Intercom system with voice reception function

Abstract

The utility model discloses a kind of intercom systems of voice receiving function, intercom system includes server and user end, server is connected with user end communication;The user end includes: voice receiving module, for receiving voice signal from server;Key module, key module is used to send call signal to server;MCU control module is connected voice receiving module and key module respectively;MCU control module controls key module to send call signal.The beneficial effects of the utility model are: after user presses key module, MCU control module controls key module to send call signal to server, server service personnel receives call signal to user in real time and sends voice signal, to inform user relevant information in time, without waiting for service personnel to arrive to be able to explain own demand, to save the communication time of user, improve communication efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of voice communication technology, and specifically relates to an intercom system with voice receiving function. Background Technology

[0002] Currently, e-sports hotels, internet cafes, and card rooms typically only have call buttons. After pressing the button, the front desk staff needs to walk to the user at the corresponding location to inquire about the service required and then return to the front desk to retrieve the relevant items. This results in very low communication efficiency and an inability to quickly meet customer needs. Utility Model Content

[0003] To address the aforementioned problems, the primary objective of this invention is to provide an intercom system with voice reception functionality to resolve the aforementioned technical issues.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] Please see Figure 1 The first aspect of this utility model provides an intercom system with voice transmission and voice reception functions. The intercom system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0006] The user terminal includes:

[0007] The voice transmission module is used to send call signals and user voice signals to the server;

[0008] The voice receiving module is used to receive voice signals from the server.

[0009] Button module;

[0010] The MCU control module is connected to the voice transmission module, the voice reception module, and the button module, respectively.

[0011] The MCU control module controls the voice transmission module to send call signals and user voice signals.

[0012] Preferably, the call signal may include prompts such as "A customer is calling from seat xx" or "A customer in room xx needs service." It should be noted that the above is only an example and this application does not limit it.

[0013] Preferably, the server can be set up in the front desk area of ​​e-sports hotels, internet cafes, card rooms, etc., to provide services to users, while the user terminal can be set up in the rooms of e-sports hotels, next to the computers in internet cafes, card tables in card rooms, etc.

[0014] Compared to existing technologies, the advantages of an intercom system with voice transmission and reception functions are as follows: After the user presses the button module, the MCU control module controls the voice transmission module to send a call signal and the user's voice signal to the server, and the voice reception module receives the voice signal from the server personnel, thus enabling real-time voice communication between the user and the server. Users can quickly and promptly state their needs without waiting for service personnel to arrive, saving communication time and improving efficiency. Server personnel can learn the caller's specific room number or location in advance through the call signal, facilitating subsequent voice communication and saving their own time, thus improving overall communication efficiency.

[0015] Please see Figure 2 The second aspect of this utility model provides an intercom system with voice transmission function. The intercom system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0016] The user terminal includes:

[0017] The voice transmission module is used to send call signals and user voice signals to the server;

[0018] Button module;

[0019] The MCU control module is connected to the voice transmission module and the button module respectively;

[0020] The MCU control module controls the voice transmission module to send call signals and user voice signals.

[0021] Compared with existing technologies, the advantages of an intercom system with voice transmission function are as follows: After the user presses the button module, the MCU control module controls the voice transmission module to send a call signal and the user's voice signal to the server, so as to inform the server personnel of their specific service needs in real time, without having to wait for the service personnel to arrive before explaining their needs, thereby saving the user's communication time and improving communication efficiency; the server personnel can learn the specific room number or location of the calling user through the call signal, making it easier for the server personnel to provide services to the user and improving service efficiency.

[0022] Please see Figure 3 The third aspect of this utility model provides a two-way communication system with voice receiving function. The two-way communication system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0023] The user terminal includes:

[0024] The voice receiving module is used to receive voice signals from the server.

[0025] The button module is used to send call signals to the server.

[0026] The MCU control module is connected to the voice receiving module and the button module respectively;

[0027] The MCU control module controls the button module to send call signals.

[0028] In this embodiment, the button module includes a PTT button and a call signal transmitting unit, and the MCU chip IC3 is connected to both the PTT button and the call signal transmitting unit. After the user presses the PTT button, the MCU chip IC3 controls the call signal transmitting unit to send a call signal.

[0029] Compared with existing technologies, the advantages of a voice-receiving intercom system are as follows: after the user presses the button module, the MCU control module controls the button module to send a call signal to the server. After receiving the call signal, the server personnel send a voice signal to the user in real time to inform the user of relevant information in a timely manner, without having to wait for the service personnel to arrive before explaining their needs, thereby saving the user's communication time and improving communication efficiency.

[0030] Further, please refer to Figure 5 The MCU control module includes an MCU chip IC3, which is connected to the voice transmission module, the voice reception module, and the button module.

[0031] In another implementation, the MCU chip IC3 is connected to both the voice receiving module and the button module.

[0032] Preferably, the MCU chip IC3 can be a TA3786F.

[0033] Further, please refer to Figure 11 The button module includes a PTT button 110, a volume up button, and a volume down button;

[0034] MCU chip IC3 is connected to the PTT button via the RXD / PTT signal, and to both the volume up and volume down buttons via the VOL signal. In one working scenario, after the user presses the PTT button, the user's voice signal is transmitted to the server via the voice transmission module.

[0035] Further, please refer to Figure 4 The voice transmission module includes a microphone unit 10, a noise reduction switching unit 20, a noise reduction unit 30, a baseband processing unit 40, a drive amplification unit 50, a power amplification unit 60, a TXRX switching unit 70, a low-pass filter unit 80, and an antenna ANT connected in sequence.

[0036] In one working scenario, the microphone unit 10 at the transmitting end collects the user's voice signal. After signal switching processing by the noise reduction switching unit 20, the signal enters the baseband processing unit 40 to generate an RF carrier signal. The RF carrier signal passes through the driver amplification unit 50 and the power amplification unit 60 to generate rated RF power, and then passes through the TXRX switching unit 70 to send it to the low-pass filter unit 80 to suppress harmonic components, obtaining the transmitted signal. The transmitted signal is transmitted to the server via the antenna ANT. The transmitted signal includes the user's voice signal and call signal.

[0037] The MCU chip IC3 is connected to the microphone unit 10, noise reduction switching unit 20, noise reduction unit 30, baseband processing unit 40, driver amplification unit 50, power amplification unit 60, TXRX switching unit 70, and low-pass filter unit 80, respectively. The MCU chip IC3 controls the functional operation of each unit to control its operating state. For example, the MCU chip IC3 controls the switching between receive and transmit states in the TXRX switching unit 70.

[0038] Further, please refer to Figure 4 The voice receiving module includes an antenna ANT, a low-pass filter unit 80, a TXRX switching unit 70, a high-frequency amplification unit 90, a baseband processing unit 40, a noise reduction switching unit 20, a noise reduction unit 30, and a speaker unit 100 connected in sequence.

[0039] In one working scenario, the antenna ANT receives the voice signal sent by the server. After passing through the low-pass filter unit 80 and the TXRX switching unit 70, it is sent to the high-frequency amplification unit 90 for high-frequency amplification. The baseband processing unit 40 generates an audio signal, which is then processed by the noise reduction switching unit 20. After that, it is input to the noise reduction unit 30 for noise reduction processing, and finally the audio is output through the speaker unit 100.

[0040] The MCU chip IC3 is connected to the low-pass filter unit 80, the TXRX switching unit 70, the high-frequency amplification unit 90, the baseband processing unit 40, the noise reduction switching unit 20, the noise reduction unit 30, and the speaker unit 100, respectively. The MCU chip IC3 controls the functional operation of each unit to control its operating state. For example, the MCU chip IC3 controls the switching between receive and transmit states in the TXRX switching unit 70.

[0041] Further, please refer to Figure 6The baseband processing unit includes a baseband chip IC4, which is connected to the MCU chip IC3 via SDA4839, SCN4839, and SCK4839 signals. The MCU chip IC3 sends instructions to the baseband chip IC4 to control and manage the baseband chip IC4 to perform signal processing functions such as pre-emphasis, de-emphasis, modulation, and demodulation.

[0042] Preferably, the baseband chip IC4 can be model BK4839.

[0043] Further, please refer to Figure 7 The noise reduction switching unit includes a first signal switcher U3, a second signal switcher U4, and a third signal switcher U5. The first signal switcher U3 is connected to the second signal switcher U4, and the third signal switcher U5 is connected to the second signal switcher U4.

[0044] Preferably, the first signal switcher U3, the second signal switcher U4, and the third signal switcher U5 can be of model BL1551.

[0045] In the context of voice transmission, please refer to Figure 7 and Figure 10 The third signal switcher U5 is connected to the microphone unit via the MIC-IN signal, and the second signal switcher U4 is connected to the microphone unit via the MIC-OUT signal.

[0046] In the context of voice reception, please refer to Figure 7 and Figure 9 The third signal switcher U5 is connected to the speaker unit via the AF OUT signal.

[0047] Further, please refer to Figure 8 The noise reduction unit includes a noise reduction chip IC8. The noise reduction chip IC8 is connected to the third signal switch U5 via the NRIN signal, and the noise reduction chip IC8 is connected to the first signal switch U3 via the NRIN signal, the NROUT signal, and the PNC_POW signal.

[0048] Preferably, the noise reduction chip IC8 can be model CI13322.

[0049] Further, please refer to Figure 14 The low-pass filter unit includes inductors L1, L2, L3, L4, capacitors C5, C6, C13, and C15.

[0050] Inductors L1, L2, L3, L4, and C15 are connected in series.

[0051] Capacitor C5 is connected in parallel with inductor L2, capacitor C6 is connected in parallel with inductor L3, and capacitor C13 is connected in parallel with inductor L4.

[0052] Further, please refer to Figure 16 The TXRX switching unit includes transistors Q11 and Q2. The base of transistor Q11 is connected to MCU chip IC3 via the TX-P signal, and the base of transistor Q2 is connected to baseband chip IC4 via the RX-P signal. Transistor Q11 transmits signals, and transistor Q2 receives signals.

[0053] Preferably, transistor Q11 can be a 2SB624 and transistor Q2 can be a DTA114EE.

[0054] Further, please refer to Figure 15 The high-frequency amplification unit includes transistor Q6. The collector of transistor Q6 is connected to the collector of transistor Q2. The collector of transistor Q6 is connected to baseband chip IC4 via the RFIN signal.

[0055] Preferably, the transistor Q6 can be an FC4226.

[0056] Further, please refer to Figure 13 The power amplifier unit includes transistor Q7, which is connected to transistor Q11.

[0057] Preferably, the transistor Q7 can be of model number H0602C.

[0058] Further, please refer to Figure 13 The amplification unit includes transistor Q8, whose collector is connected to the base of transistor Q7, and whose base is connected to baseband chip IC4 via the RFOUT signal.

[0059] Preferably, the transistor Q8 can be an M5085.

[0060] Further, please refer to Figure 12 The user end also includes a power module, which comprises a power supply (POWER), a voltage regulator (Q5), and a power button (POWER1). The power supply (POWER) is connected to the voltage regulator (Q5) via the power button (POWER1), generating a stable operating voltage of 3V required by various circuits. In some implementations, the power supply (POWER) can operate intermittently to ensure power saving.

[0061] Preferably, the voltage regulator Q5 can be model LN1134A302M (3V).

[0062] Further, please refer to Figure 9The speaker unit includes an audio amplifier IC2 and a speaker. The audio amplifier IC2 is connected to the MCU chip IC3 via the TXD / BEEP signal and the POW4871 signal. The audio amplifier IC3 is connected to the second signal switcher U4 via the AF OUT signal.

[0063] Preferably, the audio amplifier IC2 can be an NS4102.

[0064] Compared with the prior art, the beneficial effects of this application are as follows: Attached Figure Description

[0065] Figure 1 This is a module diagram of an intercom system with voice transmission and reception functions.

[0066] Figure 2 This is a module diagram of an intercom system with voice reception capabilities.

[0067] Figure 3 This is a module diagram of an intercom system with voice transmission capabilities.

[0068] Figure 4 This is a module diagram of the user side.

[0069] Figure 5 This is the circuit diagram of the MCU control module.

[0070] Figure 6 This is the circuit diagram of the baseband processing unit.

[0071] Figure 7 This is the circuit diagram of the noise reduction switching unit.

[0072] Figure 8 This is the circuit diagram of the noise reduction unit.

[0073] Figure 9 This is the circuit diagram of the speaker unit.

[0074] Figure 10 This is the circuit diagram of the microphone unit.

[0075] Figure 11 This is the circuit diagram of the button module.

[0076] Figure 12 This is the circuit diagram of the power supply module.

[0077] Figure 13 This is the circuit diagram of the power amplifier unit and the driver amplifier unit.

[0078] Figure 14 This is the circuit diagram of a low-pass filter unit.

[0079] Figure 15 This is the circuit diagram of the high-frequency amplifier unit.

[0080] Figure 16 This is the circuit diagram of the TXRX switching unit.

[0081] In the diagram: 10, microphone unit; 20, noise reduction switching unit; 30, noise reduction unit; 40, baseband processing unit; 50, baseband processing unit; 60, power amplifier unit; 70, TXRX switching unit; 80, low-pass filter unit; 90, high-frequency amplifier unit; 100, speaker unit; 110, PTT button. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0083] To achieve the above objectives, the technical solution of this utility model is as follows:

[0084] Please see Figure 1 The first aspect of this utility model provides an intercom system with voice transmission and voice reception functions. The intercom system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0085] The user end includes:

[0086] The voice transmission module is used to send call signals and user voice signals to the server;

[0087] The voice receiving module is used to receive voice signals from the server.

[0088] Button module;

[0089] The MCU control module is connected to the voice transmission module, the voice reception module, and the button module, respectively.

[0090] The MCU control module controls the voice transmission module to send call signals and user voice signals.

[0091] Preferably, the call signal may include prompts such as "A customer is calling from seat xx" or "A customer in room xx needs service." It should be noted that the above is only an example and this application does not limit it.

[0092] Preferably, the server can be set up in the front desk area of ​​e-sports hotels, internet cafes, card rooms, etc., to provide services to users, while the user terminal can be set up in the rooms of e-sports hotels, next to the computers in internet cafes, card tables in card rooms, etc.

[0093] Compared to existing technologies, the advantages of an intercom system with voice transmission and reception functions are as follows: After the user presses the button module, the MCU control module controls the voice transmission module to send a call signal and the user's voice signal to the server, and the voice reception module receives the voice signal from the server personnel, thus enabling real-time voice communication between the user and the server. Users can quickly and promptly state their needs without waiting for service personnel to arrive, saving communication time and improving efficiency. Server personnel can learn the caller's specific room number or location in advance through the call signal, facilitating subsequent voice communication and saving their own time, thus improving overall communication efficiency.

[0094] Please see Figure 2 The second aspect of this utility model provides an intercom system with voice transmission function. The intercom system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0095] The user end includes:

[0096] The voice transmission module is used to send call signals and user voice signals to the server;

[0097] Button module;

[0098] The MCU control module is connected to the voice transmission module and the button module respectively;

[0099] The MCU control module controls the voice transmission module to send call signals and user voice signals.

[0100] Compared with existing technologies, the advantages of an intercom system with voice transmission function are as follows: After the user presses the button module, the MCU control module controls the voice transmission module to send a call signal and the user's voice signal to the server, so as to inform the server personnel of their specific service needs in real time, without having to wait for the service personnel to arrive before explaining their needs, thereby saving the user's communication time and improving communication efficiency; the server personnel can learn the specific room number or location of the calling user through the call signal, making it easier for the server personnel to provide services to the user and improving service efficiency.

[0101] Please see Figure 3 The third aspect of this utility model provides a two-way communication system with voice receiving function. The two-way communication system includes a server and a user terminal, and the server and the user terminal are connected in communication.

[0102] The user end includes:

[0103] The voice receiving module is used to receive voice signals from the server.

[0104] The button module is used to send call signals to the server.

[0105] The MCU control module is connected to the voice receiving module and the button module respectively;

[0106] The MCU control module controls the button module to send call signals.

[0107] In this embodiment, the button module includes a PTT button and a call signal transmitting unit, and the MCU chip IC3 is connected to both the PTT button and the call signal transmitting unit. After the user presses the PTT button, the MCU chip IC3 controls the call signal transmitting unit to send a call signal.

[0108] Compared with existing technologies, the advantages of a voice-receiving intercom system are as follows: after the user presses the button module, the MCU control module controls the button module to send a call signal to the server. After receiving the call signal, the server personnel send a voice signal to the user in real time to inform the user of relevant information in a timely manner, without having to wait for the service personnel to arrive before explaining their needs, thereby saving the user's communication time and improving communication efficiency.

[0109] In this embodiment, please refer to Figure 5 The MCU control module includes an MCU chip IC3, which is connected to the voice transmission module, the voice reception module, and the button module.

[0110] In another implementation, the MCU chip IC3 is connected to both the voice receiving module and the button module.

[0111] Preferably, the MCU chip IC3 can be a TA3786F.

[0112] In this embodiment, please refer to Figure 11 The button module includes a PTT button 110, a volume up button, and a volume down button;

[0113] MCU chip IC3 is connected to the PTT button via the RXD / PTT signal, and to both the volume up and volume down buttons via the VOL signal. In one working scenario, after the user presses the PTT button, the user's voice signal is transmitted to the server via the voice transmission module.

[0114] In this embodiment, please refer to Figure 4 The voice transmission module includes a microphone unit 10, a noise reduction switching unit 20, a noise reduction unit 30, a baseband processing unit 40, a drive amplification unit 50, a power amplification unit 60, a TXRX switching unit 70, a low-pass filter unit 80, and an antenna ANT connected in sequence.

[0115] In one working scenario, the microphone unit 10 at the transmitting end collects the user's voice signal. After signal switching processing by the noise reduction switching unit 20, the signal enters the baseband processing unit 40 to generate an RF carrier signal. The RF carrier signal passes through the driver amplification unit 50 and the power amplification unit 60 to generate rated RF power, and then passes through the TXRX switching unit 70 to send it to the low-pass filter unit 80 to suppress harmonic components, obtaining the transmitted signal. The transmitted signal is transmitted to the server via the antenna ANT. The transmitted signal includes the user's voice signal and call signal.

[0116] The MCU chip IC3 is connected to the microphone unit 10, noise reduction switching unit 20, noise reduction unit 30, baseband processing unit 40, driver amplification unit 50, power amplification unit 60, TXRX switching unit 70, and low-pass filter unit 80, respectively. The MCU chip IC3 controls the functional operation of each unit to control its operating state. For example, the MCU chip IC3 controls the switching between receive and transmit states in the TXRX switching unit 70.

[0117] In this embodiment, please refer to Figure 4 The voice receiving module includes an antenna ANT, a low-pass filter unit 80, a TXRX switching unit 70, a high-frequency amplification unit 90, a baseband processing unit 40, a noise reduction switching unit 20, a noise reduction unit 30, and a speaker unit 100 connected in sequence.

[0118] In one working scenario, the antenna ANT receives the voice signal sent by the server. After passing through the low-pass filter unit 80 and the TXRX switching unit 70, it is sent to the high-frequency amplification unit 90 for high-frequency amplification. The baseband processing unit 40 generates an audio signal, which is then processed by the noise reduction switching unit 20. After that, it is input to the noise reduction unit 30 for noise reduction processing, and finally the audio is output through the speaker unit 100.

[0119] The MCU chip IC3 is connected to the low-pass filter unit 80, the TXRX switching unit 70, the high-frequency amplification unit 90, the baseband processing unit 40, the noise reduction switching unit 20, the noise reduction unit 30, and the speaker unit 100. The MCU chip IC3 controls the functional operations of each unit to control its operating state. For example, the MCU chip IC3 controls the switching between receive and transmit states in the TXRX switching unit 70.

[0120] In this embodiment, please refer to Figure 6The baseband processing unit includes a baseband chip IC4, which is connected to the MCU chip IC3 via SDA4839, SCN4839, and SCK4839 signals. The MCU chip IC3 sends instructions to the baseband chip IC4 to control and manage the baseband chip IC4 to perform signal processing functions such as pre-emphasis, de-emphasis, modulation, and demodulation.

[0121] Preferably, the baseband chip IC4 can be model BK4839.

[0122] In this embodiment, please refer to Figure 7 The noise reduction switching unit includes a first signal switcher U3, a second signal switcher U4, and a third signal switcher U5. The first signal switcher U3 is connected to the second signal switcher U4, and the third signal switcher U5 is connected to the second signal switcher U4.

[0123] Preferably, the first signal switcher U3, the second signal switcher U4, and the third signal switcher U5 can be of model BL1551.

[0124] In the context of voice transmission, please refer to Figure 7 and Figure 10 The third signal switcher U5 is connected to the microphone unit via the MIC-IN signal, and the second signal switcher U4 is connected to the microphone unit via the MIC-OUT signal.

[0125] In the context of voice reception, please refer to Figure 7 and Figure 9 The third signal switcher U5 is connected to the speaker unit via the AF OUT signal.

[0126] In this embodiment, please refer to Figure 8 The noise reduction unit includes a noise reduction chip IC8. The noise reduction chip IC8 is connected to the third signal switch U5 via the NRIN signal, and the noise reduction chip IC8 is connected to the first signal switch U3 via the NRIN signal, the NROUT signal, and the PNC_POW signal.

[0127] Preferably, the noise reduction chip IC8 can be model CI13322.

[0128] In this embodiment, please refer to Figure 14 The low-pass filter unit includes inductors L1, L2, L3, L4, capacitors C5, C6, C13, and C15.

[0129] Inductors L1, L2, L3, L4, and C15 are connected in series.

[0130] Capacitor C5 is connected in parallel with inductor L2, capacitor C6 is connected in parallel with inductor L3, and capacitor C13 is connected in parallel with inductor L4.

[0131] In this embodiment, please refer to Figure 16 The TXRX switching unit includes transistors Q11 and Q2. The base of transistor Q11 is connected to MCU chip IC3 via the TX-P signal, and the base of transistor Q2 is connected to baseband chip IC4 via the RX-P signal. Transistor Q11 transmits signals, and transistor Q2 receives signals.

[0132] Preferably, transistor Q11 can be a 2SB624 and transistor Q2 can be a DTA114EE.

[0133] In this embodiment, please refer to Figure 15 The high-frequency amplification unit includes transistor Q6. The collector of transistor Q6 is connected to the collector of transistor Q2. The collector of transistor Q6 is connected to baseband chip IC4 via the RFIN signal.

[0134] Preferably, the transistor Q6 can be an FC4226.

[0135] In this embodiment, please refer to Figure 13 The power amplifier unit includes transistor Q7, which is connected to transistor Q11.

[0136] Preferably, the transistor Q7 can be of model number H0602C.

[0137] In this embodiment, please refer to Figure 13 The amplification unit includes transistor Q8, whose collector is connected to the base of transistor Q7, and whose base is connected to baseband chip IC4 via the RFOUT signal.

[0138] Preferably, the transistor Q8 can be an M5085.

[0139] In this embodiment, please refer to Figure 12 The user end also includes a power module, which comprises a power supply (POWER), a voltage regulator (Q5), and a power button (POWER1). The power supply (POWER) is connected to the voltage regulator (Q5) via the power button (POWER1), generating a stable operating voltage of 3V required by various circuits. In some implementations, the power supply (POWER) can operate intermittently to ensure power saving.

[0140] Preferably, the voltage regulator Q5 can be model LN1134A302M (3V).

[0141] In this embodiment, please refer to Figure 9The speaker unit includes an audio amplifier IC2 and a speaker. The audio amplifier IC2 is connected to the MCU chip IC3 via the TXD / BEEP signal and the POW4871 signal. The audio amplifier IC3 is connected to the second signal switcher U4 via the AF OUT signal.

[0142] Preferably, the audio amplifier IC2 can be an NS4102.

[0143] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An intercom system having a voice receiving function, characterized by comprising: The intercom system comprises a server and a user terminal, and the server is in communication connection with the user terminal; The user terminal comprises: a voice receiving module for receiving voice signals from the server; a key module for sending call signals to the server; an MCU control module connected with the voice receiving module and the key module respectively; The MCU control module controls the key module to send call signals.

2. The intercom system of claim 1, wherein, The MCU control module comprises an MCU chip IC3 connected with the voice receiving module and the key module respectively.

3. The intercom system of claim 2, wherein, The key module comprises a PTT key and a call signal transmitting unit, and the MCU chip IC3 is connected with the PTT key and the call signal transmitting unit respectively.

4. The intercom system of claim 2, wherein, The voice receiving module comprises an antenna, a low-pass filter unit, a TXRX switching unit, a high-frequency amplification unit, a baseband processing unit, a noise reduction switching unit, a noise reduction unit and a loudspeaker unit connected in sequence; The MCU chip IC3 is connected with the low-pass filter unit, the TXRX switching unit, the high-frequency amplification unit, the baseband processing unit, the noise reduction switching unit, the noise reduction unit and the loudspeaker unit respectively.

5. The intercom system of claim 4, wherein, The baseband processing unit comprises a baseband chip IC4 connected with the MCU chip IC3 through SDA4839 signal, SCN4839 signal and SCK4839 signal.

6. The intercom system of claim 5, wherein, The noise reduction switching unit comprises a first signal switch U3, a second signal switch U4 and a third signal switch U5, the first signal switch U3 is connected with the second signal switch U4, and the third signal switch U5 is connected with the second signal switch U4; The third signal switch U5 is connected with the loudspeaker unit through an AF OUT signal.

7. The intercom system of claim 6, wherein The noise reduction unit comprises a noise reduction chip IC8 connected with the third signal switch U5 through an NRIN signal, and connected with the first signal switch U3 through an NRIN signal, an NROUT signal and a PNC_POW signal.

8. The intercom system of claim 5, wherein, The low-pass filter unit comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C5, a capacitor C6, a capacitor C13 and a capacitor C15; The inductor L1, the inductor L2, the inductor L3, the inductor L4 and the C15 are connected in series, The capacitor C5 is connected with the inductor L2 in parallel, the capacitor C6 is connected with the inductor L3 in parallel, and the capacitor C13 is connected with the inductor L4 in parallel.

9. The intercom system of claim 5, wherein, The TXRX switching unit comprises a transistor Q11 and a transistor Q2, the base of the transistor Q11 is connected with the MCU chip IC3 through a TX-P signal, and the base of the transistor Q2 is connected with the baseband chip IC4 through an RX-P signal.

10. The intercom system of claim 9, wherein, The high-frequency amplification unit comprises a transistor Q6, the collector of the transistor Q6 is connected with the collector of the transistor Q2, and the collector of the transistor Q6 is connected with the baseband chip IC4 through an RFIN signal.

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