JPS5583066A - Function generator - Google Patents

Function generator

Info

Publication number
JPS5583066A
JPS5583066A JP15662878A JP15662878A JPS5583066A JP S5583066 A JPS5583066 A JP S5583066A JP 15662878 A JP15662878 A JP 15662878A JP 15662878 A JP15662878 A JP 15662878A JP S5583066 A JPS5583066 A JP S5583066A
Authority
JP
Japan
Prior art keywords
change
fetqa
wqb
resistance values
polygonal
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
JP15662878A
Other languages
Japanese (ja)
Inventor
Toshitaka Hirata
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15662878A priority Critical patent/JPS5583066A/en
Publication of JPS5583066A publication Critical patent/JPS5583066A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To electrically change the grades of polygons by letting the impedance elements which determine the grades of the respective plural polygonal points for determining the characteristic curves of the output video signal levels for input image information be controllable impedance elements whose impedances change in response to the control signals.
CONSTITUTION: A polygonal line function generator 11 is constituted by operational amplifiers OP1WOP3, variable resistors VR1WVRBN, diodes D1WDn, P-FETQA1W AAB, N-FETQB1WQBn and amplifiers AM1WAMn and the P-FETQA1WQAn and N-FETQN1WQBn are used as controllable impedances. The voltage at the respective polygonal points are determined by regulating variable resistances VRB1WVRBn. The inclinations at the polygonal points are determined by the ratios between the resistance values of the P-FETQA1WQAn and the resistance values of the N- FETQB1WQBn but the resistance values change in the opposite directions with the change in the bias voltage to be applied to their bases and therefore by changing the bias levels the inclinations of the respective polygonal points change.
COPYRIGHT: (C)1980,JPO&Japio
JP15662878A 1978-12-17 1978-12-17 Function generator Pending JPS5583066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15662878A JPS5583066A (en) 1978-12-17 1978-12-17 Function generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15662878A JPS5583066A (en) 1978-12-17 1978-12-17 Function generator

Publications (1)

Publication Number Publication Date
JPS5583066A true JPS5583066A (en) 1980-06-23

Family

ID=15631844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15662878A Pending JPS5583066A (en) 1978-12-17 1978-12-17 Function generator

Country Status (1)

Country Link
JP (1) JPS5583066A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776560A (en) * 1980-10-30 1982-05-13 Canon Inc Processing method of intermediate tone image
JPS5776559A (en) * 1980-10-30 1982-05-13 Canon Inc Processing method of intermediate tone image

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776560A (en) * 1980-10-30 1982-05-13 Canon Inc Processing method of intermediate tone image
JPS5776559A (en) * 1980-10-30 1982-05-13 Canon Inc Processing method of intermediate tone image

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