JPS628986B2 - - Google Patents
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- Publication number
- JPS628986B2 JPS628986B2 JP53090578A JP9057878A JPS628986B2 JP S628986 B2 JPS628986 B2 JP S628986B2 JP 53090578 A JP53090578 A JP 53090578A JP 9057878 A JP9057878 A JP 9057878A JP S628986 B2 JPS628986 B2 JP S628986B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- waveform
- 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
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- 230000005236 sound signal Effects 0.000 claims description 11
- 230000002194 synthesizing effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Landscapes
- Radio Relay Systems (AREA)
- Picture Signal Circuits (AREA)
- Details Of Television Systems (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】
本発明はテレビジヨン中断放送装置に関し、特
に自動ゴースト消去回路を具備したテレビジヨン
中断放送装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television interruption broadcasting device, and more particularly to a television interruption broadcasting device equipped with an automatic ghost cancellation circuit.
自動ゴースト消去回路を具備したテレビジヨン
中断放送装置として、特願昭53−62679号「自動
波形等化装置」の出願明細書に示されている装置
があり、この一部分を今第１図に示して説明す
る。第１図において中間周波数信号入力端子１か
らの信号は映像音声分離回路２で音声信号成分と
映像信号成分とに分離される。映像信号成分は復
調回路３で復調され復調信号はトランスバーサル
波形等化器４に入り、制御回路５の制御によりゴ
ーストが消去されて変調回路６に送られる。分離
回路２からの音声信号成分と変調回路６からの映
像信号成分とは合成回路７で合成され、端子８を
経て周波数変換回路、電力増幅器へと送られる。
さて第１図においてゴースト消去動作を中心に説
明すると、トランスバーサル波形等化器４及び制
御回路５の動作については例えば前述の特願昭53
−62679号や公開特許公報特開昭52−15247号に説
明されている。即ちトランスバーサル等化器４の
出力信号の一部は制御部５に参照信号として供給
〓〓〓〓
される。制御回路５では該参照信号の波形と制御
回路５に記憶されている基準信号の波形とを比較
して誤差信号を得る。該誤差信号を所定のアルゴ
リズムに従つて処理をして制御信号を得る。該制
御信号によりトランスバーサル波形等器４を制御
し波形等化（ゴースト自動消去）を行なう。 As a television interruption broadcasting device equipped with an automatic ghost canceling circuit, there is a device shown in the application specification of Japanese Patent Application No. 53-62679 ``Automatic Waveform Equalization Device'', a part of which is shown in FIG. I will explain. In FIG. 1, a signal from an intermediate frequency signal input terminal 1 is separated by a video/audio separation circuit 2 into an audio signal component and a video signal component. The video signal component is demodulated by a demodulation circuit 3, the demodulated signal enters a transversal waveform equalizer 4, ghosts are eliminated under the control of a control circuit 5, and the demodulated signal is sent to a modulation circuit 6. The audio signal component from the separation circuit 2 and the video signal component from the modulation circuit 6 are combined in a synthesis circuit 7 and sent via a terminal 8 to a frequency conversion circuit and a power amplifier.
Now, to explain the ghost elimination operation in FIG.
-62679 and JP-A-52-15247. That is, a part of the output signal of the transversal equalizer 4 is supplied to the control section 5 as a reference signal.
be done. The control circuit 5 compares the waveform of the reference signal with the waveform of the reference signal stored in the control circuit 5 to obtain an error signal. The error signal is processed according to a predetermined algorithm to obtain a control signal. The control signal controls the transversal waveform equalizer 4 to perform waveform equalization (automatic ghost cancellation).
テレビジヨン放送システムにおいてはテレビジ
ヨン放送機にて受信イコライザーと呼ばれる群遅
延時間特性補償回路により群遅延時間特性のプリ
テイストーシヨンを行なつている。即ちテレビ受
像機では映像信号を復調する際に映像信号と音声
信号とで生ずる混変調歪の影響を避ける為に音声
信号レベルを抑圧すべく音声搬送周波数のトラツ
プフイルターを使用しており、該トラツプフイル
ターにより生ずる映像信号帯域内の群遅延時間歪
をテレビジヨン放送機側で補償すべくブリデイス
トーシヨンを行なつている。従つてテレビ中断放
送機からの送信信号においても同様にプリデイス
トーシヨンを行なつた信号でなければならない。
第１図に示す従来の自動ゴースト消去装置では制
御回路５に供給される参照信号はトランスバーサ
ル波形等化器４の出力信号の一部であるので、ト
ランスバーサル波形等化器４の出力信号波形が理
想的には親局であるテレビ放送所でテレビ放送機
に加えられるビデオ波形と同一となる様に等化さ
れる。従つて映像変調器６が前記受信イコライザ
ー回路をもつ必要がある。又映像変調器６はその
出力信号を残留側波帯方式の信号にするためのフ
イルター（VSBF）を有している為、該VSBFに
より生ずる群遅延時間歪の補償も必要である。上
記の如く第１図に示す従来のテレビジヨン中断放
送装置に於ては要求される性能に合致される為に
映像変調器６が種々の群遅延時間特性補償回路を
具させねばならず装置が高価となる欠点がある。
更に、映像変調器６よりも出力側に位置する各回
路の特性変化により生ずる波形歪は補償されない
という欠点がある。 In a television broadcasting system, a group delay time characteristic compensation circuit called a reception equalizer performs pre-tortion of group delay time characteristics in a television broadcasting machine. In other words, when demodulating a video signal, a television receiver uses an audio carrier frequency trap filter to suppress the audio signal level in order to avoid the effects of cross-modulation distortion that occurs between the video signal and audio signal. In order to compensate for the group delay time distortion within the video signal band caused by the trap filter, the television broadcaster performs bridistortion. Therefore, the signal transmitted from the television interrupt broadcaster must be similarly predistorted.
In the conventional automatic ghost canceling device shown in FIG. 1, since the reference signal supplied to the control circuit 5 is a part of the output signal of the transversal waveform equalizer 4, is ideally equalized so that it is the same as the video waveform applied to a television broadcaster at a television broadcasting station, which is a parent station. Therefore, it is necessary for the video modulator 6 to include the reception equalizer circuit. Furthermore, since the video modulator 6 has a filter (VSBF) for converting its output signal into a vestigial sideband type signal, it is also necessary to compensate for group delay time distortion caused by the VSBF. As mentioned above, in the conventional television interrupted broadcasting system shown in FIG. 1, in order to meet the required performance, the video modulator 6 must be equipped with various group delay time characteristic compensation circuits. It has the disadvantage of being expensive.
Furthermore, there is a drawback that waveform distortion caused by changes in characteristics of each circuit located on the output side of the video modulator 6 is not compensated for.
したがつて、本発明の目的は、変調回路に各種
補償回路を挿入する必要がない新規なテレビジヨ
ン中断放送装置を提供することである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel television interruption broadcasting device that does not require insertion of various compensation circuits into the modulation circuit.
本発明によれば、入力テレビジヨン信号を中間
周波数帯域に変換する第一の変換手段と、第一の
変換手段の出力を音声信号成分と映像信号成分と
に分離する音声映像分離手段と、前記音声映像分
離手段からの映像信号成分を入力し復調する第一
の復調手段と、前記第一の復調手段の出力を受け
波形等化をするトランスバーサル波形等化器と、
前記波形等化器の出力を変調する変調手段と、前
記変調手段の出力と前記音声映像分離手段からの
音声信号成分とを合成する合成回路と、前記合成
回路の出力を送信周波数帯域に変換する第二の変
換手段と、第二の変換手段の出力を電力増幅する
電力増幅器と、前記電力増幅器の出力が供給せら
れる出力フイルタと、前記出力フイルタの出力を
空中線へ導く手段と、前記フイルタ手段の出力の
一部受け映像信号に復調する音声トラツプを含む
第二の復調手段と第二の復調手段からの映像信号
を受けこの映像信号の中の所定波形とあらかじめ
記憶されている波形とを比較しその比較結果によ
り前記トランスバーサル波形等化器を制御する制
御手段とを具備することを特徴とするテレビジヨ
ン中断放送装置が得られる。 According to the present invention, there is provided a first converting means for converting an input television signal into an intermediate frequency band, an audio-video separating means for separating an output of the first converting means into an audio signal component and a video signal component; a first demodulation means that inputs and demodulates the video signal component from the audio-video separation means; a transversal waveform equalizer that receives the output of the first demodulation means and equalizes the waveform;
a modulating means for modulating the output of the waveform equalizer; a synthesizing circuit for synthesizing the output of the modulating means and the audio signal component from the audio-video separating means; and converting the output of the synthesizing circuit into a transmission frequency band. a second conversion means, a power amplifier for power amplifying the output of the second conversion means, an output filter to which the output of the power amplifier is supplied, means for guiding the output of the output filter to the antenna, and the filter means. a second demodulating means including an audio trap that receives a portion of the output of the video signal and demodulates it into a video signal; and a second demodulating means that receives a video signal from the second demodulating means and compares a predetermined waveform in the video signal with a pre-stored waveform. According to the comparison result, a television interruption broadcasting apparatus is obtained, which is characterized in that it comprises a control means for controlling the transversal waveform equalizer.
次に本発明の一実施例を示した図面を参照して
本発明を詳細に説明する。第２図は本発明の一実
施例を示した図であり、第２図において、受信空
中線９で受信した信号は入力フイルタ１０を経て
周波数変換器１１で中間周波数に変換され、音声
映像分離回路１２で音声信号成分と映像信号成分
とにそれぞれ分離される。映像信号成分は復調器
１３で復調されトランスバーサル波形等化器１４
を経たあと変調器１５で再び変調される。変調器
１５の出力と音声映像分離回路からの音声信号成
分とは合成回路１６で合成され、周波数変換器１
７で送信周波数帯域に変換されたあと電力増幅器
１８で電力増幅される。電力増幅器１８の出力は
出力フイルタ１９、方向性結合器２０を経て空中
線２１へ供給される。方向性結合器２０で取り出
された出力の一部は復調器２２で復調される。復
調器２２は当然音声トラツプを有しており、映像
信号は制御回路へ供給する。制御回路２３では、
復調器２２からの映像信号の中の所定の波形とあ
らかじめ記憶されている波形とを比較し、その比
較結果に応じて、トランスバーサル波形等化器を
制御しゴーストや波形歪を消去する。 Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention. FIG. 2 is a diagram showing an embodiment of the present invention. In FIG. 2, a signal received by a receiving antenna 9 is converted to an intermediate frequency by a frequency converter 11 through an input filter 10, and is then converted to an intermediate frequency by a frequency converter 11. 12, the signal is separated into an audio signal component and a video signal component. The video signal component is demodulated by a demodulator 13 and transmitted to a transversal waveform equalizer 14.
After that, the signal is modulated again by the modulator 15. The output of the modulator 15 and the audio signal component from the audio/video separation circuit are synthesized by a synthesis circuit 16, and the frequency converter 1
After being converted into a transmission frequency band at step 7, the power is amplified at power amplifier 18. The output of the power amplifier 18 is supplied to an antenna 21 via an output filter 19 and a directional coupler 20. A part of the output extracted by the directional coupler 20 is demodulated by the demodulator 22. The demodulator 22 naturally has an audio trap and supplies the video signal to the control circuit. In the control circuit 23,
A predetermined waveform in the video signal from the demodulator 22 is compared with a pre-stored waveform, and depending on the comparison result, a transversal waveform equalizer is controlled to eliminate ghosts and waveform distortion.
第２図の構成で、復調器２２は標準のテレビジ
ヨン受信機に用いられる復調器であり、音声信号
除去の為の音声トラツプを有しているので、映像
帯域内群遅延時間特性は標準テレビジヨン受像機
〓〓〓〓
の特性、即ち電波法で定められたテレビジヨン放
送機における映像信号の群遅延時間特性の逆特性
をもつことになる。この逆特性を有する復調器２
２の出力を制御回路２３へ供給することにより、
従来変調器１５に設けられていたプリデイストー
シヨンをつけるための受信イコライザーが不要と
なる。更に変調器１５に含まれるVSBFや出力フ
イルター１９によつて生ずる群遅延時間歪の補償
回路も不要となることは明らかである。第２図に
示した構成において、更に有利な点は復調器２
２、制御器２３、トランスバーサル波形等化器１
４を除いた他の構成要素つまり、変調器１５、合
成回路１６、周波数変換回路１７、電力増幅器１
８等で生じる波形歪も自動的に補償することがで
きることである。 In the configuration shown in Fig. 2, the demodulator 22 is a demodulator used in a standard television receiver, and has an audio trap for removing audio signals, so the group delay time characteristic in the video band is the same as that of a standard television receiver. Jiyoung receiver〓〓〓〓
In other words, it has a characteristic that is the inverse of the group delay time characteristic of a video signal in a television broadcasting device specified by the Radio Law. Demodulator 2 with this inverse characteristic
By supplying the output of 2 to the control circuit 23,
A reception equalizer for adding predistortion, which was conventionally provided in the modulator 15, becomes unnecessary. Furthermore, it is clear that a compensation circuit for group delay time distortion caused by the VSBF and the output filter 19 included in the modulator 15 is also unnecessary. In the configuration shown in FIG. 2, a further advantage is that the demodulator 2
2, controller 23, transversal waveform equalizer 1
Other components except 4, namely, modulator 15, synthesis circuit 16, frequency conversion circuit 17, power amplifier 1
It is also possible to automatically compensate for waveform distortion caused by 8 etc.
さて、第２図において、復調器２２は標準のテ
レビジヨン受信機に用いられる復調器である。つ
まり残留側波帯方式に適したナイキスト特性をも
つ復調器である。そのため復調器２２においては
検波の前までに、映像搬送波周波数の点で相対利
得が0.5となる帯域特性を作つてやる必要があ
り、そのためのフイルタ回路を具備し、更にその
フイルタをもつ群遅延時間特性を補償する補償回
路をも具備させねばならなかつた。これは一般に
制御回路２３に記憶されている基準波形信号は親
局のテレビジヨン放送機に加えられる参照波形と
同一とされているからである。第２図における復
調器２２に極めて簡単な復調回路、すなわちフイ
ルタ回路や補償回路を具備しない両側波帯方式復
調回路を用いることができれば非常に回路構成が
簡単になる。 Now, in FIG. 2, demodulator 22 is a demodulator used in standard television receivers. In other words, it is a demodulator with Nyquist characteristics suitable for the vestigial sideband method. Therefore, in the demodulator 22, it is necessary to create a band characteristic with a relative gain of 0.5 in terms of the video carrier frequency before detection, and a filter circuit for this purpose is provided, and the group delay time of the filter is also required. It was also necessary to include a compensation circuit to compensate for the characteristics. This is because the reference waveform signal stored in the control circuit 23 is generally the same as the reference waveform applied to the television broadcasting device of the parent station. If a very simple demodulation circuit, that is, a double-sided band type demodulation circuit that does not include a filter circuit or a compensation circuit, can be used for the demodulator 22 in FIG. 2, the circuit configuration will be extremely simple.
制御回路２３で用いられる参照波形信号として
VITSの中の2Tパルスを用いた場合を例にとり説
明してゆく。第３図は標準のテレビジヨン受信機
に用いられる復調器の特性を示す図であり、ａは
検波出力特性図、ｂはこの復調器で復調して得ら
れる2Tパルスを示す図である。そしてこのよう
な復調器を用いる場合には第３図ｂのような2T
パルス波形が基準波形信号として制御回路２３に
前もつて記憶されることはもちろんである。第４
図は前述した、フイルタ回路や補償回路を具備し
ない簡単な両側波帯方式復調回路の特性を示す図
でありａは検波出力特性図、ｂはこの復調回路で
復調して得られる2Tパルスを示す図である。し
たがつて、制御回路２３の中にあらかじめ記憶さ
れている基準波形信号として第４図ｂに示す波形
を用いれば、復調器２２には構成が簡単な両側波
帯方式の復調回路が利用できることは明らかであ
る。このようにすれば、復調器からの検波出力
（参照波形）が第４図ｂに示す波形に近づく様に
波形等化が行なわれる。このとき、テレビジヨン
中継方送装置の出力においては、その出力が残留
側波帯方式に適したナイキスト特性をもつ復調器
で復調された場合VITSの中の2Tパルスが第３図
ｂの波形に近づくように波形等化が行なわれてお
り、ゴースト消去及び波形歪が等化される。参照
波形としてVITSの中の2Tパルスを用いた場合を
説明したが、2Tバーを用いた場合にも応用でき
ることはもちちろんである。 As a reference waveform signal used in the control circuit 23
This will be explained using the 2T pulse in VITS as an example. FIG. 3 is a diagram showing the characteristics of a demodulator used in a standard television receiver, where a is a detection output characteristic diagram and b is a diagram showing the 2T pulse obtained by demodulating with this demodulator. When using such a demodulator, 2T as shown in Figure 3b
Of course, the pulse waveform is previously stored in the control circuit 23 as a reference waveform signal. Fourth
The figure shows the characteristics of the simple double-sideband demodulation circuit that does not include a filter circuit or compensation circuit, as described above. A shows the detection output characteristics, and b shows the 2T pulse obtained by demodulating with this demodulation circuit. It is a diagram. Therefore, if the waveform shown in FIG. 4b is used as the reference waveform signal stored in advance in the control circuit 23, it is possible to use a double-sided band type demodulation circuit with a simple configuration in the demodulator 22. it is obvious. In this way, waveform equalization is performed so that the detected output (reference waveform) from the demodulator approaches the waveform shown in FIG. 4b. At this time, in the output of the television relay transmitter, if the output is demodulated by a demodulator with Nyquist characteristics suitable for the vestigial sideband method, the 2T pulse in VITS will have the waveform shown in Figure 3b. Waveform equalization is performed to approximate the ghost, eliminating ghosts and equalizing waveform distortion. Although we have explained the case where the 2T pulse in VITS is used as the reference waveform, it goes without saying that it can also be applied to the case where a 2T bar is used.
以上詳細に説明したように、本発明によれば、
空中線へ供給される送信出力の一部を通常の受信
機で使用される復調器で復調して得られる映像信
号をトランバーサル波形等化器の制御回路へ参照
信号として供給することによつて、映像信号の受
信イコライザー及びVSBF、出力フイルタにより
生ずる波形歪の補償回路を不要とするテレビジン
中継放送装置が得られる。更に送信出力の一部を
復調して制御回路へ送る復調器に両側波帯方式の
簡単な復調回路を使用し、制御回路に記憶される
基準波形を復調器の特性を考慮してあらかじめ変
更しておけばより構成の簡単なテレビジヨン中継
放送装置が得られる。 As explained in detail above, according to the present invention,
By demodulating a part of the transmission output supplied to the antenna with a demodulator used in a normal receiver and supplying the video signal obtained as a reference signal to the control circuit of the transversal waveform equalizer, A television broadcasting relay broadcasting device that does not require a video signal reception equalizer, VSBF, and a compensation circuit for waveform distortion caused by an output filter can be obtained. Furthermore, a simple double-side band type demodulation circuit is used for the demodulator that demodulates a portion of the transmitted output and sends it to the control circuit, and the reference waveform stored in the control circuit is changed in advance by taking into account the characteristics of the demodulator. By doing so, a television relay broadcasting device with a simpler configuration can be obtained.
第１図は従来のテレビジヨン中継放送装置の一
部分を示す図、第２図は本発明の一実施例を示す
図、第３図は標準のテレビジヨン受信機に用いら
れる復調器の特性を示す図で、ａは検波出力特性
図、ｂはこの復調器で復調して得られる2Tパル
スを示す図、第４図は両側波帯方式復調器の特性
を示す図で、ａは検波出力特性図、ｂはこの復調
器で復調して得られる2Tパルスを示す図。
図において、２，１２……音声映像分離回路、
３，１３，２２……復調器、４，１４……トラン
スバーサル波形等化器、５，２３……制御回路、
６，１５……変調器、７，１６……合成回路、９
……受信用空中線、１０……入力フイルタ、１
１，１７……周波数変換器、１８……電力増幅
器、１９……出力フイルタ、２０……方向性結合
〓〓〓〓
回路、２１……送信用空中線。
〓〓〓〓
Fig. 1 is a diagram showing a part of a conventional television relay broadcasting device, Fig. 2 is a diagram showing an embodiment of the present invention, and Fig. 3 is a diagram showing characteristics of a demodulator used in a standard television receiver. In the figure, a is a detection output characteristic diagram, b is a diagram showing the 2T pulse obtained by demodulating with this demodulator, FIG. 4 is a diagram showing the characteristics of the double-sided band demodulator, and a is a detection output characteristic diagram. , b are diagrams showing 2T pulses obtained by demodulating with this demodulator. In the figure, 2, 12... audio video separation circuit,
3, 13, 22... Demodulator, 4, 14... Transversal waveform equalizer, 5, 23... Control circuit,
6, 15...Modulator, 7, 16...Synthesizing circuit, 9
...Receiving antenna, 10...Input filter, 1
1, 17... Frequency converter, 18... Power amplifier, 19... Output filter, 20... Directional coupling〓〓〓〓
Circuit, 21... Transmission antenna. 〓〓〓〓
Claims (1)
する第一の変換手段と、第一の変換手段の出力を
音声信号成分と映像信号成分とに分離する音声映
像分離手段と、前記音声映像分離手段からの映像
信号成分を入力し復調する第一の復調手段と、前
記第一の復調手段の出力を受け波形等化をするト
ランスバーサル波形等化器と、前記波形等化器の
出力を変調する変調手段と、前記変調手段の出力
と前記音声映像分離手段からの音声信号成分とを
合成する合成回路と、前記合成回路の出力を送信
周波数帯域に変換する第二の変換手段と、第二の
変換手段の出力を電力増幅する電力増幅器と、前
記電力増幅器の出力が供給せられる出力フイルタ
と、前記フイルタの出力を空中線へ導く手段と、
前記合成回路以後から信号を取り出し映像信号に
復調する音声トラツプを含む第二の復調手段と、
第二の復調手段からの映像信号を受けこの映像信
号の中の所定波形とあらかじめ記憶されている波
形とを比較しその比較結果により前記トランスバ
ーサル波形等化器を制御する制御手段とを具備す
ることを特徴とするテレビジヨン中断放送装置。1 a first converting means for converting an input television signal into an intermediate frequency band; an audio-visual separating means for separating the output of the first converting means into an audio signal component and a video signal component; a transversal waveform equalizer that receives and equalizes the waveform of the output of the first demodulation means; and a modulator that modulates the output of the waveform equalizer. means, a synthesizing circuit for synthesizing the output of the modulating means and the audio signal component from the audio-video separating means, a second converting means for converting the output of the synthesizing circuit into a transmission frequency band, and a second converting means. a power amplifier for power amplifying the output of the means; an output filter to which the output of the power amplifier is supplied; and means for guiding the output of the filter to an antenna;
a second demodulation means including an audio trap that extracts a signal from the synthesis circuit and demodulates it into a video signal;
control means for receiving the video signal from the second demodulation means, comparing a predetermined waveform in the video signal with a pre-stored waveform, and controlling the transversal waveform equalizer based on the comparison result. A television interruption broadcasting device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9057878A JPS5516590A (en) | 1978-07-21 | 1978-07-21 | Television relay broadcasting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9057878A JPS5516590A (en) | 1978-07-21 | 1978-07-21 | Television relay broadcasting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5516590A JPS5516590A (en) | 1980-02-05 |
| JPS628986B2 true JPS628986B2 (en) | 1987-02-25 |
Family
ID=14002307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9057878A Granted JPS5516590A (en) | 1978-07-21 | 1978-07-21 | Television relay broadcasting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5516590A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021633A (en) * | 1983-07-18 | 1985-02-04 | Akiyufueezu Kk | Reception circuit |
| GB8520662D0 (en) * | 1985-08-17 | 1985-09-25 | Wellcome Found | Tricyclic aromatic compounds |
-
1978
- 1978-07-21 JP JP9057878A patent/JPS5516590A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5516590A (en) | 1980-02-05 |
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