FIG. 2.

* Explanation of symbols for main parts of the drawings

1: control signal output unit 2: high frequency conversion unit

3: tuner 4: intermediate frequency amplifier and detector

5, 12: switching unit 6: image signal processing unit

7: On Screen 8: Buffer

9: Remote Controller 10: Text Multiple Decoder

11 color encoder 13 switching logic part

CPT: Color Picture Tube

The present invention relates to a teletext receiver circuit, and more particularly, to a teletext receiver receiver of VLC suitable for receiving a teletext receiver using a tuner tuner.

FIG. 2 is a block diagram of a conventional video signal reception circuit. As shown in FIG. 2, tuning data (D1), character data (D2), and TV / V-select signal (TV / ), Tuner / line select signal (TUN / The control signal output unit 1, which outputs the control signal output unit 1, and the image signal of the high frequency FR are input from the antenna ANT1, and the image signal processed by the system is converted to the high frequency and then the antenna ANT3 A high frequency conversion unit 2 which transmits a high frequency signal RF transmitted to a television receiver via the antenna ANT1 through a antenna ANT2 as it is through the antenna ANT2, and is input from the high frequency conversion unit 2 The tuner 3 selects a broadcast signal of one channel according to the tuning data D1 of the control signal output unit 1 among the broadcast signals, and amplifies and detects an outgoing signal of an intermediate frequency input from the tuner 3. The intermediate frequency amplifier and detector 4 for outputting the separated audio signal AU and the video signal V, and the video signal V and the line in video input from the intermediate frequency amplifier and detector 4. Video signal input from the (Line in Video) jack J1 ( V1), the selection signal (TUN / of the control signal output unit 1) A switching unit 5 for selecting one video signal according to the present invention, an image processing unit 6 for recording or reproducing the video signal selected by the switching unit 5, and the control signal output unit 1 On-screen unit 7 for inserting the on-screen character signal into the output signal of the image processing unit 6 when the character data (D2) of the) and buffered amplified output signal of the on-screen unit 7 The video line jack VLJ and a buffer 8 respectively output to the high frequency converter 2 are described below.

When the high-potential TV selection signal TV is input to the high frequency conversion unit 2 in the control signal output unit 1, the broadcast signal of the residual sideband method input through the antenna ANT1 is converted into a high frequency conversion unit 2. The tuner 3 is provided through the tuner 3, and the tuner 3 selects and outputs one broadcast signal according to the tuning data D1 input from the control signal output unit 1. The broadcast signal of the intermediate frequency output from the tuner 3 is amplified and detected by the intermediate frequency amplification and detector 4 to separate the audio signal AU and the video signal V, and thus the separated video signal ( V) is applied to the switching unit 5, in which the switching unit 5 receives the image signal V input from the intermediate frequency amplifier and detector 4 and the image input from the line-in video jack J1. Among the signals V1, the video signal V is selected in the tuner mode according to the selection signal TUN / LIN of the control signal output unit 1, and the video signal V1 is selected in the line mode.

Accordingly, the image signal V selected in the tuner mode is provided to the on-screen unit 7 through the image processor 6 for processing playback, recording, and the like, and the on-screen unit 7 is the control signal output unit. When the text data D2 is applied from (1), the on-screen text signal is inserted into the video signal V input from the video processor 6 and outputted. The video signal V including the text signal is output. The impedance is matched through the buffer 8 and then provided to the image line jack VLJ and the high frequency converter 2, respectively.

And the high frequency conversion unit 2 is a selection signal (TV / input from the control signal output unit 1 In the TV mode, the broadcasting signal RFin input through the antenna ANT1 is directly transmitted to the TV through the antenna ANT2. In the BC mode, the input video signal V is modulated into the broadcasting signal RFout. To TV.

However, since such a conventional circuit is not provided with a circuit for receiving text multiplexing, a user needs to inject a separate text multicasting receiving circuit to watch the text multicasting, which is cumbersome and has a problem of boundary burden.

In order to solve the above problems, the present invention adds a switching circuit, a decoder, and an encoder to the existing VRC image signal receiving circuit, and can receive the text multicast. .

FIG. 2 is a block diagram of the VCD's character multi-broadcast reception circuit of the present invention. As shown in this figure, the tuning data (D1), the character data (D2), and the V / VAL selection signal (TV) required by the system are shown. / VCR), tuner / line select signal (TUN / A control signal output unit 1, a high frequency conversion unit 2 for converting a frequency between the antennas ANT1, ANT2 and the system, and a broadcast signal input from the high frequency conversion unit 2 A tuner 3 for selecting one broadcast signal according to the tuning data D1 of the control signal output unit AU, and an audio signal AU and a composite video signal CVS1 from the output signal of the tuner 3; The intermediate frequency amplification and detection unit 4 for separating the signal and the selection signal TUN / A switching unit 5 for selecting one of the composite video signal CVS1 applied from the intermediate frequency amplifier and detector 4 and the composite video signal CVS1 ′ applied from the line-in video jack J1. And an image processor 6 for performing image processing such as recording or reproducing the composite video signal CVS2 output from the switching unit 5, and text data D2 from the control signal output unit 1 is applied. The on-screen unit 7 for inserting an on-screen text signal into the output signal of the image processing unit 6, and amplifying the output signal of the on-screen unit 7 to the image line jack (VLJ) and high frequency conversion. In a video signal receiving circuit composed of a buffer (8) for outputting to a section (2), the control signal output section (1) is provided with a key to the control signal output section (1) such that the character multicast control data (D4) is output. A remote controller 9 for outputting this signal, the character multicast control data D4 and an on-screen synchronization signal; The red signal R, the green signal G, the blue signal B and its control in the composite video signal CVS1 input from the intermediate frequency amplifier and detector 4 according to C-syn. Extracts the signal RGBC, decodes it, and outputs the multiplex decoder 10 to receive the on-screen synchronization signal C-syn, the red-green-blue signal RGB, and the control signal RGBC. One of a color encoder 11 reconstructed into a signal CVS3 and a complex video signal CVS2 input from the on-screen circuit 7 or a compressed video signal CVS3 input from the color encoder 11; Selects and outputs it to the buffer 8, a text request signal TXT of the control signal output unit 1, and a teletext detection signal XPAR of the character multiple decoder 10; According to this configuration by adding a switching logic unit 13 for controlling the switching of the switching unit 12 Described in detail with reference to FIG. 3 showing a waveform chart of each part of operations and effects of the devised in FIG. 2 as follows.

The broadcast signal of the high frequency RF inputted to the high frequency conversion unit 2 through the antenna ANT1 is directly received through the antenna ANT2 when the TV selection signal TV is input from the control signal output unit 1. Is provided to the side of the Is provided to the tuner 3, its frequency characteristic is the residual sideband method.

On the other hand, the tuner 3 receives the high frequency signal FR from the high frequency conversion unit 2 converts the high frequency signal RF into the intermediate frequency band of the Korean broadcast standard image carrier (45.75MH _Z ), The tuning control signal is the tuning data D1 of the control signal output section 1.

That is, the tuner 3 receives the tuning data D1 of the control signal output unit 1, selects only one channel broadcast signal from among a plurality of broadcast signals, and then converts the signal into an intermediate frequency signal. The intermediate frequency is again amplified by a signal of a magnitude detectable by the intermediate frequency amplification and detection unit 4, where the audio signal AU and the composite image signal CVS1 are respectively detected.

In addition, the audio signal AU detected by the intermediate frequency amplification and detection unit 4 is sent to an external audio signal processing circuit not shown here, wherein the composite image signal CVS1 is fixed to the switching unit 5. Provided to the terminal C1 and output to the character multiple decoder 10 on the other hand, the character multiple decoder 10 extracts the character multiple broadcast signals from the red, green, and blue signals. The control signal RGBC of the R, R, and B and the red, green, and blue signals RGB thereof is detected, and includes the control signal RGBC color information and the color carrier signal.

On the other hand, the switching unit 5 selects the composite video signal CVS1 output from the intermediate frequency amplifier and detector 4 when the tuner selection signal TUN is input from the control signal output unit 1. When the line selection signal LIN is input, the line composite video signal CVS1 is selected and output to the video signal processor 6.

On the other hand, the composite video signal CVS2 passes through the image processor 6 as it is and is provided to the on-screen unit 7 when the image processor 6 is not in the play mode, and the on-screen unit 7 controls the control. When the character data D2 is input from the signal output section 1, the composite video signal CVS2 is output to the fixed terminal b2 of the switching section 12 as it is.

On the other hand, if the user presses the character multiple key on the remote control (9), the character multiple control data (D4) including the page of the character multiple broadcast and other special information in the control signal output unit 1 is the character multiple decoder (10). The character multiple decoder 10 is output from the composite video signal CVS1 output from the intermediate frequency amplification and detection unit 4, and the red, green, and blue signals RGB and the control signal RGBC. After extracting the signal and outputting it to the color encoder 11 in the high potential region of the teletext detection signal as shown in FIG. 3a in accordance with the on-screen synchronization signal C-syn as shown in FIG. XPAR) is output to the switching circuit unit 13.

Accordingly, the color and coder 11 reconstructs the red, green, and blue signals R, G, and B and outputs the composite image signal CVS3, wherein the control signal output unit 1 is shown in FIG. Outputs the text request signal TXT.

In addition, the switching logic unit 13 controls the switching unit 12 when the teletext detection signal XPAR is input at high potential, as shown in FIG. 3d, so that its movable terminal a2 is short-circuited to the fixed terminal c2. Therefore, the multi-character composite video signal DVS3 output from the color encoder 11 is outputted to the buffer 8 through the switching unit 12, and no teletext signal is detected so that the teletext detection signal XPAR When the low potential is inputted, the switching logic unit 13 outputs a low potential, so that the switching unit 12 is turned off so that the movable terminal a2 is short-circuited to the fixed terminal b2. The composite video signal CVS2 output from the output unit 12 is output to the buffer 8 through the switching unit 12.

As a result, the buffer 8 inputs the character multiplex composite video signal CVS3 and the general composite video signal CVS2, buffers and amplifies the mixed video signal, and outputs it to the video line jack VLJ and the high frequency converter 2. The high frequency conversion unit 2 converts the composite video signal CVS4 input from the buffer 8 into a high frequency RF, and then transmits the composite video signal CVS4 to the television receiver through the antenna ANT2. You will be able to watch teletext.

As described in detail above, the present invention adds a decoder, an encoder, and a switching unit to the tuner of V-CAL, and enables the viewer to insert a character TV into the video signal of the TV, thereby allowing the viewer to use a general television receiver without economic burden. There is an advantage that you can watch through the text multicast.

Claims (1)

The high frequency converter 2, the tuner 3, the intermediate frequency amplifier and detector 4, the switching unit 5, and the image processing unit 6 are sequentially input to the composite video signal DVS2. V-C is composed of an on-screen unit 7 for inserting and outputting on-screen information, and a buffer 8 for amplifying the output signal of the on-screen unit 7 and outputting it to the high-frequency converter 2. In the tuning circuit of the control signal output unit 1, the control signal output unit 1 controls the red, green, and blue signals RG B and the control signal from the output composite video signal CVS1 of the intermediate frequency amplification and detection unit 4. After extracting the signal RGBC and combining the multi-text decoder 10 outputting the same with the teletext detection signal PAR, the red, green, and blue signals RG B are combined into a composite video signal CVS3. A color encoder 11 to be outputted to the display device; and a composite video signal CVS2 of the on-screen unit 7 or a composite video signal CVS3 of the color encoder 11. And a switching logic unit for controlling the switching of the switching unit 12 according to the teletext detection signal XPAR of the character multiple decoder 10. And V13's character multiple broadcast receiver circuit.