JPS55639A - Channel selection device - Google Patents
Channel selection deviceInfo
- Publication number
- JPS55639A JPS55639A JP7318778A JP7318778A JPS55639A JP S55639 A JPS55639 A JP S55639A JP 7318778 A JP7318778 A JP 7318778A JP 7318778 A JP7318778 A JP 7318778A JP S55639 A JPS55639 A JP S55639A
- Authority
- JP
- Japan
- Prior art keywords
- local oscillator
- oscillator
- fine adjustment
- division circuit
- 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
- 239000013078 crystal Substances 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/197—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To obtain a stable picture image although the input frequency arrives with a shift by securing an automatic fine adjustment for the local oscillator with the AFT output and via the variable division circuit. CONSTITUTION:The output signal of local oscillator 12 is divided through variable division circuit 49, applied to phase comparator 17 to be given the phase comparison with the oscillation frequency of highly stable reference oscillator 16 such as the crystal oscillator, and then fed back to local oscillator 12. The fine adjustment using the output voltage of AFT31 is carried out by changing the value of up-down counter 29 and then the division ratio of divider 14.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7318778A JPS6043689B2 (en) | 1978-06-19 | 1978-06-19 | Channel selection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7318778A JPS6043689B2 (en) | 1978-06-19 | 1978-06-19 | Channel selection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55639A true JPS55639A (en) | 1980-01-07 |
JPS6043689B2 JPS6043689B2 (en) | 1985-09-30 |
Family
ID=13510876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7318778A Expired JPS6043689B2 (en) | 1978-06-19 | 1978-06-19 | Channel selection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6043689B2 (en) |
-
1978
- 1978-06-19 JP JP7318778A patent/JPS6043689B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6043689B2 (en) | 1985-09-30 |
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