JPS55639A - Channel selection device - Google Patents

Channel selection device

Info

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
Application number
JP7318778A
Other languages
Japanese (ja)
Other versions
JPS6043689B2 (en
Inventor
Takeshi Shima
Kenichi Torii
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7318778A priority Critical patent/JPS6043689B2/en
Publication of JPS55639A publication Critical patent/JPS55639A/en
Publication of JPS6043689B2 publication Critical patent/JPS6043689B2/en
Expired legal-status Critical Current

Links

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.
JP7318778A 1978-06-19 1978-06-19 Channel selection device Expired JPS6043689B2 (en)

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)

Also Published As

Publication number Publication date
JPS6043689B2 (en) 1985-09-30

Similar Documents

Publication Publication Date Title
JPS55639A (en) Channel selection device
JPS55640A (en) Channel selection device
JPS5613834A (en) Synthesizer tuner
JPS55132108A (en) Sweep signal generator
JPS5357914A (en) Synchronous oscillator
JPS5477004A (en) Channel selector
JPS5451715A (en) Channel selector
JPS5466757A (en) Pll system
JPS5661833A (en) Phase synchronous oscillating circuit
JPS5333038A (en) Phase synchronizing oscillator
JPS5568742A (en) Phase lock oscillator circuit
JPS54154211A (en) Local oscillation circuit
JPS55121180A (en) Electronic watch
JPS55662A (en) Channel selection device
JPS5732133A (en) Phase-synchronous oscillator
JPS55161415A (en) Tuner
JPS55162605A (en) Fm modulation unit
JPS54118759A (en) Synthesized oscillator for radio device
JPS5578638A (en) Television picture receiver
JPS54121610A (en) Pll circuit of radio receiver
JPS561615A (en) Channel selecting device
JPS5542050A (en) Electronic watch containing radio receiving function
JPS55118234A (en) Fm receiver
JPS53148946A (en) Voltage control oscillation circuit
JPS5784695A (en) Control circuit for transmission frequency