JPS5885623A - Tuning method of amplitude modulation receiver - Google Patents

Tuning method of amplitude modulation receiver

Info

Publication number
JPS5885623A
JPS5885623A JP18362981A JP18362981A JPS5885623A JP S5885623 A JPS5885623 A JP S5885623A JP 18362981 A JP18362981 A JP 18362981A JP 18362981 A JP18362981 A JP 18362981A JP S5885623 A JPS5885623 A JP S5885623A
Authority
JP
Japan
Prior art keywords
9nkhz
sample
2khz
electric field
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
JP18362981A
Other languages
Japanese (ja)
Inventor
Iwao Mori
森　岩雄
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP18362981A priority Critical patent/JPS5885623A/en
Priority to DE19823242430 priority patent/DE3242430A1/en
Priority to FR8219212A priority patent/FR2516721B1/en
Priority to GB08232883A priority patent/GB2111335B/en
Publication of JPS5885623A publication Critical patent/JPS5885623A/en
Pending 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
    • 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
    • H03J7/06—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 counters or frequency dividers
    • H03J7/065—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 counters or frequency dividers the counter or frequency divider being used in a phase locked loop
    • 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
    • H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
    • H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies

Abstract

PURPOSE:To eliminate troublesomeness for switching and deterioration of characteristics, by providing an automatic circuit which is capable of receiving a broadcast of a broadcasting station whose channel has been selected by a channel plan of 9nKHz, in an AM receiver which is automatically tuned by a 9n+ 2KHz step. CONSTITUTION:When a microprocessor 9 has scanned at a frequency interval of 9n+2KHz, and has stopped scanning by detecting electric field intensity exceeding a prescried level, a receiving instruction of 9nKHz is generated continuously. By this receiving instruction of 9nKHz, an FET12 becomes an on-state, and an electric field intensity signal is sample-held. Output of a sample-holding circuit A consisting of an FET10 and a capacitor 11, and a sample-holding circuit B consisting of the FET12 and a capacitor 13 are compared by a level comparator 14, an output of the level comparator 14 is waveform-shaped 15, is outputted to the microprocessor 9, and a larger one of the outputs of the sample-holding circuit A and B, that is to say, that which has larger electric field intensity is selected. In this way, 9n+2KHz and 9nKHz are switched automatically.

Description

【発明の詳細な説明】 本発明はＡＭ受信機の同調方法に関し、さらに評言すれ
ばＬＷ波チャンネルプランに従って９０＋２ＫＨｚで自
動同調するＡＭ受信機の同調方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for tuning an AM receiver, and more particularly to a method for tuning an AM receiver that automatically tunes at 90+2 KHz according to an LW wave channel plan.

ＡＭ受信機において９ｎ＋２ＫＨｚのステップで自動同
調する受信機がある。かかる受信機において、チャンネ
ルプラン９ｎＫＨｚ間隔に変更された場合、９ｎ＋２Ｋ
Ｈｚと９ｎＫＨｚの切換スイッチを設け、放送局により
切換えて受信することが考えられるが、−々切換えを行
なうのはきわめてわずられしい。There is an AM receiver that automatically tunes in steps of 9n+2KHz. In such a receiver, if the channel plan is changed to 9nKHz spacing, then 9n+2K
It is conceivable to provide a changeover switch for Hz and 9nKHz and to switch between them depending on the broadcasting station, but it would be extremely troublesome to switch between the two.

また、９ｎ＋２Ｋｔｌｚステツプのまま受信すれば、受
信周波数が２ＫＨｚずれてしまって、特性が劣化する。Furthermore, if the signal is received in 9n+2Ktlz steps, the reception frequency will be shifted by 2KHz and the characteristics will deteriorate.

さらにまた、手動にてＩＫＨｚステップ走査とすること
も考えられるが現実的ではない。Furthermore, it is conceivable to perform IKHz step scanning manually, but this is not practical.

本発明は上記にかんがみなされたもので、９ｎ＋２ＫＨ
ｚステツプで自動同調を行なうＡＭ受信機において、９
ｎＫＨｚのチャンネルプランで選局された放送局の放送
を受信できる自動回路を設けることにより、上記欠点お
よび問題点を解消したＡＭ受信機の同調方法を提供する
ことを目的とする。The present invention is considered in view of the above, and includes 9n+2KH
In an AM receiver that automatically tunes with the z step, 9
It is an object of the present invention to provide a tuning method for an AM receiver that eliminates the above drawbacks and problems by providing an automatic circuit that can receive broadcasts from broadcast stations selected according to an nKHz channel plan.

以下、本発明を実施例により説明する。The present invention will be explained below using examples.

図は本発明方法を適用した一実施例のブロック図である
。The figure is a block diagram of an embodiment to which the method of the present invention is applied.

１は高周波増幅および混合回路を、２は中間周波増幅回
路を、３は検波回路を、４は音声信号増幅器を、５はス
ピーカを、６は局部発振器を、７は局部発振１１６に出
力するＰＬＬ回路を、８は高周波増幅回路から検出した
受信電界強度を表示す　−るシグナルメータであり、Ｐ
ＬＬ回路７にマイクロプロセサ９からの周波数データに
より周波数選択を行ないＡＭ放送を受信するＡＭ受信機
を構成している。1 is a high frequency amplification and mixing circuit, 2 is an intermediate frequency amplification circuit, 3 is a detection circuit, 4 is an audio signal amplifier, 5 is a speaker, 6 is a local oscillator, and 7 is a PLL that outputs to the local oscillator 116. 8 is a signal meter that displays the received electric field strength detected from the high frequency amplification circuit;
The LL circuit 7 selects a frequency based on the frequency data from the microprocessor 9 to constitute an AM receiver that receives AM broadcasting.

一方、シグナルメータ８へ出力される検出電界強度信号
はマイクロプロセサ９にも入力されて、ＰＬＬ回路７へ
入力される周波数データを維持し、放送受信周波数の自
動走査が一旦停止される。On the other hand, the detected electric field strength signal outputted to the signal meter 8 is also inputted to the microprocessor 9 to maintain the frequency data inputted to the PLL circuit 7, and the automatic scanning of the broadcast reception frequency is temporarily stopped.

一方、上記した検出電界強度信号は電界効果トランジス
タ（以下、ＦＥＴと記す）１０とコンデンサ１１とから
なるサンプルホールド回路Ａに印加する。ＦＥＴ１０は
マイクロプロセサ９により９ｎ＋２ＫＨｚの周波数間隔
で自動走査中、所定レベル以上の電界強度が検出された
ときサンプリング信号によりオン状態となる。また検出
電界強度信号はＦＥＴ１２およびコンデンサ１３からな
るマイクロプロセサ９が前記した９　ｎ　＋２　Ｋ　ｌ
（ｚの周波数間隔で走査したときに所定レベル以上の電
界強度を検出して走査を停止したときに引続いて９ｎ　
ＫＨｚ　（９ｎ　＋　２　ＫＨｚ　−２ＫＨｚ）の受信
命令を発生する。この９ｎＫＨｚの受信命令によりＦＥ
Ｔ１２をオン状態にして電界強度信号をサンプルホール
ドする。なお１９はＦＥＴｑＡ勤回路である。On the other hand, the above-mentioned detected field strength signal is applied to a sample-and-hold circuit A consisting of a field effect transistor (hereinafter referred to as FET) 10 and a capacitor 11. The FET 10 is turned on by a sampling signal when an electric field strength of a predetermined level or higher is detected during automatic scanning by the microprocessor 9 at a frequency interval of 9n+2 KHz. Further, the detected electric field strength signal is generated by the microprocessor 9 consisting of the FET 12 and the capacitor 13.
(When scanning at a frequency interval of z, when an electric field strength of a predetermined level or higher is detected and scanning is stopped, 9n
Generates a reception command of KHz (9n + 2 KHz - 2KHz). This 9nKHz reception command causes the FE to
T12 is turned on to sample and hold the electric field strength signal. Note that 19 is a FETqA circuit.

サンプルホールド回路ＡおよびＢの出力はレベル比較１
１１４により比較し、レベル比較器１４の出力を波形整
形回路１５で波形整形してマイクロプロセサ９に出力し
、サンプルホールド回路ＡとＢの出力の大きい方、すな
わち電界強度信号の大きい方を選択する。一方、波形整
形回路１５の出力は表示器駆動回路１６を介して発光ダ
イオード１７および１８を選択して発光させる。The outputs of sample and hold circuits A and B are level compared 1.
114, the output of the level comparator 14 is shaped into a waveform by the waveform shaping circuit 15, and outputted to the microprocessor 9, and the larger output of the sample and hold circuits A and B, that is, the one with the larger field strength signal is selected. . On the other hand, the output of the waveform shaping circuit 15 is sent to the display drive circuit 16 to select the light emitting diodes 17 and 18 to cause them to emit light.

以上の如く構成することにより、９ｎ＋２ＫＨｚ間隔に
おける受ｇＩＷ４波数走査時において、受信と同時に９
ｎ＋２ＫＨｚ−２ＫＨｚの受信周波数における電界強度
信号の検出が行なわれる。By configuring as described above, when receiving gIW4 wave number scanning at 9n+2KHz intervals, 9n
Detection of the field strength signal at a reception frequency of n+2 KHz-2 KHz is performed.

９ｎ＋２ＫＨｚ間隔における受信時の電界強度信号と９
ｎ＋２ＫＨｚ　　２ＫＨｚの受信周波数における電界信
号との比較が行なわれ、前者の強度が大のときは再び９
ｎ＋２ＫＨｚの受信に戻し、後者の強度が大きいときは
９ｎ＋２ＫＨｚ−２ＫＨｚの受信周波数で受信すること
になる。Field strength signal during reception at 9n+2KHz interval and 9
A comparison is made with the electric field signal at the reception frequency of n+2KHz 2KHz, and when the strength of the former is large, it is again 9
The reception frequency is returned to n+2KHz, and when the latter intensity is large, reception is performed at a reception frequency of 9n+2KHz-2KHz.

以上説明した如く本発明によれば、９ｎ＋２Ｋ）１ｚの
周波数間隔で受信周波数を走査し自動同調するＡＭ受信
機においても９ｎ＋２Ｋｌ（ｚと９ｎＫＨｚとが自動的
に切換わることになる。As explained above, according to the present invention, even in an AM receiver that automatically tunes by scanning reception frequencies at frequency intervals of 9n+2K)1z, 9n+2Kl(z and 9nKHz are automatically switched).

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

図は本発明方法を適用した一実施例におけるプロンク図
である。 ｌ・・・高周波増幅および混合回路、２・・・中間周波
増幅回路、３・・・検波回路、４・・・音声信号増幅器
、６・・・局部発振器、７・・・ＰＬＬ回路、９・・・
マイクロプロセサ、ｌＯおよび１２・・・ＦＥＴ、１１
および１３・・・ホールド用のコンデンサ、１４・・・
レベル比較器、１５・・・波形整形回路The figure is a Pronk diagram in one embodiment to which the method of the present invention is applied. l... High frequency amplification and mixing circuit, 2... Intermediate frequency amplification circuit, 3... Detection circuit, 4... Audio signal amplifier, 6... Local oscillator, 7... PLL circuit, 9...・・・
Microprocessor, lO and 12...FET, 11
and 13... hold capacitor, 14...
Level comparator, 15... waveform shaping circuit

Claims (1)

【特許請求の範囲】[Claims] チャンネルプランに従ってｋ　ｎ　＋　ＩＩＫ　Ｈｚ　
（ｋ　ｓｌは定数）間隔で自動同調するＡＭ受信機にお
いて、ｋｎ＋１ＫＨ１の周波数における受信と同時に（
ｋｎ＋ｊＫＨｚ）−１ＫＨｚにおける電界強度信号レベ
ルを検出して（ｋｎ＋ｊＫｌ（ｚ）における電界強度信
号レベルを検出して（ｋｎ＋１ｔＫｌ（ｚ）における電
界強度信号レベルとの比較を行ない、何れか高い方に同
調させることを特徴とするＡＭ受信機の同調方法。k n + IIK Hz according to channel plan
In an AM receiver that automatically tunes at intervals (k sl is a constant), at the same time as reception at the frequency kn+1KH1 (
Detect the field strength signal level at (kn+jKHz)-1KHz, detect the field strength signal level at (kn+jKl(z)), compare it with the field strength signal level at (kn+1tKl(z)), and tune to whichever is higher. A method of tuning an AM receiver characterized by the following.
JP18362981A 1981-11-18 1981-11-18 Tuning method of amplitude modulation receiver Pending JPS5885623A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP18362981A JPS5885623A (en) 1981-11-18 1981-11-18 Tuning method of amplitude modulation receiver
DE19823242430 DE3242430A1 (en) 1981-11-18 1982-11-16 METHOD AND DEVICE FOR TUNING AN AM RECEIVER
FR8219212A FR2516721B1 (en) 1981-11-18 1982-11-17 METHOD FOR AUTOMATICALLY TUNING AN AMPLITUDE MODULATED RADIO RECEIVER AND RADIO RECEIVER INCLUDING APPLICATION OF THIS METHOD
GB08232883A GB2111335B (en) 1981-11-18 1982-11-18 A method of tuning an am receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18362981A JPS5885623A (en) 1981-11-18 1981-11-18 Tuning method of amplitude modulation receiver

Publications (1)

Publication Number Publication Date
JPS5885623A true JPS5885623A (en) 1983-05-23

Family

ID=16139108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18362981A Pending JPS5885623A (en) 1981-11-18 1981-11-18 Tuning method of amplitude modulation receiver

Country Status (4)

Country Link
JP (1) JPS5885623A (en)
DE (1) DE3242430A1 (en)
FR (1) FR2516721B1 (en)
GB (1) GB2111335B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08265106A (en) * 1995-03-20 1996-10-11 Fujitsu Ten Ltd Electronic tuning radio
WO2017077593A1 (en) * 2015-11-04 2017-05-11 三菱電機株式会社 Broadcast receiver

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3347132C1 (en) * 1983-12-27 1985-07-04 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Automatic adjustment system for a tuner of a television receiver
US5448763A (en) * 1993-11-09 1995-09-05 Motorola Apparatus and method for operating a phase locked loop frequency synthesizer responsive to radio frequency channel spacing
DE4422908C1 (en) 1994-06-30 1995-11-02 Grundig Emv Automatically identifying oscillator frequency for satellite receiver frequency converter
WO2001048909A2 (en) * 1999-12-23 2001-07-05 Koninklijke Philips Electronics N.V. Quadrature frequency converter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983492A (en) * 1975-01-29 1976-09-28 Bell Telephone Laboratories, Incorporated Frequency scan and lock circuit for mobile radio channel selection
US4069455A (en) * 1976-11-11 1978-01-17 General Electric Company Arrangement for maintaining reception of a radio receiver on the stronger of two signals
AU4646579A (en) * 1978-05-19 1979-11-22 Walter George Cox Frequency selector tuning means
US4214274A (en) * 1978-06-19 1980-07-22 Matsushita Electric Corporation Frequency synthesizer tuning system with variable dwell signal seek
JPS593891B2 (en) * 1979-01-17 1984-01-26 ソニー株式会社 Reception detection circuit
DE2935548C2 (en) * 1979-09-03 1989-07-20 Saba Gmbh, 7730 Villingen-Schwenningen Circuit arrangement for setting a receiver to predetermined transmitter frequencies by means of a tunable oscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08265106A (en) * 1995-03-20 1996-10-11 Fujitsu Ten Ltd Electronic tuning radio
WO2017077593A1 (en) * 2015-11-04 2017-05-11 三菱電機株式会社 Broadcast receiver
JPWO2017077593A1 (en) * 2015-11-04 2017-12-14 三菱電機株式会社 Broadcast receiver

Also Published As

Publication number Publication date
GB2111335A (en) 1983-06-29
GB2111335B (en) 1985-07-03
FR2516721A1 (en) 1983-05-20
DE3242430A1 (en) 1983-05-26
FR2516721B1 (en) 1986-02-21

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