KR19980046327A - PIP device using a plurality of MPEG decoders - Google Patents

Abstract

The present invention provides a PIP apparatus using a plurality of MPEG decoders that can implement a PIP function for simultaneously watching two broadcasts on one TV receiver using two MPEG decoders.

According to the present invention, in the digital satellite broadcasting receiving system, outputs of the first and second MPEG decoders 4 and 5, and the first and second MPEG decoders 4 and 5, which decode signals for each channel. PIP control unit for controlling the PIP screen size adjustment of the first and second down samplers 6 and 7 and the first and second down samplers 6 and 7 by adjusting the signal. (8) a CPU 9 controlling the demultiplexer 3 and the PIP controller 8 according to a user's key input, and the first and second down samplers under the control of the PIP controller 8; And a mixer 10 that mixes the outputs of (6) and (7) to form a PIP screen for the entire screen.

Description

PIP device using a plurality of MPEG decoders

1 is a block diagram of a PIP apparatus using a plurality of MPEG decoders according to the present invention.

Explanation of symbols on the main parts of the drawings

1: satellite antenna 2: channel decoder

3: demultiplexer 4, 5: first and second MPEG decoders

6, 7: first and second down sampler 8: PIP control unit

9: CPU10: mixer

11: NTSC encoder

The present invention relates to a satellite broadcast receiving system, and more particularly, to a plurality of MPEG decoders for implementing a PIP function for simultaneously watching two broadcasts on a single TV receiver using two MPEG (Moving Picture Experts Group) decoders. It relates to a PIP device used.

In the analog TV, which is generally implemented, the PIP function is being performed, and while watching one broadcast, the PIP function can be used to simultaneously view another broadcast through a small window.

In the future, digital HDTV broadcasting, which will be implemented in the future, will be multi-channeled in the age of satellite broadcasting.

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and an object of the present invention is to provide a PIP apparatus using a plurality of MPEG decoders capable of processing PIP pictures of digital satellite broadcast signals using a plurality of MPEG decoders.

Another object of the present invention is to provide a PIP apparatus using a plurality of MPEG decoders that allow the adjustment of a PIP screen size when processing a PIP screen of a digital satellite broadcast signal.

A PIP apparatus using a plurality of MPEG decoders according to the present invention for achieving the above object, in the digital satellite broadcasting receiving system, decodes the signal for each channel output by demultiplexing using the first and second MPEG decoders, The output signals of the first and second MPEG decoders are adjusted by the first and second down samplers according to the control of the PIP control unit to adjust the PIP screen size so that the final combined image can be obtained through the mixer. It is characterized by.

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

FIG. 1 is a block diagram of a PIP apparatus using a plurality of MPEG decoders according to the present invention, and includes a channel decoder 2 and a channel decoder for receiving and decoding satellite broadcast signals from a satellite antenna 1. A demultiplexer (3) for demultiplexing the output signals of 2) and outputting video / audio signals for each channel, and first and second MPEG decoders (4) for demultiplexing and decoding signals for each channel (5) ) And first and second down samplers 6 and 7 for adjusting the PIP picture size by adjusting the output signals of the first and second MPEG decoders 4 and 5, respectively. PIP control unit 8 for controlling PIP screen size adjustment of down sampler 6 and 7, CPU 9 for controlling the demultiplexer 3 and PIP control unit 8 according to a user's key input Under the control of the PIP control unit 8, the outputs of the first and second down samplers 6 and 7 are mixed to obtain a PIP screen for the entire screen. Composed of the mixer 10, NTSC encoder 11 for encoding the output of the mixer 10 to the NTSC (National Television System Committee) signal.

According to the present invention configured as described above, the satellite broadcasting signal received from the satellite antenna 1 is decoded by the channel decoder 2 and output to the demultiplexer 3.

The demultiplexer 3 demultiplexes an input signal under the control of the CPU 9 and outputs the MPEG video / audio signal for each channel.

The output signal of each channel of the demultiplexer 3 is input to the first and second MPEG decoders 4 and 5 and decoded.

Here, the demultiplexer 3 demultiplexes only two necessary signals and outputs them to the first and second MPEG decoders 4 and 5, which are controlled by the CPU 9.

If the number of MPEG decoders is increased, the demultiplexer 3 outputs each channel signal as many as the number of MPEG decoders provided.

The output signals of the first and second MPEG decoders 4 and 5 are input to the first and second down samplers 7 and 8 and down sampled.

In this case, the first and second down samplers 6 and 7 downsample the input signal at a ratio of the PIP screen to the entire screen to be displayed on the screen under the control of the PIP controller 8 according to a user's request. .

For example, when the output signal of the first MPEG decoder 4 is the mother screen and the output signal of the second MPEG decoder 5 is the PIP screen, the ratio of the PIP screen to the mother screen according to the user's request is determined. As a result, the output signal of the second MPEG decoder 5 is down sampled by the second down sampler 7.

Here, under the control of the CPU 8, switching between the mother screen and the PIP screen is also possible immediately.

The output signals of the first and second danwoo samplers 6 and 7 are synthesized by the mixer 10 and finally output as an image in which the two screens are combined, and the output signal of the mixer 10 is an NTSC encoder 11. It is encoded by NTSC signal and output through.

As described above, the present invention can simultaneously watch two screens on a TV receiving a digital satellite broadcast signal, and also adjusts the ratio of the two screens.

Claims (1)

A channel decoder 2 which receives and decodes a satellite broadcast signal from the satellite antenna 1, and a demultiplexer which demultiplexes an output signal of the channel decoder 2 and outputs a video / audio signal for each channel ( 3) A digital satellite broadcasting receiving system comprising: Output signals of the first and second MPEG decoders 4 and 5, which decode the signals for each channel of the demultiplexer 3, and the first and second MPEG decoders 4 and 5. First and second down samplers 6 and 7 for adjusting the PIP screen size by adjusting; and a PIP controller for controlling the PIP screen size adjustment of the first and second down samplers 6 and 7; 8), the CPU 9 controlling the demultiplexer 3 and the PIP controller 8 according to a user's key input, and the first and second down according to the control of the PIP controller 8; A PIP device using a plurality of MPEG decoders, characterized by comprising a mixer 10 mixing the outputs of the samplers 6 and 7 to form a PIP screen for the entire screen.