An alarm device and method for a dual-speaker face recognition terminal

Abstract

The embodiment of the present invention discloses an alarm device for a dual-speaker face-scanning terminal, comprising: a multimedia CPU, a security CPU, a first speaker, and a second speaker; the security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier; the multimedia CPU is connected to the second speaker via a second audio power amplifier; the control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier via a first diode; the control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier via a second diode. The alarm device and method for a dual-speaker face-scanning terminal provided by the present invention use one of the dual speakers to output an alarm audio when a security mechanism is triggered, the alarm volume is large, and the design difficulty and manufacturing cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of intelligent devices, and in particular to an alarm device and method for a dual-speaker face-scanning terminal. Background Art

[0002] In the prior art, face-scanning terminals with physical security mechanisms use a dual CPU design, i.e., a security CPU + multimedia CPU design, to ensure the security of terminal data. Accordingly, the face-scanning terminal with a dual speaker design and a physical security mechanism uses a buzzer plus two speakers for its audio output part; one buzzer is only controlled by the security CPU, and is used to output the alarm audio when the security mechanism is triggered. The pulse signal output by the security CPU is amplified to drive the buzzer to emit a certain frequency of sound, such as the sound of "beep. beep. beep..."; the two speakers are controlled by the multimedia CPU of the face-scanning terminal, and are used to broadcast voice prompt information during financial transaction operations.

[0003] Since the alarm volume is limited by the specifications of the buzzer, the audio alarm sound is relatively small, approximately 70 to 80 dB. In addition, the use of three electroacoustic components - a buzzer and two speakers - in a terminal product makes the structural design more complex, the number of openings in the electroacoustic device increases, and the assembly process and difficulty are increased, resulting in a higher cost for the entire machine. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an alarm device and method for a dual-speaker face recognition terminal, in which one of the dual speakers is used to output an alarm audio when a safety switch is triggered. The alarm volume is large and the design difficulty and production cost can be reduced.

[0005] In a first aspect, the present invention provides an alarm device for a dual-speaker face recognition terminal, comprising:

[0006] Multimedia CPU, security CPU, first speaker and second speaker;

[0007] The security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier;

[0008] The multimedia CPU is connected to the second speaker via a second audio power amplifier;

[0009] The control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode;

[0010] The control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode;

[0011] The security CPU is connected to the security switch of the face recognition terminal.

[0012] Preferably, the security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier, which is further specifically as follows:

[0013] The alarm audio signal output pin of the security CPU is connected to one end of a first capacitor, the other end of the first capacitor is connected to a signal input pin of the first audio power amplifier through a first resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker;

[0014] The working audio signal output pin of the multimedia CPU is connected to one end of the second capacitor, the other end of the second capacitor is connected to the signal input pin of the first audio power amplifier through the second resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker.

[0015] Furthermore, when the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low, the alarm audio signal output pin of the security CPU is low, the control signal output pin of the multimedia CPU is high, the working audio signal output pin of the multimedia CPU outputs a working audio signal, the working audio signal is input to the audio input pin of the first audio power amplifier, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset on the multimedia CPU, the control signal output pin of the security CPU is high, the alarm audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low, and the working audio signal output pin of the multimedia CPU is low; the first speaker obtains the alarm audio signal from the security CPU.

[0016] Preferably, the control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode, which is further specifically as follows:

[0017] The control signal output pin of the safety CPU is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the switch enable signal pin of the audio power amplifier and the fourth resistor, and the other end of the fourth resistor is grounded;

[0018] Preferably, the control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode, which is further specifically as follows:

[0019] The control signal output pin of the multimedia CPU is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the third resistor, and is connected to the switch enable signal pin of the frequency power amplifier through the third resistor.

[0020] In a second aspect, the present invention further provides an alarm method for a dual-speaker face recognition terminal, which requires providing the device described in the first aspect, and the method comprises:

[0021] Multimedia CPU, used to output working audio signals;

[0022] A security CPU, used for forcibly resetting the multimedia CPU and outputting an alarm audio signal when the security switch of the face recognition terminal is triggered;

[0023] When the face recognition terminal security switch is not triggered:

[0024] The first speaker and the second speaker acquire and play the working audio signal from the multimedia CPU; and

[0025] When the face recognition terminal security switch is triggered:

[0026] The first speaker obtains and plays the alarm audio signal from the security CPU.

[0027] Furthermore, when the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low level, the alarm audio signal output pin of the security CPU is low level, the control signal output pin of the multimedia CPU is high level, the audio signal output pin of the multimedia CPU outputs a working audio signal, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset on the multimedia CPU, the control signal output pin of the security CPU is high level, the audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low level, and the working audio signal output pin of the multimedia CPU is low level; the first speaker obtains the alarm audio signal from the security CPU.

[0028] The present invention has the following advantages:

[0029] One of the speakers of the dual-speaker face-scanning terminal is used to replace the buzzer electroacoustic device. The single speaker replacing the buzzer is controlled by the security CPU and the multimedia CPU. When the safety switch of the face-scanning terminal is not triggered, the speaker obtains and plays the working audio signal from the multimedia CPU; when the safety switch of the face-scanning terminal is triggered, the speaker obtains and plays the alarm audio signal from the security CPU. Since the upper limit of the speaker's volume is larger than that of the buzzer, it can usually reach 100dB. This method increases the volume of the alarm while reducing the structural design difficulty of the dual-speaker face-scanning terminal. By reducing the electroacoustic components, the sound outlet holes are correspondingly reduced, thereby reducing the design difficulty and manufacturing cost of the face-scanning terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0031] Figure 1 A schematic diagram of an audio control architecture according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the switching principle of an audio power amplifier according to an embodiment of the present invention;

[0033] Figure 3 Schematic diagram of the working process of the first speaker according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the voice broadcast process when the safety switch is not triggered in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the working process after the safety switch is triggered according to an embodiment of the present invention;

[0036] Figure 6 Schematic diagram of the circuit structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Embodiment 1

[0038] Please refer to Figure 1 The embodiment of the present invention provides an alarm device for a dual-speaker face recognition terminal, comprising:

[0039] Multimedia CPU, security CPU, first speaker and second speaker;

[0040] The security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier;

[0041] The multimedia CPU is connected to the second speaker via a second audio power amplifier;

[0042] The control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode;

[0043] The control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode;

[0044] The security CPU is connected to the security switch of the face recognition terminal.

[0045] When the security switch of the face recognition terminal is not triggered, the face recognition terminal works normally, and the first speaker and the second speaker obtain and play the working audio signal from the multimedia CPU; when the security switch is triggered, the first speaker is used instead of the buzzer to output the alarm audio when the security switch is triggered. The alarm volume is loud and can reduce the design difficulty and production cost of the face recognition terminal; by connecting the first diode and the second diode respectively, the control signal of the security CPU and the control signal of the multimedia CPU are prevented from being input into each other, causing level interference.

[0046] In a possible implementation, the security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier, which is further specifically as follows:

[0047] The alarm audio signal output pin of the security CPU is connected to one end of a first capacitor, the other end of the first capacitor is connected to a signal input pin of the first audio power amplifier through a first resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker;

[0048] The working audio signal output pin of the multimedia CPU is connected to one end of a second capacitor, the other end of the second capacitor is connected to a signal input pin of a first audio power amplifier through a second resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker;

[0049] In a possible implementation, when the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low, the alarm audio signal output pin of the security CPU is low, the control signal output pin of the multimedia CPU is high, the working audio signal output pin of the multimedia CPU outputs a working audio signal, and the working audio signal is input to the audio input pin of the first audio power amplifier, and the first audio power amplifier amplifies the input working audio signal, and the amplified working audio signal drives the speaker to broadcast the working audio, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset of the multimedia CPU, the control signal output pin of the security CPU is high, the alarm audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low, and the working audio signal output pin of the multimedia CPU is low; the first speaker obtains the alarm audio signal from the security CPU.

[0050] In normal working state, the security switch of the face recognition terminal is not triggered, the switch enable pin of the audio power amplifier receives the control signal from the multimedia CPU, and the first speaker obtains and plays the working audio signal from the multimedia CPU. When the face recognition terminal is attacked, the security switch of the face recognition terminal is triggered, the switch enable pin of the audio power amplifier receives the control signal from the security CPU, and the first speaker obtains and plays the alarm audio signal from the security CPU to realize the alarm.

[0051] In a possible implementation, the control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode, which is further specifically as follows:

[0052] The control signal output pin of the safety CPU is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the switch enable signal pin of the audio power amplifier and the fourth resistor, and the other end of the fourth resistor is grounded;

[0053] In a possible implementation, the control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode, which is further specifically as follows:

[0054] The control signal output pin of the multimedia CPU is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the third resistor, and is connected to the switch enable signal pin of the frequency power amplifier through the third resistor.

[0055] In a second aspect, the present invention further provides an alarm method for a dual-speaker face recognition terminal, which requires providing the device described in the first aspect, and the method comprises:

[0056] Multimedia CPU, used to output working audio signals;

[0057] A security CPU, used for forcibly resetting the multimedia CPU and outputting an alarm audio signal when the security switch of the face recognition terminal is triggered;

[0058] When the face recognition terminal security switch is not triggered:

[0059] The first speaker and the second speaker acquire and play the working audio signal from the multimedia CPU; and

[0060] When the face recognition terminal security switch is triggered:

[0061] The first speaker obtains and plays the alarm audio signal from the security CPU.

[0062] When the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low level, the alarm audio signal output pin of the security CPU is low level, the control signal output pin of the multimedia CPU is high level, the working audio signal output pin of the multimedia CPU outputs a working audio signal, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset on the multimedia CPU, the control signal output pin of the security CPU is high level, the audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low level, and the working audio signal output pin of the multimedia CPU is low level; the first speaker obtains the alarm audio signal from the security CPU.

[0063] Since the method described in the second embodiment of the present invention is the method used by the device of the first embodiment of the present invention, those skilled in the art can understand the method based on the device described in the first embodiment of the present invention, and thus it will not be described in detail here. All methods used by the device of the first embodiment of the present invention belong to the scope of protection of the present invention.

[0064] Embodiment 3

[0065] This embodiment provides an alarm device for a dual-speaker face recognition terminal. Please refer to Figures 2 to 6 , and its specific implementation scheme is as follows:

[0066] (1) When face recognition terminals are used in transaction scenarios, it is extremely important to ensure the security of terminal data. A financial-level security CPU is used to protect the entire device design, and physical security protection is designed for the terminal. When the security mechanism is destroyed, the security switch will be triggered; if the security mechanism is not destroyed, the security switch will not be triggered. The security mechanism triggering process is as follows: Figure 5 .

[0067] (2) The sound-generating component uses a speaker electroacoustic device to play normal working voice and alarm triggered by the safety switch.

[0068] (3) The face recognition terminal adopts a dual speaker design, the first speaker (speaker 1) and the second speaker (speaker 2). The input sound source of speaker 1 comes from the security CPU and multimedia CPU, and the input sound source of speaker 2 comes from the multimedia CPU. Figure 6 :

[0069] a) The safety CPU outputs an alarm audio signal (e.g., a PWM audio signal), which is attenuated by a resistor in series to become an ALARM signal and input to the signal input pin (INN pin) of the audio power amplifier 1 (audio PA1);

[0070] b) The multimedia CPU outputs the audio signal 1LOUTR / N signal, which is input to the INN pin of the audio PA1;

[0071] c) The multimedia CPU outputs the audio signal 2LOUTR / P signal, which is input to the INN pin of the audio PA2;

[0072] (4) When the face recognition terminal is attacked and the security switch is triggered, speaker 1 outputs a security alarm sound.

[0073] (5) Speaker 1 is controlled by the switch enable / SHUTDOWN signal of PA1.

[0074] The / SHUTDOWN signal is controlled by the SPK_CTL_MH1902 signal of the security CPU and the SPK_CTL_RK signal of the multimedia CPU at the same time. Figure 2 :

[0075] a) The SPK_CTL_MH1902 signal and the SPK_CTL_RK signal are connected in series with a diode (for example, a Schottky diode of type BAT54C) and input to the audio PA1 switch enable / SHUTDOWN signal pin;

[0076] b) The diode is used to prevent the SPK_CTL_MH1902 control signal of the security CPU and the SPK_CTL_RK control signal of the multimedia CPU from inputting into each other, causing level interference;

[0077] c) When face recognition is working normally, the security CPU does not control audio PA1 or input audio signals, SPK_CTL_MH1902 defaults to low level, and the ALARM audio signal defaults to low level and is not output externally; audio PA1 is only controlled by the multimedia CPU and input by the multimedia CPU audio LOUTR / N audio. The transaction information of the face recognition terminal is controlled by the multimedia CPU to control audio PA1 and audio PA2 to voice broadcast audio information such as financial operations and financial transactions (i.e., working audio signals);

[0078] d) When the face recognition security is attacked, the security switch will be triggered, the security CPU will forcibly reset the multimedia CPU, SPK_CTL_RK, LOUTR / N will be forcibly pulled low, the security CPU will control the audio PA and audio signal input, pull SPK_CTL_MH1902 high, and the ALARM audio signal will be output. An alarm sound of a certain frequency will be emitted.

[0079] e) Safety switch triggered, safety switch not triggered, SPK_CTL_MH1902, SPK_CTL_MH1902, ALARM and LOUTR / N, constitute the "Face recognition terminal speaker 1 switch signal control and signal output value-added table", as follows:

[0080]

[0081]

[0082] f) The control priority of the security CPU control signal SPK_CTL_MH1902 is higher than that of the multimedia CPU control signal SPK_CTL_RK. The control flow chart of speaker 1 is as follows: Figure 3 .

[0083] (4) Speaker 2: The LOUTL / P sound source is input by the multimedia CPU to audio PA2. The SPK_CTL_RK control signal of the multimedia CPU is input to the switch enable / SHUTDOWN signal pin of audio PA2 to control the switch of audio PA2.

[0084] a) The switch enable signal of audio PA2 shares the enable switch signal SPK_CTL_RK of audio PA1;

[0085] b) When face recognition works normally, the multimedia CPU controls audio PA1 and audio PA2 at the same time, and inputs LOUTR / P and LOUTR / N audio signals to audio PA2 and audio PA1, and drives speaker 1 and speaker 2 synchronously to perform dual-speaker voice broadcast.

[0086] (5) During normal operation, the safety switch is not triggered, SPK_CTL_RK is pulled high, the multimedia CPU audio output LOUT1R / N is connected to the audio PA1 input interface Audio_INN, the multimedia CPU audio output LOUT1R / P is connected to the audio PA2 input interface Audio_INN, the audio PA1 drives the speaker 1, the PA2 drives the speaker 2, and the voice information is output synchronously for broadcasting, such as Figure 4 .

[0087] The embodiment of the present invention removes the buzzer component of the face scanning terminal and uses one of the dual speakers to replace the buzzer electroacoustic device. The single speaker replacing the buzzer is controlled by the security CPU and the multimedia CPU. The security CPU and the multimedia CPU of the face scanning terminal control the audio output of the speaker through the "face scanning terminal speaker 1 switch signal control and audio signal output value-added table" to achieve audio broadcast when the face scanning terminal is working normally, and when the face scanning terminal is attacked, a single speaker sounds an alarm, which reduces the difficulty of structural design, the structure audio outlet hole, reduces electroacoustic components, and reduces design cost, manufacturing cost, and whole machine cost.

[0088] When the face recognition terminal is not attacked and the security mechanism is not triggered, and the face recognition terminal is working normally, the dual speakers work simultaneously, which improves the loudness of the voice broadcast, improves the sound quality of the voice broadcast, and improves the user experience. Especially in noisy environments, it can also effectively broadcast information and accurately prompt transaction operations.

[0089] When the face-scanning transaction terminal is attacked or invaded, the security mechanism is triggered and the terminal security CPU outputs a PWM audio pulse signal. After attenuation, the PWM audio pulse signal is input into the audio amplifier, which drives a single speaker to emit a "beep. beep. beep..." audio alarm of a certain frequency. The volume of the "beep. beep. beep..." alarm can reach 100dB. This method increases the alarm volume and provides a more effective alarm, which deters illegal attackers and reduces the risk of financial losses caused by illegal intrusion of the terminal.

[0090] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An alarm device for a dual-speaker face recognition terminal, characterized in that: include: Multimedia CPU, security CPU, first speaker and second speaker; The security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier; The multimedia CPU is connected to the second speaker via a second audio power amplifier; The control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode; The control signal output pin of the security CPU is connected to the switch enable pin of the first audio power amplifier through a first diode, which is further specifically as follows: The control signal output pin of the safety CPU is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the switch enable signal pin of the audio power amplifier and the fourth resistor, and the other end of the fourth resistor is grounded; The control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode; The control signal output pin of the multimedia CPU is connected to the switch enable pin of the first audio power amplifier through a second diode, which is further specifically as follows: The control signal output pin of the multimedia CPU is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the third resistor, and is connected to the switch enable signal pin of the frequency power amplifier through the third resistor; The security CPU is connected to the security switch of the face recognition terminal; When the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low level, the alarm audio signal output pin of the security CPU is low level, the control signal output pin of the multimedia CPU is high level, the working audio signal output pin of the multimedia CPU outputs a working audio signal, the working audio signal is input to the audio input pin of the first audio power amplifier, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset on the multimedia CPU, the control signal output pin of the security CPU is high level, the alarm audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low level, and the working audio signal output pin of the multimedia CPU is low level; the first speaker obtains the alarm audio signal from the security CPU.

2. The alarm device for a dual-speaker face recognition terminal according to claim 1, characterized in that: The security CPU and the multimedia CPU are connected to the first speaker via a first audio power amplifier, which is further specifically as follows: The alarm audio signal output pin of the safety CPU is connected to one end of a first diode, the other end of the first diode is connected to a signal input pin of the first audio power amplifier through a first resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker; The working audio signal output pin of the multimedia CPU is connected to one end of a second diode, the other end of the second diode is connected to a signal input pin of a first audio power amplifier through a second resistor, and the signal output pin of the first audio power amplifier is connected to the first speaker.

3. An alarm method for a dual-speaker face recognition terminal, characterized in that: A device as claimed in any one of claims 1 to 2 is required, and the method comprises: Multimedia CPU, used to output working audio signals; A security CPU, used for forcibly resetting the multimedia CPU and outputting an alarm audio signal when the security switch of the face recognition terminal is triggered; When the face recognition terminal security switch is not triggered: The first speaker and the second speaker acquire and play the working audio signal from the multimedia CPU; and When the face recognition terminal security switch is triggered: The first speaker obtains and plays the alarm audio signal from the security CPU.

4. The alarm method of a dual-speaker face recognition terminal according to claim 3, characterized in that: When the security switch of the face recognition terminal is not triggered, the control signal output pin of the security CPU is low level, the alarm audio signal output pin of the security CPU is low level, the control signal output pin of the multimedia CPU is high level, the audio signal output pin of the multimedia CPU outputs a working audio signal, and the first speaker obtains the working audio signal from the multimedia CPU; when the security switch of the face recognition terminal is triggered, the security CPU forces a reset on the multimedia CPU, the control signal output pin of the security CPU is high level, the audio signal output pin of the security CPU outputs an alarm audio signal, the control signal output pin of the multimedia CPU is low level, and the working audio signal output pin of the multimedia CPU is low level; the first speaker obtains the alarm audio signal from the security CPU.

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