JPS5821449B2 - Automatic tuning trigger circuit - Google Patents
Automatic tuning trigger circuitInfo
- Publication number
- JPS5821449B2 JPS5821449B2 JP11014678A JP11014678A JPS5821449B2 JP S5821449 B2 JPS5821449 B2 JP S5821449B2 JP 11014678 A JP11014678 A JP 11014678A JP 11014678 A JP11014678 A JP 11014678A JP S5821449 B2 JPS5821449 B2 JP S5821449B2
- Authority
- JP
- Japan
- Prior art keywords
- trigger circuit
- automatic tuning
- khz
- frequency
- amplifier
- 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.)
- Expired
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
- H03J7/18—Automatic scanning over a band of frequencies
- H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
【発明の詳細な説明】
本発明は自動選局トリガー回路に関するものでチャンネ
ルセパレーションが所定値の１／２であっても正常なト
リガー信号が得られるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic channel selection trigger circuit that is capable of obtaining a normal trigger signal even if the channel separation is 1/2 of a predetermined value.
たとえばＰＬＬシンセサイザ一方式電子同調ラジオのＦ
Ｍヨーロッパバンドのチャンネルセパレーションを５０
ＫＨ２とした場合、第１図に示した周波数の局の放送だ
けが受信可能である。For example, the F of a PLL synthesizer one-way electronic tuning radio.
M European band channel separation 50
In the case of KH2, only broadcasts from stations with the frequencies shown in FIG. 1 can be received.
ところが８９．１７５ＭＨｚ 、 １０１．１２５ＭＨ
ｚというように２５ＫＨｚ間隔で受信周波数の切りかえ
を行なわないと同調できないというような周波数の局が
あった場合、これらの特定の局のために周波数の切換え
間隔を２５ ＫＩ−（ｚとすると、切換えチャンネル数
がふえ、選局に時間がかかるとともに分周比が大きくな
りメモリ数をふやさなければならない等の欠点がある。However, 89.175MHz, 101.125MHz
If there is a station with a frequency such as z that cannot be tuned to without switching the receiving frequency at 25 kHz intervals, set the frequency switching interval to 25 kHz for these specific stations. There are disadvantages such as the increase in the number of channels, the time required for channel selection, the increase in the frequency division ratio, and the need to increase the number of memories.
一方チャンネルセパレーションを５０ＫＨｚにとってあ
った場合、２５ＫＨｚ離調した局は自動選局してもトリ
ガー出力が出ず掃引を停止することができない。On the other hand, if the channel separation is set to 50 KHz, a station that is detuned by 25 KHz will not generate a trigger output even if it is automatically tuned, making it impossible to stop the sweep.
ｉ 本発明はこのような問題点を解決せんとするもので
ある。i The present invention aims to solve these problems.
本発明はトリが一回路のＩＰ選択回路の中心周波数をＩ
Ｆの周波数（ＦＭのＰＬＬシンセサイザ一方式であれば
たとえば１０．７０ＭＨｚ ）よりも１２．５ ＫＨｚ
いずれかの方向にずらすようにしたものである。In the present invention, the center frequency of the IP selection circuit of one circuit is
12.5 KHz than the frequency of F (for example, 10.70 MHz for one type of FM PLL synthesizer)
It is designed to be shifted in either direction.
以下、本発明の動作を第２図を用いて説明する。The operation of the present invention will be explained below with reference to FIG.
まず、受信機系のＩＦ帯域はこのトリガー回路のＩＦ帯
域に比べて十分太きいとする。First, it is assumed that the IF band of the receiver system is sufficiently wider than the IF band of this trigger circuit.
また放送波の平均エネルギーは受信周波数に集中してい
るものとする。It is also assumed that the average energy of broadcast waves is concentrated at the receiving frequency.
また、掃引ストップトリガーはこの平均エネルギーに対
応して出力されるものとする。Further, it is assumed that the sweep stop trigger is output in accordance with this average energy.
第２図において、破線が従来のトリガー回路の選択特性
である。In FIG. 2, the broken line represents the selection characteristics of the conventional trigger circuit.
これによると２５ＫＨｚ離調すればレベルはかなり減衰
して検出されない。According to this, if the signal is detuned by 25 KHz, the level will be significantly attenuated and will not be detected.
ところが実線のとと＜１２．５ＫＨｚすらした選択特性
にするさ、１０．７ ＭＨｚに対しても＋２５ＫＨｚ離
調した局に対しても減衰量はＡだけとなり、１０、７
ＭＨｚのＩＦ周波数の得られる局に対しても、２５ＫＨ
ｚ離調した局に対してもその放送波の受信レベルを検出
することができる。However, if we set the selection characteristic to <12.5KHz compared to the solid line, the attenuation amount will be only A for both 10.7 MHz and +25KHz detuned stations, and 10,7
Even for stations that can obtain an IF frequency of MHz, 25KH
Even for a station that is out of tune by z, the reception level of the broadcast wave can be detected.
したがって５０ＫＨｚの整数倍の局は従来通り自動選局
でき、また２５ＫＨｚずれた局に対しても−２５ＩＧ（
ｚの受信周波数にて自動選局できることになる。Therefore, stations with an integer multiple of 50KHz can be automatically tuned as before, and -25IG (
This means that automatic tuning can be performed using the reception frequency of z.
第３図はその一回路側を示すもので、■Ｆアンプ１１の
出力（たとえば１０．７ＭＨｚ ）をトリガー増巾器１
２に加える一方、増巾器１２に基準信号源１３からの出
力（１１，５２ＭＨｚ ）を加えてミキサ１２１でミキ
シングし、８２０ＫＨｚに信号変換し、同調周波数を１
２．５ＫＨｚずらした増巾部１２２で増巾し、それを検
波器１４で検波しトリガー出力を得るようにしている。Figure 3 shows one of the circuits, where the output of the F amplifier 11 (for example, 10.7 MHz) is connected to the trigger amplifier 1.
2, the output from the reference signal source 13 (11.52 MHz) is added to the amplifier 12 and mixed by the mixer 121, the signal is converted to 820 kHz, and the tuning frequency is set to 1.
The signal is amplified by an amplifying section 122 shifted by 2.5 KHz, and detected by a detector 14 to obtain a trigger output.
以上のように本発明によればＰＬＬシンセサイザーの受
信周波数は５０ ＫＨｚ間隔のま＼で２５ＫＨｚの奇数
倍の周波数の局に対しても自動選局することができ、２
５ＫＨｚの奇数倍の放送周波数をもつ地方向けのラジオ
受信機にきわめて有用である。As described above, according to the present invention, the receiving frequency of the PLL synthesizer can be automatically tuned to stations with frequencies that are odd multiples of 25 KHz at intervals of 50 KHz.
It is extremely useful for rural radio receivers with broadcast frequencies that are odd multiples of 5KHz.
第１図は放送局の送信周波数の配列を示す図、第２図は
本発明のトリガー回路における選択増巾器の帯域特性を
示す図、第３図は本発明の一実施例における自動選局ト
リガー回路のブロック図である。
１１・・・・・・ＩＰアンプ、１２・・・・・・トリガ
ー増巾器、１２１・・・・・・ミキサ、１３・・・・・
・基準信号源、１２２・・・・・・増巾部、１４・・・
・・・検波器。Fig. 1 is a diagram showing the arrangement of transmission frequencies of broadcasting stations, Fig. 2 is a diagram showing the band characteristics of the selective amplifier in the trigger circuit of the present invention, and Fig. 3 is a diagram showing the automatic tuning in an embodiment of the present invention. FIG. 3 is a block diagram of a trigger circuit. 11...IP amplifier, 12...Trigger amplifier, 121...Mixer, 13...
・Reference signal source, 122... Amplifying section, 14...
...Detector.
Claims (1)
巾器を備え、上記増巾器の増巾帯域の中心周波数をシン
セサイザーで設定した受信周波数に対応した中心周波数
からずらしたことを特徴とする自動選局トリガー回路。I is characterized in that it is equipped with an amplifier that selects a narrow band for IF specific output and uses it as a trigger output, and that the center frequency of the amplification band of the amplifier is shifted from the center frequency that corresponds to the reception frequency set by the synthesizer. Automatic tuning trigger circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11014678A JPS5821449B2 (en) | 1978-09-06 | 1978-09-06 | Automatic tuning trigger circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11014678A JPS5821449B2 (en) | 1978-09-06 | 1978-09-06 | Automatic tuning trigger circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5537049A JPS5537049A (en) | 1980-03-14 |
| JPS5821449B2 true JPS5821449B2 (en) | 1983-04-30 |
Family
ID=14528202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11014678A Expired JPS5821449B2 (en) | 1978-09-06 | 1978-09-06 | Automatic tuning trigger circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5821449B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054124A (en) * | 1983-09-02 | 1985-03-28 | 株式会社日立製作所 | Vacuum breaker |
-
1978
- 1978-09-06 JP JP11014678A patent/JPS5821449B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5537049A (en) | 1980-03-14 |
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