JPS54157433A - Channel selecting device containing automatic station searching function - Google Patents

Channel selecting device containing automatic station searching function

Info

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
Application number
JP6739278A
Other languages
Japanese (ja)
Inventor
Akio Takada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP6739278A priority Critical patent/JPS54157433A/en
Publication of JPS54157433A publication Critical patent/JPS54157433A/en
Pending legal-status Critical Current

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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
JP6739278A 1978-06-01 1978-06-01 Channel selecting device containing automatic station searching function Pending JPS54157433A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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