CN204795013U

CN204795013U - Mixed intercom of ECHAT public network and private network

Info

Publication number: CN204795013U
Application number: CN201520313858.3U
Authority: CN
Inventors: 尹力学
Original assignee: LISHENG (FUJIAN) COMMUNICATION CO Ltd
Current assignee: LISHENG (FUJIAN) COMMUNICATION CO Ltd
Priority date: 2015-05-15
Filing date: 2015-05-15
Publication date: 2015-11-18
Anticipated expiration: 2025-05-15

Abstract

The utility model discloses a mixed intercom of ECHAT public network and private network, including antenna I, public network integrated circuit, MCU, PLL, enlarge, promotion, power amplification pipe, antenna II, crystal oscillator, demodulation circuit, mixing, receipt height discharge way, C5000, audio power amplifier, loudspeaker, microphone and cell -phone card, this mixed intercom of ECHAT public network and private network has contained public network mode, figure pattern and simulation model, can send away the signal of the private network received through the public network module.

Description

ECHAT public network and private network mixing intercom

Technical field

The utility model relates to wireless communication technique field, especially public network and private network is mixed use, contains ECHAT public network and the private network mixing intercom of public network mode, figure pattern and simulation model 3 kinds of patterns.

Background technology

Existing intercom only support number word pattern communicates with simulation model, but, no matter be figure pattern intercom, or simulation model intercom, its communication range is all by distance limit, and cannot grow arbitrarily the call of distance, result of use is had a greatly reduced quality.

Summary of the invention

The purpose of this utility model is to provide ECHAT public network and private network mixing intercom, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme: ECHAT public network and private network mixing intercom, it is characterized in that: comprise antenna I, public network integrated circuit, MCU, PLL, amplifying device, thrust unit, power amplifier tube, antenna II, crystal oscillator, demodulator circuit, mixing, receive High Amplifier Circuit, C5000, audio frequency amplifies, loudspeaker, microphone and Mobile phone card, described antenna I, public network integrated circuit, PLL, amplifying device, thrust unit, power amplifier tube, antenna II connects successively, described MCU respectively with public network integrated circuit, PLL is connected with demodulator circuit, described PLL and crystal oscillator, demodulator circuit, C5000 connects successively, described demodulator circuit, mixing, receive High Amplifier Circuit, antenna II connects successively, described C5000, audio frequency amplifies, loudspeaker connect successively, described microphone is connected with C5000, described public network integrated circuit amplifies with audio frequency and is connected, described PLL is connected with mixing, described Mobile phone card is connected with public network integrated circuit.

Further, described Mobile phone card is UIM.

Compared with prior art, the beneficial effects of the utility model are: public network and private network are mixed use by this intercom, contain public network mode, figure pattern and simulation model 3 kinds of patterns, can arrange simultaneously and the signal of the private network received is sent by public network module, also can be used as relaying to use this ECHAT public network and private network mixing intercom.

Accompanying drawing explanation

Fig. 1 is the utility model principle schematic;

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, the utility model provides a kind of technical scheme: ECHAT public network and private network mixing intercom.

Specific works principle:

One, module introduction

1, public network integrated circuit is CDMA20001X, makes user wirelessly directly enter the Internet, the place having mobile network CDMA2000 and cover, can connecting Internet whenever and wherever possible, also has the functions such as transmitting-receiving short message (SMS), voice call.

2, C5000 chip is a conjunction ETSITS102361(DMR) digital intercom standard, support simulation intercommunication application simultaneously, be applicable to digital intercom terminal, special colony terminal and low speed data, Tone Via terminal applies, support the terminal applies under relaying and non-stop layer mode.The high performance 4FSK modulator-demodulator of integrated chip, channel coding/decoding and standard agreement processor, adopt physical layer, data link layer and call control layer three layers of open design, user utilizes chip to realize the digital terminal exploitation of standard DMR, without the need to grasp standard details; User also utilized chip two-layer protocol interface carries out the exploitation of PDT agreement or custom protocol, meets high-end applications demand.Chip supports multiple radio frequency interface, compatible original analog-interphone radio-frequency channel.

3, PLL: be phase-locked loop or phase-locked loop, phase-locked loop is a kind of feedback control circuit, is called for short phase-locked loop.The feature of phase-locked loop is: the frequency and the phase place that utilize the reference signal control loop internal oscillation signal of outside input.Because of phase-locked loop can realize output signal frequency to frequency input signal from motion tracking, so phase-locked loop is generally used for Closed loop track circuit.Phase-locked loop is in the process of work, and when the frequency outputed signal is equal with the frequency of input signal, output voltage and input voltage keep fixing phase difference value, and namely the phase place of output voltage and input voltage is lockable, the origin of phase-locked loop title that Here it is.Phase-locked loop is made up of phase discriminator, loop filter and voltage controlled oscillator (VCO) three part usually.

Two, be implemented as follows:

1, public network signal receives:

(1), signal will be delivered to inside public network integrated circuit when our antenna I being connected to public network integrated circuit receives signal time, be undertaken demodulating voice signal by the circuit of inside, and give MCU mono-high level signal received simultaneously.And voice signal is delivered to inside PLL modulate.

(2), PLL by the signal after modulation by amplifying, promoting, power amplifier tube, then it is aerial to be radiated sky by antenna II.Also in the machine, audio signal is exported by audio amplifier circuit simultaneously.

2, numeral, simulation private network receive signal:

(1), faint when conventional private network receives signal time signal is amplified signal by the high road of putting back to of low noise, the first mixed frequency signal is gone out in the VCO local oscillation signal mixing brought with PLL, the signal that mixing goes out, delivering to special digital demodulating circuit NJM2591 process, is finally delivered to C5000 and is carried out demodulation.

(2) signal can be delivered in public network integrated circuit after C5000 demodulates voice signal, modulate, finally the signal modulated by CMDA aerial radiation in the air.Also in the machine, audio signal is exported by audio amplifier circuit simultaneously.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

Claims

1.ECHAT public network and private network mixing intercom, it is characterized in that: comprise antenna I (1), public network integrated circuit, MCU, PLL, amplifying device, thrust unit, power amplifier tube, antenna II (2), crystal oscillator, demodulator circuit, mixing, receive High Amplifier Circuit, C5000, audio frequency amplifies, loudspeaker, microphone and Mobile phone card, described antenna I (1), public network integrated circuit, PLL, amplifying device, thrust unit, power amplifier tube, antenna II (2) connects successively, described MCU respectively with public network integrated circuit, PLL is connected with demodulator circuit, described PLL and crystal oscillator, demodulator circuit, C5000 connects successively, described demodulator circuit, mixing, receive High Amplifier Circuit, antenna II (2) connects successively, described C5000, audio frequency amplifies, loudspeaker connect successively, described microphone is connected with C5000, described public network integrated circuit amplifies with audio frequency and is connected, described PLL is connected with mixing, described Mobile phone card is connected with public network integrated circuit.

2. ECHAT public network as claimed in claim 1 and private network mixing intercom, it is characterized in that, described Mobile phone card is UIM.