JPS57115034A - Television tuner circuit - Google Patents
Television tuner circuitInfo
- Publication number
- JPS57115034A JPS57115034A JP170481A JP170481A JPS57115034A JP S57115034 A JPS57115034 A JP S57115034A JP 170481 A JP170481 A JP 170481A JP 170481 A JP170481 A JP 170481A JP S57115034 A JPS57115034 A JP S57115034A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pass filter
- channel
- low
- frequency
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To reduce the limitation of distortion characteristic of a high frequency amplifier, by amplifying the high frequency of an input signal through a filter which can switch the input signal to VHF low, high channel and UHF channel, and making frequency conversion via a low pass filter. CONSTITUTION:Television signals at VHF low channel, a VHF high channel and a UHF band received at an antenna 1 are suitably selected at a switching filter 2, and after being amplified at a high frequency amplifying circuit 3 of AGC control, it is fed to a low-pass filter circuit 6. Since the low pass filter circuit 6 is set to block frequencies more than the UHF signal frequency, the interference in the UHF band produced when setting the gain of the circuit 3 to a high level can be avoided. The output of the low pass filter circuit 6 is applied to a mixing circuit 4 and frequency-converted into a VIF signal in 40MHz or similar with the local oscillating signal from a local oscillation circuit 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP170481A JPS57115034A (en) | 1981-01-08 | 1981-01-08 | Television tuner circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP170481A JPS57115034A (en) | 1981-01-08 | 1981-01-08 | Television tuner circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57115034A true JPS57115034A (en) | 1982-07-17 |
Family
ID=11508931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP170481A Pending JPS57115034A (en) | 1981-01-08 | 1981-01-08 | Television tuner circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57115034A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6486681A (en) * | 1987-09-28 | 1989-03-31 | Matsushita Electric Ind Co Ltd | Integrated electronic tuner |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5313812A (en) * | 1976-07-23 | 1978-02-07 | Alps Electric Co Ltd | Vhf uhf tuner |
-
1981
- 1981-01-08 JP JP170481A patent/JPS57115034A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5313812A (en) * | 1976-07-23 | 1978-02-07 | Alps Electric Co Ltd | Vhf uhf tuner |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6486681A (en) * | 1987-09-28 | 1989-03-31 | Matsushita Electric Ind Co Ltd | Integrated electronic tuner |
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