JPS54157433A - Channel selecting device containing automatic station searching function - Google Patents
Channel selecting device containing automatic station searching functionInfo
- Publication number
- JPS54157433A JPS54157433A JP6739278A JP6739278A JPS54157433A JP S54157433 A JPS54157433 A JP S54157433A JP 6739278 A JP6739278 A JP 6739278A JP 6739278 A JP6739278 A JP 6739278A JP S54157433 A JPS54157433 A JP S54157433A
- Authority
- JP
- Japan
- Prior art keywords
- synchronous
- circuit
- amplifier
- signals
- pulses
- 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
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE: To prevent occurrence of the malfunction caused by the external noise by applying the pulses synchronizing with the synchronous pulses so that the rectifier circuit may operate only for the period of the synchronous signals extracted by the differential amplifier.
CONSTITUTION: In synchronous signal detecting/smoothing circuit 20 which converts the synchronous signals into the control signals to stop the variation, the composite signals are applied to transistor TR1 of differntial amplifier 28 with installation of synchronous signal extraction level deciding variable resistor VR1 at TR2. And the synchrouns pulses extracted at amplifier 28 are applied to rectifier circuit 29. circuit 29 possesses the synchronous pulse to the synchronous signal as the power supply, and the output voltage of circuit 29 is suppled to comparator 25 to be compared with the reference voltage E. Then the output of comparator 25 is applied to the control unit. Thus, pulse P2 synchronizing with the synchronous pulse is applied so that circuit 29 may operate only for the period of the synchronous signals extracted at amplifier 28 in order to prevent occurrence of the mal function caused by the external noise.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6739278A JPS54157433A (en) | 1978-06-01 | 1978-06-01 | Channel selecting device containing automatic station searching function |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6739278A JPS54157433A (en) | 1978-06-01 | 1978-06-01 | Channel selecting device containing automatic station searching function |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54157433A true JPS54157433A (en) | 1979-12-12 |
Family
ID=13343653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6739278A Pending JPS54157433A (en) | 1978-06-01 | 1978-06-01 | Channel selecting device containing automatic station searching function |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54157433A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5455636A (en) * | 1991-12-13 | 1995-10-03 | Thomson Consumer Electronics, Inc. | Detector circuit for use in a VCR |
-
1978
- 1978-06-01 JP JP6739278A patent/JPS54157433A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5455636A (en) * | 1991-12-13 | 1995-10-03 | Thomson Consumer Electronics, Inc. | Detector circuit for use in a VCR |
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