CN2138862Y

CN2138862Y - Enciphered telephone

Info

Publication number: CN2138862Y
Application number: CN 92238604
Authority: CN
Inventors: 李伟; 郭军生; 安文河
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-29
Filing date: 1992-10-29
Publication date: 1993-07-21
Anticipated expiration: 2002-10-29

Abstract

The utility model discloses an enciphered telephone which is provided with two functions of common talking and cryptographic talking. The enciphered telephone comprises a telephone main body and a telephone handle. The main body is provided with a keyboard, an enciphered / non-enciphered converting switch and a cipher key converting switch; the main body is connected with a modem circuit besides the talking circuit of common telephone; the modem circuit is composed of a low pass filtering circuit, a modem circuit and a frequency dividing circuit; the common voice signals are modulated, enciphered and sent out by the circuits, and the enciphered voice signals are demodulated, deciphered and received by the circuits; the talking circuit is connected with the modem circuit, when the converting switch is on the enciphered position; the talking circuit is disconnected with the modem circuit, when the converting switch is on the deciphered position; the frequency dividing circuit is provided with a frequency change-over switch in order to form different enciphered methods; the circuit element adopts an integrated circuit.

Description

Enciphered telephone

The utility model belongs to telephone communication device.

The application of the various phones of China at present is very general, has been penetrated in all trades and professions and the personal lifestyle, and Content of Communication relates to military affairs, national defence, public security, economy, science and technology and family's various aspects.But because China's telecommunications industry is started late, communication equipment is comparatively backward, often cause the various phenomenons of giving away secrets, as situations such as the automatic magnetic field exposure of phone, line cord cross-talk, the inner wrong number cross-talk of portion's machine, exchange monitorings.Current, though the existing secret phone equipment of China, its complex structure, volume be big, involve great expense, and can not satisfy the needs of social all trades and professions and personal lifestyle.

The utility model applicant is 92234580.5 at application number, name is called in the patent of " acoustical coupling has, radio telephone encryption equipment ", proposed a kind of simple in structure, easy to use, be beneficial to universal telephone encryption device, this device is the portable phone encryption device that a kind of on-fixed is installed, and for many organs and private home, often wish to install fixed type telephone again with encryption function, for this reason, the utility model has proposed a kind of scrambler phone machine on the basis of aforementioned patent.The purpose of this utility model is to add the encryption and decryption device to form a kind of scrambler phone machine in the ordinary telephone set structure.

Another purpose of the present utility model provides the scrambler phone machine of the alternative cipher key switch of a kind of 8-16 of having kind, to improve the communication security degree.

Another purpose of the present utility model provides a kind of scrambler phone machine with integrated circuit component, to reduce volume, saves energy, enhancing reliability.

The basic structure and the ordinary telephone set of the utility model scrambler phone machine are close, also partly form by phone body and telephone handle two, in the phone body, except that the circuit of common phone, also be provided with the encrypting and decrypting circuit, and corresponding encryption change over switch is housed on phone.

The schematic block circuit diagram of the utility model scrambler phone machine as shown in Figure 1, square frame A is a ringing circuit, the 25Hz ringing signal that switch is sent here becomes direct current, produces the moving loud speakers of the different alternating signal bodies of two kinds of frequencies then and sounds; Square frame B is a polar protective circuit, is used for the uncertain voltage of polarity on a/b, the b/a line is become the fixing voltage of polarity, to guarantee the desired electric power polarity of dial-up circuit, speaking circuit, modulation circuit subsequently; Square frame C is a dial-up circuit, can Enter Number keyboard and change corresponding pulse into or double-audio signal is delivered on the circuit, send " Ka Ka " sound that in receiver, produces when purified signal is eliminated dialing simultaneously, square frame D is a speaking circuit, and it mainly plays the two wires--four line conversions, anti-sidetone, amplification receive and send signal; Square frame E is a modulation-demodulation circuit, is used for the voice encryption that will send and calling is deciphered; Square frame F is the transmitter and the receiver of drawing, and is used for sound/electricity, the conversion of electricity/sound; K switch among the figure ₁, phone is switched between normal talking and two kinds of operating states of speech scrambling.A in the above-mentioned block diagram, B, C, D circuit and F give/receiver is all identical with ordinary telephone set, feature of the present utility model be the modulation-demodulation circuit E that added and with send/connected mode of receiver F and change over switch K.

Shown in Fig. 2,3, have encryption/non-encrypted change over switch 4 and key change over switch 5 on the scrambler phone machine body 1; Output and the input of speaking circuit D in the phone body 1 are connected to encryption/non-encrypted change over switch 4 respectively, this switch 4 has A, B and two switching positions of A ', B ', when A ', B ' position, speaking circuit D directly communicates respectively with receiver 7 and transmitter 6; When switch 4 placed A, B position, speaking circuit D communicated respectively with receiver 7 and transmitter 6 through modulation-demodulation circuit E;

Described modulation-demodulation circuit E comprise two amplification filtering circuit 8 and 8 ', a modulator-demodulator 9, one crystal oscillators 10 and frequency divider 11; When switch placed A, B position, the output of speaking circuit D was through K switch ₁A and described amplification filtering circuit 8 ' link to each other, the voice signal of encrypting is delivered to the input of modulator-demodulator 9 from circuit 8 ' output through amplification filtering, through demodulation go close output send back to more above-mentioned amplification filtering circuit 8 ' another input, again through filtering and power amplification and from its another output output, this output links to each other with receiver 7; To decipher voice signal sends;

Transmitter 4 links to each other with the input of amplification filtering circuit 8, the mandarin tone signal of being imported is exported another input of delivering to modulator-demodulator 9 after amplification filtering, encrypt and export through modulation from its another output, and send another input of amplification filtering circuit 8 back to, through filtering and power amplification and from its another output output, the coded signal of being exported is through K switch ₁B delivers to described circuit D;

One output of described frequency divider 11 and amplification filtering circuit 8 and 8 ' link to each other, so that the gating frequency signal to be provided, another output links to each other with modulation-demodulation circuit 9, so that the modulation frequency signal to be provided.

The utility model scrambler phone machine is elaborated with reference to the accompanying drawings, by embodiment.

Fig. 1 is the utility model scrambler phone machine circuit block diagram.

Fig. 2 is the utility model scrambler phone machine circuit schematic diagram.

Fig. 3 is the utility model scrambler phone outline drawing.

The external structure of the utility model scrambler phone machine comprises phone body 1, telephone handle 2, is loaded on keyboard 3, encryption/non-encrypted change over switch 4 and key change over switch 5 on the phone body 1 as shown in Figure 3.

The circuit of being installed in the phone body 1; as shown in Figure 1, 2; have the ringing circuit A that successively be connected, polar protective circuit B, dial-up circuit C and the speaking circuit D identical with ordinary telephone set, improvements of the present utility model are: increased modulation-demodulation circuit E, and utilized change over switch K ₁(4), make transmitter and receiver directly be communicated with speaking circuit D and to switch again with in the two states that speaking circuit D communicates through modulation.

Described modulation-demodulation circuit E's is composed as follows: transmitter 6 links to each other with the input of two adjustable lowpass sampled data filter 8-integrated circuit MC145414, voice signal is amplified and filtering, and the output signal of this integrated circuit is delivered to three groups of two-way analog switching ics of modulator-demodulator 9-CD4053 again and is modulated encryption; The coded signal of its output is delivered to another input of integrated circuit 8 again, carries out low-pass filtering and power amplification, and from its another output output, this output is through K switch then ₁B links to each other with the input of speaking circuit D, and the encrypted voice signal is delivered to speaking circuit D, and identical with plain old telephone then transmission means sends.After the encrypted voice signal that telephone set received arrives speaking circuit D, from its output output, again through K switch ₁A deliver to another pair adjustable lowpass sampling filter 8 '-integrated circuit MC145414, carrying out signal amplifies and low-pass filtering, three groups of two-way analog switching ic-CD4053 of modulator-demodulator 9-are delivered in its output, go close through demodulation, the restituted signal of its output deliver to said integrated circuit 8 ' another input, through low-pass filtering and amplification and export and deliver to receiver 7, be reduced to the normal voice signal again.

In above-mentioned modulation-demodulation circuit E, also have by crystal oscillating circuit 10 and frequency dividing circuit that frequency divider 11-ten tetrads serial counter/frequency divider integrated circuit CD4060 forms, its output and two integrated circuits 8 and 8 ' link to each other, so that the gating frequency to be provided to them, another output links to each other with modulator-demodulator 9, so that the modulation frequency to be provided; Frequency divider 11 also is connected with key change over switch K ₂(5), utilize this switch can change the output frequency of frequency divider 11, thereby can carry out modulation and demodulation, obtain the close mode of system of close frequency of different systems and various frequency change with various different frequencies (8-16 kind).

The using method of the utility model scrambler phone machine is very easy, is K switch with the encryption on the phone/non-encrypted change over switch 4( ₁) place encrypted location (K switch ₁Place A, B position), and select key change over switch S(K by the mode of both call sides agreement ₂) the position, can carry out secret telephony; When not needing to conversing when secret, as long as change over switch 4(K ₁) being transformed into A ' B ' position, transmitter 6 promptly directly links to each other with speaking circuit D with receiver 7, and at this moment, whole modulation-demodulation circuit E and telephone transmission system break away from, and do not play the close effect of system, thereby can carry out normal talking.

The utility model scrambler phone facility have following distinct advantages:

1. both had the function of common conversation, had the function of speech scrambling again, and only needed diverter switch to get final product during use.

2. circuit adopts integrated circuit component, and the microphone volume is little, and is close with ordinary telephone set.

3. simple in structure, cost is low, can be widely used in all trades and professions and the personal lifestyle.

Claims

1, a kind of scrambler phone machine, comprise phone body 1 and telephone handle 2, the ringing circuit A that connects successively is housed in the phone body 1, and polar protective circuit B, dial-up circuit C and speaking circuit D is characterized in that: have encryption/non-encrypted change over switch 4 and key change over switch 5 on the phone body 1; Output and the input of speaking circuit D in the phone body 1 are connected to encryption/non-encrypted change over switch 4 respectively, and this switch 4 has A, B and two switching positions of A ', B ', and when A ', B ' position, speaking circuit D directly communicates respectively with receiver 7 and transmitter 6; When switch 4 placed A, B position, speaking circuit D communicated respectively with receiver 7 and transmitter 6 through modulation-demodulation circuit E;

2, scrambler phone machine as claimed in claim 1 is characterized in that: described amplification filtering circuit 8 and 8 ' be two adjustable lowpass sampling filter--MC145414, and modulator-demodulator 9 is integrated circuit CD4053, frequency divider 11 is integrated circuit CD4060.

3, as claim 1,2 described scrambler phone machines, it is characterized in that: be connected to cipher key switch 5 on the described frequency divider 11, in order to change the modulation frequency that frequency divider 11 is exported.