JPS5597012A - Signal switching circuit - Google Patents

Signal switching circuit

Info

Publication number
JPS5597012A
JPS5597012A JP129179A JP129179A JPS5597012A JP S5597012 A JPS5597012 A JP S5597012A JP 129179 A JP129179 A JP 129179A JP 129179 A JP129179 A JP 129179A JP S5597012 A JPS5597012 A JP S5597012A
Authority
JP
Japan
Prior art keywords
signal
transistor
vtr
deterioration
supplied
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
JP129179A
Other languages
Japanese (ja)
Inventor
Tsuneo Tateshimo
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP129179A priority Critical patent/JPS5597012A/en
Publication of JPS5597012A publication Critical patent/JPS5597012A/en
Pending legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE: To avoid the deterioration of the picture quality S/N caused by the mode of VTR or the like, the crosstalk occurrence and others by switching the signal routes via the transistor of differential structure and the like.
CONSTITUTION: When transistor 30 is cut off with the control signal featuring a low level, the base potential of transistor 32 increases. Thus transistors 32 and 31 are turned on and off respectively since the base potential of differentially-connected transistor 31 is lowered by the voltage caused by diode D1. Then constant current I flows via resistance 23, and only signal S2 amplified via transistors 20 and 21 is supplied to load 26 with the supply of signal S1 blocked. In the same way, only signal S1 is supplied to load 26 when the control signal is set to a high level. And thus the signal route is switched to the prescribed route at the mode switching time of the VTR or the like to secure the identical characteristics for the signal routes. As a result, the deterioration of S/N, occurrence of the crosstalk and others can be avoided. At the same time, the effect of the temperature can be prevented owing to the differential structure.
COPYRIGHT: (C)1980,JPO&Japio
JP129179A 1979-01-12 1979-01-12 Signal switching circuit Pending JPS5597012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP129179A JPS5597012A (en) 1979-01-12 1979-01-12 Signal switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP129179A JPS5597012A (en) 1979-01-12 1979-01-12 Signal switching circuit

Publications (1)

Publication Number Publication Date
JPS5597012A true JPS5597012A (en) 1980-07-23

Family

ID=11497351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP129179A Pending JPS5597012A (en) 1979-01-12 1979-01-12 Signal switching circuit

Country Status (1)

Country Link
JP (1) JPS5597012A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5065209A (en) * 1973-10-11 1975-06-02

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5065209A (en) * 1973-10-11 1975-06-02

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