KR100197558B1 - The method of simultaneously regenerating two channels in converter - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

How to play two channels at the same time in the converter.

2. The technical problem to be solved by the invention

With one converter, you can watch cable broadcasts on the same channel even if you have two or more televisions or PIP televisions in the same household, but you cannot watch cable broadcasts on different channels.

3. Summary of Solution to Invention

A method of reproducing different channels by plural playback means, and monitoring reproduced video and audio signals corresponding to different channels through two televisions or PIP televisions.

4. Important uses of the invention

Converter

Description

How to play two channels at the same time in the converter

1 is a block diagram of a conventional converter for reproducing one channel.

2 is a connection diagram in which an external output end of a conventional converter and an external input end of a television are connected.

3 is a block diagram of a converter for simultaneously reproducing two channels according to the present invention.

4 is a control flow diagram for simultaneously playing two channels in accordance with the present invention.

5 is a connection diagram of an external output stage of a converter and an external input stage of a television for simultaneously reproducing two channels according to the present invention.

The present invention relates to a cable television converter, and more particularly, to a method for simultaneously reproducing and outputting different channels.

The operation of the conventional converter will be described with reference to FIG. 1, which is a block diagram of a converter for reproducing one channel.

The tuner 112 detects a specific channel by tuning to a frequency selected from a phase locked loop (PLL) 132 in a signal corresponding to a plurality of channels input through a cable.

The demodulator 114 demodulates a specific frequency detected by the tuner 112 and detects a modulated signal corresponding to an image and an audio.

The descrambler 116 can play back only when a signal demodulated from the demodulator 114 is a signal corresponding to an effective channel among a plurality of channels input through a cable. In other words, the device decrypts and reproduces an encrypted signal of a valid channel.

An On Screen Display (OSD) 118 mixes a character or a picture with a signal output from the descrambler 116 to display a character or a picture on a screen such as a channel or a volume. .

The video buffer 120 buffers and outputs a video signal to be reproduced.

The stereo module 124 receives a voice signal from the demodulator 114 and outputs a voice signal according to a broadcast corresponding to the voice signal during mono broadcasting, stereo broadcasting, or voice multicasting. do.

The volume controller 126 adjusts the volume of the audio signal output from the stereo module 124 in response to external manipulation.

The audio buffer 128 buffers and outputs the volume-adjusted voice signal.

An RF modulator 122 modulates an image signal output from the video buffer 120 and an audio signal output from the audio buffer 128 into RF signals.

The PLL 132 generates a corresponding low frequency filter to detect only a frequency corresponding to a channel selection signal input from the outside among the signals received by the tuner 112 under the control of the microprocessor 110. Provided to the tuner 112 through 130.

The buffer 134 buffers a control signal output from the microprocessor 110 to control the descrambler 116.

The sound selector 136 selects the type of voice signal received by the stereo module 124 under the control of the microprocessor 110.

The inactive memory 142 stores an operating program of the microprocessor 110.

The channel display unit 144 displays the channel currently being reproduced under the control of the microprocessor 110.

The infrared receiver 146 detects an infrared signal input from an external remote controller and provides it to the microprocessor 110.

The key input unit 148 has a plurality of keys, and provides key data according to the key input to the microprocessor 110.

In the converter having the structure as described above, the microprocessor 110 controls the PLL 132 according to the channel selection signal input through the infrared receiver 146 or the key input unit 148. Under the control of the microprocessor 110, the PLL 132 generates a frequency corresponding to the selected channel and outputs the frequency to the tuner 130 through the low band filter 130. The tuner 112 detects a frequency input from the PLL 132 from frequencies corresponding to a plurality of channels received through a cable. The detected signal is input to the demodulator 114 and subjected to a demodulation process, and the descrambler 116 receiving the demodulated signal is controlled by the microprocessor 110 through the buffer 134 and the demodulated signal. It is determined whether is a valid channel. In the case of an effective channel, the descramble, that is, the encrypted signal, is decrypted and output. The decoded image signal is mixed with characters or symbols in the OSD 118 under the control of the microprocessor 110, and the mixed image signal is buffered and output from the video buffer 120.

The sound selector 136 selects a sound type of the signal output from the demodulator 114 under the control of the microprocessor 110. The stereo module 124 outputs a voice signal according to the selected sound type. In addition, the microprocessor 110 controls the volume controller 126 according to the volume control signal input from the infrared receiver 146 or the key input unit 148 and the magnitude of the voice signal input from the stereo module 124. Adjust the output. The volume-adjusted voice signal is buffered and output through the audio buffer 128.

The video and audio signals output from the video buffer 120 and the audio buffer 128 are converted into RF signals by the RF modulator 122.

An image for reproducing and outputting an image signal to the tuner 112, the demodulator 114, the descrambler 116, the buffer 134, the OSD 118, the video buffer 120, and the RF modulator 122. Also called reproducing means, the stereo module 124 including the tuner 112, the demodulator 114, and the audio reproducing means for reproducing and outputting a voice signal to the audio buffer 128.

2 is a connection diagram in which an external output terminal and an external input terminal of a television are connected in a conventional converter, and the conventional converter has an RF output terminal, a video output terminal and an audio output terminal as an external output terminal 210, and the television has an external input terminal 212. It has an RF input stage, a video input stage and an audio output stage. In the converter the RF output is connected to the television's RF input and the video output is connected to the television's video input. The audio output is also connected to the audio input of the television. The RF signal output to the RF output terminal is a signal mixed with the video signal and the audio signal as described above, and thus becomes the same signal as the signal output to the video output and audio output terminals.

As described above, the conventional converter receives a signal corresponding to a plurality of channels through a cable, but reproduces only one signal among the input signals. Therefore, even if you have a picture-in-picture (PIP) television with two channels on your screen, you could only watch one cable channel.

Also, if you have two or more TVs in one household, but have a converter, you can watch cable broadcasting on the same channel, but you cannot watch cable broadcasting on different channels.

Accordingly, an object of the present invention to solve the above problems is to provide a method for enabling the user to watch different channel cable broadcasting with one converter and a PIP television.

Another object of the present invention is to provide a method for watching cable broadcasting of different channels with one converter and two televisions.

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

FIG. 3 is a block diagram of a converter for simultaneously reproducing two channels according to the present invention, which includes video and audio reproducing means for reproducing video and audio signals, and PLLs 332A and 332 for generating frequencies corresponding to a selected channel. And low band filters 330A and 330B for filtering the frequencies output from the PLLs 332A and 332B. Hereinafter, the video and audio reproducing means for reproducing the video and audio signal corresponding to the first channel, and the PLLs 332A and 332B and the low pass filter 330A and 330B are called first reproducing means and correspond to the second channel. Video and audio reproducing means for reproducing video and audio signals, PLLs 332A and 332B and low pass filters 330A and 330B for reproducing video and audio signals are called second reproducing means. By duplexing the reproducing means, video and audio signals of two channels selected from a plurality of channels received through the cable are output through the first and second reproducing means, respectively.

The process of reproducing video and audio signals of a corresponding channel through the first and second reproducing means has been described above with reference to FIG.

4 is a control flow diagram for simultaneously reproducing two channels according to the present invention, a selection process for selecting one playback means from the plurality of playback means, and a signal of a channel selected through the playback means selected in the selection process. Regeneration is performed.

5 is a connection diagram of an external output stage of a converter and an external input stage of a television for simultaneously reproducing two channels according to the present invention.

FIG. 5 (a) is a connection diagram in which the external output terminal 510 of the converter and the external input terminals 512 and 514 of the two televisions are connected, and the first RF output terminal provided in the external output terminal 510 of the converter. The RF output 1 is connected to an RF input terminal (RF input) provided in the external input terminal 512 of the first television to monitor a channel reproduced from the first reproducing means. In addition, the second video output terminal VIDEO2 provided at the external output terminal 510 of the converter is connected to the video input terminal VIDEO INPUT provided at the external input terminal 514 of the second television, and the external output terminal 510 of the converter. The second audio output terminal SOUND2 provided at the second audio output terminal SOUND2 is connected to an audio input terminal SOUND INPUT provided at the external input terminal 514 of the second television to monitor a channel reproduced from the second reproducing means.

(B) of FIG. 5 is a connection diagram in which the external output terminal 510 of the converter according to the present invention is connected to the external input terminal 516 of the PIP television. The image corresponding to the first channel reproduced by the first reproducing means and The audio signal is output to the first RF output terminal (RF output 1) provided in the external output terminal 510 of the converter, and the same signal as the signal output to the first RF output terminal (RF output 1) is output to the first video output terminal (VIDEO1). And is output to the first audio output terminal SOUND1. In addition, the video and audio signals corresponding to the second channel reproduced by the second reproducing means are output to the second RF output terminal (RF output 2) provided in the external output terminal 510 of the converter, and the second RF output terminal (RF output) A signal such as a signal output to 2) is output to the second video output terminal VIDEO2 and the second audio output terminal SOUND2. The first RF output terminal (RF output 1) is connected to an RF input terminal (RF input) provided in the external input terminal 516 of the PIP television to monitor the channel reproduced from the first reproducing means. In addition, the second video output terminal VIDEO provided at the external output terminal 510 of the converter is connected to the video input terminal VIDEO INPUT provided at the external input terminal 516 of the PIP television, and is connected to the external output terminal 510 of the converter. The provided second audio output stage SOUND2 is connected to an audio input stage SOUND INPUT provided at an external input stage 516 of the PIP television to monitor a channel reproduced from the second reproducing means.

Therefore, an embodiment of the present invention will be described in detail with reference to FIGS. 3, 4, and 5.

First, referring to (a) of FIG. 5, a process of reproducing different channels through a plurality of televisions will be described. In operation 410 of FIG. 4, the microprocessor 310 generates an image from the infrared receiver 346 or the key input unit 348. Determine whether there is a key input for mode selection. When the key input is detected, the microprocessor 310 determines the selected mode of the first channel mode or the second channel mode in step 412. When the first channel mode is selected in step 412, the microprocessor 310 proceeds to step 414 to set the first channel mode. When the second channel mode is selected, the microprocessor 310 proceeds to step 418. Set the second channel mode.

After the first channel mode is set in step 414, if a signal for selecting a channel to be played back is detected from the infrared receiver 346 or the key input unit 348 in step 416, the selected channel is played through the first playback means. However, if the second channel mode is set in step 418 and a signal for selecting a channel to play from the infrared receiver 346 or the key input unit 348 is detected in step 420, the selected channel is played through the second playback means. The process of reproducing the channel selected from the first and second reproducing means has been described with reference to FIG.

The video and audio signals reproduced from the first reproducing means are output to the RF output 1 provided in the external output terminal 510 of the converter, and the video signal among the signals output from the RF output 1 is video 1 and the audio signal is sound 1. Is output. In addition, the video and audio signals corresponding to the channel reproduced by the second reproducing means are output to the RF output 2, the video signal of the signal output to the RF output 2, the audio signal is output as sound 2. And the signal output from the RF output 1 is provided to the RF input provided in the external input terminal 512 of the first television is monitored. In addition, the video signal output from the video 2 is provided to the video input terminal (VIDEO INPUT) provided in the external input terminal 514 of the second television, the audio signal output from the sound 2 to the external input terminal 514 of the second television. It is provided to the provided sound input terminal (SOUND INPUT) to monitor the signal of the channel reproduced from the second reproducing means.

Thus, different channels are monitored through two televisions.

In addition, referring to (b) of FIG. 5, a process of reproducing different channels through a PIP television will be described. The process of selecting and playing two channels is the same as the process of reproducing the two televisions described above. It will be omitted.

The video and audio signals output from the first reproducing means are provided and monitored through the RF output 1 provided in the external output terminal 510 of the converter to the RF input terminal provided in the external input terminal 516 of the PIP television. In addition, the video signal output from the second playback means is provided to the video input terminal (VIDEO INPUT) provided in the external input terminal 516 of the PIP television via the video 2 of the external output terminal 510, the second playback means The audio signal output from the audio signal is provided to and monitored by the sound input terminal provided in the external input terminal 516 of the PIP television via sound 2 of the external output terminal 510. Thus, different channels are monitored on two screens of PIP television.

As described above, the present invention has the effect of reproducing a plurality of cable television broadcasts in one converter and outputting them through a plurality of televisions or PIP televisions so that different cable broadcasts can be viewed.

Claims (2)

A method for reproducing signals corresponding to different channels and outputting them to a plurality of monitors in a converter having a plurality of reproducing means for reproducing a signal input through a cable, wherein the reproducing means is one of the plurality of reproducing means. And a reproducing process of reproducing a signal of a channel selected by the reproducing means selected in the selecting process. A first RF output stage and a first video output stage and a first audio output stage for outputting a playback signal corresponding to a first channel, a second RF output stage and a second video output stage and a second audio output stage for outputting a playback signal corresponding to a second channel; A method of connecting a converter for outputting signals of a plurality of channels and a PIP television having an RF input terminal, a video input terminal, and an audio input terminal for simultaneously viewing a plurality of screens through a cable, the first RF output terminal of the converter; A first connection process for connecting the RF input terminal of the PIP television, a second video output terminal of the converter and a video input terminal of the PIP television, and a second audio output terminal of the converter and an audio input terminal of the PIP television; Terminal connection method characterized in that the second connection process.