JPH01190143A - Data transmission system - Google Patents
Data transmission systemInfo
- Publication number
- JPH01190143A JPH01190143A JP63015033A JP1503388A JPH01190143A JP H01190143 A JPH01190143 A JP H01190143A JP 63015033 A JP63015033 A JP 63015033A JP 1503388 A JP1503388 A JP 1503388A JP H01190143 A JPH01190143 A JP H01190143A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- data
- noise
- transmission data
- transmitted
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
【産業上の利用分野］
本発明は、光リモコン等のデジタル通信を行う゛データ
伝送装置のデータ伝送方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission system for a data transmission device that performs digital communication such as an optical remote control.
［従来の技術ｊ
従来の送信データを送信するタイミングは、例えば中継
機では信号を受信後、搬送波の有無を検知して他の送信
機などが信号を送信してないことを確認し、その後送信
を開始するようにしていた。[Conventional technology j] Conventionally, the timing of transmitting data is, for example, after receiving a signal at a repeater, it detects the presence or absence of a carrier wave to confirm that no other transmitter is transmitting the signal, and then transmits the data. I was trying to start.
なお、送信データは複数回送信することによりデータ伝
送の信頼性を向上させるようにしである。Note that the reliability of data transmission is improved by transmitting the transmission data multiple times.
【発明が解決しようとする課題］
上述の従来のデータ伝送方式では通信環境が悪く、ノイ
ズの発生が頻繁な場合にも、送信データの送信は一定回
数であり、このため信頼度の高い伝送は靜しいという問
題があった。[Problem to be solved by the invention] In the conventional data transmission method described above, even when the communication environment is poor and noise occurs frequently, the transmission data is sent a fixed number of times, so highly reliable transmission is not possible. The problem was that it was quiet.
本発明は上述の烹に鑑みて為されたものであり、その目
的とするところはぐノイズの発生頻度が頻繁で通信環境
が悪い場合にもデータ伝送の信頼性を向上することがで
きるデータ伝送方式を提供することにある。The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a data transmission method that can improve the reliability of data transmission even when noise occurs frequently and the communication environment is poor. Our goal is to provide the following.
［課題を解決するための手段１
上記目的を達成するために、本発明は送信データの送信
に対して確認応答を行わないデータ伝送装置において、
送信データの送信前にノイズの発生回数を偏走時間カウ
ントし、ノイズの発生回数によって送信データの送信回
数を変えるようにしたものである。[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides a data transmission device that does not perform an acknowledgment response to the transmission of transmission data.
The number of times noise occurs is counted during the deflection time before transmitting data, and the number of times transmitting data is changed depending on the number of times noise occurs.
また、上記ノイズの発生回数によって送信データの送信
回数を変える方法としては、同一の送信データを複数回
伝送する゛と共に、ノイズの発生回数が多いときに同一
送信データの送信回数を多くする方法、またはノイズの
発生回数が多いときには送信データの送信を一定時間保
留する方法、さらに複数フレームで１伝送単位を構成し
夫々のフレーム毎に同一送信データを連送して送信する
と共に、上記１伝送単位を複数回送信し、ノイズの発生
回数が多いときには連送する同一送信データの個数を多
くする方法がある。Further, as a method of changing the number of times of transmission of the transmission data according to the number of occurrences of noise, there is a method of transmitting the same transmission data multiple times, and a method of increasing the number of times of transmission of the same transmission data when the number of occurrences of noise is large. Alternatively, when the number of occurrences of noise is large, the transmission of transmission data is suspended for a certain period of time.Furthermore, one transmission unit is composed of multiple frames, and the same transmission data is continuously transmitted for each frame. There is a method of transmitting the same data multiple times, and when the number of occurrences of noise is large, increasing the number of pieces of the same transmission data that are continuously transmitted.
（作用）
本発明は、上述のように送信データの送信前にノイズの
発生回数を偏走時間カウントし、ノイズの発生回数によ
って送信データの送信回数を変えることにより、ノイズ
の発生頻度で決定される通信環境に応じて送信データの
送信回数を変えて、ノイズの多い通信環境の悪い場合に
おいても、より信頼性の高いデータ伝送ができるように
したものである。(Function) As described above, the present invention counts the number of noise occurrences during the flight time before transmitting the transmission data, and changes the number of times the transmission data is transmitted depending on the number of noise occurrences, thereby determining the frequency of noise occurrence. The number of times the data is sent is changed depending on the communication environment, so that data can be transmitted with higher reliability even in a noisy communication environment.
（実施例１） 第１図乃至第４図に本発明の一実施例を示す。(Example 1) An embodiment of the present invention is shown in FIGS. 1 to 4.
本実施例のデータ伝送はＦＳＫ信号によって行っており
、第２図に本実施例の受信部の回路構成を示す。この受
（Ｗ部は、受信素子としてのアンテナ１で取り込んだ受
信信号を高周波増幅回路２で増幅し、この増幅出力に局
部発振回路４出力をミキサ３で混合して中間周波数に変
換し、この中間周波数を中間周波増幅回路５でさらに増
幅して、復調回路６で復調する。なお、上記復調回路６
はＡＧＯ機能を備えている。この復調回路６出力はバン
ドパスフィルタ（ＢＰＦ）７を通した後に、検波回路８
″ｃ検波され、波形整形回路９で波形整形を竹ってデジ
タル信号に復元される。本実施例ではこの受信部にノイ
ズを検出するコンパレータ１０からなる／イズ検出手段
と、搬送波の有無を検出するローパスフィルタ１１とフ
ンパレータ１２とで構成された搬送波検出手段とを設け
である。ノイズは復調回路６出力から検出するようにし
てあり、この復調回路６出力は第３図（ａ）に示ように
なる。この第３図（＆）はインパルス／イＸ″（イ）が
重畳された場合を示すもので、通常の無変調の搬送波（
ロ）が受信されている場合やデータ（ハ）が受イδされ
ている場合よりも大きな出力となる。そこで、この復調
回路６出力としきい値Ｖａとをコンパレータ１０で比較
することにより、ノイズを検出している。このときのコ
ンパレータ１０出力を第３図（ｂ）に示す。このコンパ
レータ１０出力から送信機や中ａａａなどのデータ伝送
装置のマイコン等の制御回路（図示せず）がノイズの発
生頻度などを検出するようにしである。また、搬送波の
有無は復調回路６のＡＧＣ出力から検出するようにしで
ある。つまり、復調回路６のＡＧＣ出力は第４図（ａ）
に示す出力となり、このＡＧＣ出力をローパスフィルタ
１１に通すことにより周波数の高いノイズ成分などをカ
ットし、第４図（ｂ）に示すように搬送波のみの出力を
検出し、このローパスフィルタ１１出力をコンパレータ
１２にてしきい値と比較することにより、搬送波が存在
することを検出する（第４図（ｅ））、このコンパレー
タ１２出力もマイコン等の制御回路に入力され、搬送波
の有無が判断される。Data transmission in this embodiment is performed using FSK signals, and FIG. 2 shows the circuit configuration of the receiving section of this embodiment. This receiving (W part) amplifies the received signal taken in by the antenna 1 as a receiving element with a high frequency amplifier circuit 2, mixes this amplified output with the output of a local oscillation circuit 4 with a mixer 3, converts it to an intermediate frequency, and converts the received signal into an intermediate frequency. The intermediate frequency is further amplified by the intermediate frequency amplification circuit 5 and demodulated by the demodulation circuit 6.
has an AGO function. The output of this demodulation circuit 6 is passed through a band pass filter (BPF) 7 and then passed through a detection circuit 8.
The signal is detected and restored to a digital signal by shaping the waveform in the waveform shaping circuit 9. In this embodiment, the receiving section includes noise detection means consisting of a comparator 10 for detecting noise and detecting the presence or absence of a carrier wave. A carrier detection means is provided, which is composed of a low-pass filter 11 and a humpator 12.Noise is detected from the output of the demodulation circuit 6, and the output of the demodulation circuit 6 is shown in FIG. 3(a). This figure 3 (&) shows the case where impulse/I
The output is larger than when data (b) is received or when data (c) is received. Therefore, the noise is detected by comparing the output of the demodulation circuit 6 and the threshold value Va using the comparator 10. The output of the comparator 10 at this time is shown in FIG. 3(b). From the output of the comparator 10, a control circuit (not shown) such as a microcomputer of a data transmission device such as a transmitter or an intermediate AAA detects the frequency of noise occurrence. Further, the presence or absence of a carrier wave is detected from the AGC output of the demodulation circuit 6. In other words, the AGC output of the demodulation circuit 6 is as shown in FIG. 4(a).
This AGC output is passed through the low-pass filter 11 to cut out high-frequency noise components, and as shown in FIG. 4(b), the output of only the carrier wave is detected, and the output of this low-pass filter 11 is The presence of a carrier wave is detected by comparing it with a threshold value in the comparator 12 (Fig. 4 (e)). The output of this comparator 12 is also input to a control circuit such as a microcomputer, and the presence or absence of a carrier wave is determined. Ru.
以下、本実施例の上記マイクコン等で構成される制御回
路による信号処理動作について第１図に従って説明する
。この送信機あるいは中ＳａＷにおいては、制御回路で
コンパレータ１０出力を監視することにより、一定時間
に発生するインパルスノイズの発生回路数を計数する。Hereinafter, the signal processing operation by the control circuit constituted by the above-mentioned microphone controller and the like of this embodiment will be explained with reference to FIG. In this transmitter or medium SaW, by monitoring the output of the comparator 10 with a control circuit, the number of impulse noise generating circuits occurring in a certain period of time is counted.
この一定時間に発生した／イにの計数値をＮｃ回として
説明する。The count value of /A that occurred in this fixed time will be explained as Nc times.
次に、ノイズが頻繁に発生していることを示す判定基準
である予め設定された基準値Ｌ１と上記計数値Ｎｃとを
比較して、基準値り、より計数値Ｎｃが大きい場合、つ
まりノイズが頻繁に発生している場合、同一の送信デー
タをＮ３回送信する。なお、この送信データの送信に際
しては、上述のコンパレータ１２出力から制御回路が搬
送波がないことを確認した後に行う。但し、搬送波が有
った場合には、カウンタのカウント値をクリアして、さ
らに上述した一定時間のノイズカウント動作及び計数値
Ｎｃと基準値し、との比較動作を繰り返し、搬送波がな
い場合に初めて送信を行う。一方、計数値Ｎｃが基準値
り、より小さい場合、この場合にはノイズの発生頻度は
少ないことを意味するので、上記送信回数Ｎ、より少な
い送信回数Ｎ２で同一送信データを送信する。つまり、
本実施例ではノイズの発生頻度に応じて送信データの送
信回数を増やして、データ伝送の信頼性を向上させてい
るのである。なお、本実施例では説明の簡単のために基
準値は１個だけとして説明したが、勿論２個以上の基準
値と計数値Ｎｃとを比較して送信データの送信回数をさ
らに複数種の回数に変えるようにしても良い。Next, the count value Nc is compared with a preset reference value L1, which is a judgment criterion indicating that noise is frequently occurring, and if the count value Nc is larger than the reference value, that is, the noise is If this occurs frequently, the same transmission data is transmitted N3 times. Note that this transmission data is transmitted after the control circuit confirms that there is no carrier wave from the output of the comparator 12 described above. However, if there is a carrier wave, the count value of the counter is cleared, and the above-mentioned noise counting operation for a certain period of time and comparison operation with the counted value Nc and the reference value are repeated, and when there is no carrier wave, the counter value is cleared. Send for the first time. On the other hand, if the count value Nc is smaller than the reference value, this means that the frequency of noise occurrence is low, so the same transmission data is transmitted with the above-mentioned number of transmissions N, but with a smaller number of transmissions N2. In other words,
In this embodiment, the reliability of data transmission is improved by increasing the number of times transmission data is transmitted according to the frequency of noise occurrence. In addition, in this embodiment, for the sake of simplicity, the number of reference values is only one, but of course, two or more reference values and the count value Nc are compared to determine the number of times the transmission data is transmitted. You may also change it to
（実施例２）
第５図に本発明の他の実施例の制御回路の信号処理動作
を示す。本実施例では上述の第１の実施例と同様に偏走
時間／イＸのカウントを行うのであるが、本実施例の場
合にはノイズの計数値Ｎｃが基準値Ｌ１よりも大きい場
合には、一定時間待機し、つまり送信は行わず、この待
機時間が経過した後に新たに一定時間のノイズカウント
を行い、ノイズの発生頻度が基準値し、以下になったと
きにデータの伝送を行うようにしである。この場合の送
信データの送信も、搬送波が無くなったことを確認した
後に行う。このようにノイズの発生頻度が高い場合には
送信データの伝送を行わないことにより、ノイズにより
送信データにエラーを生じることを未然に防止すること
ができる。なお、本実施例においても基準値を複数個設
けて、基準値に応じてｔ４ｆｍ時間を複数種に可変する
ようにしても良い。(Embodiment 2) FIG. 5 shows a signal processing operation of a control circuit according to another embodiment of the present invention. In this embodiment, the deflection time/iX is counted in the same manner as in the first embodiment described above, but in the case of this embodiment, when the noise count value Nc is larger than the reference value L1, , it waits for a certain period of time, that is, it does not transmit, and after this waiting time has passed, it performs a new noise count for a certain period of time, and when the frequency of noise occurrence reaches the reference value and becomes less than that, data transmission is performed. It's Nishide. Transmission of transmission data in this case is also performed after confirming that the carrier wave is gone. By not transmitting the transmission data when the frequency of occurrence of noise is high as described above, it is possible to prevent errors from occurring in the transmission data due to noise. Note that in this embodiment as well, a plurality of reference values may be provided, and the t4fm time may be varied in a plurality of types according to the reference values.
（実施例３）
第６図及び第７図に本発明のさらに他の実施例を示す６
本実施例においても上述の実施例と同様に一定時間のノ
イズカウントを行うとともに、ノイズの計数値Ｎｃと基
準値り、との比較を行い、搬送波が無いことを確認して
送信を行う、ところで、本実施例ではノイズの計数値Ｎ
ｃが基準値Ｌ１よりも大きい場合には、−伝送単位を複
数フレーム（ｎｌ）で構成し、このフレーム毎に同一送
信データを送信し、さらに１伝送単位を複数回送信する
。つまり、送信データを連送すると共に、さらにこの運
送データを複数回送信するのである。第７図（ｂ）に１
伝送単位が２フレームで、ある時間において３回送信し
た場合を示す。この場合、同一データが２連送されるか
ら、受信側で運送チエツク等を実施すれば、データ伝送
の信頼性が向上する。また、ノイズの計数値Ｎｃが基準
値し、よりも小さい場合には、１伝送単位を構成する７
レ一ム敗を小さくして（フレーム数を０２として）送信
する。第７図（ｂ）は１伝送単位を１にした例を示す。(Embodiment 3) FIGS. 6 and 7 show still another embodiment of the present invention.
In this embodiment, as in the above-mentioned embodiment, noise is counted for a certain period of time, and the noise count value Nc is compared with the reference value R, and transmission is performed after confirming that there is no carrier wave. , in this example, the noise count N
If c is larger than the reference value L1, - the transmission unit is composed of multiple frames (nl), the same transmission data is transmitted for each frame, and one transmission unit is transmitted multiple times. In other words, the transmission data is sent continuously, and the transport data is also sent multiple times. 1 in Figure 7(b)
The case where the transmission unit is 2 frames and is transmitted 3 times in a certain time is shown. In this case, since the same data is sent twice, the reliability of data transmission can be improved by carrying out a transportation check on the receiving side. In addition, if the noise count value Nc is smaller than the reference value, then 7
Transmit with a smaller frame loss (set the number of frames to 02). FIG. 7(b) shows an example in which one transmission unit is one.
この場合には運送チエツクを行うことができないから、
信頼性は連送した場合に比べて劣る。しかし、送信する
フレームが少ないほど、他の信号と混信する確率が低く
なるので、ノイズが少ない時は送信フレーム数は少ない
方が好ましい。In this case, a transportation check cannot be performed, so
Reliability is lower than when sending continuously. However, the fewer frames to be transmitted, the lower the probability of interference with other signals, so when there is little noise, it is preferable to have fewer frames to transmit.
［発明の効果１
本発明は上述のように、送信データの送信前にノイズの
発生回数を一定時間カウントし、ノイズの発生回数によ
って送信データの送信回数を変えているので、通信環境
に応じて送信状態を変えて、ノイズの大きい環境におい
てもより信頼性の高いデータ伝送ができる効果があり、
特に送信データの送信に対して確認応答の返送を行わな
いデータ伝送において有効である。[Effect of the Invention 1] As described above, the present invention counts the number of noise occurrences for a certain period of time before transmitting the transmission data, and changes the number of times the transmission data is transmitted depending on the number of noise occurrences. It has the effect of changing the transmission state and enabling more reliable data transmission even in noisy environments.
This is particularly effective in data transmission in which no acknowledgment is returned for the transmission of transmitted data.
また、同一の送信データを複数回伝送すると共に、上記
ノイズの発生回数が多い場合には、同一送信データの送
信回数を多くすることにより、ノイズの影響を受けない
期間に送信データを送信できる可能性が高くなる。In addition, if the same transmission data is transmitted multiple times and the above noise occurs many times, it is possible to transmit the transmission data during a period where it is not affected by noise by increasing the number of times the same transmission data is transmitted. becomes more sexual.
さらにノイズの発生回数が多い場合には、送信データの
送信を一定時間保留することにより、ノイズにより送信
データにエラーを生じることを未然に防止することがで
きる。Furthermore, if the number of occurrences of noise is large, by suspending transmission of the transmission data for a certain period of time, it is possible to prevent errors from occurring in the transmission data due to noise.
さらにまた、複数フレームで１伝送単位を構成し夫々の
フレーム毎に同一送信データを連送して送信すると共に
、上記１伝送単位を複数回送信し、上記ノイズの発生回
数が多い場合には連送する同一送信データの個数を多く
することにより、同一送信データが複数個連送されるの
で、受信側で運送チエツク等を実施すれば、さらにデー
タ伝送の信頼性を向上することができる。Furthermore, one transmission unit is composed of multiple frames, and the same transmission data is continuously transmitted for each frame, and the one transmission unit is transmitted multiple times, and if the number of occurrences of the noise is large, the same transmission data is continuously transmitted. By increasing the number of pieces of the same transmission data, a plurality of pieces of the same transmission data are sent in succession, so if the receiving side performs a transportation check, etc., the reliability of data transmission can be further improved.
第１図は本発明の一実施例の制御回路の信号処理動作を
示す７０−チャート、第２図は同上の受信部の回路図、
第３図及び第４図は同上の要部の動作説明図、第５図は
本発明の他の実施例の制御回路の信号処理動作を示す７
０−チャート、第６図は本発明のさらに他の実施例の制
御回路の信号処理動作を示す７０−チャート、第７図は
送信データの伝送方法を示す動作説明図である。
Ｎｃは計数値、Ｌ、は基準値、Ｎ 、、Ｎ ２は送信回
数、ｎｌ ｔｎｚはフレーム数である。
代理人 弁理士 石 １）艮 七
第１図
第５図
昭和６３年３月１２日FIG. 1 is a 70-chart showing the signal processing operation of a control circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the receiving section of the same as above,
3 and 4 are operation explanatory diagrams of the main parts of the same as above, and FIG. 5 is a diagram showing the signal processing operation of a control circuit according to another embodiment of the present invention.
0-chart, FIG. 6 is a 70-chart showing the signal processing operation of a control circuit according to still another embodiment of the present invention, and FIG. 7 is an operation explanatory diagram showing a transmission data transmission method. Nc is a count value, L is a reference value, N2, N2 is the number of transmissions, and nl tnz is the number of frames. Agent Patent Attorney Ishi 1) Ai 7 Figure 1 Figure 5 March 12, 1986
Claims (4)
ータ伝送装置において、送信データの送信前にノイズの
発生回数を一定時間カウントし、ノイズの発生回数によ
って送信データの送信回数を変えて成ることを特徴とす
るデータ伝送方式。(1) In a data transmission device that does not provide an acknowledgment response to the transmission of transmission data, the number of times noise occurs is counted for a certain period of time before transmitting the transmission data, and the number of times the transmission data is transmitted is changed depending on the number of times noise occurs. A data transmission method characterized by:
ノイズの発生回数が多い場合には、同一送信データの送
信回数を多くして成る請求項１記載のデータ伝送方式。(2) The data transmission system according to claim 1, wherein the same transmission data is transmitted a plurality of times, and when the number of occurrences of the noise is large, the number of times the same transmission data is transmitted is increased.
タの送信を一定時間保留して成る請求項１記載のデータ
伝送方式。(3) The data transmission system according to claim 1, wherein when the number of occurrences of the noise is large, transmission of the transmission data is suspended for a certain period of time.
ム毎に同一送信データを連送して送信すると共に、上記
１伝送単位を複数回送信し、上記ノイズの発生回数が多
い場合には連送する同一送信データの個数を多くして成
る請求項１記載のデータ伝送方式。(4) One transmission unit is composed of multiple frames, and the same transmission data is continuously transmitted for each frame, and one transmission unit is transmitted multiple times, and if the number of occurrences of the noise is large, the same transmission data is continuously transmitted. 2. The data transmission system according to claim 1, wherein the number of pieces of the same transmission data is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015033A JPH01190143A (en) | 1988-01-26 | 1988-01-26 | Data transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015033A JPH01190143A (en) | 1988-01-26 | 1988-01-26 | Data transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01190143A true JPH01190143A (en) | 1989-07-31 |
Family
ID=11877521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63015033A Pending JPH01190143A (en) | 1988-01-26 | 1988-01-26 | Data transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01190143A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022380A1 (en) * | 1999-09-21 | 2001-03-29 | Kim Seung Dol | Asynchronous power line transmission apparatus |
| JP2008098901A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Data communication system |
| WO2010097889A1 (en) * | 2009-02-24 | 2010-09-02 | 三菱電機株式会社 | Safety control system and method for safety control |
| JP2011009875A (en) * | 2009-06-23 | 2011-01-13 | Nec Access Technica Ltd | Transmitter, receiver, communication system, transmission method, reception method, transmission control program, and reception control program |
| WO2011099281A1 (en) | 2010-02-10 | 2011-08-18 | パナソニック株式会社 | Transmitter apparatus, receiver apparatus, transmission method and reception method |
-
1988
- 1988-01-26 JP JP63015033A patent/JPH01190143A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022380A1 (en) * | 1999-09-21 | 2001-03-29 | Kim Seung Dol | Asynchronous power line transmission apparatus |
| JP2008098901A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Data communication system |
| WO2010097889A1 (en) * | 2009-02-24 | 2010-09-02 | 三菱電機株式会社 | Safety control system and method for safety control |
| JP5197844B2 (en) * | 2009-02-24 | 2013-05-15 | 三菱電機株式会社 | Safety control system and safety control method |
| JP2011009875A (en) * | 2009-06-23 | 2011-01-13 | Nec Access Technica Ltd | Transmitter, receiver, communication system, transmission method, reception method, transmission control program, and reception control program |
| WO2011099281A1 (en) | 2010-02-10 | 2011-08-18 | パナソニック株式会社 | Transmitter apparatus, receiver apparatus, transmission method and reception method |
| US9077377B2 (en) | 2010-02-10 | 2015-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Transmission device and reception device for communication in an environment with strong external noise, and transmission method and reception method for the same |
| US10097205B2 (en) | 2010-02-10 | 2018-10-09 | Sun Patent Trust | Transmission device, reception device, transmission method, and reception method for suppressing the degrading of decoding performance due to combinations of eliminations at the bit level |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5818929A (en) | Method and apparatus for DTMF detection | |
| MY130355A (en) | Soft decision signal estimation | |
| KR960013301B1 (en) | Modem and data communication system | |
| JPH01190143A (en) | Data transmission system | |
| JPH04229753A (en) | Lockup prevention method and asynchronous modem | |
| GB1289378A (en) | ||
| JPS6224972B2 (en) | ||
| JP2562140B2 (en) | Wireless signal transmission system | |
| JPH03101546A (en) | Digital signal read system | |
| JP3701625B2 (en) | Squeltilt illumination signal detection method | |
| JPH0446420A (en) | Area communication system | |
| JP2798034B2 (en) | Voice control signal transmission device | |
| JPS63169141A (en) | Transmission error detection circuit | |
| RU1793560C (en) | Device for receiving tone signals | |
| JPS611142A (en) | Data transmission equipment | |
| JP2929929B2 (en) | In-band signal detection circuit | |
| JPH09102778A (en) | Error pulse data transmission and reception system | |
| JPH0457537A (en) | Transmission speed detection system | |
| JPS61116441A (en) | Level detecting system | |
| JPS62266941A (en) | Collision detecting method for transmission line | |
| JPH0456551A (en) | Radio transmitter-receiver | |
| JPH01222544A (en) | Power line carrier | |
| JPH02101825A (en) | Simplex radio communication system | |
| JPH1070522A (en) | Data receiver | |
| JPS62141935A (en) | Power line signal carrier transmission |