JPH02147941U - - Google Patents
Info
- Publication number
- JPH02147941U JPH02147941U JP5742689U JP5742689U JPH02147941U JP H02147941 U JPH02147941 U JP H02147941U JP 5742689 U JP5742689 U JP 5742689U JP 5742689 U JP5742689 U JP 5742689U JP H02147941 U JPH02147941 U JP H02147941U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- television broadcasting
- cutoff frequency
- bandwidth
- receiving
- 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
- 230000010355 oscillation Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Filters And Equalizers (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は、この考案の一実施例の構成を示すブ
ロツク図、第２図および第３図は同実施例の動作
を説明するための特性図、第４図は同実施例のハ
イパスフイルタの具体的回路例の構成を示す回路
図、第５図および第６図は従来のダブルスーパー
方式チユーナの構成を示すブロツク図、第７図は
第６図の従来例の動作を説明するための波形図で
ある。
３，８……混合器、４，９……局部発振器、１
４……選局操作部、１５……バンドパスフイルタ
、１６……ハイパスフイルタ。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention, FIGS. 2 and 3 are characteristic diagrams for explaining the operation of the embodiment, and FIG. 4 is a diagram of the high-pass filter of the embodiment. 5 and 6 are block diagrams showing the structure of a conventional double super type tuner, and FIG. 7 is a waveform for explaining the operation of the conventional example shown in FIG. 6. It is a diagram. 3, 8... Mixer, 4, 9... Local oscillator, 1
4...Tuning selection operation unit, 15...Band pass filter, 16...High pass filter.
Claims (1)
じて下限遮断周波数ｆＬ〜上限遮断周波数ｆＨの
帯域幅で第１中間周波信号をろ波するバンドパス
フイルタと、このバンドパスフイルタの後段に設
けられ、前記下限遮断周波数ｆＬよりも低い発振
周波数ｆＯＳＣの第２局部発振信号を発生する局
部発振器とを備えるテレビ放送受信用のダブルス
ーパー方式チユーナにおいて、 前記バンドパスフイルタに直列接続され、地上
テレビ放送受信時には遮断周波数が前記上側遮断
周波数ｆＨよりも地上テレビ放送の帯域幅分低い
周波数に設定され、衛星テレビ放送受信時には遮
断周波数が前記下側遮断周波数ｆＬと前記発振周
波数ｆＯＳＣとの間の周波数に設定されるハイパ
スフイルタを具備するとともに、前記第１中間周
波信号の中心周波数を地上テレビ放送受信時と衛
星テレビ放送受信時とに応じて変えることを特徴
とするダブルスーパー方式チユーナ。[Claims for Utility Model Registration] A bandpass filter that filters a first intermediate frequency signal with a bandwidth from a lower cutoff frequency fL to an upper cutoff frequency fH according to the bandwidth of one channel of satellite television broadcasting; A double super type tuner for receiving television broadcasting, comprising: a local oscillator provided after the pass filter and generating a second local oscillation signal having an oscillation frequency fOSC lower than the lower limit cutoff frequency fL; When receiving terrestrial television broadcasting, the cutoff frequency is set to a frequency lower than the upper cutoff frequency fH by the bandwidth of terrestrial television broadcasting, and when receiving satellite television broadcasting, the cutoff frequency is set to the lower cutoff frequency fL and the oscillation frequency fOSC. The double super system is characterized by comprising a high-pass filter set to a frequency between , and changing the center frequency of the first intermediate frequency signal depending on whether terrestrial television broadcasting is received or satellite television broadcasting is received. Chiyuna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5742689U JPH0713305Y2 (en) | 1989-05-18 | 1989-05-18 | Double super system tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5742689U JPH0713305Y2 (en) | 1989-05-18 | 1989-05-18 | Double super system tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02147941U true JPH02147941U (en) | 1990-12-17 |
| JPH0713305Y2 JPH0713305Y2 (en) | 1995-03-29 |
Family
ID=31582118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5742689U Expired - Lifetime JPH0713305Y2 (en) | 1989-05-18 | 1989-05-18 | Double super system tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0713305Y2 (en) |
-
1989
- 1989-05-18 JP JP5742689U patent/JPH0713305Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0713305Y2 (en) | 1995-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH02147941U (en) | ||
| JPH0439742U (en) | ||
| JP2515013Y2 (en) | Tuner circuit | |
| DE3741203C2 (en) | ||
| JPS6170472U (en) | ||
| JPH0365333U (en) | ||
| JPS61109242U (en) | ||
| JP2820713B2 (en) | Double conversion tuner | |
| JPH0339936U (en) | ||
| JPS62158943U (en) | ||
| JPH033884U (en) | ||
| JPH0443028U (en) | ||
| JPS6170427U (en) | ||
| JPH05276066A (en) | Wideband super-heterodyne receiver | |
| JPH0251290B2 (en) | ||
| JPH07264084A (en) | High frequency equipment | |
| JPS63147075U (en) | ||
| JPS6266437U (en) | ||
| JPS61109241U (en) | ||
| JPH0415370U (en) | ||
| JPS6338472U (en) | ||
| JPH0438152U (en) | ||
| JPS6219862U (en) | ||
| JPH01129927U (en) | ||
| JPS61126681U (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |