KR100495223B1 - Satellite broadcast receiver for dual channel receiving - Google Patents

Abstract

The present invention is to provide a satellite broadcasting receiver for dual channel reception which can receive a plurality of broadcast signals simultaneously and reduce the number of parts and process them individually, thereby increasing the degree of freedom of design and miniaturization, the configuration is a low noise frequency converter A satellite broadcasting receiver which tunes a specific channel from a satellite broadcasting signal applied from a satellite broadcasting signal to a video / audio signal that can be watched on a television set, comprising: an input unit to which a satellite broadcasting signal input from the low noise frequency converter is input; A loop-through output unit for outputting the satellite broadcast signal as it is to the outside, a control signal input unit indicating whether to amplify operation, and an amplification to amplify a signal input through the input unit by operating according to a control signal applied from the control signal input unit And each of the broadcast signals output from the amplifier A first and second I / Q demodulator for demodulating a signal of a selected frequency into an I / Q signal, a first and second matching unit for matching a path between the amplifier and the first and second I / Q demodulators, A third matching unit for matching a path between the amplifying unit and the loop through output unit, and two demodulated analog broadcast signals inputted from the first and second I / Q demodulating units into digital signals, and then performing FEC demodulation. A tuner module including a dual FEC demodulator for outputting 1,2 data streams and a first and second data output part for outputting first and second data streams output from the dual FEC demodulator; And an MPEG IC which simultaneously receives the first and second data streams from the first and second data outputs of the tuner means and demodulates the video compression of each data stream to restore a video / audio signal that can be viewed on a television.

Description

Satellite broadcast receiver for dual channel receiving

The present invention relates to a dual channel receiver satellite broadcast receiver capable of simultaneously receiving and processing a plurality of broadcast signals.

A broadcast receiver is a device that receives a broadcast signal transmitted in a specific manner and demodulates it according to a corresponding format so that it can be viewed on a TV. The broadcast receiver receives a satellite broadcast signal transmitted through a satellite according to a broadcast method to be transmitted, A cable broadcast receiver that receives cable broadcast signals transmitted through a cable is connected to a television receiver and is also called a set top box because it is placed on top of a television.

Among them, the satellite broadcast signal is a digital broadcast signal transmitted in a digital form, and transmits various types of digital data including channel information and control information for broadcast reception, as well as video / audio video signals. Accordingly, the digital broadcasting receiver including the satellite broadcasting receiver tunes a channel signal of a specific frequency band among the satellite broadcasting signals and demodulates it into digital data, extracts data of the selected program from the demodulated data stream, and decompresses it. It will have a digital image processing function to restore the original video / audio data. In the above, MPEG technology is mainly used as a video compression technology.

In recent years, in accordance with complex and multifunctional components, the above-described tuner and demodulation functions are manufactured in one module, and digital processing functions such as decompression and restoration are integrated into one IC.

In addition, the current TV receiver includes a pair of signal processing circuits having the same configuration for processing two-channel signals transmitted through analog, and supports a PIP (Picture In Pincture) function and a double window function, and VTR (Video tape) In a video recording device such as a recorder, a pair of signal processing circuits having the same structure for processing two channel signals transmitted in analog are supported, and the PVR (Personal video record) function is supported. It is applied to the receiver.

In the above-described PIP function, a sub-screen is allocated to a part of the main screen to show two different channels at the same time, and the double window function divides one screen into two screens of the same size so that different channels can be simultaneously viewed. It is a function to record a channel different from the channel viewed by the VTR and the like for the PVR function.

1 shows a conventional configuration of a satellite broadcasting receiver supporting the above-described PIP, PVR, and double window functions, and the conventional satellite broadcasting receiver has a low noise frequency converter installed externally like a conventional TV receiver to support the above functions. A pair of tuners 11 and 12 having the same configuration for demodulating and receiving satellite broadcast signals of different channels transmitted from the LNB, respectively, and demodulating them into digital data, respectively, to provide two satellite broadcast signals of different channels, respectively. Selectively receive and transmit the data to the MPEG IC 12 through the respective data paths, and the MPEG processor 13 extracts and decompresses video / audio data from data streams of different channels respectively inputted through two paths. According to the instruction (control signal) of each of the screen to combine or output the recording or viewing for As a result, it is integrated into one IC and manufactured. In the above, the tuners 11 and 12 are manufactured and sold as one module, respectively, and input satellites 11a and 12a to which satellite broadcast signals are input and satellite broadcast signals input to the input terminals 11a and 12a. The loop-through output terminals 11a and 11b are output as they are, so that the input terminal 11a of the first tuner unit 11 is connected to the low noise frequency converter LNB, and the input of the second tuner unit 12 is input. The terminal 12a is connected to the loop through output terminal 11b of the first tuner unit 11 so that the satellite broadcast signals can be simultaneously applied to the first and second tuner units 11 and 12. The tuner sections 11 and 12 and the MPEG IC 13 are mounted on the main board of the set top box.

As described above, since a conventional tuner module having a function of simultaneously receiving different broadcast signals has not been proposed, as shown in FIG. 1, two tuner modules have to be mounted, which is a space limitation when designing a set-top box. And the like, and it is difficult to downsize by that amount.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-described problems, and its object is to reduce the number of parts and simultaneously receive and process a plurality of broadcast signals, so that the number of dual channels can be reduced in size and increase in design freedom. To provide a credit satellite broadcast receiver.

As a construction means for achieving the above object of the present invention, the present invention is a satellite broadcast receiver for reconstructing a specific channel from a satellite broadcast signal applied from a low noise frequency converter to a video / audio signal that can be viewed in a television set, An input unit to which the satellite broadcast signal input from the low noise frequency converter is input, a loop through output unit to output the satellite broadcast signal input to the input unit as it is, a control signal input unit to indicate whether the amplification operation is performed, and the control signal An amplifying unit for amplifying a signal input through the input unit by operating in accordance with a control signal applied from the input unit, and first and second I demodulating signals of respective selected frequencies among the broadcast signals output from the amplifying unit into I / Q signals. First and second matching units for matching paths between the / Q demodulator and the amplification unit and the first and second I / Q demodulators; A third matching unit for matching a path between the unit and the loop through output unit, and two demodulated analog broadcast signals respectively inputted from the first and second I / Q demodulators into digital signals, and then performing FEC demodulation. A tuner module including a dual FEC demodulator for outputting two data streams and a first and second data output unit for outputting first and second data streams output from the dual FEC demodulator; And

And an MPEG IC which simultaneously receives the first and second data streams from the first and second data outputs of the tuner means and demodulates the video compression of each data stream to restore a video / audio signal that can be viewed on a television. By such a configuration, the number of tuner modules is reduced to one, thereby solving the space constraints in manufacturing the set-top box, and providing an effect of enabling miniaturization.

In addition, the satellite broadcasting receiver according to the present invention simplifies the data line by implementing one of the first and second data output units of the tuner module in parallel and the other in serial.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the satellite broadcast receiver according to the present invention.

FIG. 2 is a schematic functional block diagram of a satellite broadcast receiver according to the present invention, and receives satellite broadcast signals from a low noise block (LNB) included in a satellite reception antenna (not shown) to broadcast different channels. The tuner module 21 simultaneously tunes the signal and demodulates the digital data and outputs the data along the respective data lines, and decompresses the two data streams input from the tuner module 21 through different paths, respectively. It is composed of MPEG IC 22 which restores to a viewable signal and performs PIP, PVR, and double window functions.

As shown in FIG. 3, the tuner module 21 is configured such that the satellite broadcasting signal inputted from the low noise frequency converter is input to the input unit 21a and the satellite broadcasting signal inputted to the input unit 21a. Amplifying and outputting a signal input through the input unit in accordance with a loop-through output unit 21b for outputting a signal, a control signal input unit 21l for instructing amplification operation, and a control signal applied from the control signal input unit 21l, or An amplifier 21c for outputting as it is, an I / Q demodulator 21g, 21h for demodulating a signal of a selected frequency among the broadcast signals output from the amplifier 21c into an I / Q signal, and the amplifier Matching parts 21d and 21f for matching paths between 21c and I / Q demodulation parts 21g and 21h, and third matching for matching paths between amplifying part 21c and loop-through output part 21b. Two demodulated analog inputs from the unit 21e and the I / Q demodulators 21g and 21h, respectively. A dual FEC demodulator 21i for converting a broadcast signal into a digital signal and then demodulating the FEC to output a data stream, and a data output unit 21j for outputting two data streams output from the dual FEC demodulator 21i. , 21k).

Referring to the operation of the satellite broadcasting receiver of the present invention configured as described above, first, the broadcast signal input to the input unit 21a of the tuner module 21 is amplified by the amplifier 21c, and then transmitted through three paths. First, it is output to the loop-through output unit 21b through the matching unit 21e. At this time, the attenuation in the path where the satellite broadcast signal is input to the input unit 21a and output to the loopthrough output unit 21b compensates for the attenuated portion by amplifying the satellite broadcast signal input from the amplifier 21c in advance.

At the same time, the satellite broadcast signal output from the amplifier 21c is input to the I / Q demodulators 21g and 21h through the matching units 21d and 21f. The two I / Q demodulators 21g and 21h select broadcast signals of respective set frequency bands from the input satellite broadcast signals and demodulate them into low frequency I / Q signals. That is, the two I / Q signals output from the two I / Q demodulators 21g and 21h become signals of different channels.

As described above, two I / Q signals output from the I / Q demodulators 21g and 21h are input to the dual FEC demodulator 21i along respective signal lines.

The dual FEC demodulator 21i includes a pair of digital processing means for converting and decoding an input I / Q signal into a digital signal and correcting an error included in the signal. The two I / Q demodulators 21g, Two I / Q signals applied from 21h) are digitally converted, decoded and error corrected, respectively, and output through the data output units 21j and 21k, respectively.

Here, the two data output units 21j and 21k are configured to output digital data in parallel, one of which consists of a plurality of pins, and the other to output data in a serial manner through one data port. As a result, the number of pins for outputting data can be minimized, and as a result, a problem of space limitation due to an increase in the number of pins can be solved.

The two data output units 21j and 21k are input together to the MPEG IC 22 through respective data lines as shown in FIG. 2, and the MPEG IC 22 respectively inputs the two input data streams. Decompresses and restores the video / audio signal for viewing on a television.

If necessary, the restored two video / audio signals may be combined into one screen in the form of PIP or double window and output for recording or viewing.

If necessary, another signal, which is provided separately for viewing on a television, may be output to a video recording apparatus or other external device for recording.

According to the above description, the present invention enables to receive and process two different broadcast signals with one tuner module, thereby minimizing a satellite broadcast receiver having a PIP, PVR, or double window function, thereby improving space limitation of the set-top box. It can have an excellent effect.

1 is a functional block diagram of a conventional satellite broadcast receiver.

2 is a functional block diagram of a satellite broadcast receiver according to the present invention.

3 is a block diagram of a tuner module provided in the satellite broadcasting receiver according to the present invention.

<Description of Symbols for Main Parts of Drawings>

21: tuner module 22: MPEG module

21a: input section 21b: loop-through output section

21c: amplifier 21d ~ 21f: matching section

21g, 21h: 1st, 2nd I / Q demodulator 21i: Dual FEC demodulator

21j: First data output section 21k: Second data output section

21l: control signal input unit

Claims (2)

In a satellite broadcasting receiver which tunes a specific channel from a satellite broadcasting signal applied from a low noise frequency converter to a video / audio signal that can be viewed on a television set. An input unit to which the satellite broadcast signal input from the low noise frequency converter is input, a loop through output unit to output the satellite broadcast signal input to the input unit as it is, a control signal input unit to indicate whether the amplification operation is performed, and the control signal An amplifying unit for amplifying a signal input through the input unit by operating according to a control signal applied from the input unit, and first and second I demodulating signals of respective selected frequencies among the broadcast signals output from the amplifying unit into I / Q signals. A first / second matching unit for matching a path between the / Q demodulation unit, the amplifier and the first and second I / Q demodulation unit, and a third matching unit for matching the path between the amplifying unit and the loop-through output unit; A dual FEC demodulator for converting two demodulated analog broadcast signals respectively input from the first and second I / Q demodulators into digital signals and then performing FEC demodulation to output first and second data streams; A tuner module including first and second data output parts for outputting first and second data streams output from an EC demodulator; And MPEG IC which receives the first and second data streams simultaneously from the first and second data outputs of the tuner means and demodulates the video compression of each data stream to a video / audio signal that can be viewed on a television. Dual channel receiving satellite broadcasting receiver comprising a. The satellite broadcasting receiver of claim 1, wherein one of the first and second data output units of the tuner module is implemented in parallel and the other in serial.