WO2010050696A2 - Broadcast receiving system and control method thereof - Google Patents

Broadcast receiving system and control method thereof Download PDF

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Publication number
WO2010050696A2
WO2010050696A2 PCT/KR2009/006122 KR2009006122W WO2010050696A2 WO 2010050696 A2 WO2010050696 A2 WO 2010050696A2 KR 2009006122 W KR2009006122 W KR 2009006122W WO 2010050696 A2 WO2010050696 A2 WO 2010050696A2
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Prior art keywords
frequency signal
digital
saw filter
analog
band
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PCT/KR2009/006122
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French (fr)
Korean (ko)
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WO2010050696A3 (en
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최석동
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엘지이노텍주식회사
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Priority to CN2009801478200A priority Critical patent/CN102227906A/en
Publication of WO2010050696A2 publication Critical patent/WO2010050696A2/en
Publication of WO2010050696A3 publication Critical patent/WO2010050696A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation

Definitions

  • An embodiment relates to a broadcast receiving system and a control method thereof.
  • the broadcast receiving system may include an analog / digital tuner for receiving both analog broadcast and digital broadcast.
  • the analog / digital tuner includes a digital saw (SAW) filter for passing a signal of an input digital broadcasting frequency band, and an analog saw (SAW) filter for passing an analog broadcasting frequency band.
  • SAW digital saw
  • SAW analog saw
  • the conventional broadcast receiving system uses only the digital saw filter when receiving digital broadcast, and uses only the analog saw filter when receiving analog broadcast.
  • the embodiment provides a broadcast receiving system and a control method thereof for improving analog broadcast receiving efficiency in a reception environment in which analog broadcast signals and digital broadcast signals are mixed.
  • a broadcast receiving system includes: an intermediate frequency circuit unit for outputting a high frequency signal received through an antenna by tuning to an intermediate frequency signal; A first saw filter for passing only a band of the digital broadcast frequency signal from the intermediate frequency signal output from the intermediate frequency circuit part; A digital amplifier amplifying the digital broadcast frequency signal attenuated by the first saw filter; A second saw filter for passing only a band of an analog broadcast frequency signal in the digital broadcast frequency signal amplified by the digital amplifier; And an analog demodulator configured to demodulate and output the analog broadcast frequency signal filtered by the second saw filter.
  • a control method of a broadcast receiving system includes: tuning and outputting a high frequency signal received through an antenna into an intermediate frequency signal; Passing a band of a digital broadcast frequency signal from the intermediate frequency signal; Amplifying the intermediate frequency signal of the digital broadcast frequency signal band; Passing a band of an analog broadcast frequency signal from the amplified intermediate frequency signal of the digital broadcast frequency signal band; And demodulating and outputting the analog broadcast frequency signal.
  • the embodiment it is possible to provide a broadcast receiving system and a control method thereof for improving analog broadcast receiving efficiency in a reception environment in which analog broadcast signals and digital broadcast signals are mixed.
  • FIG. 1 is a control block diagram of a broadcast receiving system according to an embodiment.
  • FIG. 2 is a control flowchart of a broadcast receiving system according to an embodiment.
  • FIG. 1 is a control block diagram of a broadcast receiving system according to an embodiment.
  • an analog / digital tuner is applied to the intermediate frequency circuit unit 100, the first saw filter 200, the digital amplifier 300, and the digital demodulator 500. ), A second saw filter 400 and an analog demodulation unit 600.
  • the intermediate frequency circuit unit 100 may tune and output the high frequency signal received from the antenna as the intermediate frequency signal.
  • the intermediate frequency circuit unit 100 may convert a high frequency signal received from an antenna into an intermediate frequency signal corresponding to a desired broadcast channel and output the converted high frequency signal.
  • the intermediate frequency circuit unit 100 may include an MO PLL (Mixer and Oscillator Phase-locked loop) chip.
  • the first SAW filter 200 may pass only a specific band in the intermediate frequency signal output from the intermediate frequency circuit unit 100.
  • the first SAW filter 200 may be a digital SAW filter.
  • the first SAW filter 200 of the broadcast reception system may have a bandwidth of 8 MHz.
  • Conventional digital SAW filters are used by switching 7/8 MHz. Accordingly, the conventional digital SAW filter can pass and output only a digital broadcast frequency signal.
  • the embodiment by applying the first SAW filter 200 having the 8 MHz bandwidth, not only the digital broadcast frequency signal but also the analog broadcast frequency signal can be passed.
  • the digital amplifier 300 may amplify and compensate the attenuated signal output from the first SAW filter 200. Since the digital amplifier 300 has a large gain, the digital amplifier 300 may be amplified more than the amount attenuated by the first SAW filter 200. Accordingly, the digital demodulator 500 may include an auto gain control (AGC) of the intermediate frequency signal in order to amplify the attenuated amount, thereby outputting a constant voltage.
  • AGC auto gain control
  • the digital demodulator 500 may demodulate and output the digital broadcast frequency signal amplified and output from the digital amplifier 300 into a desired digital audio / video signal.
  • the second SAW filter 400 may pass only a predetermined band in the digital broadcast frequency signal amplified and output by the digital IF 300.
  • the second SAW filter 400 may be an analog SAW filter.
  • the analog SAW filter may pass the band of the analog broadcast frequency signal from the digital broadcast frequency signal amplified by the digital amplifier 300 and output.
  • the analog demodulator 600 may demodulate and output the analog broadcast frequency signal filtered by the second SAW filter 400. In this case, the analog demodulator 600 may demodulate and output an analog broadcast frequency signal into a desired analog audio / video signal.
  • the control flow of the broadcast system according to the embodiment including such a configuration is as shown in FIG. 2.
  • FIG. 2 is a control flowchart of a broadcast receiving system according to an embodiment.
  • the broadcast receiving system receives an analog broadcast signal through an antenna and converts it into an intermediate frequency signal of a desired channel (S100).
  • the high frequency analog broadcast signal input from the antenna is converted into an intermediate frequency signal of a desired channel through the intermediate frequency circuit unit 100 and output.
  • the converted analog broadcast signal is filtered using a first SAW filter 200 which is a digital saw filter (S120).
  • a first SAW filter 200 which is a digital saw filter (S120).
  • the band of the digital broadcast frequency signal is filtered through a first SAW filter 200.
  • the first SAW filter 200 has a bandwidth of at least 8 MHz. Therefore, although the first saw filter is a digital saw filter, it can also pass an analog broadcast frequency signal having a large bandwidth.
  • the signal of the filtered digital broadcast frequency signal band is amplified by the digital amplifier 300 (S140). Accordingly, the input loss due to the first SAW filter 200 is compensated.
  • the signal of the amplified output digital broadcasting frequency signal band is filtered by a second SAW filter 400 (S160). Only the band of the analog broadcast frequency signal may be extracted by the second SAW filter 400 as the signal of the band of the digital broadcast frequency signal output from the digital IF Amp 300.
  • S160 SAW filter 400
  • the extracted analog broadcast frequency signal is demodulated by the analog demodulator 600 (S180).
  • the analog broadcast frequency signal output from the second SAW filter 400 is transmitted to the analog demodulator 600 and demodulated into an analog audio / video signal.
  • the broadcast reception system does not directly input the intermediate frequency signal output from the intermediate frequency circuit unit 100 to the second SAW filter 400, but instead uses the first SAW filter. , 200 to attenuate adjacent signals. Thereafter, a digital amplifier 300 is passed to compensate for insertion loss generated by the first SAW filter 200. Thereafter, the analog SAW signal is extracted by passing through the second SAW filter 200. Accordingly, when the intermediate frequency signal output from the intermediate frequency circuit unit 100 is directly input to the second SAW filter 400, analog performance may be satisfied.
  • It can be used for digital broadcast receivers.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

One embodiment of the present invention relates to a broadcast receiving system and to a control method thereof. The broadcast receiving system comprises an intermediate frequency circuit unit which tunes the high frequency signal output through an antenna to an intermediate frequency signal, and outputs the intermediate frequency signal, a first SAW filter which enables only the band of a digital broadcast frequency signal from among the intermediate frequency signal output from the intermediate frequency circuit unit to pass, a digital amplifier which amplifies the digital broadcast frequency signal attenuated by the first SAW filter, a second SAW filter which enables only the band of an analog broadcast frequency signal from among the digital broadcast frequency signal amplified by the digital amplifier to pass; and an analog demodulation unit which demodulates the analog broadcast frequency signal filtered by the second SAW filter, and outputs the demodulated signal.

Description

방송수신 시스템 및 그 제어방법Broadcast receiving system and control method
실시 예는 방송수신 시스템 및 그 제어방법에 관한 것이다.An embodiment relates to a broadcast receiving system and a control method thereof.
방송수신 시스템은 아날로그 방송과 디지털 방송을 모두 수신하기 위해 아날로그/디지털 튜너를 포함할 수 있다.The broadcast receiving system may include an analog / digital tuner for receiving both analog broadcast and digital broadcast.
아날로그/디지털 튜너는 입력되는 디지털 방송 주파수 대역의 신호를 통과시키는 디지털 소우(SAW)필터와, 아날로그 방송주파수 대역을 통과시키는 아날로그 소우(SAW)필터를 포함한다.The analog / digital tuner includes a digital saw (SAW) filter for passing a signal of an input digital broadcasting frequency band, and an analog saw (SAW) filter for passing an analog broadcasting frequency band.
이에, 종래의 방송수신 시스템은 디지털 방송을 수신하는 경우 디지털 소우필터만을 사용하고, 아날로그 방송을 수신하는 경우 아날로그 소우필터만을 사용한다. Thus, the conventional broadcast receiving system uses only the digital saw filter when receiving digital broadcast, and uses only the analog saw filter when receiving analog broadcast.
실시 예는 아날로그 방송신호와 디지털 방송신호가 혼재되어 있는 수신환경에서 아날로그 방송수신 효율을 향상시키는 방송수신 시스템 및 그 제어방법을 제공한다. The embodiment provides a broadcast receiving system and a control method thereof for improving analog broadcast receiving efficiency in a reception environment in which analog broadcast signals and digital broadcast signals are mixed.
실시 예에 따른 방송수신 시스템은, 안테나를 통해 수신되는 고주파 신호를 중간주파 신호로 동조하여 출력하는 중간주파 회로부; 상기 중간주파 회로부에서 출력되는 중간주파 신호에서 디지털 방송주파 신호의 대역만을 통과시키는 제1 소우필터; 상기 제1 소우필터에서 감쇄된 상기 디지털 방송주파 신호를 증폭하는 디지털 증폭기; 상기 디지털 증폭기에서 증폭된 상기 디지털 방송주파 신호에서 아날로그 방송주파 신호의 대역만을 통과시키는 제2 소우필터; 및 상기 제2 소우필터에서 필터링된 상기 아날로그 방송주파 신호를 복조하여 출력하는 아날로그 복조부를 포함한다.According to an embodiment, a broadcast receiving system includes: an intermediate frequency circuit unit for outputting a high frequency signal received through an antenna by tuning to an intermediate frequency signal; A first saw filter for passing only a band of the digital broadcast frequency signal from the intermediate frequency signal output from the intermediate frequency circuit part; A digital amplifier amplifying the digital broadcast frequency signal attenuated by the first saw filter; A second saw filter for passing only a band of an analog broadcast frequency signal in the digital broadcast frequency signal amplified by the digital amplifier; And an analog demodulator configured to demodulate and output the analog broadcast frequency signal filtered by the second saw filter.
실시 예에 따른 방송수신 시스템의 제어방법은, 안테나를 통해 수신되는 고주파 신호를 중간주파 신호로 동조하여 출력하는 단계; 상기 중간주파 신호에서 디지털 방송주파 신호의 대역을 통과시키는 단계; 상기 디지털 방송주파 신호 대역의 중간주파 신호를 증폭하는 단계; 상기 증폭된 상기 디지털 방송주파 신호 대역의 중간주파 신호에서 아날로그 방송주파 신호의 대역을 통과시키는 단계; 및 상기 아날로그 방송주파 신호를 복조하여 출력하는 단계를 포함한다.A control method of a broadcast receiving system according to an embodiment includes: tuning and outputting a high frequency signal received through an antenna into an intermediate frequency signal; Passing a band of a digital broadcast frequency signal from the intermediate frequency signal; Amplifying the intermediate frequency signal of the digital broadcast frequency signal band; Passing a band of an analog broadcast frequency signal from the amplified intermediate frequency signal of the digital broadcast frequency signal band; And demodulating and outputting the analog broadcast frequency signal.
실시 예에 의하면, 아날로그 방송신호와 디지털 방송신호가 혼재되어 있는 수신환경에서 아날로그 방송수신 효율을 향상시키는 방송수신 시스템 및 그 제어방법을 제공할 수 있다.According to the embodiment, it is possible to provide a broadcast receiving system and a control method thereof for improving analog broadcast receiving efficiency in a reception environment in which analog broadcast signals and digital broadcast signals are mixed.
도 1은 실시 예에 따른 방송수신 시스템의 제어블럭도이다.1 is a control block diagram of a broadcast receiving system according to an embodiment.
도 2는 실시 예에 따른 방송수신 시스템의 제어 흐름도이다.2 is a control flowchart of a broadcast receiving system according to an embodiment.
이하에서는 첨부한 도면을 참조하여 실시예에 따른 방송수신 시스템 및 그 제어방법에 대해서 상세하게 설명한다. Hereinafter, a broadcast receiving system and a control method thereof according to an embodiment will be described in detail with reference to the accompanying drawings.
도 1은 실시 예에 따른 방송수신 시스템의 제어블럭도이다.1 is a control block diagram of a broadcast receiving system according to an embodiment.
도 1에 도시된 바와 같이, 실시예에 따른 방송수신 시스템은 아날로그/디지털튜너가 적용되어, 중간주파 회로부(100), 제1 소우필터(200), 디지털 증폭기(300), 디지털 복조부(500), 제2 소우필터(400) 및 아날로그 복조부(600)를 포함한다. As shown in FIG. 1, in the broadcast reception system according to the embodiment, an analog / digital tuner is applied to the intermediate frequency circuit unit 100, the first saw filter 200, the digital amplifier 300, and the digital demodulator 500. ), A second saw filter 400 and an analog demodulation unit 600.
중간주파 회로부(100)는 안테나로부터 수신된 고주파신호를 중간주파 신호로 동조하여 출력할 수 있다. 중간주파 회로부(100)는 안테나로부터 수신된 고주파신호를 원하는 방송채널에 해당하는 중간주파 신호로 변환하여 출력할 수 있다. 중간주파 회로부(100)는 MO PLL(Mixer and Oscillator Phase-locked loop) 칩 등을 포함하여 구성될 수 있다.The intermediate frequency circuit unit 100 may tune and output the high frequency signal received from the antenna as the intermediate frequency signal. The intermediate frequency circuit unit 100 may convert a high frequency signal received from an antenna into an intermediate frequency signal corresponding to a desired broadcast channel and output the converted high frequency signal. The intermediate frequency circuit unit 100 may include an MO PLL (Mixer and Oscillator Phase-locked loop) chip.
제1 소우필터(First SAW Filter, 200)는 중간주파 회로부(100)로부터 출력되는 중간주파 신호에서 특정 대역만을 통과시킬 수 있다. 이때, 제1 소우필터(First SAW Filter, 200)는 디지털 소우 필터(Digital SAW Filter)일 수 있다. The first SAW filter 200 may pass only a specific band in the intermediate frequency signal output from the intermediate frequency circuit unit 100. In this case, the first SAW filter 200 may be a digital SAW filter.
여기서, 실시예에 따른 방송수신 시스템의 제1 소우필터(First SAW Filter, 200)는 8MHz의 대역폭을 가질 수 있다. 종래의 디지털 소우필터(Digital SAW Filter)는 7/8 MHz를 스위칭해서 사용하였다. 이에, 종래의 디지털 소우 필터(Digital SAW Filter)는 디지털 방송주파 신호만을 통과하여 출력할 수 있었다. 이에 반해, 실시예에서는 8MHz 대역폭을 갖는 제1 소우필터(First SAW Filter, 200)를 적용함으로써, 디지털 방송주파 신호뿐만 아니라 아날로그 방송주파 신호도 통과시킬 수 있다.Here, the first SAW filter 200 of the broadcast reception system according to the embodiment may have a bandwidth of 8 MHz. Conventional digital SAW filters are used by switching 7/8 MHz. Accordingly, the conventional digital SAW filter can pass and output only a digital broadcast frequency signal. In contrast, in the embodiment, by applying the first SAW filter 200 having the 8 MHz bandwidth, not only the digital broadcast frequency signal but also the analog broadcast frequency signal can be passed.
디지털 증폭기(Digital IF Amp, 300)는 제1 소우필터(First SAW Filter, 200)에서 출력되는 감쇄된 신호를 증폭하여 보상할 수 있다. 디지털 증폭기(Digital IF Amp, 300)는 게인(Gain)이 크기 때문에 제1 소우필터(First SAW Filter, 200)에서 감쇠된 양보다 크게 증폭이 될 수 있다. 이에 따라, 감쇠된 양만큼 증폭이 될 수 있도록 디지털 복조부(Digital Demodulator, 500)에서 중간주파 신호의 오토 게인 컨트롤(AGC: Auto Gain Control)를 포함함으로써, 일정한 전압을 출력할 수 있다. The digital amplifier 300 may amplify and compensate the attenuated signal output from the first SAW filter 200. Since the digital amplifier 300 has a large gain, the digital amplifier 300 may be amplified more than the amount attenuated by the first SAW filter 200. Accordingly, the digital demodulator 500 may include an auto gain control (AGC) of the intermediate frequency signal in order to amplify the attenuated amount, thereby outputting a constant voltage.
디지털 복조부(Digital Demodulator, 500)는 디지털 증폭기(Digital IF Amp, 300)에서 증폭되어 출력되는 디지털 방송주파 신호를 원하는 디지털 오디오/비디오신호로 복조하여 출력할 수 있다.The digital demodulator 500 may demodulate and output the digital broadcast frequency signal amplified and output from the digital amplifier 300 into a desired digital audio / video signal.
제2 소우필터(Second SAW Filter, 400)는 디지털 증폭기(Digital IF Amp, 300)에서 증폭되어 출력되는 디지털 방송주파 신호에서 소정의 대역만을 통과시킬 수 있다. 이때 제2 소우필터(Second SAW Filter, 400)는 아날로그 소우필터(Analog SAW Filter)일 수 있다. 이에 따라, 아날로그 소우필터(Analog SAW Filter)는 디지털 증폭기(Digital IF Amp, 300)에서 증폭되어 출력되는 디지털 방송주파 신호에서 아날로그 방송주파 신호의 대역만 통과시켜 출력할 수 있다.The second SAW filter 400 may pass only a predetermined band in the digital broadcast frequency signal amplified and output by the digital IF 300. In this case, the second SAW filter 400 may be an analog SAW filter. Accordingly, the analog SAW filter may pass the band of the analog broadcast frequency signal from the digital broadcast frequency signal amplified by the digital amplifier 300 and output.
아날로그 복조부(Analog Demodulator, 600)는 제2 소우필터(Second SAW Filter, 400)에서 필터링된 아날로그 방송주파 신호를 복조하여 출력할 수 있다. 이때, 아날로그 복조부(Analog Demodulator, 600)는 아날로그 방송주파 신호를 원하는 아날로그 오디오/비디오신호로 복조하여 출력할 수 있다.The analog demodulator 600 may demodulate and output the analog broadcast frequency signal filtered by the second SAW filter 400. In this case, the analog demodulator 600 may demodulate and output an analog broadcast frequency signal into a desired analog audio / video signal.
이러한 구성을 포함하는 실시예에 따른 방송시스템의 제어 흐름은 도 2에 도시된 바와 같다.The control flow of the broadcast system according to the embodiment including such a configuration is as shown in FIG. 2.
도 2는 실시 예에 따른 방송수신 시스템의 제어 흐름도이다.2 is a control flowchart of a broadcast receiving system according to an embodiment.
방송수신 시스템은 안테나를 통해 아날로그 방송신호를 수신하여 원하는 채널의 중간주파 신호로 변환한다(S100). 안테나로부터 입력되는 고주파 아날로그 방송신호는 중간주파 회로부(100)를 통해서 원하는 채널의 중간주파 신호로 변환하여 출력된다.The broadcast receiving system receives an analog broadcast signal through an antenna and converts it into an intermediate frequency signal of a desired channel (S100). The high frequency analog broadcast signal input from the antenna is converted into an intermediate frequency signal of a desired channel through the intermediate frequency circuit unit 100 and output.
변환된 아날로그 방송신호를 디지털 소우필터인 제1 소우필터(First SAW Filter, 200)로 필터링 한다(S120). 중간주파 회로부(100)에서 출력된 중간주파 신호는 제1 소우필터(First SAW Filter, 200)를 통해 디지털 방송주파 신호의 대역이 필터링된다. 여기서, 제1 소우필터(First SAW Filter, 200)는 적어도 8MHz의 대역폭을 갖는다. 따라서, 제1 소우필터는 디지털 소우필터이기는 하지만, 대역폭이 큰 아날로그 방송주파 신호도 통과시킬 수 있다. The converted analog broadcast signal is filtered using a first SAW filter 200 which is a digital saw filter (S120). In the intermediate frequency signal output from the intermediate frequency circuit unit 100, the band of the digital broadcast frequency signal is filtered through a first SAW filter 200. Here, the first SAW filter 200 has a bandwidth of at least 8 MHz. Therefore, although the first saw filter is a digital saw filter, it can also pass an analog broadcast frequency signal having a large bandwidth.
필터링된 디지털 방송주파 신호 대역의 신호는 디지털 증폭기(300)를 통해 증폭된다(S140). 이에, 제1 소우필터(First SAW Filter, 200)로 인한 입력손실(Insertion Loss)이 보상된다.The signal of the filtered digital broadcast frequency signal band is amplified by the digital amplifier 300 (S140). Accordingly, the input loss due to the first SAW filter 200 is compensated.
증폭 출력된 디지털 방송주파 신호 대역의 신호를 제2 소우필터(Second SAW Filter, 400)로 필터링한다(S160). 디지털 증폭기(Digital IF Amp, 300)로부터 출력된 디지털 방송주파 신호의 대역의 신호는 제2 소우필터(Second SAW Filter, 400)에서 아날로그 방송주파 신호의 대역만 추출될 수 있다.The signal of the amplified output digital broadcasting frequency signal band is filtered by a second SAW filter 400 (S160). Only the band of the analog broadcast frequency signal may be extracted by the second SAW filter 400 as the signal of the band of the digital broadcast frequency signal output from the digital IF Amp 300.
추출된 아날로그 방송주파 신호를 아날로그 복조부(600)에서 복조한다(S180). 제2 소우필터(Second SAW Filter, 400)에서 출력된 아날로그 방송주파 신호는 아날로그 복조부(Analog Demodulator, 600)로 전달되어 아날로그 오디오/비디오신호로 복조된다.The extracted analog broadcast frequency signal is demodulated by the analog demodulator 600 (S180). The analog broadcast frequency signal output from the second SAW filter 400 is transmitted to the analog demodulator 600 and demodulated into an analog audio / video signal.
이와 같이, 실시예에 따른 방송수신 시스템은, 중간주파 회로부(100)에서 출력되는 중간주파 신호를 바로 제2 소우필터(Second SAW Filter, 400)로 입력하지 않고, 제1 소우필터(First SAW Filter, 200)를 통과시켜 인접 신호를 감쇄시킨다. 이 후, 제1 소우필터(First SAW Filter, 200)에서 발생되는 Insertion Loss를 보상하기 위해 디지털 증폭기(Digital IF Amp, 300)를 통과시킨다. 이후, 제2 소우필터(Second SAW Filter, 200)를 통과시켜 아날로그 방송주파 신호를 추출한다. 이에 따라, 중간주파 회로부(100)에서 출력되는 중간주파 신호를 바로 제2 소우필터(Second SAW Filter, 400)로 입력할 때 보다 아날로그 규격 성능을 만족할 수 있다.As described above, the broadcast reception system according to the embodiment does not directly input the intermediate frequency signal output from the intermediate frequency circuit unit 100 to the second SAW filter 400, but instead uses the first SAW filter. , 200 to attenuate adjacent signals. Thereafter, a digital amplifier 300 is passed to compensate for insertion loss generated by the first SAW filter 200. Thereafter, the analog SAW signal is extracted by passing through the second SAW filter 200. Accordingly, when the intermediate frequency signal output from the intermediate frequency circuit unit 100 is directly input to the second SAW filter 400, analog performance may be satisfied.
이상에서 실시예를 중심으로 설명하였으나 이는 단지 예시일 뿐 본 발명을 한정하는 것이 아니며, 본 발명이 속하는 분야의 통상의 지식을 가진 자라면 본 실시예의 본질적인 특성을 벗어나지 않는 범위에서 이상에 예시되지 않은 여러 가지의 변형과 응용이 가능함을 알 수 있을 것이다. 예를 들어, 실시예에 구체적으로 나타난 각 구성 요소는 변형하여 실시할 수 있는 것이다. 그리고 이러한 변형과 응용에 관계된 차이점들은 첨부된 청구 범위에서 규정하는 본 발명의 범위에 포함되는 것으로 해석되어야 할 것이다. Although the above description has been made based on the embodiments, these are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains may not have been exemplified above without departing from the essential characteristics of the present embodiments. It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.
디지털 방송수신장치에 이용할 수 있다.It can be used for digital broadcast receivers.

Claims (10)

  1. 안테나를 통해 수신되는 고주파 신호를 중간주파 신호로 동조하여 출력하는 중간주파 회로부;An intermediate frequency circuit unit for tuning and outputting a high frequency signal received through an antenna into an intermediate frequency signal;
    상기 중간주파 회로부에서 출력되는 중간주파 신호에서 디지털 방송주파 신호의 대역만을 통과시키는 제1 소우필터;A first saw filter for passing only a band of the digital broadcast frequency signal from the intermediate frequency signal output from the intermediate frequency circuit part;
    상기 제1 소우필터에서 감쇄된 상기 디지털 방송주파 신호를 증폭하는 디지털 증폭기;A digital amplifier amplifying the digital broadcast frequency signal attenuated by the first saw filter;
    상기 디지털 증폭기에서 증폭된 상기 디지털 방송주파 신호에서 아날로그 방송주파 신호의 대역만을 통과시키는 제2 소우필터; 및A second saw filter for passing only a band of an analog broadcast frequency signal in the digital broadcast frequency signal amplified by the digital amplifier; And
    상기 제2 소우필터에서 필터링된 상기 아날로그 방송주파 신호를 복조하여 출력하는 아날로그 복조부; An analog demodulator for demodulating and outputting the analog broadcast frequency signal filtered by the second saw filter;
    를 포함하는 방송수신 시스템.Broadcast receiving system comprising a.
  2. 제1항에 있어서,The method of claim 1,
    상기 제1 소우필터는 적어도 8MHz의 대역폭을 가지는 방송수신 시스템.The first saw filter has a bandwidth of at least 8MHz.
  3. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2,
    상기 제1 소우필터는 디지털 소우필터를 포함하는 방송수신 시스템.The first saw filter includes a digital saw filter.
  4. 제1항에 있어서,The method of claim 1,
    상기 제2 소우필터는 아날로그 소우필터를 포함하는 방송수신 시스템.And the second saw filter comprises an analog saw filter.
  5. 제1항에 있어서,The method of claim 1,
    상기 디지털 증폭기에서 증폭된 상기 디지털 방송주파 신호를 원하는 디지털 오디오/비디오신호로 복조하여 출력하는 디지털 복조부를 포함하는 방송수신 시스템.And a digital demodulator for demodulating and outputting the digital broadcast frequency signal amplified by the digital amplifier into a desired digital audio / video signal.
  6. 제1항에 있어서,The method of claim 1,
    중간주파 회로부는 MO PLL(Mixer and Oscillator Phase-locked loop)을 포함하는 방송수신 시스템.Intermediate frequency circuit section is a broadcast receiving system including a MO PLL (Mixer and Oscillator Phase-locked loop).
  7. 안테나를 통해 수신되는 고주파 신호를 중간주파 신호로 동조하여 출력하는 단계;Tuning and outputting a high frequency signal received through an antenna to an intermediate frequency signal;
    상기 중간주파 신호에서 디지털 방송주파 신호의 대역을 통과시키는 단계;Passing a band of a digital broadcast frequency signal from the intermediate frequency signal;
    상기 디지털 방송주파 신호 대역의 중간주파 신호를 증폭하는 단계;Amplifying the intermediate frequency signal of the digital broadcast frequency signal band;
    상기 증폭된 상기 디지털 방송주파 신호 대역의 중간주파 신호에서 아날로그 방송주파 신호의 대역을 통과시키는 단계; 및 Passing a band of an analog broadcast frequency signal from the amplified intermediate frequency signal of the digital broadcast frequency signal band; And
    상기 아날로그 방송주파 신호를 복조하여 출력하는 단계를 포함하는 방송수신 시스템의 제어방법.Demodulating and outputting the analog broadcast frequency signal.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 디지털 방송주파 신호의 대역을 통과시키는 단계는,Passing the band of the digital broadcast frequency signal,
    적어도 8MHz의 대역폭을 가지는 디지털 소우필터를 이용하여 상기 디지털 방송주파 신호의 대역을 통과시키는 단계를 포함하는 방송수신 시스템의 제어방법.And passing the band of the digital broadcast frequency signal using a digital saw filter having a bandwidth of at least 8 MHz.
  9. 제7항에 있어서,The method of claim 7, wherein
    상기 아날로그 방송주파 신호의 대역을 통과시키는 단계는,Passing the band of the analog broadcast frequency signal,
    아날로그 소우필터를 이용하여 상기 아날로그 방송주파 신호의 대역을 통과시키는 단계를 포함하는 방송수신 시스템의 제어방법.And passing the band of the analog broadcast frequency signal using an analog saw filter.
  10. 제7항에 있어서,The method of claim 7, wherein
    상기 증폭된 상기 디지털 방송주파 신호 대역의 중간주파 신호를 디지털 오디오/비디오신호로 복조하여 출력하는 단계를 포함하는 방송수신 시스템의 제어방법.And demodulating and outputting the amplified intermediate frequency signal of the digital broadcast frequency signal band into a digital audio / video signal.
PCT/KR2009/006122 2008-10-27 2009-10-22 Broadcast receiving system and control method thereof WO2010050696A2 (en)

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