CN219420780U

CN219420780U - Digital conference host and digital conference system

Info

Publication number: CN219420780U
Application number: CN202320941473.6U
Authority: CN
Inventors: 王恒; 郭远林; 李春华
Original assignee: Guangzhou DSPPA Audio Co Ltd
Current assignee: Guangzhou DSPPA Audio Co Ltd
Priority date: 2023-04-23
Filing date: 2023-04-23
Publication date: 2023-07-25
Anticipated expiration: 2033-04-23

Abstract

The application provides a digital conference host computer and digital conference system, this digital conference host computer includes: the audio conversion module is used for receiving the original digital audio signal and converting the original digital audio signal into an analog audio signal to be played; the audio output control module is connected with the audio conversion module and is used for being respectively connected with the audio playing device and the host power supply, and is used for conducting the connection between the audio conversion module and the audio playing device when receiving the conducting control signal and disconnecting the connection between the audio conversion module and the audio playing device when receiving the switching-off control signal or detecting that the host power supply is powered off; the host control module is connected with the audio output control module and is used for outputting a turn-off control signal to the audio output control module when the continuous power-on time length is smaller than a preset time length threshold value and outputting a turn-on control signal to the audio output control module when the continuous power-on time length is larger than or equal to the time length threshold value. The cost can be reduced.

Description

Digital conference host and digital conference system

Technical Field

The application relates to the technical field of conference equipment, in particular to a digital conference host and a digital conference system.

Background

With the development of communication technology, a conference is currently held by a digital conference system so as to break through space limitation. The existing digital conference system consists of a digital conference host, an audio input device, an external sound source device, a POE switch, a camera device, a display device, an audio processor, a sound console, a power amplifier, an audio playing device, a time sequence power supply and other devices. When the digital conference system is powered on, the time sequence power supply supplies power to other devices in the system according to a preset power supply sequence, so that the audio playing device is prevented from emitting impact sounds, and the audio playing device is further protected. However, providing a time-series power supply in a digital conference system increases the system cost, and there is a problem in that the cost is too high.

Disclosure of Invention

The object of the present application is to solve at least one of the above-mentioned technical drawbacks, in particular the technical drawbacks of the prior art which are too costly.

In a first aspect, an embodiment of the present application provides a digital conference host, including:

the audio conversion module is used for receiving an original digital audio signal and converting the original digital audio signal into an analog audio signal to be played;

the audio output control module is connected with the audio conversion module and is used for being respectively connected with the audio playing equipment and a host power supply; the audio output control module is used for conducting connection between the audio conversion module and the audio playing device when receiving a conduction control signal, and disconnecting the connection between the audio conversion module and the audio playing device when receiving a disconnection control signal or detecting that the power supply of the host is powered off;

The host control module is connected with the audio output control module and is used for outputting the turn-off control signal to the audio output control module under the condition that the continuous power-on time length is smaller than a preset time length threshold value and outputting the turn-on control signal to the audio output control module under the condition that the continuous power-on time length is larger than or equal to the time length threshold value.

In one embodiment, the audio output control module includes:

the relay circuit comprises a relay and a first switch unit, wherein a first end of the first switch unit is used for being grounded, a second end of the first switch unit is connected with a coil of the relay, the coil of the relay is also used for being connected with a relay driving power supply, a first normally open contact of the relay is connected with the audio conversion module, and a second normally open contact of the relay is used for being connected with the audio playing equipment;

the first end of the relay control circuit is connected with the third end of the first switch unit, the second end of the relay control circuit is connected with the host control module, and the third end of the relay control circuit is used for being connected with the host power supply;

The relay control circuit is used for conducting connection between the first end of the first switch unit and the second end of the first switch unit when receiving the conduction control signal, and disconnecting connection between the first end of the first switch unit and the second end of the first switch unit when receiving the turn-off control signal or detecting that the power supply of the host is powered off.

In one embodiment, the relay control circuit includes:

the first end of the second switch unit is used for being grounded, the second end of the second switch unit is connected with the third end of the first switch unit, and the third end of the second switch unit is connected with the host control module; wherein the second switch unit is configured to disconnect a connection between a first end of the second switch unit and a second end of the second switch unit when the on control signal is received, and to connect the first end of the second switch unit and the second end of the second switch unit when the off control signal is received, so as to disconnect the first switch unit;

the first end of the third switch unit is used for being grounded, the second end of the third switch unit is connected with the third end of the first switch unit, the third end of the third switch unit is used for being connected with the relay driving power supply, and the fourth end of the third switch unit is used for being connected with the host power supply; the third switch unit is used for disconnecting the first end of the third switch unit from the second end of the third switch unit when the host power supply is powered on, so that the voltage of the second end of the third switch unit is the voltage of the relay driving power supply; the third switch unit is further used for conducting connection between the first end of the third switch unit and the second end of the third switch unit when the power supply of the host is detected to be powered off, so that the first switch unit is disconnected.

In one embodiment, the audio conversion module includes:

the network communication circuit is used for being connected with a switch and receiving the original digital audio signal output by the switch;

the audio encoding and decoding circuit is connected with the network communication circuit and used for decoding the original digital audio signal to obtain an original analog audio signal;

the audio input control circuit is used for being connected with the audio input equipment and used for amplifying the input analog audio signal to obtain an amplified analog audio signal;

and the volume control circuit is respectively connected with the audio encoding and decoding circuit, the audio input control circuit and the audio output control module and is used for adjusting the volume of the original analog audio signal and/or the amplified analog audio signal so as to obtain the analog audio signal to be played.

In one embodiment, the audio input control circuit includes:

the first amplifying unit is used for being connected with the AUX audio input device, amplifying the input AUX audio signal and outputting the amplified AUX audio signal;

the second amplifying unit is used for being connected with the alarm audio input device, amplifying the input alarm audio signal and outputting the amplified alarm audio signal;

The first end of the fourth switch unit is used for being grounded, the second end of the fourth switch unit is connected with the first amplifying unit, and the third end of the fourth switch unit is connected with the second amplifying unit;

the third amplifying unit is respectively connected with the volume control circuit, the second amplifying unit and the fourth end of the fourth switch unit and is used for amplifying the received target audio to obtain the amplified analog audio signal;

the fourth switch unit is used for conducting connection between the first end of the fourth switch unit and the second end of the fourth switch unit when the amplified alarm audio signal is received; and the third amplifying unit is further used for disconnecting the connection between the first end of the four switching units and the second end of the fourth switching unit when the amplified alarm audio signal is not received, so that the third amplifying unit receives the amplified AUX audio signal.

In one embodiment, the network communication circuit comprises an ethernet switch chip, and the audio codec circuit comprises a first PHY chip, a first microcontroller, and a first digital-to-analog conversion unit;

The Ethernet switch chip is used for being connected with the switch, the first PHY chip is respectively connected with the Ethernet switch chip and the first microcontroller, the first microcontroller is connected with the first digital-to-analog conversion unit, and the first digital-to-analog conversion unit is connected with the volume control circuit.

In one embodiment, the volume control circuit comprises a digital signal processor, a first analog-to-digital conversion unit and a second digital-to-analog conversion unit;

the digital signal processor is respectively connected with the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, the first analog-to-digital conversion unit is respectively connected with the audio encoding and decoding circuit and the audio input control circuit, and the second digital-to-analog conversion unit is connected with the audio output control module;

the digital signal processor is used for detecting the actual volume value of the original analog audio signal and/or the amplified analog audio signal, and adjusting the volume of the original analog audio signal and/or the amplified analog audio signal when the actual volume value is greater than a preset volume threshold value so as to obtain the analog audio signal to be played, wherein the actual volume value of the analog audio signal is smaller than or equal to the volume threshold value.

In one embodiment, the network communication circuit comprises an ethernet switch chip, and the host control module comprises a second microcontroller, a second PHY chip, and a touch display device;

the second microcontroller is respectively connected with the audio output control module, the second PHY chip and the touch display device, and the second PHY chip is connected with the Ethernet switch chip.

In one embodiment, the digital conference host further includes a video matrix switching module, the video matrix switching module includes a 4k video processor chip, and the 4k video processor chip is connected to the host control module and is used for connecting to a video playing device.

In a second aspect, embodiments of the present application provide a digital conference system, including:

at least one pickup, each pickup for collecting a conference audio signal and generating an original digital audio signal from the conference audio signal;

a switch connected to each of the microphones;

the digital conference host as in any one of the above embodiments, wherein an audio conversion module of the digital conference host is connected to the switch.

In the digital conference host and the digital conference system, the host control module is connected with the audio output control module, and the audio output control module can selectively connect or disconnect the connection between the audio conversion module and the audio playing device. When the continuous power-on time length is smaller than a preset time length threshold value, the host control module outputs a turn-off control signal to the audio output control module so as to disconnect the audio conversion module from the audio playing device. When the continuous power-on duration is greater than or equal to a preset duration threshold or detected, the host control module outputs a conduction control signal to the audio output control module so as to conduct connection between the audio conversion module and the audio playing device. Therefore, even if all modules of the digital conference host are powered on at the same time, the host control module can delay to conduct the connection between the audio conversion module and the audio playing device so as to avoid the impact sound caused by starting. Meanwhile, the audio output control module can also disconnect the connection between the audio conversion module and the audio playing device in time when detecting that the power supply of the host is powered off, so that impact sound caused by power off can be avoided. Therefore, by adopting the scheme of the application, the impact sound can be avoided under the condition that the time sequence power supply is not arranged, so that the equipment cost of the digital conference host can be reduced, and the system cost is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic block diagram of a digital conference host in one embodiment;

FIG. 2 is a schematic block diagram of an audio output control module in one embodiment;

FIG. 3 is a schematic block diagram of an audio conversion module in one embodiment;

FIG. 4 is a schematic block diagram of audio input control circuitry in one embodiment;

FIG. 5 is a schematic block diagram of network communication circuitry and audio codec circuitry in one embodiment;

FIG. 6 is a schematic block diagram of a volume control circuit in one embodiment;

FIG. 7 is a schematic block diagram of a host control module in one embodiment;

fig. 8 is a schematic block diagram of a digital conference system in one embodiment.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In one embodiment, the present application provides a digital conference host. As shown in fig. 1, the digital conference host may include an audio conversion module 100, an audio output control module 200, and a host control module 300. The audio conversion module 100 refers to a circuit structure or device capable of converting a digital audio signal into an analog audio signal, and the analog audio signal output from the audio conversion module 100 may be used to drive the audio playback device 400 to play audio. The audio output control module 200 refers to a circuit structure or device capable of selectively turning on or off the connection between the audio conversion module 100 and the audio playback apparatus 400. Host control module 300 refers to a circuit structure or device for controlling the operation of the various modules, circuits, and units of a digital conference host.

Specifically, since the digital conference system realizes signal transmission by means of digital signals, that is, the remote audio signal received by the digital conference host is a digital signal, and the audio playing device 400 needs to perform audio playing based on the analog signal, the digital conference host can convert the received original digital audio signal into an analog audio signal to be played through the audio conversion device, so that the audio playing device 400 can play audio based on the analog audio signal to be played.

As shown in fig. 1, the host control module 300 is connected to the audio output control module 200, and the audio output control module 200 is connected to the audio conversion module 100 and is used to connect the audio playback device 400 and the host power supply 500, respectively. The host power supply 500 may be a power supply device for providing a strong electrical power to the digital conference host to drive the high power device.

The host control module 300 may detect a continuous power-up duration of the digital conference host, that is, a current continuous power-up duration of the digital conference host. For example, if the digital conference host is powered up at 19:00:00 and continues until now, and the current time is 19:00:20, the continuous power up duration may be 20 seconds.

The host control module 300 may compare the continuous power-up duration to a preset duration threshold. When the continuous power-on duration is less than the duration threshold, the host control module 300 outputs a turn-off control signal to the audio output control module 200, so that the audio output control module 200 disconnects the audio conversion module 100 from the audio playing device 400 to avoid host power-on induced impact sound. When the continuous power-on duration is greater than or equal to the duration threshold, the host control module 300 may output a turn-on control signal to the audio output control module 200 such that the audio output control module 200 turns on the connection between the audio conversion module 100 and the audio playback device 400. When the audio output control module 200 is connected in a conductive manner, the audio playing device 400 may acquire the analog audio signal to be played output by the audio conversion module 100, so that audio playing may be completed according to the analog audio signal to be played.

Meanwhile, considering that the power-off of the host also causes the impact sound, in the present application, the audio output control module 200 may disconnect the connection between the audio conversion device and the audio playback device 400 when the power-off of the host power supply 500 is detected, so as to avoid the impact sound caused by the power-off.

It can be seen that, in the case of not setting the time-series power supply, the present application can avoid the impact sound caused by the on-off of the digital conference host by selectively turning on or off the connection between the audio conversion module 100 and the audio playback device 400 by the host control module 300 and the audio output control module 200. Therefore, a time sequence power supply is not required to be arranged in the digital conference host, and the cost can be further reduced.

In one embodiment, the audio output control module 200 may include relay circuitry and relay control circuitry. The relay circuit refers to a circuit structure which is realized based on a relay and is capable of selectively turning on or off the connection between the audio conversion module 100 and the audio playback apparatus 400. The relay control circuit means a circuit configuration for controlling an operation state of the relay circuit.

The relay control circuit may include a relay and a first switching unit 211, a first end of the first switching unit 211 being used for grounding, a second end of the first switching unit 211 being connected to a coil RE1 of the relay, the coil RE1 of the relay being used for connection to a relay driving power source. The first normally open contact of the relay is connected to the audio conversion module 100, and the second normally open contact is used to connect to the audio playback device 400. The third terminal of the first switch unit 211 is connected to a first terminal of a relay control circuit, the second terminal of the relay control circuit is connected to the host control module 300, and the third terminal of the relay control circuit is connected to the host power supply 500.

Since the relay control circuit is connected to the host control module 300 and the host power supply 500, respectively, the relay control circuit can receive the on control signal and the off control signal outputted by the host control module 300, and the relay control circuit can detect whether the host power supply 500 is powered off.

Specifically, the relay control circuit outputs the first switch control signal to the third terminal of the first switch unit 211 when receiving the on control signal output by the host control module 300, so that the first switch unit 211 may conduct the connection between the first terminal and the second terminal thereof under the action of the first switch signal. When the first switching unit 211 is turned on, the relay driving power source, the relay coil RE1, the first switching unit 211 and the ground constitute a closed loop, the relay coil RE1 is energized, and the first and second normally open contacts of the relay are closed, so that the audio conversion module 100 is connected to the audio playback apparatus 400.

The relay control circuit may disconnect the first switching unit 211 when receiving the off control signal or detecting that the host power supply 500 is powered off. In this case, the relay power supply and the coil RE1 of the relay cannot form a closed loop, the coil RE1 of the relay is powered off, the first normally open contact and the second normally open contact are disconnected, and the audio conversion module 100 is disconnected from the audio playback apparatus 400.

In this embodiment, the audio output control module 200 is implemented by a relay circuit and a relay control circuit, so that the driving power can be reduced, and the running cost of the digital conference host can be further reduced.

In one embodiment, the relay control circuit of the present application may include a second switching unit 213 and a third switching unit 215. The first end of the second switch unit 213 may be used for grounding, the second end of the second switch unit 213 is connected to the third end of the first switch unit 211, and the third end of the second switch unit 213 is connected to the host control module 300. The first end of the third switch unit 215 is used for grounding, the second end of the third switch unit 215 is connected with the third end of the first switch unit 211, the third end of the third switch unit 215 is used for being connected with a relay driving power supply, and the fourth end of the third switch unit 215 is used for being connected with a host power supply 500.

Specifically, since the second switching unit 213 is connected to the host control module 300, the third terminal of the second switching unit 213 may receive the on control signal or the off control signal outputted by the host control module 300. Upon receiving the turn-off control signal, the second switching unit 213 may turn on the connection between the first and second terminals thereof, in which case the third terminal of the first switching unit 211 may be grounded via the second switching unit 213, the first switching unit 211 is turned off, the relay is powered off, and the audio conversion module 100 is disconnected from the audio playback apparatus 400. Upon receiving the on control signal, the second switching unit 213 may disconnect the connection between the first and second terminals thereof, in which case the on-off state of the first switching unit 211 is associated with the on-off state of the third switching unit 215.

When the second switching unit 213 receives the on control signal, it indicates that the digital conference host is currently in a power-on state, that is, the host power supply 500 is powered on. The third switching unit 215 may disconnect the connection between the first and second terminals thereof when the host power supply 500 is powered up. In this case, since the third terminal of the third switching unit 215 is used to connect the relay driving power source, the third terminal voltage of the first switching unit 211 is pulled up to the voltage of the relay driving power source through the third switching unit 215, as pulled up to 12 volts. When the third terminal voltage of the first switching unit 211 is pulled high, the first switching unit 211 is turned on, and the relay coil RE1 is energized, so that the audio conversion module 100 is connected to the audio playing device 400.

When it is detected that the host power supply 500 is powered off, the third switch unit 215 may conduct the connection between the first end and the second end thereof, so that the third end of the first switch unit 211 may be grounded via the third switch unit 215, and the first switch unit 211 is disconnected, thereby disconnecting the audio conversion module 100 from the audio playing device 400.

In this embodiment, the relay control circuit is implemented through the second switching unit 213 and the third switching unit 215, so that the circuit structure can be simplified, and the circuit cost can be reduced, so as to further reduce the cost of the digital conference host.

It will be appreciated that the specific circuit structures of the first switch unit 211, the second switch unit 213 and the third switch unit 215 may be determined according to practical situations, and may have various implementations.

In one embodiment, the specific circuit structure of the audio output control module 200 may be as shown in fig. 2, wherein the relay circuit includes a first diode D1, a relay, and a first switching unit 211, the first switching unit 211 includes a first switching tube Q1 and a first resistor R1, the second switching unit 213 includes a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, and the third switching unit 215 includes a fifth switching tube Q5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, and a second diode D2. Further, each switching tube can be a triode.

The first end of the coil RE1 of the relay is respectively connected with a 12V relay working power supply and the cathode of the first diode D1, the second end of the coil RE1 of the relay is respectively connected with the anode of the first diode D1 and the collector of the first switch tube Q1, the transmitter of the first switch tube Q1 is used for grounding, and the base of the first switch tube Q1 is connected with the first end of the first resistor R1.

The first end of the second resistor R2 is connected with the host control module 300, the second end is connected with the base electrode of the second switching tube Q2, the collector electrode of the second switching tube Q2 is respectively connected with the first end of the third resistor R3 and the emitter electrode of the third switching tube Q3, the collector electrode of the third switching tube Q3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the base electrode of the fourth switching tube Q4, and the collector electrode of the fourth switching tube Q4 is connected with the second end of the first resistor R1. The base electrode of the third switching tube Q3 is connected with the first end of the fifth resistor R5, and the second end of the fifth resistor R5, the emitter electrode of the second switching tube Q2 and the emitter electrode of the fourth switching tube Q4 are all grounded. The second end of the third resistor R3 is connected with a relay driving power supply.

The negative pole of second diode D2 is used for connecting host power supply 500, and the positive pole of second diode D2 is connected respectively the first end of sixth resistance R6, the first end of first electric capacity C1 and the first end of seventh resistance R7, and the first end of eighth resistance R8 and the base of fifth switch tube Q5 are connected respectively to the second end of fifth switch tube Q5, and the second end of first resistance R1 and the first end of ninth resistance R9 are connected respectively to the collecting electrode of fifth switch tube Q5, and the second end of ninth resistance R9 and the second end of eighth resistance R8 are used for connecting relay drive power supply. The emitter of the fifth switch Q5, the second end of the sixth resistor R6, and the second end of the first capacitor C1 are all grounded. Further, the cathode of the second diode D2 may be used to connect the secondary tap of the power transformer.

In the circuit structure shown in fig. 2, under the condition that the digital conference host is started, the first capacitor C1 can be charged by half-wave rectification voltage output by the secondary tap of the power transformer, the base voltage of the fourth switching tube Q4 is-6.7V, and the fifth switching tube Q5 is turned off. Meanwhile, when the digital conference host is started, the host control module 300 outputs a low-level control signal, and the second switching tube Q2 is turned off, so that the third switching tube Q3 is turned on. When the third switching tube Q3 is turned on, the fourth switching tube Q4 is turned on, the second terminal voltage of the first resistor R1 is pulled down to the ground, and the first switching tube Q1 is turned off. Accordingly, the coil RE1 of the relay is powered down, and the audio conversion module 100 and the audio playback apparatus 400 are disconnected. When the power is continuously applied and the preset duration threshold value is passed, the host control module 300 outputs a high-level control signal, the second switching tube Q2 is turned on, the third switching tube Q3 is turned off, the fourth switching tube Q4 is turned off, 12 volts pass through the ninth resistor R9 and the first resistor R1 to the base electrode of the first switching tube Q1, so that the base electrode voltage of the first switching tube Q1 is 0.6V, the first switching tube Q1 is turned on, the relay coil RE1 is electrified, and the audio conversion module 100 is connected with the audio playing device 400.

In the case of the digital conference host being powered off, the first capacitor C1 is rapidly discharged through the second diode D2, the sixth resistor R6 and the secondary tap of the power transformer. When the base voltage of the fifth switching tube Q5 is greater than 0.6 v, the fifth switching tube Q5 is turned on, and the base voltage of the first switching tube Q1 is pulled down to the ground through the fifth switching tube Q5, so that the first switching tube Q1 is turned off, and the audio conversion module 100 and the audio playback device 400 are disconnected.

In one embodiment, as shown in fig. 3, the audio conversion module 100 of the present application may include a network communication circuit 110, an audio codec circuit 120, a volume control circuit 130, and an audio input control circuit 140. The network communication circuit 110 refers to a circuit structure or a device that performs network communication with a teleconference device (such as a pickup), so that a digital conference host can perform control data and audio transmission with the teleconference device. The audio codec circuit 120 refers to a circuit structure or a device for implementing audio decoding, and further, the audio codec circuit 120 may also be used for implementing audio encoding. The audio input control circuit 140 may be configured to receive audio source signals input by an audio input device, for example, may receive audio source signals input by an alert audio source device and an AUX audio source device (i.e., auxiliary audio source devices). The volume control circuit 130 refers to a circuit structure or device for adjusting a volume value of an analog audio signal.

Specifically, the network communication circuit 110 is connected to the switch and the audio codec circuit 120, the audio codec circuit 120 is connected to the volume control circuit 130, the volume control circuit 130 is connected to the audio input control circuit 140 and the audio output control module 200, and the audio input control circuit 140 is operable to connect to an audio input device. The network communication circuit 110 may receive the original digital audio signal transmitted via the switch, and send the received original digital audio signal to the audio codec circuit 120, so as to decode the original digital audio signal by the audio codec circuit 120, thereby obtaining an original analog audio signal. The audio input control circuit 140 is configured to amplify an analog audio signal input by an audio input device to obtain an amplified analog audio signal. The volume control circuit 130 may perform volume adjustment on the original analog audio signal output by the audio codec circuit 120 and/or the amplified analog audio signal output by the audio input control circuit 140 to obtain an analog audio signal to be played.

By implementing the audio conversion module 100 according to the structure of the present embodiment, the digital conference host can play both remote audio and analog audio input by the audio input device, so that the applicability of the digital conference host can be widened.

In one embodiment, as shown in fig. 3, the digital conference host may further include a video matrix switching module 600. The video matrix switching module 600 includes a 4k video processor chip, and the 4k video processor chip is connected to the host control module 300 and is used for connecting to a video playing device. It will be appreciated that the 4K video processor chip of the present application may be determined according to practical situations such as cost budget, video definition requirements, number of connected video playback devices, and the like, which is not particularly limited herein. In one example, the present application may employ a MS1825 model 4K video processor chip with 4-way input HDMI (High Definition Multimedia Interface, high definition multimedia), 4-way output HDMI, which may implement a 4X4 seamless matrix. Meanwhile, 2X2 mode or up-down four-split screen mode splicing and four-picture mode segmentation can be realized.

In one embodiment, as shown in fig. 4, the audio input control circuit 140 of the present application may include a first amplifying unit 141, a second amplifying unit 143, a third amplifying unit 145, and a fourth switching unit 147. The first amplification unit 141 may be used to connect to an AUX audio input device and the second amplification unit 143 may be used to connect to an alarm audio input device. The fourth switching unit 147 may have a first terminal connected to the ground, a second terminal connected to the first amplifying unit 141, a third terminal connected to the second amplifying unit 143, and a fourth terminal connected to the third amplifying unit 145. The third amplifying unit 145 is also connected to the volume control circuit 130 and the second amplifying unit 143, respectively.

Specifically, the first amplifying unit 141 may be configured to amplify an input AUX audio signal and output the amplified AUX audio signal. The second amplifying unit 143 may be used to amplify the input alert audio signal and output the amplified alert audio signal. When the alert audio input device outputs the alert audio signal to the second amplifying unit 143, the second amplifying unit 143 may output the amplified alert audio signal to the fourth switching unit 147, thereby turning on the connection between the first and second ends of the fourth switching unit 147. In the case where the fourth switching unit 147 is turned on, the amplified AUX audio signal outputted from the first amplifying unit 141 flows to the ground instead of the third amplifying unit 145. In this case, since the third amplifying unit 145 is connected to the second amplifying unit 143, the third amplifying unit 145 may receive the amplified alarm audio signal and perform an amplifying process to obtain an amplified analog audio signal.

When the alert audio input device does not output the alert audio signal to the second amplifying unit 143, the connection between the first and second terminals of the fourth switching unit 147 may be disconnected so that the third switching unit 215 may receive the amplified AUX audio signal output from the first amplifying unit 141 and amplify it to obtain an amplified analog audio signal. Therefore, the playing priority of the alarm audio signal can be guaranteed to be higher than that of the AUX audio signal, and the method is more in line with the actual application scene.

It will be appreciated that the specific circuit configuration of the fourth switch unit 147 of the present application may be determined according to practical situations, and it has various implementation manners. In one example, as shown in fig. 4, the fourth switching unit 147 may include a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a sixth switching tube Q6. The base of the sixth switching tube Q6 is connected to the second amplifying unit 143 through the tenth resistor R10, the transmitter of the sixth switching tube Q6 may be used for grounding, the collector of the sixth switching tube Q6 may be connected to the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12, respectively, the second end of the eleventh resistor R11 is connected to the first amplifying unit 141, and the second end of the twelfth resistor R12 is connected to the third amplifying unit 145. Thus, the fourth switch unit 147 can be realized with a simple circuit structure, which can reduce the circuit volume on the one hand and the cost on the other hand.

Further, in the present application, the first amplifying unit 141, the second amplifying unit 143, and the third amplifying unit 145 may be implemented based on a chip of the NE5532 model.

In one embodiment, as shown in fig. 5, the network communication circuit 110 includes an ethernet switch chip 111. The audio codec circuit 120 includes a first PHY chip 121, a first microcontroller 123, and a first digital-to-analog conversion unit 125. The ethernet switch chip 111 is connected to the switch and the first PHY chip 121, the first PHY chip 121 is connected to the first microcontroller 123, the first microcontroller 123 is connected to the first digital-to-analog conversion unit 125, and the first digital-to-analog conversion unit 125 is connected to the volume control circuit 130. In one example, the first microcontroller 123 may be connected to the first digital-to-analog conversion unit 125 through an I2S bus.

It is understood that the network communication circuit 110 and the audio codec circuit 120 may be implemented using any type of ethernet switch chip 111, any type of PHY chip, and any type of microcontroller, and in one example, the ethernet switch chip 111 may be an RTL8305 type chip, the first PHY chip 121 may be a LAN8720 type chip, and the first microcontroller 123 may be an HPM6700 type microcontroller chip. When the ethernet switch chip 111 is implemented by an RTL8305 model chip, the ethernet switch chip 111 may communicate with the switch through an RJ45 network port. In another example, the first digital-to-analog switching unit may include 2 digital-to-analog conversion chips.

Specifically, the first microcontroller 123 may receive an original digital audio signal through the first PHY chip 121 and the ethernet switch chip 111 and transmit the original digital audio signal to the first digital-to-analog conversion unit 125, so as to perform digital-to-analog conversion on the original digital audio signal through the first digital-to-analog conversion unit 125, thereby obtaining an original analog audio signal.

Therefore, the audio encoding and decoding functions can be realized based on the microcontroller and the digital-to-analog conversion unit and by matching with a low-delay network technology, and an FPGA (Field Programmable Gate Array ) or a Dante chip is not needed, so that the cost of a host is further reduced.

Further, as shown in fig. 5, in order to transmit the audio signal to other conference devices, the audio codec circuit 120 may further include a second analog-to-digital conversion unit 127. The second analog-to-digital conversion unit 127 may be connected to the first microcontroller 123 via an I2S bus and may be used to connect a microphone. The second analog-to-digital conversion unit 127 may be used to convert the analog audio signal collected by the sound pickup into a digital audio signal and transmit the digital audio signal to the switch via the first microcontroller 123, the first PHY chip 121, and the first ethernet switch chip 111.

In one embodiment, as shown in fig. 6, the volume control circuit 130 includes a digital signal processor 131, a first analog-to-digital conversion unit 133, and a second digital-to-analog conversion unit 135. The digital signal processor 131 is respectively connected to the first analog-to-digital conversion unit 133 and the second digital-to-analog conversion unit 135, the first analog-to-digital conversion unit 133 is respectively connected to the audio codec circuit 120 and the audio input control circuit 140, and the second digital-to-analog conversion unit 135 is connected to the audio output control module 200. In one example, the first analog-to-digital conversion unit 133 may include 2 analog-to-digital conversion chips, and the second digital-to-analog conversion unit 135 may include 1 digital-to-analog conversion chip.

Specifically, the digital signal processor 131 may detect an actual volume value of the original analog audio signal and/or the amplified analog audio signal, and adjust the volume of the original analog audio signal and/or the amplified analog audio signal when the actual volume value is greater than a preset volume threshold value, so as to obtain an analog audio signal to be played. The actual volume value of the analog audio signal to be played is less than or equal to the volume threshold. In this way, the volume control circuit 130 can avoid the occurrence of howling, and an audio processor is not required to be arranged in the digital conference host, so that the cost of clients can be further reduced.

Further, the volume threshold may be input by the user through the host control module 300, or may be predetermined by the host control module 300 according to the field test condition. The volume threshold may be stored in the host control module 300, and the digital signal processor 131 may detect the value of the register in real time, thereby obtaining the volume threshold. In the working process of the digital conference host, the digital signal processor 131 can detect the sum of the actual volume values of each path of audio signals, and automatically adjust the collected data of the first analog-to-digital conversion unit 133 when the sum of the actual volume values is greater than the volume threshold value, so as to ensure that the analog audio signal to be played, which is obtained through the conversion of the second analog-to-digital conversion unit 135, has the actual volume value smaller than the volume threshold value, and avoid howling.

In one embodiment, as shown in fig. 7, the network communication circuit 110 includes an ethernet switch chip 111, and the host control module 300 includes a second PHY chip 311, a second microcontroller 313, and a touch display device 315. The second microcontroller 313 is connected to the audio output control module 200, the second PHY chip 311, and the touch display device 315, respectively, and the second PHY chip 311 is connected to the ethernet switch chip 111. Further, the second microcontroller 313 may also be connected to the video matrix switching module 600 and the volume control circuit 130 through an I2C bus, and the second microcontroller 313 may be connected to the audio output control module 200 through an input/output port.

It is understood that any type of microcontroller, any type of PHY chip, and any type of touch display device 315 may be used to implement the control module. In one example, the second microcontroller 313 may be an HPM6700 model microcontroller and the second PHY chip 311 may be a LAN8720 model chip.

In this embodiment, by setting the touch display device 315, a user can conveniently input and view the operation parameters of the digital conference host, so as to improve the convenience of use of the digital conference host.

In one embodiment, a digital conference system is provided per se. As shown in fig. 8, the digital conference system includes:

a switch connected to each of the microphones;

the digital conference host as in any above embodiment, wherein the audio conversion module 100 of the digital conference host is connected to the switch.

Further, the digital conference system of the present application may further include a sound console, a power amplifier, an audio playing device 400, a camera device, and a display device.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Herein, "a," "an," "the," and "the" may also include plural forms, unless the context clearly indicates otherwise. Plural means at least two cases such as 2, 3, 5 or 8, etc. "and/or" includes any and all combinations of the associated listed items.

In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and may be combined according to needs, and the same similar parts may be referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital conference host, comprising:

2. The digital conference host as claimed in claim 1, wherein the audio output control module comprises:

3. The digital conference host computer of claim 2, wherein said relay control circuit comprises:

4. The digital conference host as claimed in claim 1, wherein the audio conversion module comprises:

5. The digital conference host as claimed in claim 4, wherein the audio input control circuit comprises:

6. The digital conference host as claimed in claim 4, wherein the network communication circuit comprises an ethernet switch chip, and the audio codec circuit comprises a first PHY chip, a first microcontroller, and a first digital-to-analog conversion unit;

7. The digital conference host as claimed in claim 4, wherein the volume control circuit comprises a digital signal processor, a first analog-to-digital conversion unit and a second digital-to-analog conversion unit;

8. The digital conference host as claimed in any one of claims 4 to 7, wherein the network communication circuit comprises an ethernet switch chip, the host control module comprising a second microcontroller, a second PHY chip and a touch display device;

9. The digital conference host as claimed in any one of claims 1 to 7, further comprising a video matrix switching module comprising a 4k video processor chip connected to the host control module and for connecting to a video playback device.

10. A digital conference system, the digital conference system comprising:

a switch connected to each of the microphones;

the digital conference host as claimed in any one of claims 1 to 9, wherein an audio conversion module of the digital conference host is connected to the switch.