JPH06133317A - Tuner - Google Patents
TunerInfo
- Publication number
- JPH06133317A JPH06133317A JP4276978A JP27697892A JPH06133317A JP H06133317 A JPH06133317 A JP H06133317A JP 4276978 A JP4276978 A JP 4276978A JP 27697892 A JP27697892 A JP 27697892A JP H06133317 A JPH06133317 A JP H06133317A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- intermediate frequency
- satellite
- catv
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はテレビジョン信号及び衛
星放送信号を受信するチューナ装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuner device for receiving a television signal and a satellite broadcast signal.
【０００２】[0002]
【従来の技術】近年、放送衛星や通信衛星を利用した様
々なサービスが開始され、従来のテレビジョン信号に加
え、高精細テレビジョン信号やＰＣＭ音声信号の放送も
行われるようになってきた。特に、日本や欧州で行われ
ているＰＣＭ音声放送は、データ誤り率が低く、高忠実
度の音質が得られるとともに、占有帯域幅が狭く、映像
信号に比べ多チャネルの伝送が可能となる利点があり、
このうち欧州（主にドイツ、オーストリア）においは文
献「アイ・イー・イー・イー、コンシューマエレクトロ
ニクス、第３５巻、第３号、第５０４項から第５１１
項、１９８９年、８月」（IEEE Trans.,CE,Vol.35,No3,
AUGUST 1989)に記載されている放送衛星による音声放送
（ＤＳＲ：Digital Satellite Radio、以下、ＤＳＲと
略記する）が行われている。このＤＳＲ放送システムは
衛星放送１チャネル分の帯域である２７ＭＨｚのうち１
６ＭＨｚを用いて１６チャネル分の音声信号をＱＰＳＫ
変調（直交移相変調）を行い時分割方式で伝送するもの
で、欧州では、９５０〜１７５０ＭＨｚの衛星第１中間
周波信号を１１８ＭＨｚの中間周波信号に周波数変換し
て出力するチューナ装置が用いられている。また、ＣＡ
ＴＶ放送においても２チャネル分の信号帯域（１４ＭＨ
ｚ）で同様の変調方式によりＳ２〜Ｓ３ｃｈの信号帯域
（中心周波数１１８ＭＨｚ）を用いて放送が行われてい
る。2. Description of the Related Art In recent years, various services using broadcasting satellites and communication satellites have been started, and in addition to conventional television signals, high-definition television signals and PCM audio signals have also been broadcast. In particular, PCM audio broadcasting performed in Japan and Europe has the advantages that the data error rate is low, high fidelity sound quality is obtained, the occupied bandwidth is narrow, and multi-channel transmission is possible compared to video signals. There is
Of these, in Europe (mainly Germany and Austria), reference is made to the literature “Ai E E, Consumer Electronics, Vol. 35, No. 3, 504 to 511.
, 1989, August "(IEEE Trans., CE, Vol.35, No3,
Audio broadcasting (DSR: Digital Satellite Radio, hereinafter abbreviated as DSR) by broadcasting satellites described in AUGUST 1989) is performed. This DSR broadcasting system uses 1 out of 27 MHz which is a band for one satellite broadcasting channel.
QPSK audio signals for 16 channels using 6 MHz
Modulation (quadrature phase shift modulation) is performed and transmission is performed in a time-division system. In Europe, a tuner device that frequency-converts a satellite first intermediate frequency signal of 950 to 1750 MHz into an intermediate frequency signal of 118 MHz and outputs the signal is used. There is. Also, CA
Even in TV broadcasting, the signal band for 2 channels (14 MH
In z), broadcasting is performed using a signal band of S2 to S3 ch (center frequency 118 MHz) by the same modulation method.
【０００３】[0003]
【発明が解決しようとする課題】このような音声放送が
受信可能な受信機では、ＣＡＴＶによるＤＳＲ放送が多
チャネル化した場合、Ｓ２〜Ｓ３ｃｈ以外のＣＡＴＶに
よるＤＳＲ放送を受信することは考慮されていない。ま
た、衛星および地上波テレビジョン放送受信機の他にＤ
ＳＲ放送受信機が必要となり、機器の小型化や使い勝手
性も考慮されていない。In a receiver capable of receiving such an audio broadcast, it is considered that the DSR broadcast by CATV other than S2 to S3 ch is received when the DSR broadcast by CATV has multiple channels. Absent. In addition to satellite and terrestrial television receivers, D
An SR broadcast receiver is required, and downsizing of the device and usability are not considered.
【０００４】本発明の目的は、上記課題に沿い、ＣＡＴ
ＶによるＤＳＲ放送の多チャネル化時にも受信が可能な
チューナ装置を提供することにある。また、本発明の他
の目的は、ＤＳＲ放送に加え、衛星および地上波テレビ
ジョン放送の受信が可能なチューナ装置を提供すること
にある。The object of the present invention is to meet the above-mentioned problems, and CAT
An object of the present invention is to provide a tuner device capable of receiving even when DSR broadcasting by V has multiple channels. Another object of the present invention is to provide a tuner device capable of receiving satellite and terrestrial television broadcasts in addition to DSR broadcasts.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明は、衛星によるＤＳＲ放送を受信する場合には
１ＧＨｚ帯の衛星第１中間周波信号を１１８ＭＨｚ帯の
中間周波信号に周波数変換する方式として、第１の周波
数変換器により４８０ＭＨｚ帯の衛星第２中間周波信号
に変換し、帯域選択後、第２の周波数変換器により１１
８ＭＨｚ帯の中間周波信号に変換する２段階の周波数変
換方式を採用した。またＣＡＴＶによるＤＳＲ放送とし
て、欧州ではＳ２〜Ｓ２０ｃｈ（１１０〜３００ＭＨ
ｚ）が使用可能であり、このＲＦ信号帯域を１１８ＭＨ
ｚ帯の中間周波信号に周波数変換する場合にも、第１の
周波数変換器により４８０ＭＨｚ帯の衛星第２中間周波
信号に等しい周波数に変換し、帯域選択後、第２の周波
数変換器により１１８ＭＨｚの中間周波信号に変換を行
うダブルスーパ方式を採用した。さらにＣＡＴＶによる
ＤＳＲ放送を受信する場合にはＣＡＴＶによるＤＳＲ放
送受信用の局部発振回路からの発振信号を、衛星による
ＤＳＲ放送を受信する場合には衛星によるＤＳＲ放送受
信用の局部発振回路からの発振信号を選択して第１の周
波数変換器に導くスイッチ回路を付加した。In order to solve the above-mentioned problems, the present invention frequency-converts a satellite first intermediate frequency signal of 1 GHz band to an intermediate frequency signal of 118 MHz band when receiving DSR broadcasting by a satellite. As a method, the first frequency converter converts the satellite second intermediate frequency signal in the 480 MHz band, and after selecting the band, the second frequency converter outputs 11
A two-stage frequency conversion system for converting to an intermediate frequency signal in the 8 MHz band is adopted. In addition, as DSR broadcasting by CATV, in Europe, S2 to S20ch (110 to 300MH
z) can be used, and this RF signal band is 118 MH
In the case of frequency conversion into the z-band intermediate frequency signal, the first frequency converter converts the frequency into the same frequency as the 480 MHz band satellite second intermediate frequency signal, and after the band selection, the second frequency converter converts the frequency to 118 MHz. A double super system that converts to an intermediate frequency signal is adopted. Further, when receiving a DSR broadcast by CATV, an oscillation signal from a local oscillation circuit for receiving a DSR broadcast by CATV is generated, and when receiving a DSR broadcast by a satellite, oscillation from a local oscillation circuit for receiving a DSR broadcast by a satellite. A switch circuit is added to select a signal and lead it to the first frequency converter.
【０００６】[0006]
【作用】本発明は、上記のように、衛星によるＤＳＲ放
送、ＣＡＴＶによるＤＳＲ放送どちらも第１の周波数変
換器と第２の周波数変換器により周波数変換を２回行う
こと、第１の周波数変換器で変換される信号の周波数を
衛星およびＣＡＴＶどちらも同一とすること、さらには
衛星によるＤＳＲ放送受信時とＣＡＴＶによるＤＳＲ放
送受信時とで第１の周波数変換回路に入力される局部発
振信号の発振信号を切り換えることにより、衛星による
ＤＳＲ放送受信用とＣＡＴＶによるＤＳＲ放送受信用の
第１の周波数変換器および第２の周波数変換器をそれぞ
れ共用化することが可能となり、ＣＡＴＶによるＤＳＲ
放送の多チャネル化に対応可能で、しかも衛星によるＤ
ＳＲ放送受信用とＣＡＴＶによるＤＳＲ放送受信用で大
部分の回路の共用化が図れることとなり、より小型なチ
ューナ装置を得ることができる。さらに第１の周波数変
換器により変換される中間周波信号周波数を約４８０Ｍ
Ｈｚ帯の衛星第２中間周波信号に設定したことにより、
容易に衛星テレビジョン放送の受信も可能である。ま
た、第２の周波数変換器に入力される局部発振信号の発
振周波数をＤＳＲ放送受信時とＣＡＴＶテレビジョン放
送受信時とで切り替えることにより、ＣＡＴＶテレビジ
ョン放送受信時には、地上波テレビジョン中間周波数
（欧州では３８.９ＭＨｚ）を出力することができ、Ｃ
ＡＴＶテレビジョン放送受信も可能となる。As described above, according to the present invention, the frequency conversion is performed twice by the first frequency converter and the second frequency converter in both the satellite DSR broadcasting and the CATV DSR broadcasting. The frequency of the signal converted by the converter is the same for both the satellite and CATV, and further, the local oscillation signal input to the first frequency conversion circuit when the DSR broadcast is received by the satellite and when the DTV broadcast is received by CATV. By switching the oscillation signal, it becomes possible to share the first frequency converter and the second frequency converter for receiving the DSR broadcast by the satellite and for receiving the DSR broadcast by the CATV, respectively.
Supports multi-channel broadcasting and D by satellite
Most circuits can be shared for SR broadcast reception and CATV DSR broadcast reception, and a smaller tuner device can be obtained. Further, the intermediate frequency signal frequency converted by the first frequency converter is set to about 480M.
By setting the satellite second intermediate frequency signal in the Hz band,
It is also possible to easily receive satellite television broadcasting. Further, by switching the oscillation frequency of the local oscillation signal input to the second frequency converter between the time of receiving the DSR broadcast and the time of receiving the CATV television broadcast, the terrestrial television intermediate frequency ( In Europe, it can output 38.9MHz, and C
It is also possible to receive ATV television broadcasting.
【０００７】[0007]
【実施例】以下本発明の第一の実施例を図１により説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.
【０００８】図１に示すチューナは衛星によるＤＳＲ放
送およびＣＡＴＶによるＤＳＲ放送が多チャネル化した
場合を考慮したチューナである。The tuner shown in FIG. 1 is a tuner in consideration of the case where the DSR broadcasting by satellite and the DSR broadcasting by CATV are multichannel.
【０００９】図１において、１００はチューナ装置、１
０１は水平偏波方式の衛星第１中間周波信号入力端子、
１０２は垂直偏波方式の衛星第１中間周波信号入力端
子、１０３は１０１および１０２に入力された衛星第１
中間周波信号を選択する切り替えスイッチ、１０４は１
ＧＨｚ帯の衛星第１中間周波信号を増幅するＲＦ増幅回
路、１０５は衛星第１中間周波信号の利得制御回路、１
０６は可変ＢＰＦ（バンドパスフィルタ）、１０７はＣ
ＡＴＶ信号入力端子、１０８は受信チャネル周波数に対
応して通過帯域周波数を切り替え可能なＢＰＦ、１０９
はＣＡＴＶ信号のＲＦ増幅回路、１１０はＣＡＴＶ信号
の利得制御回路、１１１はＢＰＦ、１１２は衛星第１中
間周波信号およびＣＡＴＶ信号を選択する切り替えスイ
ッチ、１１３は衛星第１中間周波信号用電圧制御局部発
振回路、１１４はＣＡＴＶ信号用電圧制御局部発振回
路、１１５は局部発振回路１１３および１１４からの発
振信号のうち１信号を選択する切り替えスイッチ、１１
６は第１の周波数変換回路、１１７は第１の周波数変換
回路１１６により衛星第２中間周波信号（欧州では４７
９.５ＭＨｚ）と等しい周波数に変換された信号（以
下、第３の中間周波信号）を増幅する中間周波信号増幅
回路、１１８は第３の中間周波信号帯のみを通過させる
ＢＰＦ、１１９は第３の電圧制御局部発振回路、１２０
は第３の中間周波信号を第２の中間周波信号に周波数変
換する第２の周波数変換回路、１２１は第２の中間周波
信号を増幅する中間周波信号増幅回路、１２２は第２の
中間周波信号のみを通過させるＢＰＦ、１２３はＢＰＦ
１２２から出力される信号を検波し、利得制御回路１０
５および１１０に加えるＡＧＣ電圧を出力するＡＧＣ電
圧出力回路、１２４は第２の中間周波信号を出力する出
力端子、１２５はＡＦＳ電圧入力端子、１２６は第２の
中間周波信号を音声信号に復調するＤＳＲ復調回路、１
２７はＤＳＲ復調回路１２６により復調された信号を出
力する出力端子、１２８は選局回路、１２９は選局信号
入力端子、１３０はＩＣで、切り替えスイッチ１１２、
１１５、第１の周波数変換回路１１６および中間周波信
号増幅回路１１７をＩＣ化している。In FIG. 1, 100 is a tuner device and 1 is a tuner device.
01 is a horizontal polarization type satellite first intermediate frequency signal input terminal,
Reference numeral 102 is a vertical polarization type satellite first intermediate frequency signal input terminal, and 103 is the satellite first primary frequency input to 101 and 102.
Selector switch for selecting intermediate frequency signal, 104 is 1
An RF amplifier circuit for amplifying the satellite first intermediate frequency signal in the GHz band, 105 a gain control circuit for the satellite first intermediate frequency signal, 1
06 is a variable BPF (band pass filter), 107 is C
ATV signal input terminal, 108 is a BPF capable of switching the pass band frequency corresponding to the reception channel frequency, 109
Is an RF amplification circuit for the CATV signal, 110 is a gain control circuit for the CATV signal, 111 is a BPF, 112 is a changeover switch for selecting the satellite first intermediate frequency signal and the CATV signal, and 113 is a voltage control local portion for the satellite first intermediate frequency signal. Oscillation circuit, 114 is a voltage control local oscillation circuit for CATV signal, 115 is a changeover switch for selecting one of oscillation signals from local oscillation circuits 113 and 114, 11
6 is a first frequency conversion circuit and 117 is a satellite second intermediate frequency signal (47
9.5 MHz) and an intermediate frequency signal amplifier circuit for amplifying a signal converted to a frequency equal to (9.5 MHz) (hereinafter, third intermediate frequency signal), 118 is a BPF that passes only the third intermediate frequency signal band, and 119 is a third Voltage control local oscillator circuit, 120
Is a second frequency conversion circuit that frequency-converts the third intermediate frequency signal into a second intermediate frequency signal, 121 is an intermediate frequency signal amplification circuit that amplifies the second intermediate frequency signal, and 122 is a second intermediate frequency signal BPF that only passes through, 123 is BPF
The signal output from 122 is detected and the gain control circuit 10
AGC voltage output circuit for outputting AGC voltage applied to 5 and 110, 124 an output terminal for outputting a second intermediate frequency signal, 125 an AFS voltage input terminal, 126 for demodulating the second intermediate frequency signal into an audio signal DSR demodulation circuit, 1
27 is an output terminal for outputting a signal demodulated by the DSR demodulation circuit 126, 128 is a channel selection circuit, 129 is a channel selection signal input terminal, 130 is an IC, and a changeover switch 112,
115, the first frequency conversion circuit 116 and the intermediate frequency signal amplification circuit 117 are integrated into an IC.
【００１０】図１で、衛星によるＤＳＲ放送を受信する
場合についてまず説明する。First, the case of receiving a DSR broadcast by satellite will be described with reference to FIG.
【００１１】選局信号が入力端子１２９に入力されるこ
とによって、ＤＳＲ放送のチャネル番号を選択し、選局
回路１２８は衛星第１中間周波信号のＲＦ増幅回路１０
４および衛星第１中間周波信号用発振回路１１３の電源
をオンとする。When the channel selection signal is input to the input terminal 129, the channel number of the DSR broadcast is selected, and the channel selection circuit 128 causes the RF amplification circuit 10 for the satellite first intermediate frequency signal.
4 and the satellite first intermediate frequency signal oscillation circuit 113 is turned on.
【００１２】入力端子１０１および１０２に入力した衛
星第１中間周波信号（欧州ＤＳＲ放送では、９５０〜１
７５０ＭＨｚ）を受信チャネルによりスイッチ１０３で
選択し、ＲＦ増幅回路１０４に入力する。ＲＦ増幅回路
１０４で増幅した衛星第１中間周波信号はＡＧＣ電圧出
力回路により制御する利得制御回路１０５で入力信号レ
ベルに応じて減衰し、可変ＢＰＦ１０６で帯域選択す
る。帯域選択した信号はスイッチ回路１１２を通して第
１の周波数変換回路１１６へ入力し、スイッチ回路１１
５を通して入力した衛星第１中間周波信号用局部発振回
路の発振信号で衛星第２中間周波信号（欧州では４７
９.５ＭＨｚ）と等しい周波数の第３の中間周波信号に
周波数変換した後、第１の中間周波信号増幅回路１１７
で増幅する。増幅した信号のうち第３の中間周波信号帯
のみをＢＰＦ１１８で選択通過させ、第２の周波数変換
回路１２０へ入力する。第２の周波数変換回路１２０に
入力した第３の中間周波信号と、ＡＦＳ電圧入力端子１
２５に入力する電圧で発振周波数を制御した局部発振回
路１１９の発振信号により第２の中間周波信号（欧州で
は１１８ＭＨｚ）に周波数変換し、周波数変換した信号
は第２の中間周波信号増幅回路１２１で増幅する。増幅
回路１２１で増幅した信号のうち第２の中間周波信号帯
のみをＢＰＦ１２２により通過させ、出力端子１２４に
出力する。このとき、ＢＰＦ１２２から出力した信号は
ＡＧＣ電圧出力回路１２３に入力し、ここで入力した信
号の信号レベルに対応したＡＧＣ電圧を発生すること
で、衛星によるＤＳＲ放送受信時には利得制御回路１０
５の制御を、ＣＡＴＶ信号によるＤＳＲ放送受信時には
利得制御回路１１０の制御を行う。また、出力端子１２
４から出力した第２の中間周波信号は、ＤＳＲ復調回路
１２６に入力する。ＤＳＲ復調回路１２６では、第３の
局部発振回路の発振周波数を制御するＡＦＳ電圧をＡＦ
Ｓ電圧入力端子１２５へ出力するとともに、第２の中間
周波信号を復調し出力端子１２７へ音声信号を出力す
る。The satellite first intermediate frequency signal input to the input terminals 101 and 102 (950-1 in European DSR broadcasting)
750 MHz) is selected by the switch 103 according to the reception channel and input to the RF amplifier circuit 104. The satellite first intermediate frequency signal amplified by the RF amplifier circuit 104 is attenuated according to the input signal level by the gain control circuit 105 controlled by the AGC voltage output circuit, and the band is selected by the variable BPF 106. The band-selected signal is input to the first frequency conversion circuit 116 through the switch circuit 112 and the switch circuit 11
5 is the oscillation signal of the local oscillation circuit for the satellite 1st intermediate frequency signal, which is the satellite 2nd intermediate frequency signal.
Frequency conversion to a third intermediate frequency signal having a frequency equal to 9.5 MHz), and then the first intermediate frequency signal amplifier circuit 117.
Amplify with. Only the third intermediate frequency signal band of the amplified signal is selectively passed by the BPF 118 and input to the second frequency conversion circuit 120. The third intermediate frequency signal input to the second frequency conversion circuit 120 and the AFS voltage input terminal 1
The frequency is converted into a second intermediate frequency signal (118 MHz in Europe) by the oscillation signal of the local oscillation circuit 119 whose oscillation frequency is controlled by the voltage input to 25, and the frequency-converted signal is output by the second intermediate frequency signal amplifier circuit 121. Amplify. Among the signals amplified by the amplifier circuit 121, only the second intermediate frequency signal band is passed by the BPF 122 and output to the output terminal 124. At this time, the signal output from the BPF 122 is input to the AGC voltage output circuit 123, and the AGC voltage corresponding to the signal level of the signal input here is generated, so that the gain control circuit 10 receives the DSR broadcast by the satellite.
5, the gain control circuit 110 is controlled at the time of receiving the DSR broadcast by the CATV signal. Also, the output terminal 12
The second intermediate frequency signal output from No. 4 is input to the DSR demodulation circuit 126. In the DSR demodulation circuit 126, the AFS voltage that controls the oscillation frequency of the third local oscillation circuit is set to AF.
It outputs to the S voltage input terminal 125, demodulates the second intermediate frequency signal, and outputs an audio signal to the output terminal 127.
【００１３】ＣＡＴＶによるＤＳＲ放送受信時には選局
回路１２８は、ＣＡＴＶ信号のＲＦ増幅回路１０９およ
びＣＡＴＶ信号用局部発振回路１１４の電源をオンとす
る。When receiving a DSR broadcast by CATV, the channel selection circuit 128 turns on the power of the RF amplification circuit 109 for CATV signals and the local oscillation circuit 114 for CATV signals.
【００１４】入力端子１０７に入力したＣＡＴＶ信号
（欧州ＤＳＲ放送では、１１０〜３００ＭＨｚ）は、歪
特性改善のために設けた通過帯域周波数を受信チャネル
に応じて切り替え可能なＢＰＦ１０８により帯域選択
し、ＲＦ増幅回路１０９で増幅した後、ＡＧＣ電圧出力
回路からのＡＧＣ電圧で制御する利得制御回路１１０で
入力信号レベルに応じ減衰した信号はさらにＢＰＦ１１
１で帯域選択する。帯域選択した信号はスイッチ回路１
１２を通して第１の周波数変換回路１１６へ入力し、ス
イッチ回路１１５を通して入力するＣＡＴＶ信号用局部
発振回路１１４の発振信号で衛星第２中間周波信号（欧
州では４７９.５ＭＨｚ）と等しい第３の中間周波信号
に周波数変換し、以下衛星によるＤＳＲ放送を受信する
場合と同様な動作を行う。The CATV signal (110 to 300 MHz in European DSR broadcasting) input to the input terminal 107 is band-selected by the BPF 108 capable of switching the pass band frequency provided for improving the distortion characteristic according to the receiving channel, and RF After being amplified by the amplifier circuit 109, the signal which is attenuated according to the input signal level by the gain control circuit 110 which is controlled by the AGC voltage from the AGC voltage output circuit is further BPF11.
The band is selected with 1. The band selected signal is the switch circuit 1
The third intermediate frequency equal to the satellite second intermediate frequency signal (479.5 MHz in Europe) is the oscillation signal of the CATV signal local oscillation circuit 114 that is input to the first frequency conversion circuit 116 through 12 and is input through the switch circuit 115. The same operation as in the case where the frequency is converted into a signal and the DSR broadcast by the satellite is received is performed.
【００１５】なお、衛星によるＤＳＲ放送受信する場合
において、１段の周波数変換器で１ＧＨｚ帯の衛星第１
中間周波数を例えば１１８ＭＨｚに周波数変換しようと
した場合、１ＧＨｚのイメージ周波数が１０００＋１１
８×２＝１２３６ＭＨｚとなり、衛星第１中間周波数付
近となるため、十分なイメージ妨害除去特性を得ること
はできない。In the case of receiving a DSR broadcast from a satellite, the 1 GHz band satellite 1
If the intermediate frequency is converted to 118 MHz, for example, the image frequency of 1 GHz is 1000 + 11.
Since 8 × 2 = 1236 MHz, which is near the first intermediate frequency of the satellite, sufficient image interference removal characteristics cannot be obtained.
【００１６】本実施例では周波数変換器を２つ設け、２
段階でダウンコンバートする方式とすることで、十分な
イメージ妨害除去特性が得られるようにした。In this embodiment, two frequency converters are provided and 2
By adopting the method of down-converting at the stage, it was possible to obtain sufficient image interference removal characteristics.
【００１７】また、ＣＡＴＶによるＤＳＲ放送を受信す
る場合において、チューナ装置に入力するＲＦ信号（欧
州では１１０〜３００ＭＨｚ）と復調回路に出力する中
間周波信号（欧州では中心周波数１１８ＭＨｚ）が近い
ため１つの周波数変換器で変換しようとした場合、局部
発振信号周波数が０〜４０４ＭＨｚとなる。しかし、こ
のように可変変化比が非常に大きい発振器を構成するこ
とは容易ではない。したがって、本実施例のように、第
１の周波数変換器でＣＡＴＶによるＤＳＲ放送のＲＦ信
号よりも高い周波数、たとえば、４００ＭＨｚ帯あるい
はＣＡＴＶ用コンバータの第１中間周波数信号帯に一度
アップコンバートし、帯域選択後、第２の周波数変換器
で１００ＭＨｚ帯の中間周波信号にダウンコンバートす
ることにより、多チャネル化されたＣＡＴＶによるＤＳ
Ｒ放送も受信を可能とし、この場合、規格化された中間
周波信号周波数帯を選択することにより、チューナ外部
からスプリアス妨害を受けにくいチューナ特性が得られ
る。また、衛星およびＣＡＴＶによるＤＳＲ放送受信用
の周波数変換器を共用化することで構成部品の共用化が
図れ、さらに、第１の周波数変換器およびその周辺回路
をＩＣ化することにより、より小型で、量産性に優れた
チューナ装置を得ることができる。Further, when receiving a DSR broadcast by CATV, the RF signal input to the tuner device (110 to 300 MHz in Europe) and the intermediate frequency signal output to the demodulation circuit (center frequency 118 MHz in Europe) are close to each other. If the frequency converter tries to convert, the local oscillation signal frequency becomes 0 to 404 MHz. However, it is not easy to construct an oscillator having such a large variable change ratio. Therefore, as in this embodiment, the first frequency converter once up-converts to a frequency higher than the RF signal of DSR broadcasting by CATV, for example, the 400 MHz band or the first intermediate frequency signal band of the CATV converter, After the selection, the second frequency converter down-converts the signal into an intermediate frequency signal in the 100 MHz band, and thus the DS by the CATV in which multiple channels are formed.
R broadcasting can also be received. In this case, by selecting a standardized intermediate frequency signal frequency band, a tuner characteristic that is less susceptible to spurious interference from outside the tuner can be obtained. Further, by sharing the frequency converter for receiving the DSR broadcast by the satellite and CATV, it is possible to share the components, and by further integrating the first frequency converter and its peripheral circuits into an IC, the size can be made smaller. Therefore, it is possible to obtain a tuner device having excellent mass productivity.
【００１８】次に本発明の第二の実施例を図２により説
明する。Next, a second embodiment of the present invention will be described with reference to FIG.
【００１９】図２において、図１と同様の動作を行うも
のは図１と同じ番号を付し、説明を省略する。同図にお
いて、２０１は分波回路である。In FIG. 2, the same elements as those in FIG. 1 perform the same operations as those in FIG. 1, and the description thereof will be omitted. In the figure, 201 is a demultiplexing circuit.
【００２０】図２で、衛星によるＤＳＲ放送を受信する
場合についてまず説明する。First, the case of receiving DSR broadcasting by satellite will be described with reference to FIG.
【００２１】入力端子１０１および１０２に入力したＣ
ＡＴＶ信号と衛星第１中間周波信号を重畳した信号は受
信チャネルにより切り替えスイッチ１０３で選択し、分
波回路２０１に入力する。分波回路２０１に入力した信
号のうち衛星第１中間周波信号帯をＲＦ増幅回路１０４
に入力する。以下、第１の実施例と同様の動作を行う。C input to the input terminals 101 and 102
A signal obtained by superimposing the ATV signal and the satellite first intermediate frequency signal is selected by the changeover switch 103 according to the reception channel and input to the demultiplexing circuit 201. Of the signals input to the demultiplexing circuit 201, the satellite first intermediate frequency signal band is set to the RF amplification circuit 104.
To enter. Hereinafter, the same operation as that of the first embodiment is performed.
【００２２】ＣＡＴＶによるＤＳＲ放送を受信する場
合、ＣＡＴＶ信号が重畳された信号が入力される入力端
子１０１あるいは１０２のうちＣＡＴＶ信号が重畳され
ている方の信号を切り替えスイッチ１０３で選択し、分
波回路２０１に入力する。分波回路２０１に入力した信
号のうちＣＡＴＶ信号帯をＢＰＦ１０８に入力し、以
下、第一の実施例と同様の動作を行う。When receiving a DSR broadcast by CATV, one of the input terminals 101 or 102 to which the signal on which the CATV signal is superimposed is input is selected by the change-over switch 103 and the demultiplexer is selected. Input to the circuit 201. The CATV signal band of the signals input to the demultiplexing circuit 201 is input to the BPF 108, and thereafter, the same operation as that of the first embodiment is performed.
【００２３】以上、本実施例によれば、衛星第１中間周
波信号にＣＡＴＶ信号が重畳された場合でも受信が可能
となる。このように衛星第１中間周波信号系とＣＡＴＶ
信号系が１系統であっても、図１に示した実施例のよう
に２系統であっても受信が可能であり、使い勝手性に優
れたチューナ装置を得ることができる。As described above, according to the present embodiment, reception is possible even when the CATV signal is superimposed on the satellite first intermediate frequency signal. Thus, the satellite first intermediate frequency signal system and the CATV
Even if the signal system is one system or two systems as in the embodiment shown in FIG. 1, reception is possible, and a tuner device excellent in usability can be obtained.
【００２４】次に本発明の第三の実施例を図３により説
明する。Next, a third embodiment of the present invention will be described with reference to FIG.
【００２５】図３に示すチューナは衛星によるＤＳＲ放
送およびＣＡＴＶによるＤＳＲ放送が多チャネル化した
場合も考慮し、かつ従来の衛星テレビジョン放送および
ＣＡＴＶのテレビジョン放送の受信も可能なチューナ装
置である。The tuner shown in FIG. 3 is a tuner device that takes into consideration the case where the DSR broadcasting by the satellite and the DSR broadcasting by the CATV are multi-channeled and can also receive the conventional satellite television broadcasting and CATV television broadcasting. .
【００２６】図３において、第１の実施例と同様の動作
を行うものは同じ番号を付し、説明を略す。同図におい
て、３０１は衛星テレビジョン放送受信用のＡＧＣ電圧
を入力する入力端子、３０２は衛星によるＤＳＲ放送受
信用のＡＧＣ電圧を入力する入力端子、３０３はＣＡＴ
Ｖテレビジョン放送受信用のＡＧＣ電圧を入力する入力
端子、３０４はＣＡＴＶによるＤＳＲ放送受信用のＡＧ
Ｃ電圧を入力する入力端子、３０５は衛星によるＤＳＲ
放送受信時には衛星によるＤＳＲ放送受信用のＡＧＣ電
圧入力端子３０２に入力された電圧を、衛星テレビジョ
ン放送受信時には衛星テレビジョン放送受信用のＡＧＣ
電圧入力端子３０１に入力された電圧を利得制御回路１
０５に加えるように動作する切り替えスイッチ、３０６
はＣＡＴＶによるＤＳＲ放送受信時にはＣＡＴＶによる
ＤＳＲ放送受信用のＡＧＣ電圧入力端子３０４に入力さ
れた電圧を、ＣＡＴＶテレビジョン放送受信時にはＣＡ
ＴＶテレビジョン放送受信用のＡＧＣ電圧入力端子３０
３に入力された電圧を利得制御回路１１０に加わるよう
に動作する切り替えスイッチ、３０７は第３の中間周波
信号を衛星テレビジョン放送受信時と、ＤＳＲ放送ある
いはＣＡＴＶテレビジョン放送受信時とで切り替えるス
イッチ回路、３０８はＣＡＴＶテレビジョン放送受信時
とＤＳＲ放送受信時と発振周波数が切り替え可能であ
り、かつ発振周波数が制御可能な局部発振回路、３０９
は第２の中間周波信号（欧州では１１８ＭＨｚ）とＣＡ
ＴＶテレビジョン中間周波信号（欧州では３８.９ＭＨ
ｚ）を分波する分波回路、３１０はＣＡＴＶテレビジョ
ン中間周波信号帯を通過させるＢＰＦ、３１１はＣＡＴ
Ｖテレビジョン中間周波信号を出力する出力端子、３１
２は衛星第２中間周波信号帯の衛星テレビジョン信号を
出力する出力端子、３１３はＣＡＴＶテレビジョン信号
を復調するＣＡＴＶテレビジョン信号復調回路、３１４
はＣＡＴＶテレビジョン信号復調回路３１３で復調され
た映像信号を出力する出力端子、３１５は衛星テレビジ
ョン放送を復調する衛星テレビジョン信号復調回路、３
１６は衛星テレビジョンのベースバンド信号出力端子、
３１７はＩＣで、切り替えスイッチ１１２、１１５、第
１の周波数変換回路１１６、中間周波信号増幅回路１１
７、衛星第１中間周波信号用電圧制御局部発振回路１１
３およびＣＡＴＶ信号用電圧制御局部発振回路１１４を
ＩＣ化している。In FIG. 3, the same operations as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 301 is an input terminal for inputting an AGC voltage for satellite television broadcast reception, 302 is an input terminal for inputting an AGC voltage for satellite DSR broadcast reception, and 303 is a CAT.
An input terminal for inputting an AGC voltage for receiving V television broadcasting, and 304 for an AG for receiving DSR broadcasting by CATV
Input terminal for inputting C voltage, 305 is satellite DSR
The voltage input to the AGC voltage input terminal 302 for receiving the DSR broadcast by the satellite at the time of receiving the broadcast is the AGC for receiving the satellite television broadcast at the time of receiving the satellite television broadcast.
The gain control circuit 1 controls the voltage input to the voltage input terminal 301.
Changeover switch 306 that operates to add to 05
Is the voltage input to the AGC voltage input terminal 304 for receiving the DSR broadcast by the CATV when receiving the DSR broadcast by the CATV, and the CA when receiving the CATV television broadcast.
AGC voltage input terminal 30 for receiving TV television broadcasting
A switch for operating so that the voltage input to the circuit 3 is applied to the gain control circuit 110, and 307 is a switch for switching the third intermediate frequency signal between reception of satellite television broadcast and reception of DSR broadcast or CATV television broadcast. A circuit, 308 is a local oscillation circuit capable of switching the oscillation frequency and controlling the oscillation frequency when receiving CATV television broadcast and when receiving DSR broadcast, 309
Is the second intermediate frequency signal (118 MHz in Europe) and CA
TV television intermediate frequency signal (38.9 MHz in Europe)
z), a demultiplexing circuit that demultiplexes z), 310 a BPF that allows the CATV television intermediate frequency signal band to pass, and 311 a CAT.
Output terminal for outputting V television intermediate frequency signal, 31
2 is an output terminal for outputting a satellite television signal in the satellite second intermediate frequency signal band; 313 is a CATV television signal demodulating circuit for demodulating a CATV television signal;
Is an output terminal for outputting the video signal demodulated by the CATV television signal demodulation circuit 313, and 315 is a satellite television signal demodulation circuit for demodulating satellite television broadcasting.
16 is a satellite television baseband signal output terminal,
Reference numeral 317 is an IC, which includes changeover switches 112 and 115, a first frequency conversion circuit 116, and an intermediate frequency signal amplification circuit 11
7, satellite first intermediate frequency signal voltage control local oscillation circuit 11
3 and the CATV signal voltage control local oscillation circuit 114 are integrated into an IC.
【００２７】図３で、ＤＳＲ放送を受信する場合につい
てまず説明する。First, the case of receiving the DSR broadcast will be described with reference to FIG.
【００２８】選局信号が入力端子１２９に入力すること
によって、ＤＳＲ放送のチャネル番号を選択し、選局回
路１２８は、ＤＳＲ復調回路１２６からのＡＧＣ電圧を
利得制御回路１０５および１１０に加えるように切り替
えスイッチ３０５および３０６を切り替える。また、局
部発振回路３０８の発振周波数を第２の中間周波信号周
波数が、ＤＳＲ放送受信周波数となるような発振周波数
（３６１.５ＭＨｚ）に切り替える。このとき、衛星に
よるＤＳＲ放送を受信する場合には、さらに選局回路１
２８は衛星第１中間周波信号のＲＦ増幅回路１０４およ
び衛星第１中間周波信号用局部発振回路１１３の電源を
オンとする。The channel selection signal is input to the input terminal 129 to select the channel number of the DSR broadcast, and the channel selection circuit 128 applies the AGC voltage from the DSR demodulation circuit 126 to the gain control circuits 105 and 110. The changeover switches 305 and 306 are changed over. Further, the oscillation frequency of the local oscillation circuit 308 is switched to the oscillation frequency (361.5 MHz) such that the second intermediate frequency signal frequency becomes the DSR broadcast reception frequency. At this time, when receiving the DSR broadcast by the satellite, the tuning circuit 1
28 turns on the power sources of the RF amplification circuit 104 for the satellite first intermediate frequency signal and the local oscillation circuit 113 for the satellite first intermediate frequency signal.
【００２９】入力端子１０１および１０２に入力した衛
星第１中間周波信号のうちの一方を受信チャネルにより
切り替えスイッチ１０３で選択し、ＲＦ増幅回路１０４
に入力する。ＲＦ増幅回路１０４で入力した信号を増幅
し、衛星第１中間周波信号はＤＳＲ復調回路１２６によ
り制御される利得制御回路１０５で入力信号レベルに応
じ減衰し、可変ＢＰＦ１０６により帯域選択する。帯域
選択した信号はスイッチ回路１１２を通して第１の周波
数変換回路１１６へ入力し、スイッチ回路１１５を通し
て入力した衛星によるＤＳＲ放送受信用局部発振回路１
１３の発振信号により衛星第２中間周波信号（欧州では
４７９.５ＭＨｚ）と等しい第３の中間周波信号に周波
数変換する。第３の中間周波信号に周波数変換した信号
を第１の中間周波信号増幅回路１１７で増幅し、ＢＰＦ
１１８で第３の中間周波信号帯のみを通過させ、切り替
えスイッチ３０７で第２の周波数変換回路１２０へ入力
する。第２の周波数変換回路１２０に入力した第３の中
間周波信号と、局部発振回路３０８の発振信号により第
２の中間周波信号（欧州では１１８ＭＨｚ）に周波数変
換し、第２の中間周波信号増幅回路１２１で増幅し、分
波回路３０９に入力する。分波回路３０９では第２の中
間周波信号をＢＰＦ１２２に入力し、ＢＰＦ１２２では
第２の中間周波信号帯のみを通過させ、出力端子１２４
へ出力し、ＤＳＲ復調回路１２６に入力する。ＤＳＲ復
調回路１２６では、入力信号レベルにより衛星によるＤ
ＳＲ放送受信時には利得制御回路１０５の制御を、ＣＡ
ＴＶによるＤＳＲ放送受信時には利得制御回路１１０の
制御を行うとともに、局部発振回路３０８の発振周波数
を制御し、出力端子１２７へ復調した音声信号を出力す
る。One of the satellite first intermediate frequency signals input to the input terminals 101 and 102 is selected by the changeover switch 103 by the receiving channel, and the RF amplifying circuit 104 is selected.
To enter. The signal input by the RF amplifier circuit 104 is amplified, the satellite first intermediate frequency signal is attenuated according to the input signal level by the gain control circuit 105 controlled by the DSR demodulation circuit 126, and the band is selected by the variable BPF 106. The band-selected signal is input to the first frequency conversion circuit 116 through the switch circuit 112, and is input through the switch circuit 115 to the satellite local DSR broadcast receiving local oscillation circuit 1
The frequency of the oscillation signal of 13 is converted into a third intermediate frequency signal equal to the satellite second intermediate frequency signal (479.5 MHz in Europe). The signal, which has been frequency-converted into the third intermediate frequency signal, is amplified by the first intermediate frequency signal amplifier circuit 117, and the BPF
At 118, only the third intermediate frequency signal band is passed, and at the changeover switch 307, it is input to the second frequency conversion circuit 120. The third intermediate frequency signal input to the second frequency conversion circuit 120 and the oscillation signal of the local oscillation circuit 308 are frequency-converted into a second intermediate frequency signal (118 MHz in Europe), and a second intermediate frequency signal amplification circuit. The signal is amplified by 121 and input to the demultiplexing circuit 309. The demultiplexing circuit 309 inputs the second intermediate frequency signal to the BPF 122, the BPF 122 passes only the second intermediate frequency signal band, and the output terminal 124
To the DSR demodulation circuit 126. In the DSR demodulation circuit 126, D depending on the input signal level
When the SR broadcast is received, the gain control circuit 105 is controlled by the CA
When the DSR broadcast is received by the TV, the gain control circuit 110 is controlled, the oscillation frequency of the local oscillation circuit 308 is controlled, and the demodulated audio signal is output to the output terminal 127.
【００３０】ＣＡＴＶによるＤＳＲ放送受信時には選局
回路１２８は、ＣＡＴＶ信号のＲＦ増幅回路１０９およ
びＣＡＴＶ信号用発振回路１１４の電源をオンとする。When receiving DSR broadcasting by CATV, the tuning circuit 128 turns on the RF amplification circuit 109 for CATV signals and the CATV signal oscillation circuit 114.
【００３１】入力端子１０７に入力したＣＡＴＶ信号
は、通過帯域周波数を受信チャネルに応じて切り替え可
能なＢＰＦ１０８により帯域選択し、ＲＦ増幅回路１０
９に入力する。ＲＦ増幅回路１０９に入力した信号を増
幅した後、ＤＳＲ復調回路１２６により制御する利得制
御回路１１０で入力信号レベルに応じ減衰し、ＢＰＦ１
１１で帯域選択した後、スイッチ回路１１２を通して第
１の周波数変換回路１１６へ入力し、スイッチ回路１１
５を通して入力したＣＡＴＶ信号用局部発振回路１１４
の発振信号により衛星第２中間周波信号（欧州では４７
９.５ＭＨｚ）と等しい第３の中間周波信号に周波数変
換し、以下衛星によるＤＳＲ放送を受信と同様な動作を
行う。The CATV signal input to the input terminal 107 is band-selected by the BPF 108 whose pass band frequency can be switched according to the reception channel, and the RF amplifier circuit 10 is selected.
Enter in 9. After amplifying the signal input to the RF amplification circuit 109, the gain control circuit 110 controlled by the DSR demodulation circuit 126 attenuates it according to the input signal level, and BPF1
After selecting the band in 11, the frequency is input to the first frequency conversion circuit 116 through the switch circuit 112, and the switch circuit 11
Local oscillation circuit 114 for CATV signal input through 5
2nd intermediate frequency signal (47
The frequency is converted into a third intermediate frequency signal equal to 9.5 MHz), and the same operation as receiving the DSR broadcast by the satellite is performed.
【００３２】次に衛星テレビジョン放送を受信する場合
について説明する。Next, the case of receiving satellite television broadcasting will be described.
【００３３】選局信号が入力端子１２９に入力されるこ
とによって、衛星テレビジョン放送のチャネル番号を選
択し、選局回路１２８は衛星テレビジョン信号復調回路
３１５からのＡＧＣ電圧が利得制御回路１０５に加わる
ように切り替えスイッチ３０５を切り替える。When the channel selection signal is input to the input terminal 129, the channel number of the satellite television broadcast is selected, and the channel selection circuit 128 causes the gain control circuit 105 to receive the AGC voltage from the satellite television signal demodulation circuit 315. The changeover switch 305 is changed so as to join.
【００３４】入力端子１０１および１０２に入力された
衛星第１中間周波信号のうちどちらか一方を受信チャネ
ルにより切り替えスイッチ１０３で選択し、ＲＦ増幅回
路１０４に入力する。ＲＦ増幅回路１０４に入力した信
号を増幅した後、衛星テレビジョン放送復調回路３１５
により制御する利得制御回路１０５で入力信号レベルに
応じ減衰され、可変ＢＰＦ１０６で帯域選択する。帯域
選択した信号はスイッチ回路１１２を通して第１の周波
数変換回路１１６へ入力し、スイッチ回路１１５を通し
て入力した衛星第１中間周波信号用局部発振回路１１３
の発振信号により衛星第２中間周波信号と等しい第３の
中間周波信号に周波数変換し、第１の中間周波信号増幅
回路１１７に入力する。第１の中間周波信号増幅回路１
１７に入力した信号を増幅した後、ＢＰＦ１１８により
第３の中間周波信号帯のみを通過させ、切り替えスイッ
チ３０７で衛星テレビジョン信号出力端子３１２を介
し、衛星テレビジョン信号復調回路３１５に入力する。
衛星テレビジョン信号復調回路３１５では、入力レベル
により衛星テレビジョン放送受信時には利得制御回路１
０５の制御を行うとともに、出力端子３１６へ復調され
たベースバンド信号を出力する。Either one of the satellite first intermediate frequency signals input to the input terminals 101 and 102 is selected by the changeover switch 103 according to the receiving channel and input to the RF amplifier circuit 104. After amplifying the signal input to the RF amplifier circuit 104, a satellite television broadcast demodulation circuit 315
The gain control circuit 105 controlled by the signal is attenuated according to the input signal level, and the variable BPF 106 selects the band. The band-selected signal is input to the first frequency conversion circuit 116 through the switch circuit 112, and is input through the switch circuit 115 to the satellite first intermediate frequency signal local oscillation circuit 113.
Is converted into a third intermediate frequency signal equal to the second intermediate frequency signal of the satellite and input to the first intermediate frequency signal amplifier circuit 117. First intermediate frequency signal amplifier circuit 1
After amplifying the signal input to 17, the BPF 118 allows only the third intermediate frequency signal band to pass, and is input to the satellite television signal demodulation circuit 315 via the satellite television signal output terminal 312 by the changeover switch 307.
In the satellite television signal demodulation circuit 315, the gain control circuit 1 is used when satellite television broadcasting is received, depending on the input level.
In addition to the control of 05, the demodulated baseband signal is output to the output terminal 316.
【００３５】次にＣＡＴＶテレビジョン放送を受信する
場合について説明する。Next, the case of receiving a CATV television broadcast will be described.
【００３６】選局信号が入力端子１２９に入力されるこ
とによって、ＣＡＴＶテレビジョン放送のチャネル番号
を選択し、選局回路１２８はＣＡＴＶテレビジョン信号
復調回路３１３からのＡＧＣ電圧利得制御回路１１０に
加わるように切り替えスイッチ３０６を切り替える。ま
た、ＣＡＴＶ信号のＲＦ増幅回路１０９およびＣＡＴＶ
信号用発振回路１１４の電源をオンとし、さらに局部発
振回路３０８の発振周波数を第２の中間周波信号周波数
がＣＡＴＶテレビジョン放送受信周波数と等しくなるよ
うな発振周波数（４４２.８５ＭＨｚ）に切り替える。When the channel selection signal is input to the input terminal 129, the channel number of the CATV television broadcast is selected, and the channel selection circuit 128 is added to the AGC voltage gain control circuit 110 from the CATV television signal demodulation circuit 313. Thus, the changeover switch 306 is changed over. In addition, the RF amplification circuit 109 for the CATV signal and the CATV
The power of the signal oscillating circuit 114 is turned on, and the oscillating frequency of the local oscillating circuit 308 is switched to an oscillating frequency (442.85 MHz) such that the second intermediate frequency signal frequency becomes equal to the CATV television broadcast receiving frequency.
【００３７】入力端子１０７に入力した、ＣＡＴＶ地上
波テレビジョン信号は、通過帯域周波数を受信チャネル
に応じて切り替え可能なＢＰＦ１０８により帯域選択
し、ＲＦ増幅回路１０９で増幅した後、ＣＡＴＶテレビ
ジョン信号復調回路３１３により制御される利得制御回
路１１０で入力信号レベルに応じ減衰させた信号を、ス
イッチ回路１１２を通して第１の周波数変換回路１１６
へ入力し、スイッチ回路１１５を通して入力したＣＡＴ
Ｖ信号用局部発振回路１１４の発振信号により第３の中
間周波信号に周波数変換する。周波数変換した信号は、
第１の中間周波信号増幅回路１１７で増幅し、ＢＰＦ１
１８で第３の中間周波信号帯のみを帯域選択した後、切
り替えスイッチ３０７を介し、第２の周波数変換回路１
２０へ入力する。第２の周波数変換回路１２０に入力し
た第３の中間周波信号と、局部発振回路３０８の発振信
号によりＣＡＴＶテレビジョン放送中間周波信号（欧州
では３８.９ＭＨｚ）と等しい第２の中間周波信号に周
波数変換し、第２の中間周波信号増幅回路１２１により
増幅した後、分波回路３０９に入力する。分波回路３０
９では第２の中間周波信号をＢＰＦ３１０に入力し、Ｂ
ＰＦ３１０では第２の中間周波信号帯のみを帯域選択
し、出力端子３１１を介しＣＡＴＶテレビジョン信号復
調回路３１３に入力する。ＣＡＴＶテレビジョン信号復
調回路３１３では、入力レベルにより利得制御回路１１
０の制御を行うとともに、出力端子３１４へ復調された
映像信号を出力する。The CATV terrestrial television signal input to the input terminal 107 is band-selected by the BPF 108 whose pass band frequency can be switched according to the receiving channel, amplified by the RF amplifier circuit 109, and then demodulated by the CATV television signal. The signal attenuated according to the input signal level in the gain control circuit 110 controlled by the circuit 313 is passed through the switch circuit 112 to the first frequency conversion circuit 116.
Input to the CAT and input through the switch circuit 115
The oscillation signal from the V signal local oscillation circuit 114 is frequency-converted into a third intermediate frequency signal. The frequency converted signal is
The first intermediate frequency signal amplifier circuit 117 amplifies the signal, and the BPF1
After band selection of only the third intermediate frequency signal band at 18, the second frequency conversion circuit 1 is switched through the changeover switch 307.
Enter to 20. By the third intermediate frequency signal input to the second frequency conversion circuit 120 and the oscillation signal of the local oscillation circuit 308, the frequency is converted into a second intermediate frequency signal equal to the CATV television broadcast intermediate frequency signal (38.9 MHz in Europe). After being converted and amplified by the second intermediate frequency signal amplifier circuit 121, it is input to the demultiplexing circuit 309. Branching circuit 30
In 9, the second intermediate frequency signal is input to the BPF 310, and B
The PF 310 selects only the second intermediate frequency signal band and inputs it to the CATV television signal demodulation circuit 313 via the output terminal 311. In the CATV television signal demodulation circuit 313, the gain control circuit 11 depends on the input level.
The output signal 314 is controlled to 0 and the demodulated video signal is output to the output terminal 314.
【００３８】以上、本実施例によれば第１の周波数変換
器により変換される中間周波信号周波数を４８０ＭＨｚ
帯の衛星第２中間周波信号に設定したことにより、容易
に衛星テレビジョン放送の受信ができるようにした。ま
た、第２の周波数変換器に入力される局部発振信号の発
振周波数をＤＳＲ放送受信時とＣＡＴＶテレビジョン放
送受信時とで切り替えることにより、ＣＡＴＶテレビジ
ョン放送を受信するときは、ＣＡＴＶテレビジョン中間
周波数（欧州では３８.９ＭＨｚ）を周波数変換出力す
ることにより、ＣＡＴＶテレビジョン放送受信も容易に
できるようにした。なお、実施例１では、切り替えスイ
ッチ１１２、１１５、第１の周波数変換回路１１６およ
び中間周波信号増幅回路１１７をＩＣ化した場合を示し
たが、本実施例のように、さらに衛星第１中間周波信号
用電圧制御発振回路１１３およびＣＡＴＶ信号用電圧制
御発振回路１１４もＩＣ化することも可能である。また
ＤＳＲ放送に用いられる周波数変換器を衛星テレビジョ
ンおよびＣＡＴＶテレビジョン放送受信時にも共用化す
ることで構成部品の共用化が図れることとなり、より小
型で使い勝手性がよいチューナ装置を得ることができ
る。As described above, according to this embodiment, the intermediate frequency signal frequency converted by the first frequency converter is 480 MHz.
By setting the satellite second intermediate frequency signal of the band, it is possible to easily receive satellite television broadcasting. When the CATV television broadcast is received by switching the oscillation frequency of the local oscillation signal input to the second frequency converter between when the DSR broadcast is received and when the CATV television broadcast is received, the CATV television intermediate By converting and outputting the frequency (38.9 MHz in Europe), CATV television broadcasting can be easily received. In the first embodiment, the changeover switches 112, 115, the first frequency conversion circuit 116, and the intermediate frequency signal amplification circuit 117 are shown as an IC. However, as in the present embodiment, the satellite first intermediate frequency is further added. The signal voltage controlled oscillator circuit 113 and the CATV signal voltage controlled oscillator circuit 114 can also be integrated into an IC. In addition, by sharing the frequency converter used for DSR broadcasting even when receiving satellite television and CATV television broadcasting, the components can be shared, and a tuner device with a smaller size and better usability can be obtained. .
【００３９】[0039]
【発明の効果】以上述べてきたように本発明によれば、
衛星による音声放送もＣＡＴＶによる音声放送も受信可
能であるだけでなく、衛星放送受信時においても、ＣＡ
ＴＶ受信時においても共用した周波数変換器で周波数変
換を２段に分けて行うことにより、従来考慮されていな
かったＣＡＴＶによる音声放送の多チャネル化にも対応
できるだけでなく、回路構成が簡単でしかも使い勝手性
がよいチューナ装置を得ることができる。また、周波数
変換器により変換出力される中間周波数を衛星第２中間
周波信号周波数あるいは地上テレビジョン中間周波信号
周波数に等しい周波数に設定することにより、衛星テレ
ビジョンおよびＣＡＴＶテレビジョン放送を容易に受信
することができる。As described above, according to the present invention,
Not only is it possible to receive both satellite and CATV audio broadcasts, but also when receiving satellite broadcasts, CA
By performing frequency conversion in two stages with the shared frequency converter even during TV reception, not only can the multi-channel audio broadcasting by CATV, which has not been considered in the past, can be supported, and the circuit configuration is simple. A tuner device with good usability can be obtained. Further, by setting the intermediate frequency converted and output by the frequency converter to a frequency equal to the satellite second intermediate frequency signal frequency or the terrestrial television intermediate frequency signal frequency, satellite television and CATV television broadcasting can be easily received. be able to.
【図１】本発明の第１の実施例を示すブロック図であ
る。FIG. 1 is a block diagram showing a first embodiment of the present invention.
【図２】第２の実施例を示すブロック図である。FIG. 2 is a block diagram showing a second embodiment.
【図３】第３の実施例を示すブロック図である。FIG. 3 is a block diagram showing a third embodiment.
104,109…ＲＦ増幅回路、 118,122,310…バンドパスフィルタ、 116,120…周波数変換回路、 113,114,119,308…電圧制御局部発振回路、 117,121…中間周波信号増幅回路、 105,110…利得制御回路、 126…音声放送復調回路、 128…選局回路。 104,109 ... RF amplification circuit, 118, 122, 310 ... Band pass filter, 116, 120 ... Frequency conversion circuit, 113, 114, 119, 308 ... Voltage control local oscillation circuit, 117, 121 ... Intermediate frequency signal amplification circuit, 105, 110 ... Gain control circuit, 126 ... Audio broadcasting demodulation circuit, 128 ... Selection Central circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 竜之 神奈川県横浜市戸塚区吉田町292番地株式 会社日立画像情報システム内 (72)発明者 長嶋 敏夫 神奈川県横浜市戸塚区吉田町292番地株式 会社日立製作所映像メディア研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuyuki Hayashi, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Company Hitachi Image Information Systems (72) Toshio Nagashima 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi Media Media Research Laboratories
Claims (7)
の周波数に変換した衛星第１中間周波信号と、衛星放送
信号をＣＡＴＶ放送局等で受信し、ＣＡＴＶ周波帯に周
波数変換して伝送される衛星放送信号と同一の信号変調
方式のＣＡＴＶ信号を受信し、少なくとも一方の信号を
第２の中間周波信号に周波数変換して出力するチューナ
装置において、 少なくとも衛星第１中間周波信号とＣＡＴＶ周波数帯の
信号の一方を前記ＣＡＴＶ周波数帯よりも高い第３の中
間周波信号周波数帯に周波数変換する第１の周波数変換
器と、この第３の中間周波信号が入力され、前記第２の
中間周波信号に変換する第２の周波数変換器を備えてた
ことを特徴とするチューナ装置。1. A satellite first intermediate frequency signal obtained by directly receiving a satellite broadcast signal and converting it to a frequency of about 1 GHz band, and a satellite broadcast signal are received by a CATV broadcasting station, etc., frequency-converted to the CATV frequency band and transmitted. A tuner device for receiving a CATV signal of the same signal modulation method as a satellite broadcast signal, converting at least one of the signals into a second intermediate frequency signal and outputting the second intermediate frequency signal, at least the first intermediate frequency signal of the satellite and the CATV frequency A first frequency converter for frequency-converting one of the band signals into a third intermediate frequency signal frequency band higher than the CATV frequency band, and the third intermediate frequency signal being input to the second intermediate frequency signal. A tuner device comprising a second frequency converter for converting into a signal.
衛星第１中間周波信号入力端子とＣＡＴＶ信号入力端子
を備え、これら入力端子から入力された衛星第１中間周
波信号とＣＡＴＶ信号を選択切り替えて第１の周波数変
換器に入力する第１の切り換え回路を設けたことを特徴
とするチューナ装置。2. The tuner device according to claim 1, at least:
A first switching circuit having a satellite first intermediate frequency signal input terminal and a CATV signal input terminal, and selectively switching between the satellite first intermediate frequency signal and CATV signal input from these input terminals and inputting them to a first frequency converter. A tuner device characterized by being provided with.
１中間周波信号が入力される入力端子と第１の周波数変
換器間には少なくとも希望信号を選択する帯域フィルタ
を設けたことを特徴とするチューナ装置。3. The tuner device according to claim 2, wherein a bandpass filter for selecting at least a desired signal is provided between the input terminal to which the satellite first intermediate frequency signal is input and the first frequency converter. Tuner device to play.
少なくとも第１および第２第の可変周波数発振器を具備
し、衛星放送を受信する場合には第１の可変周波数発振
器の発振信号と、ＣＡＴＶ信号を受信する場合には第２
の可変周波数発振器の発振信号を選択切り替えて第１の
周波数変換器に出力する第２の切り換え回路を設けたこ
とを特徴とするチューナ装置。4. The tuner device according to claim 1, 2 or 3,
At least first and second variable frequency oscillators are provided, and an oscillation signal of the first variable frequency oscillator for receiving satellite broadcasting and a second oscillation signal for receiving a CATV signal are provided.
2. A tuner device comprising a second switching circuit for selectively switching the oscillation signal of the variable frequency oscillator and outputting it to the first frequency converter.
置において、前記第３の中間周波信号の中心周波数は、
少なくとも４０２.７８、４７９.５、６１１ＭＨｚのい
づれかであり、第２の中間周波信号周波数は１１８ＭＨ
ｚあるいは１４０ＭＨｚであることを特徴とするチュー
ナ装置。5. The tuner device according to claim 1, 2 or 3 or 4, wherein the center frequency of the third intermediate frequency signal is
At least 402.78, 479.5 or 611 MHz, and the second intermediate frequency signal frequency is 118 MH
A tuner device characterized by being z or 140 MHz.
中間周波信号出力端子の他に、第１の周波数変換器の出
力信号を出力する出力端子を設けたことを特徴とするチ
ューナ装置。6. The tuner device according to claim 5, further comprising an output terminal for outputting an output signal of the first frequency converter, in addition to the second intermediate frequency signal output terminal.
とも第３の中間周波信号を増幅する第１の中間周波信号
増幅回路および第２の中間周波信号を増幅する第２の中
間周波信号増幅回路を具備し、少なくとも第１の周波数
変換器、第１、第２の切り替え回路、第１の中間周波信
号増幅回路および第１、第２の可変周波数発振器を含む
ＩＣを有することを特徴とするチューナ装置。7. The tuner device according to claim 4 or 6, wherein at least a first intermediate frequency signal amplifier circuit for amplifying the third intermediate frequency signal and a second intermediate frequency signal amplifier for amplifying the second intermediate frequency signal. A circuit, and an IC including at least a first frequency converter, first and second switching circuits, a first intermediate frequency signal amplification circuit, and first and second variable frequency oscillators. Tuner device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276978A JPH06133317A (en) | 1992-10-15 | 1992-10-15 | Tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276978A JPH06133317A (en) | 1992-10-15 | 1992-10-15 | Tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06133317A true JPH06133317A (en) | 1994-05-13 |
Family
ID=17577066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4276978A Pending JPH06133317A (en) | 1992-10-15 | 1992-10-15 | Tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06133317A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000046466A (en) * | 1998-12-31 | 2000-07-25 | 윤종용 | Multichannel tuning device |
| KR20030094596A (en) * | 2002-06-07 | 2003-12-18 | 엘지이노텍 주식회사 | Combination tuner for earth and satellite broadcasting |
| US20150256787A1 (en) * | 2014-03-04 | 2015-09-10 | Sony Corporation | Receiver apparatus, tuner, and circuit |
-
1992
- 1992-10-15 JP JP4276978A patent/JPH06133317A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000046466A (en) * | 1998-12-31 | 2000-07-25 | 윤종용 | Multichannel tuning device |
| KR20030094596A (en) * | 2002-06-07 | 2003-12-18 | 엘지이노텍 주식회사 | Combination tuner for earth and satellite broadcasting |
| US20150256787A1 (en) * | 2014-03-04 | 2015-09-10 | Sony Corporation | Receiver apparatus, tuner, and circuit |
| US9432610B2 (en) * | 2014-03-04 | 2016-08-30 | Sony Corporation | Receiver apparatus, tuner, and circuit |
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