JPS55109078A - Signal switching circuit - Google Patents

Signal switching circuit

Info

Publication number
JPS55109078A
JPS55109078A JP1630679A JP1630679A JPS55109078A JP S55109078 A JPS55109078 A JP S55109078A JP 1630679 A JP1630679 A JP 1630679A JP 1630679 A JP1630679 A JP 1630679A JP S55109078 A JPS55109078 A JP S55109078A
Authority
JP
Japan
Prior art keywords
camera
cut
circuit
signal output
signal
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
JP1630679A
Other languages
Japanese (ja)
Inventor
Yoshikazu Hirose
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP1630679A priority Critical patent/JPS55109078A/en
Publication of JPS55109078A publication Critical patent/JPS55109078A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the projection of both the VTR reproduction picture and the camera picture images on the view finder through the automatic switching, by giving the ON/OFF control to the bias change-over switching element by the differential action of the differential amplifier provided previously.
CONSTITUTION: The camera signal sent from camera signal output circuit 1 is supplied to the base of differential amplifying transistor Tr4 and then amplified through camera signal output Tr2 to be supplied to camera/VTR signal output Tr1. The camera signal is then supplied to VTR signal output circuit 2 via resistance R9 to be recorded as well as projected onto the screen of view finder 3. In this case, base bias change-over Tr3 is cut off. The reproduction signal sent from circuit 2 is applied to Tr1 via resistance R9 and then to Tr6 of differential amplifier 5 via time constant circuit 4. As a result, Tr6 is cut off and Tr5 is turned on and Tr2 is also cut off. Thus the signal of circuit 1 is cut off, and only the reproduction signal is applied to finder 3 to secure the projection of the reproduced picture image onto the screen.
COPYRIGHT: (C)1980,JPO&Japio
JP1630679A 1979-02-14 1979-02-14 Signal switching circuit Pending JPS55109078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1630679A JPS55109078A (en) 1979-02-14 1979-02-14 Signal switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1630679A JPS55109078A (en) 1979-02-14 1979-02-14 Signal switching circuit

Publications (1)

Publication Number Publication Date
JPS55109078A true JPS55109078A (en) 1980-08-21

Family

ID=11912845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1630679A Pending JPS55109078A (en) 1979-02-14 1979-02-14 Signal switching circuit

Country Status (1)

Country Link
JP (1) JPS55109078A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745478A (en) * 1985-08-01 1988-05-17 Nintendo Co., Ltd. RF switch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49119569A (en) * 1973-03-15 1974-11-15
JPS5337415B1 (en) * 1969-08-26 1978-10-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337415B1 (en) * 1969-08-26 1978-10-09
JPS49119569A (en) * 1973-03-15 1974-11-15

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745478A (en) * 1985-08-01 1988-05-17 Nintendo Co., Ltd. RF switch

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