JPH01129919U - - Google Patents

Info

Publication number
JPH01129919U
JPH01129919U JP1988025522U JP2552288U JPH01129919U JP H01129919 U JPH01129919 U JP H01129919U JP 1988025522 U JP1988025522 U JP 1988025522U JP 2552288 U JP2552288 U JP 2552288U JP H01129919 U JPH01129919 U JP H01129919U
Authority
JP
Japan
Prior art keywords
voltage
transistor
tuning
supplied
collector
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
JP1988025522U
Other languages
English (en)
Other versions
JPH0724813Y2 (ja
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 filed Critical
Priority to JP1988025522U priority Critical patent/JPH0724813Y2/ja
Priority to US07/312,947 priority patent/US4891708A/en
Priority to GB8904032A priority patent/GB2216352B/en
Priority to DE3905860A priority patent/DE3905860A1/de
Priority to KR1019890002304A priority patent/KR930002042B1/ko
Publication of JPH01129919U publication Critical patent/JPH01129919U/ja
Application granted granted Critical
Publication of JPH0724813Y2 publication Critical patent/JPH0724813Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
    • H03J7/10—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Description

【図面の簡単な説明】
第１図はこの考案に係る電子同調チユーナの電
圧重畳回路の一実施例を示す回路図、第２図、第
３図、第４図はこの考案の動作を説明するための
説明図、第５図は同調電圧対パルスデユーテイー
比特性を示す特性図、第６図はこの考案の他の実
施例を示す回路図、第７図はＡＦＴ電圧の特性図
、第８図は電子同調チユーナの要部構成を示す構
成図、第９図は従来の電圧重畳回路の一例を示す
回路図、第１０図は他の従来例を示す回路図、第
１１図は電子同調チユーナのキヤリブレーシヨン
特性を示す特性図である。 １１…電子同調チユーナ、１２…選局パルス信
号入力端子、１３…ＡＦＴ電圧入力端子、Ｑ１１
…第１のトランジスタ、Ｑ２３…第２のトランジ
スタ、Ｒ１１…負荷抵抗、Ｒ１２…抵抗、Ｃ１１
…コンデンサ。

Claims (1)

  1. 【実用新案登録請求の範囲】 (1) 同調電圧端子を有し、この同調電圧端子に
    、選局用の電圧と自動周波数調整用のＡＦＴ電圧
    とを重畳して供給するようにした電子同調チユー
    ナにおいて、 前記選局用電圧を得るためのパルス信号がベー
    スに供給され、コレクタを負荷抵抗を介して電圧
    源に接続し、エミツタを基準電位点に接続したス
    イツチング用の第１のトランジスタと、 前記電圧源に直流的に結合され前記第１のトラ
    ンジスタのスイツチング動作に応じて充・放電が
    行われるようにしたコンデンサを含み、前記第１
    のトランジスタのコレクタに現われるパルス信号
    を整流平滑して前記同調電圧端子に供給する電圧
    供給手段と、 前記ＡＦＴ電圧に比例した直流電圧がベースに
    供給され、コレクタ・エミツタ主電流路を前記コ
    ンデンサの充放電経路と基準電位点間に接続した
    第２のトランジスタとを具備して成る電子同調チ
    ユーナの電圧重畳回路。 (2) 第２のトランジスタの主電流路を流れる電
    流を受信バンドに応じて切換える手段を有する請
    求項１記載の電子同調チユーナの電圧重畳回路。
JP1988025522U 1988-02-26 1988-02-26 電子同調チューナの電圧重畳回路 Expired - Lifetime JPH0724813Y2 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1988025522U JPH0724813Y2 (ja) 1988-02-26 1988-02-26 電子同調チューナの電圧重畳回路
US07/312,947 US4891708A (en) 1988-02-26 1989-02-21 Voltage superposing circuit for an electronic tuner
GB8904032A GB2216352B (en) 1988-02-26 1989-02-22 Voltage superposing circuit for an electronic tuner
DE3905860A DE3905860A1 (de) 1988-02-26 1989-02-24 Spannungsueberlagerungsschaltung fuer einen elektronischen kanalwaehler oder tuner
KR1019890002304A KR930002042B1 (ko) 1988-02-26 1989-02-25 전자동조 튜너용 전압 중첩회로

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988025522U JPH0724813Y2 (ja) 1988-02-26 1988-02-26 電子同調チューナの電圧重畳回路

Publications (2)

Publication Number Publication Date
JPH01129919U true JPH01129919U (ja) 1989-09-05
JPH0724813Y2 JPH0724813Y2 (ja) 1995-06-05

Family

ID=12168390

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988025522U Expired - Lifetime JPH0724813Y2 (ja) 1988-02-26 1988-02-26 電子同調チューナの電圧重畳回路

Country Status (5)

Country Link
US (1) US4891708A (ja)
JP (1) JPH0724813Y2 (ja)
KR (1) KR930002042B1 (ja)
DE (1) DE3905860A1 (ja)
GB (1) GB2216352B (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294830A (en) * 1993-08-13 1996-05-08 Nec Corp Frequency synthesizer
KR0138330B1 (ko) * 1994-02-07 1998-05-15 김광호 방송수신기의 디지탈 전압튜닝방법
JP3631037B2 (ja) * 1999-03-18 2005-03-23 アルプス電気株式会社 テレビジョンチューナー
US6396550B1 (en) * 1999-11-05 2002-05-28 Samsung Electronics Co., Ltd. Method and device for precision tuning, and method and device for matching vestigial sideband signal in television

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53108219A (en) * 1977-03-03 1978-09-20 Toshiba Corp Channel selection device
JPS57182934U (ja) * 1981-05-15 1982-11-19

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591858A (en) * 1968-05-31 1971-07-06 Beckman Instruments Inc Pulse rate to analog converter
US3858000A (en) * 1972-12-04 1974-12-31 Warwick Electronics Inc Extended range afc system
US4344187A (en) * 1979-10-18 1982-08-10 Nippon Gakki Seizo Kabushiki Kaisha Radio receiver with system for maintaining optimum tuning
US4450587A (en) * 1981-11-27 1984-05-22 Rca Corporation Tuning arrangement for providing relatively uniform automatic fine tuning sensitivity
JPS59215113A (ja) * 1983-05-23 1984-12-05 Victor Co Of Japan Ltd テレビジヨン信号受信装置のａｆｃ回路
US4748684A (en) * 1986-06-03 1988-05-31 Information Resources, Inc. Fast tuning control for a television system
US4814887A (en) * 1988-05-23 1989-03-21 General Instrument Corporation Automatic frequency control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53108219A (en) * 1977-03-03 1978-09-20 Toshiba Corp Channel selection device
JPS57182934U (ja) * 1981-05-15 1982-11-19

Also Published As

Publication number Publication date
GB8904032D0 (en) 1989-04-05
DE3905860C2 (ja) 1992-08-27
US4891708A (en) 1990-01-02
DE3905860A1 (de) 1989-09-07
GB2216352B (en) 1992-01-22
KR930002042B1 (ko) 1993-03-22
GB2216352A (en) 1989-10-04
JPH0724813Y2 (ja) 1995-06-05
KR890013886A (ko) 1989-09-26

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