CN214338068U - CAT 1-based public network intercom system - Google Patents
CAT 1-based public network intercom system Download PDFInfo
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- CN214338068U CN214338068U CN202120420942.0U CN202120420942U CN214338068U CN 214338068 U CN214338068 U CN 214338068U CN 202120420942 U CN202120420942 U CN 202120420942U CN 214338068 U CN214338068 U CN 214338068U
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Abstract
The utility model discloses a public network intercom system based on CAT1, through constructing the service instruction list and passing through network protocol at the sending end and transmitting each service data to the lower floor after encapsulating according to its corresponding transmission protocol; and acquiring the service indication table at the receiving end and distinguishing data or services adopting different transmission protocols by analyzing the service indication table. The method can effectively solve the problem of compatibility of different transmission protocols, has small influence on the original protocol, is simple to realize and low in complexity, thereby improving the protocol applicability of the 5G broadcast and being used for solving the problem of compatibility among a plurality of independent transmission protocol systems in the prior art.
Description
Technical Field
The utility model relates to a signal transmission technical field especially relates to public network intercom system based on CAT 1.
Background
After the industry and informatization department officially issued 4G license plates to operators in 2013, the method declares that the communication industry of China has entered the 4G era; in 2020, the department of industry and informatization in 4 months also issues a notification (hereinafter, referred to as a notification) about deep advancement of the overall development of mobile internet of things, and the notification clearly indicates that the service migration and network switching of the 2G/3G internet of things are to be promoted, and it is mentioned that CAT1 meets the demand of medium-rate internet of things and the demand of voice. The CAT1 product access network belonging to 4G can seamlessly access the existing network environment without upgrading the hardware environment of the base station and changing the configuration of some parameters on software. Compared with 2G/3G, the CAT1 has high speed, low power consumption, low cost, small size and higher integration level, and compared with CAT4 and above, the CAT1 has the downlink speed of 10M and the uplink speed of 5M, but can meet the use scene of the internet of things with medium speed, so the CAT1 product has wide market application prospect.
However, CAT1 with low configuration, low speed and small coverage is only a remedy for the environment of the internet of things, and still needs 5G for coverage in a higher application speed, a wider, deeper and more complex use scenario, or needs to invest more resources.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings in the prior art, the present invention actually solves the technical problems as follows: the CAT 1-based public network intercom system can meet the requirement that a user can realize voice call and can seamlessly access an LTE public network under the precondition that a base station is not upgraded.
To achieve the above and other related objects, the present invention provides a CAT 1-based public network intercom system, comprising: the system comprises an LTE antenna module, a radio frequency front end module, a modulation and demodulation module, a BT/WLAN communication module and a power management and talkback function module; the radio frequency front end module is connected with the LTE antenna module, the modulation and demodulation module and the power management and talkback function module, and the BT/WLAN communication module and the power management and talkback function module are connected with the modulation and demodulation module; the LTE antenna module is used for receiving radio frequency signals from a base station and sending the radio frequency signals from the radio frequency front-end module; the radio frequency front end module is used for carrying out channel switching and filtering processing on the received radio frequency signals; the modulation and demodulation module is used for demodulating the radio frequency signal from the radio frequency front end module and the audio signal from the power management and talkback function module; the BT/WLAN communication module is used for transmitting radio frequency signals passing through the modulation and demodulation module through BT and/or WLAN; and the power management and talkback function module is used for respectively carrying out power management and carrying out digital-to-analog conversion on the radio frequency signal from the modulation and demodulation module or carrying out analog-to-digital conversion on the received audio signal.
In an embodiment of the present invention, the radio frequency front end module includes: the radio frequency power amplifier comprises a radio frequency switch, a filtering unit, a radio frequency power amplifier and a control switch.
In an embodiment of the present invention, the filtering unit includes: duplexers and/or filters.
In an embodiment of the present invention, the power management and intercom function module includes: and the power management and audio coding and decoding unit is used for respectively carrying out power management and carrying out digital-to-analog conversion on the radio frequency signal from the modulation and demodulation module or carrying out analog-to-digital conversion on the received audio signal.
In an embodiment of the present invention, the power management and intercom function module further includes: the audio PA unit and the playing unit are connected with the power management and audio coding and decoding unit and are used for amplifying and playing the signals subjected to digital-to-analog conversion; and/or the audio acquisition unit is connected with the power management and audio coding and decoding unit and is used for acquiring audio signals and sending the audio signals to the power management and audio coding and decoding unit so as to perform analog-to-digital conversion on the audio signals.
In an embodiment of the present invention, the modem module includes: a modem integrated with a radio frequency transceiver and a bluetooth radio frequency.
In an embodiment of the present invention, the power management and audio encoding and decoding unit includes: the system comprises a power management subunit, an audio coding and decoding subunit and a user interface support function subunit.
In an embodiment of the present invention, the modem module and/or the power management and audio encoding and decoding unit includes: one or more extensible interfaces.
In an embodiment of the present invention, the BT/WLAN communication module includes: a BT/WLAN filter and a BT/WLAN antenna connected to the BT/WLAN filter.
In an embodiment of the present invention, the public network intercom system further includes: and the modulation and demodulation module is connected with one or more of a SIM card module circuit, a USB module circuit and a PTT module circuit.
As above, the utility model discloses a public network intercom system based on CAT1, through the LTE antenna module that sets up in the system, radio frequency front end module, modem module, BT/WLAN communication module and power management and the basic platform of talkbacking function module realization LTE network cover on CAT1, not only satisfy the customer operation requirement under the medium rate, still possess BT/WLAN function simultaneously, this public network intercom system can be under the condition of not upgrading the basic station hardware environment, insert the LTE network and realize the function of talkbacking, can break through the distance restriction of traditional intercom, the occasion restriction, the frequency restriction, and have lower development cost.
Drawings
Fig. 1 is a schematic structural diagram of a CAT 1-based public network intercom system according to an embodiment of the present invention.
Fig. 2a is a schematic structural diagram of a CAT 1-based public network intercom system according to an embodiment of the present invention.
Fig. 2b is a schematic structural diagram of a CAT 1-based public network intercom system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a radio frequency front end module according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a power management and intercom function module according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a BT/WLAN communication module according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a public network intercom PCBA system based on CAT1 according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a radio frequency front end according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily carry out the present application. The present application may be embodied in many different forms and is not limited to the embodiments described herein.
In order to clearly explain the present application, components that are not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.
Throughout the specification, when a component is referred to as being "connected" to another component, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another element interposed therebetween. In addition, when a component is referred to as "including" a certain constituent element, unless otherwise stated, it means that the component may include other constituent elements, without excluding other constituent elements.
When an element is referred to as being "on" another element, it can be directly on the other element, or intervening elements may also be present. When a component is referred to as being "directly on" another component, there are no intervening components present.
Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are described. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" include plural forms as long as the words do not expressly indicate a contrary meaning. The term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but does not exclude the presence or addition of other features, regions, integers, steps, operations, elements, and/or components.
Terms indicating "lower", "upper", and the like relative to space may be used to more easily describe a relationship of one component with respect to another component illustrated in the drawings. Such terms are intended to include not only the meanings indicated in the drawings, but also other meanings or operations of the device in use. For example, if the device in the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "under" and "beneath" all include above and below. The device may be rotated 90 or other angles and the terminology representing relative space is also to be interpreted accordingly.
Although not defined differently, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms defined in commonly used dictionaries are to be additionally interpreted as having meanings consistent with those of related art documents and the contents of the present prompts, and must not be excessively interpreted as having ideal or very formulaic meanings unless defined.
In view of the deficiency of the prior art, the LTE antenna module, the radio frequency front-end module, the modulation and demodulation module, the BT/WLAN communication module and the power management and talkback function module which are arranged in the system realize the coverage of the LTE network on the basis platform of CAT1, thereby not only meeting the customer use requirement under the medium speed, but also having the BT/WLAN function.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in a variety of different forms and is not limited to the embodiments described herein.
Fig. 1 shows a schematic structural diagram of a CAT 1-based public network intercom system in an embodiment of the present invention.
The system comprises: the system comprises an LTE antenna module 11, a radio frequency front end module 12, a modulation and demodulation module 13, a BT/WLAN communication module 14 and a power management and talkback function module 15;
the radio frequency front end module 12 is connected to the LTE antenna module 11, the modem module 13 and the power management and intercom function module 15, and the BT/WLAN communication module 14 and the power management and intercom function module 15 are connected to the modem module 13;
the LTE antenna module 11 is configured to receive a radio frequency signal from the base station and send the radio frequency signal to the radio frequency front end module 12, and send the radio frequency signal from the radio frequency front end module 12 to the base station;
the radio frequency front end module 12 is configured to perform channel switching and filtering processing on the radio frequency signal received from the LTE antenna module 11 and send the radio frequency signal to the modem module 13, or perform channel switching and filtering processing on the radio frequency signal received from the modem module 13 and send the radio frequency signal to the LTE antenna module 11;
the modulation and demodulation module 13 is configured to demodulate the radio frequency signal from the radio frequency front end module 12 and the audio signal from the power management and intercom function module 15; the modem module 13 implements analog-to-digital conversion and digital-to-analog conversion of data.
The BT/WLAN communication module 14 is configured to transmit radio frequency signals passing through the modem module 13 through BT and/or WLAN;
the power management and intercom function module 15 is configured to perform power management and perform digital-to-analog conversion on the radio frequency signal from the modem module 13 or perform analog-to-digital conversion on the received audio signal, respectively.
It should be noted that, in this embodiment, it should be noted that the division of each module in the embodiment of fig. 1 is only a division of a logic function, and all or part of the actual implementation may be integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; part of the modules can be realized in a software calling mode through a processing element, and part of the modules can be realized in a hardware mode;
for example, the modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
In this embodiment, the LTE antenna module 11 is configured to receive a radio frequency signal from the base station as a downlink signal, and send a radio frequency signal from the radio frequency front end module 12 to the base station as an uplink signal; the working principle of the public network intercom system of CAT1 corresponding to the downlink signal is as follows: as shown in fig. 2a, the LTE antenna module 11 receives the uplink signal from the base station, transmits the uplink signal to the radio frequency front end module 12 for channel switching and filtering, and then reaches the modem module 13 for subsequent operations (which may be transmitted to the outside through the BT/WLAN communication module or to the power management and intercom module); the working principle of the public network intercom system of CAT1 corresponding to the uplink signal is as follows: as shown in fig. 2b, after the uplink signal (from the BT/WLAN communication module or the power management and intercom module) is modulated by the modem module 13, the uplink signal is subjected to channel switching and filtering operations by the rf front-end module 12, and finally is transmitted back to the base station through the space by the LTE antenna module 11.
Optionally, the power management and intercom function module may send the signal subjected to digital-to-analog conversion or analog-to-digital conversion to the modem module and/or the modem module.
Optionally, as shown in fig. 3, the radio frequency front end module includes: a radio frequency switch 31, a filtering unit 32, a radio frequency power amplifier 33 and a control switch 34.
The radio frequency switch 31 is connected to the filtering unit 32, and the filtering unit 32 is connected to the radio frequency power amplifier 33 and the control switch 34;
the radio frequency switch 31 is configured to perform channel switching on a radio frequency signal, the filtering unit 32 is configured to filter the radio frequency signal, the radio frequency power amplifier 33 is configured to amplify the radio frequency signal, and the control switch 34 is configured to control a switch of the radio frequency front end module.
It should be noted that the number of the radio frequency switch 31, the filtering unit 32, the radio frequency power amplifier 33, and the control switch 34 may be one or more, and fig. 3 in this embodiment is taken as an example, which is not limited thereto.
Optionally, the filtering unit 32 includes: duplexers and/or filters. Specifically, the duplexer/filter is selected as a filtering unit to perform filtering according to different frequency bands where the signals are located. For example, FDD (time division duplex mode) uses a duplexer, and TDD (frequency division duplex mode) uses a filter.
Optionally, as shown in fig. 4, the power management and intercom function module includes: a power management and audio codec unit 41; the modem module is used for respectively carrying out power supply management and carrying out digital-to-analog conversion on the radio frequency signals from the modem module or carrying out analog-to-digital conversion on the received audio signals. It should be noted that the received audio signal may be received from an external device or may be received by itself.
Optionally, the power management and audio codec unit 41 includes: a power management sub-unit 411 for performing power management, an audio codec sub-unit 412 for performing audio codec, and a user interface support function sub-unit 413. The power management and audio codec unit 41 integrates power management, audio codec, battery management, and user interface support functions in a unified manner.
Optionally, the power management and audio codec unit includes: one or more extensible interfaces.
Optionally, the power management and intercom function module further includes: the audio PA unit 42 and the playing unit 43 connected to the power management and audio codec unit 41, configured to amplify the digital-to-analog converted signal and play the amplified signal to the outside; and/or the audio collecting unit 44 connected to the power management and audio codec unit is configured to collect an audio signal and send the audio signal to the power management and audio codec unit 41, so as to perform analog-to-digital conversion on the audio signal.
The playing unit 43 may be a display playing unit or an audio playing unit; for example, a speaker, or an LCD. The audio acquisition unit 44 may be any device with audio signal acquisition, and preferably, an MIC interface is used in the intercom system.
Optionally, as shown in fig. 1, the modem module 13 includes: the modem integrated with radio frequency transceiver and blue tooth radio frequency can modulate the normal signal of blue tooth/WLAN.
Optionally, the modem module 13 further includes: one or more extensible interfaces.
Optionally, as shown in fig. 5, the BT/WLAN communication module includes: a BT/WLAN filter 51 and a BT/WLAN antenna 52 connected to said BT/WLAN filter 51.
The BT/WLAN filter 51 is configured to BT/WLAN filter the radio frequency signal from the modem module 13 for transmission to an external device through the BT/WLAN antenna 52. The BT/WLAN filter 51 is also used to filter signals received by the BT/WLAN antenna 52. It should be noted that the BT/WLAN filter and the BT/WLAN antenna are corresponding to each other, the antenna is a BT antenna if the filter is a BT filter, the antenna is a WLAN antenna if the filter is a WLAN filter, and the antenna may be a BT and WLAN dual-band antenna or a BT or WLAN single-frequency antenna if the BT/WLAN filter is a BT and WLAN dual-band antenna; similarly, if the BT/WLAN antenna is BT and WLAN dual band, the filter may be BT and WLAN dual band filter, or BT or WLAN single band filter.
Optionally, the public network intercom system further includes: and one or more of a SIM card module circuit, a USB module circuit and a PTT (push-to-talk) module circuit connected with the modem module.
For better explanation of the public network intercom system of CAT1 of the present invention, the following specific embodiments are described.
Example 1: a public network talkback PCBA system based on CAT 1; fig. 6 shows a system configuration diagram in the present embodiment.
The system comprises: an LTE antenna interface, a radio frequency front end (RF-FEM), an integrated modem (UIS8910DM), a power management + audio codec, an audio Power Amplifier (PA), a Bluetooth/WLAN filter (SAW), a BT/WLAN antenna, a Speaker interface, a MIC interface, and an LCD.
Wherein, LTE antenna interface connects the radio frequency front end, the radio frequency front end is connected integrated modem and power management + audio frequency codec, power management + audio frequency codec and Bluetooth WLAN wave filter are connected integrated modem, BT/WLAN antenna connection Bluetooth WLAN wave filter, audio Power Amplifier (PA) is connected power management + audio frequency codec and Speaker interface, MIC interface and LCD connect power management + audio frequency codec. The basic working principle of the system is as follows: the downlink signal is received from the space through the LTE antenna to the base station signal, firstly passes through the radio frequency front end, is switched and filtered through a channel, and then reaches the integrated modem. Similarly, the uplink signal is processed by the integrated modem, amplified by the radio frequency power amplifier in the radio frequency front end, filtered by the duplexer/filter with different frequency bands, and switched by the channel of the radio frequency switch, and finally transmitted back to the base station through the space by the LTE antenna. After the pairing protocol is successfully paired, signals from the integrated modem pass through the SAW, and then are transmitted to the main equipment through the space by the Bluetooth/WLAN antenna.
After the voice signal processed by power management and audio coding and decoding digital-to-analog conversion is amplified by an audio PA, the voice signal is sounded through a Speaker interface; and the audio signal picked up from the MIC interface is subjected to power management and audio coding and decoding to realize analog-to-digital conversion. The integrated modem integrates a radio frequency transceiver and a Bluetooth radio frequency and has a plurality of extensible interfaces. The power management + audio codec integrates power management, audio codec, battery management, and user interface support functions in a unified manner, and has an extensible interface.
As shown in fig. 7, a schematic structural diagram of the radio frequency front end includes: the radio frequency power amplifier comprises a radio frequency switch, a plurality of filtering units, a radio frequency power amplifier and two control switches. The radio frequency switch is connected with the filtering unit, and the filtering unit is connected with the radio frequency power amplifier and the control switch.
Experiments prove that signals of each frequency band and bandwidth of LTE do not influence the normal signal receiving of Bluetooth/WLAN, and when Bluetooth is turned on, the signals of each frequency band of LTE are not influenced.
To sum up, the utility model discloses a public network intercom system based on CAT1, through the LTE antenna module that sets up in the system, radio frequency front end module, modem module, BT/WLAN communication module and power management and the basic platform of talkbacking function module realization LTE network cover on CAT1, not only satisfy the customer operation requirement under the medium rate, still possess BT/WLAN function simultaneously, this public network intercom system can be under the condition of not upgrading basic station hardware environment, insert the LTE network and realize the function of talkbacking, can break through the distance restriction of traditional intercom, the occasion restriction, the frequency restriction, and have lower development cost and solve the problem among the prior art. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A CAT 1-based public network intercom system, comprising: the system comprises an LTE antenna module, a radio frequency front end module, a modulation and demodulation module, a BT/WLAN communication module and a power management and talkback function module;
the radio frequency front end module is connected with the LTE antenna module, the modulation and demodulation module and the power management and talkback function module, and the BT/WLAN communication module and the power management and talkback function module are connected with the modulation and demodulation module; the LTE antenna module is used for receiving radio frequency signals from a base station and sending the radio frequency signals from the radio frequency front-end module; the radio frequency front end module is used for carrying out channel switching and filtering processing on the received radio frequency signals; the modulation and demodulation module is used for demodulating the radio frequency signal from the radio frequency front end module and the audio signal from the power management and talkback function module; the BT/WLAN communication module is used for transmitting radio frequency signals passing through the modulation and demodulation module through BT and/or WLAN; and the power management and talkback function module is used for respectively carrying out power management and carrying out digital-to-analog conversion on the radio frequency signal from the modulation and demodulation module or carrying out analog-to-digital conversion on the received audio signal.
2. The CAT 1-based public network intercom system according to claim 1, wherein the radio frequency front end module comprises: the radio frequency power amplifier comprises a radio frequency switch, a filtering unit, a radio frequency power amplifier and a control switch.
3. The CAT 1-based public network intercom system according to claim 2, wherein the filtering unit comprises: duplexers and/or filters.
4. The CAT 1-based public network intercom system according to claim 1, wherein the power management and intercom function module comprises: and the power management and audio coding and decoding unit is used for respectively carrying out power management and carrying out digital-to-analog conversion on the radio frequency signal from the modulation and demodulation module or carrying out analog-to-digital conversion on the received audio signal.
5. The CAT 1-based public network intercom system according to claim 1, wherein the power management and intercom function module further comprises:
the audio PA unit and the playing unit are connected with the power management and audio coding and decoding unit and are used for amplifying and playing the signals subjected to digital-to-analog conversion;
and/or the presence of a gas in the gas,
and the audio acquisition unit is connected with the power management and audio coding and decoding unit and is used for acquiring audio signals and sending the audio signals to the power management and audio coding and decoding unit so as to perform analog-to-digital conversion on the audio signals.
6. The CAT 1-based public network intercom system according to claim 1, wherein the modem module comprises: a modem integrated with a radio frequency transceiver and a bluetooth radio frequency.
7. The CAT 1-based public network intercom system according to claim 1, wherein the power management and audio codec unit comprises: the system comprises a power management subunit, an audio coding and decoding subunit and a user interface support function subunit.
8. The CAT 1-based public network intercom system according to claim 5 or 6, wherein the modem module and/or the power management and audio codec unit comprises: one or more extensible interfaces.
9. The CAT 1-based public network intercom system according to claim 1, wherein the BT/WLAN communication module comprises: a BT/WLAN filter and a BT/WLAN antenna connected to the BT/WLAN filter.
10. The CAT 1-based public network intercom system according to claim 1, further comprising: and the modulation and demodulation module is connected with one or more of a SIM card module circuit, a USB module circuit and a PTT module circuit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449371A (en) * | 2022-02-16 | 2022-05-06 | 上海数果科技有限公司 | OMA intercom system based on Cat1 |
| CN114759938A (en) * | 2022-06-15 | 2022-07-15 | 易联科技(深圳)有限公司 | Audio delay processing method and system for public network talkback equipment |
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2021
- 2021-02-25 CN CN202120420942.0U patent/CN214338068U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449371A (en) * | 2022-02-16 | 2022-05-06 | 上海数果科技有限公司 | OMA intercom system based on Cat1 |
| CN114759938A (en) * | 2022-06-15 | 2022-07-15 | 易联科技(深圳)有限公司 | Audio delay processing method and system for public network talkback equipment |
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