JPS61189733A - Receiving device - Google Patents
Receiving deviceInfo
- Publication number
- JPS61189733A JPS61189733A JP2952685A JP2952685A JPS61189733A JP S61189733 A JPS61189733 A JP S61189733A JP 2952685 A JP2952685 A JP 2952685A JP 2952685 A JP2952685 A JP 2952685A JP S61189733 A JPS61189733 A JP S61189733A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- phase
- circuit
- input
- 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.)
- Granted
Links
Landscapes
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は衛星放送、０ＡＴＶをはじめとするテレビ受像
機等に用いることができる受信装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a receiving device that can be used for satellite broadcasting, television receivers including 0ATV, and the like.
従来の技術
近年、テレビ放送は既存の地上放送（ＡＭ信号）に加え
て衛星放送も開始されているが、衛星放送信号は屋内受
信機入力時でも、１Ｇ±帯と周波数が高く、変調方式も
ＦＭ変調であり、既存の放送とは異なっている。Conventional technology In recent years, satellite broadcasting has started in addition to the existing terrestrial broadcasting (AM signal), but satellite broadcasting signals have a high frequency of 1G ± band even when input to an indoor receiver, and the modulation method is also high. This is FM modulation, which is different from existing broadcasting.
その信号を受信するためには専用受信ユニットをテレビ
受像機に接続しなければならず、２つの復調器を別々に
使用して受信していた。従って統合一体化された受信装
置が望まれている。In order to receive the signal, a dedicated receiving unit must be connected to the television receiver, and two demodulators were used separately for reception. Therefore, an integrated, integrated receiver is desired.
以下、図面を参照しながら、上述した従来の受信装置に
ついて説明する。第２図は、従来の受信装置の回路ブロ
ック図であり、衛星放送の信号はアンテナ直下の屋外ユ
ニットでＩ ＧＨｚ帯の信号に変換され入力端子ａに入
る。入力端子ａに入った信号は、屋内ユニット１６の入
力端子ｐに入り高周波増幅器１５１で増幅された後、周
波数混合器１６２で周波数変換されて、バンドパスフィ
ルタ１５４に入る。衛星放送チャネルの選局は局部発振
器１５３の発振周波数を変えて行なう。バンドパスフィ
ルタ１６４を通過した信号はＦＭ復調器１５６に入る。Hereinafter, the above-mentioned conventional receiving device will be explained with reference to the drawings. FIG. 2 is a circuit block diagram of a conventional receiving device, in which a satellite broadcast signal is converted into an I GHz band signal by an outdoor unit directly below the antenna and input to input terminal a. A signal that has entered input terminal a enters input terminal p of indoor unit 16 and is amplified by high-frequency amplifier 151 , frequency-converted by frequency mixer 162 , and then enters band-pass filter 154 . Selection of a satellite broadcasting channel is performed by changing the oscillation frequency of the local oscillator 153. The signal passing through bandpass filter 164 enters FM demodulator 156 .
出力端子ｑからは復調出力信号が得られ信号切換回路１
０を通り出力端子ｎから出力され映像信号処理、音声信
号処理して衛星放送を受信する。一方既存の地上放送信
号は入力端子すに入力され、入力フィルタ部１６で希望
信号帯域を選択され、高周波増幅器２で増幅された後、
周波数混合器１３で中間周波数に変換され、ＡＭ復調器
１４に入力されて、復調出力信号は端子ｍに入り信号切
換回路１０を介し、出力端子ｎより出力され、映像信号
処理、音声信号処理して地上放送を受信する。局部発振
器１２の発振周波数を変えることで選局ができる。従来
のテレビ受像機は地上放送受信用としてＡＭ復調器を有
するため、衛星放送受信の時には専用受信ユニツ）（Ｆ
Ｍ復調器）が必要であった。専用受信ユニットとして外
部アダプター形（例えば、「ナシヨナル・テクニカル・
レボ−） Ｊ 、 ＶｏＬ、 ３０４１ Ｆ ＥＢ 。A demodulated output signal is obtained from the output terminal q, and the signal switching circuit 1
0 and is output from output terminal n, and undergoes video signal processing and audio signal processing to receive satellite broadcasting. On the other hand, the existing terrestrial broadcast signal is input to the input terminal, the desired signal band is selected by the input filter section 16, and after being amplified by the high frequency amplifier 2,
The demodulated output signal is converted to an intermediate frequency by the frequency mixer 13 and input to the AM demodulator 14, and then enters the terminal m, passes through the signal switching circuit 10, and is output from the output terminal n, where it is processed for video signal processing and audio signal processing. to receive terrestrial broadcasts. Tuning can be performed by changing the oscillation frequency of the local oscillator 12. Conventional television receivers have an AM demodulator for receiving terrestrial broadcasting, so when receiving satellite broadcasting, a dedicated receiving unit (F
M demodulator) was required. External adapter type (for example, "National Technical
Rev.) J, VoL, 3041 FEB.
１９８４ 、 ＰＰ４−１２ ）があり、また、テレビ
受像機内に内蔵された専用ユニット（例えば、「テレビ
技術」、８４年９月号ＰＰ３ｏ〜３５）があった。1984, PP4-12), and there were also dedicated units built into television receivers (for example, "Television Technology", September 1984 issue PP3o-35).
発明が解決しようとする問題点
しかしながら上記のような構成では、衛星放送受信用と
地上放送受信用の２系統の異なった受信系を用いている
ので回路構成上の冗長が大であるという問題点を有して
いた。Problems to be Solved by the Invention However, the above configuration uses two different receiving systems, one for satellite broadcast reception and one for terrestrial broadcast reception, resulting in a large amount of redundancy in the circuit configuration. It had
本発明は上記問題点に鑑みてなされたもので、回路構成
上の冗長度を小さくするため、ＦＭｉ調器を構成する位
相同期回路をＡＭ復調時には前記位相同期回路の入力信
号と同一周波数の発振器として動作し、乗算器に入力し
てＡＭ復調器を構成することでＦＭ、ＡＭ信号を復調で
きる受信装置を提供することを目的としている。The present invention has been made in view of the above problems, and in order to reduce the redundancy in the circuit configuration, the phase-locked circuit constituting the FMi modulator is used as an oscillator having the same frequency as the input signal of the phase-locked circuit during AM demodulation. The object of the present invention is to provide a receiving device that can demodulate FM and AM signals by inputting the signals to a multiplier and configuring an AM demodulator.
問題点を解決するだめの手段
上記問題点を解決するために本発明の受信装置は、位相
同期回路を衛星放送信号受信時にはＦＭ復調器として使
用し、地上放送信号受信時には地上放送信号を衛星放送
信号入力周波数（１Ｇ１帯）に周波数変換した信号を前
記位相同期回路に入力し、前記周波数変換した信号と同
じ周波数の発振出力を得た後、移相器を介して乗算器に
入力する。Means for Solving the Problems In order to solve the above problems, the receiving device of the present invention uses a phase synchronization circuit as an FM demodulator when receiving a satellite broadcast signal, and when receiving a terrestrial broadcast signal, converts the terrestrial broadcast signal into a satellite broadcast signal. A signal frequency-converted to the signal input frequency (1G1 band) is input to the phase synchronization circuit, an oscillation output having the same frequency as the frequency-converted signal is obtained, and then input to the multiplier via a phase shifter.
一方、前記地上放送信号も前記乗算器に入力し、前記移
相器を介して入力した発振出力との積を得てＡＭ復調す
るという構成を備えたものである。On the other hand, the terrestrial broadcasting signal is also input to the multiplier, and the product is multiplied by the oscillation output input via the phase shifter for AM demodulation.
作 用
本発明は゛上記した構成によって、同一の位相同期回路
を用い衛星放送信号（ＦＭ信号）と地上放送信号（ＡＭ
信号）の受信復調が可能となる。Effect of the present invention: With the above-described configuration, the same phase synchronization circuit is used to transmit a satellite broadcast signal (FM signal) and a terrestrial broadcast signal (AM signal).
signal) can be received and demodulated.
実施例
以下本発明の一実施例の受信装置について、図面を参照
しながら説明する。第１図は本発明の実施例における受
信装置のブロック図を示すものである。Embodiment Hereinafter, a receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a receiving device in an embodiment of the present invention.
第１図において、入力端子ａには衛星放送信号（１ＧＩ
％帯）が入力され、入力フィルタ部１１の入力端子Ｃに
入り、受信希望周波数帯のみを通した後、出力端子ｅか
ら高周波増幅器１で増幅された後、高周波信号切換回路
６の入力端子ｑに入り前記高周波信号切換回路６を通り
、位相同期回路７の入力端子ｌに供給される。衛星放送
信号はＦｌシ信号であるので、位相比較器７１．ループ
フィルタ７３．電圧制御発振器７２より構成された位相
同期回路７はＦＭ復調器として動作し出力端子により復
調信号を取９出す。入力端子ｌに入る衛星放送信号は広
帯域であるので電圧制御発振器７２の発振周波数をステ
ップに切換えて受信希望信号周波数に一致させ、ＦＭ復
調を行なう。発振周波数の切換は制御端子ｒに制御信号
を与えて切換える。この制御信号はあらかじめ設定され
たものである。出力端子により取り出された復調信号は
端子ｌに供給され信号切換回路１ｏを通り出力端子ｎよ
り出力され映像信号処理、音声信号処理される。In Figure 1, input terminal a has a satellite broadcasting signal (1GI
% band) is input, enters the input terminal C of the input filter section 11, passes only the desired reception frequency band, is amplified by the high frequency amplifier 1 from the output terminal e, and then is sent to the input terminal q of the high frequency signal switching circuit 6. The signal enters, passes through the high frequency signal switching circuit 6, and is supplied to the input terminal l of the phase synchronization circuit 7. Since the satellite broadcasting signal is a Fl signal, the phase comparator 71. Loop filter 73. The phase synchronization circuit 7 composed of a voltage controlled oscillator 72 operates as an FM demodulator and outputs a demodulated signal from an output terminal. Since the satellite broadcast signal input to the input terminal l has a wide band, the oscillation frequency of the voltage controlled oscillator 72 is switched in steps to match the frequency of the signal desired to be received, and FM demodulation is performed. The oscillation frequency is switched by applying a control signal to the control terminal r. This control signal is set in advance. The demodulated signal taken out by the output terminal is supplied to the terminal l, passes through the signal switching circuit 1o, is outputted from the output terminal n, and is subjected to video signal processing and audio signal processing.
一方、地上放送信号受信時は、入力端子すに地上放送信
号が入力され、入力フィルタ部１１の入力端子ｄに供給
され受信希望周波数のみを通過させ出力端子ｆより取り
出され高周波増幅器２で増幅された後、周波数混合器４
に入り、局部発振器３０発振出力と混合され周波数変換
される。変換後の中間周波数は前述の衛星放送信号と同
じ周波数帯である。変換後の信号の一部は高周波信号切
換回路６の入力端子りに入力して、前記高周波信号切換
回路６を通って位相同期回路７の入力端子ｉに供給され
る。位相比較器７１．ループフィルタ７３．電圧制御発
振器ア２より構成した位相同期回路７は、入力端子ｉに
供給された信号周波数と一致した発振周波数で電圧制御
発振器７２が発根し、出力端子ｉに発振出力が現われる
。この時、入力端子ｉに供給された信号と出力端子ｊに
現われる発振信号はπ／２の位相差がある。On the other hand, when receiving a terrestrial broadcast signal, the terrestrial broadcast signal is input to the input terminal 2, is supplied to the input terminal d of the input filter section 11, passes only the desired reception frequency, is taken out from the output terminal f, and is amplified by the high frequency amplifier 2. After that, frequency mixer 4
The signal is mixed with the oscillation output of the local oscillator 30 and frequency converted. The intermediate frequency after conversion is in the same frequency band as the above-mentioned satellite broadcast signal. A part of the converted signal is input to the input terminal of the high frequency signal switching circuit 6, and is supplied to the input terminal i of the phase synchronization circuit 7 through the high frequency signal switching circuit 6. Phase comparator 71. Loop filter 73. In the phase locked circuit 7 constituted by the voltage controlled oscillator A2, the voltage controlled oscillator 72 oscillates at an oscillation frequency that matches the signal frequency supplied to the input terminal i, and an oscillation output appears at the output terminal i. At this time, there is a phase difference of π/2 between the signal supplied to the input terminal i and the oscillation signal appearing at the output terminal j.
従って、この発振信号を移相器５によってπ／２移相し
て前記周波数混合器の出力信号と位相を一致させ、乗算
器８に入力し、積を取シ、乗算器８より復調信号を得る
ＡＭ復調器となる。その後ローパスフィルタ９を通り帯
域外の不要な成分を除いた後、信号切換回路１０に入る
よう入力端子ｍに供給されて出力端子ｎより取り出され
、映像信号処理、音声信号処理される。Therefore, this oscillation signal is phase-shifted by π/2 by a phase shifter 5 to match the phase with the output signal of the frequency mixer, inputted to a multiplier 8, the product is obtained, and the demodulated signal is output from the multiplier 8. It becomes an AM demodulator that obtains Thereafter, after passing through a low-pass filter 9 to remove unnecessary components outside the band, the signal is supplied to an input terminal m to enter a signal switching circuit 10, and taken out from an output terminal n, where it is subjected to video signal processing and audio signal processing.
以上のように本実施例によれば、同一の位相同期回路を
用いて衛星放送信号から地上放送信号を受信復調するこ
とが可能である。また、地上放送信号を周波数変換し、
中間周波数を受信信号周波数より高くするので、妨害性
能も有利となる。第１の実施例では、地上放送信号は無
線系と有線系がありＣＡＴＶ信号の受信も可能である。As described above, according to this embodiment, it is possible to receive and demodulate a terrestrial broadcast signal from a satellite broadcast signal using the same phase synchronization circuit. In addition, terrestrial broadcasting signals are frequency converted,
Since the intermediate frequency is made higher than the received signal frequency, the interference performance is also advantageous. In the first embodiment, terrestrial broadcasting signals include a wireless system and a wired system, and it is also possible to receive CATV signals.
発明の効果
以上のように本発明は、ＦＭ放送信号受信時には、ＦＭ
復調器として動作する位相同期回路に、ＡＭ放送信号受
信時にはＡＭ放送信号を位相同期回路の動作周波数帯に
周波数変換し、その信号の一部を前記位相同期回路に入
力して、電圧制御発振器から移相器を介してびられる発
振器出力と、前記周波数変換した信号の他の一部の積を
取り出す乗算器を具備したＡＭ復調器の構成を設けるこ
とにより、同一の復調器でＦＭ信号とＡＭ信号を復調で
きるため、回路の冗長が小さくなる。Effects of the Invention As described above, the present invention provides that when receiving an FM broadcast signal, the FM
When receiving an AM broadcast signal, the phase-locked circuit that operates as a demodulator converts the frequency of the AM broadcast signal to the operating frequency band of the phase-locked circuit, inputs a part of the signal to the phase-locked circuit, and outputs the signal from the voltage controlled oscillator. By providing an AM demodulator configuration that includes a multiplier that takes out the product of the oscillator output that is shifted via a phase shifter and another part of the frequency-converted signal, the same demodulator can perform both FM and AM signals. Since the signal can be demodulated, circuit redundancy is reduced.
また、ＡＭ放送信号のレベル変動に対しても、位相同期
回路の発振出力に移相器を設けているため、位相変化を
生じず、安定したＡＭ復調が可能である。また、回路は
位相同期回路を用いているのでＩＣ化も可能であシ゛ス
レッシタルドレベルヲ改善できる。さらに、ＦＭ復調、
ＡＭ復調が可能であるため、広帯域な受信と、種々の放
送２通信用受信に適した受信装置を提供することができ
る。In addition, since a phase shifter is provided at the oscillation output of the phase synchronization circuit, stable AM demodulation is possible without causing phase changes even when the level of the AM broadcast signal changes. Furthermore, since the circuit uses a phase locked circuit, it can be integrated into an IC, and the threshold level can be improved. Furthermore, FM demodulation,
Since AM demodulation is possible, a receiving device suitable for wideband reception and reception for various broadcast 2 communications can be provided.
第１図は、本発明の一実施例における受信装置のブロッ
ク図、第２図は従来の実施例における受信装置のブロッ
ク図である。
１．２，１５１・・・・・・高周波増幅器、３，１２゜
１６３・・・・・・局部発嘔器、４，１３，１６２・・
・・・・周波数混合器、６・・・・・・移相器、ｅ・・
・・・・高周波信号切換回路、７・・・・・・位相同期
回路、８・・・・・・乗算器、９゛・・・・・・ローパ
スフィルタ、１ｏ・・・・・・信号切換回路、１１．１
６・川・・入力フィルタ部、１４・・・・・・ＡＭ復調
器、１６・・・・・・屋内ユニット、７１・・・・・・
位相比較器、７３・・・・・・ループフィルタ、７２・
・・・・・電圧制御発振器。FIG. 1 is a block diagram of a receiving apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a receiving apparatus according to a conventional embodiment. 1.2,151...High frequency amplifier, 3,12゜163...Local vomiting device, 4,13,162...
... Frequency mixer, 6... Phase shifter, e...
...High frequency signal switching circuit, 7... Phase synchronization circuit, 8... Multiplier, 9゛... Low pass filter, 1o... Signal switching circuit, 11.1
6. Input filter section, 14... AM demodulator, 16... Indoor unit, 71...
Phase comparator, 73... Loop filter, 72.
...Voltage controlled oscillator.
Claims (1)
期回路と、ＡＭ放送信号受信時にはＡＭ放送信号を前記
位相同期回路の動作周波数帯に周波数変換する手段と、
その信号の一部を前記位相同期回路に入力して、電圧制
御発振器から取出した出力を移相する移相器と、前記移
相した出力と前記周波数変換した信号の他の一部の積を
取り出す乗算器を具備したＡＭ復調器とを備えたことを
特徴とする受信装置。a phase-locked circuit that operates as an FM demodulator when receiving an FM broadcast signal; and means for converting the frequency of the AM broadcast signal into an operating frequency band of the phase-locked circuit when receiving an AM broadcast signal;
A part of the signal is input to the phase locked circuit, and a phase shifter that shifts the phase of the output taken out from the voltage controlled oscillator, and a product of the phase-shifted output and another part of the frequency-converted signal are calculated. A receiving device comprising: an AM demodulator equipped with a multiplier for extracting an AM signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60029526A JPH0681066B2 (en) | 1985-02-18 | 1985-02-18 | Receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60029526A JPH0681066B2 (en) | 1985-02-18 | 1985-02-18 | Receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61189733A true JPS61189733A (en) | 1986-08-23 |
| JPH0681066B2 JPH0681066B2 (en) | 1994-10-12 |
Family
ID=12278549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60029526A Expired - Lifetime JPH0681066B2 (en) | 1985-02-18 | 1985-02-18 | Receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0681066B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63179625A (en) * | 1987-01-20 | 1988-07-23 | Matsushita Electric Ind Co Ltd | Receiver |
| KR100444227B1 (en) * | 2001-12-26 | 2004-08-11 | 삼성전기주식회사 | Rf modulator with two input |
-
1985
- 1985-02-18 JP JP60029526A patent/JPH0681066B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63179625A (en) * | 1987-01-20 | 1988-07-23 | Matsushita Electric Ind Co Ltd | Receiver |
| KR100444227B1 (en) * | 2001-12-26 | 2004-08-11 | 삼성전기주식회사 | Rf modulator with two input |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0681066B2 (en) | 1994-10-12 |
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