CN210804730U

CN210804730U - Wireless conference system capable of automatically starting and stopping conference microphone unit

Info

Publication number: CN210804730U
Application number: CN201921744052.4U
Authority: CN
Inventors: 徐永强
Original assignee: Relacart Electronics Co ltd
Current assignee: Relacart Electronics Co ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-19
Anticipated expiration: 2029-10-17

Abstract

The utility model relates to a voice conference technical field discloses automatic wireless conference system who opens and close meeting microphone unit, include: wireless host computer and wireless microphone unit, wireless host computer includes: the first voltage-reducing chip, the second voltage-reducing chip, the host microcontroller, the radio frequency transceiver and the power switch S1 are connected with corresponding circuits, and the host microcontroller transmits a 'start-up' instruction to the host radio frequency transceiver every hundreds of milliseconds or stops sending the 'start-up' instruction; the wireless microphone unit includes: the booster chip, the clock IC, the microphone microcontroller and the microphone radio frequency transceiver are connected through corresponding circuits, the clock IC supplies power to the booster chip every tens of seconds, the microphone microcontroller supplies power to the booster chip for a long time after being electrified, communicates with the wireless host and stops supplying power to the booster chip. The utility model discloses can automatic start and stop meeting microphone unit, the staff that need not manager one goes to close microphone unit, its easy operation, swift, convenient.

Description

Wireless conference system capable of automatically starting and stopping conference microphone unit

Technical Field

The utility model relates to a voice conference system, especially a can realize opening automatically or close wireless conference system of meeting microphone unit.

Background

In modern conference rooms, conference audio (video) systems have become conventional devices, and in the prior art, conference audio systems generally comprise: the device comprises a chairman microphone, a delegate mat microphone, a conference central control host, a power amplifier, a sound box and the like. Conference audio (video) system generally divide into wired system and wireless system, and wherein, wireless meeting microphone unit convenient to use can change the locating position in a flexible way according to the needs of meeting, but, the microphone of wireless meeting system is opened and close and needs the manual work to go to open or close the microphone unit one by one to increase staff's work load, reduce the work preparation efficiency of meeting.

In addition, the above wireless functions are generally implemented by wireless transmission and reception using the protocol of LoRa, which is a low power consumption local area network wireless standard created by SEMTECH corporation, and there are problems that: the LoRa chip works unidirectionally, and cannot receive signals simultaneously during transmitting, that is, cannot transmit or receive signals simultaneously, and when a plurality of microphone units transmit signals simultaneously, a host computer may delay receiving signals of a certain microphone unit. Moreover, the wireless conference microphone unit needs to be placed in a range where the system signal can be received, and if the wireless conference microphone unit exceeds the range, the wireless conference microphone unit is not controlled and crashes and the like.

Disclosure of Invention

The utility model aims at providing a simple operation, swift, convenient wireless conference system of automatic opening and closing meeting microphone unit in order to solve the defect that the microphone unit of current wireless conference system needs artifical one to open or close.

In order to achieve the above purpose, the utility model discloses a: wireless host computer and wireless microphone unit, wireless host computer includes: the wireless microphone comprises a first voltage reduction chip, a second voltage reduction chip, a host microcontroller and a host radio frequency transceiver, wherein the input ends of the first voltage reduction chip and the second voltage reduction chip are connected to a host power supply at the same time, the first voltage reduction chip is connected to the host microcontroller and the host radio frequency transceiver respectively and supplies power for the output voltage of the host microcontroller, a power switch S1 is arranged in a circuit of the second voltage reduction chip and the host power supply, meanwhile, the second voltage reduction chip is connected to a power switch pin of the host microcontroller through a power switch S1, the host microcontroller transmits a 'starting' command to the host radio frequency transceiver every hundreds of milliseconds, and stops sending the 'starting' command after receiving the 'starting' command of a wireless microphone unit fed back by the host radio frequency transceiver;

the wireless microphone unit includes: the microphone unit comprises a boost chip, a clock IC, a microphone microcontroller and a microphone radio frequency transceiver, wherein the boost chip is used for supplying power to the microphone microcontroller and output voltages of other functional circuits of the microphone unit after receiving power; the clock IC is still supplied with power by the power input end in the shutdown state, and outputs a high level and a low level every tens of seconds to control the conduction state of each circuit element to supply power to the boost chip; the microphone microcontroller outputs a high level for a long time after being electrified to conduct all circuit elements to supply power to the boost chip, receives a 'start-up' instruction of the wireless host through the microphone radio-frequency transceiver, replies the 'started-up' state to the wireless host through the microphone radio-frequency transceiver, or outputs a low level to control all circuit elements to be in a stop state when the 'start-up' instruction sent by the wireless host is not received, stops supplying power to the boost chip, and sends a working instruction for entering a new round of timing to the clock IC.

Furthermore, the host microcontroller also counts the number of the started microphone units and displays the number of the started microphone units through the OLED screen.

Compared with the prior art, the utility model, can be very big make things convenient for the meeting administrator to manage the meeting, the meeting administrator only need open the wireless host power, it will the wireless microphone unit of active control open and be in operating condition, do not need administrator one to go to open the microphone unit, save numerous and complicated operation and saved the time, after the meeting, only need to close the wireless host power, the wireless host also can send the wireless microphone unit of instruction control and close the power and be in the power off state, also do not need a staff to close the microphone unit, the operation is simple, and is fast, and convenient.

Drawings

Fig. 1 is a circuit diagram of the wireless host of the present invention.

Fig. 2 is a circuit diagram of the wireless microphone of the present invention.

Detailed Description

The present invention is mainly used by the wireless host and the wireless microphone unit, and the following description will be made in further detail with reference to the accompanying drawings for better understanding the specific structure and working principle of the present invention.

Referring to fig. 1, in a preferred embodiment, a wireless host includes: the main machine power supply DC, the first voltage reduction chip DC-DC, the second voltage reduction chip DC-DC, the main machine microcontroller MCU, the main machine radio frequency transceiver LoRa and its antenna circuit LoRa, other circuit elements and software programs, wherein, the other circuit elements mainly include a power switch S1, resistors R1 and R2, triodes Q1 and Q3, and a MOS tube Q2. The host power supply DC provides a power supply for the whole wireless host, 12V voltage output is adopted, one path of the anode of the host power supply is connected with a first voltage reduction chip, the output end of the first voltage reduction chip is respectively connected with a host microcontroller MCU and a host radio frequency transceiver LoRa to provide 3V3 voltage output for the host power supply, one interface of the host microcontroller MCU is connected with the host radio frequency transceiver LoRa, and the host radio frequency transceiver receives and transmits signals through an antenna circuit of the host radio frequency transceiver to realize the wireless communication function of the host; the other path of the positive pole of the host POWER supply is respectively connected to one end of a POWER switch S1 and the source of Q2, the other end of the POWER switch S1 is connected to the connection point between R1 and R2, the drain of Q2 is connected to the input end of a second buck chip, the second buck chip provides voltage output of +1.2V, +3.3V, +5V, +8V and the like, and can supply POWER to other functional circuits of the wireless host, the grid of Q2 is connected to the collector of Q1, the emitter of Q1 is grounded, the base of Q1 is connected to the base of Q3 through resistors R2 and R1, the emitter of Q3 is grounded, and the collector of Q3 is connected to a POWER switch pin POWER SW of the host microcontroller; the negative pole of the host power supply circuit is grounded.

Referring to fig. 2, in a preferred embodiment, the wireless microphone unit includes: microphone power, clock IC, microphone microcontroller MCU, microphone radio frequency transceiver LoRa and antenna circuit, other circuit element and software program thereof, wherein, other circuit element mainly include: the boost circuit comprises a boost chip, triodes Q1 and Q2, a MOS transistor Q3 and a diode D1. The microphone power supply supplies power to the whole wireless microphone unit, a battery module is used as the power supply, the output voltage of the battery module is 2 multiplied by 1.5V, the cathode of the microphone power supply is grounded, the anode of the microphone power supply is respectively connected to the source electrodes of a clock IC and a Q3, and the clock IC is also connected to an interface of a microphone microcontroller MCU; the drain of Q3 is connected to the input end of the boost chip, the boost chip is connected to the microphone microcontroller, and the output voltage +3.3V, +5V, +12V supplies power to other various functional circuits of the wireless microphone unit, the grid of Q3 is connected to the collector of Q2, the emitter of Q2 is grounded, the base of Q2 is connected to the emitter of Q1 and the cathode of D1 respectively, the base of Q1 is connected to the clock IC, the connection point of Q1 connected to the positive pole of the power supply circuit and the source of Q3; the anode of D1 is connected to an interface of the microphone microcontroller. The microphone radio frequency transceiver is connected to an interface of the microphone microcontroller and transmits and receives signals through its antenna.

The utility model discloses a circuit control combines the software program to carry out supervisory control, and its wireless host computer and wireless microphone unit theory of operation are as follows.

1. The starting control of the wireless host computer has the working principle that: when a wireless host of the conference system is connected with a host power supply DC, the first voltage reduction chip outputs a 3.3V power supply to supply power to the host microcontroller MCU and the host radio frequency transceiver LoRa, and the host microcontroller is in a standby state. When a power switch S1 of the wireless host is closed, the triode Q1 is powered on and conducted, the field effect transistor (namely the MOS transistor) Q2 is controlled to be conducted, the host power supply DC supplies power to the second voltage reduction chip DC-DC through the Q2, and the second voltage reduction chip outputs voltages of +1.2V, +3.3V, +5V and +8V to supply power to other functional circuits of the wireless host. Meanwhile, the triode Q3 is powered on, the POWER switch pin POWER SW of the host microcontroller is switched from high level to low level, and the host microcontroller is switched to normal operating mode. The other units of the wireless host start to work normally after being electrified, the host microcontroller transmits a starting command to the host radio frequency transceiver LoRa through the SIP bus every hundreds of milliseconds, the interval of the milliseconds can be set to be 500-600 ms, the time is set to 500ms, when the host RF transceiver receives the power-on command, the power-on command is transmitted to the antenna LoRa to be transmitted, the duration of the transmission command can be several tens of seconds, the duration of the second can be set to be 70-75 seconds, the setting time is preferably 75 seconds, the host radio frequency transceiver also receives the 'started' command fed back by the wireless microphone unit and transmits the 'started' command to the host microcontroller in the period of time, the host microcontroller stops sending the 'started' command after transmitting the 'started' command for 75 seconds, and counting the number of the started microphone units, and then displaying the number through an OLED display screen.

When the POWER switch S1 is turned off, the MCU and the LoRa can still work normally, the transistor Q3 is turned off, the POWER SW pin of the MCU is turned from low level to high level, the MCU detects the level change of the POWER SW pin and transmits the POWER off command to the rf transceiver via the SPI, the rf transceiver transmits the POWER off command to the antenna LoRa to transmit the POWER off command, and the MCU stays in sleep mode after receiving the POWER off command from all the microphone units, thereby implementing low POWER consumption.

2. The operation principle of the opening and closing control of the wireless microphone unit is as follows.

1) Automatically turning on the wireless microphone unit: under the condition that the microphone unit is shut down, a microphone power supply circuit of the microphone unit can still continuously supply power to a clock IC, a high level control triode Q1 is output by an internal clock chip every tens of seconds to conduct, the interval time can be set to be 58-60 seconds, 1 minute is set at the interval, the power supply supplies power to a triode Q2 through a triode Q1, a Q2 conducts and controls a field effect tube (namely an MOS tube) Q3 to conduct, the microphone power supply supplies power to a boost chip DC-DC through a Q3, the boost chip outputs voltages of +3.3V, +5V and +12V to supply power to other functional circuits of the wireless microphone unit, a microphone microcontroller MCU is reset to be in a waiting mode after being electrified and simultaneously outputs a high level control diode D1 to conduct and supply power to the triode Q2, so that the microphone power supply can continuously supply power to the boost chip DC-DC through the boost chip Q3, and then the microphone microcontroller transmits a receiving mode instruction to a microphone radio frequency transceiver LoRa through an SPI, the receiving time can be set to be 3-4 seconds, the set receiving time is 3 seconds, if a 'starting up' instruction sent by the wireless host is received in the 3 seconds, the microphone microcontroller outputs a high level to control the diode D1 to be conducted for a long time to supply power to the Q2, the boost chip receives power for a long time and outputs voltage to supply power to each functional module, the wireless microphone unit is started to be in a working state, and meanwhile, the instruction is transmitted to the microphone radio frequency transceiver to send a 'started up' reply through the antenna LoRa matching circuit. Otherwise, if a power-on command sent by the host is not received within 3 seconds of reception, the microphone microcontroller outputs a low-level control diode D1 to be in a cut-off state, the transistors Q1, Q2 and the field-effect tube Q3 are also in a cut-off state, the power supply cannot supply power to the boost chip through the field-effect tube Q3, the microphone radio-frequency transceiver circuit and the microphone microcontroller are in a power-off state, the microphone microcontroller transmits a command to the clock chip IC through the I C bus while the power is off, the clock chip IC starts a new round of timing operation, and the microphone unit continues to be in a power-off state.

2) Automatically turning off the wireless microphone unit: when the wireless host is disconnected with the POWER switch S1, the triode Q3 of the wireless host is changed into a cut-off state, the POWER SW pin of the MCU of the host is changed from low level to high level, the host microcontroller transmits a 'POWER-off' command to the host radio frequency transceiver LoRa through the SPI bus after detecting the level change of the Power SW pin, and the host radio frequency transceiver transmits the 'POWER-off' command to the LoRa antenna to be transmitted. When a microphone radio frequency transceiver LoRa of the microphone unit receives a 'shutdown' command through an antenna LoRa of the microphone unit, the command is transmitted to the microphone microcontroller through an SPI bus of the microphone unit, the microphone microcontroller outputs low level to control a diode D1 of the microphone unit to be in a cut-off state, triodes Q1 and Q2 of the microphone unit and a field-effect tube Q3 of the microphone unit are also in the cut-off state, a power supply cannot supply power to a boost chip DC-DC through the field-effect tube Q3, and the microphone unit is in the shutdown state.

Claims

1. A wireless conferencing system that automatically turns on and off a conference microphone unit, comprising: a wireless host and a wireless microphone unit, which is characterized in that,

the wireless host includes: the wireless microphone comprises a first voltage reduction chip, a second voltage reduction chip, a host microcontroller and a host radio-frequency transceiver, wherein the input ends of the first voltage reduction chip and the second voltage reduction chip are connected to a host power supply at the same time, the first voltage reduction chip is connected to the host microcontroller and the host radio-frequency transceiver respectively and supplies power for the output voltage of the host microcontroller, a power switch S1 is arranged in a circuit of the second voltage reduction chip and the host power supply, meanwhile, the second voltage reduction chip is connected to a power switch pin of the host microcontroller through a power switch S1, the host microcontroller transmits a 'starting' command to the host radio-frequency transceiver every hundreds of milliseconds, and stops sending the 'starting' command after receiving the 'starting' command of a wireless microphone unit fed back by the host radio-frequency transceiver;

the wireless microphone unit includes: the microphone comprises a boost chip, a clock IC, a microphone microcontroller and a microphone radio frequency transceiver, wherein the boost chip supplies power for the microphone microcontroller and the output voltage of other functional circuits of a microphone unit after receiving power; the clock IC is still supplied with power by the power input end in the shutdown state, and outputs a high level and a low level every tens of seconds to control the conduction state of each circuit element to supply power to the boost chip; the microphone microcontroller outputs high level for a long time after being electrified to conduct all circuit elements to supply power to the boost chip, receives a 'starting up' instruction of the wireless host through the microphone radio frequency transceiver, replies the 'started up' state to the wireless host through the microphone radio frequency transceiver, or outputs low level to control all circuit elements to be in a cut-off state when the 'starting up' instruction sent by the wireless host is not received, stops supplying power to the boost chip, and sends a working instruction for entering a new round of timing to the clock IC.

2. The wireless conference system capable of automatically starting and stopping the conference microphone unit as claimed in claim 1, wherein the host microcontroller further counts the number of the started microphone units and displays the number of the started microphone units through an OLED screen.