JPS5446579A - Time correcting mechanism - Google Patents
Time correcting mechanismInfo
- Publication number
- JPS5446579A JPS5446579A JP11269877A JP11269877A JPS5446579A JP S5446579 A JPS5446579 A JP S5446579A JP 11269877 A JP11269877 A JP 11269877A JP 11269877 A JP11269877 A JP 11269877A JP S5446579 A JPS5446579 A JP S5446579A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- oscillator
- counter
- rom
- corrected
- 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
Links
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G3/00—Producing timing pulses
- G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
- G04G3/022—Circuits for deriving low frequency timing pulses from pulses of higher frequency the desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
PURPOSE:To compensate the dispersion of a guartz oscillator in a circuit manner by comparing the output frequency of the oscillator, which is stored in an ROM, with a designed frequency with the use of a subtracting counter so that the counted value of a time counting counter may be corrected. CONSTITUTION:A programmer valve ROM 2 is stored with the frequency of an oscillator 1, in which the difference between the frequency from a quartz oscillator 1 and a designed frequency takes a value of 1. The frequency read out of the ROM 2 is compared with the frequency of the oscillator 1 by a subtracting counter 3. If there is coincidence inbetween, and AND gate G1 is opened in response to the coincidence pulses of the counter 3 so that similar comparisons are repeated and that the ROM 2 generates code pulses in accordance with the gain or loss. Thus, one of the subtraction gates G3 and G2 is opened, and a time counting fundamental counter 5, which can be subjected to addition or subtraction, is corrected in its factor 1 so that dispersion of the oscillator can be corrected in a circuit manner thereby to effect the correct time counting operation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52112698A JPS6041749B2 (en) | 1977-09-21 | 1977-09-21 | Time correction mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52112698A JPS6041749B2 (en) | 1977-09-21 | 1977-09-21 | Time correction mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5446579A true JPS5446579A (en) | 1979-04-12 |
JPS6041749B2 JPS6041749B2 (en) | 1985-09-18 |
Family
ID=14593247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52112698A Expired JPS6041749B2 (en) | 1977-09-21 | 1977-09-21 | Time correction mechanism |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6041749B2 (en) |
-
1977
- 1977-09-21 JP JP52112698A patent/JPS6041749B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6041749B2 (en) | 1985-09-18 |
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