JPS6284632A - Signal multiplexer - Google Patents

Signal multiplexer

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Publication number
JPS6284632A
JPS6284632A JP22512285A JP22512285A JPS6284632A JP S6284632 A JPS6284632 A JP S6284632A JP 22512285 A JP22512285 A JP 22512285A JP 22512285 A JP22512285 A JP 22512285A JP S6284632 A JPS6284632 A JP S6284632A
Authority
JP
Japan
Prior art keywords
signal
sub
phase
video signal
carrier
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.)
Granted
Application number
JP22512285A
Other languages
Japanese (ja)
Other versions
JPH0648806B2 (en
Inventor
Hitoshi Takai
均 高井
Tetsuaki Morotomi
諸冨 哲明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP22512285A priority Critical patent/JPH0648806B2/en
Publication of JPS6284632A publication Critical patent/JPS6284632A/en
Publication of JPH0648806B2 publication Critical patent/JPH0648806B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To improve spectrum utilization efficiency and to perform signal multiplexing with simple constitution by multiplexing a subordinate signal on an axis perpendicular to the modulation axis of a video signal throughout a horizontal or vertical blanking section or for part of the section. CONSTITUTION:A carrier inputted from a carrier input terminal is divided into two sequences by a transmission system 20, and one sequence is shifted in phase by 90 deg. through a 90 deg. phase shifter 4. Then, a reception system 21 has a PLL composed of a balanced modulator 14, a subordinate signal filter 13, a loop filter 16, and a VCO 15, and the carrier is regenerated. The carrier of the video signal is not suppressed, so the regenerated carrier is 90 deg. out of phase with a video signal demodulation axis, i.e. locked to the phase of the demodulation axis of the subordinate signal. The subordinate signal is demodulated by the balanced modulator 14. This regenerated carrier is shifted in phase by -90 deg. through a -90 deg. phase shifter and then in phase with the demodulation axis of the video signal, so synchronous detection is carried out by a balanced modulator 10 to demodulate the video signal.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、残留側波帯伝送方式を採用するテレビ信号伝
送において、副信号を多重する信号多重装置に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal multiplexing device for multiplexing sub-signals in television signal transmission employing a vestigial sideband transmission method.

従来の技術 近年、テレビ信号に各種の信号を多重し、より高度なサ
ービスを行うことが盛んになってきた。
2. Description of the Related Art In recent years, it has become popular to multiplex various signals onto television signals to provide more advanced services.

文字多重放送がその一例として挙げられるが、一般に都
市型CATVにおいては、テレビ信号にスクランブル関
係などの各種の信号を多重する必要がある。
Teletext broadcasting is one example, but in urban CATV, it is generally necessary to multiplex various signals, such as scramble-related signals, onto the television signal.

従来からの信号多重装置には、大別して2種のものがあ
る。同期信号区間に情報を多重する文字多重放送などの
時間多重方式、あるいは音声多重放送などで広く用いら
れているような周波数多重方式がある。
Conventional signal multiplexing devices can be broadly classified into two types. There are time multiplexing systems, such as teletext multiplexing, in which information is multiplexed in synchronized signal sections, and frequency multiplexing systems, such as those widely used in audio multiplexing broadcasting.

以下図面を参照しながら、このような従来の信号多重装
置の一例として、文字多重放送の信号多重装置について
説明する。
A signal multiplexing device for teletext broadcasting will be described below as an example of such a conventional signal multiplexing device with reference to the drawings.

第3図は、文字多重放送の信号多重装置の構成図を示し
たものである。51は映像信号入力端子、52は文字信
号重畳器、53は波形整形フィルタ、54は文字信号(
副信号)入力端子、55は搬送波入力端子、56は振幅
変調器、57は残留側波帯フィルタで、以上により送信
系514が構成されている。58は伝送路である。また
、59は検波器、510は映像信号出力端子、511は
同期分離回路、512は文字信号抜取り回路、513は
文字信号(副信号)出力端子で、以上により受信系51
5が構成されている。
FIG. 3 shows a block diagram of a signal multiplexing device for teletext broadcasting. 51 is a video signal input terminal, 52 is a character signal superimposer, 53 is a waveform shaping filter, and 54 is a character signal (
55 is a carrier wave input terminal, 56 is an amplitude modulator, and 57 is a vestigial sideband filter, which constitutes a transmission system 514. 58 is a transmission line. Further, 59 is a detector, 510 is a video signal output terminal, 511 is a synchronization separation circuit, 512 is a character signal sampling circuit, and 513 is a character signal (sub signal) output terminal.
5 are configured.

以上のように構成された信号多重装置について、以下第
3図を用いてその動作につい”ζ簡単に説明する。
The operation of the signal multiplexing device configured as described above will be briefly explained below with reference to FIG.

送信系514において、副信号としての文字信号は、文
字信号重畳器52によって、垂直帰線区間にバースト的
に多重される。一方、受信系515では検出器59で検
波後、同期分離回路511で同期信号が分離され、この
同期信号をもとに文字信号抜取り回路512で副信号が
分離される。(例えば、[放送技術JVo1.36No
、10  pp105〜111) 一方、周波数多重を行う信号多重装置には、大別して2
つに分けられる。1つはテレビ信号のチャンネル内のス
ペクトルの隙間に信号を多重する方式であり、もう1つ
はテレビ信号のチャンネル外に信号を多重する方式であ
る。前者には、音声多重放送や多重ファクシミリが含ま
れる。後者には、CATVで良く用いられているように
、テレビ信号帯域とは別にデータ伝送用帯域を設けてい
る場合がこれに当る。
In the transmission system 514, a character signal as a sub-signal is multiplexed in a burst manner in a vertical retrace interval by a character signal superimposer 52. On the other hand, in the receiving system 515, after detection by a detector 59, a synchronization signal is separated by a synchronization separation circuit 511, and a sub-signal is separated by a character signal extraction circuit 512 based on this synchronization signal. (For example, [Broadcasting Technology JVo1.36No.
, 10 pp. 105-111) On the other hand, signal multiplexing devices that perform frequency multiplexing can be roughly divided into two types.
It can be divided into One is a method in which signals are multiplexed into gaps in the spectrum within the television signal channel, and the other is a method in which signals are multiplexed outside the television signal channel. The former includes audio multiplex broadcasting and multiplex facsimile. The latter case corresponds to a case where a data transmission band is provided separately from the television signal band, as is often used in CATV.

発明が解決しようとする問題点 しかしながら上記のような従来の構成では、いずれも構
成が複雑(とくに復調系)な上、テレビ信号のチャンネ
ル外に信号を周波数多重する場合、スペクトル利用効率
の点でも好ましくない。
Problems to be Solved by the Invention However, with the conventional configurations described above, the configurations are complex (especially the demodulation system), and when signals are frequency multiplexed outside the TV signal channel, it is difficult to use the spectrum in terms of efficiency. Undesirable.

本発明は上記問題点に鑑み、構成が簡易で、スペクトル
利用効率が良く、副信号を多重する信号多重装置を提供
するものである。
In view of the above problems, the present invention provides a signal multiplexing device that has a simple configuration, has good spectrum utilization efficiency, and multiplexes sub-signals.

問題点を解決するための手段 上記問題点を解決するために、本発明の信号多重装置は
、映像信号に対する振幅変調器と、搬送波を90°移和
する90”移相器と、副信号に対する帯域制限フィルタ
と、該帯域制限フィルタを通過した副信号で、映像信号
用搬送波とは90”位相の異なる搬送波を振幅変調する
平衡変調器と、該振幅変調器と該平衡変調器の出力信号
を合成する合波器と、該合波器の出力信号の側波帯の一
部を削り取る残留側波帯フィルタを備えたものである。
Means for Solving the Problems In order to solve the above problems, the signal multiplexing device of the present invention includes an amplitude modulator for the video signal, a 90" phase shifter for shifting the carrier wave by 90 degrees, and a 90" phase shifter for shifting the carrier wave by 90 degrees. a band-limiting filter; a balanced modulator that amplitude-modulates a sub-signal that has passed through the band-limiting filter and whose phase is 90" different from that of the video signal carrier; and an output signal of the amplitude modulator and the balanced modulator. It is equipped with a multiplexer for combining and a residual sideband filter for removing part of the sideband of the output signal of the multiplexer.

作用 本発明は上記した構成によって、映像信号の変調軸とは
直交する軸に副信号を多重するので、占有スペクトルを
増加させることがなく、スペクトル利用効率の良い信号
多重が可能になる。また、同期検波を用いることにより
、信号の分離が容易に行なえるので、とりわけ復調系に
おいて、構成が簡易になる。
Effect: With the above-described configuration, the present invention multiplexes sub-signals on an axis orthogonal to the modulation axis of the video signal, thereby enabling signal multiplexing with high spectrum utilization efficiency without increasing the occupied spectrum. Furthermore, by using synchronous detection, signals can be easily separated, which simplifies the configuration, especially in the demodulation system.

実施例 以、下本発明の一実施例の信号多重装置について、図面
を参照しながら説明する。
Embodiment Hereinafter, a signal multiplexing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

第1図は本発明の第1の実施例における信号多重装置の
回路構成図を示すものである。第1図において、1は搬
送波入力端子、2は振幅変調器、3は映像信号入力端子
、4は90’移相器、5は平衡変調器、6は副信号入力
端子、7は合波器、8は残留側波帯フィルタ、19は副
信号帯域制限フィルタで、以上により送信系20が構成
されている。9は伝送路である。また、10と14は平
衡変調器、11は−90”移相器、12は映像信号用フ
ィルタ、13は副信号用フィルタ、15はVCO(電圧
制御発振器)、16はループフィルタ、17は映像信号
出力端子、 18は副信号出力端子で、以上により受信系21が構成
されている。
FIG. 1 shows a circuit diagram of a signal multiplexing device according to a first embodiment of the present invention. In Fig. 1, 1 is a carrier input terminal, 2 is an amplitude modulator, 3 is a video signal input terminal, 4 is a 90' phase shifter, 5 is a balanced modulator, 6 is a sub-signal input terminal, and 7 is a multiplexer. , 8 is a vestigial sideband filter, 19 is a sub-signal band limiting filter, and the transmission system 20 is constituted by the above. 9 is a transmission path. Further, 10 and 14 are balanced modulators, 11 is a -90" phase shifter, 12 is a video signal filter, 13 is a sub-signal filter, 15 is a VCO (voltage controlled oscillator), 16 is a loop filter, and 17 is a video signal filter. A signal output terminal 18 is a sub-signal output terminal, and the reception system 21 is configured as described above.

以上のように構成された信号多重装置について、以下第
1図を用いてその動作を説明する。
The operation of the signal multiplexing device configured as described above will be explained below using FIG. 1.

まず、送信系20において、搬送波入力端子1から入力
された搬送波は、まず、2系統に分けられ、一方は90
°移相器4によって、90”位相がずらされる。直交す
る2つの搬送波は、映像信号、副信号により、各々振幅
変調器2および平衡変調器5で振幅変調を受け、合波器
7によって合成される。このように直交変調を受けた波
は、残留側波帯フィルタ8によって側波帯の一部が削り
取られ伝送される。なお、副信号帯域制限フィルタ19
によって、副信号の帯域が制限される。
First, in the transmission system 20, the carrier wave input from the carrier wave input terminal 1 is first divided into two systems, one of which has 90
The two orthogonal carrier waves are amplitude-modulated by the video signal and the sub-signal by the amplitude modulator 2 and the balanced modulator 5, and then combined by the multiplexer 7. The wave that has undergone orthogonal modulation in this way is transmitted with a part of the sideband removed by the vestigial sideband filter 8.
This limits the sub-signal band.

次に、受信系21において、平衡変調器14、副信号用
フィルタ13、ループフィルタ16、VCO15によっ
てPLLが構成されており、搬送波が再生される。映像
信号の搬送波は抑圧されないので、再生搬送波の位相は
、映像信号復調軸とは90°ずれた所、つまり、副信号
の復調軸の位相にロックされる。平衡変調器14により
、この再生搬送波で同期検波を行えば、副信号が復調さ
れる。この再生搬送波を−90”移相器11により一9
0’移相すれば、映像信号復調軸となるので、平衡変調
器10により同期検波することにより、映像信号が復調
される。なお、搬送波の再、生は、映像信号搬送波の位
相に基づき固定されるので、副信号に差動符号化を行う
必要はない。また、ループフィルタ16はVCO15に
供給される制御信号中の副信号の成分を除去し、再生搬
送波の位相ジッタを低減する働きをする。
Next, in the receiving system 21, a PLL is configured by a balanced modulator 14, a sub-signal filter 13, a loop filter 16, and a VCO 15, and the carrier wave is regenerated. Since the carrier wave of the video signal is not suppressed, the phase of the reproduced carrier wave is locked to a position shifted by 90 degrees from the video signal demodulation axis, that is, to the phase of the sub-signal demodulation axis. When the balanced modulator 14 performs synchronous detection using this regenerated carrier wave, the sub signal is demodulated. This regenerated carrier wave is transferred to -90" by a -90" phase shifter 11.
If the phase is shifted by 0', it becomes the video signal demodulation axis, so the video signal is demodulated by synchronous detection by the balanced modulator 10. Note that since the reproduction of the carrier wave is fixed based on the phase of the video signal carrier wave, there is no need to differentially encode the sub-signal. Furthermore, the loop filter 16 functions to remove sub-signal components from the control signal supplied to the VCO 15 and reduce phase jitter of the reproduced carrier wave.

副信号の多重区間としては、水平あるいは垂直帰線消去
区間のすべて、あるいはそれらの一部の区間を選び、こ
の区間以外では副信号は無信号になるものを用いる。こ
のようにすることにより、直交歪による映像への妨害を
軽減することができる。なお、副信号は、デジタル信号
であっても良く、この場合はより低レベルで副信号を多
重し、さらには誤り訂正技術を導入することにより、副
信号、映像信号間の相互の妨害をより軽減することがで
きる。
All or part of the horizontal or vertical blanking interval is selected as the sub-signal multiplexing interval, and the sub-signal is non-signal outside this interval. By doing so, it is possible to reduce interference with images caused by orthogonal distortion. Note that the sub-signal may be a digital signal, in which case mutual interference between the sub-signal and the video signal can be further reduced by multiplexing the sub-signal at a lower level and further introducing error correction technology. It can be reduced.

以下本発明の第2の実施例について図面を参照しながら
説明する。
A second embodiment of the present invention will be described below with reference to the drawings.

第2図は本発明の第2の実施例を示す信号多重装置の回
路構成図である。同図において、1は搬送波入力端子、
2は振幅変調器、3は映像信号入力端子、4は90°移
相器、5は平衡変調器、6は副信号入力端子、7は合波
器、8は残留側波帯フィルタ、19は副信号帯域制限フ
ィルタで、送信系20が構成されている。9は伝送路で
ある。
FIG. 2 is a circuit diagram of a signal multiplexing device showing a second embodiment of the present invention. In the figure, 1 is a carrier wave input terminal;
2 is an amplitude modulator, 3 is a video signal input terminal, 4 is a 90° phase shifter, 5 is a balanced modulator, 6 is a sub signal input terminal, 7 is a multiplexer, 8 is a vestigial sideband filter, 19 is a A transmission system 20 is composed of a sub-signal band-limiting filter. 9 is a transmission path.

また、IOと14は平衡変調器、11は−90゜移相器
、12は映像信号用フィルタ、13は副信号用フィルタ
、15はVCO(電圧制御発振器)、16はループフィ
ルタ、17は映像信号出力端子、18は副信号出力端子
で、受信系21が構成されている。以上は第1図の構成
と同様のものである。
In addition, IO and 14 are balanced modulators, 11 is a -90° phase shifter, 12 is a video signal filter, 13 is a sub-signal filter, 15 is a VCO (voltage controlled oscillator), 16 is a loop filter, and 17 is a video signal filter. A signal output terminal 18 is a sub-signal output terminal, which constitutes a receiving system 21. The above configuration is similar to the configuration shown in FIG.

第1図の構成と異なっているのは、送信系20において
、副信号帯域制限フィルタ19と平衡変調器5の間にゲ
ートスイッチ22を設けた点である。
The difference from the configuration shown in FIG. 1 is that a gate switch 22 is provided between the sub-signal band-limiting filter 19 and the balanced modulator 5 in the transmission system 20.

上記のように構成された信号多重装置について、以下そ
の動作を説明する。映像信号の変調軸とは直交する変調
軸に、副信号を多重することは第1の実施例と同様であ
る。第1の実施例と異なるのは、ゲートスイッチ22に
よって、水平あるいは垂直帰線消去区間のすべて、ある
いは一部の多重を行う区間においてこのスイッチを導通
させる点である。このようにすることにより、副信号帯
域制限フィルタエ9のレスポンス、あるいは、副信号系
の雑音による映像信号への妨害を軽減することができる
The operation of the signal multiplexing device configured as described above will be explained below. Similar to the first embodiment, the sub-signal is multiplexed on a modulation axis perpendicular to the modulation axis of the video signal. The difference from the first embodiment is that the gate switch 22 is made conductive in all or part of the horizontal or vertical blanking interval in the multiplexing interval. By doing so, it is possible to reduce the response of the sub-signal band-limiting filter 9 or interference with the video signal due to noise in the sub-signal system.

以上のように、副信号帯域制限フィルタ19と平衡変調
器5の間にゲートスイッチ22を設けることにより、さ
らに映像信号への妨害を軽減することができる。
As described above, by providing the gate switch 22 between the sub-signal band-limiting filter 19 and the balanced modulator 5, interference to the video signal can be further reduced.

なお、第2の実施例において、ゲートスイッチ22は9
0°移相器4の前あるいは後、あるいは平衡変調器5の
後、あるいは副信号帯域制限フィルタ19の前に設置し
ても良い。
Note that in the second embodiment, the gate switch 22 has 9
It may be installed before or after the 0° phase shifter 4, after the balanced modulator 5, or before the sub-signal band-limiting filter 19.

発明の効果 以上のように本発明は、映像信号に対する振幅変調器と
、搬送波を90°移送する90°移送器と、副信号に対
する帯域制限フィルタと、該帯域制限フィルタを通過し
た副信号で、映像信号用搬送波とは90°位相の異なる
搬送波を振幅変調する平衡変調器と、該振幅変調器と該
平衡変調器の出力信号を合成する合波器と、該合波器の
出力信号の側波帯の一部を削り取る残留側波帯フィルタ
を備え、映像信号の変調軸とは直交する軸に、水平ある
いは垂直帰線消去区間のすべて、あるいは一部の区間、
副信号を多重することにより、スペクトル利用効率が良
く、また、構成が簡易な信号多重が可能となる。
Effects of the Invention As described above, the present invention provides an amplitude modulator for a video signal, a 90° shifter for shifting a carrier wave by 90°, a band-limiting filter for a sub-signal, and a sub-signal that has passed through the band-limiting filter. A balanced modulator that amplitude-modulates a carrier wave with a phase difference of 90 degrees from the video signal carrier wave, a multiplexer that combines the output signals of the amplitude modulator and the balanced modulator, and an output signal side of the multiplexer. It is equipped with a vestigial sideband filter that cuts out a part of the waveband, and all or part of the horizontal or vertical blanking interval, on the axis perpendicular to the modulation axis of the video signal,
By multiplexing sub-signals, signal multiplexing with good spectrum utilization efficiency and a simple configuration becomes possible.

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

第1図は本発明の第1の実施例における信号゛多重装置
の回路構成図、第2図は本発明の第2の実施例における
信号多重装置の回路構成図、第3図は従来の信号多重装
置の一例の回路構成図である。 1・・・・・・搬送波入力端子、2・・・・・・振幅変
調器、3・・・・・・映像信号入力端子、4・・・・・
・90°移相器、5゜10.14・・・・・・平衡変調
器、6・・・・・・副信号入力端子、7・・・・・・合
波器、8・・・・・・残留側波帯フィルタ、9・・・・
・・伝送路、11・・・・・・−90’移相器、12・
・・・・・映像信号用フィルタ、13・・・・・・副信
号用フィルタ、15・・・・・・電圧制御発振器(VC
O) 、16・・・・・・ループフィルタ、17・・・
・・・映像信号出力端子、18・・・・・・副信号出力
端子、19・・・・・・副信号帯域制限フィルタ、20
・・・・・・送信系、21・旧・・受信系、22・・・
・・・ケートスイッチ。
FIG. 1 is a circuit diagram of a signal multiplexing device according to a first embodiment of the present invention, FIG. 2 is a circuit diagram of a signal multiplexing device according to a second embodiment of the present invention, and FIG. 3 is a diagram of a conventional signal multiplexing device. FIG. 2 is a circuit configuration diagram of an example of a multiplexing device. 1... Carrier wave input terminal, 2... Amplitude modulator, 3... Video signal input terminal, 4...
・90° phase shifter, 5°10.14...Balanced modulator, 6...Sub signal input terminal, 7...Multiplexer, 8... ...Residual sideband filter, 9...
...Transmission line, 11...-90' phase shifter, 12.
...Video signal filter, 13...Sub signal filter, 15...Voltage controlled oscillator (VC
O), 16...Loop filter, 17...
...Video signal output terminal, 18...Sub signal output terminal, 19...Sub signal band limiting filter, 20
...Transmission system, 21. Old...Reception system, 22...
...Kate Switch.

Claims (3)

【特許請求の範囲】[Claims] (1)残留側波帯伝送方式を用いるテレビ信号伝送にお
いて、映像信号に対する振幅変調器と、搬送波を90°
移相する90°移相器と、副信号に対する帯域制限フィ
ルタと、該帯域制限フィルタを通過した副信号で、映像
信号用搬送波とは90°位相の異なる搬送波を振幅変調
する平衡変調器と、該振幅変調器と該平衡変調器の出力
信号を合成する合波器と、該合波器の出力信号の側波帯
の一部を削り取る残留側波帯フィルタとを具備し、副信
号を水平帰線消去区間および垂直帰線消去区間のすべて
の区間、または一部の区間に多重する信号多重装置。
(1) In television signal transmission using the vestigial sideband transmission method, the amplitude modulator for the video signal and the carrier wave are
a 90° phase shifter that shifts the phase; a band-limiting filter for a sub-signal; and a balanced modulator that amplitude-modulates a carrier wave that is 90° out of phase with the video signal carrier wave with the sub-signal that has passed through the band-limiting filter; A multiplexer that combines the output signals of the amplitude modulator and the balanced modulator, and a residual sideband filter that removes a part of the sideband of the output signal of the multiplexer, and horizontally converts the sub-signal. A signal multiplexing device that multiplexes all or part of the blanking interval and vertical blanking interval.
(2)副信号はデジタル信号であることを特徴とする特
許請求の範囲第1項記載の信号多重装置。
(2) The signal multiplexing device according to claim 1, wherein the sub-signal is a digital signal.
(3)このテレビ信号伝送は、CATV伝送系における
テレビ信号伝送であることを特徴とする特許請求の範囲
第1項または第2項記載の信号多重装置。
(3) The signal multiplexing device according to claim 1 or 2, wherein the television signal transmission is television signal transmission in a CATV transmission system.
JP22512285A 1985-10-09 1985-10-09 Signal multiplexer Expired - Lifetime JPH0648806B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22512285A JPH0648806B2 (en) 1985-10-09 1985-10-09 Signal multiplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22512285A JPH0648806B2 (en) 1985-10-09 1985-10-09 Signal multiplexer

Publications (2)

Publication Number Publication Date
JPS6284632A true JPS6284632A (en) 1987-04-18
JPH0648806B2 JPH0648806B2 (en) 1994-06-22

Family

ID=16824307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22512285A Expired - Lifetime JPH0648806B2 (en) 1985-10-09 1985-10-09 Signal multiplexer

Country Status (1)

Country Link
JP (1) JPH0648806B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006325233A (en) * 1997-12-24 2006-11-30 Parakan Pty Ltd Transmitter and method for transmitting data
US7978073B2 (en) 1997-12-24 2011-07-12 Magellan Technology Pty Limited Transmitter and a method for transmitting data

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2575687B2 (en) * 1987-03-06 1997-01-29 株式会社日立製作所 Magneto-optical storage device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006325233A (en) * 1997-12-24 2006-11-30 Parakan Pty Ltd Transmitter and method for transmitting data
US7978073B2 (en) 1997-12-24 2011-07-12 Magellan Technology Pty Limited Transmitter and a method for transmitting data

Also Published As

Publication number Publication date
JPH0648806B2 (en) 1994-06-22

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