JPS6012828A - Frequency synthesizer tuner having automatic adjusting function of radio frequency part - Google Patents

Frequency synthesizer tuner having automatic adjusting function of radio frequency part

Info

Publication number
JPS6012828A
JPS6012828A JP12020283A JP12020283A JPS6012828A JP S6012828 A JPS6012828 A JP S6012828A JP 12020283 A JP12020283 A JP 12020283A JP 12020283 A JP12020283 A JP 12020283A JP S6012828 A JPS6012828 A JP S6012828A
Authority
JP
Japan
Prior art keywords
converter
amplification part
high frequency
broadcasting signal
control voltage
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
JP12020283A
Other languages
Japanese (ja)
Inventor
Tsukasa Yamazaki
山崎　士
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12020283A priority Critical patent/JPS6012828A/en
Publication of JPS6012828A publication Critical patent/JPS6012828A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To adjust easily a tuning characteristic of a high frequency amplification part by controlling variably a tuning element of a selective amplifier in the high frequency amplification part by using a microcomputer so that the intensity of an IF signal is maximized. CONSTITUTION:A broadcasting signal intensity level output 4 is taken out to an A/D converter 5 through the high frequency amplification part 1, a frequency conversion part 2 and an IF amplification part 3 which are constitutional elements of a synthesizer tuner. The output of the A/D converter 5 is sent to the microcomputer 6, the output of the computer 6 is D/A converted by a D/A converter 7 and the analog signal is supplied to the amplification part 1 as a varicap control voltage 8. At that time, the voltage 8 is set up to an initial value and the broadcasting signal intensity is read out by the converter 5 and stored in the computer 6. Subsequently, the voltage 8 is change and the broadcasting signal intensity at that time is read out by the converter 5 and compared with the preceding intensity by the computer 6. If the read out value is larger than the preceding value, the current value is stored, and if smaller, the operation is stopped at that time. Thus, the varicap control voltage is set up to the maximum point of the radio broadcasting signal intensity by repeating said operation.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明はマイクロコンピュータを搭載し、高周波増幅部
の自動調整機能を具したシンセサイザーチューナに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a synthesizer tuner equipped with a microcomputer and equipped with an automatic adjustment function for a high frequency amplification section.

（従来例の構成とその問題点） 近年、同調精度の高さや使いやすさの点から、マイクロ
コンピュータを用いたシンセサイザーチューナがチュー
ナの主流をしめるようになってきた。(Conventional configuration and its problems) In recent years, synthesizer tuners using microcomputers have become the mainstream tuner due to their high tuning accuracy and ease of use.

これらシンセサイザーチューナの高周波増幅部の選択増
幅器の同調特性は、コイルとバリキャップによって得ら
れており、従来このバリキャップの制御電圧は、高周波
信号を中間周波数に下げるために使用される局部発振回
路のＰＬＬ　（フェイズ・ロックド・ループ）部のロー
パスフィルタ出力、つまり局部発振周波数制御電圧をそ
のまま利用していた。The tuning characteristics of the selective amplifier in the high-frequency amplification section of these synthesizer tuners are obtained by a coil and a varicap. Conventionally, the control voltage of this varicap is controlled by a local oscillation circuit used to lower the high-frequency signal to an intermediate frequency. The low-pass filter output of the PLL (phase locked loop) section, that is, the local oscillation frequency control voltage, was used as is.

そのため、中間周波数と局部発振周波数と高周波増幅部
の同調周波数とが常に一定の関係となるように、製造段
階において高周波増幅部の同調特性を整えるトラッキン
グ調整というものが必要であった。Therefore, it was necessary to perform tracking adjustment to adjust the tuning characteristics of the high-frequency amplification section during the manufacturing stage so that the intermediate frequency, local oscillation frequency, and tuning frequency of the high-frequency amplification section always have a constant relationship.

（発明の目的） 本発明は上記従来の問題点を解消するもので、高周波増
幅部の同調特性を自動的に調整する機能をもったシンセ
サイザーチューナを提供するものである。(Objective of the Invention) The present invention solves the above-mentioned conventional problems and provides a synthesizer tuner having a function of automatically adjusting the tuning characteristics of a high frequency amplification section.

（発明の構成） 本発明は、マイクロコンピュータを用いたシンセサイザ
ーチューナの放送信号強度レベル出力をデジタル信号に
変換するＡ／Ｄ変換器と、マイクロコンピュータのデジ
タル出力を高周波増幅部の選択増幅器のバリキャップ制
御電圧に変換するＤ／Ａ変換器を備えた回路で、ハイク
ロコンピユータで選択増幅器のバリキャップ制御電圧を
徐々に変化させつつ放送信号強度を読み込み、放送信号
強度の最大の点に選択増幅器のバリキャップ制御電圧を
設定するものである。(Structure of the Invention) The present invention includes an A/D converter that converts the broadcast signal strength level output of a synthesizer tuner using a microcomputer into a digital signal, and a varicap of a selective amplifier of a high frequency amplification section that converts the digital output of the microcomputer into a digital signal. This circuit is equipped with a D/A converter that converts it into a control voltage, and uses a high-speed computer to read the broadcast signal strength while gradually changing the varicap control voltage of the selective amplifier. This is to set the cap control voltage.

（実施例の説明） 第１図は本発明の一実施例のブロック回路図である。第
１図におσ）で、■、２．３は従来のシンセサイザーチ
ューナの構成要素で、１は高周波増幅部、２は周波数変
換部、３は中間周波数増幅部、４は放送信号強度レベル
出力、５はＡ／Ｄ変換器、６はマイクロコンピュータ、
７はＤ／Ａ変換器、８はバリキャップ制御電圧である。(Description of Embodiment) FIG. 1 is a block circuit diagram of an embodiment of the present invention. In Figure 1, σ), ■, 2.3 are the components of a conventional synthesizer tuner, 1 is a high frequency amplification section, 2 is a frequency conversion section, 3 is an intermediate frequency amplification section, and 4 is a broadcast signal strength level output. , 5 is an A/D converter, 6 is a microcomputer,
7 is a D/A converter, and 8 is a varicap control voltage.

以下第２図を参照して本発明のシンセサイザーチューナ
の動作を説明する。The operation of the synthesizer tuner of the present invention will be explained below with reference to FIG.

まずバリキャップ制御電圧８を初期値にセットし、Ａ／
Ｄ変換器５を使用して放送信号強度を読み、マイクロコ
ンピュータ６の内部にメモリする。First, set the varicap control voltage 8 to the initial value, and
The broadcast signal strength is read using the D converter 5 and stored in the memory inside the microcomputer 6.

次にバリキャップ制御電圧８を変化させたのちＡ／Ｄ変
換器５を使用して、その時の放送信号強度を読み、マイ
クロコンピュータ６の内部で前回の放送信号強度と比較
してもし前回よりも大きければその値をメモリし、小さ
い場合はその時点で終了させる。これをくり返し放送信
号強度が最大となる点にバリキャップ制御電圧を設定す
る。Next, after changing the varicap control voltage 8, the A/D converter 5 is used to read the broadcast signal strength at that time, and the microcomputer 6 compares it with the previous broadcast signal strength. If the value is larger, it is stored in memory, and if it is smaller, it is terminated at that point. This is repeated to set the varicap control voltage at the point where the broadcast signal strength is maximum.

（発明の効果） 本発明によれば、チューナ自体が高周波増幅部の調整を
するので、これらの調整を製造段階でする必要がなくな
り、製造コストの低減をはかることが可能となる。また
本発明によれば、チューナが受信するたびごとに高周波
増幅部の調整をするので、部品の経年変化や温度変化に
よる同調特性のずれを補正することも期待できる。(Effects of the Invention) According to the present invention, since the tuner itself adjusts the high frequency amplification section, there is no need to make these adjustments at the manufacturing stage, and it is possible to reduce manufacturing costs. Further, according to the present invention, since the high-frequency amplifying section is adjusted every time the tuner receives a signal, it can be expected that deviations in tuning characteristics due to aging of components or temperature changes can be corrected.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例のブロック回路図、第２図は
本発明のシンセサイザーチューナの要部の動作のフロー
チャートを示す図である。 ■　・・・高周波増幅部、　２　・・・周波数変換部、
３・・・中間周波数増幅部、　４　・・・放送信号強度
レベル出力、　５・・・Ａ／Ｄ変換器、６　・・・マイ
クロコンピュータ、７　・・・Ｄ／Ａ変換器、８　・・
・バリキャップ制御電圧。 特許出願人　松下電器産業株式会社 第１図 第２図FIG. 1 is a block circuit diagram of an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of essential parts of the synthesizer tuner of the present invention. ■...High frequency amplification section, 2...Frequency conversion section,
3... Intermediate frequency amplification section, 4... Broadcasting signal strength level output, 5... A/D converter, 6... Microcomputer, 7... D/A converter, 8...
・Varicap control voltage. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] 高周波増幅部の選択増幅器の同調素子を、中間周波信号
強度が最大になるよう可変制御する手段を具したことを
特徴とするＲＦ部自動調整機能を有するシンセサイザー
チューナ。1. A synthesizer tuner having an RF section automatic adjustment function, comprising means for variably controlling a tuning element of a selective amplifier of a high frequency amplification section so that intermediate frequency signal strength is maximized.
JP12020283A 1983-07-04 1983-07-04 Frequency synthesizer tuner having automatic adjusting function of radio frequency part Pending JPS6012828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12020283A JPS6012828A (en) 1983-07-04 1983-07-04 Frequency synthesizer tuner having automatic adjusting function of radio frequency part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12020283A JPS6012828A (en) 1983-07-04 1983-07-04 Frequency synthesizer tuner having automatic adjusting function of radio frequency part

Publications (1)

Publication Number Publication Date
JPS6012828A true JPS6012828A (en) 1985-01-23

Family

ID=14780427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12020283A Pending JPS6012828A (en) 1983-07-04 1983-07-04 Frequency synthesizer tuner having automatic adjusting function of radio frequency part

Country Status (1)

Country Link
JP (1) JPS6012828A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04150421A (en) * 1990-10-12 1992-05-22 Nec Corp Selective radio call receiver
US5400399A (en) * 1991-04-30 1995-03-21 Kabushiki Kaisha Toshiba Speech communication apparatus equipped with echo canceller
US20110179207A1 (en) * 2010-01-15 2011-07-21 Huawei Technologies Co., Ltd. Variable-frequency bus adapter, adapting method and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04150421A (en) * 1990-10-12 1992-05-22 Nec Corp Selective radio call receiver
US5400399A (en) * 1991-04-30 1995-03-21 Kabushiki Kaisha Toshiba Speech communication apparatus equipped with echo canceller
US20110179207A1 (en) * 2010-01-15 2011-07-21 Huawei Technologies Co., Ltd. Variable-frequency bus adapter, adapting method and system
US8468286B2 (en) * 2010-01-15 2013-06-18 Huawei Technologies Co., Ltd. Variable-frequency bus adapter, adapting method and system

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