JPS5520091A - Electronic channel selector - Google Patents

Electronic channel selector

Info

Publication number
JPS5520091A
JPS5520091A JP8322579A JP8322579A JPS5520091A JP S5520091 A JPS5520091 A JP S5520091A JP 8322579 A JP8322579 A JP 8322579A JP 8322579 A JP8322579 A JP 8322579A JP S5520091 A JPS5520091 A JP S5520091A
Authority
JP
Japan
Prior art keywords
signal
oscillator
code
divider
ram17
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
JP8322579A
Other languages
Japanese (ja)
Inventor
Tadao Sasaki
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 JP8322579A priority Critical patent/JPS5520091A/en
Publication of JPS5520091A publication Critical patent/JPS5520091A/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
    • H03J5/0272—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 used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
    • H03J5/0281—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 used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer the digital values being held in an auxiliary non erasable memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To realize the fine tuning by means of the high-stability reference oscillator by generating the code signal from ROM correcponding to the operation of the channel selecting means to store the signal in RAM, altering the contents of RAM and then delivering the code signal to decide the division ratio of the variable divider. CONSTITUTION:Variable divider 8 controls the division ratio by the code signal and supplies the output signal of the local oscillator 6 transmitted via divider 8 and the output signal of reference oscillator 9 to frequency phase comparator 10 to apply the comparison output to oscillator 6 in the form of the oscillation frequency control signal. ROM15 generates the code signals in accordance with the operation of the channel selecting means, stores part of the code signals to RAM17, alters the contents of RAM17 and then decides the division ratio of divider 8 with the code signals via at least part of RAM17. Thus the fine tuning becomes possible by using the crystal oscillator featuring a high stability for the reference oscillator.
JP8322579A 1979-06-29 1979-06-29 Electronic channel selector Pending JPS5520091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8322579A JPS5520091A (en) 1979-06-29 1979-06-29 Electronic channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8322579A JPS5520091A (en) 1979-06-29 1979-06-29 Electronic channel selector

Publications (1)

Publication Number Publication Date
JPS5520091A true JPS5520091A (en) 1980-02-13

Family

ID=13796367

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8322579A Pending JPS5520091A (en) 1979-06-29 1979-06-29 Electronic channel selector

Country Status (1)

Country Link
JP (1) JPS5520091A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02304425A (en) * 1989-05-04 1990-12-18 American Teleph & Telegr Co <Att> Laser controller for laser tuning of local oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02304425A (en) * 1989-05-04 1990-12-18 American Teleph & Telegr Co <Att> Laser controller for laser tuning of local oscillator

Similar Documents

Publication Publication Date Title
JPS55663A (en) Frequency synthesizer
JPS54102814A (en) Synthesizer receiver
GB1173203A (en) Improvements in or relating to Variable Frequency Crystal Stabilised Signal Generators
JPS5520091A (en) Electronic channel selector
JPS57140034A (en) Phase synchronizing oscillator
JPS5613834A (en) Synthesizer tuner
EP0206247A3 (en) Pll frequency synthesizer
JPS55132108A (en) Sweep signal generator
JPS55664A (en) Frequency synthesizer
JPS5477004A (en) Channel selector
JPS5451715A (en) Channel selector
JPS5730425A (en) Channel selector
JPS6455911A (en) Frequency synthesizer
DE3870049D1 (en) OSCILLATOR DEVICE FOR GENERATING AT LEAST TWO DIFFERENT FREQUENCIES.
JPS55118234A (en) Fm receiver
JPS5599844A (en) Frequency synthesizer
JPS55662A (en) Channel selection device
JPS5763936A (en) Phase-locked loop
JPS5676640A (en) Receiver of frequency synthesizer system
JPS57123718A (en) Electronic channel selector
JPS54121610A (en) Pll circuit of radio receiver
JPS5568742A (en) Phase lock oscillator circuit
JPS5483754A (en) Pll frequency synthesizer system
GB1191433A (en) Improvements in or relating to Frequency Synthesisers.
JPS5784629A (en) Channel selection circuit