JPH02128489U - - Google Patents
Info
- Publication number
- JPH02128489U JPH02128489U JP1989040045U JP4004589U JPH02128489U JP H02128489 U JPH02128489 U JP H02128489U JP 1989040045 U JP1989040045 U JP 1989040045U JP 4004589 U JP4004589 U JP 4004589U JP H02128489 U JPH02128489 U JP H02128489U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- output
- circuit
- agc
- comparing
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Description
第１図は本考案に係るテレビジョン受信機の一
実施例を示す回路図、第２図は第１図のテレビジ
ョン受信機の受信レベル検出装置の入力電界とＡ
ＧＣ電圧との関係を示す説明図、第３図は第１図
の受信レベル検出装置の具体的回路例を示す回路
図、第４図は従来のテレビジョン受信機を示す回
路図、第５図は第４図の同期信号検出回路を示す
回路図である。
３……チユーナ、４……ＰＩＦ回路、８……同
期信号検出回路、９……ＡＧＣ電圧検出回路、１
０……アンド回路、１１……受信レベル検出装置
。
FIG. 1 is a circuit diagram showing an embodiment of the television receiver according to the present invention, and FIG. 2 shows the input electric field and A of the reception level detection device of the television receiver of FIG.
An explanatory diagram showing the relationship with the GC voltage, FIG. 3 is a circuit diagram showing a specific circuit example of the reception level detection device shown in FIG. 1, FIG. 4 is a circuit diagram showing a conventional television receiver, and FIG. 5 5 is a circuit diagram showing the synchronization signal detection circuit of FIG. 4. FIG. 3... Tuner, 4... PIF circuit, 8... Synchronous signal detection circuit, 9... AGC voltage detection circuit, 1
0...AND circuit, 11...Reception level detection device.
Claims (1)
周波増幅、映像検波を行う機能を有すると共に、
受信信号レベルに応じたＡＧＣ電圧を作成する機
能を有した回路手段と、 映像検波出力から水平同期信号を、第１の基準
値と比較し検出する水平同期信号検出回路と、 ＡＧＣ電圧を、第２の基準値と比較し検出する
ＡＧＣ電圧検出回路と、 前記ＡＧＣ検出回路の出力と前記水平同期信号
検出回路の出力のアンド出力により、テレビジョ
ン放送電波の受信レベルの良否を判定する手段と
を具備したことを特徴とするテレビジョン受信機
。[Scope of claim for utility model registration] Having the function of receiving television signals, performing frequency conversion, intermediate frequency amplification, and video detection,
circuit means having a function of creating an AGC voltage according to a received signal level; a horizontal synchronizing signal detection circuit that detects a horizontal synchronizing signal from a video detection output by comparing it with a first reference value; an AGC voltage detection circuit that detects the voltage by comparing it with a reference value of No. 2; and means for determining whether the reception level of the television broadcast wave is good or bad by AND outputting the output of the AGC detection circuit and the output of the horizontal synchronization signal detection circuit. A television receiver characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989040045U JP2581579Y2 (en) | 1989-03-30 | 1989-03-30 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989040045U JP2581579Y2 (en) | 1989-03-30 | 1989-03-30 | Television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02128489U true JPH02128489U (en) | 1990-10-23 |
| JP2581579Y2 JP2581579Y2 (en) | 1998-09-21 |
Family
ID=31549492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989040045U Expired - Lifetime JP2581579Y2 (en) | 1989-03-30 | 1989-03-30 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2581579Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55134583A (en) * | 1979-04-06 | 1980-10-20 | Hitachi Ltd | Automatic preset channel selector of television receiver |
| JPS58143678A (en) * | 1982-02-19 | 1983-08-26 | Sanyo Electric Co Ltd | Reception discriminating circuit |
| JPH028267U (en) * | 1988-06-30 | 1990-01-19 |
-
1989
- 1989-03-30 JP JP1989040045U patent/JP2581579Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55134583A (en) * | 1979-04-06 | 1980-10-20 | Hitachi Ltd | Automatic preset channel selector of television receiver |
| JPS58143678A (en) * | 1982-02-19 | 1983-08-26 | Sanyo Electric Co Ltd | Reception discriminating circuit |
| JPH028267U (en) * | 1988-06-30 | 1990-01-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2581579Y2 (en) | 1998-09-21 |
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