JPS57123718A - Electronic channel selector - Google Patents

Electronic channel selector

Info

Publication number
JPS57123718A
JPS57123718A JP917581A JP917581A JPS57123718A JP S57123718 A JPS57123718 A JP S57123718A JP 917581 A JP917581 A JP 917581A JP 917581 A JP917581 A JP 917581A JP S57123718 A JPS57123718 A JP S57123718A
Authority
JP
Japan
Prior art keywords
frequency divider
channel
signal
output
amplitude
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.)
Pending
Application number
JP917581A
Other languages
Japanese (ja)
Inventor
Mitsumasa Saito
Shinobu Tsurumaru
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP917581A priority Critical patent/JPS57123718A/en
Publication of JPS57123718A publication Critical patent/JPS57123718A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0254—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being transfered to a D/A converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To prevent the malfunction of a front frequency divider by inserting a filter, which attenuates a higher-harmonic component contained in a local oscillation output, between the amplitude-limiting amplifier and front frequency divider of a PLL frequency synthesizer channel-selecting circuit. CONSTITUTION:A power-source switching circuit 4 is controlled by an U/V switching control signal from a channel-selecting operation part 3 to put an UHF local oscillator 1 or a VHF local oscillator 2 in operation, and its output is inputted to an amplitude-limiting amplifier 7 through a filter 5 or 6. A signal processed through the amplitude-limitation of the amplifier is removed from higher harmonic through a higer-harmonic removing filter 13 and inputted to a front frequency divider 8. A signal whose frequency is divided by N by the frequency divider 8 is further divided by a variable frequency divider 9 at a frequency-division ratio 1/n which corresponds to the channel selection signal T of the channel-selecting operation part 3, and its output is compared with a signal from a reference oscillator 11 by a phase comparator 10. The output of the comparator 10 is supplied as a channel selection signal VC to the oscillator 1 or 2 through an LPF12. The outputs of the oscillators 1 and 2 are supplied to a mixer respectively.
JP917581A 1981-01-24 1981-01-24 Electronic channel selector Pending JPS57123718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP917581A JPS57123718A (en) 1981-01-24 1981-01-24 Electronic channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP917581A JPS57123718A (en) 1981-01-24 1981-01-24 Electronic channel selector

Publications (1)

Publication Number Publication Date
JPS57123718A true JPS57123718A (en) 1982-08-02

Family

ID=11713230

Family Applications (1)

Application Number Title Priority Date Filing Date
JP917581A Pending JPS57123718A (en) 1981-01-24 1981-01-24 Electronic channel selector

Country Status (1)

Country Link
JP (1) JPS57123718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009001307A (en) * 2007-06-22 2009-01-08 Rinnai Corp Packing box

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009001307A (en) * 2007-06-22 2009-01-08 Rinnai Corp Packing box

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