KR100568316B1 - Integrated receiving system with out of band tuner - Google Patents

Abstract

The present invention is an integrated type having an OOB tuner integrated into one module to perform NTSC broadcasting, ATSC broadcasting (8-VSB) receiving, digital broadcasting (QAM) receiving and communication data receiving functions in one receiving system. The purpose is to provide a receiving system.

The integrated receiving system of the present invention includes: an RF circuit unit 100 for receiving and amplifying RF signals, including NTSC broadcasting, ATSC broadcasting, and digital cable broadcasting, and receiving and amplifying RF communication signals; An IB tuner 210 converts an RF broadcast signal from the RF circuit unit 100 into an intermediate frequency signal according to channel selection for each broadcast, and intermediates the RF communication signal from the RF circuit unit 100. A tuner unit 200 including an OOB tuner 240 for converting into a frequency signal; An IF circuit unit 300 for passing and amplifying the intermediate frequency signal from the IB tuner 210; And an NTSC demodulator 410 for demodulating the IF signal of the NTSC broadcast from the IF circuit unit 300, an 8-VBS demodulator 420 for demodulating the IF signal of the ATSC broadcast from the IF circuit unit 300, and A demodulator 400 including a QAM demodulator 430 for demodulating the IF signal of the digital cable broadcast from the IF circuit unit 300 and a QPSK demodulator 440 for demodulating the IF signal from the OOB tuner 240. Include.

NTSC broadcasting, ATSC broadcasting (8-VSB method), digital broadcasting (QAM method), data communication, IB tuner, OOB tuner, integrated receiving system

Description

INTEGRATED RECEIVING SYSTEM WITH OUT OF BAND TUNER}

1 is a schematic diagram of a conventional NTSC reception system.

2 is a schematic diagram of a conventional ATSC receiving system.

3 is a schematic diagram of a conventional cable receiving system.

4 is a block diagram of an integrated receiving system according to the present invention.

5 is a block diagram of an IB tuner according to the present invention.

Explanation of symbols on the main parts of the drawings

100: RF circuit section 110: high pass filter

120: RF AGC amplifier 130: RF AGC circuit

140: RF amplifier 200: tuner unit

210; IB tuner 211: variable band filter

212: RF amplifier 213: PLL

214: up converter 215: IF amplifier

216: Down Converter 240: OOB Tuner

300: IF circuit unit 310: first IF band pass filter

320: IF AGC amplifier 330: second IF bandpass filter

340: IF AGC circuit 400: demodulator

410: NTSC demodulator 420: 8-VBS demodulator

430: QAM demodulator 440; QPSK demodulator

The present invention relates to an integrated receiving system capable of receiving NTSC broadcasting, ATSC broadcasting, and digital cable broadcasting. In particular, the present invention relates to NTSC broadcasting, ATSC broadcasting (8-VSB system) reception, and digital broadcasting (QAM system). By integrating and implementing in one module to perform reception and communication data reception functions, a plurality of broadcasts can be received respectively, communication data can be received, and a tuner can be used to save charge space. An integrated receiving system with an OOB tuner.

At present, the Americas TV broadcasting is mixed with analog terrestrial broadcasting (NTSC system), digital terrestrial broadcasting (ATSC system), digital cable broadcasting (QAM system), and the like. Each receiver should be provided.

1 is a schematic diagram of a conventional NTSC reception system.

The NTSC (National Television Standards Committee) receiving system shown in FIG. 1 uses an analog color TV system, which converts an RF signal input through an antenna and outputs an intermediate frequency signal. 11) and an NTSC demodulator 12 for AM and FM demodulation of the signal from the NTSC tuner 11 to restore audio and video signals (A / V).

2 is a schematic diagram of a conventional ATSC receiving system.

The Advanced Television Standards Committee (ATSC) receiving system shown in FIG. 2 uses a digital TV system, which is a VSB (Vestigial Side Band) technology, which converts an RF signal input through an antenna and outputs an intermediate frequency signal. An ATSC tuner 21 for selecting a channel and an 8-VSB demodulator 22 for demodulating the signal from the ATSC tuner 21 in an 8-VSB scheme to output a transport stream TS.

3 is a schematic diagram of a conventional cable receiving system.

The cable receiving system shown in FIG. 3 uses a QAM (Quadrature Amplitude Modulation) scheme, which converts an RF signal input through an optical cable and selects a desired channel in the process of outputting an intermediate frequency signal. A tuner 31 and a QAM demodulator 32 for demodulating the signal from the digital cable tuner 31 in a QAM manner and outputting a transport stream TS.

However, conventionally, in order to receive analog terrestrial broadcasting (NTSC system), digital terrestrial broadcasting (ATSC system), and digital cable broadcasting (QAM system), respectively, a dedicated receiver must be provided, respectively, so that a purchase cost burden is on the consumer. There is a weighted problem.

The present invention has been proposed to solve the above problems, and its purpose is to perform NTSC broadcast reception, ATSC broadcast (8-VSB method) reception, digital broadcast (QAM method) reception and communication data reception functions in one reception system. By integrating and implementing in one module, an integrated receiving system having an OOB tuner capable of receiving a plurality of broadcasts, receiving communication data, and using a single tuner can save charge space. To provide.

In order to achieve the above object of the present invention, the integrated receiving system having an OOB tuner of the present invention,

An RF circuit unit for receiving and amplifying an RF broadcast signal including NTSC broadcast, ATSC broadcast, and digital cable broadcast, and receiving and amplifying an RF communication signal;

An IB tuner for converting an RF broadcast signal from the RF circuit unit into an intermediate frequency signal according to channel selection for each broadcast, and an OOB tuner for converting an RF communication signal from the RF circuit unit into an intermediate frequency signal. A tuner section;

An IF circuit section for passing and amplifying the intermediate frequency signal from the IB tuner; And

An NTSC demodulator for demodulating the IF signal of the NTSC broadcast from the IF circuit section, an 8-VBS demodulator for demodulating the IF signal of the ATSC broadcast from the IF circuit section, and a IF signal for digital cable broadcasting from the IF circuit section; A demodulator including a QAM demodulator and a QPSK demodulator for demodulating an IF signal from the OOB tuner

Characterized in that it comprises a.

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

In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

4 is a block diagram of an integrated receiving system according to the present invention.

Referring to FIG. 4, an integrated receiving system according to the present invention includes an RF circuit unit that receives and amplifies an RF broadcast signal including NTSC broadcast, ATSC broadcast, and digital cable broadcast, and receives and amplifies an RF communication signal. 100), an IB tuner 210 for converting an RF broadcast signal from the RF circuit unit 100 into an intermediate frequency signal according to channel selection for each broadcast and selecting a channel, and an RF from the RF circuit unit 100. A tuner unit 200 including an OOB tuner 240 for converting a communication signal into an intermediate frequency signal, an IF circuit unit 300 for passing and amplifying an intermediate frequency signal from the IB tuner 210, and the IF circuit unit. NTSC demodulator 410 for demodulating the IF signal of NTSC broadcast from 300, 8-VBS demodulator 420 for demodulating the IF signal of ATSC broadcast from IF circuit section 300, and IF circuit section 300. Demodulate IF signal of digital cable broadcasting Includes a demodulator 400 including a QPSK demodulator 440 which demodulates the IF signal from a QAM demodulator 430 and the OOB tuner 240. The

The RF circuit unit 100 amplifies the high pass filter 110 which passes the input RF signal to a predetermined high frequency, and amplifies the RF signal from the high pass filter 110 with a gain determined according to the RF AGC voltage. RF AGC amplifier 120, RF AGC circuit 130 for outputting the RF AGC voltage to the RF AGC amplifier 120 according to the magnitude of the intermediate frequency signal of the IB tuner 210, and input RF communication signal And an RF amplifier 140 that amplifies with a preset gain.

5 is a block diagram of an IB tuner according to the present invention.

Referring to FIG. 5, the IB tuner 210 outputs a channel selection signal according to channel selection and a PLL 213 and an RF signal from the RF circuit unit 100 according to the channel selection signal of the PLL 213. An up-converter 214 for up-converting the broadcast signal into a primary intermediate frequency signal and selecting a channel; and a down-converting down-converted primary intermediate frequency signal from the up-converter 214 to a predetermined secondary intermediate frequency signal. It may include a converter 216.

Here, the secondary intermediate frequency signal corresponds to the intermediate frequency signal output from the IB tuner 210.

In addition, the IB tuner 210 includes a variable band filter 211 for passing the RF broadcast signal from the RF circuit unit 100 to a band varying according to channel selection, and a signal from the variable band filter 211. An RF amplifier 212 that amplifies with a gain determined according to the size, a PLL 213 for outputting a channel selection signal according to channel selection, and the RF amplifier 212 according to a channel selection signal of the PLL 213. An up-converter 214 for upconverting the signal from the up-converted signal to a first intermediate frequency signal and selecting a channel, and an IF amplifier 215 for amplifying the first intermediate frequency signal from the up-converter 214 with a predetermined gain. And a down converter 216 for down-converting the first intermediate frequency signal from the IF amplifier 215 to a preset second intermediate frequency signal.

The IF circuit unit 300 passes the intermediate frequency signal from the IB tuner 210 in a predetermined band and outputs the first IF bandpass filter 310 to the NTSC demodulator 410 and the IB tuner ( IF AGC amplifier 320 for amplifying the intermediate frequency signal from 210 with a gain determined according to the IF AGC voltage, and passing the intermediate frequency signal from the IF AGC amplifier 320 in a predetermined band to pass the 8-VBS. A second IF bandpass filter 330 output to the demodulator 420 and the QAM demodulator 430, respectively, and an IF AGC circuit for outputting the IF AGC voltage to the IF AGC amplifier 320 according to the magnitude of the intermediate frequency signal. 340.

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

The present invention includes one RF signal such as NTSC broadcasting, ATSC broadcasting (8-VSB method) and digital broadcasting (QAM method) included in approximately 54 MHz to 900 MHz, and data communication (QPSK) included in 70 MHz to 130 MHz. Receive processing may be performed in the integrated receiving system of FIG. 4, which will be described with reference to FIGS. 4 and 5.

4, in the integrated receiving system according to the present invention, first, the RF circuit unit 100 receives and passes and amplifies an RF broadcast signal of approximately 54 MHz to 900 MHz including NTSC broadcasting, ATSC broadcasting, and digital cable broadcasting. In addition, the RF communication signal is received and amplified and output to the tuner unit 200.

The RF circuit unit 100 will be described in detail. The high pass filter 110 of the RF circuit unit 100 passes the input RF signal through a preset high frequency band (eg, 54 MHz or higher). ) Subsequently, the RF AGC amplifier 120 amplifies the RF signal from the high pass filter 110 to a gain determined according to the RF AGC voltage and outputs the RF signal to the IB tuner 210 of the tuner unit 200.

At this time, the RF AGC circuit 130 of the RF circuit unit 100 outputs an RF AGC voltage to the RF AGC amplifier 120 according to the magnitude of the intermediate frequency signal of the IB tuner 210, and the RF AGC amplifier ( In 120, the gain is determined according to the RF AGC voltage.

The RF AGC circuit 130 and the RF AGC amplifier 120 can reduce the gain in the case of a strong electric field to prevent the amplifier from saturating and distorting the signal.

In addition, the RF amplifier 140 of the RF circuit unit 100 amplifies the input RF communication signal with a preset gain and outputs it to the OOB tuner 240 of the tuner unit 200.

Next, the IB tuner 210 of the tuner unit 200 converts the RF broadcast signal from the RF circuit unit 100 into an intermediate frequency signal (IF signal) of approximately 44 MHz according to channel selection for each broadcast. Then, the intermediate frequency signal is output to the IF circuit unit 300. In addition, the OOB tuner 240 of the tuner unit 200 converts the RF communication signal from the RF circuit unit 100 into an intermediate frequency signal of approximately 44 MHz, and outputs the intermediate frequency to the demodulator 400.

Referring to FIG. 5, the IB tuner 210 will be described in detail. The variable band pass filter 211 of the IB tuner 210 varies an RF broadcast signal from the RF circuit unit 100 according to channel selection. It passes through the band to be output to the RF amplifier 212, and the RF amplifier 212 amplifies the signal from the variable band filter 211 with a gain determined according to the size and outputs it to the up converter 214.

Meanwhile, the PLL 213 of the IB tuner 210 outputs a channel selection signal according to channel selection. Specifically, the PLL 213 outputs a channel selection signal for selecting a channel of the selected broadcast in response to the user's broadcasting and channel selection. The up converter 214 outputs the up converter 214 to select a frequency band corresponding to the channel selected by the user.

In the up-converter 214, an oscillation frequency is determined according to the channel selection signal of the PLL 213. The up-converter 214 uses the oscillation frequency to convert an RF signal from the RF amplifier 212 into a first intermediate frequency signal of approximately 1220 MHz ( Up-convert to the IF1 signal to select the channel.

Subsequently, the IF amplifier 215 of the IB tuner 210 amplifies the first intermediate frequency signal IF1 signal of approximately 1220 MHz from the up converter 214 to a preset gain and outputs it to the down converter 216. do.

Subsequently, the down converter 216 down-converts the approximately 1220 MHz primary intermediate frequency signal from the IF amplifier 215 to a secondary intermediate frequency signal of approximately 44 MHz using an internal oscillation frequency, thereby converting the IF circuit unit 300. )

Through the operation of the IB tuner 210, it is possible to select any broadcast channel among NTSC broadcast, ATSC broadcast (8-VSB method) and digital broadcast (QAM method) included in approximately 54 MHz to 900 MHz. Through this double tuning process, the interference and noise characteristics are improved by increasing the interval between the intermediate frequency and the RF frequency due to the characteristics of the double conversion.

At this time, the IF circuit unit 300 passes and amplifies the intermediate frequency signal from the IB tuner 210 and outputs the demodulation unit 400.

The IF circuit unit 300 will be described in detail. The first IF bandpass filter 310 of the IF circuit unit 300 passes the intermediate frequency signal from the IB tuner 210 in a predetermined band. Output to NTSC demodulator 410.

In addition, the IF AGC amplifier 320 of the IF circuit unit 300 amplifies the intermediate frequency signal from the IB tuner 210 with a gain determined according to the IF AGC voltage and outputs it to the second IF bandpass filter 330. .

Thereafter, the second IF bandpass filter 330 of the IF circuit unit 300 passes the intermediate frequency signal from the IF AGC amplifier 320 in a predetermined band so that the 8-VBS demodulator 420 and the QAM demodulator are passed. Output each to 430.

In this case, the IF AGC circuit 340 of the IF circuit unit 300 outputs an IF AGC voltage to the IF AGC amplifier 320 according to the magnitude of the intermediate frequency signal, so that the IF AGC amplifier 320 corresponds to the IF AGC voltage. The gain is then determined.

The IF AGC circuit 340 and the IF AGC amplifier 320 increase the gain in the case of a weak field to maintain sufficient reception sensitivity even in the weak field.

The NTSC demodulator 410 of the demodulator 400 then FM and AM demodulates the IF signal of the NTSC broadcast from the IF circuit unit 300 and outputs audio and video signals (A / V). The 8-VBS demodulator 420 of the demodulator 400 demodulates the IF signal of the ATSC broadcast from the IF circuit unit 300 by 8-VBS and outputs a transport stream TS. The QAM demodulator 430 of the demodulator 400 QAM demodulates the IF signal of the digital cable broadcast from the IF circuit unit 300 and outputs a transport stream TS.

In addition, the QPSK demodulator 440 of the demodulator 400 may demodulate the IF signal from the OOB tuner 240 to receive communication data.

As described above, the present invention can simultaneously receive terrestrial analog and digital broadcasts and cable broadcasts, and can receive and watch a desired broadcast channel among various broadcasts according to a user's selection if necessary in one reception system. In addition, it is possible to receive data from a broadcasting station.

According to the present invention as described above, NTSC broadcast, ATSC broadcast (8-VSB method) reception, digital broadcast (QAM method) reception, and the like in an integrated reception system capable of receiving NTSC broadcast, ATSC broadcast and digital cable broadcast. By integrating and implementing in one module to perform communication data receiving function, it is possible to receive a plurality of broadcasts individually, and also to receive communication data, and to use one tuner to save space. have.

Claims (5)

An RF circuit unit 100 which receives and amplifies an RF broadcast signal including NTSC broadcast, ATSC broadcast, and digital cable broadcast, and receives and amplifies an RF communication signal; An IB tuner 210 converts an RF broadcast signal from the RF circuit unit 100 into an intermediate frequency signal according to channel selection for each broadcast, and intermediates the RF communication signal from the RF circuit unit 100. A tuner unit 200 including an OOB tuner 240 for converting into a frequency signal; An IF circuit unit 300 for passing and amplifying the intermediate frequency signal from the IB tuner 210; And An NTSC demodulator 410 that demodulates an IF signal of NTSC broadcast from the IF circuit unit 300, an 8-VBS demodulator 420 that demodulates an IF signal of ATSC broadcast from the IF circuit unit 300, and the IF A demodulator 400 including a QAM demodulator 430 for demodulating the IF signal of the digital cable broadcasting from the circuit unit 300 and a QPSK demodulator 440 for demodulating the IF signal from the OOB tuner 240. Integrated receiving system having an OOB tuner comprising a. The method of claim 1, wherein the RF circuit unit 100 A high pass filter 110 for passing the input RF signal to a preset high frequency band; An RF AGC amplifier 120 for amplifying the RF signal from the high pass filter 110 with a gain determined according to an RF AGC voltage; An RF AGC circuit 130 for outputting an RF AGC voltage to the RF AGC amplifier 120 according to the magnitude of the intermediate frequency signal of the IB tuner 210; And RF amplifier 140 for amplifying the input RF communication signal with a predetermined gain Integrated receiving system having an OOB tuner comprising a. The method of claim 1, wherein the IB tuner 210 is PLL (213) for outputting channel selection signal according to channel selection An up converter (214) for upconverting the RF broadcast signal from the RF circuit unit (100) to a primary intermediate frequency signal according to the channel selection signal of the PLL (213) to select a channel; And A down converter 216 for down-converting the first intermediate frequency signal from the up converter 214 to a predetermined intermediate frequency signal Integrated receiving system having an OOB tuner comprising a. The method of claim 1, wherein the IB tuner 210 is A variable band filter (211) for passing the RF broadcast signal from the RF circuit unit (100) into a band which varies according to channel selection; An RF amplifier 212 that amplifies the signal from the variable band pass filter 211 with a gain determined according to its magnitude; PLL (213) for outputting channel selection signal according to channel selection An up-converter (214) for upconverting the signal from the RF amplifier (212) to a primary intermediate frequency signal according to the channel selection signal of the PLL (213) to select a channel; An IF amplifier 215 for amplifying the first intermediate frequency signal from the up converter 214 to a preset gain; And A down converter 216 for down-converting the first intermediate frequency signal from the IF amplifier 215 to a predetermined intermediate frequency signal Integrated receiving system having an OOB tuner comprising a. The method of claim 1, wherein the IF circuit unit 300 A first IF bandpass filter 310 which passes the intermediate frequency signal from the IB tuner 210 to a predetermined band and outputs the signal to the NTSC demodulator 410; An IF AGC amplifier 320 amplifying the intermediate frequency signal from the IB tuner 210 with a gain determined according to the IF AGC voltage; A second IF bandpass filter 330 which passes the intermediate frequency signal from the IF AGC amplifier 320 to a predetermined band and outputs the same to the 8-VBS demodulator 420 and the QAM demodulator 430, respectively; And An IF AGC circuit 340 for outputting an IF AGC voltage to the IF AGC amplifier 320 according to the magnitude of the intermediate frequency signal; Integrated receiving system having an OOB tuner comprising a.

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