WO2005043895A1 - アナログ/デジタル共用フロントエンドモジュール - Google Patents
アナログ/デジタル共用フロントエンドモジュール Download PDFInfo
- Publication number
- WO2005043895A1 WO2005043895A1 PCT/JP2004/016294 JP2004016294W WO2005043895A1 WO 2005043895 A1 WO2005043895 A1 WO 2005043895A1 JP 2004016294 W JP2004016294 W JP 2004016294W WO 2005043895 A1 WO2005043895 A1 WO 2005043895A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- analog
- digital
- signal
- frequency
- demodulator
- Prior art date
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Classifications
-
- 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
- H04N5/52—Automatic gain control
-
- 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
-
- 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
- H04N21/42638—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners involving a hybrid front-end, e.g. analog and digital tuners
-
- 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
- H04N5/4446—IF amplifier circuits specially adapted for B&W TV
-
- 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
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
Definitions
- the present invention relates to an analog digital front end module capable of receiving analog television broadcasting and digital television broadcasting.
- a new digital television broadcasting has started, and for the time being, analog television broadcasting and digital television broadcasting will be transmitted simultaneously.
- digital television broadcasting is transmitted at a lower transmission power than analog television broadcasting, so that digital television broadcasting does not adversely affect analog television broadcasting. It is transmitted using a channel during analog television broadcasting. Therefore, a digital broadcast receiver is required to have not only sensitivity when receiving a weak electric field but also characteristics that can withstand interference from an adjacent channel. , ——
- an analog demodulator and digital demodulator are provided in a single receiving circuit.
- an analog Z digital shared front-end module that can receive both analog and digital television broadcasts.
- Patent Document 1 Japanese Patent Application Laid-Open No. H11-988426
- Patent Literature 2 Japanese Patent Application Laid-Open No. Hei 11-2-6 1913
- Patent Document 3 Japanese Patent Application Laid-Open No. 2000-59097 Patent Document 4. JP-A-2003-204274
- the analog Z digital shared front-end module shown in Fig. 2 is a tuner section (17) that should perform channel selection processing on the high-frequency signal received by the antenna (1), and outputs from the tuner section (17). And a demodulation unit (21) for processing the intermediate frequency signal.
- the analog / digital switching switches (4) and (19) constituting the demodulation unit (21) are connected to the analog demodulator (5).
- the analog switch z digital switching switch (4) ⁇ 9) is switched to the digital demodulator (6) side.
- the high-frequency signal received by the antenna (1) passes through a first band-pass filter (8), a high-frequency amplifier (9), a second bandpass filter (10), and is supplied to a frequency conversion circuit (18). Conversion is performed.
- the intermediate frequency signal output from the tuner section (17) passes through the elastic surface wave filter (3), the analog / digital switch (4), and then to the analog demodulator (5) or digital demodulator (6). It is supplied and demodulated.
- the output signal of the analog demodulator (5) is supplied as a high frequency gain control (RF AGC) signal to the high frequency amplifier (9) of the tuner section (17), and the high frequency amplifier (9) Is controlled.
- the output signal of the digital demodulator (6) is supplied to the high-frequency amplifier (9) of the tuner (17) as a high-frequency gain control (RF AGC) signal. The gain is controlled.
- the gain control (AGC) of the high-frequency amplifier (9) is performed based on the intermediate frequency signal that has passed through the narrow-band surface acoustic wave filter (3). Therefore, accurate AGC control for the desired wave is realized.
- the analog / digital shared front-end module shown in Fig. 3 consists of a tuner section (2) that should perform tuning processing on the high-frequency signal received by the antenna (1), and an intermediate-frequency signal output from the tuner section (2). And a demodulation unit (20) for processing analog signals.
- the analog Z-digital switching switch (4) constituting the demodulation unit (20) has While receiving the digital broadcast, the analog Z digital switch (4) is switched to the digital demodulator (6) while the digital demodulator (5) is switched.
- the high-frequency signal received by the antenna (1) passes through a first band-pass filter (8), a high-frequency amplifier (9), a second band-pass filter (10), and is supplied to a frequency conversion circuit (11). The frequency conversion is performed.
- the intermediate frequency signal output from the tuner section (2) passes through an elastic surface wave filter (3), an analog / digital switch (4), and then to an analog demodulator (5) or a digital demodulator (6). It is supplied and demodulated.
- the output signal of the AGC signal detection circuit (15) connected to the output terminal of the intermediate frequency amplifier (14) constituting the frequency conversion circuit (11) high-frequency gain control (RFAGC) signal is supplied to the high-frequency amplifier (9), and the gain of the high-frequency amplifier (9) is controlled.
- RAGC high-frequency gain control
- the gain control (AGC) of the high-frequency amplifier (9) is performed based on the intermediate-frequency signal that has been subjected to frequency conversion through the broadband band-pass filter (10). Therefore, if there is an interfering signal at a higher level than the desired signal in the adjacent channel, control is performed to detect the interfering signal and reduce the gain of the high-frequency amplifier (9). As a result, the frequency conversion is performed. Since the level of the signal input to the mixer (13) and the intermediate frequency amplifier (14) constituting the circuit (11) decreases, there is no possibility that the saturation level of the mixer (13) or the intermediate frequency amplifier (14) will be exceeded. The distortion characteristics are advantageous.
- an object of the present invention is to reduce the SZN ratio, which is a problem in analog broadcasting, and to be a problem when digital broadcasting starts, regardless of whether the broadcast to be received is analog broadcasting or digital broadcasting. It is an object of the present invention to provide an analog / digital shared front end module having both good distortion characteristics.
- An analog / digital shared front-end module includes a high-frequency amplifier (9) for amplifying a high-frequency signal received by an antenna (1), and an intermediate-frequency signal by performing frequency conversion on an output signal of the high-frequency amplifier (9).
- An analog demodulator for receiving analog television broadcasting (5), a digital demodulator for receiving digital television broadcasting (6), and an analog demodulator (5) for outputting the output signal of the frequency converting circuit.
- digital / demodulator (6) for controlling the gain of the high-frequency amplifier (9) according to the gain control signal obtained from the analog demodulator (5) when receiving the analog broadcast.
- the gain of the high-frequency amplifier (9) depends on the gain control signal generated from the output signal of the frequency conversion circuit. And and means switching the gain control to control.
- a wide band filter is interposed between the high frequency amplifier (9) and the frequency conversion circuit, and a narrow band filter is interposed between the frequency conversion circuit and the analog / digital switching means. Intervening.
- the frequency conversion circuit includes an intermediate frequency amplifier (14) for amplifying the intermediate frequency signal subjected to the frequency conversion.
- the gain control signal is obtained from the output signal of the intermediate frequency amplifier (14). It is created and provided for gain control of the high-frequency amplifier (9) by gain control switching means.
- the gain control switching means switches a gain control signal generated from an output signal of the frequency conversion circuit and a gain control signal obtained from the analog demodulator (5) and supplies the signal to the high-frequency amplifier (9). It is constituted by a changeover switch (7).
- the analog Z digital switching means when analog broadcasting is received, the analog Z digital switching means is switched to the analog demodulator (5) side and the output of the frequency conversion circuit is output. The signal is supplied to an analog demodulator (5). Further, the gain control switching means is switched to the analog demodulator (5), and the gain of the high frequency amplifier (9) is controlled according to the gain control signal obtained from the analog demodulator (5).
- gain control (AGC) of the high-frequency amplifier (9) is performed based on the level of the desired wave (intermediate frequency signal), and AGC with high accuracy for the desired wave is realized.
- AGC gain control
- AGC is applied based on the level of the desired signal.Therefore, as the level of the interfering signal increases, the distortion characteristics in the frequency conversion circuit may increase. Deterioration will occur, but the digital broadcast signal, which is an obstruction during analog broadcast reception, is held at a lower level than the analog broadcast signal, so that the distortion characteristics do not deteriorate.
- the signal is switched to the (6) side, and the output signal of the frequency conversion circuit is supplied to the digital demodulator (6). Further, the gain control switching means is switched to the frequency conversion circuit side, and the gain of the high frequency amplifier (9) is controlled in accordance with the frequency control and the gain control signal generated from the output signal of the circuit. As a result, the gain control (AGC) of the high-frequency amplifier (9) is performed based on the intermediate frequency signal including the interfering wave present in the adjacent channel. If there is, the control circuit lowers the gain of the high-frequency amplifier (9) by detecting the interference wave and lowers the level of the signal input to the frequency conversion circuit, so that the distortion characteristic of the frequency conversion circuit is advantageous. It becomes something.
- AGC is applied based on the level of the interfering signal.Therefore, when the signal level of the desired signal decreases, the SZN characteristics deteriorate. Since digital broadcast signals are less susceptible to noise, the picture quality does not degrade due to slight deterioration of the SZN characteristic.
- FIG. 1 is a block diagram showing a configuration of an analog / digital shared frontend module according to the present invention.
- FIG. 2 is a block diagram showing the configuration of a conventional analog / digital shared front-end module.
- FIG. 3 is a block diagram showing the configuration of another conventional analog / digital shared front-end module.
- an analog Z digital shared front-end module includes a tuner section (2) for processing a high-frequency signal received by an antenna (1) and a tuner section (2).
- a demodulation unit (20) for processing the output intermediate frequency signal is provided.
- the analog Z digital switching switch (4) constituting the demodulation unit (20) is connected to the analog demodulator (5).
- the analog / digital switch (4) is switched to the digital demodulator (6).
- the high-frequency signal received by the antenna (1) passes through a first band-pass filter (8), which is an RF filter, a high-frequency amplifier (9), and a second bandpass filter (10), which is an RF filter, and is frequency-converted.
- the frequency conversion circuit (11) includes a local oscillator (12) and a mixer (13), and an intermediate frequency bandpass filter (16), which is an IF filter, is provided between the mixer 3) and the intermediate frequency amplifier (14). Intervening.
- An output terminal of the intermediate frequency amplifier (14) of the frequency conversion circuit (11) is connected to an AGC signal detection circuit (15).
- the intermediate frequency signal output from the tuner section (2) is supplied to an analog demodulator (5) or a digital demodulator (6) via a surface acoustic wave filter (3), an analog / digital switching switch (4). Then, demodulation processing is performed.
- the surface acoustic wave filter (3) is composed of the second bandpass filter (10) and the intermediate frequency bandpass filter that constitute the tuner section (2). It has a narrower passband than the filter (16) and selectively separates only the desired wave.
- the output terminal of the AGC signal detection circuit (15) and the output terminal of the analog demodulator (5) are connected to the two input terminals of the AGC signal switching switch (7), respectively, and are selected by the switch (7).
- the resulting signal is supplied to a high frequency amplifier (9) as a high frequency gain control (RFAGC) signal. .
- RAGC high frequency gain control
- the analog / digital switch (4) is switched to the analog demodulator (5) and the output signal of the surface acoustic wave filter (3) is converted to the analog demodulator (5). ). Also, the AGC signal switching switch (7) is switched to the analog demodulator (5), and the gain of the high frequency amplifier (9) is controlled according to the AGC signal obtained from the analog demodulator (5). .
- gain 1 control (AGC) of the high-frequency amplifier (9) is performed based on the level of the desired wave, and AGC with high accuracy for the desired wave is realized. Also, since the level of the desired wave is maintained at the optimum value by the AGC, a high SZN characteristic can be obtained. Note that if there is an interfering signal at a higher level than the desired signal in the adjacent channel, AGC is applied based on the signal level of the desired signal, and the signal of the desired signal is clipped to the optimum value. When the level of the interfering wave increases, the mixer ⁇ 3) and the intermediate frequency amplifier
- the distortion characteristics of (14) will deteriorate, the level of digital broadcast signals, which can be a hindrance when receiving analog broadcasts, is lower than that of analog broadcast signals.
- the distortion characteristic of (14) hardly deteriorates.
- the analog / digital switch (4) is switched to the digital demodulator (6), and the output signal of the surface acoustic wave filter (3) is supplied to the digital demodulator (6).
- the AGC signal switching switch (7) is switched to the frequency conversion circuit (11), and the gain of the high frequency amplifier (9) is controlled according to the output signal of the AGC signal detection circuit (15).
- the gain control (AGC) of the high-frequency amplifier (9) is performed based on the intermediate frequency signal including the interfering wave present in the adjacent channel, so that the adjacent channel is more than the desired wave. If a high-level interference wave is present, control is performed to detect the interference wave and reduce the gain of the high-frequency amplifier (9), and the level of the signal input to the frequency conversion circuit (11) is reduced. Therefore, the distortion characteristics of the mixer (13) and the intermediate frequency amplifier (14) are advantageous.
- AGC is applied based on the level of the interfering signal, and the level of the interfering signal is clipped to the optimum value.
- the optimal AGC detection method is selected according to whether the broadcast to be received is an analog broadcast or a digital broadcast. Good distortion characteristics and SZN characteristics can be obtained in both digital broadcasting and digital broadcasting.
- the optimal AGC detection method is selected according to whether the broadcast to be received is an analog broadcast or a digital broadcast. In both cases, good distortion characteristics and SZN characteristics can be obtained.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/553,739 US7477327B2 (en) | 2003-10-31 | 2004-10-27 | Analog/digital-compatible front-end module |
EP04793327A EP1694062A4 (en) | 2003-10-31 | 2004-10-27 | ANALOG / DIGITAL-ENABLED FRONT-END MODULE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003372032A JP2005136790A (ja) | 2003-10-31 | 2003-10-31 | アナログ/デジタル共用フロントエンドモジュール |
JP2003-372032 | 2003-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005043895A1 true WO2005043895A1 (ja) | 2005-05-12 |
Family
ID=34543989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016294 WO2005043895A1 (ja) | 2003-10-31 | 2004-10-27 | アナログ/デジタル共用フロントエンドモジュール |
Country Status (6)
Country | Link |
---|---|
US (1) | US7477327B2 (ja) |
EP (1) | EP1694062A4 (ja) |
JP (1) | JP2005136790A (ja) |
KR (1) | KR20060107267A (ja) |
CN (1) | CN100454989C (ja) |
WO (1) | WO2005043895A1 (ja) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1844606A1 (en) * | 2005-01-28 | 2007-10-17 | Philips Intellectual Property & Standards GmbH | Intermediate frequency processing device for processing both analogue and digital television intermediate frequency signals |
JP4348550B2 (ja) | 2005-10-19 | 2009-10-21 | ソニー株式会社 | フロントエンドモジュール及びテレビジョン受像機 |
JP2007329569A (ja) * | 2006-06-06 | 2007-12-20 | Sharp Corp | チューナ |
KR100872550B1 (ko) * | 2006-08-24 | 2008-12-08 | 엘지이노텍 주식회사 | 튜너의 자동이득제어회로 |
US8004610B2 (en) | 2006-12-19 | 2011-08-23 | Intel Corporation | Techniques to enable digital television and GPS coexistence |
CN100466774C (zh) * | 2007-05-18 | 2009-03-04 | 华为技术有限公司 | 一种扇区化基站 |
KR100856263B1 (ko) * | 2007-05-30 | 2008-09-03 | 삼성전기주식회사 | 복합 방송 수신장치 |
JP2009038492A (ja) * | 2007-07-31 | 2009-02-19 | Toshiba Corp | 放送受信装置及び放送受信方法 |
JP2009088618A (ja) | 2007-09-27 | 2009-04-23 | Sanyo Electric Co Ltd | 受信装置 |
US7649407B2 (en) * | 2007-09-28 | 2010-01-19 | Intel Corporation | Digitally tuned, integrated RF filters with enhanced linearity for multi-band radio applications |
US7750697B2 (en) * | 2008-03-31 | 2010-07-06 | International Business Machines Corporation | Fractional-N phased-lock-loop (PLL) system |
JP2010141689A (ja) * | 2008-12-12 | 2010-06-24 | Sanyo Electric Co Ltd | 放送信号変換装置 |
EP2267892A1 (en) * | 2009-06-19 | 2010-12-29 | Thomson Licensing | Receiver with analog and digital gain control, and respective method |
US8693595B2 (en) * | 2011-05-10 | 2014-04-08 | Issc Technologies Corp. | Adaptive wireless communication receiver |
JP5753622B1 (ja) * | 2014-10-20 | 2015-07-22 | 株式会社日本ビデオシステム | 光伝送システム |
US10547288B2 (en) * | 2016-11-25 | 2020-01-28 | Murata Manufacturing Co., Ltd. | Radio frequency front-end circuit and communication device |
CN108632654B (zh) * | 2017-03-23 | 2021-10-22 | 国基电子(上海)有限公司 | 信号切换电路及前端电路 |
CN109309855A (zh) * | 2017-07-27 | 2019-02-05 | 国基电子(上海)有限公司 | 信号分离器及前端电路 |
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JPH0730824A (ja) * | 1993-07-07 | 1995-01-31 | Matsushita Electric Ind Co Ltd | ディジタル放送受信機 |
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JP3241098B2 (ja) * | 1992-06-12 | 2001-12-25 | 株式会社東芝 | 多方式対応の受信装置 |
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2003
- 2003-10-31 JP JP2003372032A patent/JP2005136790A/ja active Pending
-
2004
- 2004-10-27 US US10/553,739 patent/US7477327B2/en not_active Expired - Fee Related
- 2004-10-27 WO PCT/JP2004/016294 patent/WO2005043895A1/ja active Application Filing
- 2004-10-27 KR KR1020057007476A patent/KR20060107267A/ko active IP Right Grant
- 2004-10-27 EP EP04793327A patent/EP1694062A4/en not_active Withdrawn
- 2004-10-27 CN CNB2004800164665A patent/CN100454989C/zh not_active Expired - Fee Related
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JPH0730824A (ja) * | 1993-07-07 | 1995-01-31 | Matsushita Electric Ind Co Ltd | ディジタル放送受信機 |
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JPH08181556A (ja) | 1994-12-21 | 1996-07-12 | Toshiba Corp | デジタルアナログ共用チューナ |
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Also Published As
Publication number | Publication date |
---|---|
KR20060107267A (ko) | 2006-10-13 |
EP1694062A1 (en) | 2006-08-23 |
US7477327B2 (en) | 2009-01-13 |
CN1806435A (zh) | 2006-07-19 |
CN100454989C (zh) | 2009-01-21 |
JP2005136790A (ja) | 2005-05-26 |
US20060209216A1 (en) | 2006-09-21 |
EP1694062A4 (en) | 2006-12-06 |
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