JPS61200722A - Pulse noise detecting circuit for am receiver - Google Patents

Abstract

PURPOSE:To decrease the effect of disturbance due to beat between broadcast stations by allowing the 1st and 2nd holding means to hold a pulse noise component detecting signal, switching alternately the input/output of both the holding means and generating a pulse signal from the output. CONSTITUTION:When an output of a mixing circuit 3 of an AM receiver section I is fetched by a pulse noise detection section II, an IF filter 7 eliminates a local oscillating signal, the result is subject to amplification 8 and detection 9 through a BPF 10, then a beat frequency signal S1 of an adjacent broadcast wave appears at the output of the BPF 10. A pulse signal S2 equal to or shorter than the longest period of the beat signal is generated from a clock generator 14, and a pulse signal S5 applies frequency division 15 to the signal S2 and a signal S3 as a result of phase inversion 16 to the signal S2 are generated. A switch SW1 is thrown respectively to the position (a) or (b) depending on the H or L level of the signal S3 to hold the signal S1 to capacitors C1, C2. A switch SW2 is thrown respectively to the position a' or b' depending on the L or H level of the signal S5 to extract signals S6, S4 held in the capacitors C1, C2, the extracted signals are compared (17) respectively with the signal S1, and when the level difference is large, it is discriminated that a pulse noise exists and a gate 6 is controlled via a switch SW2 and an ST circuit 11.

Description

【発明の詳細な説明】 八　左東上のｆ］用分釘 不発力は局部発振伯号乞―云し、パルス麹汁成分を＆及
して受信機のゲートを匍制御するＡＭ受偏機のパルス髄
ｆ検出回路に関する。[Detailed Description of the Invention] 8. Upper left and right f This invention relates to a pulse f detection circuit.

Ｂ　発明の似景 本発明のパルス轍ｆ慣出回路は／ｌａ受信受信語いて、
パルスｍｆ底分検仮信号を保持する二つの保持手段ｔ＠
え、受信布望１ｇ号以外の電波が存在するときに起るビ
ート信号の周期でそれらの保持手段の出方ン切り侠え、
それらの保持手段を経ないパルスｍｔｉ分引１♂号と上
紀出カン比板することによってパルス幡ｆ底分が検出さ
れる。B. Simulation of the invention The pulse rut f habituation circuit of the present invention is /la reception/reception.
Two holding means t@ for holding the pulse mf bottom test temporary signal
Eh, how do these holding means come out depending on the period of the beat signal that occurs when radio waves other than 1g are present?
The bottom of the pulse f is detected by comparing it with the pulse mti fraction 1♂ which does not pass through these holding means.

Ｃ（２Ｅ米の技術 第５図は従来ｆ２ＩｉＩｌｃ便用さ九ているパルス蝿曾
検出回路を言むＡＭ受伯機の檜成を示すブロック図で、
図中工はＡＭ受受信部で、Ｕはパルス鑵晋枳出しである
。ＡＭ受（ｇ嶺部１はアンテナ１から入力されたｉａ匝
χ増幅する婉周改増輻器２、局改数震侠χ行な５屁台回
路３、ＩＦ偲号を増幅する中間ＸＪｔＢｉ、増幅器４お
よび検技姦５から成り、雑音を除去するゲート回路６を
通してオーディオ係号か出力される。C (2E US technology Figure 5 is a block diagram showing the construction of an AM machine, which refers to the pulse fly detection circuit that has conventionally been used for f2IiIlc).
The symbol in the figure is the AM receiver/receiver section, and U is the pulse controller. AM receiver (G ridge part 1 includes an amplifier 2 that amplifies the ia signal input from the antenna 1, a 5-channel circuit 3 that amplifies the ia signal input from the antenna 1, an intermediate XJtBi that amplifies the IF signal, It consists of an amplifier 4 and a test circuit 5, and is outputted as an audio signal through a gate circuit 6 that removes noise.

パルス錐曾検出ｂｕは比較的広帯域となっているＩＦ倍
信号して混合回路３の出力信号を用いろ。For the pulse cone detection bu, use the output signal of the mixing circuit 3 as an IF multiplied signal having a relatively wide band.

この信号を、混合Ｉｉ２回路３の出力の中に台！れろ局
し発振信号のもれ￥浴す定めのＩＦフイルり７、ｐＩＩ
幅姦８．慎肢姦９、パルス鑵晋成分ン取り出すための帯
域連通フィルタｌＯン通し、スイッチングパルスを発生
させるためのシュミツトドリカ回路Ｌｌ−通してスイッ
チングパルスを作り、ゲート回路６を制御する。帝城通
廟フィルタｌＯの帯域は、万一デイオ信号を取り除き、
小賢な高城成分を洛すように定められろが、轍音慣出に
用いているＩＦ倍信号帝城か広いために、布孟受１ｇ　
（１！吟以外も言むこととなり、布望受伯１８号以外の
放送改とのビート信号がＷＩ城通過フィルタＩＯの出力
に主じ、そｎがパルス維廿検出乞妨晋する・ したがって、琳５図にボ丁促米の方式では、布置信号以
外のｍａかその近（に■るとぎは、パルス雑音検出が行
なえない欠点がＭる。Place this signal into the output of mixing Ii2 circuit 3! Determined IF filter for leakage of localized oscillation signal 7, pII
Broad rape 8. The circuit 9 passes through a band communication filter 10 for extracting the pulse component, and passes through a Schmidt driver circuit L1 for generating switching pulses to generate switching pulses and control the gate circuit 6. The band of the Teijo Doribyo filter lO is to remove the dio signal by any chance.
It is determined that the clever Takagi component will be used, but since the IF double signal used for rut sound is wide, Fu Menguke 1g
(In addition to 1! Gin, the beat signal with the broadcasting system other than No. 18 is mainly the output of the WI castle pass filter IO, which interferes with the detection of the pulse transmission.) In the method shown in Fig. 5, pulse noise detection cannot be performed for signals other than the placement signal at or near ma.

８ｉＦＧ６−蚤工この間ｌ１１１を虐火するために考え
られている憾音検出都ン示す。ＡＭ放送のチャンネルス
ペースは、９または１０　ｋＨｚである。したがつ℃ビ
ート局ｒＢｉ数は９　ｋＨｚの喪叡倍となる。それ故、
９ｋＨｚの姫欽階の周阪数成分を除去するにめに、遅地
業子１２を用いた面形フィルタ１３が挿入されている。8iFG6-Flea factory indicates the sound detection city which is currently being considered to burn down l111. The channel spacing for AM broadcasting is 9 or 10 kHz. Therefore, the frequency of the °C beat station rBi is 9 kHz. Therefore,
A planar filter 13 using a slow filter 12 is inserted in order to remove the 9 kHz frequency component.

Ｄ　発明が解決しようとする問題点 第６図に示す回路ではビート周は欽厄分は除去されるが
、この１１地素子口の′ｉ！Ａ地時間は１００μｓ程度
となり、価格が尚い欠点があり、笑用化されていない。D Problems to be Solved by the Invention In the circuit shown in FIG. 6, the beat frequency is eliminated, but the 'i! The ground time is about 100 μs, and it has disadvantages such as low price, so it is not put into commercial use.

本発明の目的は、したがって、）Ｖ斌嶌子を用いること
なしに、第６図に下す回路χ声」じ目的を遅することが
できろ、すなわち放送局間のビートによる妨害の影響？
減少させろことができるＡＭＭ信機のパルス幡を検出回
路ン提供することである。The object of the present invention is, therefore, to be able to delay the same object as shown in the circuit shown in FIG. 6 without using a V-bin, i.e., the effect of interference caused by beats between broadcast stations.
It is an object of the present invention to provide a detection circuit that can reduce the pulse field of an AMM transmitter.

Ｅ　　Ｉ’ｊｊ題点を解決するための手段上記目的を達
成する定めに、本発明によるＡＭ５２″Ｍ慎のパルス自
−ｆ扱出回路は、パルス雑音成分慎［（ａ号χ株付する
第１および第２の保持手段と、組部１および第２の保持
手段の入力？交゛互に切り換える９侯え手段と、法皇１
および第２の保持手段の出力を切り換える９侠え手段と
、上記第１の保持手段の入力が接続されているとき上記
第２の保持手段の出力が接続され、上記第２の保持手段
の入力が接続されているとぎ上記第１の保持手段の出力
が接続されるように父互に上記入出力を制御する９侠え
信号発生手段と、父互に出力される上記保持手段の出力
信号と上とパルスｍｔ成分検改イｂ号くよりパルス信号
全発生する判定パルス発生手段とを冨むことｔ景旨とす
る。Means for Solving the Problems In order to achieve the above object, the pulse self-f handling circuit of the AM52''M according to the present invention has been proposed. 1 and 2nd holding means, 9 holding means for alternately switching the input of assembly part 1 and 2nd holding means, and Pope 1
and a control means for switching the output of the second holding means, and when the input of the first holding means is connected, the output of the second holding means is connected, and the input of the second holding means is connected. 9. A control signal generation means for mutually controlling the input/output so that the output of the first holding means is connected to the first holding means; and an output signal of the holding means outputted to each other. The purpose of the present invention is to provide a judgment pulse generating means for generating all pulse signals in order to detect the pulse mt component.

上記第ｌおよび第２の保持手段の出力？切り挾える９洪
え手段、上記９候え信号発生手段、および判定パルス発
生段は簡単な微分回路？富む手段によって（ｌき供えら
れることができる。Outputs of the first and second holding means? Are the 9-pitching means, the 9-candidate signal generating means, and the judgment pulse generating stage a simple differentiating circuit? It can be provided by means of abundance.

Ｆ　作用 パルス俺音成分検仮イぎ号ヲ＆侍する手段が放送局間の
ビートの周期で切り換えられ、その出力が一周期連れの
パルス鑵ｔｇ分検改信号と比軟され、その差だけが間−
となるから、放送局間のビートによろ妨害の影響χ減少
させることができる。F The means for acting on the sound component of the pulse signal is switched at the frequency of the beat between the broadcasting stations, and its output is compared with the pulse signal of the same cycle, and the difference is only the difference. Between
Therefore, the influence of interference χ can be reduced by the beat between broadcast stations.

以下Ｋ、図面！＃照しながら、夫施例を用いて不発ａＡ
ン一層評細に説明するが、それらは例示に過ぎず、本発
明の枠？越えることなしにいろいろな笈＃ヤ改良があり
得ることは勿論である。K below, drawings! # While using the husband example, misfire aA
Although these will be explained in more detail, they are merely examples and do not fall within the scope of the present invention. Of course, various improvements can be made without exceeding the above.

Ｇ　実施例 第１図は本発明によるパルスＩｋｔ挾出回路ン言むＡＭ
受ｉ機の一夾施例の構成を示すブロック凶で、図中第５
図と共通する引用舎号は第５図におけろものと同じｂ分
を表わす。第２図は第１図に示すＩ！１２回路の中のい
ろいろな点くおけろ信号成形を示す。G Embodiment FIG. 1 shows a pulse Ikt interpolation circuit according to the present invention.
The fifth block in the diagram shows the configuration of one example of the receiver.
Citation numbers that are common to the figures represent the same parts b as those in Figure 5. Figure 2 shows the I! shown in Figure 1! 12 shows signal shaping at various points in the circuit.

第１図に示すパルス雑音検出部Ｕに入力されるＩＦ（３
号Ｉ′ｉ布望ｇ３号の他、これに隣接する放送波のＩＦ
倍信号よび受信機の局し発振信号等も言まれろ。したが
って、ＩＦフィルタ７によって局部発振信号を除くと、
希望信号とこ九に隣接する複数の放送波のＩＦ（’！を
号が得られろ。これン増幅器８ｙａ−通し、検波すると
恨叔器９の出力に放送波のチャンネルスペース９または
ｌｔｌ　ｋＨｚのＪＭ畝漸のビート信号が生じる。この
ビート信号はパルス雑音慣出都に入力されるＩＦ信号′
？￥１域暢内に入る放送波が二つ以上の時に発生し、そ
れらの奇数送波が無変調であれば、ビート信号のレベル
と局ＩＮ数は一定となる。しかし、放送波に振＠変−が
ある場合には、ビート信号のレベルは放送波の変調レベ
ルで変化する。しかし、放送波の変Ｂ）１４周波数はチ
ャンネルスペースの９！ＬはＩＬＪ　ｋＨｚ以下の周波
数におさえられていることから、ビート信号のレベル入
化の周波数はビート周波数より低い。IF (3) input to the pulse noise detection unit U shown in FIG.
In addition to No. I'i Fubog3, the adjacent broadcast wave IF
Please also mention the double signal and the receiver's local oscillation signal. Therefore, if the local oscillation signal is removed by the IF filter 7,
You can obtain the IF ('!) signal of multiple broadcast waves adjacent to the desired signal. When this is passed through the amplifier 8ya- and detected, the broadcast wave channel space 9 or JM of ltl kHz is output to the output of the transmitter 9. A progressive beat signal is generated.This beat signal is an IF signal input to the pulse noise generator.
? This occurs when two or more broadcast waves fall within the ¥1 range, and if those odd-numbered transmission waves are unmodulated, the level of the beat signal and the number of stations will be constant. However, when there is a fluctuation in the broadcast wave, the level of the beat signal changes depending on the modulation level of the broadcast wave. However, the change in the broadcast wave B) 14 frequency is 9 of the channel space! Since L is suppressed to a frequency below ILJ kHz, the frequency at which the level of the beat signal is input is lower than the beat frequency.

したがって、ビート信号の胸奴数は一疋で、振幅変化は
ビート周仮数に対してゆっくりとした変動であると考え
ることができる。ビート信号が二つ以上あると、その曾
ｉ伯呼は嶌２図（ａｌに示すように１周期性を付つ形と
なり、その周期はチャンネルスペースにより、１７９　
ｋＨｚ　！−は１八〇　ｋＨｚＫ等しいｊｉ長周期Ｔと
なる。したがって、放送波の振輻父調によってビートの
曾成倍号は若干の振幅のずれが住するものの１／９ｋＨ
ｚまたは１７１０　ｋｋｉｚの周期で等しい振−′ｌ￥
：に＠り返す。Therefore, it can be considered that the beat signal has a constant number of pulses, and the amplitude changes slowly with respect to the beat period mantissa. When there are two or more beat signals, their frequency becomes 1 periodic as shown in Figure 2 (al), and the period is 179 depending on the channel space.
kHz! - is a long period T equal to 180 kHz. Therefore, the frequency of the beat is 1/9 kHz, although there is a slight deviation in amplitude due to the convergence of the broadcast wave.
Equal vibration with a period of z or 1710 kkiz -'l\
: Reply to @.

本発明はこれに旭目し、ビートの最長周期Ｔごとの振幅
を比軟し、このレベル差か熾輻λ論による変化以上の値
となった時は、パルス性？ｍｔの混入として検出を行な
うものである。The present invention has focused on this, and softens the amplitude for each longest period T of the beat, and when the level difference exceeds the change due to the convergence λ theory, is it a pulse? Detection is performed as mt contamination.

第１図のパルス雑音検出ａｔＵについてさらに詳しく説
明する。混合す路３から入った信号はＩＦフィルタ７に
よって、ＩＰ倍信号埴り出される。The pulse noise detection atU shown in FIG. 1 will be explained in more detail. The signal input from the mixing path 3 is extracted by an IF filter 7 into an IP multiplied signal.

こｒＬを増幅器８によって増幅し、検反姦９で検反する
と、その出力ＫＩＦ信号の撮部成分が得られる。この恢
改信号には布望受僅信号のオーディオ取分が生じるが、
屁合器３の出力のパルスミｔ検出信号の周仮数帝城が広
いので、オーディオ周波数成分以上の扁い周改叙既分も
有する。したがって、この構成信号を帯域通過フィルタ
ｌＯを通し。When this rL is amplified by an amplifier 8 and tested by a tester 9, the imaging unit component of the output KIF signal is obtained. This conversion signal has an audio component of the signal that receives the request, but
Since the frequency and mantissa of the pulse detection signal output from the combinator 3 is wide, it also has a narrower frequency and mantissa than the audio frequency component. Therefore, this constituent signal is passed through a bandpass filter lO.

オーディオ信号取分と、ＩＦ＋Ｍ送波成分等の年債な尚
い周ｖ１．数成分Ｖ＊り除（と、このフィルタ出力には
パルス性雑音が倚られる。しかし［ｅ放送波がある場合
には、フィルタｌＯの帝域内のビート局ｒＢＬ数成分は
除けない。第２図［ａｌはパルス性雑音と複数のビート
信号かある一合σ）合板通過フィルタｌＯの出力信号を
示す。ビートによる最長周期ｔＴとすると、嶽輻はＴの
周期ごとにＰＩ　＊　Ｔ２　＊Ｐ１．Ｐ４・・・と同一
レベルとなる。この時糾鞄で示す雑音か時点Ｔ２に混入
したとすれは、Ｔ２はＴ４のレベルとなる。Ｔ２か雑音
であるか否かはＰｌとの比較において判定される。The audio signal portion and the frequency v1. The number component V* is removed (and pulse noise is contained in the output of this filter. However, if there is a broadcast wave, the number component of the beat station rBL within the range of the filter IO cannot be removed. Fig. 2 [al is the sum of pulse noise and a plurality of beat signals σ) represents the output signal of the plywood pass filter lO. Assuming that the longest cycle of beats is tT, the convergence is PI * T2 * P1. It is at the same level as P4... At this time, if the noise shown in the background is mixed in at time T2, T2 will be at the level of T4. Whether T2 is noise or not is determined by comparing it with Pl.

クロック発庄器１４ヲ工、第２図（ｂ）に示すようＫ。A clock generator 14 was constructed, as shown in Fig. 2(b).

Ｔ　ｉ／）周期でΔＴのパルス幅を持つ信号Ｓ２Ｖ、出
力する。これを７リツプ７０ツブ１４で分局し、第２図
ｔｅｌに示す８５（１）パルスを侍、スイッチｓｗ２’
ｖ制偽する。さらＫＳ５の信号を反転器１６によって反
転し、Ｓ３の信号を得る。Ｓ３の信号）１スイツチＳＷ
　Ｙｆ！ｒｌＪｉｉｌＬ、　Ｓ　　がＨの時スイッチＳ
ＷＩ　Ｙ　ａｌ３ ｉｌｌｌｌｉｌに、Ｓ３が１Ｌ′の時はスイッチ謂、’
＋ｒｂ肯にする。A signal S2V having a pulse width of ΔT with a period of T i/) is output. This is divided into 7 rip 70 tubes 14, and the 85(1) pulse shown in FIG.
V system fake. Furthermore, the signal of KS5 is inverted by an inverter 16 to obtain the signal of S3. S3 signal) 1 switch SW
Yf! rlJiilL, switch S when S is H
WI Y al3 illllil, when S3 is 1L', the switch is called '
+rb Make it positive.

スイッチ謂、がａｎからｂ−に移る時、コンデンサｃ、
　ｉｔ　ｂ　＊に移ろ１ｒｓＯのＳｌのレベル？保持し
、ｂ伽から２−に移る時【工ａ側に移る直前の８１のレ
ベルを保持する。When the switch so-called moves from an to b-, the capacitor c,
Let's move on to it b * 1rsO's Sl level? When moving from b to 2-, hold the level 81 immediately before moving to a side.

スイッチ謂の制伜イ６号Ｓ３はＴのＭｊｌＩＡでＨ五 と１Ｌ＃ン繰り返し、Ｔ１で°）ｌ　、　Ｔ２で　Ｌ　
、　Ｔ。Switch so-called restriction No. 6 S3 repeats H5 and 1L#n at MjlIA of T, °)l at T1, L at T2
, T.

でＨ９・・・の変化となる。したがって、スイッチＳＷ
１のａｌｌｌの出力、すなわちコンデンサＣ３で得られ
る信号Ｓ４は第２図（ｄｌに示す信号となる。すなわち
時点Ｔ２において第２図（ａ）　Ｋ示すＳｌの信号のＰ
２０レベルｖ２が保持され、時点Ｔ３までコンデンサＣ
１で保たれる。一方スイッテＳＷ５はＳ５によって劃−
さ九るか、Ｓ５がＨ′の時、スイッチｓｗ２はｂ糊、Ｌ
の時ａ′−に設足される。Ｓ５は。This results in a change of H9... Therefore, switch SW
The output of all of 1, that is, the signal S4 obtained from the capacitor C3 becomes the signal shown in FIG.
20 level v2 is held and capacitor C until time T3
It is kept at 1. On the other hand, switch SW5 is activated by S5.
When S5 is H', switch sw2 is B glue, L
It is added to a'- when . S5 is.

藁２図（ａｔに示すように１時点Ｔ　でＬ　時点Ｔ２で
”　Ｈ＃、時点Ｔ３でＰＬｌｌ　＋＋＋となり１時点Ｔ
、ではａ’［で、コンデ：１−ｙ−Ｃ２の１圧レベルを
スイッチＳＷ２かも出力させる。コンデンサＣ２の電圧
レベルはスイッチＳＷ、によって時点Ｔ１ａＥｒＪのレ
ベルＰ１の電圧ｖ、Ｋｋ待されており、この電圧？スイ
ッチＳＷ２が出力する。Figure 2 (as shown in at, L at time T2, "H#" at time T2, PLll +++ at time T3, and T at time 1)
, then a'[, the 1-pressure level of 1-y-C2 is also output from the switch SW2. The voltage level of the capacitor C2 is set to the voltage v, Kk of the level P1 at the time T1aErJ by the switch SW, and this voltage ? Switch SW2 outputs.

以上の動作から、スイッチＳＷ□はコンデンサＣ１およ
びＣ２ＫＳ１の信号レベルを保持させ、スイッチＳＷ２
はこり保持されたレベルを城り出す。From the above operation, switch SW□ maintains the signal level of capacitors C1 and C2KS1, and switch SW2
Break out of the level that is stuck.

この結果、ＳｌのＰＨｖ　Ｐ２　ｅ　Ｐ３・・・の各レ
ベルトＴの時間だけ遅らされることとなる。比較器１７
はスイッチＳＷ２の出力と８１の信号比較を行なう。Ｓ
２のｊＴのパルス輻が非常に小さけれは、Ｔの時間だけ
はなれた信号のレベル比４２を比較器１７で行な５こと
がでざる。As a result, the PHv P2 e P3 of Sl is delayed by the time of each level T. Comparator 17
compares the output of the switch SW2 with the signal 81. S
If the pulse intensity of jT of 2 is very small, it is impossible to calculate the level ratio 42 of the signals separated by the time T by the comparator 17.

気２図において時点Ｔ、のＰｌのレベルｖ１はＴ２直前
で知ることができ、このｖｌと時点Ｔ２のＳｌのＰ２の
レベル（Ｖ２）’に時点Ｔ２直罰のｊＴの時間で比軟さ
れろ。ｊＴが非常に小さければ、はぼ時点Ｔ２でのｖｌ
とＰ二（＝　Ｖ２）　’１’比較することができ、この
時Ｖ、とｐ；　（＝　Ｖ２　）のレベル差が大きい時、
第２図（ｇｌに示す判定パルスＳ７が発生する。In the Ki 2 diagram, the level v1 of Pl at time T can be known just before T2, and this vl and the level of P2 (V2)' of Sl at time T2 can be compared by the time jT of the direct penalty at time T2. . If jT is very small, then vl at time T2
and P2 (= V2) '1' can be compared, and in this case, when the level difference between V and p; (= V2) is large,
A determination pulse S7 shown in FIG. 2 (gl) is generated.

この動作は、第１凶の比較器１７とＳＷ３で行なわれろ
■即ちＳｌの１Ｍ牲とスイッチＳＷ２からの出力信号を
比較器１７で比較し、その出力を８２の信号が゛′ハ′
の時だけオンとなるスイッチ５Ｖｖ３を通し、ｊＴのＦ
ＲｆｆｊｊＫおける判定出力Ｓ７が得られるｏ　したが
って８７はＴだけ互いに時間のずれた二つの信号間レベ
ル差が大きい時はパルス性軸廿と判定し、′Ｈ′となり
、レベル差が小さい時は）くルス性楯音の混入のない　
Ｌとしてノ（ルス注雑音の検出７行なうことができる。This operation is performed by the first comparator 17 and SW3. In other words, the comparator 17 compares the 1M voltage of Sl and the output signal from the switch SW2, and the output from the comparator 82 is
Through the switch 5Vv3, which turns on only when
Judgment output S7 at RffjjK is obtained. Therefore, when the level difference between two signals that are time-shifted by T from each other is large, the 87 is judged to be a pulse axis, and becomes 'H', and when the level difference is small, it is No contamination of rusty shield sounds
Detection of noise can be performed as L.

寿２図に示すように、一つのパルス住銀音の九人により
Ｓ７が”Ｈ”となる判定パルスは二つ発生するが、この
パルスｌ’ｉｌＪ隔はＴとなる。この時間Ｔは、ビート
の最低局ｒＨＬ数１：　ｌＯｋＨｚとすれば、０．１ｒ
ｎｓであり、第１図の受信機ｌのゲート回路６における
幡を除去に必要なスイッチング＃関（約０．３〜０．５
ｍ５）より短い。したがって８７の信号はシュミツトド
リカ回路１１から底るスイッチングパルス発主回ｍＫよ
って０．３〜０．５　ｍ　ｓ　％度に広げられろ・この
状態を褐２図の（願、（ｈｌに示す。As shown in Fig. 2, two determination pulses in which S7 becomes "H" are generated by nine pulses of one pulse, and the interval between these pulses l'ilJ is T. This time T is 0.1 r, assuming the lowest beat rHL number 1: lOkHz.
ns, and the switching # coefficient (approximately 0.3 to 0.5
m5) shorter. Therefore, the signal at 87 is expanded by 0.3 to 0.5 m s % by the switching pulse generation time mK starting from the Schmidt-Dricker circuit 11. This state is shown in Fig. 2 (h1).

以上のよ５にビート信号が１大していても、パルス性幡
音が禎度よく見出されろ。As mentioned above, even if the beat signal is increased by 1, the pulse-like sound can be easily detected.

以上の夾り例においてはパルス性錐音の判定パルス８７
％ｒ′得るために第１図に示す比軟器とスイッチ５Ｗ３
Ｖ用いているが、比較器とスイッチを用いない方法も考
えられる・ 第２図１ｄＵ、　（１）のＳ４ｅ　　８６は、コンデン
？Ｃ１゜Ｃ２の端子信号である。雑音が人ってきている
場合１時点Ｔ３においてＳｓ　ＩＣＶ２のレベルかうＰ
３）７）レベルｖ１に恩直な信号変化が発生し、８６に
は時点Ｔ２においてｖｌからＰ；のレベルｖ２に急値な
信号変化が発生する。鑵廿が入力されなければこのよう
な信号変化は発生しない。したがってこのような急凍な
信号変化を微分回路で取り出し１台底すれは８７゛と等
価なｆＩ＆を判定倍号が祷られる。In the above example of contamination, the determination pulse 87 of the pulsed conical sound is
To obtain %r', the ratio softener and switch 5W3 shown in Fig. 1 are used.
Although V is used, there is also a method that does not use a comparator and switch. 1dU in Figure 2, S4e 86 in (1) is a capacitor? This is the terminal signal of C1°C2. When the noise is getting louder, the level of Ss ICV2 or P at time T3
3) 7) An obedient signal change occurs at level v1, and at time T2 at 86, a sudden signal change occurs from v1 to level v2 of P;. Such a signal change will not occur unless the signal is input. Therefore, it is desired to extract such rapid signal changes using a differentiating circuit and determine fI&, which is equivalent to 87 degrees when one unit bottoms out.

第３図はこの動作を行なう回路のブロック囚で。Figure 3 shows a block diagram of the circuit that performs this operation.

図中１８および１９は微分回路で、＠１図と共通する記
号は第１図におけろものと同じ部分を表わす。In the figure, 18 and 19 are differential circuits, and the symbols common to those in Figure 1 represent the same parts as in Figure 1.

すなわち第２図（ｆｌおよび（ｄＪに示す信号Ｓ６およ
び８４を微分回路それぞれ四および１８で部分する。That is, the signals S6 and 84 shown in FIG. 2 (fl and (dJ) are divided by differentiating circuits 4 and 18, respectively.

この出力を分層すると３５となり、スイッチングパルス
発生１路１１で、正および負の信号変化が入力さ九た時
Ｔよりも広いパルフッ発生させるようにすれは、第４図
（ａｌ、　（ｂ）にボすように、Ｓ；からＳ二めスイッ
チングパルスを作ることが、できる。If this output is divided into layers, it becomes 35, and in order to generate a pulse wider than T when positive and negative signal changes are input in the switching pulse generation path 11, it is shown in Fig. 4 (al, (b)). It is possible to create a second switching pulse of S from S; as shown in FIG.

Ｈ発明の効果 以上胱明した遡り１本元曲によ九は、遅延素子など尚価
な素子ン用いることなしに、ビート信号か九人しても小
さなパルス性−昔まで検出することができる。The effectiveness of the H invention has been clearly demonstrated by the ability to detect small pulses of beat signals even in the past, without using expensive elements such as delay elements. .

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

第１図は本発明によるパルス麹を慣出回路？言むＡＭ受
信機の構成を示すブロック図、第２図は累１図に示す回
路の中のいろいろな点における信号は形を示す因、第３
図は刊建パルス発生１ｇｊ路の１食形のブロック図、第
４図は第３図に示す回路の中のいろいろな点に２ける信
号成形？示す図、第５囚は従来のパルス鐘ｆ慣出回路馨
言むＡＭ欠信徴の檜成χ示すブロック図、第６図は改良
された従来のパルス維ｆ慣出都のブロック図である。 １°°・アンテナ、２・・・烏）８は増幅器、３・・・
混合回路、４・・・中間局は増幅器、５・・・恢匝器、
６・・・グー）Ｌ！２１路、７・・・ＩＦフィルタ、８
・・・増幅器、９・・・検阪器、ｌＯ・・・帯域通過フ
ィルタ、　１１・・・シュミットトリガ回路、１２・・
・遡延嵩子、１３・・・（２）形フィルタ、１４゛°′
クロンク発生溢、１５・・・フリップフロップ、１６・
・・反転器、１７・・・比軟−，１８，ｉ９・・・留分
Ｉ２Ｊ鮎。Is Fig. 1 a circuit for getting used to pulsed koji according to the present invention? Figure 2 is a block diagram showing the configuration of an AM receiver.
The figure is a block diagram of the single-meal form of the 1gj path for generating pulses, and Figure 4 shows the signal formation at various points in the circuit shown in Figure 3. Figure 5 is a block diagram showing a conventional pulse frequency output circuit, and Figure 6 is a block diagram of an improved conventional pulse frequency output circuit. . 1°°・Antenna, 2... Crow) 8 is an amplifier, 3...
Mixing circuit, 4... Intermediate station is an amplifier, 5... Converter,
6...Goo) L! 21 path, 7... IF filter, 8
...Amplifier, 9...Sound detector, IO...Band pass filter, 11...Schmitt trigger circuit, 12...
・Akako Rekinobu, 13...(2) type filter, 14゛°'
Cronk generation overflow, 15... flip-flop, 16.
... Inverter, 17... Specific soft-, 18, i9... Fraction I2J sweetfish.

Claims (3)

【特許請求の範囲】[Claims] （１）ＡＭ受信機においてＩＦ信号より局部発振信号を
除去し、パルス雑音成分を検波して、受信機のゲートを
制御するパルス雑音検出回路において、 （ａ）パルス雑音成分検波信号を保持する第１および第
２の保持手段、 （ｂ）該第１および第２の保持手段の入力を交互に切り
換える切換え手段、および （ｃ）交互に出力される上記保持手段の出力からパルス
雑音成分検波信号を検出し、パルス信号を発生する判定
手段、 を含むことを特徴とするＡＭ受信機のパルス雑音検出回
路。(1) In the pulse noise detection circuit that removes the local oscillation signal from the IF signal in the AM receiver, detects the pulse noise component, and controls the gate of the receiver, (a) a pulse noise detection circuit that holds the pulse noise component detected signal; (b) switching means for alternately switching the inputs of the first and second holding means; and (c) a pulse noise component detected signal from the alternately outputted outputs of the holding means. A pulse noise detection circuit for an AM receiver, comprising: determination means for detecting and generating a pulse signal. （２）上記判定手段が、 （ａ）上記第１および第２の保持手段の出力を切り換え
る切換え手段、 （ｂ）上記第１の保持手段の入力が接続されているとき
上記第２の保持手段の出力が接続され、上記第２の保持
手段の入力が後続されているとき上記第１の保持手段の
出力が接続されるように交互に上記入出力を制御する切
換え信号発生手段、および （ｃ）交互に出力される上記保持手段の出力信号と上記
パルス雑音成分検波信号によりパルス信号を発生する判
定パルス発生手段から成ることを特徴とする、特許請求
の範囲第１項記載のＡＭ受信機のパルス雑音検出回路。(2) The determination means includes: (a) switching means for switching the outputs of the first and second holding means; (b) when the input of the first holding means is connected, the second holding means; switching signal generating means for alternately controlling the input and output so that when the output of the first holding means is connected and the input of the second holding means is connected, the output of the first holding means is connected; ) The AM receiver according to claim 1, characterized in that the AM receiver comprises judgment pulse generating means for generating a pulse signal based on the output signal of the holding means and the pulse noise component detection signal which are outputted alternately. Pulse noise detection circuit. （３）上記判定手段が微分回路を含むことを特徴とする
、特許請求の範囲第１項記載のＡＭ受信機のパルス雑音
検出回路。(3) A pulse noise detection circuit for an AM receiver according to claim 1, wherein the determining means includes a differentiating circuit.