WO2008018706A1 - Dispositif de réception de diffusion et procédé de réception de diffusion correspondant - Google Patents

Dispositif de réception de diffusion et procédé de réception de diffusion correspondant Download PDF

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Publication number
WO2008018706A1
WO2008018706A1 PCT/KR2007/003657 KR2007003657W WO2008018706A1 WO 2008018706 A1 WO2008018706 A1 WO 2008018706A1 KR 2007003657 W KR2007003657 W KR 2007003657W WO 2008018706 A1 WO2008018706 A1 WO 2008018706A1
Authority
WO
WIPO (PCT)
Prior art keywords
band
signals
unit
radio frequency
frequency signals
Prior art date
Application number
PCT/KR2007/003657
Other languages
English (en)
Inventor
Young Keun Kim
Original Assignee
Lg Innotek Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lg Innotek Co., Ltd filed Critical Lg Innotek Co., Ltd
Priority to CN2007800010143A priority Critical patent/CN101352036B/zh
Publication of WO2008018706A1 publication Critical patent/WO2008018706A1/fr

Links

Classifications

    • 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
    • H03J5/24—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 with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—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 with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—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 with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • 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
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • 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

Definitions

  • Embodiments relates to a broadcasting receiving apparatus and a broadcasting receiving method thereof.
  • a tuner is a broadcasting receiving apparatus and includes a function of selecting a channel selected by a user and converting signals received through the selected channel into intermediate frequency signals.
  • the reception band of the tuner includes not only a very high frequency (VHF) band reaching tens of MHz to hundreds of MHz but also an ultra high frequency (UHF) band reaching hundreds of MHz to tens of GHz. Disclosure of Invention Technical Problem
  • Embodiments provide a broadcasting receiving apparatus that reduces frequency interferences caused by selection of a channel in predetermined band, and a broadcasting receiving method thereof.
  • An embodiment provides a broadcasting receiving apparatus, comprising: a first band tuning unit for tuning received radio frequency signals with signals in a first band; an intermediate frequency converting unit for converting the tuned radio frequency signals into intermediate frequency signals; and an attenuating unit for attenuating radio frequency signals in a band more than a first band of radio frequency signals that have passed through the first band tuning unit.
  • An embodiment provides a broadcasting receiving apparatus, comprising: a first band tuning unit for tuning received radio frequency signals with signals in a very high frequency-low band; a second band tuning unit for tuning received radio frequency signals with signals in a very high frequency-high band; a third band tuning unit for tuning received radio frequency signals with signals in an ultra high frequency band; an intermediate frequency converting unit for converting signals in a tuned band of the bands of the first to third band tuning units into intermediate frequency signals; and an attenuating unit for attenuating radio frequency signals in a band more than the tuned very high frequency-low band.
  • An embodiment provides a broadcasting receiving method, comprising: selecting signals of a channel in a very high frequency-low band from a plurality of frequency bands; tuning radio frequency signals received through the selected channel with signals in the very high frequency-low band; attenuating signals in a band more than the tuned very high frequency-low band; and converting the signals in the very high frequency-low band into intermediate frequency signals; and filtering a desired signals from the intermediate frequency signals.
  • radio frequency signals in a band excluding a VHF-low band are attenuated upon selection of the VHF-low band, so that frequency interference can be reduced when signals are converted into intermediate frequency signals.
  • FIG. 1 is a block diagram of a broadcasting receiving apparatus according to an embodiment.
  • FIG. 2 is a circuit diagram illustrating an example of the attenuating unit of Fig. 1.
  • FIG. 3 is a circuit diagram illustrating another example of the attenuating unit of Fig.
  • Fig. 4 is a waveform diagram illustrating an attenuation example of radio frequency signals in bands excluding a first band according to an embodiment.
  • FIG. 5 is a flowchart illustrating a broadcasting receiving method according to an embodiment. Best Mode for Carrying Out the Invention
  • FIG. 1 is a block diagram of a broadcasting receiving apparatus according to an embodiment.
  • the broadcasting receiving apparatus 100 can be at least one of a tuner for analog broadcasting, a tuner for digital broadcasting, and a tuner for analog/ digital broadcasting.
  • the broadcasting receiving apparatus 100 includes a tuning portion 110, an attenuating unit 150, an intermediate frequency converting unit 160, a filter unit 170, and a demodulating unit 180. [19] The tuning portion 110 attunes radio frequency signals received through an antenna
  • the tuning portion 110 attunes the radio frequency signals to signals in three bands, for example.
  • the tuning portion 110 can include a first band tuning unit 120, a second band tuning unit 130, and a third band tuning unit 140.
  • the first band tuning unit 120 attunes received radio frequency signals to signals in a
  • the second band tuning unit 130 attunes received radio frequency signals to signals in a VHF-high band
  • the third band tuning unit 140 attunes received radio frequency signals to signals in a UHF band.
  • the VHF-low band includes in a range of 50-170 MHz
  • the VHF-high band includes in a range of 170-470 MHz
  • the UHF band includes in a range of 470-860 MHz.
  • the first band tuning unit 120 includes a first band input circuit 121, a first amplifier
  • the first band input circuit 121 passes signals in the VHF-low band of 50-170 MHz of received radio frequency signals.
  • the first amplifier 122 amplifies radio frequency signals that pass through the first band input circuit 121.
  • the first band tuning circuit 123 attunes the radio frequency signals amplified by the first amplifier 122 and outputs the same.
  • the second band tuning unit 130 includes a second band input circuit 131, a second amplifier 132, and a second band tuning circuit 133.
  • the second band input circuit 131 passes signals in the VHF-high band of 170-470 MHz of received radio frequency signals.
  • the second amplifier 132 amplifies radio frequency signals that pass through the second band input circuit 131.
  • the second band tuning circuit 133 attunes the radio frequency signals amplified by the second amplifier 132 and outputs the same.
  • the third band tuning unit 140 includes a third band input circuit 141, a third amplifier 142, and a third band tuning circuit 143.
  • the third band input circuit 141 passes signals in the UHF band of 470-860 MHz of received radio frequency signals.
  • the third amplifier 142 amplifies radio frequency signals that pass through the third band input circuit 141.
  • the third band tuning circuit 143 attunes the radio frequency signals amplified by the third amplifier 142 and outputs the same.
  • Both ends Pl and P2 of the attenuating unit 150 are connected to an output terminal of the first band tuning unit 120 and an input terminal of the intermediate frequency converting unit 160, respectively.
  • the attenuating unit 150 attenuates radio frequency signals in a band more than the first band, for example, radio frequency signals of 500 MHz or more of radio frequency signals from the first band tuning unit 120 to a range of 10-15 dB.
  • radio frequency signals of 200-500 MHz are attenuated to a range of 0-10 dB, and signals of 200 MHz or less are not attenuated.
  • the intermediate frequency converting unit 160 includes a phase locked loop integrated circuit (PLL IC) 161, a local oscillator 162, and a mixer 163.
  • the PLL IC 161 outputs a control voltage corresponding to channel data to the local oscillator 162 in response to an external control signal.
  • the local oscillator 162 outputs predetermined local oscillation frequency to the mixer 163 in response to the control voltage.
  • the mixer 163 mixes input radio frequency signals with the local oscillation frequency to output the mixed signals.
  • the intermediate frequency converting unit 160 can be embodied by integrating the PLL IC 161, the local oscillator 162, the mixer 163 into a mixer oscillator phase locked loop (MOPLL) IC, which is one chip.
  • the MOPLL IC can include an automatic gain control signal detecting circuit therein. Therefore, both ends Pl and P2 of the attenuating unit 150 are connected between the first band tuning circuit 123 and the MOPLL IC.
  • the filter unit 170 can be embodied using a surface acoustic wave (SAW) filter to pass only desired signals.
  • SAW surface acoustic wave
  • an intermediate frequency amplifier can be provided between the filter unit 170 and the intermediate frequency converting unit 160 depending on the characteristic of the SAW filter.
  • the filter unit 170 can include a filter for analog broadcasting and/or a filter for digital broadcasting depending on the kind of a tuner.
  • the filter unit 170 includes an audio filter and a video filter.
  • the filter unit 170 includes a digital filter.
  • the filter unit 170 can include an audio filter, a video filter, and a digital filter.
  • the demodulating unit 180 demodulates signals that have passed through the filter unit 170 into original signals.
  • the demodulating unit 180 can be realized as an analog demodulating unit and/or a digital demodulating unit.
  • VHF-low band is described below using an example.
  • the intermediate frequency converting unit 160 converts received radio frequency signals in the VHF-low band into intermediate frequency signals. At this point, desired waves of 48.25 MHz received from the first band tuning unit 120 are mixed with signals of a local oscillation frequency of 87.15 MHz. A difference in the frequency between two kinds of signals becomes the intermediate frequency of 38.9 MHz.
  • radio frequency signals of 500 MHz or more can be included in radio frequency signals tuned by the first band tuning unit 120.
  • the radio frequency signals of 500 MHz or more and multiplied frequency signals of the local oscillator 162 are mixed.
  • the multiplied frequency signals interfere around the intermediate frequency while the tuned frequency signals and the multiplied frequency signals are mixed at the mixer 162, interferences are generated to the intermediate frequency signals under conversion.
  • the attenuating unit 150 attenuates radio frequency signals in a band more than the VHF- low band, for example, radio frequency signals of 500 MHz or more, at the output end Pl of the first band tuning unit 120, thereby preventing multiplied frequency signals from interfering with signals of a channel in the VHF-low band. Therefore, a limitation that a large amount of beats is generated upon selection of a channel in the VHF-low band in a strong electric field can be solved.
  • Fig. 2 is a circuit diagram illustrating an example of the attenuating unit of Fig. 1.
  • one end Pl of the attenuating unit 150 is connected to an output terminal of the first band tuning circuit 123 of the first band tuning unit 120, and the other end P2 of the attenuating unit 150 is connected to an input terminal of the intermediate frequency converting unit 160.
  • the attenuating unit 150 can be embodied using a trap circuit 151 including a first inductor Ll and a first capacitor Cl connected with each other in parallel.
  • the trap circuit 151 attenuates signals of 500 MHz or more of radio frequency signals that have passed through the first band tuning unit 120 to a range of 10-15 dB, and then outputs the signals to the intermediate frequency converting unit 160.
  • Fig. 3 is a circuit diagram illustrating another example of the attenuating unit of Fig.
  • the attenuating unit 150 includes a first inductor Ll and a first capacitor Cl connected to each other in parallel, and a second capacitor C2 having one end connected to the first inductor Ll and having the other end grounded.
  • the first inductor Ll and the first capacitor Cl operate as the trap circuit 151
  • the first inductor Ll and the second capacitor C2 operate as a low pass filter (LPF)
  • the trap circuit 151 attenuates radio frequency signals of 500 MHz or more to a range of 10-15 dB using the first inductor Ll and the first capacitor Cl.
  • the LPF 152 passes radio frequency signals of 200 MHz or less using the first inductor Ll and the second capacitor C2.
  • the attenuating unit 150 attenuates signals of 500 MHz or more of radio frequency signals that have passed through the first band tuning unit 120 and passes only signals of 200 MHz or less upon selection of the VHF-low band to reduce interferences generated to signals in a channel of the VHF-low band.
  • radio frequency signals of 200-500 MHz are attenuated to a range of 0-10 dB.
  • the attenuating unit 150 can selectively provide a trap circuit and/or a filter using at least one inductor and capacitor, and can add a resistor if necessary. Accordingly, the attenuating unit 150 is not limited to the above-described circuit.
  • Fig. 4 is a waveform diagram illustrating a trapping example of radio frequency signals in bands excluding a first band according to an embodiment.
  • the trap circuit of the attenuating unit attenuates signals of 500
  • radio frequency signals (S2) in a desired wave band of 48.25 MHz or more of signals (Sl) in the VHF-low band. Accordingly, frequency interference generated to intermediate frequency signals by a multiplied frequency can be reduced.
  • FIG. 5 is a flowchart illustrating a broadcasting receiving method according to an embodiment.
  • VHF-low band, a VHF-high band, and an UHF band is input through radio frequency signals received through an antenna, and respective tuning units attunes signals (S 104, S 106, and S 108).
  • radio frequency signals in a band more than the VHF-low band of signals having frequencies tuned to the VHF-low band are attenuated by the attenuating unit and outputted (Sl 10).
  • Sl 10 radio frequency signals of 500 MHz or more are attenuated by a predetermined gain, or only signals of 200 MHz or less can be passed during the attenuation operation. This is for preventing interference from being generated between radio frequency signals of the band more than the VHF-low band and a multiplied frequency.
  • radio frequency signals of 200-500 MHz are attenuated to a range of 0-10 dB.
  • the tuned radio frequency signals are converted into intermediate frequency signals (Sl 12), and the intermediate frequency signals are filtered, and then demodulated to original signals (Sl 14 and Sl 16).
  • radio frequency signals in a band excluding a VHF-low band are attenuated upon selection of the VHF-low band, so that frequency interference can be reduced when the signals are converted into intermediate frequency signals.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention concerne un dispositif de réception de diffusion et un procédé de réception de diffusion correspondant. Ce dispositif comprend un premier système d'accord de bande, une unité de conversion de fréquence intermédiaire, et une unité d'atténuation. Le premier système d'accord de bande harmonise les signaux radioélectriques reçus avec les signaux dans une première bande de fréquence. L'unité de conversion de fréquence intermédiaire convertit les signaux radioéletriques accordés en signaux à fréquence intermédiaire. L'unité d'atténuation atténue les signaux radioélectriques dans une bande supérieure à une première bande de signaux radioélectriques ayant passés à travers le premier système d'accord de bande.
PCT/KR2007/003657 2006-08-11 2007-07-30 Dispositif de réception de diffusion et procédé de réception de diffusion correspondant WO2008018706A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2007800010143A CN101352036B (zh) 2006-08-11 2007-07-30 广播接收设备及其广播接收方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0076145 2006-08-11
KR1020060076145A KR20080014437A (ko) 2006-08-11 2006-08-11 튜너

Publications (1)

Publication Number Publication Date
WO2008018706A1 true WO2008018706A1 (fr) 2008-02-14

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PCT/KR2007/003657 WO2008018706A1 (fr) 2006-08-11 2007-07-30 Dispositif de réception de diffusion et procédé de réception de diffusion correspondant

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CN (1) CN101352036B (fr)
WO (1) WO2008018706A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102195666A (zh) * 2011-04-14 2011-09-21 西安烽火电子科技有限责任公司 Vhf、uhf频段宽带高速数据传输平台
KR20140043974A (ko) * 2012-10-04 2014-04-14 엘지이노텍 주식회사 방송 수신 장치
CN104202045B (zh) * 2014-08-07 2017-12-08 南京誉葆科技有限公司 宽带自检信号源

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5913155A (en) * 1996-02-14 1999-06-15 Sony Corportaion Broadcasting signal receiving apparatus and pulse counting demodulators
US6999742B2 (en) * 2002-07-26 2006-02-14 Mitsubishi Electric Research Laboratories, Inc. By-passing adjacent channel interference removal in receivers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2489526Y (zh) * 2001-07-13 2002-05-01 安徽四创电子股份有限公司 用于直接广播卫星电视的数字一体化调谐器
JP2003283352A (ja) * 2002-03-20 2003-10-03 Sharp Corp 高周波受信装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5913155A (en) * 1996-02-14 1999-06-15 Sony Corportaion Broadcasting signal receiving apparatus and pulse counting demodulators
US6999742B2 (en) * 2002-07-26 2006-02-14 Mitsubishi Electric Research Laboratories, Inc. By-passing adjacent channel interference removal in receivers

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Publication number Publication date
CN101352036A (zh) 2009-01-21
KR20080014437A (ko) 2008-02-14
CN101352036B (zh) 2013-08-07

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