JP2002232495A - Demodulator for ask modulated signal - Google Patents
Demodulator for ask modulated signalInfo
- Publication number
- JP2002232495A JP2002232495A JP2001022466A JP2001022466A JP2002232495A JP 2002232495 A JP2002232495 A JP 2002232495A JP 2001022466 A JP2001022466 A JP 2001022466A JP 2001022466 A JP2001022466 A JP 2001022466A JP 2002232495 A JP2002232495 A JP 2002232495A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- ask
- modulated signal
- carrier
- monostable multivibrator
- 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
Links
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、発振信号である搬
送パルスをディジタル情報であるデータ信号に応じてオ
ン・オフするＡＳＫ（Ａｍｐｌｉｔｕｄｅ Ｓｈｉｆｔ
Ｋｅｙｉｎｇ）変調信号を復調するためのＡＳＫ変調信
号の復調装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ASK (Amplitude Shift) for turning on / off a carrier pulse as an oscillation signal according to a data signal as digital information.
Keying) A demodulation device for demodulating an ASK modulation signal for demodulating a modulation signal.
【０００２】[0002]
【従来の技術】例えば、図７に示すように、変調装置５
１により、図８（イ）に示すデータ信号（ディジタル情
報）を、所定幅の搬送パルス（発振信号）を持つ搬送波
で振幅変調した図８（ロ）に示すＡＳＫ変調信号を、二
本の信号線５３，５４によって送信し、そのＡＳＫ変調
信号を、復調装置５５で受信するようにしたデータ通信
システムが、工作機の工具や、工場における部品、製品
の管理又は物流システム等に用いられているが、このよ
うな通信システムに使用される従来のＡＳＫ変調信号の
復調装置５５は、図９に示すように、受信したＡＳＫ変
調信号（図１０（イ）、図１１（イ）に示す点Ａの電圧
波形）を、コンパレータ５７で波形整形（図１０
（ロ）、図１１（ロ）に示す点Ｂの電圧波形）した後、
搬送パルス幅よりやや長い時定数をもった単安定マルチ
バイブレータ５７に入力して、単安定マルチバイブレー
タ５７を動作させ、単安定マルチバイブレータ５７の出
力により、ＡＳＫ変調信号の搬送パルスによる振動があ
る期間を、データ信号とする復調波形（図１０（ハ）、
図１１（ハ））を得ている。2. Description of the Related Art For example, as shown in FIG.
1, the ASK modulation signal shown in FIG. 8B obtained by amplitude-modulating the data signal (digital information) shown in FIG. 8A with a carrier having a carrier pulse (oscillation signal) having a predetermined width is converted into two signals. A data communication system in which the ASK modulation signal is transmitted by the lines 53 and 54 and the demodulation device 55 receives the ASK modulation signal is used for a tool of a machine tool, a part or product management or a distribution system in a factory. However, the conventional ASK modulation signal demodulation device 55 used in such a communication system uses a received ASK modulation signal (point A shown in FIG. 10A and FIG. 11A) as shown in FIG. The voltage waveform of FIG.
(B), the voltage waveform at point B shown in FIG.
A period is input to a monostable multivibrator 57 having a time constant that is slightly longer than the carrier pulse width to operate the monostable multivibrator 57, and the output of the monostable multivibrator 57 causes oscillation due to the carrier pulse of the ASK modulation signal. Is a demodulated waveform as a data signal (FIG. 10 (c),
FIG. 11C is obtained.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来では、信
号線５３，５４が短い場合には、点Ａの電圧、点Ｂの電
圧及び点Ｃの電圧が、図１１（イ）（ロ）（ハ）に示す
ような電圧波形であったものが、信号線５３，５４が長
い場合には、ＬＣによる振動電圧が発生するため、図１
０（イ）に示すように、ＡＳＫ変調信号に振動波形ａが
生じ、これがために、図１０（ロ）及び図１０（ハ）に
示すように点Ｂの電圧波形及び点Ｃの電圧波形にも誤パ
ルスが発生し、データ信号を正確に復調できなくなるお
それがあった。However, conventionally, when the signal lines 53 and 54 are short, the voltage at the point A, the voltage at the point B, and the voltage at the point C are changed as shown in FIGS. In the case of the voltage waveform shown in (c), when the signal lines 53 and 54 are long, an oscillating voltage is generated by the LC.
As shown in FIG. 10 (b), an oscillation waveform a occurs in the ASK modulation signal, which causes the voltage waveform at point B and the voltage waveform at point C as shown in FIGS. 10 (b) and 10 (c). Also, there is a possibility that an erroneous pulse is generated and the data signal cannot be demodulated accurately.
【０００４】本発明は上記問題点に鑑み、簡単な回路構
成で、ＡＢＳ変調信号からデータ信号を正確に復調でき
るようにしたものである。The present invention has been made in view of the above problems, and is intended to accurately demodulate a data signal from an ABS modulated signal with a simple circuit configuration.
【０００５】[0005]
【課題を解決するための手段】この技術的課題を解決す
る本発明の技術的手段は、ＡＳＫ変調信号からデータ信
号を復調するようにしたＡＳＫ変調信号の復調装置にお
いて、ＡＳＫ変調信号の搬送パルスの振動が２個以上連
続している期間を、データ信号として復調するようにし
た点にある。本発明の他の技術的手段は、所定幅の搬送
パルスを持つ搬送波でデータ信号を振幅変調したＡＳＫ
変調信号を、受信して、その受信したＡＳＫ変調信号か
らデータ信号を取り出すようにしたＡＳＫ変調信号の復
調装置において、受信したＡＳＫ変調信号を波形整形し
た後、搬送パルス幅よりもやや長い時定数をもった単安
定マルチバイブレータ３に入力し、単安定マルチバイブ
レータ３の出力信号と、前記ＡＳＫ変調信号を波形整形
した信号とから、ＡＳＫ変調信号の搬送パルス幅の２倍
以下の信号を取り除いて、ＡＳＫ変調信号の搬送パルス
の振動が、搬送パルス幅の２倍以上続いている期間を、
データ信号として取り出すようにした点にある。The technical means of the present invention for solving this technical problem is to provide an ASK modulation signal demodulating apparatus for demodulating a data signal from an ASK modulation signal. Is that the period during which two or more vibrations are continuous is demodulated as a data signal. Another technical means of the present invention is an ASK in which a data signal is amplitude-modulated by a carrier having a carrier pulse having a predetermined width.
In a demodulator for an ASK modulation signal, which receives a modulation signal and extracts a data signal from the received ASK modulation signal, after shaping the waveform of the received ASK modulation signal, the time constant is slightly longer than the carrier pulse width. Is input to the monostable multivibrator 3 having a symbol, and a signal having a waveform equal to or less than twice the carrier pulse width of the ASK modulated signal is removed from the output signal of the monostable multivibrator 3 and the signal obtained by shaping the waveform of the ASK modulated signal. , The period during which the oscillation of the carrier pulse of the ASK modulation signal continues at least twice the carrier pulse width,
The point is that it is taken out as a data signal.
【０００６】本発明の他の技術的手段は、所定幅の搬送
パルスを持つ搬送波でデータ信号を振幅変調したＡＳＫ
変調信号を、受信して、その受信したＡＳＫ変調信号か
らデータ信号を取り出すようにしたＡＳＫ変調信号の復
調装置において、受信したＡＳＫ変調信号を、波形整形
した後、搬送パルス幅よりやや長い時定数をもった単安
定マルチバイブレータ３に入力し、単安定マルチバイブ
レータ３の出力信号と、前記受信したＡＳＫ変調信号を
波形整形した信号とから、単安定マルチバイブレータ３
の出力信号よりも、ＡＳＫ変調信号の次の搬送パルス分
だけずれた出力信号を取り出すＤフリップフロップ回路
４が設けられ、前記単安定マルチバイブレータ３の出力
信号とＤフリップフロップ回路４の出力信号との論理条
件から、ＡＳＫ変調信号の搬送パルス幅の２倍以下の信
号を取り除いて、ＡＳＫ変調信号の搬送パルスの振動
が、搬送パルス幅の２倍以上続いている期間を、データ
信号として取り出すようにした点にある。Another technical means of the present invention is an ASK in which a data signal is amplitude-modulated by a carrier having a carrier pulse having a predetermined width.
In a demodulator for an ASK modulated signal, which receives a modulated signal and extracts a data signal from the received ASK modulated signal, a time constant slightly longer than a carrier pulse width after shaping the waveform of the received ASK modulated signal. Is input to the monostable multivibrator 3 having the symbol A, and the output signal of the monostable multivibrator 3 and the signal obtained by shaping the waveform of the received ASK modulation signal are used as the monostable multivibrator 3.
And a D flip-flop circuit 4 for extracting an output signal shifted by the next carrier pulse of the ASK modulation signal from the output signal of the monostable multivibrator 3 and the output signal of the D flip-flop circuit 4. From the logical conditions described above, a signal whose carrier pulse width is twice or less of the ASK modulation signal is removed, and a period in which the vibration of the carrier pulse of the ASK modulation signal lasts at least twice the carrier pulse width is extracted as a data signal. It is in the point which was made.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づき説明する。図１において、１はコンパレータ
で、受信したＡＢＳ変調信号を入力して、その搬送パル
スが一定電圧の矩形波となるように波形整形する。この
コンパレータ１が入力するＡＢＳ変調信号は、図示省略
の変調装置によって、データ信号（ディジタル情報）
を、所定幅の搬送パルス（発振信号）を持つ搬送波で振
幅変調したものであって、図８（ロ）又は図１０（イ）
に示す電圧波形と同様に、発振信号である搬送パルスを
ディジタル情報であるデータ信号に応じてオン・オフす
るようになっており、長い二本の信号線によって、変調
装置から長距離に亘って送信されたものである。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a comparator which receives a received ABS modulation signal and shapes the carrier pulse so that the carrier pulse becomes a rectangular wave having a constant voltage. The ABS modulated signal input to the comparator 1 is converted into a data signal (digital information) by a modulator (not shown).
Is amplitude-modulated by a carrier having a carrier pulse (oscillation signal) having a predetermined width, and FIG. 8B or FIG.
As in the case of the voltage waveform shown in FIG. 1, the carrier pulse that is an oscillation signal is turned on and off in accordance with the data signal that is digital information, and is extended over a long distance from the modulation device by two long signal lines. It was sent.
【０００８】３は単安定マルチバイブレータで、ＡＢＳ
変調信号の搬送パルスのパルス幅よりやや長い時定数を
もっており、コンパレータ１の出力信号（図２（ロ）に
示す点Ｂの電圧波形）の立ち下がりで、電圧が立ち下が
って、搬送パルスのパルス幅よりやや長い期間までＬ電
圧（零又は低電圧）を保持するように構成されている。
従って、単安定マルチバイブレータ３は、コンパレータ
１から入力したＡＢＳ変調信号の搬送パルスの振動が連
続しているときには、図２（ロ）に示すように、搬送パ
ルスが連続した期間はＬ電圧を保持した１つのオン信号
又はオフ信号を出力する。[0008] 3 is a monostable multivibrator, ABS
It has a time constant that is slightly longer than the pulse width of the carrier pulse of the modulation signal. When the output signal of the comparator 1 (the voltage waveform at the point B shown in FIG. 2B) falls, the voltage falls and the pulse of the carrier pulse It is configured to hold the L voltage (zero or low voltage) for a period slightly longer than the width.
Therefore, when the oscillation of the carrier pulse of the ABS modulation signal input from the comparator 1 is continuous, the monostable multivibrator 3 holds the L voltage during the period in which the carrier pulse is continuous, as shown in FIG. One of the ON signal or the OFF signal is output.
【０００９】４はＤフリップフロップ回路で、Ｄ入力端
子に単安定マルチバイブレータ３の出力信号（図２
（ロ）に示す点Ｃの電圧波形）を入力すると共に、クロ
ック入力端子にコンパレータ１の出力信号（図２（イ）
に示す点Ｂの電圧波形）を入力し、Ｑ出力端子から、点
Ｂの電圧波形の立ち下がりで、点Ｃの電圧波形に切り換
わりる出力信号（図２（ハ）に示す点Ｄの電圧波形）を
出力する。６はＮＯＲ回路で、単安定マルチバイブレー
タ３の出力信号とＤフリップフロップ回路４の出力信号
とを入力する。７はＮＯＴ回路で、ＮＯＲ回路６の出力
信号（図２（ニ）に示す点Ｅの電圧波形）を入力する。
前記ＮＯＲ回路６とＮＯＴ回路７とでＯＲ回路８を構成
し、ＯＲ回路８の出力信号（図２（ホ）に示す点Ｆの電
圧波形）を、ＡＢＳ変調信号を復調したデータ信号とし
て取り出すようになっている。Reference numeral 4 denotes a D flip-flop circuit. The output signal of the monostable multivibrator 3 is input to a D input terminal (FIG. 2).
(B), and the output signal of the comparator 1 (FIG. 2 (a)) is input to the clock input terminal.
2), and an output signal (the voltage at point D shown in FIG. 2 (c)) which is switched from the Q output terminal to the voltage waveform at point C at the falling edge of the voltage waveform at point B Waveform). Reference numeral 6 denotes a NOR circuit to which an output signal of the monostable multivibrator 3 and an output signal of the D flip-flop circuit 4 are input. Reference numeral 7 denotes a NOT circuit to which an output signal of the NOR circuit 6 (a voltage waveform at a point E shown in FIG. 2D) is input.
The NOR circuit 6 and the NOT circuit 7 constitute an OR circuit 8, and an output signal of the OR circuit 8 (a voltage waveform at a point F shown in FIG. 2E) is extracted as a data signal obtained by demodulating an ABS modulation signal. It has become.
【００１０】上記実施の形態によれば、受信したＡＢＳ
変調信号を、図２（イ）に示すように、コンパレータ１
でその搬送パルスが一定電圧の矩形波となるように波形
整形し、この波形整形したＡＢＳ変調信号を、単安定マ
ルチバイブレータ３が入力して、単安定マルチバイブレ
ータ３は、コンパレータ１の出力信号（図２（イ）に示
す点Ｂの電圧波形）の立ち下がりで、電圧が立ち下がっ
て、搬送パルスのパルス幅よりやや長い期間までＬ電圧
を保持する出力信号（図２（ロ）に示す点Ｃの電圧波
形）を出力する。According to the above embodiment, the received ABS
The modulated signal is supplied to a comparator 1 as shown in FIG.
Then, the carrier pulse is shaped into a rectangular wave with a constant voltage, and the ABS-modulated signal whose shape is shaped is input to the monostable multivibrator 3, and the monostable multivibrator 3 outputs the output signal ( At the fall of the voltage waveform at point B shown in FIG. 2A, the voltage falls, and the output signal holds the L voltage for a period slightly longer than the pulse width of the carrier pulse (point shown in FIG. 2B). C voltage waveform).
【００１１】そして、Ｄフリップフロップ回路４が、Ｄ
入力端子に単安定マルチバイブレータ３の出力信号（図
２（ロ）に示す点Ｃの電圧波形）を入力すると共に、ク
ロック入力端子にコンパレータ１の出力信号（図２
（イ）に示す点Ｂの電圧波形）を入力し、Ｄフリップフ
ロップ回路４は、Ｑ出力端子から、点Ｂの電圧波形の立
ち下がりで、点Ｃの電圧波形に切り換わりる出力信号
（図２（ハ）に示す点Ｄの電圧波形）を出力し、ＯＲ回
路８が、単安定マルチバイブレータ３の出力信号とＤフ
リップフロップ回路４の出力信号とを入力して、両方の
信号が共にＬ電圧のときにＬ電圧となる信号（図２
（ホ）に示す点Ｆの電圧波形）を出力し、このＯＲ回路
８の出力信号を、ＡＢＳ変調信号を復調したデータ信号
として取り出す。Then, the D flip-flop circuit 4
The output signal of the monostable multivibrator 3 (voltage waveform at the point C shown in FIG. 2B) is input to the input terminal, and the output signal of the comparator 1 (FIG.
(B), and the D flip-flop circuit 4 switches the output signal from the Q output terminal to the voltage waveform at the point C at the falling edge of the voltage waveform at the point B (see FIG. 2 (c), the OR circuit 8 receives the output signal of the monostable multivibrator 3 and the output signal of the D flip-flop circuit 4, and both signals are L. A signal that becomes an L voltage when a voltage (FIG. 2)
(E) The output signal of the OR circuit 8 is extracted as a data signal obtained by demodulating the ABS modulation signal.
【００１２】従って、Ｄフリップフロップ回路４が、単
安定マルチバイブレータ３の出力信号を、点Ｂの電圧波
形の立ち下がりで、ラッチして、波形合成し、Ｄフリッ
プフロップ回路４の出力信号は、単安定マルチバイブレ
ータ３の出力信号よりも、ＡＳＫ変調信号の次の搬送パ
ルス分だけずれた電圧波形となり、ＯＲ回路８により、
単安定マルチバイブレータ３の出力信号とＤフリップフ
ロップ回路４の出力信号との論理条件から、ＡＳＫ変調
信号の搬送パルス幅の２倍以下の信号を取り除いて、Ａ
ＳＫ変調信号の搬送パルスの振動が、搬送パルス幅の２
倍以上続いている期間を、データ信号として取り出す。
その結果、ＬＣによる振動電圧が発生して、ＡＳＫ変調
信号に振動波形が生じることによる誤パルスが点Ｂの電
圧波形及び点Ｃの電圧波形に生じても、その誤パルスは
無視され、点Ｅの電圧波形及び点Ｆの電圧波形には誤動
作による信号は出てこなくなり、信号線が長いために生
じる１パルスの誤信号を確実に取り除いて、ＡＢＳ変調
信号からデータ信号を正確に復調できる。Therefore, the D flip-flop circuit 4 latches the output signal of the monostable multivibrator 3 at the falling edge of the voltage waveform at the point B and synthesizes the waveform. The output signal of the D flip-flop circuit 4 is A voltage waveform shifted from the output signal of the monostable multivibrator 3 by the next carrier pulse of the ASK modulation signal is obtained.
From the logical condition of the output signal of the monostable multivibrator 3 and the output signal of the D flip-flop circuit 4, a signal less than twice the carrier pulse width of the ASK modulation signal is removed.
The oscillation of the carrier pulse of the SK modulation signal is equal to the carrier pulse width of 2
The time period that lasts twice or more is extracted as a data signal.
As a result, even if an oscillating voltage is generated by the LC and an erroneous pulse caused by an oscillating waveform in the ASK modulation signal is generated in the voltage waveform at the point B and the voltage waveform at the point C, the erroneous pulse is ignored and the point E is ignored. In the voltage waveform of point F and the voltage waveform of point F, a signal due to malfunction does not appear, and an error signal of one pulse caused by a long signal line can be reliably removed, and a data signal can be accurately demodulated from the ABS modulated signal.
【００１３】図３は本発明の具体的構成を示す他の実施
の形態を示し、復調装置は、ＡＢＳ変調信号をパルスト
ランス１１を介して受信し、その受信したＡＢＳ変調信
号をコンパレータ１で波形整形するようにしている。ま
た、コンパレータ１の出力信号を、Ｄフリップフロップ
回路４のクロック入力端子に入力すると共に、単安定マ
ルチバイブレータ３のＱ出力端子からの出力信号を、抵
抗１２及びコンデンサ１３で、コンパレータ１の出力信
号よりもやや遅らせて、Ｄフリップフロップ回路４のＤ
入力端子に入力するようにしている。また、ＯＲ回路８
を、前記ＮＯＲ回路６及びＮＯＴ回路７に代えて、一対
のダイオード１５，１６により構成している。FIG. 3 shows another embodiment showing a specific configuration of the present invention. A demodulator receives an ABS modulated signal via a pulse transformer 11 and converts the received ABS modulated signal into a waveform by a comparator 1. I try to shape it. The output signal of the comparator 1 is input to the clock input terminal of the D flip-flop circuit 4, and the output signal from the Q output terminal of the monostable multivibrator 3 is output by the resistor 12 and the capacitor 13 to the output signal of the comparator 1. A little later than the D flip-flop circuit 4
Input to the input terminal. OR circuit 8
Is constituted by a pair of diodes 15 and 16 instead of the NOR circuit 6 and the NOT circuit 7.
【００１４】その他の点は前記実施の形態の場合と同様
の構成であり、実験データによれば、点Ｂは図４（イ）
に示すような電圧波形になり、点Ｅは図４（ロ）に示す
ような電圧波形になり、前記実施の形態の場合と同様
に、ＡＳＫ変調信号の搬送パルス幅の２倍以下の信号を
取り除いて、ＡＳＫ変調信号の搬送パルスの振動が、搬
送パルス幅の２倍以上続いている期間を、データ信号と
して取り出し、簡単な回路構成で、ＡＢＳ変調信号から
データ信号を正確に復調できるようになる。なお、前記
実施の形態では、ＯＲ回路８を、ＮＯＲ回路６とＮＯＴ
回路７との直列回路又は一対のダイオード１５，１６に
より構成しているが、これに代え、ＯＲ回路８を、図５
に示すようにＮＯＲ回路１８とＮＯＴ回路１９との直列
回路で構成し、又は図６に示すように１つのＯＲ回路に
より構成するようにしてもよい。The other points are the same as those of the above embodiment. According to the experimental data, point B is shown in FIG.
A point E has a voltage waveform as shown in FIG. 4 (b), and a signal having a width not more than twice the carrier pulse width of the ASK modulation signal is obtained as in the case of the above-described embodiment. By removing the period during which the oscillation of the carrier pulse of the ASK modulation signal continues at least twice the width of the carrier pulse as a data signal, a simple circuit configuration can be used to accurately demodulate the data signal from the ABS modulation signal. Become. In the above embodiment, the OR circuit 8 is connected to the NOR circuit 6 and the NOT circuit.
The OR circuit 8 is configured by a series circuit with the circuit 7 or a pair of diodes 15 and 16.
May be configured by a series circuit of a NOR circuit 18 and a NOT circuit 19, or may be configured by one OR circuit as illustrated in FIG.
【００１５】また、前記実施の形態では、単安定マルチ
バイブレータ３は、単安定マルチは、コンパレータ１の
出力信号の立ち下がりで、電圧が立ち下がって、搬送パ
ルスのパルス幅よりやや長い期間までＬ電圧（零又は低
電圧）を保持するように構成されているが、これに代
え、単安定マルチバイブを、コンパレータ１の出力信号
の立ち上がりで動作するように構成してもよい。また、
前記実施の形態では、Ｄフリップフロップ回路４は、コ
ンパレータ１の出力信号の立ち下がりで、単安定マルチ
バイブレータ３の出力信号の電圧波形に切り換わりるよ
うに構成されているが、これに代え、Ｄフリップフロッ
プ回路４を、コンパレータ１の出力信号の立ち上がり
で、単安定マルチバイブレータ３の出力信号の電圧波形
に切り換わりるように構成してもよい。Further, in the above-described embodiment, the monostable multivibrator 3 is configured such that the monostable multivibrator 3 keeps the L level until the voltage falls at the fall of the output signal of the comparator 1 and is slightly longer than the pulse width of the carrier pulse. Although the configuration is such that the voltage (zero or low voltage) is maintained, a monostable multivibrator may be configured to operate at the rising edge of the output signal of the comparator 1 instead. Also,
In the above embodiment, the D flip-flop circuit 4 is configured to switch to the voltage waveform of the output signal of the monostable multivibrator 3 at the fall of the output signal of the comparator 1. The D flip-flop circuit 4 may be configured to switch to the voltage waveform of the output signal of the monostable multivibrator 3 at the rise of the output signal of the comparator 1.
【００１６】[0016]
【発明の効果】本発明によれば、簡単な回路構成で、信
号線が長い等のために生じる１パルスの誤信号を取り除
いて、ＡＢＳ変調信号からデータ信号を正確に復調でき
るようになる。According to the present invention, it is possible to accurately demodulate a data signal from an ABS modulation signal with a simple circuit configuration by removing an erroneous signal of one pulse caused by a long signal line or the like.
【図１】本発明の一実施形態を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
【図２】動作説明用の電圧波形図である。FIG. 2 is a voltage waveform diagram for explaining an operation.
【図３】他の実施の形態を示す回路図である。FIG. 3 is a circuit diagram showing another embodiment.
【図４】動作説明用の電圧波形図である。FIG. 4 is a voltage waveform diagram for explaining an operation.
【図５】ＯＲ回路の他の構成を示す図である。FIG. 5 is a diagram illustrating another configuration of the OR circuit.
【図６】ＯＲ回路の他の構成を示す図である。FIG. 6 is a diagram illustrating another configuration of the OR circuit.
【図７】従来例を示す回路図である。FIG. 7 is a circuit diagram showing a conventional example.
【図８】データ信号及びＡＢＳ変調信号を示す波形図で
ある。FIG. 8 is a waveform diagram showing a data signal and an ABS modulation signal.
【図９】従来例を示す回路図である。FIG. 9 is a circuit diagram showing a conventional example.
【図１０】動作説明用の波形図である。FIG. 10 is a waveform chart for explaining the operation.
【図１１】動作説明用の波形図である。FIG. 11 is a waveform chart for explaining the operation.
１ コンパレータ ３ 単安定マルチバイブレータ ４ Ｄフリップフロップ回路 ６ ＯＲ回路 DESCRIPTION OF SYMBOLS 1 Comparator 3 Monostable multivibrator 4 D flip-flop circuit 6 OR circuit
Claims (3)
るようにしたＡＳＫ変調信号の復調装置において、 ＡＳＫ変調信号の搬送パルスの振動が２個以上連続して
いる期間を、データ信号として復調するようにしたこと
を特徴とするＡＳＫ変調信号の復調装置。1. An ASK modulation signal demodulation apparatus which demodulates a data signal from an ASK modulation signal, wherein a period in which two or more oscillations of a carrier pulse of the ASK modulation signal are continuous is demodulated as a data signal. A demodulation device for an ASK modulation signal, characterized in that:
タ信号を振幅変調したＡＳＫ変調信号を、受信して、そ
の受信したＡＳＫ変調信号からデータ信号を取り出すよ
うにしたＡＳＫ変調信号の復調装置において、 受信したＡＳＫ変調信号を波形整形した後、搬送パルス
幅よりもやや長い時定数をもった単安定マルチバイブレ
ータ（３）に入力し、単安定マルチバイブレータ（３）
の出力信号と、前記ＡＳＫ変調信号を波形整形した信号
とから、ＡＳＫ変調信号の搬送パルス幅の２倍以下の信
号を取り除いて、ＡＳＫ変調信号の搬送パルスの振動
が、搬送パルス幅の２倍以上続いている期間を、データ
信号として取り出すようにしたことを特徴とするＡＳＫ
変調信号の復調装置。2. An ASK-modulated signal demodulating apparatus which receives an ASK-modulated signal obtained by amplitude-modulating a data signal with a carrier having a carrier pulse having a predetermined width and extracts a data signal from the received ASK-modulated signal. After shaping the waveform of the received ASK modulated signal, the signal is input to a monostable multivibrator (3) having a time constant slightly longer than the carrier pulse width, and the monostable multivibrator (3)
Of the ASK-modulated signal and the signal obtained by shaping the waveform of the ASK-modulated signal, a signal having a width not larger than twice the carrier-pulse width of the ASK-modulated signal is removed, so that the oscillation of the carrier pulse of the ASK-modulated signal becomes twice the carrier-pulse width. ASK characterized in that a period continuing as described above is taken out as a data signal.
Modulation signal demodulation device.
タ信号を振幅変調したＡＳＫ変調信号を、受信して、そ
の受信したＡＳＫ変調信号からデータ信号を取り出すよ
うにしたＡＳＫ変調信号の復調装置において、 受信したＡＳＫ変調信号を、波形整形した後、搬送パル
ス幅よりやや長い時定数をもった単安定マルチバイブレ
ータ（３）に入力し、単安定マルチバイブレータ（３）
の出力信号と、前記受信したＡＳＫ変調信号を波形整形
した信号とから、単安定マルチバイブレータ（３）の出
力信号よりも、ＡＳＫ変調信号の次の搬送パルス分だけ
ずれた出力信号を取り出すＤフリップフロップ回路４が
設けられ、前記単安定マルチバイブレータ（３）の出力
信号とＤフリップフロップ回路（４）の出力信号との論
理条件から、ＡＳＫ変調信号の搬送パルス幅の２倍以下
の信号を取り除いて、ＡＳＫ変調信号の搬送パルスの振
動が、搬送パルス幅の２倍以上続いている期間を、デー
タ信号として取り出すようにしたことを特徴とするＡＳ
Ｋ変調信号の復調装置。3. An ASK-modulated signal demodulating apparatus for receiving an ASK-modulated signal obtained by amplitude-modulating a data signal with a carrier having a carrier pulse having a predetermined width and extracting the data signal from the received ASK-modulated signal. After shaping the waveform of the received ASK modulation signal, the signal is input to a monostable multivibrator (3) having a time constant slightly longer than the carrier pulse width, and the monostable multivibrator (3)
D flip-flop that extracts an output signal that is shifted from the output signal of the monostable multivibrator (3) by the next carrier pulse of the ASK modulation signal from the output signal of the ASK modulation signal and the signal obtained by shaping the waveform of the received ASK modulation signal. And a signal that is less than twice the carrier pulse width of the ASK modulated signal is removed from the logical condition of the output signal of the monostable multivibrator (3) and the output signal of the D flip-flop circuit (4). A period in which the oscillation of the carrier pulse of the ASK modulation signal continues at least twice the carrier pulse width as a data signal.
Demodulator for K-modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001022466A JP4393000B2 (en) | 2001-01-30 | 2001-01-30 | ASK modulation signal demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001022466A JP4393000B2 (en) | 2001-01-30 | 2001-01-30 | ASK modulation signal demodulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002232495A true JP2002232495A (en) | 2002-08-16 |
| JP4393000B2 JP4393000B2 (en) | 2010-01-06 |
Family
ID=18887879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001022466A Expired - Fee Related JP4393000B2 (en) | 2001-01-30 | 2001-01-30 | ASK modulation signal demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4393000B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7508257B2 (en) * | 2006-09-06 | 2009-03-24 | Winbond Electronics Corporation | Low-power digital demodulator |
| US7676003B2 (en) | 2006-09-06 | 2010-03-09 | Winbond Electronics Corporation | Carrier frequency-independent receiver |
| US7738792B2 (en) | 2007-07-24 | 2010-06-15 | Winbond Electronics Corporation | Multi-protocol infrared receiver |
| US7885359B2 (en) | 2007-08-15 | 2011-02-08 | Seiko Epson Corporation | Sampling demodulator for amplitude shift keying (ASK) radio receiver |
-
2001
- 2001-01-30 JP JP2001022466A patent/JP4393000B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7508257B2 (en) * | 2006-09-06 | 2009-03-24 | Winbond Electronics Corporation | Low-power digital demodulator |
| US7676003B2 (en) | 2006-09-06 | 2010-03-09 | Winbond Electronics Corporation | Carrier frequency-independent receiver |
| US7738792B2 (en) | 2007-07-24 | 2010-06-15 | Winbond Electronics Corporation | Multi-protocol infrared receiver |
| US7885359B2 (en) | 2007-08-15 | 2011-02-08 | Seiko Epson Corporation | Sampling demodulator for amplitude shift keying (ASK) radio receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4393000B2 (en) | 2010-01-06 |
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