WO2008014687A1

WO2008014687A1 - A digital broadcasting system and method for public emergency management service being taken precedence

Info

Publication number: WO2008014687A1
Application number: PCT/CN2007/002252
Authority: WO
Inventors: Yibing Wang; Xiaohang Wang
Original assignee: Yibing Wang; Xiaohang Wang
Priority date: 2006-07-26
Filing date: 2007-07-24
Publication date: 2008-02-07
Also published as: CN1913405A

Abstract

A digital broadcasting system and method for public emergency management service that is taken precedence. The digital broadcasting system includes a transmitting apparatus for receiving headers and tails of the digital information with DTMF code, and a receiving apparatus. The transmitting apparatus has a DTMF code trigger control circuit (D1) and a digital high-frequency modulator (T2). When the DTMF code trigger control circuit (D1) has received the header of the broadcasting station signal, it generates a control current to switch off normal broadcasting signals and switch on the public emergency signal, and when the DTMF code trigger control circuit (D1) has received the tails indicating the end of the public emergency signal, it switches on the normal broadcasting signals automatically. The receiving apparatus has a digital high-frequency signal demodulator circuit (Ts), which receives the digital high-frequency composite signal from the transmitting apparatus, and demodulates the digital high-frequency composite signal received to generate the digital base-band signal that receives the public emergency signal automatically in the state of shutting down.

Description

Digital broadcasting system for public emergency management service priority and method thereof

The present invention relates to a digital broadcast system for public emergency management service prioritization and a method thereof. More specifically, it relates to a digital broadcasting system and method for integrating public emergency management services by utilizing a common emergency and a header and a trailer of respective station signals. Background technique

The rapid development of digital information technology has made the public broadcasting industry need to transform into a comprehensive digital, multifunctional and intelligent. However, due to the influence of the application mode of the traditional analog era, the digital public broadcasting industry is at a high cost, with few functions, and intelligent applications cannot support the development of more social public utilities. The public emergency management service system, which is also implemented by audio broadcasting, is difficult to maintain due to factors such as traditional independent network construction and manual operation, and is in a state of large investment, low intelligence, poor reliability, and difficulty in maintenance and management. Widely realized, and can not be widely networked, there is an urgent need for a new type of digital broadcasting system to achieve integrated and integrated implementation. Summary of the invention

The object of the present invention is to provide a multifunctional, intelligent digital broadcasting system (wired and wireless dual-purpose) provided by the above existing digital broadcasting system and the public emergency management service system, and a combination thereof to realize a public emergency The technical structure of the management service. The header in the information of the time period (slice) of a data stream of the data information of the transmitting side is added with a double audio (DTMF) channel address encoding. The channel address encoding may encode different dual audio address encodings according to different multiple channels. A unified two-tone control code is added to the end of the stream in the time period (slice) of the data stream. A dual audio trigger control circuit is provided; the dual audio control circuit is provided with two circuits in a general-purpose radio, one of which is used for normal broadcast. When the data of the digital dual audio header with the station's channel address arrives, it is divided into two pieces of data. When one of the ways reaches the dual audio trigger circuit, a control current is generated to be supplied to the lower stage circuit under the trigger of the dual audio address encoding header of the station. At the end of the data information transmission of the time period (slice), the control circuit is turned off by the next stage circuit under the trigger of the double audio end, waiting for the next time period (chip) signal to arrive. The other circuit is dedicated to the management of public emergencies. When dedicated When the dual audio channel address coding header in the time period (slice) of the data stream of the public emergency arrives, the normal broadcast signal can be cut off, the common emergency event signal is turned on, and the control current is supplied to the next stage circuit. . Setting up a dedicated channel dedicated to the common emergency management service in multiple radio channels, working only when there is a public emergency task, so as to be able to receive public emergency when the receiver is in standby (manual shutdown) Management services. A digital high frequency modulation circuit device is provided on a plurality of radio channels (including alarms only). The device only operates when the pre-stage trigger control circuit gives the power supply current during the time period (chip) of the arrival of the signal, and modulates the digital baseband signal (including the dual audio signal and the signal tail) into a digital high-frequency composite signal. The digital high-frequency composite signal of the multi-channel channel is synthesized by the high-frequency synthesizer into a digital high-frequency broadband composite signal and sent to the broadcasting frequency band of the cable television system to form a regional cable broadcasting system. In small areas, high-frequency coaxial cable can also be used to form a local cable broadcasting system. The high frequency digital bandwidth composite signal can also be transmitted via digital broadband high frequency (such as a digital television transmitting device, up to 56 Mb/s) to form a digital wireless broadcasting system.

The above constitutes a computer, which serves the broadcast management system of multiple radio channels; at the same time, it supports the management service function of public emergencies according to the preferential application method. The high-speed logic operation function of the computer is fully utilized, providing a low-cost, intelligent, and multi-functional broadcast method for digital broadcasting. The manager of the public emergency can access each station channel via remote communication.

The present invention incorporates some of the techniques of the applicant's inventions numbered 200510105790.0 and 200510105789.8.

The high-frequency broadband digital composite signal of the digital broadcast is received by the high-frequency broadband (wired to the CATV system user port, and the wireless high-frequency broadband antenna is used for receiving). The high-frequency broadband composite signal is divided into two sets of high-frequency broadband digital composite signals by a high-frequency distributor, one of which is used for receiving a normal radio broadcast, and the high-frequency switch of the Hanlian combination power switch is connected when the user turns on the power The normal radio broadcast signal described therein is automatically turned on while the power source is turned on, and a digital high frequency composite signal of one of the radio channel is selected by the tuner (not shown) to enter the input end of the digital high frequency demodulator. The high frequency digital demodulator demodulates the digital baseband signal and sends it to a digital decoding and amplifying circuit (not shown) to complete the digital broadcast receiving task. The digital decoding and amplifying circuit can be a mobile phone, a notebook computer, an MP3, an MP4, a car stereo, a digital microcomputer sound, a digital radio, and the like. If the normally received station has a management service for a public emergency, the service can be received in real time. When the user turns off the power of the digital decoding amplifier circuit, the dual-connect switch automatically switches to the secondary of the other high-frequency distribution, and the secondary is connected with the high-frequency band pass filter, which can only receive the public emergency service. The frequency signal of the dedicated station. At the same time of shutdown, its high-frequency digital decoder automatically enters the sleep low-power state due to no signal input. When launching When the dedicated radio station of the public emergency is working, the high-frequency digital demodulator receives the signal through the high-frequency receiving end, automatically releases the sleep into the working state, and demodulates the digital high-frequency composite signal of the public emergency management service. For the digital baseband signal, the dual audio address coding of the baseband signal triggers the control circuit to operate, and the output control power source enables the lower digital decoding and amplifying circuit to automatically work, and completes the management service for the user to automatically receive the public emergency. At the end of the service, under the trigger control of the dual audio signal tail, the power supply of the digital decoding amplifying circuit is automatically turned off, and the receiver is restored to the shutdown state. The public emergency management service special system can be applied to a fire alarm and escape command and dispatch LAN system in fire protection.

In order to achieve the object of the present invention, a digital broadcasting system for public emergency management service priority is provided, comprising: a transmitting device that receives each station information from a computer that is divided into time segments (slices) on time. a header and a tail, the header is provided with a respective dual audio identification code, and the source tail is provided with a unified dual audio control code, and the transmitting device has: a dual audio code trigger control circuit of multiple stations, the public emergency priority Dual audio coding trigger control circuit. When there is a double audio address code of the station in the header of the time period (chip) information coming from the computer, the control current is output, and the output control current is stopped under the action of the signal tail. When receiving the header of the common emergency signal, generating a control current according to the header, cutting off the normal broadcast signal and turning on the common emergency event signal, and stopping receiving when receiving the tail of the common emergency signal Controlling the current and automatically turning on the normal broadcast signal; and the digital high frequency modulator, modulating the common burst signal into a digital high frequency composite signal under the control current from the dual audio code trigger control circuit; and receiving The device has: a digital high frequency signal demodulation circuit that receives a digital high frequency composite signal from a transmitting device, demodulates the received digital high frequency composite signal, generates a digital baseband signal, and outputs the generated digital baseband signal .

The dual audio code trigger control circuit may further include: a common burst management service dedicated circuit dedicated to receiving and transmitting a common emergency event signal.

The transmitting device may further include: a digital high frequency synthesizer for synthesizing the digital high frequency composite signal from the digital high frequency modulator into a digital high frequency broadband composite signal.

The receiving device may further include: a digital high frequency receiving and distributing circuit, configured to allocate the digital high frequency composite signal from the transmitting device as a normal broadcast signal and a common emergency event signal during shutdown or standby; and an automatic power on trigger control circuit , when receiving the shutdown or standby of the receiving device, receiving a common emergency event signal during shutdown or standby, waking up the digital high-frequency signal demodulation circuit, causing the digital high-frequency signal demodulation circuit to be in a working state, and receiving the public burst Transmit event signal demodulated to have a common burst The event-specific header and the signal-based digital baseband signal, when receiving the header, the automatic power-on trigger control circuit starts to work, outputs the control power, enables the lower-level digital decoding circuit to work, accepts the public emergency management service, and receives When the end of the letter is reached, the power is automatically turned off, and the receiving device is restored to the shutdown state.

The receiving device further includes: a combination switch, configured to place the reception of the digital high-frequency signal demodulation circuit to receive a common emergency event signal when the shutdown or standby is performed when the receiving device is powered off.

According to another aspect of the present invention, a method for a public emergency management service is provided, the method comprising: generating a control current according to the header when receiving a header from a common emergency event signal, Turning off the normal broadcast signal, and turning on the common burst event signal, when receiving the tail of the common burst signal, stopping outputting the control current and automatically turning on the normal broadcast signal; under the control of the generated control current, The public emergency signal is modulated into a digital high frequency composite signal; and the modulated digital high frequency composite signal is combined into a high frequency broadband composite signal and input to a wired or wireless transmission system.

According to another aspect of the present invention, a method for a public emergency management service is provided, the method comprising: receiving a transmitted public emergency event signal when a receiving device is powered off or standby; triggering a public to send The burst signal is demodulated to generate a digital baseband signal; when receiving the header of the generated digital baseband signal, a forced start current is generated, the receiving device is powered on, thereby receiving a common emergency event signal; and when received When the digital baseband signal is at the end of the signal, the trigger cuts off the forced start current, and the receiving device is restored to the shutdown state.

The invention has the following advantages:

1. The transmitting and receiving circuits are simple, low in cost and reliable in control.

2. The one-way transmission feature of CATV can be used to build a lower-level broadcast network in any required area, which saves a large amount of investment in network construction and has good implementability.

3. The automation and intelligence of its public emergency management services can be widely applied to natural disasters, group security incident emergency command systems, especially suitable for civil air defense, public emergency command systems in war, traffic emergency dispatch systems, especially applicable. Fire escape warning command system for fire protection.

4. In addition to transmitting conventional audio signals, the digital broadcast of the present invention can also transmit multimedia information such as text, pictures, and small amount of information to facilitate integration with various existing digital application tools.

5. Because of its wide selection of materials, it can be widely used in components, which is convenient for mass production.

6. While addressing the digitalization of broadcasting, we will focus on the development of a new type of emergency management service system that can be quickly and extensively promoted and does not require large government investment. Due to superior implementation Sexual innovations can fill the gap in this management service. DRAWINGS

The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction <

Figure 1 is a block diagram of a digital broadcast system of the present invention;

2 is a signal flow diagram of the digital broadcasting system of the present invention;

3 is a signal flow diagram of a public emergency management service of the present invention;

4 is a circuit diagram of a dual audio code trigger control circuit of the transmitting device of the present invention;

Figure 5 is a circuit diagram of a dedicated emergency management service dedicated circuit in the transmitting device of the present invention;

Figure 6 is a circuit diagram of a digital high frequency modulator in the transmitting device of the present invention;

Figure 7 is a circuit diagram of a digital high frequency synthesizer in the transmitting device of the present invention;

Figure 8 is a circuit diagram of a digital high-frequency receiving and distributing circuit in the receiving apparatus of the present invention; Figure 9 is a circuit diagram of a digital high-frequency demodulating circuit in the receiving apparatus of the present invention; and Figure 10 is a double of the receiving apparatus of the present invention A circuit diagram of the audio code trigger control circuit. detailed description

The present invention will be described in detail below with reference to the embodiments and drawings.

1 is a circuit block diagram of a technical structure in which a multifunctional, intelligent digital broadcasting system (wired and wireless dual-purpose) of the present invention and a public emergency management service thereof are implemented in combination. The method includes: digital broadcast information V1-Vn from a computer database (not shown), information Vf--Vn from a public emergency, the information header of the time period (slice) of the information is different Dual audio address encoding, representing the address encoding of each broadcast channel, where Vf represents a common burst management service dedicated channel address encoding, and its information signal tail has a unified dual audio encoding, representing a certain time period (slice) of the channel The information transmission ends. Set D1 - KDn and Kd dual audio code trigger control circuits, each with different address codes, representing different station channels, where Dl-KDn is the signal trigger control circuit normally broadcast by the station. Kd is a dedicated circuit for public trigger event management services. The Kd-Kn dual audio code trigger controller and signal switching circuit are set in the general broadcast station to ensure that all stations automatically switch to the public emergency management service broadcast when the public emergency management service is implemented, and the priority is occupied. In principle, the normal broadcast can be resumed automatically after completion. All of the two-tone encoding The trigger control can be actuated in its own dedicated header encoding trigger and output control current. The output control current can be automatically stopped when the unified end-of-line dual audio code is triggered. Kd-Kn can also cut off the normal broadcast signal while triggering the work, and turn on the common emergency management service signal; when the public emergency management service ends, the normal radio broadcast signal is automatically turned on. Tl, Τ2 - Τη are a plurality of digital high-frequency modulators, which are energized when the front-stage control current arrives, stop working when the control current ends, and modulate the digital baseband signals from the respective station channels into multi-channel digital high-frequency composite signals Vtl. , Vtf--Vtn. The digital high-frequency synthesizer H is arranged to synthesize the multi-channel digital high-frequency composite signal Vtl and VTF Vtn into a digital high-frequency broadband composite signal Vtxout, which is sent to the broadcast frequency band transmission of the cable television system to form a cable broadcasting system of a large area. Self-built high-frequency coaxial cable transmission system, construct a small-area self-use cable broadcasting system, or send the high-frequency broadband composite signal to the wireless broadband digital transmitting station to transmit wireless broadcasting signals (such as a digital TV transmitting station with about 56Mb) /S rate) constitutes a multi-channel wireless broadcast system.

A digital high-frequency receiving and distributing circuit Hs is disposed at the receiving end, and a cable broadcast signal from a cable television (CATV) broadcast band or a high-frequency coaxial cable transmission system and a wireless broadcast signal Vtx received from a high-frequency broadband wireless antenna are allocated as V. Two paths with Vts, one of which is broadcast as normal, for receiving normal broadcast signals. Use another Vts as the shutdown (standby) for public emergency management services. A digital high-frequency signal demodulation circuit Ts is provided for receiving the digital high-frequency composite signal to be demodulated into a digital baseband signal Vs with a dual audio header and information, which is sent to a mobile handset, MP3, MP4, PDA. Car audio, digital It can be used in terminals that can handle digital information sound, such as audio and computer audio. The DFs dual audio code trigger circuit is configured to, when the user shuts down, the SK combination switch of the circuit places the reception of the circuit TS at the receiving point of the receiving public emergency management service, and automatically receives the public emergency management service. At this time, both Ts and Dfs are in a low power sleep standby state. When there is a public emergency management service information, the Ts is activated and outputs a digital baseband signal with a header and tail-tone dual-audio code dedicated to the public emergency. The header encoding triggers Dfs to start working, and outputs a control current to enable the lower digital audio decoding amplifying circuit to operate, so that the user can automatically receive the public emergency management service. At the end of the service, the output control current is turned off at the end of the signal to return the receiver to the shutdown (standby) state. The receiving device can accept the management service of the public emergency in any state.

2 is a signal flow diagram of the digital broadcast system of the present invention. Referring to FIG. 2, the steps of the digital broadcasting method of the present invention are as follows: In step S210, a 'time division multiplexing multiplexed digital baseband signal is received, and the header of the information of each time period (slice) carries its own dual audio channel address coding. , the letter tail has a uniform The end of the dual audio encoding. In step S220, a control current is generated from the header dual audio address encoding trigger control circuit of the digital baseband signal, and the control current is turned off under the trigger of the double audio address encoding of the tail, waiting for the signal of the next time period (slice) to arrive. In step S230, the digital high frequency modulator starts operating under the control current to modulate the digital baseband signal into a digital high frequency composite signal. At the end of a period of time (chip) signal transmission, the control current is turned off, the operation is stopped, and the next signal cycle is awaited. In step S240, the multi-channel digital high-frequency composite signal is synthesized into one high-frequency broadband composite signal and sent to a wired or wireless transmission or transmission system. In step S250, the digital high frequency wideband signal is received and two paths are generated, one for normal station reception and the other for standby reception. In step S260, a digital high frequency composite signal is selected and the output digital baseband signal is demodulated and supplied to the lower level digital decoding amplification and restoration circuit.

3 is a signal flow diagram of a public emergency management service of the present invention. Referring to FIG. 3, in step S310, the header of the information of each time period (slice) of the digital baseband signal from the common burst management service is provided with a dedicated dual audio channel address code with a broadcast signal at the end of the signal. Unified dual audio encoding. In step S320, a control current is generated from the header encoding trigger control circuit of the digital baseband signal, and the general broadcasting station signal is simultaneously cut off in the general-purpose station, and the common emergency event signal is turned on. The output control current is stopped under the trigger of the tail code and the normal broadcast signal is automatically turned on. In step S330, the digital high frequency modulator is activated under the action of the control current, and the public emergency management service signal is modulated into a digital high frequency composite signal, and the public emergency management service automatically returns to normal under the action of the control circuit. Broadcast. In step S340, the multi-channel digital high-frequency composite signal is synthesized into a digital high-frequency broadband composite signal, which is sent to a wired transmission or a wireless broadcast transmission system. In step S350, the user is listening to any station, accepting the high frequency digital composite signal of the management service of the public emergency, and modulating the signal into a digital baseband signal for the next level of conventional digital decoding and amplifying circuit. In step S360, when the user manually shuts down, the demodulation circuit automatically enters the standby state and is in the receiving dedicated public emergency management service receiving point. In step S370, when a public emergency management service dedicated signal arrives, the demodulation circuit automatically enters an operating state and demodulates the signal into a digital digital baseband signal, and triggers the control circuit output under the signal header dedicated coding trigger. Force the power-on current to make the next-level digital decoding circuit work, accept the public emergency management service, and automatically resume the manual shutdown state at the end of the service.

4 is a circuit diagram of a dual audio code trigger control circuit of the transmitting device of the present invention. Referring to FIG. 4, the dual audio code trigger control circuit includes: a power supply V + , an integrated circuit Ic is a digital dual audio decoding integrated circuit CD4515 „ thyristor diodes D1, D2, D3, D4, D5, D6, D7, D8, Resistor Rl, R2, R3, R4, crystal switch tertiary tube G, normally closed relay K. Integrated circuit CD4515 Set the logic decoding circuit, where 1 pin and 24 pin are connected to the power supply; 2 pins and 3 pins receive the low frequency group d of a set of binary dual audio signals; 21 pins and 22 pins receive the high frequency group g of a set of binary dual audio signals , the binary dual audio signal is translated into a decimal dual audio signal; output from 20 feet, 9 feet, 10 feet, 8 feet, 7 feet, 6 feet, 5 feet, 4 feet, 18 feet, 17 feet respectively represent 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 decimal dual-tone signal; 12-pin grounding; G is the switching transistor, resistor R2 is the base biasing resistor of G, R3 is the emitter resistance of G, R1 - The collector load resistor of the terminal power supply V + is G also serves as the power supply protection resistor, and the resistors R2, R3 and the switching transistor G constitute the power switch circuit; the trigger control poles of the thyristors D1, D2, D3, D4, D5 are respectively connected to the CD4514 The dual audio coding 4th foot, 7th foot, 5th foot, 6th foot, and 9th foot form a decimal 47569 dual audio code, and its positive and negative poles are connected in series, wherein the D1 positive pole is connected to the K through the step-down protection resistor R4. Normally closed contact 2 feet, connected to power supply V + via contact 1 and D6 negative connected to resistor R2, group The dual audio code is the power-on trigger circuit of 47569; the trigger control poles of the thyristor diodes D6, D7, and D8 are respectively connected to the double-tone code of the CD4514, the 0-foot, the 1st foot, and the 2nd foot, which constitute the decimal dual-tone code of 012, which is positive The negative pole is connected in series, and the normally closed contact 2 pin of K and the positive end of D1 respectively constitute a 012 numbered trigger shutdown circuit. When the header of the public broadcast signal contains 47569 binary audio coding information sequence, the d group is input from the 2 pin and the 3 pin of the CD4514, and the g group is input from the 21 pin and the 22 pin of the CD4514, and the order is in the CD4514. The 7-pin, 4-pin, 6-pin, 5-pin, and 17-pin output decimal 47569 dual-audio pulse signals are sequentially turned on to enable the inter-crystalline diodes D1, D2, D3, D4, and D5 to make the power supply from K1. The base of the foot, the second leg, the resistor R4, D1 ~ D5, and the resistor R2 to G, then G is turned on by the base bias voltage, so that the collector c and the emitter e of G have a current passing through The emitter output controls the current Vx. When the signal has a double-audio signal of 012, the thyristor diodes D6, D7, and D8 are sequentially turned on, respectively. Under the shunt of R4, a larger current is passed from the control line diagram of K, so that K works to open the normally closed contact 1 pin, 2 pin, so that all the thyristor diodes lose power and turn off the conduction, so that the transistor G loses the base bias voltage and turns off, stops the output control current Vx, makes the whole circuit In a standstill state, waiting for the next information cycle to arrive. The trigger poles of Dl, D2, D3, D4, and D5 are respectively connected to CD4515 with different dual audio codes to form address codes of multiple channels. This circuit can form up to nearly 100,000 channel address codes.

Figure 5 is a circuit diagram of a dedicated emergency management service dedicated circuit in the transmitting device of the present invention. As shown in the figure, the public emergency management service dedicated circuit includes: power supply V + , integrated circuit Ic is CD4514; resistors Rl, R2, R3, R4, R5; thyristor D1, D2, D3, D4, D5, D6 , D7, D8; Switch Transistor G; Normally closed relay Kl; Combined relay Kf, Among them, 1 pin and 2 pin are normally closed electric shock, 3 feet and 4 feet are normally open contacts, 1 pin is connected to the radio signal input as Vin, 2 pin output is Vout, and 3 pin is connected to the common emergency event signal input as Vfm. The 4-pin output is Vfout. The integrated circuit CD4514 is a dual audio decoding circuit with a logic decoding circuit that translates two sets of binary audio signals into a decimal dual audio signal. 1 foot 24 feet connected to the power supply; 2 feet, 3 feet connected d group binary signal; 21 feet, 22 feet connected g group binary signal; 12 feet grounded; 20 feet, 9 feet, 10 feet, 8 feet, 7 feet, 6 feet , 5 feet, 4 feet, 18 feet, 17 feet respectively output decimal dual tone signal representation codes representing 0, 1, 2, 3, 4, 5, 6, 7, 8, 9; G is a crystal switching transistor, R2 For the base bias resistor, R3 is the emitter resistor, R5 is the collector load resistor and the other end is connected to the power supply V+ to form the switch circuit; the thyristor diodes D1, D2, D3, D4, D5, D6 are connected in series. The D1 positive pole is connected to one end of the control coil of the combined relay Kf, and the other end thereof is connected to the electric shock 2 of the normally closed relay K1 via the resistor R4, and the 1st pin is connected to the power supply V+; the negative pole of the D6 is connected to the resistor R2. The trigger poles of the thyristor diodes D1, D2, D3, D4, D5, and D6 are respectively connected to the 17-pin, 6-pin, 8-pin, 4-pin, and 5-pin of the IcCD4514, and constitute a dual-tone public emergency event management represented as 95376. Signal trigger circuit for service-dedicated channel address coding (which can also be coded according to actual needs). The positive and negative poles of the thyristor diodes D6, D7 and D8 are connected in series, the negative pole of D8 is connected to the positive pole of D1, the positive pole of D6 is connected to one end of the control coil of normally closed relay K1, and the other end is connected to the power supply V+. The trigger poles of the thyristor diodes D6, D7, and D8 are respectively connected to the 20-pin, 9-pin, and 10-pin of the IcCD4514, and constitute a dual-tone code trigger control circuit numbered 012. When the digital baseband information of the public emergency management service arrives, the binary binary audio signal 95367 of the header is sequentially connected to the 2, 3, 21, and 22 pins of the IcCD4514, and is translated into decimal code by the internal circuit, respectively. The 17-pin, 6-pin, 8-pin, 4-pin, and 5-pin outputs are pulse signals of 95367, which trigger the thyristors D1, D2, D3, D4, D5, and D6 to turn on, respectively, so that the power supply V+ passes through Kl. The 1st and 2nd pins, the control coils of the resistors R4 and Kf, and the resistor R2 reach the base of G, and the base of G is biased and starts to operate. The power supply V + passes through the resistor R5, the collector c, and outputs the control current Vx to the emitter e, while the current flows through the coil of Kf. Disconnect the normally closed contact 1 pin, 2 pin, interrupt the normal broadcast signal V, connect the normally open contact 3 pin, 4 pin, so that the common emergency management service information Vf passes, and all the common stations must be forced to serve the public priority. Emergency management service application system. When the public emergency management service ends, the thyristors D6, D7, and D8 are turned on under the trigger of the Han audio signal encoded by the tail 012, so that the control coil of the power supply V + often closes the relay, due to the shunt of the resistor R4. To make the current of the K1 coil larger, the K1 action opens the normally closed contact 1 and 2 feet, and D1, D2, D3, D4, D5, D6, D7, D8 are turned off due to power loss in an instant. In standby mode, Kf stops working. Connect the normally closed contact 1 pin and 2 pin to make the general radio station resume normal operation. At the same time, disconnect the normally open contact 3 pin and 4 pin, and wait for the next public emergency management service information to arrive.

Figure 6 is a circuit diagram of a digital high frequency modulator in the transmitting device of the present invention. As shown, the digital high frequency modulator includes the power supply V + , the integrated circuit Ic CMX017 resistors Rl, R2, R3, R4, R5, the adjustable resistors Rwl, Rw2, the varactor diode Vd, the capacitors Cl, C2, C3, C4 , C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, inductors Ll, L2, L3, L4, L5. Ic CMX017 is equipped with voltage controlled oscillator, modulator, gain control, clock oscillation, power saving standby, power amplifier and other circuits. 1 pin is the first stage power amplifier power supply; 2 feet are gain control; 3 feet, 4 feet, 5 feet, 7 feet, 8 feet, 10 feet, 11 feet, 14 feet, 15 feet, 17 feet, 19 feet, 21 Feet and 27 feet are grounding feet; 6 feet are the first power amplification, 9 feet are the second power amplification output, 16 feet are the adjustment enable (the invention is empty), 13 feet are the power amplifier enable (the invention is empty) 12 feet are the second power amplifier power supply, 26 feet are the modulator output, 28 feet are the power amplifier input, 18 pins are the modulator input, 22 feet and 24 feet are connected to the power supply. Two of them are connected to Rwl and capacitors Cl and C2 to form a gain control circuit. L5 is the power inductive coil; inductor Ll, L2 and capacitor C3 form the impedance circuit; C14 is the decoupling capacitor; C5, C6 are the coupling capacitor; L6 is the decoupling matching inductor, 23 pin capacitor, C7 is the oscillation output and external Frequency synthesizer or frequency lock-in circuit (not shown in the present invention), capacitors C8, C9, C10, inductor L4, varactor diode Vd together constitute an oscillating circuit input from 20 feet, resistors Rl, R4, R5, adjustable resistor Rw2 (Adjustable positive oscillation intensity) constitutes the oscillator power supply circuit; Capacitors C11, C12, C13, C14 are decoupling capacitors. R2 and R3 are signal input stabilizing resistors. When there is digital baseband information (general radio or public emergency management service information) from N point through R2 resistor input to 18 feet, after Ic CMX017 internal circuit modulation, after the driver stage, power amplification from 26 feet output, through the capacitor C5, C6 are coupled to 28 feet, after the first stage power amplification, after the second stage power amplification, the L1 inductor of the impedance matching circuit is output at the 9th pin, and the C3 capacitor Rfout RF port outputs the high frequency digital composite signal, changing the oscillation frequency. RF outputs of different frequencies can be formed.

Figure 7 is a circuit diagram of a digital high frequency synthesizer in the transmitting device of the present invention. As shown, the digital high frequency synthesizer includes a high frequency core H, a primary coil L1, L2, Ln wound around the core H, and a secondary line 圏 Lx. When the multi-channel digital high-frequency signals Vtl, Vtf, and Vtn are respectively input to L1, L2, and Ln, a high-frequency digital broadband composite signal is generated in the secondary by electromagnetic induction, and is outputted at the Vtxout terminal.

Figure 8 is a circuit diagram of a digital high frequency receiving and distributing circuit in the receiving apparatus of the present invention. As shown, the digital high frequency receiving and distributing circuit includes a high frequency magnetic core hs, a primary coil L1 wound around the magnetic core hs, Secondary coils L2, L3, wherein L3 is connected with inductors L4, L5, L6, and capacitors Cl, C2, C3 form a bandpass filter, which can only receive the frequency of the common emergency management service information. Wired high-frequency digital bandwidth composite signal transmitted from high-frequency cable or wireless high-frequency digital bandwidth composite signal received from high-frequency broadband antenna, input from Vtxsin, under the action of high-frequency electromagnetic wave, generate two high-frequency in the secondary The digital broadband composite signal is output from Vsout and Vsfout, respectively.

Figure 9 is a circuit diagram of a digital high frequency demodulation circuit in the receiving device of the present invention. As shown, the digital high-frequency demodulation circuit includes a power supply V + , an integrated circuit Ic CMX018, resistors R1, R2, R3, R4, R5, R6, an adjustable resistor Rw, capacitors Cl, C2, C3, C4, C5, C6, C7, C8, C9, C10, Cl l, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25 (semi-adjustable), C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, varactor diode Vd, inductor Ll, L2, L, L4, L5, L6, L8, L9, L10, Ll l, L12, switch Swl , Sw2, bandpass filter, Bpf. Pin 1 of the integrated circuit Ic CMX018 is a low noise amplifier input; pins 2, 4, 7, 10, 24 are grounded, 3 is a low noise amplifier output, and 5 is a first stage mixing input, 6 The pin is the first-stage mixing output, the 8-pin is the second-stage mixing input, the 9-pin is the second-stage mixing output, the 11-pin is the limiting amplification input, and the 12-pin and 13-pin are the limiting amplification decoupling, 14 The pin is the limit amplification intensity indication, the 15 pin is the 90 degree phase shift input, the 16 pin is the limit amplification output, the 17 pin is the demodulator power supply, the 18 pin is the modulator output, and the 19 pin is the Kaulz oscillator emitter. 20 is the base of the Kaul oscillator, 21 is the oscillator output, 22 is the oscillation power supply, 23 is the input of the oscillation circuit, 25 is the low noise amplification, and 26 is the capacitor C20, which is the decoupling of the amplifier. The 27-pin is the gain setting and the 28-pin is the enable control. The CMX018 is equipped with low noise amplification, voltage controlled oscillation, limiting amplification, first intermediate frequency amplification, second intermediate frequency amplification, and demodulator. C13 is the first middle-discharge coupling capacitor, connected to 3 feet and 5 feet; 6-pin capacitors Cl l, C12, C10, C9, C8, C7, C6, C5, C4, C3; inductors Ll, L2, L12 form the first The second middle-mounted peripheral circuit is input to pin 8 through capacitors C14 and C15; the 9-pin output is second-stage, and is amplified by inductor L3, band-pass filter Bpf2, and inductor L4 input 11 pin. C16 is a decoupling capacitor; C17 and C18 are limiting amplification and retracting capacitors. 16-pin limiting amplification through C24 capacitor input 15 feet; half-modulating capacitor C25, capacitor C26, C27, resistor R6, inductor L10 to form a peripheral 90-degree phase shift circuit; 19-pin, 20-pin inductor L8, L9; capacitor C28, C29, C30, crystal oscillator Hd, and resistor R5 form a Kaurz oscillation peripheral circuit. The oscillating signal is output through pin 21, connected to the inductor L7, connected to the power supply V +, and connected to the test point via the capacitor C23. 23-pin capacitors C22, C31, C32, C33, C34, C35, varactor diode Vd, inductor Ll l, L15, resistor R4, adjustable resistor Rw form a Kaurz oscillation peripheral circuit; capacitor C33 is the oscillation test point, Adjusting Rw controls the oscillation intensity. C20 is the decoupling capacitor of the amplifier. The resistors R2 and R3, the capacitor C21 and the switch Sw2 form a gain control circuit. When Sw2 is disconnected, it is in a high gain state. Resistor Rl, R7, capacitor C19, switch Swl form a mode control circuit, connected to 28 feet, Swl is in the receiving state when it is on, and is in low power (ΙΟ μ Α) sleep state when it is off. When the tuned circuit (not shown) receives the Vsout high-frequency digital signal from the general-purpose station, it is input by the IcCMX018 1 pin, processed by the internal circuit, and amplified by the 18-pin digital baseband signal to the lower-level digital decoding to audio, video, Displayed after text processing. It can be a mobile phone, MP3, MP4, PDA, etc. When the user is turned off, Swl is in the off state, and the receiving input point IN is automatically connected to the Vf point of Figure 8 (switching under the action of the combined power switch SK when turning on and off). When a public emergency management service signal arrives, CMX018 works, Swl automatically turns on, and pin 18 outputs public emergency management service information.

Figure 10 is a circuit diagram of a dual audio code trigger control circuit in the receiving device of the present invention. As shown, the dual audio code trigger control circuit 240 includes a power supply V+, a dual audio decoding integrated circuit Ic CD4514, thyristors D1, D2, D3, D4, D5, D6, D7, D8, and resistors R1, R2. R3, normally closed relay Kl, double normally open relay Κ2, manual combination switch Sk. Thyristor diodes Dl, D2, D3, D4, D5, positive and negative poles connected in series, D1's positive pole connected to resistor R2; normally closed relay normally closed contact 1 pin, 2 pin connected to power supply; D6's negative terminal connected to double normally open relay K2's control coil, grounded via resistor R3, K2's contact 1 is connected to the power supply V +, 2 feet are connected to the power supply manual switch lower end, 3 feet, 4 feet according to the Swl end of Figure 9; its D1 - D6 trigger pole Connect the CD376's 95376 dual audio number to indicate the foot, form the dual audio code start control circuit with the dual tone number 95376; the positive and negative terminals of the thyristor are connected in series, the positive pole of D6 is controlled by the K1 control coil 2, D8 The negative pole is connected to the positive pole of D1; the trigger poles of D6 ~ D8 are respectively connected to the 012 dual-tone representation pin of CD4514, and the shutdown circuit of the dual audio code is 012. When the 95376 dual audio binary information in the header of the public emergency management service information arrives, it is sequentially input to the 2, 3, 22, and 23 pins of the IcCD4514, and is translated into the decimal audio code 95376, and 9 Foot, 5 feet, 8 feet, 4 feet input, respectively trigger D1 ~ D6 conduction, so that the power supply often closes the relay contact 1 pin, 2 pin, D1 ~ D5, double control relay K2 control coil, protection resistor R3 lead Pass, then K2 action, turn on contact 1 pin, 2 pin, supply power to the lower level circuit, forcibly turn on the power, turn on contact 3 pin, 4 pin, so that IcCMX018 of Figure 9 is released from standby. When the public emergency management service ends, the thyristors D6, D7, and D8 are respectively turned on under the trigger of the 012 signal at the end of the information signal, so that the control coil of the normally closed relay K1 is energized. Due to the shunting action of the resistor R2, more current is passed, and the pin 1 and pin 2 of K1 are disconnected at a moment, then D1 ~ D8 are in the off state due to power loss, and then Kl, Κ2 are restored to the original standby state. Stop powering the next stage circuit.

Although the present invention has been particularly shown and described with reference to the exemplary embodiments thereof, it will be understood by those skilled in the art Various changes on it.

Claims

Rights request

A digital broadcast system for public emergency management service prioritization, comprising: a transmitting device, receiving a header and a tail of each station information that is divided into time segments (slices) from a computer, said The header sets the respective dual audio identification codes, and the letter tail sets a unified dual audio control code, and the transmitting device has:

The dual audio code triggering control circuit of multiple stations can only output the control current when the signal of the station is received by the trigger signal of the station, and when the header of the public emergency signal is received, according to the header Controlling the current, cutting off the normal broadcast signal and turning on the common emergency event signal, when receiving the signal tail of the common emergency event signal, stopping outputting the control current and automatically turning on the normal broadcast signal;

a digital high frequency modulator that modulates the station signal and the common burst event signal into a digital high frequency composite signal under the control current from the dual audio coded trigger control circuit;

a receiving device having:

The digital high frequency signal demodulation circuit receives the digital high frequency composite signal from the transmitting device, demodulates the received digital high frequency composite signal, generates a digital baseband signal, and outputs the generated digital baseband signal.

2. The digital broadcast system according to claim 1, wherein the dual audio code trigger control circuit further comprises: a common burst management service dedicated circuit specifically for receiving and transmitting a common burst event signal.

3. The digital broadcasting system according to claim 1, wherein the transmitting device further comprises: a digital high frequency synthesizer for synthesizing the digital high frequency composite signal from the digital high frequency modulator into one digital high frequency broadband Composite signal.

4. The digital broadcasting system according to claim 1, wherein the receiving device further comprises: a digital high frequency receiving and distributing circuit configured to allocate the digital high frequency composite signal from the transmitting device to a normal broadcast signal and to turn off or a public emergency signal during standby; and

The automatic power-on trigger control circuit is configured to receive a public emergency event signal when the receiving device is powered off or in standby, triggering a digital high-frequency signal demodulation circuit, so that the digital high-frequency signal demodulation circuit is in a working state, and will receive The public emergency signal is demodulated into a digital baseband signal with a header and a tail of a common emergency. When the header is received, the automatic power-on trigger control circuit starts to work, and the control power is output to enable the lower level. Digital decoding circuit works, accepting public emergencies The piece management service, when receiving the end of the letter, automatically cuts off the power, and restores the receiving device to the shutdown state.

The digital broadcasting system according to claim 4, wherein the receiving device further comprises: a combination switch, configured to: when the receiving device is powered off, place the reception of the digital high-frequency signal demodulation circuit at the time of receiving shutdown or standby Public emergency signal.

6. A method for a public emergency management service, the method comprising:

When receiving a header from the common burst signal, generating a control current according to the header, cutting off the normal broadcast signal, and turning on the common burst event signal, when receiving the tail of the common burst signal, Stop outputting control current and automatically turn on normal broadcast signal;

Modulating the common burst signal into a digital high frequency composite signal under control of the generated control current;

The modulated digital high frequency composite signal is synthesized into a high frequency broadband composite signal and input to a wired or wireless transmission system.

7. A method for a public emergency management service, the method comprising:

Receiving a transmitted public emergency event signal when the receiving device is powered off or standby;

Triggering to demodulate the transmitted common burst signal to generate a digital baseband signal; upon receiving the header of the generated digital baseband signal, generating a booting current to enable the receiving device to power up, thereby receiving a common emergency event signal;

When the signal tail of the generated digital baseband signal is received, the power-off current is triggered to turn off the receiving device to the power-off state.

8. A digital broadcast transmitting device for public emergency event management service, comprising: a dual audio code trigger control circuit, when receiving a header of a public emergency event signal, generating a control current according to the signal header, cutting off normal Broadcasting the signal and turning on the common emergency event signal, when receiving the signal tail of the common emergency event signal, stopping outputting the control current and automatically turning on the normal broadcast signal;

The digital high frequency modulator modulates the common burst event signal into a digital high frequency composite signal under the control current from the Han audio code trigger control circuit.

The digital broadcast transmitting apparatus according to claim 8, wherein said dual audio encoding trigger control circuit further comprises: a common burst management service dedicated circuit exclusively for receiving and transmitting a public burst signal.

10. The digital broadcast transmitting apparatus according to claim 8, further comprising: a digital high frequency synthesizer, It is used to synthesize a digital high frequency composite signal from a digital high frequency modulator into a digital high frequency broadband composite signal.