CN214281411U - Broadcast talkback gateway terminal - Google Patents
Broadcast talkback gateway terminal Download PDFInfo
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- CN214281411U CN214281411U CN202120343603.7U CN202120343603U CN214281411U CN 214281411 U CN214281411 U CN 214281411U CN 202120343603 U CN202120343603 U CN 202120343603U CN 214281411 U CN214281411 U CN 214281411U
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Abstract
The utility model discloses a broadcasting gateway terminal of talkbacking, include: the control panel is provided with a control module, a network interface module connected with the control module, an audio coding and decoding module, an audio interface module and a call control module; the audio coding and decoding module is connected with the audio interface module; the audio interface module includes: the power amplifier unit is connected between the audio output unit and the audio output unit; through built-in high performance power amplifier, the analog audio signal that will have converted is exported again behind high performance power amplifier, need not external power amplifier can the lug connection speaker, and audio output can realize effectively covering to the large tracts of land region, and when broadcasting FM signal accident that the front end equipment sent was interrupted or can't realize emergent broadcasting when receiving the interference, can need not external power amplifier, lug connection passive audio amplifier or speaker, audio output can realize effectively covering to the large tracts of land region.
Description
Technical Field
The utility model relates to the field of communication technology, concretely relates to broadcasting gateway terminal of talkbacking.
Background
The intelligent broadcasting system is a broadcasting system which provides comprehensive broadcasting information for vast rural masses by using modern broadcasting, controlling and transmitting means. The intelligent broadcasting network construction is an important content for promoting the construction of a public culture service system by the nation, and is a civil engineering, a civil-rich engineering and a guarantee engineering. The broadcasting is an important tool and carrier for realizing policy and regulation propaganda, knowledge popularization, cultural education and entertainment, information transmission, public emergency command and agricultural weather broadcasting. The intelligent broadcast network system is also called an emergency broadcast loud speaker system, a village sound system, a comprehensive information broadcast system and the like.
However, on the one hand, in the existing intelligent broadcasting system, generally, an audio-based broadcasting mode is adopted, the transmission means is single, the networking situation of the application in a complex environment is not considered, the reliability is poor, when the broadcast frequency modulation signal sent by the front-end equipment is interrupted accidentally or is interfered, emergency broadcasting cannot be realized, and a loudspeaker is required to be connected after the power amplifier is connected when the broadcasting is carried out, the external equipment is complex in use, time and labor are wasted, the maintenance cost is high, the whole intelligent broadcasting system is complex in equipment, large in size and limited in audio output area.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a gateway terminal is talkbacked in broadcast improves based on current gateway terminal is talkbacked in broadcast, and built-in high performance power amplifier need not external power amplifier can the lug connection speaker, and audio output can realize effectively covering to the large tracts of land region.
The utility model discloses a following technical scheme realizes:
the utility model provides a broadcasting gateway terminal of talkbacking, include: the control panel is provided with a control module, a network interface module connected with the control module, an audio coding and decoding module, an audio interface module and a call control module; the audio coding and decoding module is connected with the audio interface module; the audio interface module includes: the power amplifier comprises an audio input unit, an audio output unit and a power amplification unit, wherein the power amplification unit is connected between the audio output unit and the audio output unit.
The working principle of the scheme is as follows: this scheme is based on current broadcast gateway terminal of talkbacking improves, and built-in high performance power amplifier need not external power amplifier can the lug connection speaker, and audio output can realize effectively covering to the large tracts of land region, and when broadcasting FM signal accident that the front end equipment sent was interrupted or can't realize emergent broadcast when receiving the interference, can need not external power amplifier, and lug connection passive audio amplifier or speaker, audio output can realize effectively covering to the large tracts of land region.
The further optimization scheme is that the audio coding and decoding module supports G.722 high-definition broadband voice coding, (16KH sampling rate), the voice quality of SIP voice communication can be greatly improved, and the high-quality communication experience of the SIP broadcast terminal is guaranteed.
The further optimization scheme is that the control module comprises: the system comprises a magnetic control entrance guard interface unit, a sensing interface unit, an audible and visual alarm interface unit and a keyboard input interface unit.
The control module can be connected with various sensors, a door magnet, an audible and visual alarm, a trigger broadcast, door magnet switch control and other automatic security control functions.
The further optimization scheme is that the power amplification unit consists of a class D power amplifier.
The further optimization scheme is that the D-type power amplifier is formed by sequentially connecting a PWM (pulse-width modulation) circuit, a switch power amplifier circuit and an output filter.
The structure of the class D amplifier has two categories of symmetry and asymmetry, and the class D power amplifier adopted by the scheme aims at the portable application which is very sensitive to power and volume, so that the symmetrical amplifier of a full bridge is adopted to fully utilize the characteristics of a single power supply and system miniaturization.
The further optimized scheme is that the PWM modulation circuit is fixed in frequency and consists of a double-path comparator and a triangular wave generator; the audio input unit and the triangular wave generator are respectively connected with one input end of the two-way comparator;
the switch power amplifier circuit comprises a driving circuit and an H-bridge switch circuit; the output end of the double-path comparator is connected with a driving circuit and an H-bridge switching circuit;
the PWM circuit with fixed frequency consisting of a comparator and a triangular wave generator is adopted, the amplitude of an input audio signal is used for modulating the triangular wave to obtain a square wave with the duty ratio changing along with the amplitude of the audio input signal, the power tubes of an upper bridge arm and a lower bridge arm are driven in opposite phases, one power tube is switched on, the other power tube is switched off, and then the square wave is converted into an audio signal through an output filter to push a loudspeaker to produce sound; the D-class amplifier adopting the full bridge can realize balanced output, is easy to improve the output filtering characteristic of the amplifier and can reduce interference; the peak value of the voltage on the load of the full bridge circuit is close to 2 times of the power voltage, and a single power supply can be adopted for supplying power. In practice, the 2 output pulses are usually in opposite phases.
The further optimization scheme is that the circuit structure of the two-way comparator is as follows:
the audio input unit is connected with a negative port 2 of the LM311 comparator through a capacitor C8, the triangular wave generator is connected with a positive port 3 of the LM311 comparator through a capacitor C9, the negative port 2 of the LM311 comparator is connected with an external power supply VDD through a resistor R1, the negative port 2 of the LM311 comparator is grounded through a resistor R2, the positive port 3 of the LM311 comparator is connected with the external power supply VDD through a resistor R3, the positive port 3 of the LM311 comparator is grounded through a resistor R4, a VCC-port 4 and an EMI OUT port 1 of the LM311 comparator are both grounded, a VCC + port 8 of the LM311 comparator is connected with the external power supply VDD, an output port 7 of the LM311 comparator is connected with the external power supply VDD through a resistor R5, and the output port 7 is connected with the audio output unit.
In order to improve the system efficiency and reduce unnecessary opening and closing of a CMOS (complementary metal oxide semiconductor) tube in a rear-stage H bridge, two paths of triangular waves with different biases are respectively compared with the upper half part and the lower half part of an audio signal, when the potential on the positive end is higher than that of the negative end, the output of a comparator is high level, otherwise, the output of low level is low level.
The further optimization scheme is that the broadcast talkback gateway terminal adopts a PoE network cable for power supply.
The power supply and the communication only need a net twine that supports POE can, and the installation is simple convenient, if need external power under the application scene, also can use other powers to supply power for equipment.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model provides a pair of gateway terminal is talkbacked in broadcast, through at the built-in high performance power amplifier of gateway terminal is talkbacked in the broadcast, analog audio signal that will have changed is through high performance power amplifier output, need not external power amplifier can the lug connection speaker, audio output can realize effectively covering to the large tracts of land region, when broadcasting FM signal accident that the front end equipment sent was interrupted or can't realize emergent broadcasting when receiving the interference, can need not external power amplifier, lug connection passive audio amplifier or speaker, audio output can realize effectively covering to the large tracts of land region.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a broadcast talkback gateway terminal system;
FIG. 2 is a schematic diagram of a class D power amplifier;
fig. 3 is a schematic circuit diagram of the dual-path comparator.
In the drawings:
the system comprises a control panel 1, a control module 2, a magnetic control entrance guard interface unit 21, a sensing interface unit 22, an audible and visual alarm interface unit 23, a keyboard input interface unit 24, a network interface module 3, an audio coding and decoding module 4, an audio interface module 5, an audio input unit 51, an audio output unit 52, a power amplification unit 53 and a call control module 6.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a broadcast intercom gateway terminal, including: the system comprises a control panel 1, wherein a control module 2, a network interface module 3 connected with the control module 2, an audio coding and decoding module 4, an audio interface module 5 and a call control module 6 are arranged on the control panel 1; the audio encoding and decoding module 4 is connected with the audio interface module 5, and the audio interface module 5 includes: an audio input unit 51, an audio output unit 52, and a power amplification unit 53, the power amplification unit 53 being connected between the audio input unit 51 and the audio output unit 52.
(the audio input unit 51 provides a 3.5mm microphone access interface and an electret condenser microphone; the audio output unit 52 provides a 20W, 80 omega, 3.5mm headphone output interface, a 20W, 80 omega, 3.5mm/80mW, 16 omega headphone output).
The audio coding and decoding module 4 supports g.722 high-definition wideband speech coding. (16KH sampling rate), the voice quality of SIP voice communication can be greatly improved, and the high-quality communication experience of the SIP broadcast terminal is ensured.
The control module 2 includes: a magnetic control entrance guard interface unit 21, a sensing interface unit 22, an audible and visual alarm interface unit 23 and a keyboard input interface unit 24.
The power amplifying unit 53 is composed of a class D power amplifier.
As shown in fig. 2, the class D power amplifier is formed by connecting a PWM modulation circuit, a switching power amplifier circuit, and an output filter in sequence.
The PWM modulation circuit is fixed in frequency and consists of a double-path comparator and a triangular wave generator; the audio input unit 52 and the triangular wave generator are respectively connected with one input end of the two-way comparator;
the switch power amplifier circuit comprises a driving circuit and an H-bridge switch circuit; the output end of the double-path comparator is connected with a driving circuit and an H-bridge switching circuit;
the output filter is a low pass filter, and the H-bridge switch circuit is connected to the audio output unit 52 after being connected to the low pass filter.
As shown in fig. 2, the circuit structure of the two-way comparator is:
the audio input unit 51 is connected with a negative port 2 of the LM311 comparator through a capacitor C8, the triangular wave generator is connected with a positive port 3 of the LM311 comparator through a capacitor C9, the negative port 2 of the LM311 comparator is connected with an external power supply VDD through a resistor R1, the negative port 2 of the LM311 comparator is grounded through a resistor R2, the positive port 3 of the LM311 comparator is connected with the external power supply VDD through a resistor R3, the positive port 3 of the LM311 comparator is grounded through a resistor R4, a VCC-port 4 and an EMI OUT port 1 of the LM311 comparator are both grounded, a VCC + port 8 of the LM311 comparator is connected with the external power supply VDD, an output port 7 of the LM311 comparator is connected with the external power supply VDD through a resistor R5, and the output port 7 is connected to the audio output unit 52.
The parameters of the components are as follows: the external power supply VDD is 5V, the resistor R1, the resistor R3 and the resistor R5 are 1K omega, and the resistor R2 and the resistor R4 are 10K omega.
And the broadcast talkback gateway terminal adopts a PoE network cable for power supply.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A broadcast intercom gateway terminal, comprising: the system comprises a control panel (1), wherein a control module (2), a network interface module (3) connected with the control module (2), an audio coding and decoding module (4), an audio interface module (5) and a call control module (6) are arranged on the control panel (1); the audio coding and decoding module (4) is connected with the audio interface module (5), and the audio interface module (5) comprises: an audio input unit (51), an audio output unit (52), and a power amplification unit (53), the power amplification unit (53) being connected between the audio input unit (51) and the audio output unit (52).
2. The broadcast talkback gateway terminal according to claim 1, wherein the audio codec module (4) supports g.722 high definition wideband speech coding.
3. A broadcast talkback gateway terminal according to claim 1, wherein the control module (2) comprises: the system comprises a magnetic control entrance guard interface unit (21), a sensing interface unit (22), an audible and visual alarm interface unit (23) and a keyboard input interface unit (24).
4. A broadcast talkback gateway terminal according to claim 1, wherein the power amplification unit (53) is constituted by a class D power amplifier.
5. The broadcast talkback gateway terminal of claim 4, wherein the class D power amplifier is formed by sequentially connecting a PWM (pulse-width modulation) circuit, a switch power amplifier circuit and an output filter.
6. The broadcast talkback gateway terminal according to claim 5,
the PWM modulation circuit is fixed in frequency and consists of a double-path comparator and a triangular wave generator; the audio input unit (51) and the triangular wave generator are respectively connected with one input end of the two-way comparator;
the switch power amplifier circuit comprises a driving circuit and an H-bridge switch circuit; the output end of the double-path comparator is connected with a driving circuit and an H-bridge switching circuit;
the output filter is a low-pass filter, and the H-bridge switch circuit is connected with the low-pass filter and then connected to the audio output unit (52).
7. The broadcast talkback gateway terminal of claim 6, wherein the circuit structure of the two-way comparator is:
the audio input unit (51) is connected with a negative port 2 of the LM311 comparator through a capacitor C8, the triangular wave generator is connected with a positive port 3 of the LM311 comparator through a capacitor C9, the negative port 2 of the LM311 comparator is connected with an external power supply VDD through a resistor R1, the negative port 2 of the LM311 comparator is grounded through a resistor R2, the positive port 3 of the LM311 comparator is connected with the external power supply VDD through a resistor R3, the positive port 3 of the LM311 comparator is grounded through a resistor R4, a VCC-port 4 and an EMI OUT port 1 of the LM311 comparator are both grounded, a VCC + port 8 of the LM311 comparator is connected with the external power supply VDD, an output port 7 of the LM311 comparator is connected with the external power supply VDD through a resistor R5, and the output port 7 is connected with the audio output unit (52).
8. The broadcast intercom gateway terminal as in claim 1, wherein the broadcast intercom gateway terminal is powered by a PoE network cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120343603.7U CN214281411U (en) | 2021-02-05 | 2021-02-05 | Broadcast talkback gateway terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120343603.7U CN214281411U (en) | 2021-02-05 | 2021-02-05 | Broadcast talkback gateway terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214281411U true CN214281411U (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120343603.7U Active CN214281411U (en) | 2021-02-05 | 2021-02-05 | Broadcast talkback gateway terminal |
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| Country | Link |
|---|---|
| CN (1) | CN214281411U (en) |
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2021
- 2021-02-05 CN CN202120343603.7U patent/CN214281411U/en active Active
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