JPS6248192A - Tuner circuit for satellite broadcasting television receiver - Google Patents
Tuner circuit for satellite broadcasting television receiverInfo
- Publication number
- JPS6248192A JPS6248192A JP18764585A JP18764585A JPS6248192A JP S6248192 A JPS6248192 A JP S6248192A JP 18764585 A JP18764585 A JP 18764585A JP 18764585 A JP18764585 A JP 18764585A JP S6248192 A JPS6248192 A JP S6248192A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- intermediate frequency
- pass filter
- tuner
- band pass
- 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
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は＃７星放送テレビ受信機において、必要とされ
る同調回路をすべて内蔵したチューナ回路に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tuner circuit that incorporates all the necessary tuning circuits in a #7 star broadcast television receiver.
「従来の技術」
一般に、米国の衛星放送テレビ受信機は、第２図に示す
ように、アンテナ（１）で衛星からの３．７〜４．２Ｇ
ＩＩｚの信号を受信すると、この信号をローノイズアン
プ（２）で増幅し、ダウンコンバータ（３）で４３０〜
９３０ＭＨｚの中間周波数信号となし、さらに、チュー
ナ回路（４）で、中心周波数が７０ Ｍ Ｈｚの信号を
得るものである。"Prior Art" Generally, as shown in Fig. 2, satellite television receivers in the United States receive 3.7 to 4.2G signals from the satellite at the antenna (1).
When the IIz signal is received, the low noise amplifier (2) amplifies this signal, and the down converter (3) converts it to 430~
An intermediate frequency signal of 930 MHz is used, and a tuner circuit (4) obtains a signal with a center frequency of 70 MHz.
しかるに、従来のチューナ回路には、第３図に示すよう
に、１段のバンドパスフィルタ（５）を具備し、チュー
ナ回路（４）の後段に、さらにバンドパスフィルタ（６
）を挿入していた。すなわち、第３図においてチューナ
回路（４）は、７０Ｍｌ１ｚの入力端子（７）、高周波
増幅回路（８）、フィルタ回路（９）、局部発振回路（
１０）、混合回路（１１）、中間周波増幅回路（１２）
、バンドパスフィルタ回路（５）、増幅回路（１３）、
ローパスフィルタ回路（１４）で構成されていた。However, as shown in FIG. 3, the conventional tuner circuit is equipped with a one-stage band-pass filter (5), and a further band-pass filter (6) is provided after the tuner circuit (4).
) was inserted. That is, in FIG. 3, the tuner circuit (4) includes a 70Ml1z input terminal (7), a high frequency amplifier circuit (8), a filter circuit (9), and a local oscillation circuit (
10), mixing circuit (11), intermediate frequency amplification circuit (12)
, bandpass filter circuit (5), amplifier circuit (13),
It consisted of a low-pass filter circuit (14).
ところが、衛星放送テレビは中間周波数の中心周波数が
７０Ｍ１ｌｚで、両側に±２０ Ｍ Ｈｚ程度と、一般
のテレビ放送に比し帯域中が極めて広いので、隣接チャ
ンネルとの重複防止のためにも、フィルタ回路のフラッ
ト部分を広くし、かつスカート部分をシャープにする必
要がある。そのため、従来は第３図に示すように、トラ
ンジスタ（１５） （１６）を主体とする増幅回路の間
に、コイル（１７） （１８）、コンデンサ（１９）
（２０）、（２１） （２２）、抵抗（２３） （２４
）からなる複同調のバンドパスフィルタ回路（６）を必
要としていた。However, the center frequency of satellite broadcast TV is 70M1lz, and the band on both sides is approximately ±20MHz, which is extremely wide compared to general TV broadcasting, so filters are required to prevent overlap with adjacent channels. It is necessary to make the flat part of the circuit wider and the skirt part sharper. Therefore, conventionally, as shown in Figure 3, coils (17) (18) and capacitors (19) were connected between amplifier circuits mainly consisting of transistors (15) and (16).
(20), (21) (22), resistance (23) (24
), a double-tuned bandpass filter circuit (6) was required.
「発明が解決しようとする問題点」
従来のように、チューナ回路の外部にフィルタ回路を形
成すると、このフィルタ回路のコイルによって妨害波が
混入し、周波数特性が変化し、しかもフィルタ回路が離
れた個所に挿入されていると、調整が困難であるなどの
問題があった。``Problems to be solved by the invention'' When a filter circuit is formed outside the tuner circuit as in the past, interference waves are mixed in by the coil of this filter circuit, changing the frequency characteristics, and the filter circuit is separated. If it is inserted in a certain place, there are problems such as difficulty in adjusting it.
「問題点を解決するための手段」
本発明は上述のような問題点を解決するためになされた
もので、入力端子から入力した衛星放送テレビ信号を増
幅し、その信号を中間周波信号に周波数変換し、さらに
フィルタ回路にて所定の帯域幅を得るようにしたチュー
ナ回路において、前記フィルタ回路は第１の中間周波用
バンドパスフィルタ回路の他にさらに第２の中間周波用
バンドパスフィルタ回路を具備し、これらのバンドパス
フィルタ回路を板金のチューナ用ケース内にチューナ回
路と一体に収納してなるものである。"Means for Solving the Problems" The present invention was made to solve the above-mentioned problems, and it amplifies the satellite broadcast television signal input from the input terminal, converts the signal into an intermediate frequency signal, and converts the signal into an intermediate frequency signal. In the tuner circuit, the filter circuit further includes a second intermediate frequency band pass filter circuit in addition to the first intermediate frequency band pass filter circuit. These bandpass filter circuits are housed integrally with the tuner circuit in a sheet metal tuner case.
「作用」
衛星放送テレビの中間周波信号の中心周波数は７０ＭＨ
ｚで、それを中心に両側に２０Ｍｔ（ｚ程度ずつの帯域
巾を必要とするが、第１と第２のバンドパスフィルタを
有するので、充分な帯域巾が得られまた、周波数特性の
スカート部分がシャープになるので、隣接チャンネルの
周波数と重複するのを防止できる。"Operation" The center frequency of the intermediate frequency signal of satellite broadcast television is 70MH
z, a bandwidth of about 20 Mt (approximately z) is required on both sides of the center, but since it has the first and second bandpass filters, a sufficient bandwidth can be obtained. Since the signal becomes sharp, it is possible to prevent the frequency from overlapping with the frequency of an adjacent channel.
「実施例」 以下、本発明の一実施例を第１図に基づき説明する。"Example" An embodiment of the present invention will be described below with reference to FIG.
４３０〜９３０ＭＨｚの信号入力端子（７）、高周波増
幅回路（８）、フィルタ回路（９）、局部発振回路（１
ｏ）、混合回路（１１）、中間周波増幅回路（１２）ま
での構成は第３図と変るところはない。430-930MHz signal input terminal (7), high frequency amplifier circuit (8), filter circuit (9), local oscillation circuit (1)
o), the configuration up to the mixing circuit (11) and the intermediate frequency amplification circuit (12) is the same as in FIG.
本発明の特徴とするところは、中間周波増幅回路（１２
）のつぎに、第１の中間周波用バンドパスフィルタ回路
（５ａ）、増幅回路（１３）を介して第２の中間周波用
バンドパスフィルタ回路（５ｂ）を挿入し、さらにエミ
ッタフォロアの増幅回路（２５）を介して出力端子（２
６）に結合したものである。さらに、チューナ回路（４
）は、全ての部品を板金のケースに収納してなるもので
ある。The feature of the present invention is that the intermediate frequency amplification circuit (12
), a second intermediate frequency band pass filter circuit (5b) is inserted via the first intermediate frequency band pass filter circuit (5a) and an amplifier circuit (13), and further an emitter follower amplifier circuit is inserted. (25) via the output terminal (2
6). Furthermore, the tuner circuit (4
), all parts are housed in a sheet metal case.
このような構成とすることによって、第１、第２のバン
ドパスフィルタ回路（５ａ） （５ｂ）によって。With such a configuration, the first and second bandpass filter circuits (5a) and (5b).
より広くてスカート部分のシャープな周波数特性が得ら
れる。A wider and sharper frequency response in the skirt area can be obtained.
なお、前記第１、第２のバンドパスフィルタ回路（５ａ
） （５ｂ）はコイルとコンデンサによるＬＣ共振回路
のみならず５ＡＷ（弾性表面波）フィルタ回路であって
もよい。Note that the first and second band pass filter circuits (5a
) (5b) may be not only an LC resonance circuit including a coil and a capacitor but also a 5AW (surface acoustic wave) filter circuit.
「発明の効果」
本発明は上述のように構成したので、っぎのような効果
を有する。"Effects of the Invention" Since the present invention is configured as described above, it has the following effects.
（１）第１、第２のバンドパスフィルタ回路をチューナ
回路の内部に一体に組込んだので調整が１個所で済む。(1) Since the first and second band-pass filter circuits are integrated into the tuner circuit, adjustment can be made in one place.
（２）フィルタ回路のコイルが板金のケース内に収納さ
れたのでノイズ等の混入がなく、特性が変化しない。(2) Since the coil of the filter circuit is housed in a sheet metal case, there is no noise or other contamination, and the characteristics do not change.
（３）周波数特性のフラット部分を広くでき、かつ隣接
と重複するスカート部分をシャープにできるので、周波
数帯域中の広い衛星放送テレビに最適である。(3) The flat part of the frequency characteristic can be widened, and the skirt part that overlaps with the adjacent part can be made sharp, so it is ideal for satellite broadcast television with a wide frequency band.
（４）周波数特性を作るフィルタ回路をチューナ回路の
後段に挿入する必要がない。(4) There is no need to insert a filter circuit that creates frequency characteristics after the tuner circuit.
第１図は本発明によるチューナ回路の一実施例を示すブ
ロック図、第２図は米国の衛星放送テレビのアンテナか
らチューナ回路までの一般的なブロック図、第３図は従
来のチューナ回路のブロック図である。
（４）・・・チューナ回路、（５ａ）・・・第１のバン
ドパスフィルタ回路、（５ｂ）・・・第２のバンドパス
フィルタ回路。
（７）・・・入力端子、（８）・・・高周波増幅回路、
（１ｏ）・・・局部発振回路、（１１）・・・混合回路
、（１２）・・・中間周波増幅回路、（１３）・・・増
幅回路、（２５）・・・エミッタフォロア増幅回路。Fig. 1 is a block diagram showing an embodiment of a tuner circuit according to the present invention, Fig. 2 is a general block diagram from an antenna of an American satellite TV to a tuner circuit, and Fig. 3 is a block diagram of a conventional tuner circuit. It is a diagram. (4)...Tuner circuit, (5a)...First band pass filter circuit, (5b)...Second band pass filter circuit. (7)...Input terminal, (8)...High frequency amplifier circuit,
(1o)...Local oscillation circuit, (11)...Mixing circuit, (12)...Intermediate frequency amplification circuit, (13)...Amplification circuit, (25)...Emitter follower amplification circuit.
Claims (1)
し、その信号を中間周波信号に周波数変換し、さらにフ
ィルタ回路にて所定の帯域幅を得るようにしたチューナ
回路において、前記フィルタ回路は第１の中間周波用バ
ンドパスフィルタ回路の他にさらに第２の中間周波用バ
ンドパスフィルタ回路を具備し、これらのバンドパスフ
ィルタ回路を板金のチューナ用ケース内にチューナ回路
と一体に収納してなることを特徴とする衛星放送テレビ
受信機のチューナ回路。(1) In a tuner circuit that amplifies a satellite broadcast television signal input from an input terminal, converts the frequency of the signal into an intermediate frequency signal, and further obtains a predetermined bandwidth using a filter circuit, the filter circuit is In addition to the first intermediate frequency band pass filter circuit, a second intermediate frequency band pass filter circuit is further provided, and these band pass filter circuits are housed integrally with the tuner circuit in a sheet metal tuner case. A tuner circuit for a satellite television receiver, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18764585A JPS6248192A (en) | 1985-08-27 | 1985-08-27 | Tuner circuit for satellite broadcasting television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18764585A JPS6248192A (en) | 1985-08-27 | 1985-08-27 | Tuner circuit for satellite broadcasting television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6248192A true JPS6248192A (en) | 1987-03-02 |
Family
ID=16209737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18764585A Pending JPS6248192A (en) | 1985-08-27 | 1985-08-27 | Tuner circuit for satellite broadcasting television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6248192A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5888937A (en) * | 1981-11-16 | 1983-05-27 | ザ・ベンデイツクス・コ−ポレ−シヨン | Circuit for selecting amplitude modulation radio receiver |
| JPS58153428A (en) * | 1982-03-08 | 1983-09-12 | Matsushita Electric Ind Co Ltd | Tuner for receiving wide band |
| JPS58161537A (en) * | 1982-03-19 | 1983-09-26 | Matsushita Electric Ind Co Ltd | Wide band receiving tuner |
-
1985
- 1985-08-27 JP JP18764585A patent/JPS6248192A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5888937A (en) * | 1981-11-16 | 1983-05-27 | ザ・ベンデイツクス・コ−ポレ−シヨン | Circuit for selecting amplitude modulation radio receiver |
| JPS58153428A (en) * | 1982-03-08 | 1983-09-12 | Matsushita Electric Ind Co Ltd | Tuner for receiving wide band |
| JPS58161537A (en) * | 1982-03-19 | 1983-09-26 | Matsushita Electric Ind Co Ltd | Wide band receiving tuner |
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