JPH0754926B2 - Narrowband confidential communication method - Google Patents

Narrowband confidential communication method

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Publication number
JPH0754926B2
JPH0754926B2 JP62112620A JP11262087A JPH0754926B2 JP H0754926 B2 JPH0754926 B2 JP H0754926B2 JP 62112620 A JP62112620 A JP 62112620A JP 11262087 A JP11262087 A JP 11262087A JP H0754926 B2 JPH0754926 B2 JP H0754926B2
Authority
JP
Japan
Prior art keywords
nts
signal
component
phase
quadrature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP62112620A
Other languages
Japanese (ja)
Other versions
JPS63279630A (en
Inventor
清仁 徳田
拓朗 佐藤
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP62112620A priority Critical patent/JPH0754926B2/en
Publication of JPS63279630A publication Critical patent/JPS63279630A/en
Publication of JPH0754926B2 publication Critical patent/JPH0754926B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、有線通信または無線通信において通信の秘話
性を保持するための秘話通信方法に関するものである。
TECHNICAL FIELD The present invention relates to a confidential communication method for maintaining confidentiality of communication in wired communication or wireless communication.

(従来の技術) 従来の秘話通信装置の一構成例が、文献「特開昭61−19
8839号公報」に開示されている。
(Prior Art) An example of the configuration of a conventional confidential communication device is disclosed in a document “JP-A-61-19”.
No. 8839).

この文献に基づく方向を要約すれば秘話信号を得るため
に送信側で音声信号を音声帯域外のSSBに変換した後N
分周して再び音声帯域内の分周波に変換すると共に、音
声信号の包絡線成分を抽出し、これで副搬送波を変調
し、この変調波と分周波からなる合成波で更に搬送波を
周波数変調して外部に送出するといったものである。
To summarize the directions based on this document, after converting the voice signal to the SSB outside the voice band at the transmitting side to obtain the confidential signal, N
The frequency is divided and converted again to the sub-frequency within the voice band, the envelope component of the voice signal is extracted, the sub-carrier is modulated with this, and the carrier is further frequency-modulated by the composite wave consisting of this modulated wave and the sub-frequency. Then, it is sent to the outside.

(発明が解決しようとする問題点) しかしながらこの方法では、音声信号は一度音声帯域外
のSSBに変換するために、一般に音声のディジタル信号
処理で用いられるサンプリング周波数8kHzでは不足しよ
り高いサンプリング周波数が必要であるという欠点があ
り、また分周器および逓倍器等の周波数変換器の特性が
広帯域に保証されない、更に、副搬送波、搬送波に対す
る振幅、周波数変調では、受信側で復調する際に帯域制
限フィルタの特性に大きく左右され復調音声の明瞭度が
劣化するといった問題点があった。
(Problems to be solved by the invention) However, in this method, since the voice signal is once converted into the SSB outside the voice band, the sampling frequency of 8 kHz which is generally used in the digital signal processing of voice is insufficient and a higher sampling frequency is generated. There is a drawback that it is necessary, and the characteristics of frequency converters such as frequency dividers and multipliers are not guaranteed in a wide band.In addition, with subcarriers, amplitudes to carrier waves, and frequency modulation, band limitation when demodulating at the receiving side is required. There is a problem that the clarity of the demodulated voice is greatly affected by the characteristics of the filter.

この発明は、以上述べたサンプリング周波数の高速化、
周波数変換器の特性不良、変復調方式に伴う復調音声の
明瞭度の劣化といった問題点を除去し、狭帯域、全ディ
ジタル信号処理、良好な復調明瞭度等の特長を有する音
声秘話装置を提供することを目的とする。
The present invention is to speed up the sampling frequency described above,
To provide a voice confidential device having features such as narrow band, all digital signal processing, and good demodulation intelligibility by eliminating problems such as poor characteristics of a frequency converter and deterioration of intelligibility of demodulated voice due to a modulation / demodulation method. With the goal.

(問題点を解決するための手段) 本発明は、入力信号に基づいて、振幅が一定で互に直交
する同相成分xeと直交成分x0とを作成し、 暗号鍵に対応したランダムな位相値を取るランダム信号
に基づいて、振幅が一定で互いに直交する同相成分re
直交成分r0とを作成し、 前記入力信号の同相成分xe及び直交成分x0と前記ランダ
ム信号の同相成分re及び直交成分r0とを、同相成分同士
及び直交成分同士乗積して同相成分乗算値ueと直交成分
乗算値u0とを作成し、 当該同相成分乗積値ueと当該直交成分乗算値u0とを加算
し、 当該加算値と前記入力信号の振幅成分aとを乗積して秘
話信号を作成するようにしたものである。
(Means for Solving the Problems) The present invention creates an in-phase component x e and a quadrature component x 0 , which have constant amplitude and are orthogonal to each other, based on an input signal, and a random phase corresponding to an encryption key. Based on a random signal that takes a value, an in-phase component r e and a quadrature component r 0 having a constant amplitude and orthogonal to each other are created, and an in-phase component x e and a quadrature component x 0 of the input signal and an in-phase component of the random signal are created. a r e and a quadrature component r 0, to create the in-phase component multiplied value u e and quadrature component product values u 0 by each other multiplying in-phase component and between the quadrature component, the quadrature and the in-phase component multiplied value u e The secret multiplication signal is created by adding the component multiplication value u 0 and multiplying the added value by the amplitude component a of the input signal.

(作用) 時点nTsについて、θとを位相成分として、xe(nTs)
=cosθ(nTs)、x0(nTs)=sinθ(nTs),re(nTs)
=cos(nTs)、ro(nTs)=sin(nTs)で表わし、
振幅成分をa(nTs)とすると、秘話信号p(nTs)は、
a(nTs)cos(θ(nTs)−(nTs))となる。
(Action) For time point nTs, let x and θ be the phase components, and x e (nTs)
= Cos θ (nTs), x 0 (nTs) = sin θ (nTs), re (nTs)
= Cos (nTs), ro (nTs) = sin (nTs),
If the amplitude component is a (nTs), the confidential signal p (nTs) is
It becomes a (nTs) cos (θ (nTs) − (nTs)).

θ(nTs)−(nTs)はランダムな位相であり、高い秘
話強度を有する。
θ (nTs) − (nTs) is a random phase and has a high confidentiality intensity.

今、θ(nTs)=2πfvnTs、(nTs)=2πfrnTsとす
ると秘話信号p(nTs)は、p(nTs)=a(nTs)cos2
π(fv−fr)・nTs=a(nTs)cos2π(fr−fv)(nT
s)と表わすことができ、適当な狭帯域に制限できる。
例えば、入力音声信号をfBLからfBHまで帯域制限した場
合、ランダム信号の帯域を適当に設定することにより、
秘話信号p(nTs)もfBLからfBHまでの狭帯域信号とす
ることができる。
Now, assuming that θ (nTs) = 2πf v nTs and (nTs) = 2πf r nTs, the confidential signal p (nTs) is p (nTs) = a (nTs) cos2.
π (f v −f r ) nTs = a (nTs) cos2 π (f r −f v ) (nT
s) and can be limited to an appropriate narrow band.
For example, if the input voice signal is band limited from f BL to f BH , by setting the band of the random signal appropriately,
Confidential signal p (nTs) can also be a narrow-band signal from f BL to f BH.

(実施例) 第1図は、この発明の実施例を示すブロック図である。
第1図において1と18はアナログディジタル変換部、2
と16と19と33は音声帯域制限フィルタ部、3と20は送受
信器入力信号直交化フィルタ部、4と21は振幅成分抽出
部、5と6と22と23は同相、直交信号変換部、7と24は
同一の暗号鍵、8と25は同一の暗号データ発生部、9と
26は同一のランダム信号発生部、10と27はランダム信号
帯域制限フィルタ部、11と28は、ランダム信号直交化フ
ィルタ部、12と13と29と30は乗積変調部、14と31は加算
部、15と32は乗積部、17と34はディジタル・アナログ変
換部である。
(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, 1 and 18 are analog-digital conversion units and 2
, 16 and 19 and 33 are voice band limiting filter units, 3 and 20 are transmitter / receiver input signal orthogonalization filter units, 4 and 21 are amplitude component extraction units, 5 and 6, 22 and 23 are in-phase, quadrature signal conversion units, 7 and 24 are the same encryption key, 8 and 25 are the same encryption data generation unit, and 9
26 is the same random signal generation unit, 10 and 27 are random signal band limiting filter units, 11 and 28 are random signal orthogonalization filter units, 12 and 13 and 29 and 30 are product modulation units, and 14 and 31 are additions. , 15 and 32 are multiplication sections, and 17 and 34 are digital / analog conversion sections.

先ず、音声入力信号v(t)は、第1図のアナログ・デ
ィジタル(A/D)変換部1により、一定サンプリング周
波数s,サンプリング周期Tsでサンプリングされディジ
タル信号となり、帯域制限フィルタ(BPF1)2で、周波
数帯域がBLからBHまでの音声帯域信号x(nTs)と
なる。この音声帯域信号x(nTs)は、直交化フィルタ
部3により、直交信号(nTs)に変換される。ここ
で、直交化フィルタ部3はヒルベルト変換型トランスバ
ーサルフィルタアを用いており、x(nTs)を実部、
(nTs)を虚部とする信号X(nTs)は、X(nTs)=x
(nTs)+j(nTs)=a1(nTs)ejθ1(nTs)で表
わされ、その振幅成分 位相成分θ(nTs)=tan-1((nTs)/x(nTs))で
ある。従って、x(nTs)=a1(nTs)cosθ(nTs),
(nTs)=a1(nTs)sinθ(nTs)と表現でき、振幅
成分抽出部4でa1(nTs)を求め、同相信号変換部5と
直交信号変換部6で同相信号xe(nTs)=cosθ(nT
s)と直交信号x0(nTs)=sinθ(nTs)を算出する。
暗号鍵7と24は、1,0パターンが同一の64ビット長の暗
号鍵で暗号部8と25により、暗号鍵7と24を初期データ
とした64ビットごとのブロック暗号データとなる。この
64ビット暗号データの全部または一部を用いて作られる
整数値に各々異なる位相値(nTs)を割り当てること
によりランダム信号発生部9と26で送受同一のランダム
信号r(nTs)=b(nTs)cos(nTs)を発生する。こ
のランダム信号r(nTs)は、送受同一の周波数帯域
すなわちRL RHのランダム信号帯域制限フ
ィルタ部10と27を通過後、分岐され、一方は同相成分re
(nTs)=cos(nTs)また、他方は、ランダム信号直
交化部11と28によりr0(nTs)=sin(nTs)に変換さ
れる。乗積変調部12と13では、入力音声信号の同相成分
xe(nTs)とランダム信号の同相成分の積ue(nTs)=xe
(nTs)・re(nTs)及び入力音声信号の直交成分x0(nT
s)とランダム信号の直交成分の積u0(nTs)=x0(nT
s)r0(nTs)が算出され、加算部14において両乗積値の
和u(nTs)=ue(nTs)+u0(nTs)が算出される。更
に乗積部15において振幅成分抽出部4の出力a1(nTs)
と加算部14の出力u(nTs)の積p0(nTs)が算出され、
音声帯域制限フィルタ部16を通過してp1(nTs)とな
り、ディジタル・アナログ(D/A)変換部17によりアナ
ログの周波数がVLからVHに帯域制限された秘話信号
p(t)となる。
First, the voice input signal v (t) is sampled at a constant sampling frequency s and a sampling period T s by the analog / digital (A / D) conversion unit 1 in FIG. 1 to become a digital signal, and a band limiting filter (BPF 1 2), the frequency band becomes the voice band signal x (nTs) from BL to BH . The voice band signal x (nTs) is converted into an orthogonal signal (nTs) by the orthogonalization filter unit 3. Here, the orthogonalization filter unit 3 uses a Hilbert transform type transversal filter unit, and x (nTs) is a real part,
The signal X (nTs) whose imaginary part is (nTs) is X (nTs) = x
(NTs) + j (nTs) = a 1 (nTs) e jθ1 (nTs) and its amplitude component The phase component θ 1 (nTs) = tan −1 ((nTs) / x (nTs)). Therefore, x (nTs) = a 1 (nTs) cos θ 1 (nTs),
It can be expressed as (nTs) = a 1 (nTs) sin θ 1 (nTs), the amplitude component extraction unit 4 obtains a 1 (nTs), and the in-phase signal conversion unit 5 and the quadrature signal conversion unit 6 in-phase signal x e (NTs) = cos θ 1 (nT
s) and the orthogonal signal x 0 (nTs) = sin θ 1 (nTs).
The encryption keys 7 and 24 are 64-bit length encryption keys having the same 1,0 pattern, and are encrypted by the encryption units 8 and 25 as block encryption data for each 64-bit with the encryption keys 7 and 24 as initial data. this
Random signal generators 9 and 26 send and receive the same random signal r (nTs) = b (nTs) by assigning different phase values (nTs) to integer values created by using all or part of 64-bit encrypted data. Generate cos (nTs). This random signal r (nTs) is transmitted and received in the same frequency band.
After passing through the R ie RL R RH of the random signal band limiting filter unit 10 and 27, it is branched, one phase component r e
(NTs) = cos (nTs) Further, the other is converted into r 0 (nTs) = sin (nTs) by the random signal orthogonalization units 11 and 28. In the product modulators 12 and 13, the in-phase component of the input audio signal
The product of x e (nTs) and the in-phase component of the random signal u e (nTs) = x e
(NTs) · r e (nTs ) and quadrature component x 0 (nT input speech signal
s) and the orthogonal component of the random signal u 0 (nTs) = x 0 (nT
s) r 0 (nTs) is calculated, and the addition unit 14 calculates the sum of squared product values u (nTs) = u e (nTs) + u 0 (nTs). Further, in the multiplication unit 15, the output a 1 (nTs) of the amplitude component extraction unit 4
And a product p 0 (nTs) of the output u (nTs) of the adder 14 is calculated,
After passing through the voice band limiting filter unit 16, it becomes p 1 (nTs), and the digital-analog (D / A) conversion unit 17 band-passes the analog frequency from VL to VH to obtain a secret signal p (t).

秘話信号p(nTs)=a1(nTs)u(nTs)=a1(nTs)
(cosθ(nTs)cos(nTs)+sinθ(nTs)sin
(nTs))=a1(nTs)cos(θ(nTs)−(nTs))
であり、位相θ(nTs)−(nTs)は、ランダムな位
相であり秘話信号p(t)はランダム信号となり高い秘
話強度を有する。また、入力音声信号が有する周波数帯
域をVLからVHまでとすると、ランダム位相θ(nT
s)−(nTs)=2π()nTsとなりp(nT
s)=a1(nTs)cos2π()nTs=a1(nTs)co
s2π()nTsよりBL BH
なるように、ランダム信号制限フィルタ部10と27の帯域
特性RLRHと調整すれば帯域がBLからBHまでの
狭帯域な秘話信号が得られる。
Secret signal p (nTs) = a 1 (nTs) u (nTs) = a 1 (nTs)
(Cos θ 1 (nTs) cos (nTs) + sin θ 1 (nTs) sin
(NTs)) = a 1 ( nTs) cos (θ 1 (nTs) - (nTs))
The phase θ 1 (nTs) − (nTs) is a random phase, and the confidential signal p (t) is a random signal and has a high confidential strength. If the frequency band of the input audio signal is from VL to VH , the random phase θ 1 (nT
s) − (nTs) = 2π ( vr ) nTs and p (nT
s) = a 1 (nTs) cos 2π ( vr ) nTs = a 1 (nTs) co
By adjusting the band characteristics RL and RH of the random signal limiting filter units 10 and 27 so that BL rv BH can be obtained from s2π ( rv ) nTs, a secret signal with a narrow band from BL to BH can be obtained. To be

次に、受信側ではアナログ秘話信号p(nTs)は、A/D変
換部18でディジタル信号y0(nTs)となり、帯域制限フ
ィルタ部19で、送信側と同じくBLからBHまでの帯域
に制限された信号y1(nTs)となる。この信号y1(nTs)
は、送信側と同一の特性を有する直交化フィルタ部20に
より、(nTs)に変換され、y(nTs)=y1(nTs)を
実部、(nTs)を虚部とする信号Y(nTs)=y(nT
s)+j(nTs)=a2(nTs)ejθ2(nTs)の振幅成
分a2(nTs)が、振幅成分抽出部21により として算出される。また、位相成分θ(nTs)=tan-1
((nTs)/y(nTs))を用いてy(nTs)=a2(nTs)
cosθ(nTs),(nTs)=a2(nTs)sinθ(nTs)
と表現でき、同相信号変換部22でye(nTs)=cosθ
(nTs)、直交信号変換部23でy0(nTs)=sinθ(n
Ts)が得られる。
Next, on the receiving side, the analog confidential signal p (nTs) becomes a digital signal y 0 (nTs) at the A / D conversion section 18, and the band limiting filter section 19 limits it to the band from BL to BH as at the transmitting side. The resulting signal is y 1 (nTs). This signal y 1 (nTs)
Is converted into (nTs) by the orthogonalization filter unit 20 having the same characteristics as the transmitting side, and a signal Y (nTs) in which y (nTs) = y 1 (nTs) is a real part and (nTs) is an imaginary part is converted. ) = Y (nT
s) + j (nTs) = a 2 (nTs) e jθ2 (nTs) 's amplitude component a 2 (nTs) is detected by the amplitude component extraction unit 21. Is calculated as Also, the phase component θ 2 (nTs) = tan -1
Using ((nTs) / y (nTs)), y (nTs) = a 2 (nTs)
cosθ 2 (nTs), (nTs) = a 2 (nTs) sinθ 2 (nTs)
Can be expressed as y e (nTs) = cos θ in the in-phase signal conversion unit 22.
2 (nTs), y 0 (nTs) = sin θ 2 (n
Ts) is obtained.

この同相、直交成分ye(nTs)とy0(nTs)は、送信部で
既に述べたランダム信号の同相成分re(nTs)と直交成
分r0(nTs)とを用いて、乗積変調部29及び30により乗
積変調され、同相成分出力se(nTs)=ye(nTs)re(nT
s)、直交成分出力s0(nTs)=y0(nTs)・r0(nTs)を
得る。上記2成分出力se(nTs),s0(nTs)は、加算部3
1によりs(nTs)=se(nTs)+s0(nTs)となり、更に
乗積部32で上記振幅成分a2(nTs)とs(nTs)が乗積さ
れ、z0(nTs)=a2(nTs)s(nTs)となる。ここで秘
話信号p(nTs)=a1(nTs)cos(θ(nTs)−(nT
s))に対して、a2(nTs)=a1(nTs),se(nTs)=ye
(nTs)re(nTs)=cos(θ(nTs)−(nTs))・c
os(nTs),s0(nTs)=y0(nTs)r0(nTs)=sin(θ
(nTs)−(nTs))sin(nTs)より、z0(nTs)
=a1(nTs)(cos(θ(nTs)−(nTs))cos(n
Ts)+sin(θ(nTs)−(nTs)・sin(nTs))
=a1(nTs)cosθ(nTs)となり、z0(nTs)は、帯域
制限フィルタ部33を通過後z1(nTs)となり、D/A変換部
34によりアナログの復調音声信号z(t)が得られる。
帯域制限フィルタ部33の劣化がなければz1(nTs)=z0
(nTs)=x(nTs)=a1(nTs)cosθ(nTs)となり完
全に入力音声信号が復調可能である。
The in-phase and quadrature components y e (nTs) and y 0 (nTs) are product-modulated by using the in-phase component r e (nTs) and the quadrature component r 0 (nTs) of the random signal already described in the transmission section. In-phase component output s e (nTs) = y e (nTs) r e (nT
s), the quadrature component output s 0 (nTs) = y 0 (nTs) · r 0 (nTs) is obtained. The two-component output s e (nTs), s 0 (nTs) is added by the adder 3
1 yields s (nTs) = s e (nTs) + s 0 (nTs), and the product 32 further multiplies the amplitude components a 2 (nTs) and s (nTs) by z 0 (nTs) = a 2 (nTs) s (nTs). Here, the secret signal p (nTs) = a 1 (nTs) cos (θ 1 (nTs) − (nT
relative s)), a 2 (nTs ) = a 1 (nTs), s e (nTs) = y e
(NTs) r e (nTs) = cos (θ 1 (nTs) - (nTs)) · c
os (nTs), s 0 (nTs) = y 0 (nTs) r 0 (nTs) = sin (θ
From 1 (nTs)-(nTs)) sin (nTs), z 0 (nTs)
= A 1 (nTs) (cos (θ 1 (nTs)-(nTs)) cos (n
Ts) + sin (θ 1 (nTs)-(nTs) ・ sin (nTs))
= A 1 (nTs) cos θ 1 (nTs), z 0 (nTs) becomes z 1 (nTs) after passing through the band limiting filter unit 33, and the D / A conversion unit
An analog demodulated voice signal z (t) is obtained by 34.
If there is no deterioration of the band limiting filter unit 33, z 1 (nTs) = z 0
Since (nTs) = x (nTs) = a 1 (nTs) cos θ (nTs), the input voice signal can be completely demodulated.

第2図はこの実施例での動作の説明図であり、サンプリ
ング周波数=8kHz、入力音声信号として周波数
=800Hzの一定のトーン信号を用いた。音声帯域はBL
=300Hz,BH=3000Hz,ランダム信号帯域はRL=2800H
z,RH=3200Hzである。第2図a)は、入力信号のパワ
ースペクトル、第2図b)は秘話信号のパワースペクト
ル、第2図c)は復調信号のパワースペクトルで、高い
秘話性と良好な復調明瞭度が得られている。
FIG. 2 is an explanatory diagram of the operation in this embodiment, in which the sampling frequency s = 8 kHz and the frequency v as the input audio signal.
= 800 Hz constant tone signal was used. The voice band is BL
= 300Hz, BH = 3000Hz, random signal band is RL = 2800H
z, RH = 3200Hz. 2a) is the power spectrum of the input signal, FIG. 2b) is the power spectrum of the confidential signal, and FIG. 2c) is the power spectrum of the demodulated signal. High confidentiality and good demodulation clarity are obtained. ing.

なお、本発明におけるランダム信号は、暗号鍵を初期値
としてブロック暗号データを発生するアルゴリズムによ
ることの外、暗号鍵を初期値として一度は暗号データを
発生するが、次からは、初めの暗号データを種として構
成の簡単な一様乱数発生器により、乱数を発生させて、
それを暗号データとして使う方法、或いはブロック暗号
データの下位少数ビートのみ採用して新らたなるブロッ
クデータを発生させる方法などを採用して、作成するこ
ともできる。
The random signal in the present invention generates the encrypted data once with the encryption key as the initial value, in addition to the algorithm that generates the block encrypted data with the encryption key as the initial value. Generate a random number using a uniform random number generator with a simple seed
It can also be created using a method of using it as encrypted data, or a method of generating new block data by adopting only the lower few beats of block encrypted data.

また、第1図の同相直交変換部5,6は、図示の除去回路
の外、振幅可変手段によることもできる。
Further, the in-phase / quadrature conversion units 5 and 6 in FIG. 1 can be constituted by amplitude varying means in addition to the removing circuit shown.

(発明の効果) 以上、詳細に説明したように、秘話通信方法において、 (1) 送信側の暗号鍵と受信側の暗号鍵を同一のもの
としたので、暗号鍵の共有者以外には秘話出力の解読盗
聴が困難であるといった効果が期待できる。
(Effects of the Invention) As described above in detail, in the confidential communication method, (1) Since the encryption key on the transmitting side and the encryption key on the receiving side are the same, it is confidential to anyone other than the owner of the encryption key. The effect that it is difficult to decipher and eavesdrop the output can be expected.

(2) 秘話出力信号は、音声入力信号を非周期性のラ
ンダム位相値で周波数(位相)変調したものであり、高
い秘話程度が保証される。
(2) The confidential output signal is a signal obtained by frequency-modulating a voice input signal with a non-periodic random phase value, and a high confidential level is guaranteed.

(3) サンプリング周波数=8kHz、直交化部をデ
ィジタルフィルタとしたので全ディジタル信号処理が可
能で小型化が可能である。
(3) Since the sampling frequency s = 8 kHz and the orthogonalization unit is a digital filter, all digital signal processing is possible and miniaturization is possible.

(4) 伝送帯域内音声スクランブルとしたので狭帯域
音声秘話装置が実現可能である。
(4) Since the voice is scrambled within the transmission band, a narrowband voice confidential device can be realized.

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

第1図は本発明の一実施例を示すブロック図、第2図は
第1図にした秘話通信装置の動作を示す説明図である。 1,18……アナログディジタル変換部、2,16,19,33……音
声帯域制限フィルタ部、3,20……送受信器入力信号直交
化フィルタ部、4,21……振幅成分抽出部、5,6,22,23…
…同相直交信号変換部、7,24……同一の暗号鍵、8,25…
…暗号データ発生部、10,27……ランダム信号帯域制限
フィルタ部、11,28……ランダム信号直交化フィルタ
部、12,13,29,30……乗積変調部、14,31……加算部、1
5,32……乗積部、17,34……ディジタルアナログ変換
部。
FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the operation of the confidential communication apparatus shown in FIG. 1,18 …… Analog to digital converter, 2,16,19,33 …… Voice band limiting filter, 3,20 …… Transceiver input signal orthogonalization filter, 4,21 …… Amplitude component extractor, 5 , 6,22,23 ...
… In-phase and quadrature signal converter, 7,24 …… Same encryption key, 8,25…
… Cryptographic data generator, 10,27 …… Random signal band limiting filter, 11,28 …… Random signal orthogonalization filter, 12,13,29,30 …… Multiplying modulator, 14,31 …… Addition Part, 1
5,32 …… Multiplying section, 17,34 …… Digital-analog conversion section.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】a) 入力信号に基づいて、振幅が一定で
互に直交する同相成分xeと直交成分x0とを作成し、 b) 暗号鍵を元にしたランダムな位相値を取るランダ
ム信号に基づいて、振幅が一定で互いに直交する同相成
分reと直交成分r0とを作成し、 c) 前記入力信号の同相成分xe及び直交成分x0と前記
ランダム信号の同相成分re及び直交成分r0とを、同相成
分同士及び直交成分同士乗積して同相成分乗積値ueと直
交成分乗積値u0とを作成し、 d) 当該同相成分乗積値ueと当該直交成分乗積値u0
を加算し、 e) 当該加算値と前記入力信号の振幅成分aとを乗積
して秘話信号を作成する、 ことを特徴とした狭帯域秘話通信方法。
1. An a) in-phase component x e and a quadrature component x 0 having a constant amplitude and orthogonal to each other are created based on an input signal, and b) a random phase value based on an encryption key. An in-phase component r e and a quadrature component r 0 having a constant amplitude and orthogonal to each other are created based on the signal, and c) the in-phase component x e and the quadrature component x 0 of the input signal and the in-phase component r e of the random signal. And the quadrature component r 0 are multiplied by the in-phase components and the quadrature components to create the in-phase component product value u e and the quadrature component product value u 0, and d) the in-phase component product value u e A narrowband confidential communication method characterized by adding the orthogonal component product value u 0, and e) multiplying the added value and the amplitude component a of the input signal to create a confidential signal.
JP62112620A 1987-05-11 1987-05-11 Narrowband confidential communication method Expired - Lifetime JPH0754926B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62112620A JPH0754926B2 (en) 1987-05-11 1987-05-11 Narrowband confidential communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62112620A JPH0754926B2 (en) 1987-05-11 1987-05-11 Narrowband confidential communication method

Publications (2)

Publication Number Publication Date
JPS63279630A JPS63279630A (en) 1988-11-16
JPH0754926B2 true JPH0754926B2 (en) 1995-06-07

Family

ID=14591290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62112620A Expired - Lifetime JPH0754926B2 (en) 1987-05-11 1987-05-11 Narrowband confidential communication method

Country Status (1)

Country Link
JP (1) JPH0754926B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339464C2 (en) * 1993-11-19 1995-11-16 Litef Gmbh Method for disguising and unveiling speech during voice transmission and device for carrying out the method
US7693284B2 (en) * 2004-09-23 2010-04-06 Motorola, Inc. Method and apparatus for encryption of over-the-air communications in a wireless communication system
US7804912B2 (en) * 2004-09-23 2010-09-28 Motorola, Inc. Method and apparatus for encryption of over-the-air communications in a wireless communication system

Also Published As

Publication number Publication date
JPS63279630A (en) 1988-11-16

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