JPS57147320A - Speeding-up circuit for channel shift start of channel selector - Google Patents
Speeding-up circuit for channel shift start of channel selectorInfo
- Publication number
- JPS57147320A JPS57147320A JP3269381A JP3269381A JPS57147320A JP S57147320 A JPS57147320 A JP S57147320A JP 3269381 A JP3269381 A JP 3269381A JP 3269381 A JP3269381 A JP 3269381A JP S57147320 A JPS57147320 A JP S57147320A
- Authority
- JP
- Japan
- Prior art keywords
- channel
- circuit
- resistance
- speeding
- channel selection
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/18—Automatic scanning over a band of frequencies
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To perform a channel shift even when the width of a channel selection driving pulse is short, by providing a channel shift start speeding-up circuit. CONSTITUTION:When channel selection driving pulses are supplied to input paths 1 and 2, diodes 49 and 50 turn on to cause a voltage drop across a bis resistance 55, so a transistor 53 turns on to charge a capacitor 24. Since the value of a resistance is small, the cahrging time constant of the capacitor 24 is extremely small during this period. As the channel selection pulses are ceased, the diodes 49 and 50 turn off and a current flows from a power source line 25 through resistances 56 and 51 to a capacitor 54, which is discharged. For this purpose, the resistance 54 of a speeding-up circuit 48 is set much less than the resistance 26 of a time constant setting circuit 5, so that driving is enabled even when the channel selection driving pulses have extremely short width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3269381A JPS57147320A (en) | 1981-03-06 | 1981-03-06 | Speeding-up circuit for channel shift start of channel selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3269381A JPS57147320A (en) | 1981-03-06 | 1981-03-06 | Speeding-up circuit for channel shift start of channel selector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57147320A true JPS57147320A (en) | 1982-09-11 |
| JPS6348452B2 JPS6348452B2 (en) | 1988-09-29 |
Family
ID=12365934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3269381A Granted JPS57147320A (en) | 1981-03-06 | 1981-03-06 | Speeding-up circuit for channel shift start of channel selector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57147320A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100770910B1 (en) | 2006-02-17 | 2007-10-26 | 삼성전자주식회사 | Apparatus and method for improving channel changing speed in digital broadcasting receiving terminal |
-
1981
- 1981-03-06 JP JP3269381A patent/JPS57147320A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100770910B1 (en) | 2006-02-17 | 2007-10-26 | 삼성전자주식회사 | Apparatus and method for improving channel changing speed in digital broadcasting receiving terminal |
| US7872690B2 (en) | 2006-02-17 | 2011-01-18 | Samsung Electronics Co., Ltd | Apparatus and method for improving channel change speed in digital broadcasting reception terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6348452B2 (en) | 1988-09-29 |
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