JPS6142454B2 - - Google Patents
Info
- Publication number
- JPS6142454B2 JPS6142454B2 JP9679679A JP9679679A JPS6142454B2 JP S6142454 B2 JPS6142454 B2 JP S6142454B2 JP 9679679 A JP9679679 A JP 9679679A JP 9679679 A JP9679679 A JP 9679679A JP S6142454 B2 JPS6142454 B2 JP S6142454B2
- Authority
- JP
- Japan
- Prior art keywords
- control signal
- frequency
- circuit
- audio
- signal
- 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
- 230000005236 sound signal Effects 0.000 claims description 35
- 230000001629 suppression Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 description 13
- 230000007257 malfunction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/16—Monitoring arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Radio Transmission System (AREA)
Description
【発明の詳細な説明】
本発明は、通常通話の開始前および終了後に送
受される制御信号を、音声周波数帯域内に配置し
た制御信号の送受信方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transmitting and receiving control signals in which control signals transmitted and received before and after the start and end of a normal telephone call are placed within the audio frequency band.
音声の主エネルギー帯域とは音声周波数を周波
数スペクトルで表わした時レベルが高く頻度が集
中する周波数領域をいう。 The main energy band of voice refers to the frequency region where the level and frequency are concentrated when voice frequencies are expressed as a frequency spectrum.
第１図は従来の、音声帯域内に制御信号を配置
した制御信号の送受信方法に対する音声周波数段
の回路構成を示すブロツク図である。 FIG. 1 is a block diagram showing a circuit configuration of an audio frequency stage for a conventional control signal transmission/reception method in which the control signal is placed within the audio band.
第１図ａは送信側を示し、入力側１には制御信
号を制御するためのゲート信号が加えられ、該ゲ
ート信号は制御信号発振器２を制御して、該制御
信号発信器２の出力として制御信号ｆpを作り、
この制御信号ｆpは混合部３を経て出力端４に出
る。また入力端５には音声信号ｆvが加えられ、
制御信号ｆpと同様に混合部３を経て出力端４に
出る。 FIG. 1a shows the transmitting side, in which a gate signal for controlling the control signal is added to the input side 1, and the gate signal controls the control signal oscillator 2 and outputs the control signal oscillator 2. Create a control signal f p ,
This control signal f p passes through the mixing section 3 and is outputted at the output terminal 4 . Also, an audio signal f v is applied to the input terminal 5,
Like the control signal f p , it passes through the mixing section 3 and is outputted to the output terminal 4.
ここで、音声信号ｆvと制御信号ｆpの周波数配
置は概略第２図ａに示した様になつている。音声
の主エネルギー帯域ｆxは大体1KHzを中心にして
存在する。即ち音声周波数帯域の低い側にある。
そこで、制御信号ｆpの周波数は、以下に述べる
受信側制御信号検出回路の音声信号による誤動作
を少なくするために、通常音声エネルギーの強い
周波数帯を避けて選ぶ。即ち第２図ａに示した様
に音声の主エネルギー帯域の上側に設定する。 Here, the frequency arrangement of the audio signal f v and the control signal f p is approximately as shown in FIG. 2a. The main energy band f x of voice exists around 1 KHz. That is, it is on the lower side of the audio frequency band.
Therefore, the frequency of the control signal f p is selected to avoid a frequency band in which voice energy is usually strong, in order to reduce malfunctions caused by voice signals in the receiving side control signal detection circuit described below. That is, as shown in FIG. 2a, it is set above the main energy band of the voice.
出力端４以降は増幅器或いは変調器を経るなど
して有線通信系或いは無線通信系にて送信され
る。 After the output terminal 4, the signal passes through an amplifier or a modulator and is transmitted via a wired communication system or a wireless communication system.
第１図ｂは受信側を示し、帯域通過ろ波器７、
整流回路８、タイミング回路９、検出回路１０に
より制御信号検出回路が構成されている。そして
音声帯域の受信信号は入力端６に加えられ、受信
信号が制御信号ｆpの場合には、該制御信号ｆp
は、高選択度の帯域通過ろ波器７と整流回路８と
で構成される制御信号回路（制御信号を受信して
動作する部分の回路を云い、一般に帯域ろ波器に
よつて制御信号周波出力のみを取り出す回路）に
より抽出及び整流され、タイミング回路９および
検出回路１０を経て出力端１１から取り出され通
信の制御に使用される。受信信号が音声信号ｆv
の場合には、該音声信号ｆvは、音声信号出力端
１２から取り出され、音声再現部へ送られると同
時に、該音声信号ｆvの主エネルギー帯域ｆxの成
分は、帯域通過ろ波器１３および整流回路１４か
ら成る抑圧回路（受信器の制御信号周波以外の周
波数によつてその動作を抑える部分の回路を云
い、一般には前記制御信号回路に用いる帯域ろ波
器の通過帯域と異なる通過帯域をもつ帯域ろ波器
によつて制御信号周波成分以外を取り出す回路）
１５に導かれ、該帯域通過ろ波器１３を通過し、
整流回路１４にて整流された後、上に述べた制御
信号回路動作の抑圧に使用される。これは受信信
号が音声信号の場合に該音声信号ｆv中の制御信
号に該当する周波数成分が帯域通過ろ波器７に落
ち込み、制御信号の整流回路８に出力を生じ、結
果として制御信号動作を行なう様な誤動作を生ず
るのを防止せんがためで、該音声信号の主エネル
ギー帯域ｆxの成分によつて抑圧回路１５の出力
側、即ち整流回路１４の出力側に、前記制御信号
の整流回路８の出力とは逆電位の出力を生じさせ
て、この出力を前記整流回路８の出力側に作用さ
せて該整流回路８の出力を打ち消そうとするもの
である。この作用即ち抑圧動作の程度は、前記抑
圧回路１５の感度として定義される抑圧比で表わ
されるものであり、後に述べる制御信号回路の不
動作が生じない様にする事をも考慮して適当な値
に調整される。このように前記制御信号回路と抑
圧回路１５とを備えた信号受信器であつて、音声
周波帯で使用される信号受信器が通話音声によつ
て動作する、いわゆる誤動作を防止するため、
「音声は信号周波数の成分の外に他の周波数も含
んでいる」ことを利用して、信号周波以外の周波
数成分が含まれる場合には、例え信号周波数が存
在しても動作しないようにする回路方式をもつ信
号受信器を通常抑圧形信号受信器と称している。 FIG. 1b shows the receiving side, with a bandpass filter 7,
The rectifier circuit 8, timing circuit 9, and detection circuit 10 constitute a control signal detection circuit. Then, the received signal in the voice band is applied to the input terminal 6, and when the received signal is a control signal f p , the control signal f p
is a control signal circuit (a circuit that receives a control signal and operates), which is composed of a high-selectivity band-pass filter 7 and a rectifier circuit 8; The signal is extracted and rectified by a circuit that takes out only the output, is taken out from an output terminal 11 via a timing circuit 9 and a detection circuit 10, and is used for communication control. The received signal is an audio signal f v
In this case, the audio signal f v is taken out from the audio signal output terminal 12 and sent to the audio reproduction section, and at the same time, the main energy band f x component of the audio signal f v is filtered through a band-pass filter. 13 and a rectifier circuit 14 (this refers to a circuit that suppresses the operation of the receiver at a frequency other than the control signal frequency, and generally has a passband different from the passband of the bandpass filter used in the control signal circuit). A circuit that uses a bandpass filter to extract components other than the control signal frequency components)
15 and passes through the bandpass filter 13;
After being rectified by the rectifier circuit 14, it is used to suppress the operation of the control signal circuit described above. This is because when the received signal is an audio signal, the frequency component corresponding to the control signal in the audio signal fv falls into the bandpass filter 7 and is output to the control signal rectifier circuit 8, resulting in the control signal being activated. In order to prevent malfunctions that may occur, the main energy band f x component of the audio signal causes the control signal to be rectified on the output side of the suppression circuit 15, that is, on the output side of the rectification circuit 14. The output of the circuit 8 is intended to generate an output having a potential opposite to that of the output of the circuit 8, and to apply this output to the output side of the rectifier circuit 8 to cancel the output of the rectifier circuit 8. The degree of this effect, that is, the suppression operation, is expressed by the suppression ratio defined as the sensitivity of the suppression circuit 15, and is determined appropriately in consideration of preventing the control signal circuit from malfunctioning, which will be described later. adjusted to the value. In order to prevent so-called malfunction in which the signal receiver used in the voice frequency band operates due to the voice of a telephone call, which is a signal receiver equipped with the control signal circuit and the suppression circuit 15 as described above,
Utilizing the fact that "audio includes other frequencies in addition to the signal frequency component", if a frequency component other than the signal frequency is included, it will not operate even if the signal frequency exists. A signal receiver with this circuit type is usually called a suppression type signal receiver.
以上が従来の方法の説明であるが、次の様な欠
点が存在する。即ち、上で最後に述べた様に、信
号が音声信号の場合に制御信号検出回路に抑圧を
かけることによつて、音声信号中の制御信号周波
数成分による該制御信号検出回路の誤動作を防止
しているのであるが、第２図ａの周波数配置から
わかる様に、音声信号の高周波成分にも留意する
ことが必要で、受信側第１図ｂの入力端６に到達
する迄の間において発生する音声信号の歪による
高調波が制御信号回路に落ち込む恐れがあり、従
つて抑圧比を大きくし、充分な抑圧をかけなけれ
ばならない。この事は、逆に制御信号検出回路が
不動作になる恐れを生じることになる。即ち、信
号が制御信号の場合で、Ｓ／Ｎがあまり良くない
即ちノイズが多い場合には、帯域通過ろ波器１３
に落ち込むノイズによつて制御信号検出回路に抑
圧がかかり、制御信号が受信されたにもかかわら
ず制御信号検出回路が不動作となる。 Although the conventional method has been described above, it has the following drawbacks. That is, as mentioned at the end above, by suppressing the control signal detection circuit when the signal is an audio signal, malfunction of the control signal detection circuit due to the control signal frequency component in the audio signal is prevented. However, as can be seen from the frequency arrangement in Figure 2a, it is necessary to pay attention to the high frequency components of the audio signal, which occur before reaching the receiving side input end 6 in Figure 1b. There is a risk that harmonics due to distortion of the audio signal may fall into the control signal circuit, so the suppression ratio must be increased to apply sufficient suppression. This may conversely cause the control signal detection circuit to become inoperable. That is, when the signal is a control signal and the S/N is not very good, that is, there is a lot of noise, the bandpass filter 13
The control signal detection circuit is suppressed by the noise falling in the signal, and the control signal detection circuit becomes inoperable even though a control signal is received.
以上は有線回線、無線回線等の場合について一
般的に述べたのであるが、特にFM無線回線の場
合でＳ／Ｎが劣化した場合には、ノイズの影響
で、制御信号検出回路が不動作となる恐れがより
大きいことを次に説明する。 The above is a general description of the cases of wired lines, wireless lines, etc., but especially in the case of FM wireless lines, when the S/N deteriorates, the control signal detection circuit may become inoperable due to the influence of noise. The following explains what is more likely to happen.
第２図ｂはFM無線回線においてＳ／Ｎが劣化
した場合に、受信側音声周波段の回路第１図ｂの
入力端６に加えられる音声帯域内の音声信号ｆv
と制御信号ｆpの周波数配置およびFM復調ノイズ
の分布の模様を示したものである。一点鎖線で示
したものがFM復調ノイズ分布で、第１図ｂの回
路はデシエンフアシス回路を通過した後に接続さ
れるので、周波数の低い方のノイズが、Ｓ／Ｎが
劣化する程、最大6dB／Cctの傾斜で強調されて
くる。この第２図ｂと、これまでの説明から明ら
かな様に、帯域通過ろ波器１３に落ち込むノイズ
がより多い為に制御信号検出回路にかかる抑圧も
より強くなり該制御信号回路が不動作となる恐れ
もより大きい。 FIG. 2b shows an audio signal f v within the audio band that is applied to the input terminal 6 of the receiver audio frequency stage circuit in FIG. 1b when the S/N deteriorates in the FM radio line.
This figure shows the frequency arrangement of the control signal f p and the distribution pattern of the FM demodulation noise. The one-dot chain line shows the FM demodulation noise distribution, and since the circuit in Figure 1b is connected after passing through the de-emphasis circuit, the lower frequency noise is reduced to a maximum of 6 dB/min, as the S/N deteriorates. It is emphasized by the slope of Cct. As is clear from FIG. 2b and the previous explanation, since more noise falls into the bandpass filter 13, the suppression applied to the control signal detection circuit becomes stronger, and the control signal circuit becomes inoperable. The fear that this will happen is even greater.
以上述べたような欠点があるので、抑圧回路の
抑圧比の選定が重要で、また非常に難かしい問題
ともなつている。 Because of the drawbacks mentioned above, selection of the suppression ratio of the suppression circuit is important and also a very difficult problem.
以上述べて来た説明から、一般に制御信号を音
声帯域内に配置した通信系においては、受信側の
制御信号動作に関して、次の点が要望される。 From the above explanation, in general, in a communication system in which control signals are placed within the voice band, the following points are required regarding control signal operation on the receiving side.
(イ) 入力が制御信号の場合にのみ制御信号回路は
動作し、不動作とならないこと。(a) The control signal circuit must operate only when the input is a control signal, and must not become inoperable.
(ロ) 入力が制御信号以外の場合、即ち音声信号や
ノイズ等の場合には、制御信号回路は動作しな
いこと。(b) If the input is anything other than a control signal, that is, if it is an audio signal or noise, the control signal circuit shall not operate.
本発明は以上述べた欠点を解消し、要望に答え
るためになされたものであり、その目的は、受信
側における制御信号検出回路が、制御信号に対し
ては確実に動作し、制御信号以外の、音声信号や
ノイズに対しては誤動作しない様な制御信号の送
受信方法を提供することにある。 The present invention has been made to eliminate the above-mentioned drawbacks and meet the demands.The purpose of the present invention is to ensure that the control signal detection circuit on the receiving side operates reliably for control signals and for detecting signals other than control signals. The object of the present invention is to provide a control signal transmission/reception method that does not malfunction in response to audio signals or noise.
上記の目的を達成するための、本発明の要旨と
するところは、音声周波数帯域内の音声の主エネ
ルギー帯域と制御信号周波数の配置を、送信側に
おいて周波数反転を行なうことによつて、音声の
主エネルギー帯域を周波数の高い側に移動させ、
制御信号を前記音声の主エネルギー帯域の下側に
配置せしめて送信し、また受信側においては、音
声信号回路において、送信側で行なつた操作を逆
に行なつて元の音声信号を復元すると言う制御信
号の送受信方法である。 In order to achieve the above object, the gist of the present invention is to invert the arrangement of the main energy band of the voice and the control signal frequency within the voice frequency band on the transmitting side. Move the main energy band to the higher frequency side,
The control signal is placed below the main energy band of the voice and transmitted, and on the receiving side, the operation performed on the transmitting side is reversed in the audio signal circuit to restore the original audio signal. This is a method of transmitting and receiving control signals.
第３図は本発明の、音声帯域内に制御信号を配
置した制御信号の送受信方法における音声周波段
の回路構成の実施例を示すブロツク図である。 FIG. 3 is a block diagram showing an embodiment of the circuit configuration of the audio frequency stage in the control signal transmission/reception method in which the control signal is arranged within the audio band according to the present invention.
第３図ａは、送信側を示す。前に説明した従来
の方法と異なる所は、入力端５に加えられた音声
信号ｆvは、周波数反転回路３１に入り周波数反
転させられた後、混合部３を経て出力端４に出
る。この周波数反転回路３１は、その一例を第５
図ａに示した様に例えば音声帯域を0.3〜3KHzと
すれば、3.3KHzの発振器５１を設け、この発振
器５１と音声信号ｆvとを混合器５２に加え、こ
の混合器５２の出力から（3.3KHz―ｆv）の差信
号を取り出すべく、この場合約3KHzの低域ろ波
器５３を混合器５２の出力側に設けることによつ
て得られる。また、制御信号は、従来の場合とは
周波数を変え、音声周波数帯域内の下側部分に位
置する様に制御信号発振器２′の周波数を設定す
る。この制御信号周波数を′pで表わすこととす
る。この場合の音声信号と制御信号の周波数配置
は概略第４図ａに示した様になる。即ち音声の主
エネルギー帯域は反転されて、音声周波数帯域内
の上側部分に移動させられ、その下側に制御信号
f′pが配置されている。 Figure 3a shows the transmitting side. The difference from the conventional method described above is that the audio signal f v applied to the input terminal 5 enters a frequency inverting circuit 31 and has its frequency inverted, and then passes through the mixing section 3 and outputs to the output terminal 4 . This frequency inversion circuit 31 is an example of the fifth frequency inversion circuit 31.
For example, if the audio band is 0.3 to 3KHz as shown in FIG. In this case, a low-pass filter 53 of about 3 KHz is provided on the output side of the mixer 52 to extract a difference signal of 3.3 KHz-f v ). Further, the frequency of the control signal is changed from that in the conventional case, and the frequency of the control signal oscillator 2' is set so as to be located in the lower part of the audio frequency band. Let this control signal frequency be expressed as ′ p . In this case, the frequency arrangement of the audio signal and the control signal is approximately as shown in FIG. 4a. That is, the main energy band of the voice is inverted and moved to the upper part of the voice frequency band, and the control signal is placed below it.
f′ p is located.
次に、第３図ｂに受信側を示す。従来の方法と
異なる所は、音声信号が、上で説明した様に、周
波数反転させられているので、受信信号が音声信
号の場合には、周波数反転回路３２に入れて、こ
こで周波数反転させて出力端１２に元の音声信号
ｆvを取り出す。この周波数反転回路３２は、そ
の一例を第５図ｂに示した様に、送信側で使用し
た周波数反転回路３１と全く同じものであり、
唯、通過する周波数が異なるのみであり、これは
第５図ｂ内の傍に記してある。その他、音声の主
エネルギー帯域f′xの周波数帯および制御信号の
周波数′pに対応して、帯域通過ろ波器１３′、
抑圧回路１５′および帯域通過ろ波器７′が設けら
れる。この第３図ｂの回路の基本的動作は、第１
図ｂについて説明した従来の抑圧形信号受信機動
作と同様であるので省略する。 Next, FIG. 3b shows the receiving side. The difference from the conventional method is that the audio signal is frequency inverted as explained above, so if the received signal is an audio signal, it is input to the frequency inversion circuit 32 and the frequency is inverted there. The original audio signal fv is taken out at the output terminal 12. This frequency inversion circuit 32 is exactly the same as the frequency inversion circuit 31 used on the transmitting side, as an example is shown in FIG. 5b.
The only difference is the frequency that is passed through, which is noted in the sidebar in FIG. 5b. In addition, a bandpass filter 13', corresponding to the frequency band of the main energy band f'x of the voice and the frequency ' p of the control signal,
A suppression circuit 15' and a bandpass filter 7' are provided. The basic operation of the circuit shown in FIG. 3b is as follows:
The operation is the same as that of the conventional suppression type signal receiver explained with reference to FIG. b, so a description thereof will be omitted.
第３図ａにおける周波数反転回路３１は、第３
図a′に示す本発明の送信側の回路構成の他の実施
例に示す如く、混合部３を通過した後側に入れる
ことも出来る。但しこの場合には、制御信号も周
波数反転回路３１によつて周波数が変るので、周
波数反転回路３１の出力が結果的にf′pとなる様
に予かじめ″pの周波数としておく必要がある。 The frequency inversion circuit 31 in FIG.
As shown in another embodiment of the circuit configuration on the transmitting side of the present invention shown in FIG. However, in this case, since the frequency of the control signal is also changed by the frequency inversion circuit 31, it is necessary to set the frequency to "p" in advance so that the output of the frequency inversion circuit 31 will eventually become f' p . .
第３図について説明した本発明の方法に対する
構成において、重要な点は、音声周波数帯域内に
おける音声の主エネルギー帯域と制御信号周波数
の配置である。第４図ａについて説明した様に、
音声の主エネルギー帯域f′xが制御信号周波数
′pの上側に位置しているので、受信側第３図ｂ
の入力端６に到達する迄の間において発生する音
声信号の歪による高調波は、制御信号回路には落
ち込むことは無く、この音声信号の高調波による
制御信号回路の誤動作は考える必要はない。従つ
て抑圧回路の抑圧比は、それ程大きくとる必要も
なく単に、音声信号そのものの中の制御信号成分
およびノイズの制御信号成分を考えて抑圧比を設
定すればよい。抑圧比が小さくて済む事は受信信
号が制御信号の場合で、特にＳ／Ｎが悪い場合、
即ちノイズが多い場合に、先に第１図の従来技術
の欠点の所で述べた様な帯域通過ろ波器１３に落
ち込むノイズによつて制御信号検出回路に抑圧過
大による制御信号回路の不動作と言う現象が生じ
ない様にする事が容易となる。即ち抑圧比の選定
が非常に容易となる。 In the arrangement for the method of the invention described with reference to FIG. 3, an important point is the arrangement of the main energy band of the voice and the control signal frequency within the voice frequency band. As explained in Figure 4a,
Since the main energy band f' x of the voice is located above the control signal frequency ' p , the receiving side Fig. 3b
The harmonics due to the distortion of the audio signal generated before reaching the input terminal 6 of the audio signal do not fall into the control signal circuit, and there is no need to consider malfunction of the control signal circuit due to the harmonics of the audio signal. Therefore, the suppression ratio of the suppression circuit does not need to be very large; it is sufficient to simply set the suppression ratio by considering the control signal component in the audio signal itself and the control signal component of noise. The suppression ratio can be small only when the received signal is a control signal, especially when the S/N is poor.
That is, when there is a lot of noise, the noise that falls into the bandpass filter 13, as described above in the drawback of the prior art shown in FIG. This makes it easy to prevent this phenomenon from occurring. In other words, selection of the suppression ratio becomes very easy.
次に第４図ｂは、FM無線回線において、Ｓ／
Ｎが劣化した場合に受信側音声周波段の回路第３
図ｂの入力端６に加えられる音声帯域内の、音声
信号と制御信号の周波数配置およびFM復調ノイ
ズの分布の模様を示したもので、従来技術の欠点
の所で述べた第２図ｂに対応するものである。
FM復調ノイズ分布については、第２図ｂについ
て説明したものと同じであるが、音声の主エネル
ギー帯域f′xが上側に、制御信号f′pが下側に配置
されているので、FM復調ノイズの影響が、第２
図ｂについて説明した場合と大いに異なる。即ち
音声の主エネルギー帯域f′xに入るFM復調ノイズ
量は、第２図ｂの場合のｆxに入るノイズ量と比
べて非常に少なく、このノイズによる制御信号回
路動作に対する抑圧作用は殆んど無いので、制御
信号が来た場合に制御信号回路が不動作となるこ
とは殆んど無い様になし得る。また制御信号周波
数′p近傍のノイズ量は、第２図ｂの場合のｆp
近傍のノイズ量よりも多いが、制御信号用の帯域
通過ろ波器の選択度は高く、狭帯域とし、またタ
イミング回路９の動作タイミングを或る程度とつ
て、このノイズによる制御信号回路の誤動作は防
止できる。 Next, Fig. 4b shows that S/
If N deteriorates, the third circuit of the audio frequency stage on the receiving side
This figure shows the frequency arrangement of the audio signal and control signal and the distribution pattern of FM demodulation noise within the audio band applied to the input terminal 6 in Figure b. It corresponds to this.
The FM demodulation noise distribution is the same as that explained in Fig. 2b , but the main energy band f ' The influence of noise is the second
This is very different from the case described with respect to Figure b. In other words, the amount of FM demodulation noise entering the main energy band f' x of the voice is very small compared to the amount of noise entering f Therefore, it is possible to almost never cause the control signal circuit to become inoperable when a control signal is received. Also, the amount of noise near the control signal frequency ′ p is f p in the case of Fig. 2b.
Although it is larger than the amount of noise in the vicinity, the selectivity of the bandpass filter for the control signal is high and narrow band, and the operation timing of the timing circuit 9 is set to a certain degree to prevent malfunction of the control signal circuit due to this noise. can be prevented.
以上述べた本発明の方法に対する実施例におい
ては、音声の主エネルギー帯域を、送信側におい
て、周波数の高い側に移動させ、受信側において
再び元に戻し復元する方法として、周波数反転回
路を用いた。しかし、別の方法として音声の主エ
ネルギー帯域を周波数の高い側に移動させたり、
音声周波数帯域内の音声信号を抽出することがで
きる回路であれば、周波数反転回路の代りに用い
てもよい。 In the embodiment of the method of the present invention described above, a frequency inversion circuit is used as a method for moving the main energy band of the voice to the higher frequency side on the transmitting side and returning it to the original state again on the receiving side. . However, another method is to move the main energy band of the voice to the higher frequency side,
Any circuit that can extract audio signals within the audio frequency band may be used in place of the frequency inversion circuit.
以上詳細に説明した様に、本発明の制御信号の
送受信方法によれば、従来方法に比べ音声誤動作
率が低く、特にFM無線回線に於ては復調Ｓ／Ｎ
が劣化しても確実に動作するので、制御信号に対
しては確実に動作し、音声信号やノイズに対して
は動作しないと言う理想的な通信系にすることが
できる。 As explained in detail above, according to the control signal transmission/reception method of the present invention, the audio malfunction rate is lower than that of the conventional method, and the demodulation S/N ratio is particularly low in FM radio lines.
Since it operates reliably even if the signal deteriorates, it is possible to create an ideal communication system that operates reliably in response to control signals and does not operate in response to voice signals or noise.
第１図は従来の、音声帯域内に制御信号を配置
した制御信号の送受信方法に対する音声周波段の
回路構成を示すブロツク図で、第１図ａは送信
側、第１図ｂは受信側を示す。第２図ａは、従来
の音声信号と制御信号の周波数配置の概略を示
す。第２図ｂは、従来の制御信号の送受信方法に
おけるFM無線回線において、Ｓ／Ｎが劣化した
場合に、受信側音声周波段の回路第１図ｂの入力
端６に加えられる音声信号と制御信号の周波数配
置およびFM復調ノイズの分布の模様を示す。第
３図は本発明の、音声帯域内に制御信号を配置し
た制御信号の送受信方法に対する音声周波段の回
路構成の実施例を示すブロツク図で、第３図ａは
送信側、第３図ｂは受信側を示し、また第３図
a′は本発明の送信側の回路構成の他の実施例を示
す。第４図ａは本発明の、音声信号と制御信号の
周波数配置の概略を示す。第４図ｂは本発明の制
御信号の送受信方法におけるFM無線回線におい
てＳ／Ｎが劣化した場合に受信側音声周波段の回
路第３図ｂの入力端６に加えられる音声信号と制
御信号の周波数配置およびFM復調ノイズの分布
の模様を示す。第５図ａは第３図ａにおける周波
数反転回路３１の一実施例を示すブロツク図であ
る。第５図ｂは第３図ｂにおける周波数反転回路
３２の一実施例を示すブロツク図である。
１……ゲート入力、２，２′，２″……制御信号
発振器、３……混合部、４……出力端、５……入
力端、６……入力端、７，７′……帯域通過ろ波
器、８……整流回路、９……タイミング回路、１
０……検出回路、１１……出力端、１２……音声
信号出力端、１３，１３′……帯域通過ろ波器、
１４……整流回路、１５，１５′……抑圧回路、
３１……周波数反転回路、３２……周波数反転回
路、５１……発振器、５２……混合器、５３……
低域ろ波器、ｆp，f′p，f″p……制御信号、ｆv…
…音声信号、ｆx，f′x……音声の主エネルギー帯
域。
Fig. 1 is a block diagram showing the circuit configuration of an audio frequency stage for a conventional control signal transmission/reception method in which the control signal is placed within the audio band. Fig. 1a shows the transmitting side, and Fig. 1b shows the receiving side. show. FIG. 2a schematically shows the frequency allocation of conventional audio signals and control signals. FIG. 2b shows the audio signal and control signal applied to the input terminal 6 of the circuit of the receiving side audio frequency stage in FIG. It shows the frequency arrangement of the signal and the distribution pattern of FM demodulation noise. FIG. 3 is a block diagram showing an embodiment of the circuit configuration of the audio frequency stage for the control signal transmitting/receiving method in which the control signal is placed within the audio band according to the present invention. indicates the receiving side, and Fig. 3
a' shows another embodiment of the circuit configuration on the transmitting side of the present invention. FIG. 4a schematically shows the frequency allocation of the audio signal and control signal according to the present invention. FIG. 4b shows the relationship between the audio signal and the control signal that is applied to the input end 6 of the receiving side audio frequency stage circuit in FIG. It shows the frequency arrangement and the distribution pattern of FM demodulation noise. FIG. 5a is a block diagram showing an embodiment of the frequency inversion circuit 31 in FIG. 3a. FIG. 5b is a block diagram showing an embodiment of the frequency inversion circuit 32 in FIG. 3b. 1... Gate input, 2, 2', 2''... Control signal oscillator, 3... Mixing section, 4... Output end, 5... Input end, 6... Input end, 7, 7'... Band Pass filter, 8... Rectifier circuit, 9... Timing circuit, 1
0...Detection circuit, 11...Output end, 12...Audio signal output end, 13, 13'...Band pass filter,
14... Rectifier circuit, 15, 15'... Suppression circuit,
31... Frequency inversion circuit, 32... Frequency inversion circuit, 51... Oscillator, 52... Mixer, 53...
Low-pass filter, f p , f′ p , f″ p ...control signal, f v ...
...Speech signal, f x , f' x ... Main energy band of sound.
Claims (1)
御信号を送受信する制御信号の送受信方法におい
て、送信側では第１の周波数反転回路を用いて音
声の主エネルギー帯域を周波数の高い側に移動さ
せるとともに、前記制御信号を前記音声の主エネ
ルギー帯域よりも低い側に配置させて送信し、受
信側では抑圧形信号受信器により前記音声の主エ
ネルギー帯域よりも低い側に配置された状態の前
記制御信号をそのまま抽出するとともに、前記音
声周波数帯域内の音声信号を第２の周波数反転回
路を用いて抽出することを特徴とする制御信号の
送受信方法。1 In a control signal transmission and reception method that transmits and receives control signals within the audio frequency band using an FM radio line, the transmitting side uses a first frequency inversion circuit to move the main energy band of the audio to the higher frequency side, and , the control signal is placed on the side lower than the main energy band of the voice and transmitted, and the control signal is placed on the side lower than the main energy band of the voice by a suppression signal receiver on the receiving side. A control signal transmission/reception method characterized in that the control signal is extracted as is, and the audio signal within the audio frequency band is extracted using a second frequency inversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9679679A JPS5621463A (en) | 1979-07-31 | 1979-07-31 | Transmission and receiving method of control signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9679679A JPS5621463A (en) | 1979-07-31 | 1979-07-31 | Transmission and receiving method of control signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5621463A JPS5621463A (en) | 1981-02-27 |
| JPS6142454B2 true JPS6142454B2 (en) | 1986-09-20 |
Family
ID=14174584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9679679A Granted JPS5621463A (en) | 1979-07-31 | 1979-07-31 | Transmission and receiving method of control signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5621463A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS637046A (en) * | 1986-06-27 | 1988-01-12 | Fujitsu Denso Ltd | Signal band optimizing device |
| US6528679B1 (en) | 1999-09-29 | 2003-03-04 | Tosoh Corporation | Process for producing phenyl esters using palladium-based catalysts |
-
1979
- 1979-07-31 JP JP9679679A patent/JPS5621463A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5621463A (en) | 1981-02-27 |
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