JPS5752221A - Channel designation system - Google Patents

Channel designation system

Info

Publication number
JPS5752221A
JPS5752221A JP12745380A JP12745380A JPS5752221A JP S5752221 A JPS5752221 A JP S5752221A JP 12745380 A JP12745380 A JP 12745380A JP 12745380 A JP12745380 A JP 12745380A JP S5752221 A JPS5752221 A JP S5752221A
Authority
JP
Japan
Prior art keywords
channel number
bias voltage
voltage
designated
circuit
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
JP12745380A
Other languages
Japanese (ja)
Inventor
Tetsuo Hanazawa
Ryuji Habuka
Keiji Tanaka
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.)
Nippon Telegraph and Telephone Corp
Panasonic Mobile Communications Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Matsushita Communication 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 Nippon Telegraph and Telephone Corp, Matsushita Communication Industrial Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP12745380A priority Critical patent/JPS5752221A/en
Publication of JPS5752221A publication Critical patent/JPS5752221A/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
    • H03J5/0263—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 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)

Abstract

PURPOSE:To simplify a circuit of a device, to change it to an integrated circuit, and to reduce the power consumption by said circuit, by digitally encoding the bias voltage to a VCO by corresponding to a channel number, and writing this encoded voltage to an ROM. CONSTITUTION:When a channel number is designated from a control part of a radio equipment, a CPU4 outputs a data of a data of a designated channel number from an ROM, and supplies it to a D/A converter 3. The D/A converter 3 converts a digital signal to an analog signal, smoothes voltage by a low-pass filter 2, and after that, supplies it as bias voltage to a VCO1, so that the oscillation is executed by the frequency prescribed by the bias voltage. Accordingly, a designated channel frequency is oscillated without requiring a high speed variable frequency divider and a phase comparator, etc.
JP12745380A 1980-09-11 1980-09-11 Channel designation system Pending JPS5752221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12745380A JPS5752221A (en) 1980-09-11 1980-09-11 Channel designation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12745380A JPS5752221A (en) 1980-09-11 1980-09-11 Channel designation system

Publications (1)

Publication Number Publication Date
JPS5752221A true JPS5752221A (en) 1982-03-27

Family

ID=14960293

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12745380A Pending JPS5752221A (en) 1980-09-11 1980-09-11 Channel designation system

Country Status (1)

Country Link
JP (1) JPS5752221A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178641A (en) * 1982-04-12 1983-10-19 Nippon Telegr & Teleph Corp <Ntt> Method for controlling frequency in radio communication system
US6004888A (en) * 1996-07-16 1999-12-21 Teijin Limited Fibrous sheet for structure reinforcement and structure reinforced with same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5264201A (en) * 1975-11-22 1977-05-27 Sony Corp Station selection unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5264201A (en) * 1975-11-22 1977-05-27 Sony Corp Station selection unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178641A (en) * 1982-04-12 1983-10-19 Nippon Telegr & Teleph Corp <Ntt> Method for controlling frequency in radio communication system
US6004888A (en) * 1996-07-16 1999-12-21 Teijin Limited Fibrous sheet for structure reinforcement and structure reinforced with same

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