JPS59127350U - satellite receiver - Google Patents
satellite receiverInfo
- Publication number
- JPS59127350U JPS59127350U JP2128783U JP2128783U JPS59127350U JP S59127350 U JPS59127350 U JP S59127350U JP 2128783 U JP2128783 U JP 2128783U JP 2128783 U JP2128783 U JP 2128783U JP S59127350 U JPS59127350 U JP S59127350U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- low
- local oscillator
- demodulator
- 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
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の衛星テレビジョン放送受信機のシステム
構成図、第２図は本考案に係る衛星テレビジョン放送受
信機の一実施例構成、第３図は周波数偏移の方向を説明
している説明図、第４図は変調ビデオ信号の一例、第５
図は変調ビデオ信号のレベルと周波数との関係を説明し
ている衛星信号の一例、第６図は本考案に係る衛星放送
受信機の極性の反転・非反転を説明している説明図、第
７図は発振周波数が切換えられる局部発振器の一実施例
構成を示している。
図中、１はパラボラアンテナ、２は低雑音コンバータ、
３はミキサ、４は局部発振器、５は周波数変換器、６は
ミキサ、７は局部発振器、８は復調器、９はディエンフ
ァシス回路、１０はローパスフィルタ、１１はクランプ
回路、１２は出力増幅器、１８は基準信号発生器、１９
は分周器、２０は位相比較器、２１はループフィルタ、
２２は電圧制御発振器、２３は分周器、２４は可変分周
器、２５はてい倍器を表わしている。Fig. 1 is a system configuration diagram of a conventional satellite television broadcasting receiver, Fig. 2 is an example configuration of a satellite television broadcasting receiver according to the present invention, and Fig. 3 explains the direction of frequency shift. Figure 4 is an example of a modulated video signal;
The figure shows an example of a satellite signal explaining the relationship between the level and frequency of a modulated video signal. FIG. 7 shows the configuration of an embodiment of a local oscillator whose oscillation frequency is switched. In the figure, 1 is a parabolic antenna, 2 is a low noise converter,
3 is a mixer, 4 is a local oscillator, 5 is a frequency converter, 6 is a mixer, 7 is a local oscillator, 8 is a demodulator, 9 is a de-emphasis circuit, 10 is a low-pass filter, 11 is a clamp circuit, 12 is an output amplifier, 18 is a reference signal generator, 19
is a frequency divider, 20 is a phase comparator, 21 is a loop filter,
22 is a voltage controlled oscillator, 23 is a frequency divider, 24 is a variable frequency divider, and 25 is a multiplier.
Claims (1)
ＳＨＦ帯の電波を受信し、屋外ユニットに設けられた低
雑音コンバータでＵＨＦ書の周波数に変換した後、屋内
ユニットの周波数変換器に導入して周波数変換を行ない
、その中間周波信号から復調器で復調してビデオ信号を
得るようにした衛星放送受信機において、屋内ユニット
に設けられた上記周波数変換器の局部発振器に、上記低
雑音コンバータから得られたＵＨＦ帯の信号周波数が正
方向偏移のときには上記局部発振器の発振周波数を高い
周波数か低い周波数かのいずれか一方に切換え、低雑音
コンバータから得られたＵＨＦ帯の信号周波数が負方向
偏移のときには上記局部発振器の発振周波数を高い周波
数か低い周波数のいずれか他方に切換える切換手段を設
け、上記復調器に対し予め定めた方向偏移のＦＭ変調信
号が入力するようにしたことを特徴とする衛星放送受信
機。Receives SHF band radio waves from a broadcasting satellite that are FM-modulated with video and audio signals, converts them to UHF frequencies with a low-noise converter installed in the outdoor unit, and then introduces them into the frequency converter of the indoor unit. In a satellite broadcasting receiver that performs frequency conversion using a demodulator and demodulates the intermediate frequency signal using a demodulator to obtain a video signal, a signal from the low noise converter is connected to a local oscillator of the frequency converter installed in the indoor unit. When the obtained UHF band signal frequency shifts in the positive direction, the oscillation frequency of the local oscillator is switched to either a high frequency or a low frequency, and the UHF band signal frequency obtained from the low noise converter shifts in the negative direction. A switching means is provided to switch the oscillation frequency of the local oscillator to either a high frequency or a low frequency when the deviation occurs, so that an FM modulation signal with a predetermined direction deviation is input to the demodulator. Characteristic satellite broadcast receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128783U JPS59127350U (en) | 1983-02-16 | 1983-02-16 | satellite receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128783U JPS59127350U (en) | 1983-02-16 | 1983-02-16 | satellite receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59127350U true JPS59127350U (en) | 1984-08-27 |
Family
ID=30152414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2128783U Pending JPS59127350U (en) | 1983-02-16 | 1983-02-16 | satellite receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59127350U (en) |
-
1983
- 1983-02-16 JP JP2128783U patent/JPS59127350U/en active Pending
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