JPS5741024A - Automatic phase controlling circuit - Google Patents
Automatic phase controlling circuitInfo
- Publication number
- JPS5741024A JPS5741024A JP55116069A JP11606980A JPS5741024A JP S5741024 A JPS5741024 A JP S5741024A JP 55116069 A JP55116069 A JP 55116069A JP 11606980 A JP11606980 A JP 11606980A JP S5741024 A JPS5741024 A JP S5741024A
- Authority
- JP
- Japan
- Prior art keywords
- loop
- phase
- signal
- controlling circuit
- low
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
- H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
Landscapes
- Television Receiver Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To remove a phase distortion of a video signal of a TV set having an automatic phase controlling circuit, by providing a means for changing the AC loop gains by changing over a switching circuit provided in the loop through which a phase error signal passes. CONSTITUTION:This TV set is provided with a means for switching a variable means of the AC loop gains provided in the loop through which a phase error signal passes, of an automatic phase controlling circuit for controlling the local frequency so as to synchronize in phase with a reference signal, by a switching control signal synchronizing with a synchronizing signal in a video signal. When a traveling contact (a) of a changeover switch SW is switched to a fixed contact (b) or (c), the first low-pass containing resistances R1, R2, or the second low-pass filter containing resistances R3, R2 is constituted. Also, the resistance value of the resistance R3 is made higher than that of R1 in advance, so that one of the first and second low-pass filters is selectively switched as a loop filter by a switching control signal from the outside.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55116069A JPS5741024A (en) | 1980-08-23 | 1980-08-23 | Automatic phase controlling circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55116069A JPS5741024A (en) | 1980-08-23 | 1980-08-23 | Automatic phase controlling circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5741024A true JPS5741024A (en) | 1982-03-06 |
JPS6340368B2 JPS6340368B2 (en) | 1988-08-10 |
Family
ID=14677933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55116069A Granted JPS5741024A (en) | 1980-08-23 | 1980-08-23 | Automatic phase controlling circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5741024A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5252488U (en) * | 1975-10-14 | 1977-04-14 | ||
JPS53127215A (en) * | 1977-04-13 | 1978-11-07 | Torio Kk | Synthesizer tuner |
-
1980
- 1980-08-23 JP JP55116069A patent/JPS5741024A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5252488U (en) * | 1975-10-14 | 1977-04-14 | ||
JPS53127215A (en) * | 1977-04-13 | 1978-11-07 | Torio Kk | Synthesizer tuner |
Also Published As
Publication number | Publication date |
---|---|
JPS6340368B2 (en) | 1988-08-10 |
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