JPS5642411A - Audio intermediate frequency circuit - Google Patents
Audio intermediate frequency circuitInfo
- Publication number
- JPS5642411A JPS5642411A JP11851279A JP11851279A JPS5642411A JP S5642411 A JPS5642411 A JP S5642411A JP 11851279 A JP11851279 A JP 11851279A JP 11851279 A JP11851279 A JP 11851279A JP S5642411 A JPS5642411 A JP S5642411A
- Authority
- JP
- Japan
- Prior art keywords
- time
- amplifier
- electric field
- audio
- output
- 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
- 230000005684 electric field Effects 0.000 abstract 6
- 230000006866 deterioration Effects 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
Landscapes
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
- Picture Signal Circuits (AREA)
Abstract
PURPOSE:To lower a buzz level at the time of intermediate and strong electric field by preventing sound sensitivity deterioration at the time of a weak input electric field by making the output at the time of the intermediate and strong ectric field intensity constant by applying the output of a video IF amplifier with an AGC voltage and then by amplifying the output by an audio IF amplifier. CONSTITUTION:Under the control by applying video IF amplifier 3 with an AGC voltage from video IFAGC circuit 7, the output of amplifier 3 at the time of intermediate and strong electric field intensity is made constant and sound detection is performed by audio IF detector 9 through audio IF amplifier 8 to lower the buzz level. At the time of a weak electric field, the gain of audio IF amplifier 8 is lowered to prevent a noise component from being contained in a 4.5MHz component much, and consequently the deterioration of sound sensitivity at the time of a weak input electric field is prevented to lower the buzz level at the time of intermediate and strong electric fields.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11851279A JPS5642411A (en) | 1979-09-13 | 1979-09-13 | Audio intermediate frequency circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11851279A JPS5642411A (en) | 1979-09-13 | 1979-09-13 | Audio intermediate frequency circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5642411A true JPS5642411A (en) | 1981-04-20 |
| JPS6316951B2 JPS6316951B2 (en) | 1988-04-12 |
Family
ID=14738462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11851279A Granted JPS5642411A (en) | 1979-09-13 | 1979-09-13 | Audio intermediate frequency circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5642411A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59182681A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Micro Comput Eng Ltd | Television receiver |
| JPS618232A (en) * | 1984-06-20 | 1986-01-14 | Daido Kogyo Co Ltd | Manufacture of sprocket for bicycles and motor-cycles |
| JPS62236290A (en) * | 1986-03-27 | 1987-10-16 | アールシーエー トムソン ライセンシング コーポレイシヨン | Automatic gain controller |
-
1979
- 1979-09-13 JP JP11851279A patent/JPS5642411A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59182681A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Micro Comput Eng Ltd | Television receiver |
| JPS618232A (en) * | 1984-06-20 | 1986-01-14 | Daido Kogyo Co Ltd | Manufacture of sprocket for bicycles and motor-cycles |
| JPS62236290A (en) * | 1986-03-27 | 1987-10-16 | アールシーエー トムソン ライセンシング コーポレイシヨン | Automatic gain controller |
| JP2517267B2 (en) * | 1986-03-27 | 1996-07-24 | アールシーエー トムソン ライセンシング コーポレイシヨン | Automatic gain control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6316951B2 (en) | 1988-04-12 |
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