JPS5541040A - Temperature compensation circuit for channel number counter - Google Patents

Temperature compensation circuit for channel number counter

Info

Publication number
JPS5541040A
JPS5541040A JP11424278A JP11424278A JPS5541040A JP S5541040 A JPS5541040 A JP S5541040A JP 11424278 A JP11424278 A JP 11424278A JP 11424278 A JP11424278 A JP 11424278A JP S5541040 A JPS5541040 A JP S5541040A
Authority
JP
Japan
Prior art keywords
temperature
channel number
number counter
counter
saw
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.)
Granted
Application number
JP11424278A
Other languages
Japanese (ja)
Other versions
JPS5816805B2 (en
Inventor
Toshinori Murata
Shigeo Matsuura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP53114242A priority Critical patent/JPS5816805B2/en
Priority to GB7915165A priority patent/GB2024548B/en
Priority to US06/035,101 priority patent/US4270215A/en
Priority to DE19792918529 priority patent/DE2918529A1/en
Publication of JPS5541040A publication Critical patent/JPS5541040A/en
Publication of JPS5816805B2 publication Critical patent/JPS5816805B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE: To prevent the malfunction of count due to temperature change, by selecting the start point of count for the number of peaks for the signal detecting the output signal of surface acoustic wave element SAW by means of the output of ambient temperature judgement means.
CONSTITUTION: The signal detecting and wave shaping 4 the output of SAW of the channel number counter used for the channel number display unit of TV receiver is inputted to the counter 23. The resistance value of the ambient temperature judgement element thermister 15 is decreased at higher temperatures, the potential of the junction point A is less than the Zener voltage of the Zener diode 20 and the transistor Tr 21 is OFF and the D input of FF22 is at H level. At lower temperature, D input is at L level. The resistor 16, thermister 15 and diode 20 are selected so that ON and OFF of Tr 21 can be changed at temperature of 25°C. The signal of the counter 23 is outputted from the AND circuits 26 and 25 depending on high or low temperature, and it is inputted to the channel number counter 6. Thus, even if low cost material which is not good in temperature performance is used for the SAW substrate, no malfunction is caused.
COPYRIGHT: (C)1980,JPO&Japio
JP53114242A 1978-05-10 1978-09-18 Temperature compensation circuit for channel counting device Expired JPS5816805B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP53114242A JPS5816805B2 (en) 1978-09-18 1978-09-18 Temperature compensation circuit for channel counting device
GB7915165A GB2024548B (en) 1978-05-10 1979-05-01 Preset channel selection apparatus
US06/035,101 US4270215A (en) 1978-05-10 1979-05-01 Channel indicator
DE19792918529 DE2918529A1 (en) 1978-05-10 1979-05-08 PRESET CHANNEL SELECTOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53114242A JPS5816805B2 (en) 1978-09-18 1978-09-18 Temperature compensation circuit for channel counting device

Publications (2)

Publication Number Publication Date
JPS5541040A true JPS5541040A (en) 1980-03-22
JPS5816805B2 JPS5816805B2 (en) 1983-04-02

Family

ID=14632827

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53114242A Expired JPS5816805B2 (en) 1978-05-10 1978-09-18 Temperature compensation circuit for channel counting device

Country Status (1)

Country Link
JP (1) JPS5816805B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0281303U (en) * 1988-12-14 1990-06-22

Also Published As

Publication number Publication date
JPS5816805B2 (en) 1983-04-02

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