KR19990049716A - Teletext module device and control method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext device, and more particularly to a TV screen outputting coded information such as text or graphic symbols on a line not used in a field of a general TV. A demux unit 30 for demultiplexing demodulated data, a video decoder 42 for decoding a compressed video signal, an audio decoder 44 for decoding a compressed audio signal, and audio decoded in the audio decoder An encoder for receiving a signal, a video signal decoded by the video decoder and teletext data, and outputting the signal to a TV; and a system controller for outputting a control signal to control the demux, the video decoder, and the encoder. Outputs only teletext characters on the screen, or outputs both teletext characters and video signals It is done.

Description

Teletext module device and control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext device, and more particularly, to display coded information, such as text or graphic symbols, on lines not used in a field of a general TV while the TV screen is not output or while the TV screen is output. It further relates to a teletext module device and a control method which can be displayed.

In the related art, since only one channel can be used because teletext characters or graphics are transmitted in an analog manner, there is a problem in that radio resources cannot be usefully used.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and additionally outputs to a TV screen by using a line not used in a conventional TV by digitally transmitting teletext characters or graphics, or a TV screen. Apart from the present invention, the present invention relates to a teletext module apparatus and a control method of outputting only teletext characters or graphics.

The teletext module device of the present invention configured as described above includes a tuner unit for removing and demodulating a carrier signal from data received from an antenna, and a demux unit for receiving and demodulating data and a clock signal demodulated by the tuner unit. And a first DRAM for storing and buffering data input to the demux unit, a video decoder for decoding a compressed video signal among demultiplexed data by the demux unit, and video data decoded by the video decoder. A second DRAM for storing a second memory, an audio decoder for decoding an audio signal multiplexed by the demux unit, an audio signal decoded by the audio decoder, a video signal decoded by the video decoder, and teletext data being received. An encoder unit to output to the demux unit and the And a system controller for outputting a control signal to control the video decoder and the encoder.

Teletext control method of the present invention for achieving the above object is to receive the decoded video signal and the decoded audio signal, such as teletext characters from the encoder, the teletext characters and the like according to the control signal from the system control unit It is characterized by outputting.

1 is a block diagram of a teletext module apparatus and a control method of the present invention;

2 is a block diagram showing a configuration for measuring a teletext character, etc. of the present invention;

3 is a block diagram showing the inside of the teletext portion of the present invention;

4 is a timing diagram of data according to the present invention.

<Description of Symbols for Major Parts of Drawings>

20: Tuner part 30: Demux part

40: first DRAM 42: video decoder

44: audio decoder 50: encoder section

52: teletext portion 54: encoder

60: system control unit

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment according to the spirit of the present invention "teletext module device and control method" in detail as follows.

As shown in FIG. 1, the teletext module apparatus and control method of the present invention include an antenna 10 for receiving data in a 950-2015 MHz band from a satellite, and a carrier signal from a signal received from the antenna 10. A tuner unit 20 to remove and demodulate, a demux unit 30 to receive and multiplex data and a clock signal output after being demodulated by the tuner unit 20, and input to the demux unit 30. The first DRAM 40 buffers the data to be decoded, the video decoder 42 decodes the compressed video signal output after being demultiplexed by the demux unit 30, and the video decoder 42. A second DRAM 46 for storing the decoded video data, an audio decoder 44 for decoding the audio signal multiplexed by the demux unit 30, an audio signal decoded by the audio decoder 44, remind An encoder unit 50 for receiving a video signal decoded by the video decoder 42 and outputting a signal to a TV, the demux unit 30, the video decoder 42, and the encoder unit (encoder unit 50). System control unit 60 for outputting a control signal to control the control panel).

The tuner unit 20 receives an audio, video, control signal, etc. from the antenna 10 and converts the intermediate frequency into an intermediate frequency, and the intermediate frequency by the intermediate frequency converting unit 22. To the ADC unit 24 for converting the analog data into digital data after conversion to the QPSK demodulator 26 for converting and demodulating the analog signal into a digital signal by the ADC unit 24 to control the carrier signal. Consists of.

In the intermediate frequency converter 22, a tuner 221 for converting an input signal of 950-2015 MHz into an intermediate frequency of 479.5 MHz, and an I / Q for demodulating the analog signal converted to an intermediate frequency in the tuner 221. The demodulator 222 is configured.

And the encoder unit 50 is a teletext unit 52 for outputting a teletext signal under the control of the system control unit 60 for teletext broadcasting, the audio signal output from the audio decoder 44 and the After receiving the video signal output from the video decoder 42 and the teletext signal output from the teletext unit 52 and decoding these signals, RF (Radio Frequency) terminal is separated from the video and audio signal And an encoder 54 which outputs to the outside via the SCA output terminal and the S-VHS terminal which outputs only a video signal.

In addition, as shown in FIG. 3, the teletext unit 52 includes a RAM unit 521 in which data related to teletext is stored by a write address of the write pointer unit 523, and data stored in the RAM unit 521. Serial output unit 525 to control the output to the serial (Serial) by the read address of the read pointer unit 522, and the flag logic to check whether or not the normal when the data is stored or output in the RAM unit 521 And an extension logic unit 526 which controls the write address and the read address to be selectively outputted from the flag logic unit 523 and the read pointer unit 522.

The system controller 60 may include a DRAM unit 62 for storing data input from the outside, a DRAM controller 64 for controlling the DRAM unit 62, information about a teletext character, and the like. And a ROM 66 that stores information relating to data size, an address decoder 68 for decoding the address, and a CPU 69 for controlling the apparatus as a whole.

FIG. 2 illustrates an apparatus for setting an environment according to the present invention, wherein an analog bit stream is generated in consideration of a teletext data transmission rate and a signal generator 100 is transmitted in the same form as data transmitted from a broadcasting station. And a transmitter 101 for modulating and transmitting analog data transmitted from the signal generator 100 in a quadrature phase shift keying (QPSK) scheme, and a teletex for receiving data transmitted from the transmitter 110. A receiver 120, a divider 130 for separating data output from the teletex receiver 120, and data separated by the divider 130 are input to check whether a video signal and a text signal are normally transmitted. Since it is composed of a measuring device 140 for the purpose of transmitting the signal transmitted from the broadcasting station even if the actual broadcasting station does not Is that to determine whether the teletext characters are normally printed on by outputting a TV signal.

FIG. 4 is a timing chart according to the present invention, and FIG. 4 (a) shows a timing at which a video signal, a teletext signal, and an audio signal are continuously input. In FIG. 4 (b), a horizontal synchronization signal is active. After receiving only the necessary data from among the data relating to the plurality of broadcasting stations input to the antenna 10 from the satellite, the data necessary for teletext broadcasting is output.

Referring to the accompanying drawings, the effects of the present invention configured as described above are as follows.

First, when a plurality of signals from the satellite is input to the antenna 10, as shown in Figure 4, such a signal converts the received signal of 950-2015MHz to 479.5MHz, which is an intermediate frequency at the tuner 221 and thus intermediate The analog data converted to frequency is demodulated by the I / Q demodulator 222.

Thereafter, the ADC unit 24 converts the analog data into digital data and inputs the QPSK demodulator 26 to remove the carrier signal from the data received from the satellite.

As such, the data from which the carrier signal is removed from the QPSK demodulator 26 is applied to the demux unit 30 along with a clock signal, and demultiplexed into a video signal and an audio signal by a control signal of the system controller 60. The video decoder 42 then decodes the compressed video signal.

In addition, the audio signal is demultiplexed by the demux unit 30 and then decoded by the audio decoder 44 and input to the encoder unit 50.

When data about teletext stored in the RAM unit 521 of the teletext unit 52 is input to the encoder 54 by a control signal of the system controller 60, the video decoder 42 and Video data and audio data output from the audio decoder 44 are received together with the teletext data, encoded, and output to the TV.

In this case, the encoder 54 may output only normal video data and audio data to the TV according to the control signal of the system controller 60, and may output only the teletext text in order to broadcast the teletext text. In addition, teletext characters can be transmitted together with general video data and audio data.

In the teletext module apparatus and control method of the present invention configured as described above, when a text or a graphic symbol is transmitted to a line not used in a field of a general TV, the digital text is transmitted to increase the channel, thereby only data relating to the teletext. The present invention can display, or additionally transmit teletext characters to an existing broadcast.

Claims (9)

A tuner unit which removes and demodulates a carrier signal from data received from an antenna, a demux unit that receives and demultiplexes the demodulated data and a clock signal, and stores and buffers data input to the demux unit. A first DRAM, a video decoder for decoding a video signal compressed from the demultiplexed data by the demux unit, a second DRAM for storing the video data decoded by the video decoder, and the demux unit. An audio decoder for decoding the multiplexed audio signal by the audio decoder, an audio signal decoded by the audio decoder, a video signal decoded by the video decoder, and teletext data and output to a TV, the demux unit and the Control to control the video decoder and the encoder unit It consists of the system control module teletext device, characterized in that for outputting. The apparatus of claim 1, wherein the tuner unit comprises: an intermediate frequency converter for converting a signal received from the antenna into an intermediate frequency; an ADC unit for converting an analog signal converted to an intermediate frequency by the intermediate frequency converter into a digital signal; And a QPSK demodulator for demodulating data converted into a digital signal by the ADC to control a carrier signal. The I / Q demodulation according to claim 2, wherein the intermediate frequency converter is configured to tune a 950-2015 MHz signal output from the satellite to 479.5 MHz, which is an intermediate frequency, and to demodulate analog data converted from the tuner to an intermediate frequency. Teletext module device composed of parts. The apparatus of claim 1, wherein the encoder unit outputs a teletext signal under the control of the system controller for teletext broadcasting, an audio signal output from the audio decoder, and a video signal output from the video decoder. And an encoder for receiving the teletext signals output from the teletext unit and decoding the signals. The method of claim 4, wherein the teletext unit controls the teletext to store data related to the teletext by a write address of a write pointer unit, and the data stored in the RAM unit to be serially output by a read address of a read pointer unit. And a flag logic unit for checking whether or not data is normal when data is stored or output to the RAM unit, and an expansion logic unit for selectively outputting a write address and a read address from the write pointer and the read pointer. Teletext module device characterized in that. 2. The system of claim 1, wherein the system control unit comprises: a DRAM unit for latching data input from the outside; a DRAM control unit for controlling the DRAM unit; a ROM storing information on teletext characters, i.e., data size; And an address decoder for decoding the address, and a CPU for controlling the system control unit as a whole. And receiving a decoded video signal and a decoded audio signal from an encoder and outputting the teletext character according to a control signal from the system controller. 8. The method of claim 7, wherein the teletext character or the like transmits information by using an unused line in a field of the TV. The method of claim 7, wherein the teletext character is output in addition to the video signal or separately from the video signal.