JPH0232816B2 - JUSHINKAIRO - Google Patents
JUSHINKAIROInfo
- Publication number
- JPH0232816B2 JPH0232816B2 JP21055683A JP21055683A JPH0232816B2 JP H0232816 B2 JPH0232816 B2 JP H0232816B2 JP 21055683 A JP21055683 A JP 21055683A JP 21055683 A JP21055683 A JP 21055683A JP H0232816 B2 JPH0232816 B2 JP H0232816B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- intermediate frequency
- circuit
- desired frequency
- output
- 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 - Lifetime
Links
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は受信回路に係わり、特に複数の受信信
号をモニタできる受信回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a receiving circuit, and particularly to a receiving circuit capable of monitoring a plurality of received signals.
従来、無線通信機を運用する際に複数の受信信
号を聴守し、必要に応じて複数の受信信号の１つ
を取出す場合がある。通常、このような運用（以
下多信号モニタと云う）は複数台の受信機を用意
して、その都度、AFゲインコントロールを操作
し、又はスピーカへの出力をオン・オフして希望
する信号を選択的にモニタ受信していた。また、
これらの受信機とは別に従来技術の中にバンドパ
スフイルタの通過周波数帯を変更する方式があ
る。その一つは周波数帯域が一定でバンドパスフ
イルタに入力する混合段で、局部発振器の周波数
を可変して入力し、バンドパスフイルタ内の通過
する周波数を可変する方法や、第２図に示すよう
に特公昭40−1531号公報にようなバンドパスフイ
ルタの通過帯域を可変する方法が知られている。
第２図について概略説明すると、図中１１はコイ
ル、１２，１３はコンデンサ、１４ａ，１４ｂは
容量ダイオードであるこの同調回路に端子１５か
ら周波数調整の制御電圧を加え、その電圧を可変
し容量ダイオード、の容量を変えることによつて
同調周波数が変更できるものである。
BACKGROUND ART Conventionally, when operating a wireless communication device, a plurality of received signals are listened to, and one of the plurality of received signals is extracted as necessary. Normally, for this kind of operation (hereinafter referred to as multi-signal monitor), multiple receivers are prepared and the desired signal is obtained by operating the AF gain control or turning on/off the output to the speaker each time. Selective monitor reception. Also,
In addition to these receivers, there is a method in the prior art that changes the pass frequency band of a bandpass filter. One is a mixing stage in which the frequency band is constant and is input to a bandpass filter, and the frequency of the local oscillator is varied and input, and the frequency passing through the bandpass filter is varied. A method of varying the passband of a bandpass filter is known, as disclosed in Japanese Patent Publication No. 1531/1973.
To briefly explain Fig. 2, in the figure 11 is a coil, 12 and 13 are capacitors, and 14a and 14b are capacitance diodes.A control voltage for frequency adjustment is applied from a terminal 15 to this tuning circuit, and the voltage is varied, and the capacitance diodes are connected to each other. By changing the capacitance of , the tuning frequency can be changed.
前述のような従来技術における多信号モニタで
は、複数台の受信機を準備しなければならないの
で受信機の配置空間の増加、あるいは操作性の低
下等の不都合が生じていた。本発明はこのような
問題点を解決し、一台の受信機で受信中以外に
も、近接するチヤンネルの周波数をモニタできる
受信機の提供を目的とする。
In the conventional multi-signal monitor as described above, it is necessary to prepare a plurality of receivers, resulting in disadvantages such as an increase in the space for installing the receivers and a decrease in operability. SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a receiver that can monitor frequencies of adjacent channels in addition to when a single receiver is receiving signals.
スーパーヘテロダイン受信機の混合器出力側か
ら受信回路の第１の中間周波回路と並設して設け
た、周波数帯域を可変できる第２の中間周波数回
路と信号レベルを可変する手段を有する増幅回路
から成るモニター選択回路を設けて、その出力を
受信機のスピーカ段に入力し、通常の受信信号と
近接する周波数を第２の中間周波数を介して出力
し、モニタできる構成である。
From the output side of the mixer of the superheterodyne receiver, a second intermediate frequency circuit that is provided in parallel with the first intermediate frequency circuit of the receiving circuit and that can vary the frequency band, and an amplifier circuit that has means for varying the signal level. A monitor selection circuit is provided, the output of which is input to the speaker stage of the receiver, and a frequency close to the normal received signal is outputted via a second intermediate frequency for monitoring.
本発明の実施例を図面にもとずいて説明する
と、第１図において、アンテナ１、RFユニツト
２及び混合器３は前段の受信回路を構成し、複数
の受信信号はアンテナ１、RFユニツト２を経由
して混合器３へ入力される。そして、該混合器３
は選択されたローカル信号fLをローカル側端子へ
受け、複数の受信信号を中間周波数に変換して、
後段の第１、第２の受信回路へ出力する。又、上
記後段の受信回路は、中間周波回路４とその音声
回路、および中間周波回路４′とその音声回路で
構成されている。
An embodiment of the present invention will be described based on the drawings. In FIG. 1, an antenna 1, an RF unit 2, and a mixer 3 constitute a receiving circuit at the front stage, and a plurality of received signals are transmitted to the antenna 1, the RF unit 2, and the mixer 3. is input to the mixer 3 via. And the mixer 3
receives the selected local signal f L to the local side terminal, converts the multiple received signals to an intermediate frequency, and
It is output to the first and second receiving circuits at the subsequent stage. The receiving circuit at the latter stage is composed of the intermediate frequency circuit 4 and its audio circuit, and the intermediate frequency circuit 4' and its audio circuit.
第２の中間周波回路４′には中間周波変更手段
として、電圧制御周波数帯域可変形のバンドパス
フイルタ８が設けてある。このバンドパスフイル
タ８は演算増幅器で形成されており、周波数調整
用のボリウム９によつて制御電圧を変えることに
より通過帯域の中心用波数が変化する。 The second intermediate frequency circuit 4' is provided with a voltage controlled frequency band variable band pass filter 8 as intermediate frequency changing means. This bandpass filter 8 is formed of an operational amplifier, and by changing the control voltage using a frequency adjusting volume 9, the wave number for the center of the passband is changed.
一方の希望信号は選択されたローカル信号fLに
応じた一方の中間周波に変換される。第１の中間
周波回路４の中間周波数が一方の中間周波の中間
周波数と一致しているときは一方の希望信号は後
段の第１の受信回路を経由して音声信号となる。
他方の希望信号は選択されたローカル信号fLに応
じた他方の中間周波に変換される。周波数調整用
ボリユーム９を操作し電圧制御バンドパスフイル
タ８の中心周波数を変化させ第２の中間周波回路
４′の中間周波数を他方の中間周波の中間周波数
と一致させると他方の希望信号は後段の第２の受
信回路を経由して音声信号となる。 One desired signal is converted to one intermediate frequency according to the selected local signal f L . When the intermediate frequency of the first intermediate frequency circuit 4 matches the intermediate frequency of one of the intermediate frequencies, one desired signal becomes an audio signal via the first receiving circuit at the subsequent stage.
The other desired signal is converted to the other intermediate frequency according to the selected local signal f L . When the frequency adjustment volume 9 is operated to change the center frequency of the voltage-controlled bandpass filter 8 and the intermediate frequency of the second intermediate frequency circuit 4' is made to match the intermediate frequency of the other intermediate frequency, the other desired signal is It becomes an audio signal via the second receiving circuit.
上記受信回路で例えば第１の中間周波回路の中
間周波数を8.215MHzとし、ローカル信号fLを調
整して37.715MHzにすると29.5MHzの一方の希望
電波は中間周波回路４、増幅器５を介してスピー
カ７から音声信号として出力される。周波数調整
用ボリユームを操作し第２の中間周波回路４′の
中間周波数を8.815MHzに調整すると28.9MHzの
他方の希望電波は中間周波回路４′、増幅器５′を
介してスピーカ７から音声信号として出力され
る。 In the above receiving circuit, for example, if the intermediate frequency of the first intermediate frequency circuit is 8.215 MHz and the local signal f L is adjusted to 37.715 MHz, one desired radio wave of 29.5 MHz is sent to the speaker via the intermediate frequency circuit 4 and the amplifier 5. 7 is output as an audio signal. When the frequency adjustment volume is adjusted to adjust the intermediate frequency of the second intermediate frequency circuit 4' to 8.815MHz, the other desired radio wave of 28.9MHz is output from the speaker 7 as an audio signal via the intermediate frequency circuit 4' and the amplifier 5'. Output.
一方の音量調整用ボリユーム６を操作し29.5M
Hzの一方の希望電波に係わる音声信号を減衰さ
せ、または遮断すると28.9MHzの他方の希望電波
に係わる音声信号がモニタできる。 Operate volume 6 on one side to adjust the volume to 29.5M.
By attenuating or blocking the audio signal associated with one desired radio wave at 28.9 MHz, the audio signal associated with the other desired radio wave at 28.9 MHz can be monitored.
上記実施例では中間周波数変換手段に電圧制御
バンドパスフイルタを用い周波数調整用ボリユー
ムで電圧制御バンドパスフイルタをアナログ的に
制御したがこれに限定されず、CCDを用いたバ
ンドパスフイルタを設け、CCDを制御するクロ
ツクパルスの周波数を可変とするデジタル的制御
を用いてもよい。また、混合器を設け混合器のロ
ーカル信号を変化させるようにしてもよい。 In the above embodiment, a voltage-controlled band-pass filter is used as the intermediate frequency conversion means, and the voltage-controlled band-pass filter is controlled in an analog manner by the frequency adjustment volume, but the present invention is not limited to this. Digital control may be used in which the frequency of the clock pulses controlling the clock pulses is varied. Alternatively, a mixer may be provided and the local signal of the mixer may be changed.
本発明になる受信回路は単一の混合器から出力
される中間周波を入力される複数の中間周波回路
と、中間周波回路の中間周波数を変更する中間周
波変更手段とを具備した構成としてあるため中間
周波回路の中間周波数を変更できる特長を有して
いる。このため一方の希望電波の近傍に他の希望
電波と一致するか否かを検索でき、検索した他の
希望電波と一方の希望電波とを同時に傍受できる
効果がある。また、この場合、複数の受信機を設
置する必要がなく、操作性の向上、設計場所に係
わるスペースフアクタの改善が期限できる。
The receiving circuit according to the present invention has a configuration including a plurality of intermediate frequency circuits into which the intermediate frequency output from a single mixer is input, and intermediate frequency changing means for changing the intermediate frequency of the intermediate frequency circuit. It has the feature of being able to change the intermediate frequency of the intermediate frequency circuit. Therefore, it is possible to search for a match with another desired radio wave in the vicinity of one desired radio wave, and there is an effect that the searched other desired radio wave and one desired radio wave can be intercepted at the same time. Moreover, in this case, there is no need to install multiple receivers, and it is possible to improve the operability and the space factor related to the design location.
第１図は本発明の一実施例を示すブロツク図
で、第２図は従来技術の電圧制御の同調周波数可
変フイルタの回路図である。
１……アンテナ、２……RFユニツト、３……
混合器、４，４′……中間周波数回路、５，５′…
…増幅器、６，６′……音声調整用ボリユーム、
７……スピーカ、８……電圧制御周波数帯域可変
用バンドパスフイルタ、９……周波数調整用ボリ
ユーム、１１……コイル、１２，１３……コンデ
ンサ、１４ａ，１４ｂ……可変容量ダイオード、
１５……制御用電源端子。
FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram of a voltage-controlled tuned frequency variable filter of the prior art. 1...Antenna, 2...RF unit, 3...
Mixer, 4, 4'...Intermediate frequency circuit, 5, 5'...
...Amplifier, 6,6'...Volume for audio adjustment,
7...Speaker, 8...Bandpass filter for variable voltage control frequency band, 9...Volume for frequency adjustment, 11...Coil, 12, 13...Capacitor, 14a, 14b...Variable capacitance diode,
15... Control power supply terminal.
Claims (1)
の出力側に受信用回路とモニタ用回路とを並設
し、一つのスピーカで復調音を出力するよう構成
し、前記モニタ用回路の中間周波回路は電圧制御
の周波数帯域可変バンドパスフイルタを用い、所
望周波数を設定する局部発振器の周波数によつ
て、混合器から所望周波数の中間周波数と所望周
波数の近傍の周波数による他の中間周波数を発生
させ、所望の周波数は前記受信用回路から出力
し、前記の他の中間周波数は前記モニタ回路の電
圧制御周波数帯域加変バンドパスフイルタを調整
して、前記他の中間周波数の中心周波数と整合さ
せて出力し、所望の周波数か、モニタ出力信号か
を選択出力させて所望周波数の受信及び所望周波
数の近傍の電波をモニタすることを特徴とする受
信回路。1. In a superheterodyne receiver, a receiving circuit and a monitoring circuit are arranged in parallel on the output side of a mixer, and a single speaker is configured to output demodulated sound, and the intermediate frequency circuit of the monitoring circuit is voltage controlled. Using a variable frequency band pass filter, the mixer generates an intermediate frequency of the desired frequency and another intermediate frequency of frequencies near the desired frequency, depending on the frequency of the local oscillator that sets the desired frequency, and then generates the desired frequency. is output from the receiving circuit, and the other intermediate frequency is outputted by adjusting the voltage controlled frequency band variable bandpass filter of the monitor circuit to match the center frequency of the other intermediate frequency, and outputting the desired frequency. What is claimed is: 1. A receiving circuit that selectively outputs either a frequency or a monitor output signal to receive a desired frequency and monitor radio waves in the vicinity of the desired frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21055683A JPH0232816B2 (en) | 1983-11-09 | 1983-11-09 | JUSHINKAIRO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21055683A JPH0232816B2 (en) | 1983-11-09 | 1983-11-09 | JUSHINKAIRO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60103741A JPS60103741A (en) | 1985-06-08 |
| JPH0232816B2 true JPH0232816B2 (en) | 1990-07-24 |
Family
ID=16591273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21055683A Expired - Lifetime JPH0232816B2 (en) | 1983-11-09 | 1983-11-09 | JUSHINKAIRO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0232816B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04136214U (en) * | 1991-06-07 | 1992-12-18 | 倉三郎 水野 | Affected area cooling device |
-
1983
- 1983-11-09 JP JP21055683A patent/JPH0232816B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04136214U (en) * | 1991-06-07 | 1992-12-18 | 倉三郎 水野 | Affected area cooling device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60103741A (en) | 1985-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |