JPH1022974A - Demodulator for am data multiplexed and modulated wave signal - Google Patents
Demodulator for am data multiplexed and modulated wave signalInfo
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- JPH1022974A JPH1022974A JP8195234A JP19523496A JPH1022974A JP H1022974 A JPH1022974 A JP H1022974A JP 8195234 A JP8195234 A JP 8195234A JP 19523496 A JP19523496 A JP 19523496A JP H1022974 A JPH1022974 A JP H1022974A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＡＭデータ多重変
調装置によって生成されたＡＭデータ多重被変調波信号
中から、ベースバンドデジタル信号を取り出すＡＭデー
タ多重被変調波信号復調装置に関し、さらに詳細には、
本特許出願人が提案している、アナログ信号波で周波数
ｆｃの搬送波をＡＭ変調器によって振幅変調し、周波数
軸上で周波数ｆｃの搬送波を軸として線対称な周波数
（ｆｃ＋ｆα）の位置と周波数（ｆｃ−ｆα）の位置と
に、デジタル被変調波信号が多重されたＡＭデータ多重
被変調波信号からベースバンドデジタル信号を取り出す
ＡＭデータ多重被変調波信号復調装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AM data multiplexed modulated wave signal demodulator for extracting a baseband digital signal from an AM data multiplexed modulated wave signal generated by an AM data multiplexing modulator. Is
A carrier having a frequency fc, which is proposed by the present applicant, is amplitude-modulated by an AM modulator using an analog signal wave. fc-fα) and an AM data multiplexed modulated wave signal demodulation apparatus for extracting a baseband digital signal from an AM data multiplexed modulated wave signal in which a digital modulated wave signal is multiplexed.
【０００２】[0002]
【従来の技術】従来のデータ多重被変調波信号復調方式
は、変調方式が時分割多重方式の場合、または周波数多
重方式の場合に大別される。時分割方式の場合はデータ
が多重されている時間を選択して希望のデータを取り出
し、周波数多重方式の場合はデータが多重されている周
波数帯域を選択して希望のデータを取り出す。2. Description of the Related Art Conventional data multiplexed modulated wave signal demodulation methods are roughly classified into a time division multiplexing method and a frequency multiplexing method. In the case of the time-division method, the time at which data is multiplexed is selected to extract desired data. In the case of the frequency multiplexing method, the frequency band in which data is multiplexed is selected to extract desired data.
【０００３】[0003]
【発明が解決しようとする課題】しかし、アナログ信号
波で周波数ｆｃの搬送波をＡＭ変調器によって振幅変調
し、周波数軸上で周波数ｆｃの搬送波を軸として線対称
な周波数（ｆｃ＋ｆα）の位置と周波数（ｆｃ−ｆα）
の位置とに、デジタル被変調波信号が多重されたＡＭデ
ータ多重変調方式ではＡＭ信号とデータ信号が同一周波
数帯域、同一時間に多重されているため、周波数軸、時
間軸双方ともデータのみを選択することができない。However, a carrier having a frequency fc is amplitude-modulated by an AM signal using an analog signal wave, and the position and frequency of a frequency (fc + fα) that is line-symmetric on the frequency axis with the carrier having the frequency fc as an axis. (Fc-fα)
In the AM data multiplexing modulation method where the digital modulated wave signal is multiplexed at the position of, the AM signal and the data signal are multiplexed in the same frequency band and the same time, so only data is selected on both the frequency axis and the time axis. Can not do it.
【０００４】本発明は、多重されたデジタル被変調波信
号に基づくベースバンドデジタル信号をＡＭデータ多重
被変調波信号から復調するＡＭデータ多重被変調波信号
復調装置を提供することを目的とする。An object of the present invention is to provide an AM data multiplexed modulated wave signal demodulator for demodulating a baseband digital signal based on a multiplexed digital modulated wave signal from an AM data multiplexed modulated wave signal.
【０００５】[0005]
【課題を解決するための手段】本発明にかかるＡＭデー
タ多重被変調波信号復調装置は、アナログ信号波で周波
数ｆｃの搬送波をＡＭ変調器によって振幅変調し、周波
数軸上で周波数ｆｃの搬送波を軸として線対称な周波数
（ｆｃ＋ｆα）の位置と周波数（ｆｃ−ｆα）の位置と
に、デジタル被変調波信号が多重されたＡＭデータ多重
被変調波信号からベースバンドデジタル信号を復調する
ＡＭデータ多重被変調波信号復調装置であって、ＡＭデ
ータ多重被変調波信号を周波数（ｆｃ＋ｆα）の信号で
直交検波する第１の直交検波器と、前記ＡＭデータ多重
被変調波信号を周波数（ｆｃ−ｆα）の信号で直交検波
する第２の直交検波器と、第１の直交検波器からのＩ信
号成分と第２の直交検波器からのＩ信号との差を演算す
る第１の演算手段と、第１の直交検波器からのＱ信号成
分と第２の直交検波器からのＱ信号との和を演算する第
２の演算手段とを備えたことを特徴とする。According to the present invention, an AM data multiplexed modulated wave signal demodulator according to the present invention amplitude-modulates a carrier having a frequency fc with an analog signal wave by an AM modulator, and converts the carrier having a frequency fc on a frequency axis. AM data multiplexing in which a digital modulated wave signal is multiplexed at a position of a frequency (fc + fα) and a position of a frequency (fc−fα) which are line-symmetrical with respect to an axis. AM data multiplexing for demodulating a baseband digital signal from a modulated wave signal. A modulated wave signal demodulation device, comprising: a first quadrature detector for orthogonally detecting an AM data multiplexed modulated wave signal with a signal having a frequency (fc + fα); A) a second quadrature detector that performs quadrature detection with the signal of (1), and first calculation means that calculates the difference between the I signal component from the first quadrature detector and the I signal from the second quadrature detector. Characterized by comprising a second calculating means for calculating the sum of the Q signal from the 1 Q signal component and a second quadrature detector from the quadrature detector of.
【０００６】本発明にかかるＡＭデータ多重被変調波信
号復調装置によれば、周波数軸上で周波数ｆｃの搬送波
を軸として線対称な周波数（ｆｃ＋ｆα）の位置と周波
数（ｆｃ−ｆα）の位置とにデジタル被変調波信号が多
重されたＡＭデータ多重被変調波信号が周波数（ｆｃ＋
ｆα）の信号で第１の直交検波器によって直交検波さ
れ、かつ周波数（ｆｃ−ｆα）の信号で第２の直交検波
器によって直交検波される。両直交検波出力中のＩ信号
の差が第１の演算手段によって演算され、Ｑ信号の和が
第２の演算手段によって演算されて、この過程において
振幅変調成分が打ち消され、多重されたデータであるベ
ースバンドデジタル信号が得られる。According to the AM data multiplexed modulated wave signal demodulating apparatus according to the present invention, the position of the frequency (fc + fα) and the position of the frequency (fc−fα) are symmetric with respect to the carrier of the frequency fc on the frequency axis. The AM data multiplexed modulated wave signal in which the digital modulated wave signal is multiplexed into the
fα) is subjected to quadrature detection by the first quadrature detector, and is subjected to quadrature detection by the second quadrature detector using the signal of frequency (fc−fα). The difference between the I signals in the two quadrature detection outputs is calculated by the first calculating means, and the sum of the Q signals is calculated by the second calculating means. In this process, the amplitude modulation component is canceled and the multiplexed data is used. A certain baseband digital signal is obtained.
【０００７】[0007]
【発明の実施の形態】本発明にかかるＡＭデータ多重被
変調波信号復調装置を実施の一形態によって説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An AM data multiplexed modulated wave signal demodulator according to the present invention will be described with reference to an embodiment.
【０００８】図１は本発明の実施の一形態にかかるＡＭ
データ多重被変調波信号復調装置の構成を示すブロック
図である。図１に示す本発明の実施の一形態にかかるＡ
Ｍデータ多重被変調波信号復調装置は、デジタル変調方
式にＱＰＳＫ（４相ＰＳＫ）変調方式を用いたときの一
例である。FIG. 1 shows an AM according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a data multiplexed modulated wave signal demodulation device. A according to the embodiment of the present invention shown in FIG.
The M data multiplexed modulated wave signal demodulation device is an example when a QPSK (four-phase PSK) modulation method is used as a digital modulation method.
【０００９】本発明の実施の一形態にかかるＡＭデータ
多重被変調波信号復調装置は、周波数（ｆｃ＋ｆα）の
信号でＡＭ多重被変調波信号を直交検波する直交検波器
１と、周波数（ｆｃ−ｆα）の信号でＡＭ多重被変調波
信号を直交検波する直交検波器２と、直交検波器１から
出力されるＩ信号成分と直交検波器２から出力されるＱ
信号成分との差を演算する減算器３と、直交検波器１か
ら出力されるＱ信号成分と直交検波器２から出力される
Ｉ信号成分との和を演算する加算器４と、減算器３から
の出力中の高域成分を除去するローパスフィルタ５と、
加算器４からの出力中の高域成分を除去するローパスフ
ィルタ６とから構成してある。An AM data multiplexed modulated wave signal demodulation apparatus according to one embodiment of the present invention comprises a quadrature detector 1 for orthogonally detecting an AM multiplexed modulated wave signal with a signal of a frequency (fc + fα), and a frequency (fc− fα), a quadrature detector 2 for quadrature detection of the AM-multiplexed modulated wave signal, an I signal component output from the quadrature detector 1 and a Q output from the quadrature detector 2
A subtracter 3 for calculating the difference between the signal components; an adder 4 for calculating the sum of the Q signal component output from the quadrature detector 1 and the I signal component output from the quadrature detector 2; A low-pass filter 5 for removing high-frequency components in the output from
And a low-pass filter 6 for removing high-frequency components in the output from the adder 4.
【００１０】上記のように構成された本発明の実施の一
形態にかかるＡＭデータ多重被変調波信号復調装置の作
用について説明する。The operation of the AM data multiplexed modulated wave signal demodulating apparatus according to the embodiment of the present invention configured as described above will be described.
【００１１】復調の説明に先立って、直交検波器１およ
び２に供給されるＡＭデータ多重被変調波信号について
説明する。Prior to the description of demodulation, an AM data multiplexed modulated wave signal supplied to quadrature detectors 1 and 2 will be described.
【００１２】搬送波を信号波で変調したときのＡＭ被変
調波信号νAM(t)は、搬送波の振幅を１、搬送波の角周
波数をωc(rad/s)、変調度をκ、信号波をνm(t)とする
と、下記の式（１）のように表わされる。An AM modulated wave signal νAM (t) obtained by modulating a carrier with a signal wave has a carrier amplitude of 1, a carrier angular frequency of ωc (rad / s), a modulation factor of κ, and a signal wave of νm. If (t) is used, it is represented as the following equation (1).
【００１３】 νAM(t)＝｛１＋κνm(t)｝cos ωc t ……式（１）ΝAM (t) = ｛1 + κνm (t)｝ cos ωct t Equation (1)
【００１４】ＱＰＳＫベースバンドデジタル信号発生器
で発生したＩ、Ｑのデジタル信号列をＩn、Ｑnで表す。
Ｉｎ、Ｑｎのデジタル信号列をダイビットとも記す。こ
こで、 Ｉn＝±１ Ｑn＝±１ とする。The digital signal sequence of I and Q generated by the QPSK baseband digital signal generator is represented by In and Qn.
The digital signal sequence of In and Qn is also referred to as a dibit. Here, it is assumed that In = ± 1 and Qn = ± 1.
【００１５】ＱＰＳＫベースバンドデジタル信号発生器
からの出力信号は２つに分岐され、その一方は周波数
（ｆｃ＋ｆα）の搬送波が供給されている直交変調器に
入力されて、複素信号列で角周波数（ωc＋ωα）（rad
/s)の搬送波を直交変調する。この直交被変調波信号νD
H(t)は下記の式（２）に示す如くである。The output signal from the QPSK baseband digital signal generator is split into two, one of which is input to a quadrature modulator to which a carrier having a frequency (fc + fα) is supplied. ωc + ωα) (rad
/ s) is orthogonally modulated. This quadrature modulated wave signal νD
H (t) is as shown in the following equation (2).
【００１６】 νDH(t)＝Ｉn cos(ωc＋ωα）ｔ＋Ｑn sin（ωc＋ωα）ｔ …式（２）ΝDH (t) = In cos (ωc + ωα) t + Qn sin (ωc + ωα) t Equation (2)
【００１７】ＱＰＳＫベースバンドデジタル信号発生器
からの出力信号のもう一方は、符号反転器に供給され
て、出力信号Ｉn、Ｑnの符号は反転されて（−Ｉn）、
（−Ｑn）に変換され、複素共役器によって複素共役が
とられて（−Ｉn）、（Ｑn）に変換される。この複素信
号列が、周波数（ｆｃ−ｆα）の搬送波が供給されてい
る直交変調器に入力され、複素信号列で角周波数（ωc
−ωα）（rad/s)の搬送波を直交変調する。この直交被
変調波信号νDL(t)は下記の式（３）に示す如くであ
る。The other of the output signals from the QPSK baseband digital signal generator is supplied to a sign inverter, and the signs of the output signals In and Qn are inverted (−In),
It is converted to (-Qn), complex-conjugated by a complex conjugator, and converted to (-In) and (Qn). This complex signal sequence is input to a quadrature modulator to which a carrier having a frequency (fc−fα) is supplied.
−ωα) (rad / s) is subjected to quadrature modulation. This quadrature modulated wave signal νDL (t) is as shown in the following equation (3).
【００１８】 νDL(t)＝−Ｉn cos（ωc−ωα）ｔ＋Ｑn sin（ωc−ωα）ｔ …式（３）ΝDL (t) = − In cos (ωc−ωα) t + Qn sin (ωc−ωα) t Equation (3)
【００１９】式（２）および式（３）の出力信号νDH
(t)とνDL(t)が加算され、その加算出力であるデジタル
被変調波信号νD(t)は下記の式（４）に示すごとくにな
る。The output signal νDH of the equations (2) and (3)
(t) and νDL (t) are added, and the digital modulated wave signal νD (t), which is the added output, is as shown in the following equation (4).
【００２０】 νD(t)＝νDH(t)＋νDL(t) ＝Ｉn cos(ωc＋ωα)ｔ＋Ｑn sin(ωc＋ωα)ｔ −Ｉn cos(ωc−ωα)ｔ＋Ｑn sin(ωc−ωα)ｔ ……式（４）ΝD (t) = νDH (t) + νDL (t) = Incos (ωc + ωα) t + Qn sin (ωc + ωα) t−Incos (ωc−ωα) t + Qn sin (ωc−ωα) t (4)
【００２１】ＡＭ被変調波信号νAM(t)とデジタル被変
調波信号νD(t)は加算され、加算出力信号はＡＭデータ
多重被変調波信号として出力される。このＡＭデータ多
重被変調波信号ν(t)は式（１）および式（４）より下
記の式（５）に示すごとくになる。The AM modulated wave signal νAM (t) and the digital modulated wave signal νD (t) are added, and the added output signal is output as an AM data multiplexed modulated wave signal. The AM data multiplexed modulated wave signal ν (t) is as shown in the following equation (5) from the equations (1) and (4).
【００２２】 ν(t)＝νAM(t)＋νD(t) ＝｛１＋κνm(t)｝cos ωc ｔ ＋Ｉn cos（ωc＋ωα）ｔ＋Ｑn sin（ωc＋ωα）ｔ −Ｉn cos（ωc−ωα）ｔ＋Ｑn sin（ωc−ωα）ｔ ……式（５）Ν (t) = νAM (t) + νD (t) = ｛1 + κνm (t)｝ cos ωct + Incos (ωc + ωα) t + Qn sin (ωc + ωα) t−Incos (ωc−ωα) t + Qn sin (ωc− ωα) t ... Equation (5)
【００２３】ωαはデジタル変調搬送波とＡＭ変調搬送
波との差の角周波数（rad/s)である。式（５）にて示さ
れるＡＭデータ多重被変調波信号が直交検波器１および
２に入力される。Ωα is the angular frequency (rad / s) of the difference between the digitally modulated carrier and the AM modulated carrier. The AM data multiplexed modulated wave signal represented by the equation (5) is input to quadrature detectors 1 and 2.
【００２４】直交検波器１における直交検波のために、
式（５）のＡＭ多重被変調波信号ν(t)にcos（ωｃ＋ω
α）ｔとsin（ωｃ＋ωα）ｔが直交検波器１において
乗算される。この乗算出力はそれぞれ式（６）（Ｉ出
力）および式（７）（Ｑ出力）に示すごとくになる。For quadrature detection in the quadrature detector 1,
The cos (ωc + ω) is added to the AM multiplexed modulated wave signal ν (t) in the equation (5).
α) t and sin (ωc + ωα) t are multiplied in the quadrature detector 1. The multiplied outputs are as shown in equations (6) (I output) and (7) (Q output).
【００２５】 ２｛ν(t) cos（ωｃ＋ωα）ｔ｝ ＝｛１＋κνm(t)｝cos（−ωα）ｔ＋Ｉn cos ０＋Ｑn sin ０ −Ｉn cos（−２ωα）ｔ＋Ｑn sin（−２ωα）ｔ ＋｛１＋κνm(t)｝cos（２ωｃ＋ωα）ｔ ＋Ｉn cos２（ωｃ＋ωα）ｔ＋Ｑn sin２（ωｃ＋ωα）ｔ −Ｉn cos２ωｃ ｔ＋Ｑn sin２ωｃ ｔ ……式（６）2 ｛ν (t) cos (ωc + ωα) t｝ = {1 + κνm (t)｝ cos (−ωα) t + In cos 0 + Qn sin 0 −In cos (−2ωα) t + Qn sin (−2ωα) t + ｛1 + κνm ( t)｝ cos (2ωc + ωα) t + Incos2 (ωc + ωα) t + Qn sin2 (ωc + ωα) t−Incos2ωct + Qn sin2ωct t Equation (6)
【００２６】 ２｛ν(t) sin（ωｃ＋ωα）ｔ｝ ＝−｛１＋κνm(t)｝sin（−ωα）ｔ−Ｉn sin ０＋Ｑn cos ０ ＋Ｉn sin（−２ωα）ｔ＋Ｑn cos（−２ωα）ｔ ＋｛１＋κνm(t)｝sin（２ωｃ＋ωα）ｔ ＋Ｉn sin２（ωｃ＋ωα）ｔ−Ｑn cos２（ωｃ＋ωα）ｔ −Ｉn sin２ωｃ ｔ−Ｑn cos２ωｃ ｔ ……式（７）2 {ν (t) sin (ωc + ωα) t} = − {1 + κνm (t)} sin (−ωα) t−In sin 0 + Qn cos 0 + In sin (−2ωα) t + Qn cos (−2ωα) t + 1 + κνm (t)｝ sin (2ωc + ωα) t + Insin2 (ωc + ωα) t-Qncos2 (ωc + ωα) t-Insin2ωct t-Qncos2ωct t Equation (7)
【００２７】直交検波器２における直交検波のために、
式（５）のＡＭ多重被変調波信号ν(t)にcos（ωｃ−ω
α）ｔとsin（ωｃ−ωα）ｔが直交検波器２において
乗算される。この乗算出力はそれぞれ式（８）（Ｉ出
力）および式（９）（Ｑ出力）に示すごとくになる。For quadrature detection in the quadrature detector 2,
The cos (ωc−ω) is added to the AM multiplexed modulated wave signal ν (t) in the equation (5).
α) t and sin (ωc−ωα) t are multiplied in the quadrature detector 2. The multiplied outputs are as shown in equations (8) (I output) and (9) (Q output).
【００２８】 ２｛ν(t) cos（ωｃ−ωα）ｔ｝ ＝｛１＋κνm(t)｝cos ωα ｔ＋Ｉn cos ２ωα ｔ＋Ｑn sin ２ωα ｔ −Ｉn cos ０＋Ｑn sin ０＋｛１＋κνm(t)｝cos（２ωｃ−ωα）ｔ ＋Ｉn cos ２ωα ｔ＋Ｑn sin２ ωα ｔ−Ｉn cos２（ωｃ−ωα）ｔ ＋Ｑn sin２（ωｃ−ωα）ｔ ……式（８）2 ｛ν (t) cos (ωc−ωα) t｝ = {1 + κνm (t)｝ cosωαt + Incos2ωαt + Qnsin2ωαt−Incos0 + Qnsin0 + ｛1 + κνm (t)｝ cos (2ωc−ωα ) T + Incos 2ωα t + Qn sin2 ωα t−Incos2 (ωc−ωα) t + Qn sin2 (ωc−ωα) t (8)
【００２９】 ２｛ν(t) sin（ωｃ−ωα）ｔ｝ ＝−｛１＋κνm(t)｝sin ωα ｔ−Ｉn sin ２ωα ｔ＋Ｑn cos ２ωα ｔ ＋Ｉn sin ０＋Ｑn cos ０＋｛１＋κνm(t)｝sin（２ωｃ−ωα）ｔ ＋Ｉn sin ２ωα ｔ−Ｑn cos ２ωα ｔ−Ｉn sin２（ωｃ−ωα）ｔ −Ｑn cos２（ωｃ−ωα）ｔ ……式（９）2 ｛ν (t) sin (ωc−ωα) t｝ = − {1 + κνm (t)｝ sin ωαt−Insin 2ωαt + Qncos 2ωαt + Insin0 + Qncos0 + ｛1 + κνm (t)｝ sin (2ωc −ωα) t + In sin 2ωα t−Qn cos 2ωα t−In sin2 (ωc−ωα) t −Qn cos2 (ωc−ωα) t (Equation (9))
【００３０】減算器３には式（６）と式（８）とが入力
されて、式（６）から式（８）が減算される。加算器４
には式（７）と式（９）とが入力されて、加算される。
sin０＝０、cos ０＝１、sin（−ｘ）＝−sin ｘ、cos
（−ｘ）＝cos ｘの関係を用いて、減算器３からの出力
は式（１０）に示すごとくになり、加算器４からの出力
は式（１１）に示すごとくになる。Equations (6) and (8) are input to the subtractor 3, and equation (8) is subtracted from equation (6). Adder 4
Equations (7) and (9) are input to and added.
sin0 = 0, cos0 = 1, sin (-x) =-sinx, cos
Using the relationship of (−x) = cos x, the output from the subtractor 3 is as shown in Expression (10), and the output from the adder 4 is as shown in Expression (11).
【００３１】 ν(t) cos（ωｃ＋ωα）ｔ−ν(t) cos（ωｃ−ωα）ｔ ＝Ｉn−Ｉn cos２ωα ｔ−Ｑn sin２ωα ｔ−Ｉn cos２ωｃ ｔ ＋１／２｛Ｉn cos２（ωｃ＋ωα）ｔ＋Ｑn sin２（ωｃ＋ωα）ｔ ＋Ｉn cos２（ωｃ＋ωα）ｔ−Ｑn sin２（ωｃ＋ωα）ｔ｝……式（１０）Ν (t) cos (ωc + ωα) t−ν (t) cos (ωc−ωα) t = In−Incos2ωαt−Qn sin2ωα t−Incos2ωct + 1/2 ｛Incos2 (ωc + ωα) t + Qn sin2 ( ωc + ωα) t + In cos2 (ωc + ωα) t−Qn sin2 (ωc + ωα) t｝ (10)
【００３２】 ν(t) sin（ωｃ＋ωα）ｔ＋ν(t) sin（ωｃ −ωα）ｔ ＝Ｑn−Ｉn sin２ωα ｔ＋Ｑn cos２ωα ｔ−Ｑn cos２ωｃ ｔ ＋１／２｛Ｉn sin２（ωｃ ＋ωα）ｔ−Ｑn cos２（ωｃ＋ωα）ｔ −Ｉn sin２（ωｃ＋ωα）ｔ−Ｑn cos２（ωｃ＋ωα）ｔ｝……式（１１）Ν (t) sin (ωc + ωα) t + ν (t) sin (ωc−ωα) t = Qn−Insin2ωαt + Qncos2ωαt−Qncos2ωct + 1/2 ｛Insin2 (ωc + ωα) t−Qncos2 (ωc + ωα ) T−In sin2 (ωc + ωα) t−Qn cos2 (ωc + ωα) t｝ (11)
【００３３】ここで、式（１０）および式（１１）中に
｛１＋κνm(t)｝の項が存在しないことから、直交検波
および加減算の過程において振幅変調成分が打ち消され
ていることが分かる。Here, since there is no term of {1 + κνm (t)} in the equations (10) and (11), it can be seen that the amplitude modulation component is canceled in the process of the quadrature detection and the addition / subtraction.
【００３４】減算器３からの出力はローパスフィルタ５
に供給されて高域成分が除去されて、デジタル復調信号
（Ｉ）をＩDEMOD とおき、加算器４からの出力はローパ
スフィルタ６に供給されて高域成分が除去されて、デジ
タル復調信号（Ｑ）をＱDEMOD とおくと、ローパスフィ
ルタ５からの出力は下記の式（１２）のようになり、ロ
ーパスフィルタ６からの出力は下記の式（１３）のよう
になって、ＡＭデータ多重被変調波信号に多重されたデ
ータすなわちベースバンドデジタル信号を、ＡＭデータ
多重被変調波信号から復調することができる。The output from the subtractor 3 is a low-pass filter 5
The digital demodulated signal (I) is set to IDEMOD after the high-frequency component is removed, and the output from the adder 4 is supplied to the low-pass filter 6 to remove the high-frequency component, and the digital demodulated signal (Q ) Is QDEMOD, the output from the low-pass filter 5 is given by the following equation (12), and the output from the low-pass filter 6 is given by the following equation (13). The data multiplexed on the signal, that is, the baseband digital signal can be demodulated from the AM data multiplexed modulated wave signal.
【００３５】 ＩDEMOD＝Ｉn ……式（１２） ＱDEMOD＝Ｑn ……式（１３）IDEMOD = In Equation (12) QDEMOD = Qn Equation (13)
【００３６】上記した本発明の実施の一形態にかかるＡ
Ｍデータ多重被変調波信号復調装置においては、減算器
３、加算器４の出力をローパスフィルタ５、６に供給し
た場合を例示したが、ローパスフィルタを直交検波器
１、２の入力側に設けてもよい。A according to the embodiment of the present invention described above.
In the M data multiplexed modulated wave signal demodulation device, the case where the outputs of the subtractor 3 and the adder 4 are supplied to the low-pass filters 5 and 6 has been illustrated, but the low-pass filter is provided on the input side of the quadrature detectors 1 and 2. You may.
【００３７】上記した本発明の実施の一形態にかかるＡ
Ｍデータ多重被変調波信号復調装置においては、実際
上、同期検波を行っているが、ＡＭデータ多重変調側で
データの差動符号化を行っていれば、ローパスフィルタ
の出力側に遅延検波器を接続することによって遅延検波
方式にすることもできる。A according to the embodiment of the present invention described above
In the M data multiplexed modulated wave signal demodulation apparatus, synchronous detection is actually performed. However, if data is differentially encoded on the AM data multiplex modulation side, a delay detector is provided on the output side of the low-pass filter. , It is possible to use a differential detection method.
【００３８】上記した本発明の実施の一形態にかかるＡ
Ｍデータ多重被変調波信号復調装置においては、ＱＰＳ
Ｋのデータ変調方式の場合を例示したが、ＡＭデータ多
重変調側で他のデータ変調方式を用いたときは、それに
合わせて復調方式をかえなければよい。A according to the embodiment of the present invention described above.
In the M data multiplexed modulated wave signal demodulator, QPS
Although the case of the K data modulation method has been exemplified, when another data modulation method is used on the AM data multiplex modulation side, the demodulation method need not be changed in accordance with the data modulation method.
【００３９】[0039]
【発明の効果】以上説明したように本発明にかかるＡＭ
データ多重被変調波信号復調装置によれば、ベースバン
ドデジタル信号の復調に、直交検波器、加算器および加
算器を用いることで、同時に振幅変調成分を打ち消すこ
とができて、ＡＭデータ多重被変調波信号復調装置の構
成は簡単ですみ、規模を小型化することができるという
効果がある。As described above, the AM according to the present invention is described.
According to the data multiplexed modulated wave signal demodulation device, by using a quadrature detector, an adder and an adder to demodulate a baseband digital signal, the amplitude modulation component can be canceled at the same time, and the AM data multiplexed modulated The configuration of the wave signal demodulation device is simple, and the size can be reduced.
【図１】本発明の実施の一形態にかかるＡＭデータ多重
被変調波信号復調装置の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of an AM data multiplexed modulated wave signal demodulator according to an embodiment of the present invention.
１および２ 直交検波器 ３ 減算器 ４ 加算器 ５および６ ローパスフィルタ 1 and 2 Quadrature detector 3 Subtractor 4 Adder 5 and 6 Low-pass filter
Claims (1)
Ｍ変調器によって振幅変調し、周波数軸上で周波数ｆｃ
の搬送波を軸として線対称な周波数（ｆｃ＋ｆα）の位
置と周波数（ｆｃ−ｆα）の位置とに、デジタル被変調
波信号が多重されたＡＭデータ多重被変調波信号からベ
ースバンドデジタル信号を復調するＡＭデータ多重被変
調波信号復調装置であって、ＡＭデータ多重被変調波信
号を周波数（ｆｃ＋ｆα）の信号で直交検波する第１の
直交検波器と、前記ＡＭデータ多重被変調波信号を周波
数（ｆｃ−ｆα）の信号で直交検波する第２の直交検波
器と、第１の直交検波器からのＩ信号成分と第２の直交
検波器からのＩ信号との差を演算する第１の演算手段
と、第１の直交検波器からのＱ信号成分と第２の直交検
波器からのＱ信号との和を演算する第２の演算手段とを
備えたことを特徴とするＡＭデータ多重被変調波信号復
調装置。An analog signal wave having a frequency fc and a carrier wave of A
The amplitude is modulated by the M modulator, and the frequency fc on the frequency axis
The baseband digital signal is demodulated from the AM data multiplexed modulated wave signal in which the digital modulated wave signal is multiplexed at the position of the frequency (fc + fα) and the position of the frequency (fc−fα) which are symmetrical with respect to the carrier wave of the axis. An AM data multiplexed modulated wave signal demodulation device, comprising: a first quadrature detector for orthogonally detecting an AM data multiplexed modulated wave signal with a signal having a frequency (fc + fα); fc-fα), a first quadrature detector that performs quadrature detection with a signal, and a first calculation that calculates a difference between an I signal component from the first quadrature detector and an I signal from the second quadrature detector. Means for calculating the sum of the Q signal component from the first quadrature detector and the Q signal from the second quadrature detector. Wave signal demodulator.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08195234A JP3088292B2 (en) | 1996-07-08 | 1996-07-08 | AM data multiplexed modulated wave signal demodulator |
| MYPI97003085A MY116925A (en) | 1996-07-08 | 1997-07-07 | Apparatus for demodulating am data multiplexed modulated wave signal |
| CN97111978A CN1102304C (en) | 1996-07-08 | 1997-07-07 | AM data multiple modulation wave signal demodulator |
| US08/889,575 US5970046A (en) | 1996-07-08 | 1997-07-08 | Apparatus for demodulating AM data multiplexed modulated wave signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08195234A JP3088292B2 (en) | 1996-07-08 | 1996-07-08 | AM data multiplexed modulated wave signal demodulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1022974A true JPH1022974A (en) | 1998-01-23 |
| JP3088292B2 JP3088292B2 (en) | 2000-09-18 |
Family
ID=16337723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08195234A Expired - Fee Related JP3088292B2 (en) | 1996-07-08 | 1996-07-08 | AM data multiplexed modulated wave signal demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3088292B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998057470A1 (en) * | 1997-06-13 | 1998-12-17 | Kabushiki Kaisha Kenwood | Clock regeneration circuit |
-
1996
- 1996-07-08 JP JP08195234A patent/JP3088292B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998057470A1 (en) * | 1997-06-13 | 1998-12-17 | Kabushiki Kaisha Kenwood | Clock regeneration circuit |
| US6744839B1 (en) | 1997-06-13 | 2004-06-01 | Kabushiki Kaisha Kenwood | Clock regeneration circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3088292B2 (en) | 2000-09-18 |
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