JPS54150016A - Channel selector - Google Patents

Channel selector

Info

Publication number
JPS54150016A
JPS54150016A JP5922078A JP5922078A JPS54150016A JP S54150016 A JPS54150016 A JP S54150016A JP 5922078 A JP5922078 A JP 5922078A JP 5922078 A JP5922078 A JP 5922078A JP S54150016 A JPS54150016 A JP S54150016A
Authority
JP
Japan
Prior art keywords
frequency
pll
reception
desiring
output
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
JP5922078A
Other languages
Japanese (ja)
Other versions
JPS5937892B2 (en
Inventor
Yoichi Sakamoto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP53059220A priority Critical patent/JPS5937892B2/en
Priority to US06/037,332 priority patent/US4271434A/en
Priority to DE19792920180 priority patent/DE2920180A1/en
Priority to CA327,829A priority patent/CA1132272A/en
Priority to GB7917152A priority patent/GB2025172B/en
Publication of JPS54150016A publication Critical patent/JPS54150016A/en
Publication of JPS5937892B2 publication Critical patent/JPS5937892B2/en
Expired legal-status Critical Current

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
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers
    • H03J7/285—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To solve the problem of the noise interference at the AFT time by selecting the frequency near the transmission frequency desiring reception via the PLL frequency synthesizer and retrieving the transmission wave based on the selected frequency to convert the reception system from the PLL system to the search tuning system. CONSTITUTION:The channel selector of the TV picture receiver or the like possessing the loop forming the PLL frequency synthesizer which generated the local oscillation frequency corresponding to the frequency near the electric wave of the transmission station desiring the reception plus the searth tuning system comprising local oscillator 21, mixer 31 and others. In such channel selector, voltage adder 70 which adds the output of voltage integrator 37 of the search turning system under the fine adjustment possible sweep state at the output of low-pass filter 26 forming the PLL loop. Then the output of adder 70 is applied to oscillator 21 and high frequency amplifier 39, and the PLL is turned to the open loop when the voltage of amplifier 39 reaches the level corresponding to the frequency near the reception desiring frequency. After this, the transmission wave is searched through the search turning system to secure the turning state.
JP53059220A 1978-05-17 1978-05-17 Channel selection device Expired JPS5937892B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP53059220A JPS5937892B2 (en) 1978-05-17 1978-05-17 Channel selection device
US06/037,332 US4271434A (en) 1978-05-17 1979-05-09 Channel selector
DE19792920180 DE2920180A1 (en) 1978-05-17 1979-05-16 CHANNEL SELECTION
CA327,829A CA1132272A (en) 1978-05-17 1979-05-17 Channel selector
GB7917152A GB2025172B (en) 1978-05-17 1979-05-17 Channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53059220A JPS5937892B2 (en) 1978-05-17 1978-05-17 Channel selection device

Publications (2)

Publication Number Publication Date
JPS54150016A true JPS54150016A (en) 1979-11-24
JPS5937892B2 JPS5937892B2 (en) 1984-09-12

Family

ID=13107069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53059220A Expired JPS5937892B2 (en) 1978-05-17 1978-05-17 Channel selection device

Country Status (1)

Country Link
JP (1) JPS5937892B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194409A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device
JPS63159927U (en) * 1987-04-09 1988-10-19

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5176901A (en) * 1974-09-25 1976-07-03 Texas Instruments Inc HOSOJUSHINKIDOCHOSOCHI
JPS52123114A (en) * 1976-04-09 1977-10-17 Fujitsu Ten Ltd Automatic channel selector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5176901A (en) * 1974-09-25 1976-07-03 Texas Instruments Inc HOSOJUSHINKIDOCHOSOCHI
JPS52123114A (en) * 1976-04-09 1977-10-17 Fujitsu Ten Ltd Automatic channel selector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194409A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device
JPS63159927U (en) * 1987-04-09 1988-10-19

Also Published As

Publication number Publication date
JPS5937892B2 (en) 1984-09-12

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