Audio signal and low-speed switch quantity simultaneous transmission device and network audio and video monitoring system

Abstract

The present invention provides an audio signal and low-speed switch quantity simultaneous transmission device and a network audio and video monitoring system. The device comprises: a switch quantity / voltage converter, which is arranged at a transmitting end, receives a switch quantity and generates a switch quantity bias voltage signal of a corresponding level according to the switch quantity; a voltage / current converter, which receives the switch quantity bias voltage signal and an audio signal output by an AGC amplifier, and converts the switch quantity bias voltage signal and the audio signal into a current signal after superimposing them; a current / voltage converter, which is used to receive the current signal and convert the current signal into a voltage signal; a switch quantity decoding delay output module, which analyzes the switch quantity corresponding to the switch quantity bias voltage signal according to the voltage signal; when the state of the switch quantity changes, the switch quantity bias voltage signal slowly changes to the corresponding level, so as to realize the transmission of other low-speed switch quantity signals such as automatic alarm for disconnection of connecting line, manual alarm, smoke alarm, etc.

Description

Technical Field

[0001] The present invention relates to the field of monitoring technology, and in particular to a simultaneous transmission device for audio signals and low-speed switching quantities and a network audio and video monitoring system. Background Art

[0002] With the development of science and technology, various service window counters (banks, telecommunications business halls, government halls, airports, supermarkets, hotels, etc.) often need or have installed network audio and video surveillance cameras and microphones connected to them for collecting the voice of people's conversations. The network audio and video surveillance camera is used to collect image signals, and the microphone is used to synchronously pick up audio signals and send the picked up audio signals to the surveillance camera. The surveillance camera synthesizes the image signal it collects and the audio signal it receives into a surveillance video data stream. The surveillance camera is connected to a network switch and / or a network video recorder (also known as a network hard disk video recorder) to send the surveillance video data stream to the network switch and / or the network video recorder.

[0003] The best installation location for the microphone is usually on the countertop, desktop, or middle partition glass near the window counter. The audio signal can only be transmitted to the surveillance camera through the line. However, in actual application scenarios, in addition to transmitting audio signals, users also need to transmit some switching quantities, such as manual alarm and smoke alarm signals. At this time, separate wiring is required to transmit the switching quantities, which increases the construction cost. In addition, wiring is difficult for special occasions such as bank business halls. Summary of the invention

[0004] In order to at least partially solve the above technical problems in the prior art, the present invention provides an audio signal and low-speed switch quantity simultaneous transmission device and a network audio and video monitoring system, which can at least partially solve the problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, a device for simultaneously transmitting an audio signal and a low-speed switching value is provided, comprising:

[0007] A switch quantity / voltage converter, arranged at the transmitting end, receives the switch quantity and generates a switch quantity bias voltage signal of a corresponding level according to the switch quantity;

[0008] A voltage / current converter, arranged at the transmitting end, connected to the switch quantity / voltage converter and the pickup, for receiving the switch quantity bias voltage signal and the audio signal output by the AGC amplifier, and converting the switch quantity bias voltage signal and the audio signal into a current signal;

[0009] A current / voltage converter, arranged at the receiving end and connected to the voltage / current converter, for receiving the current signal and converting the current signal into a voltage signal;

[0010] A switch quantity decoding delay output module is arranged at the receiving end, connected to the current / voltage converter, and analyzes the switch quantity corresponding to the switch quantity bias voltage signal according to the voltage signal;

[0011] When the state of the switch value changes, the switch value bias voltage signal changes slowly to a corresponding level.

[0012] Further, the switch quantity / voltage converter includes: a multiple-choice logic;

[0013] The input pin of the multiple-choice logic is used to receive the switching value, multiple control pins are grounded through resistors with different resistance values, the output pin is connected to the power supply through a pull-up resistor, and is grounded through a capacitor and connected to the input end of the switching value / voltage converter.

[0014] Furthermore, the multiple-choice logic 2 N Select 1 logic circuit, (N is the number of input switches), such as a 4-to-1 chip.

[0015] Furthermore, the switch quantity decoding delay output module includes: a voltage-to-switch quantity logic circuit and a duration timer;

[0016] The first input end of the voltage-to-switch logic circuit is connected to the current / voltage converter for receiving the voltage signal, the second input end receives a reference voltage, and the output end is connected to the duration timer, which is used to output the switch quantity. The switch quantity output will only be output after reaching the specified duration to prevent the wrong switch quantity state from being output.

[0017] Furthermore, the switch quantity decoding delay output module includes: ADC and a single chip microcomputer.

[0018] The input end of the ADC is connected to the current / voltage converter, which is used to receive the voltage signal, sample the voltage signal and output it to the single-chip microcomputer. The single-chip microcomputer completes the switch quantity state decoding and duration timer function, and outputs the corresponding switch quantity.

[0019] Furthermore, the switch quantity decoding delay output module includes: an ADC and a duration timer;

[0020] The input end of the ADC is connected to the current / voltage converter for receiving the voltage signal and sampling the voltage signal, and the output end is connected to the duration timer, and the duration timer is used to output the switching value.

[0021] Furthermore, the audio signal and low-speed switching quantity simultaneous transmission device further comprises: an AGC amplifier;

[0022] The AGC amplifier is connected between the pickup and the voltage / current converter.

[0023] Furthermore, the audio signal and low-speed switch quantity simultaneous transmission device further comprises: an output interface;

[0024] The output interface includes: a diode bridge and an RJ45 connector;

[0025] One end of the diode bridge is connected to the voltage / current converter, and the other end is connected to the RJ45 connector. The RJ45 connector is connected to the current / voltage converter via a network cable.

[0026] Furthermore, the audio signal and low-speed switching quantity simultaneous transmission device further comprises: a switching quantity input interface;

[0027] The switch quantity input interface includes: a switch quantity conventional interface and a switch quantity RJ45 interface, the switch quantity RJ45 interface is connected to the RJ45 connector, and the switch quantity conventional interface is grounded through a control switch.

[0028] Furthermore, the audio signal and low-speed switch quantity simultaneous transmission device further comprises: a transmission interface;

[0029] The transmission interface is connected to the front end of the current / voltage converter.

[0030] Furthermore, the audio signal and low-speed switch quantity simultaneous transmission device further comprises: an audio noise reduction module and an audio isolation output module;

[0031] The input end of the audio noise reduction module is connected to the output end of the current / voltage converter, the output end is connected to the input end of the audio isolation output module, and the output end of the audio isolation output module is connected to an external device.

[0032] Furthermore, the switch quantity represents an automatic alarm for disconnection of the connecting line, a manual alarm and / or a smoke alarm.

[0033] In a second aspect, a network audio and video monitoring system is provided, comprising: a monitoring camera for collecting images, a microphone for picking up audio signals, and a simultaneous transmission device for audio signals and low-speed switching quantities as described above.

[0034] The audio signal and low-speed switch quantity simultaneous transmission device and network audio and video monitoring system provided by the present invention include: a switch quantity / voltage converter, arranged at the transmitting end, receiving the switch quantity and generating a switch quantity bias voltage signal of a corresponding level according to the switch quantity; a voltage / current converter, arranged at the transmitting end, connected to the switch quantity / voltage converter and the pickup, used to receive the switch quantity bias voltage signal and the audio signal output by the AGC amplifier, and convert the switch quantity bias voltage signal and the audio signal into a current signal; a current / voltage converter, arranged at the receiving end, connected to the voltage / current converter, used to receive the current signal and convert the current signal into a voltage signal; a switch quantity decoding delay output module, arranged at the receiving end, connected to the current / voltage converter, parsing the switch quantity corresponding to the switch quantity bias voltage signal according to the voltage signal; wherein, when the state of the switch quantity changes, the switch quantity bias voltage signal slowly changes to the corresponding level. By adopting the above technical scheme, the switch quantity bias voltage signal is planned, controlled, and detected, and the transmission of other low-speed switch quantity signals such as automatic alarm for disconnection of the connecting line, manual alarm, and smoke alarm is realized.

[0035] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0037] Figure 1 is a structural block diagram of a device for simultaneously transmitting an audio signal and a low-speed switching value in an embodiment of the present invention;

[0038] Figure 2 is a structural block diagram of a switch quantity / voltage converter in an embodiment of the present invention;

[0039] Figure 3 The structure frame of the switch quantity decoding delay output module in the embodiment of the present invention is Figure 1 ;

[0040] Figure 4 The structure frame of the switch quantity decoding delay output module in the embodiment of the present invention is Figure 2 ;

[0041] Figure 5The structure frame of the switch quantity decoding delay output module in the embodiment of the present invention is Figure 3 ;

[0042] Figure 6 The structure frame of the switch quantity decoding delay output module in the embodiment of the present invention is Figure 4 ;

[0043] Figure 7 The structure frame of the switch quantity decoding delay output module in the embodiment of the present invention is Figure 5 . DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0045] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the contents, claims and drawings disclosed in this specification, any person skilled in the art can easily understand the relevant purposes and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any viewpoint.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] Figure 1 FIG. 4 is a structural block diagram of an audio signal and low-speed switch quantity simultaneous transmission device in an embodiment of the present invention; Figure 1 As shown, the audio signal and low-speed switching quantity simultaneous transmission device may include: a switching quantity / voltage converter, a voltage / current converter, a current / voltage converter, and a switching quantity decoding delay output module.

[0048] The switch quantity / voltage converter is arranged at the transmitting end, receives the switch quantity and generates a switch quantity bias voltage signal of a corresponding level according to the switch quantity;

[0049] The voltage / current converter is arranged at the transmitting end, connected to the switch quantity / voltage converter and the pickup, and is used to receive the switch quantity bias voltage signal and the audio signal output by the AGC amplifier, and convert the switch quantity bias voltage signal and the audio signal into a current signal after superposition;

[0050] The current / voltage converter is arranged at the receiving end, connected to the voltage / current converter, and is used to receive the current signal and convert the current signal into a voltage signal;

[0051] The switch quantity decoding delay output module is arranged at the receiving end, connected to the current / voltage converter, and analyzes the switch quantity corresponding to the switch quantity bias voltage signal according to the voltage signal;

[0052] When the state of the switch value changes, the switch value bias voltage signal changes slowly to a corresponding level.

[0053] By adopting the above technical solution, the switch bias voltage signal is planned, controlled and detected to realize the transmission of other low-speed switch signals such as automatic alarm for disconnection of connecting wires, manual alarm, smoke alarm, etc.

[0054] In an optional embodiment, the audio signal and low-speed switching quantity simultaneous transmission device also includes: an AGC amplifier; the AGC amplifier is connected between the pickup and the voltage / current converter, and is used to amplify the collected audio signal and send it to the voltage / current converter.

[0055] In an optional embodiment, the audio signal and low-speed switching quantity simultaneous transmission device also includes: an output interface; the output interface includes: a diode bridge and an RJ45 connector; one end of the diode bridge is connected to the voltage / current converter, and the other end is connected to the RJ45 connector, and the RJ45 connector is connected to the current / voltage converter via a network cable.

[0056] The diode bridge is used to be compatible with a 1-core or 2-core cable that is connected to the remote interface in either a forward or reverse connection.

[0057] The diode bridge is used to ensure that the 2-core cable of the remote interface can work normally in the forward or reverse connection.

[0058] The output interface is connected to the receiving end through a 2-core cable, and the current signal is sent out through one of the core cables, and the other core cable is used as a power line;

[0059] In an optional embodiment, the audio signal and low-speed switching quantity simultaneous transmission device further comprises: a switching quantity input interface;

[0060] The switch quantity input interface includes: a switch quantity conventional interface and a switch quantity RJ45 interface, the switch quantity RJ45 interface is connected to the RJ45 connector, and the switch quantity conventional interface is grounded through a control switch.

[0061] In an optional embodiment, the audio signal and low-speed switch quantity simultaneous transmission device further comprises: a transmission interface;

[0062] The transmission interface is connected to the front end of the current / voltage converter.

[0063] In an optional embodiment, the audio signal and low-speed switch quantity simultaneous transmission device further includes: an audio noise reduction module and an audio isolation output module;

[0064] The input end of the audio noise reduction module is connected to the output end of the current / voltage converter, the output end is connected to the input end of the audio isolation output module, and the output end of the audio isolation output module is connected to an external device.

[0065] Among them, the audio noise reduction module further includes an amplifier and an audio processing unit (in some embodiments, a high-pass filter can be used to implement it). The amplifier amplifies the converted voltage signal, and the audio processing unit filters out the noise in the amplified voltage signal. When a high-pass filter is used for implementation, low-frequency noise in the voltage signal can be filtered out.

[0066] In an optional embodiment, the switch quantity represents an automatic alarm for disconnection of the connecting line, a manual alarm and / or a smoke alarm.

[0067] It is worth noting that in the audio signal transmission process of the network audio and video monitoring system, in actual application scenarios, users need to transmit not only audio signals but also some switching quantities such as manual alarm and smoke alarm signals. The current for transmitting audio signals is I A =I O +I Δ , where I Δ It is the alternating current used to transmit audio signals, I O Contains the bias current for power supply and signal transmission, I O It can be stable or change slowly. After a lot of research and experiments, the applicant believes that planning, control and detection O , the transmission of audio signals uses the AC component, and the transmission of switch quantity uses the DC component, which can realize the transmission of other low-speed switch quantity signals such as transmission line break alarm, manual alarm, smoke alarm, etc., and will not cause damage to the audio that can be perceived by the human ear. For example, I O The planning table can be shown as Table 1:

[0068] Table 1

[0069]

[0070] The switch quantity / voltage converter is used to control the slow change of the switch quantity to Io. Corresponding to different switch quantity states, when the switch quantity state changes, Io changes to the corresponding current value. This current change should be slow and completed within a time T to avoid causing obvious changes in the sound signal to be perceived by the human ear.

[0071] In an optional embodiment, the switch quantity / voltage converter includes: a multiple-choice logic; the input pin of the multiple-choice logic is used to receive the switch quantity, multiple control pins are grounded through resistors with different resistance values, the output pin is connected to the power supply through a pull-up resistor, and is grounded through a capacitor, and is connected to the input end of the switch quantity / voltage converter.

[0072] For example, see Figure 2 , the multiple-choice logic is a 4-choice-1 chip with two input terminals for receiving two switching quantities, one of which, K1, is connected through two contacts such as 45 of the RJ45 crystal plug that transmits the audio signal, and the other, K2, is connected through a key switch or connector on the pickup circuit board. The switching quantities K1 and K2 are connected through a 4-choice-1 circuit chip, and one of R2-R5 is connected to the resistor R1 to form a voltage divider circuit. R2-R5 uses different resistance values. Four different voltages are formed with R1, which are connected to the voltage-current conversion circuit to form different Io, corresponding to different state combinations of K1 and K2. The function of capacitor C1 is that when the R2-R5 resistors are switched, the voltage changes slowly, so that the change of Io is also slow, and the transmitted audio signal will not produce noise that can be perceived by the human ear.

[0073] In an optional embodiment, the 4-to-1 chip may be a 74LS153 chip or a LA7954 chip.

[0074] It is worth mentioning that the switch quantity can be connected through a conventional interface, or it can share a network cable with the audio signal. In this way, the product does not need to make any changes between the appearance and the original product. The microphone is usually placed in a more obvious position such as a desktop, and the switch quantity and audio signal share a network cable to make the product appearance more beautiful.

[0075] In addition, after completing the current-to-voltage conversion, the receiving end detects the voltage signal corresponding to the current through hardware and generates a corresponding switch value or alarm output.

[0076] In an optional embodiment, the switch quantity decoding delay output module includes: a voltage-to-switch quantity logic circuit and a duration timer;

[0077] The first input end of the voltage-to-switch logic circuit is connected to the current / voltage converter for receiving the voltage signal, the second input end receives a reference voltage, and the output end is connected to the duration timer, which is used to output the switch value.

[0078] When there is only one switching value to be transmitted, a voltage-to-switch logic circuit can be used to directly form the corresponding switching value output, see Figure 3Or add a voltage-to-switch logic circuit to detect the state of Io=0, which indicates that the 2-core wire connecting the transmitter and receiver of the pickup is broken, and can be used as a disconnection alarm switch output, see Figure 4 .

[0079] It is worth noting that the voltage-to-switch logic circuit can be a comparator.

[0080] When there are only two switching values ​​to be transmitted, four voltage-to-switch logic circuits are used to form four voltage output signals. The gate circuit or programmable logic circuit is used to finally obtain two switching outputs corresponding to K1 and K2. Figure 5 While generating these switch quantities, the current can also be detected as 0. Or a voltage-to-switch logic circuit can be added to detect the state of Io=0, which indicates that the 2-core wire connecting the transmitter and receiver of the pickup is broken. It can be used as a disconnection alarm switch output, see Figure 6 .

[0081] In an optional embodiment, the switch quantity decoding delay output module includes: an ADC and a single chip microcomputer.

[0082] The input end of the ADC is connected to the current / voltage converter, which is used to receive the voltage signal, sample the voltage signal and output it to the single-chip microcomputer. The single-chip microcomputer completes the switch quantity state decoding and duration timer function, and outputs the corresponding switch quantity.

[0083] In another optional embodiment, the switch quantity decoding delay output module includes: an ADC and a duration timer; the input end of the ADC is connected to the current / voltage converter for receiving the voltage signal and sampling the voltage signal, and the output end is connected to the duration timer, and the duration timer is used to output the switch quantity.

[0084] Specifically, when the number of transmitted switch values ​​is 2 or more, a processor can be used to detect the corresponding switch value state through ADC sampling and output, see Figure 7 When the state of Io=0 is detected, this state indicates that the 2-core wire connecting the transmitter and receiver of the pickup is broken. It can be used as a disconnection alarm switch output.

[0085] For the above-mentioned switch quantity detection methods, the switch quantity or alarm output should include a ≥2T delay output. Only when a new switch quantity output lasts for more than 2T, the new switch quantity will be output to avoid switch quantity status output errors. Therefore, a delay output is achieved by setting a duration timer at the output end of the comparator or microcontroller.

[0086] In an optional embodiment, the simultaneous interpretation device may further include: a power supply for supplying power to each module.

[0087] It is worth noting that when there is only one switch quantity, the comparator can be used for direct output. When there are multiple switch quantities, multiple comparators must be output to a logic circuit to decode the switch quantity state. The switch quantities output by the decoding logic of 4 comparators are 2.

[0088] The embodiment of the present invention further provides a network audio and video monitoring system, comprising: a monitoring camera for collecting images, a microphone for picking up audio signals, and the above-mentioned audio signal and low-speed switch quantity simultaneous transmission device.

[0089] The sound pickup may be a microphone.

[0090] By adopting the above system, simultaneous transmission of switch quantity and audio signal can be achieved, saving wiring cost.

[0091] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0092] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0093] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0094] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A device for simultaneously transmitting audio signals and low-speed switching quantities, characterized in that: include: A switch quantity / voltage converter, arranged at the transmitting end, receives the switch quantity and generates a switch quantity bias voltage signal of a corresponding level according to the switch quantity; A voltage / current converter, arranged at the transmitting end, connected to the switch quantity / voltage converter and the pickup, for receiving the switch quantity bias voltage signal and the audio signal output by the AGC amplifier, and converting the switch quantity bias voltage signal and the audio signal into a current signal after superposition; A current / voltage converter, arranged at the receiving end and connected to the voltage / current converter, for receiving the current signal and converting the current signal into a voltage signal; A switch quantity decoding delay output module is arranged at the receiving end, connected to the current / voltage converter, and analyzes the switch quantity corresponding to the switch quantity bias voltage signal according to the voltage signal; Wherein, when the state of the switch quantity changes, the switch quantity bias voltage signal changes slowly to a corresponding level; Wherein, the audio signal and low-speed switching quantity simultaneous transmission device also includes the AGC amplifier; the AGC amplifier is connected between the pickup and the voltage / current converter.

2. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 1 is characterized in that: The switch quantity / voltage converter includes: a multiple-choice logic; The input pin of the multiple-choice logic is used to receive the switching value, multiple control pins are grounded through resistors with different resistance values, the output pin is connected to the power supply through a pull-up resistor, and is grounded through a capacitor and connected to the input end of the switching value / voltage converter.

3. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 2 is characterized in that: The multiple-choice logic is 2 N Select 1 logic circuit, N is the number of input switches.

4. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 1, characterized in that: The switch quantity decoding delay output module includes: a voltage-to-switch quantity logic circuit and a duration timer; The first input end of the voltage-to-switch logic circuit is connected to the current / voltage converter for receiving the voltage signal, the second input end receives a reference voltage, and the output end is connected to the duration timer, which is used to output the switch value.

5. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 1, characterized in that: The switch quantity decoding delay output module includes: ADC and single chip microcomputer; The input end of the ADC is connected to the current / voltage converter, which is used to receive the voltage signal, sample the voltage signal and output it to the single-chip microcomputer. The single-chip microcomputer completes the switch quantity state decoding and duration timer function, and outputs the corresponding switch quantity.

6. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 1, characterized in that: Also includes: Output interface; The output interface includes: a diode bridge and an RJ45 connector; One end of the diode bridge is connected to the voltage / current converter, and the other end is connected to the RJ45 connector. The RJ45 connector is connected to the current / voltage converter via a network cable.

7. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 6, characterized in that: Also includes: Switch input interface; The switch quantity input interface includes: a switch quantity conventional interface and a switch quantity RJ45 interface, the switch quantity RJ45 interface is connected to the RJ45 connector, and the switch quantity conventional interface is grounded through a control switch.

8. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 6, characterized in that: Also includes: Transmission interface; The transmission interface is connected to the front end of the current / voltage converter.

9. The audio signal and low-speed switching quantity simultaneous transmission device according to claim 1, characterized in that: It also includes: an audio noise reduction module and an audio isolation output module; The input end of the audio noise reduction module is connected to the output end of the current / voltage converter, the output end is connected to the input end of the audio isolation output module, and the output end of the audio isolation output module is connected to an external device.

10. The audio signal and low-speed switching value simultaneous transmission device according to any one of claims 1 to 9, characterized in that: The switch quantity represents an automatic alarm for disconnection of the connecting line, a manual alarm and / or a smoke alarm.

11. A network audio and video monitoring system, characterized in that: include: A monitoring camera for collecting images, a microphone for picking up audio signals, and a device for simultaneously transmitting audio signals and low-speed switching quantities as claimed in any one of claims 1 to 10.

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