JPS5590112A - Television agc circuit - Google Patents
Television agc circuitInfo
- Publication number
- JPS5590112A JPS5590112A JP16435278A JP16435278A JPS5590112A JP S5590112 A JPS5590112 A JP S5590112A JP 16435278 A JP16435278 A JP 16435278A JP 16435278 A JP16435278 A JP 16435278A JP S5590112 A JPS5590112 A JP S5590112A
- Authority
- JP
- Japan
- Prior art keywords
- agc
- rfagc
- signal
- circuit
- line
- 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
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE: To position an RFAGC control start at the best point by providing a switching method of changing the RFAGC control voltage of a TV receiver between the low-band LB and high-band HB of a received channel.
CONSTITUTION: The output of detection circuit 4 is inputted to AGC signal output circuit 5, and an RFAGC signal outputted from circuit 5 is inputted to channel selection block 2 and VIF circuit 3. Channel selection block 2 consists of an electronic tuner and a detection signal of "0" in case of LB or of "1" in case of HB appears at line 9. This signal turns switching transistor TrT1 ON in HB mode to short resistance R2. An RFAGC control voltage developed at line 10 is adjusted by volume R1 to set the AGC control start point of the AGC signal to a fixed value. At the time of LB reception, the detection signal on line 9 is "0" and TrT1 is OFF to insert resistance R2 in series to volume R1, thereby increasing the AGC control voltage. As a result, the AGC control start point can be set to the best point in LB and HB both, so that the mixing of noise can be prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16435278A JPS5590112A (en) | 1978-12-27 | 1978-12-27 | Television agc circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16435278A JPS5590112A (en) | 1978-12-27 | 1978-12-27 | Television agc circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5590112A true JPS5590112A (en) | 1980-07-08 |
Family
ID=15791518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16435278A Pending JPS5590112A (en) | 1978-12-27 | 1978-12-27 | Television agc circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5590112A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62189806A (en) * | 1986-02-17 | 1987-08-19 | Sanyo Electric Co Ltd | Rf agc circuit |
-
1978
- 1978-12-27 JP JP16435278A patent/JPS5590112A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62189806A (en) * | 1986-02-17 | 1987-08-19 | Sanyo Electric Co Ltd | Rf agc circuit |
JPH0423441B2 (en) * | 1986-02-17 | 1992-04-22 | Sanyo Electric Co |
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