JPS577637A - Channel selector on synthesizer system - Google Patents

Channel selector on synthesizer system

Info

Publication number
JPS577637A
JPS577637A JP8181680A JP8181680A JPS577637A JP S577637 A JPS577637 A JP S577637A JP 8181680 A JP8181680 A JP 8181680A JP 8181680 A JP8181680 A JP 8181680A JP S577637 A JPS577637 A JP S577637A
Authority
JP
Japan
Prior art keywords
circuit
output
bcd
address
setting
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
JP8181680A
Other languages
Japanese (ja)
Inventor
Kazuharu Nishitani
Hiroshi Kobayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8181680A priority Critical patent/JPS577637A/en
Publication of JPS577637A publication Critical patent/JPS577637A/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

Abstract

PURPOSE:To eliminate the decoder circuit of a channel selector by using a BCD counter for setting the address of a memory circuit and by using BCD codes as the data of a latch circuit which loads data to this address-setting BCD counter. CONSTITUTION:A phase comparator 2 compares the output of a local oscillator 4 with the output obtained by frequency-diving the output thereof by a programmable frequency divider 5 and the output of the comparator 2 is applied to a local oscillator 4 via a low-pass filter 3. To the programmable frequency divider 5, a memory circuit 6 which supplies frequency-division ratio data of a reception channel is connected and to the address setting circuit 7 of the memory circuit 6, the 1st BCD counters 21 and 22 and the 2nd BCD counter (latch) storing ten-key inputs temporarily are also connected. Consequently, a decoder circuit for the ten-key inputs during direct channel selection is eliminated and the simple circuitry makes direct channel selections.
JP8181680A 1980-06-16 1980-06-16 Channel selector on synthesizer system Pending JPS577637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8181680A JPS577637A (en) 1980-06-16 1980-06-16 Channel selector on synthesizer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8181680A JPS577637A (en) 1980-06-16 1980-06-16 Channel selector on synthesizer system

Publications (1)

Publication Number Publication Date
JPS577637A true JPS577637A (en) 1982-01-14

Family

ID=13757013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8181680A Pending JPS577637A (en) 1980-06-16 1980-06-16 Channel selector on synthesizer system

Country Status (1)

Country Link
JP (1) JPS577637A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5440017A (en) * 1977-09-06 1979-03-28 Alps Electric Co Ltd Channel selector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5440017A (en) * 1977-09-06 1979-03-28 Alps Electric Co Ltd Channel selector

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