Intelligent ordering system for catering

Abstract

The utility model provides an intelligent ordering system for catering, and belongs to the technical field of intelligent ordering. The intelligent ordering system for catering comprises a display module, a voice receiving module, a laser detection module, a timing module, a control module, a wireless communication module and a power supply module, the power supply module is configured to provide a working power supply for the display module, the voice receiving module, the laser detection module, the timing module, the control module and the wireless communication module; the display module, the voice receiving module, the laser detection module and the timing module are all connected with the control module, and the control module is in communication connection with the kitchen terminal and the foreground terminal through the wireless communication module; the laser detection module is configured to detect customers, the voice receiving module is configured to receive voice signals of the customers, the display module is configured to display ordering information of the customers, and the timing module is configured to time ordering time of the customers. The customer satisfaction can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of intelligent ordering, and particularly relates to a restaurant intelligent ordering system. BACKGROUND

[0002] In today's fast-paced restaurant consumption market, the traditional ordering method has exposed many drawbacks. When customers enter the restaurant, they often spend a lot of time flipping through paper menus, which are not only easily damaged and stained, affecting the presentation of the dishes, but also inefficient in manually checking the dishes. During the peak dining period, the ordering process is lengthy, which can easily cause customers to feel frustrated. At the same time, the waiter manually records the ordering information and then passes it to the kitchen, which is a tedious process and is prone to errors, resulting in delayed service or mismatched dishes, reducing customer satisfaction. CONTENT OF THE UTILITY MODEL

[0003] The present disclosure provides a restaurant intelligent ordering system to improve customer satisfaction.

[0004] The present disclosure provides a restaurant intelligent ordering system, which includes a display module, a voice receiving module, a laser detection module, a timing module, a control module, a wireless communication module, and a power module.

[0005] The power module is configured to provide working power to the display module, the voice receiving module, the laser detection module, the timing module, the control module, and the wireless communication module.

[0006] The display module, the voice receiving module, the laser detection module, and the timing module are all connected to the control module, and the control module is communicatively connected to the kitchen terminal and the front desk terminal through the wireless communication module.

[0007] The laser detection module is configured to detect customers, the voice receiving module is configured to receive voice signals from customers, the display module is configured to display customers' ordering information, and the timing module is configured to time customers' ordering time.

[0008] In an exemplary embodiment of the present disclosure, a power control module is further included.

[0009] The first end of the power control module is connected to the power module, the second end of the power control module is connected to the power supply ends of the display module, the voice receiving module, and the timing module, and the control end of the power control module is connected to the control module.

[0010] The power supply end of the laser detection module is connected to the power module.

[0011] In an example embodiment of the present disclosure, the power control module comprises a transistor Q1, a resistor R2, a switch tube Q2 and a rheostat RP1;

[0012] The base of the transistor Q1 is connected to the control module, the collector of the transistor Q1 is connected to the control end of the switch tube Q2 through the resistor R2, and the emitter of the transistor Q1 is grounded.

[0013] The first end of the switch tube Q2 is connected to a power supply, the second end of the switch tube Q2 is connected to the first end of the rheostat RP1, the second end of the rheostat RP1 is grounded, the sliding end of the rheostat RP1 is connected to the control end of the switch tube Q2, and the second end of the switch tube Q2 is connected to the power supply ends of the display module, the voice receiving module and the timing module respectively.

[0014] In an example embodiment of the present disclosure, the voice receiving module comprises a microphone, an isolation amplification circuit, a band-pass filter circuit and an A / D conversion module.

[0015] The microphone is used to receive the voice signal of a customer, the input end of the isolation amplification circuit is connected to the microphone, the output end of the isolation amplification circuit is connected to the input end of the band-pass filter circuit, the output end of the band-pass filter circuit is connected to the input end of the A / D conversion module, and the output end of the A / D conversion module is connected to the control module.

[0016] In an example embodiment of the present disclosure, the isolation amplification circuit comprises an isolation circuit and an adaptive amplification circuit.

[0017] The input end of the isolation circuit is connected to the microphone, the output end of the isolation circuit is connected to the input end of the adaptive amplification circuit, and the output end of the adaptive amplification circuit is connected to the input end of the band-pass filter circuit.

[0018] The adaptive amplification circuit comprises an amplification circuit and a gain adjustment circuit.

[0019] The input end of the amplification circuit is connected to the output end of the isolation circuit, the output end of the amplification circuit is connected to the input end of the amplification circuit through the gain adjustment circuit, and the output end of the amplification circuit is connected to the input end of the band-pass filter circuit.

[0020] In an example embodiment of the present disclosure, the isolation circuit comprises a transformer T1.

[0021] The first input end of the transformer T1 is connected with the first end of the pickup, the second input end of the transformer T1 is connected with the second end of the pickup, the first output end of the transformer T1 is connected with the input end of the amplification circuit, and the second output end of the transformer T1 is grounded.

[0022] In an exemplary embodiment of the present disclosure, the amplification circuit comprises an operational amplifier U1, a resistor R3, a resistor R4 and a capacitor C3.

[0023] The non-inverting input end of the operational amplifier U1 is connected with the output end of the isolation circuit, the inverting input end of the operational amplifier U1 is grounded through the resistor R3, the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through the resistor R4, the capacitor C3 is connected with the resistor R4 in parallel, and the output end of the operational amplifier U1 is connected with the input end of the gain adjustment circuit.

[0024] In an exemplary embodiment of the present disclosure, the gain adjustment circuit comprises a resistor R5, a resistor R6, an operational amplifier U2, a resistor R7, a transistor Q3, a diode D1, an operational amplifier U3, a resistor R11, a resistor R9 and a resistor R8.

[0025] The first end of the resistor R5 is connected with the output end of the amplification circuit, the second end of the resistor R5 is connected with the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is grounded through the resistor R6, the output end of the operational amplifier U2 is connected with the non-inverting input end of the operational amplifier U2 through the resistor R7, the output end of the operational amplifier U2 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the inverting input end of the operational amplifier U3 through the resistor R11, the inverting input end of the operational amplifier U3 is grounded through the resistor R9, the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U3 through the resistor R8, and the output end of the operational amplifier U3 is connected with the control end of the transistor Q3.

[0026] The first end of the transistor Q3 is connected with the input end of the amplification circuit, and the second end of the transistor Q3 is connected with the non-inverting input end of the operational amplifier U2.

[0027] The beneficial effects of the intelligent catering ordering system provided by the embodiments of the present disclosure are as follows: the embodiments of the present disclosure accurately identify the customer seating state through the laser detection module, automatically start the ordering process, and greatly improve the service response speed. The introduction of the voice receiving module enables customers to easily complete dish selection through voice instructions without tedious manual operation, which is convenient and efficient. At the same time, the display module displays the ordering information in real time, enhancing the transparency and interactivity of the ordering process. The timing module effectively monitors the ordering time, and for the case of overtime without ordering, the system can automatically notify the front desk terminal so that the service personnel can intervene in time to optimize the customer experience. In addition, the wireless communication module ensures the rapid transmission of ordering information between the kitchen terminal and the front desk terminal, improving the collaborative efficiency of kitchen cooking and front desk service. The embodiments of the present disclosure simplify the ordering process, improve the intelligent level of catering service and customer satisfaction. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a structural schematic diagram of the intelligent catering ordering system provided by the embodiments of the present disclosure;

[0030] Figure 2 is a structural schematic diagram of the voice receiving module provided by the embodiments of the present disclosure;

[0031] Figure 3 is a circuit diagram of the power control module provided by the embodiments of the present disclosure;

[0032] Figure 4 is a circuit diagram of the intelligent catering ordering system provided by the embodiments of the present disclosure. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described below in conjunction with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only some of the embodiments of the present scheme, not all. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present scheme.

[0034] The terms "comprise", "comprising", "include", "including", "contain", "containing", "have", "having", "establish", "establishing", "provide", "providing" and any variations thereof in the Specification and Claims of this document, as well as the terms "first", "second", and the like, refer to "comprising but not limited to", and are intended to cover the meanings of "consist of" and "consisting of".

[0035] The implementation of the present disclosure is described in detail below in combination with specific drawings:

[0036] Figure 1 A structural schematic diagram of a restaurant intelligent ordering system is provided for the embodiments of the present disclosure. Referring to Figure 1 , the restaurant intelligent ordering system comprises a display module, a voice receiving module, a laser detection module, a timing module, a control module, a wireless communication module and a power module; the power module is configured to provide working power for the display module, the voice receiving module, the laser detection module, the timing module, the control module and the wireless communication module; the display module, the voice receiving module, the laser detection module and the timing module are connected with the control module, and the control module is in communication connection with the kitchen terminal and the front desk terminal through the wireless communication module; the laser detection module is configured to detect customers, the voice receiving module is configured to receive the voice signal of the customers, the display module is configured to display the ordering information of the customers, and the timing module is configured to time the ordering time of the customers.

[0037] In the present embodiment, the power module is used to provide working power for the display module, the voice receiving module, the laser detection module, the timing module, the control module and the wireless communication module, so as to ensure that each module can operate normally.

[0038] The laser detection module is arranged below the table top and detects whether a customer comes to dine through the laser ranging principle. When a customer sits at the corresponding table position, the human body affects the propagation of laser, and the laser detection module judges that a customer is seated accordingly and then sends a corresponding detection signal to the control module.

[0039] When the customer prepares to order at the table, the customer can order through voice, and the voice receiving module is used to receive the voice signal of the customer. After the customer speaks the voice content of ordering dishes, the voice receiving module converts the received voice signal into a digital signal that can be processed by the system through its voice recognition technology, and then transmits the signal to the control module.

[0040] The display module can display all the menu information provided by the restaurant in the initial state, such as dish name, picture, price, feature introduction, etc., to facilitate customers to fully understand the range of available dishes. When the customer selects a specific dish through voice or other means, the display module can update the interface in real time, list the selected dishes, and display the total price and other related information of the selected dishes, so that the customer can intuitively check the details of the order to ensure accurate ordering.

[0041] After receiving the customer's order information, the control module can send the information through the wireless communication module. The wireless communication module can accurately transmit the customer's order content to the kitchen terminal based on the wireless network environment built by the restaurant, such as the common Wi-Fi network. After the kitchen staff sees the dish information presented on the kitchen terminal, they can prepare the ingredients and cook according to the corresponding requirements to ensure that the dishes can be prepared in time. At the same time, the order information can be sent to the front desk terminal to facilitate the front desk staff to check and verify.

[0042] The timing module starts timing as soon as the laser detection module detects that the customer is seated. It continues to record the time during the entire ordering process. Once the set time is reached and the customer has not completed the ordering action, the timing module will send specific information to the front desk terminal through the wireless communication module. After receiving the information, the front desk staff can know the customer's ordering situation at the corresponding table and promptly go to the table to ask if the customer needs help, such as helping to introduce dishes, answering system usage questions, etc., to ensure that the customer can complete the ordering smoothly, and also improve the overall service efficiency of the restaurant and the dining experience of the customer.

[0043] For example, assume that Li and his family come to a restaurant that has installed an intelligent ordering system. As soon as they sit down at the table, the laser detection module under the table detects that someone is seated and immediately sends a signal to the control module, and the timing module starts simultaneously.

[0044] Li and his family see the display module light up, which displays various dishes in the restaurant. When they are ready to order, Li says to the voice receiving module, "I want a roasted duck and a stir-fried vegetable." The voice receiving module quickly recognizes and converts the instruction and transmits it to the control module. After processing by the control module, the display module updates in real time and clearly presents the selected dishes and total price.

[0045] At the same time, the control module sends the order information to the kitchen terminal and the front desk terminal through the wireless communication module via the restaurant's Wi-Fi. The kitchen staff sees the order and immediately starts preparing the roasted duck and vegetables. The front desk staff also receives the information for record.

[0046] From the above, it can be concluded that the embodiment accurately identifies the customer seating state through the laser detection module, automatically starts the ordering process, and greatly improves the service response speed. The introduction of the voice receiving module enables customers to easily complete dish selection through voice instructions without tedious manual operations, which is convenient and efficient. At the same time, the display module displays the ordering information in real time, enhancing the transparency and interactivity of the ordering process. The timing module effectively monitors the ordering time, and for the case of overtime without ordering, the system can automatically notify the front desk terminal so that the service personnel can intervene in time to optimize the customer experience. In addition, the wireless communication module ensures the rapid transmission of ordering information between the kitchen terminal and the front desk terminal, improving the collaborative efficiency of kitchen cooking and front desk service. The embodiment simplifies the ordering process, improves the intelligent level of catering service and customer satisfaction.

[0047] As shown in Figure 1 In an embodiment of the present disclosure, a power control module is further included. The first end of the power control module is connected to the power module, the second end of the power control module is connected to the power supply end of the display module, the voice receiving module and the timing module respectively, and the control end of the power control module is connected to the control module. The power supply end of the laser detection module is connected to the power module.

[0048] In the embodiment, the laser detection module is directly connected to the power supply, and the laser detection module is in a continuous working state. When a customer sits at the corresponding table position, the electrical signal output by the laser detection module changes, and when the main control module receives this change signal, it sends a control instruction to the power control module, thereby connecting the power supply of the display module, the voice receiving module and the timing module, and making them enter the working state.

[0049] When there is no customer, the display module, the voice receiving module and the timing module are in a closed state due to no power supply, thereby avoiding unnecessary power consumption. This intelligent power control mechanism not only ensures the timely response of the ordering system to the customer dining state, but also reduces the operating cost of the restaurant through energy saving, greatly improving the practicality and economy of the system.

[0050] From the above, when the laser detection module detects that a customer is seated, the change of the electrical signal prompts the main control module to start the power control module, and the power supply of the display, voice receiving and timing modules is connected, providing convenient and efficient ordering service for customers and responding to customer needs in time. When there is no customer, these modules are closed, effectively saving power. This not only improves the customer dining experience, but also reduces the operating cost of the restaurant, realizing the rational use of resources.

[0051] As shown in Figure 3As shown, in one embodiment of this disclosure, the power control module includes: a transistor Q1, a resistor R2, a switching transistor Q2, and a variable resistor RP1; the base of transistor Q1 is connected to the control module, the collector of transistor Q1 is connected to the control terminal of switching transistor Q2 through resistor R2, and the emitter of transistor Q1 is grounded; the first terminal of switching transistor Q2 is connected to the power supply, the second terminal of switching transistor Q2 is connected to the first terminal of variable resistor RP1, the second terminal of variable resistor RP1 is grounded, the sliding terminal of variable resistor RP1 is connected to the control terminal of switching transistor Q2, and the second terminal of switching transistor Q2 is connected to the power supply terminals of the display module, the voice receiving module, and the timing module, respectively.

[0052] In this embodiment, when the laser detection module detects a customer sitting at the table, its output electrical signal changes. Upon receiving this signal, the main control module sends a high-level control command to the base of transistor Q1. At this time, transistor Q1 turns on, and the collector current flows through resistor R2 to the control terminal of switch Q2, providing drive current for switch Q2. Since the first terminal of switch Q2 is connected to the power supply, under the action of the drive current, switch Q2 turns on, allowing the power supply to be connected to rheostat RP1. Rheostat RP1 acts as a voltage divider, and its sliding end is fed back to the control terminal of switch Q2, forming a stable control loop. This precisely adjusts the output voltage, ensuring that the connected display module, voice receiving module, and timing module receive a stable and suitable power supply, enabling them to enter normal working condition and achieving intelligent on-demand power distribution. When there are no customers, the main control module does not send commands to transistor Q1, and the relevant modules receive no power, achieving energy saving.

[0053] like Figure 2 As shown, in one embodiment of this disclosure, the voice receiving module includes: a microphone, an isolation amplifier circuit, a bandpass filter circuit, and an A / D conversion module; the microphone is used to receive the customer's voice signal, the input terminal of the isolation amplifier circuit is connected to the microphone, the output terminal of the isolation amplifier circuit is connected to the input terminal of the bandpass filter circuit, the output terminal of the bandpass filter circuit is connected to the input terminal of the A / D conversion module, and the output terminal of the A / D conversion module is connected to the control module.

[0054] In this embodiment, the microphone is used to receive the customer's voice signal and convert it into a corresponding electrical signal output. Since the electrical signal output by the microphone is often relatively weak, the isolation amplifier circuit can amplify the electrical signal output by the microphone, increasing the signal amplitude to meet the requirements of further processing by subsequent circuits. On the other hand, the isolation amplifier circuit can also act as an isolation circuit, avoiding external interference signals and potential mutual influence between upstream and downstream circuits, thus ensuring the stability and purity of signal transmission.

[0055] The amplified signal is transmitted to a band-pass filter circuit. The band-pass filter circuit can filter out components within the effective frequency range of the voice signal, filter out noise and other useless interference signals that do not belong to the voice frequency band, and further purify the signal, so that the final transmitted signal is as much as possible the effective content related to the customer's voice.

[0056] The filtered analog voice signal enters an A / D conversion module. The A / D conversion module can convert the analog signal into a digital signal according to a certain sampling frequency and quantization accuracy, so as to facilitate subsequent control module identification, and then realize accurate conversion of the customer's voice instruction into system executable operation information, and complete voice ordering and other related functions.

[0057] In an embodiment of the present disclosure, the isolation amplification circuit comprises an isolation circuit and an adaptive amplification circuit; the input end of the isolation circuit is connected to the sound pickup, the output end of the isolation circuit is connected to the input end of the adaptive amplification circuit, and the output end of the adaptive amplification circuit is connected to the input end of the band-pass filter circuit; the adaptive amplification circuit comprises an amplification circuit and a gain adjustment circuit; the input end of the amplification circuit is connected to the output end of the isolation circuit, the output end of the amplification circuit is connected to the input end of the amplification circuit through the gain adjustment circuit, and the output end of the amplification circuit is connected to the input end of the band-pass filter circuit.

[0058] In the present embodiment, the isolation circuit is connected to the sound pickup, which mainly prevents external interference signals from affecting the subsequent circuit, and also avoids feedback of signals in the subsequent circuit to the sound pickup end. Because in the actual restaurant environment, there may be various electromagnetic interference sources, such as electromagnetic noise generated by other electronic devices, kitchen appliances, etc. The isolation circuit provides a relatively pure signal basis for subsequent amplification and filtering operations through physical isolation or electrical isolation (for example, using optical couplers, transformer isolation, etc.).

[0059] The adaptive amplification circuit is composed of an amplification circuit and a gain adjustment circuit, and the amplification circuit receives the weak voice signal output from the isolation circuit and performs preliminary amplification. Because the signal amplitude output by the sound pickup is small and insufficient for effective processing by the subsequent band-pass filter circuit and A / D conversion module, the amplification circuit is needed to enhance the signal strength. The amplification circuit is generally composed of operational amplifiers and other active devices, and the input weak voice signal is amplified to an appropriate amplitude range by reasonably setting the amplification factor.

[0060] The gain adjustment circuit connects to the input and output terminals of the amplifier circuit, forming a feedback loop. Its purpose is to automatically adjust the amplifier circuit's gain based on the strength of the input signal. In actual voice reception, the volume of a customer's voice may vary. When the input signal is weak, the gain adjustment circuit increases the amplifier circuit's gain to ensure the output signal reaches a suitable amplitude; conversely, when the input signal is strong, the gain adjustment circuit decreases the amplifier circuit's gain to prevent excessive output signal amplitude and distortion. This ensures that regardless of the customer's voice volume, the signal amplitude output by the adaptive amplifier circuit remains within a relatively stable range, which is beneficial for the subsequent bandpass filter circuit and A / D conversion module. The signal, after isolation and adaptive amplification, is then transmitted to the bandpass filter circuit.

[0061] like Figure 4 As shown, in one embodiment of this disclosure, the isolation circuit includes a transformer T1; the first input terminal of the transformer T1 is connected to the first terminal of the microphone, the second input terminal of the transformer T1 is connected to the second terminal of the microphone, the first output terminal of the transformer T1 is connected to the input terminal of the amplifier circuit, and the second output terminal of the transformer T1 is grounded.

[0062] In this embodiment, when the microphone receives the customer's voice signal and converts it into an electrical signal, the electrical signal is transmitted to the two input terminals of the transformer T1 through the two ends of the microphone.

[0063] Transformers operate based on the principle of electromagnetic induction. The input voice signal generates an alternating magnetic field in the primary winding of transformer T1. Due to electromagnetic induction, this alternating magnetic field induces an electromotive force in the secondary winding of transformer T1, thus transmitting the signal from the primary side to the secondary side.

[0064] As can be seen from the above, this embodiment transmits signals via magnetic field coupling, making the primary and secondary windings electrically isolated. In other words, electrical interference on the primary side, such as common-mode noise (interference signals appearing simultaneously at both the positive and negative poles of the signal), is difficult to transmit to the secondary side through the transformer's magnetic coupling. This is because the transformer primarily transmits a changing magnetic field, and interference signals such as common-mode noise, under ideal conditions, will not generate effective magnetic field changes to affect the secondary winding.

[0065] like Figure 4 As shown, in one embodiment of this disclosure, the amplifier circuit includes: operational amplifier U1, resistor R3, resistor R4, and capacitor C3; the non-inverting input terminal of operational amplifier U1 is connected to the output terminal of the isolation circuit, the inverting input terminal of operational amplifier U1 is grounded through resistor R3, the output terminal of operational amplifier U1 is connected to the inverting input terminal of operational amplifier U1 through resistor R4, capacitor C3 is connected in parallel with resistor R4, and the output terminal of operational amplifier U1 is connected to the input terminal of the gain adjustment circuit.

[0066] In this embodiment, operational amplifier U1 constitutes a non-inverting amplifier circuit. When the voice signal output from the isolation circuit is transmitted to the non-inverting input terminal of operational amplifier U1, the signal will be amplified internally according to the working principle of the operational amplifier.

[0067] Capacitor C3 acts as a filter. In amplifier circuits, high-frequency noise may be introduced due to factors such as the bandwidth of the operational amplifier. Capacitor C3 has low impedance characteristics for high-frequency signals, which can bypass high-frequency noise to ground, thereby reducing high-frequency interference components in the output signal. This makes the amplified speech signal cleaner and improves signal quality.

[0068] like Figure 4 As shown, in one embodiment of this disclosure, the gain adjustment circuit includes: resistor R5, resistor R6, operational amplifier U2, resistor R7, transistor Q3, diode D1, operational amplifier U3, resistor R11, resistor R9, and resistor R8; the first end of resistor R5 is connected to the output terminal of the amplifier circuit, the second end of resistor R5 is connected to the non-inverting input terminal of operational amplifier U2, the inverting input terminal of operational amplifier U2 is grounded through resistor R6, the output terminal of operational amplifier U2 is connected to the non-inverting input terminal of operational amplifier U2 through resistor R7, the output terminal of operational amplifier U2 is connected to the anode of diode D1, the cathode of diode D1 is connected to the inverting input terminal of operational amplifier U3 through resistor R11, the inverting input terminal of operational amplifier U3 is grounded through resistor R9, the output terminal of operational amplifier U3 is connected to the inverting input terminal of operational amplifier U3 through resistor R8, and the output terminal of operational amplifier U3 is connected to the control terminal of transistor Q3; the first end of transistor Q3 is connected to the input terminal of the amplifier circuit, and the second end of transistor Q3 is connected to the non-inverting input terminal of operational amplifier U2.

[0069] In this embodiment, operational amplifier U2, resistors R6 and R7 together form a positive feedback circuit. This circuit enhances certain characteristics of the signal or adjusts its initial state to better facilitate subsequent gain-related operations. After processing by the circuit consisting of operational amplifier U2 and its associated resistors, the signal is output from the output terminal of operational amplifier U2.

[0070] The signal output from operational amplifier U2 is transmitted to the anode of diode D1. Diode D1 has unidirectional conductivity and functions as a half-wave rectifier. This converts the alternating signal into a signal containing only the positive component, outputting a DC voltage signal proportional to the amplitude of the input signal. This provides a measurable DC component as a basis for subsequent gain adjustment based on signal amplitude.

[0071] The direct current voltage signal rectified by the diode D1 is transmitted to the inverting input terminal of the operational amplifier U3 through the resistor R11. The operational amplifier U3 performs stable inverting amplification operation on the input direct current voltage signal. The amplified direct current voltage signal output by the operational amplifier U3, that is, the automatic gain control voltage, will be the key control signal for controlling the transistor Q3 and will be output from the output terminal of the operational amplifier U3.

[0072] When the input signal amplitude increases, the control voltage acting on the control terminal of the transistor Q3 increases through the previous rectification, inverting amplification and other processes, so that the equivalent voltage-controlled resistance value of the transistor Q3 increases. With the increase of the voltage-controlled resistance value, the amplification factor Av of the operational amplifier U2 decreases, thereby achieving the purpose of automatic gain control. Conversely, when the input signal amplitude is small, the control voltage decreases through the action of each link, the voltage-controlled resistance value decreases, and the amplification factor of the operational amplifier U2 will increase accordingly, so as to ensure that the output signal amplitude can be maintained in a relatively appropriate and stable range, thereby meeting the requirements of the subsequent circuit for the signal.

[0073] Among them, the resistor R10 and the capacitor C4 constitute a filter circuit, so that the direct current signal output by the diode D1 is more stable.

[0074] The above examples are only used to illustrate the technical solutions of the present disclosure, but not to limit it; although the present disclosure has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A restaurant intelligent ordering system, characterized in that, The application relates to a voice-activated laser detection system for a restaurant, which comprises a display module, a voice receiving module, a laser detection module, a timing module, a control module, a wireless communication module and a power module. The power module is configured to provide working power for the display module, the voice receiving module, the laser detection module, the timing module, the control module and the wireless communication module. The display module, the voice receiving module, the laser detection module and the timing module are connected with the control module, and the control module is in communication connection with a back kitchen terminal and a front desk terminal through the wireless communication module. The laser detection module is configured to detect customers, the voice receiving module is configured to receive voice signals of the customers, the display module is configured to order information of the customers, and the timing module is configured to time the order time of the customers. The application further relates to a power control module.

2. The intelligent ordering system of claim 1, wherein, A first end of the power control module is connected with the power module, a second end of the power control module is connected with power supply ends of the display module, the voice receiving module and the timing module, and a control end of the power control module is connected with the control module. A power supply end of the laser detection module is connected with the power module. The power control module comprises a triode Q1, a resistor R2, a switch tube Q2 and a variable resistor RP1. A base of the triode Q1 is connected with the control module, a collector of the triode Q1 is connected with a control end of the switch tube Q2 through the resistor R2, and an emitter of the triode Q1 is grounded.

3. The intelligent ordering system of claim 2, wherein, A first end of the switch tube Q2 is connected with a power supply, a second end of the switch tube Q2 is connected with a first end of the variable resistor RP1, a second end of the variable resistor RP1 is grounded, a sliding end of the variable resistor RP1 is connected with the control end of the switch tube Q2, and the second end of the switch tube Q2 is connected with power supply ends of the display module, the voice receiving module and the timing module. The voice receiving module comprises a sound pickup, an isolation amplification circuit, a band-pass filter circuit and an A / D conversion module. The sound pickup is used for receiving voice signals of customers, an input end of the isolation amplification circuit is connected with the sound pickup, an output end of the isolation amplification circuit is connected with an input end of the band-pass filter circuit, an output end of the band-pass filter circuit is connected with an input end of the A / D conversion module, and an output end of the A / D conversion module is connected with the control module.

4. The intelligent ordering system of claim 1, wherein, The isolation amplification circuit comprises an isolation circuit and an adaptive amplification circuit. An input end of the isolation circuit is connected with the sound pickup, an output end of the isolation circuit is connected with an input end of the adaptive amplification circuit, and an output end of the adaptive amplification circuit is connected with an input end of the band-pass filter circuit.

5. The intelligent ordering system of claim 4, wherein, The adaptive amplification circuit comprises an amplification circuit and a gain adjustment circuit. An input end of the amplification circuit is connected with an output end of the isolation circuit, an output end of the amplification circuit is connected with an input end of the amplification circuit through the gain adjustment circuit, and the output end of the amplification circuit is connected with an input end of the band-pass filter circuit. The isolation circuit comprises a transformer T1. ​ 6. The intelligent ordering system of claim 5, wherein, ​ The first input end of the transformer T1 is connected with the first end of the pickup, the second input end of the transformer T1 is connected with the second end of the pickup, the first output end of the transformer T1 is connected with the input end of the amplification circuit, and the second output end of the transformer T1 is grounded.

7. The intelligent ordering system of claim 5, wherein, The amplification circuit comprises an operational amplifier U1, a resistor R3, a resistor R4 and a capacitor C3. The non-inverting input end of the operational amplifier U1 is connected with the output end of the isolation circuit, the inverting input end of the operational amplifier U1 is grounded through the resistor R3, the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through the resistor R4, the capacitor C3 is connected with the resistor R4 in parallel, and the output end of the operational amplifier U1 is connected with the input end of the gain adjustment circuit.

8. The intelligent ordering system of claim 5, wherein, The gain adjustment circuit comprises a resistor R5, a resistor R6, an operational amplifier U2, a resistor R7, a transistor Q3, a diode D1, an operational amplifier U3, a resistor R11, a resistor R9 and a resistor R8. The first end of the resistor R5 is connected with the output end of the amplification circuit, the second end of the resistor R5 is connected with the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is grounded through the resistor R6, the output end of the operational amplifier U2 is connected with the non-inverting input end of the operational amplifier U2 through the resistor R7, the output end of the operational amplifier U2 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the inverting input end of the operational amplifier U3 through the resistor R11, the inverting input end of the operational amplifier U3 is grounded through the resistor R9, the output end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U3 through the resistor R8, and the output end of the operational amplifier U3 is connected with the control end of the transistor Q3. The first end of the transistor Q3 is connected with the input end of the amplification circuit, and the second end of the transistor Q3 is connected with the non-inverting input end of the operational amplifier U2.

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