CN113053089B - Far-field voice privacy protection circuit and method - Google Patents
Far-field voice privacy protection circuit and method Download PDFInfo
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- CN113053089B CN113053089B CN201911377521.8A CN201911377521A CN113053089B CN 113053089 B CN113053089 B CN 113053089B CN 201911377521 A CN201911377521 A CN 201911377521A CN 113053089 B CN113053089 B CN 113053089B
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Abstract
The invention discloses a far-field voice privacy protection circuit and a far-field voice privacy protection method, wherein the far-field voice privacy protection circuit is connected with a far-field voice acquisition module in intelligent equipment and comprises a control module, an interface module, a signal processing module and a switch module; the control module is connected with the signal processing module through an interface module, the signal processing module is connected with the switch module, and the switch module is also connected with the far-field voice acquisition module; the invention can realize far-field voice privacy protection without adding extra interfaces and wires, simplifies the circuit structure and saves the cost.
Description
Technical Field
The invention relates to the technical field of intelligent equipment, in particular to a far-field voice privacy protection circuit and a far-field voice privacy protection method.
Background
Along with popularization of far-field voice application of intelligent equipment, demands for privacy protection of consumers are increasingly outstanding, in order to avoid infringement of privacy of the consumers caused by intrusion of a far-field voice system of the intelligent equipment and automatic collection of surrounding environment sounds, an independent hardware line is generally required to be added to carry out switch control on the far-field voice collection line, a new interface circuit is required to be added to achieve the functions, and one I/O port of a control module in the intelligent equipment is occupied, so that hardware cost is required to be increased, and standardization of a circuit interface is not facilitated.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a far-field voice privacy protection circuit and method, which can achieve far-field voice privacy protection without adding additional interfaces and wires, simplify the circuit structure, and save the cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a far-field voice privacy protection circuit is connected with a far-field voice acquisition module in intelligent equipment and comprises a control module, an interface module, a signal processing module and a switch module; the control module is connected with the signal processing module through an interface module, the signal processing module is connected with the switch module, and the switch module is further connected with the far-field voice acquisition module.
The far-field voice privacy protection circuit further comprises a signal indication module, and the signal indication module is connected with the signal processing module.
The far-field voice privacy protection circuit is characterized in that the control module comprises a toggle switch unit and a key switch unit, and the toggle switch unit and the key switch unit are connected with the signal processing module through the interface module.
In the far-field voice privacy protection circuit, the signal processing module comprises a first signal processing unit and a second signal processing unit, the first signal processing unit is connected with the interface module and the signal indication module, and the second signal processing unit is connected with the interface module and the switch module.
In the far-field voice privacy protection circuit, the toggle switch unit comprises a toggle switch and a first resistor; one end of the first resistor is connected with a pin 5 of the toggle switch, and the other end of the first resistor is connected with the interface module and the key switch unit; and the 4 th pin of the toggle switch is grounded.
In the far-field voice privacy protection circuit, the first signal processing unit comprises a first capacitor, a second resistor, a first voltage stabilizing diode and a second voltage stabilizing diode; the negative electrode of the first voltage-stabilizing diode is connected with the interface module, the positive electrode of the first voltage-stabilizing diode is connected with the positive electrode of the second voltage-stabilizing diode, and the negative electrode of the second voltage-stabilizing diode is grounded; one end of the second resistor is connected with the interface module, and the other end of the second resistor is connected with a KEY _ IN signal end; one end of the first capacitor is connected with the KEY _ IN signal end, and the other end of the first capacitor is grounded.
In the far-field voice privacy protection circuit, the second signal processing unit comprises a third resistor and a fourth resistor; one end of the third resistor is connected with the interface module, and the other end of the third resistor is connected with the switch unit; one end of the fourth resistor is connected with the switch unit, and the other end of the fourth resistor is grounded.
In the far-field voice privacy protection circuit, the switch module comprises a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a triode and an MOS (metal oxide semiconductor) tube; one end of the second capacitor is connected with the base electrode of the triode, and the other end of the second capacitor is grounded; the emitting electrode of the triode is grounded; one end of the third capacitor is connected with electricity, and the other end of the third capacitor is connected with the fifth resistor and the grid electrode of the MOS tube; one end of the fifth resistor is connected with the collector of the triode, and the other end of the fifth resistor is connected with the grid of the MOS tube; one end of the sixth resistor is connected with the collector of the triode, and the other end of the sixth resistor is connected with the power supply; the source electrode of the MOS tube is connected with the power supply, and the drain electrode of the MOS tube is connected with the FFM _ VCC signal end.
A far-field voice privacy protection method applied to the far-field voice privacy protection circuit, the method comprising the following steps:
the control module outputs a control signal according to external setting and outputs the control signal to the signal processing module through the interface module;
The signal processing module samples the control signal and then outputs a sampling signal to the switch module, and the switch module controls the working state of the far-field voice acquisition module according to the sampling signal.
In the far-field voice privacy protection method, the step of outputting a control signal by the control module according to external setting and outputting the control signal to the signal processing module through the interface module comprises:
the toggle switch unit outputs a first control signal according to external setting and outputs the first control signal to the signal processing module through the interface module;
the key switch unit outputs a second control signal according to external setting, and outputs the second control signal to the signal processing module through the interface module.
Compared with the prior art, the far-field voice privacy protection circuit and the far-field voice privacy protection method are characterized in that the far-field voice privacy protection circuit is connected with a far-field voice acquisition module in the intelligent equipment and comprises a control module, an interface module, a signal processing module and a switch module; the control module is connected with the signal processing module through an interface module, the signal processing module is connected with the switch module, and the switch module is also connected with the far-field voice acquisition module; the invention can realize far-field voice privacy protection without adding extra interfaces and wires, simplify the circuit structure and save the cost.
Drawings
Fig. 1 is a block diagram of a far-field voice privacy protection circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of a far-field speech privacy protection circuit according to the present invention;
FIG. 3 is a schematic diagram of a working flow of a far-field voice privacy protection circuit provided in the present invention;
FIG. 4 is a flowchart illustrating steps of a far-field speech privacy protection method according to the present invention;
fig. 5 is a flowchart of the step S100 in the far-field voice privacy protection method provided in the present invention.
Detailed Description
In view of the defects of the prior art, the present invention provides a far-field voice privacy protection circuit and method, which can realize far-field voice privacy protection without adding additional interfaces and wires, simplify the circuit structure, and save the cost.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the far-field voice privacy protection circuit provided by the present invention is connected to a far-field voice acquisition module 10 in an intelligent device, and includes a control module 100, an interface module 200, a signal processing module 300, and a switch module 400; the control module 100 is connected with the signal processing module 300 through an interface module 200, the signal processing module 300 is connected with the switch module 400, the switch module 400 is further connected with the far-field voice acquisition module 10, the control module 100 is arranged on a secondary board of the intelligent device, the signal processing module 300 and the switch module 400 are arranged on a main board of the intelligent device, and the far-field voice acquisition module 10 is arranged on a sound acquisition board; wherein the interface module 200 includes a first interface 210 and a second interface 220, the first interface 210 is located on the sub board, and the second interface 220 is located on the motherboard, the control module 100 is connected to the first interface 210, the signal processing module 300 is connected to the second interface 220, the first interface 210 is connected to the second interface 220 through a 2pin connection line, the signals transmitted by the 2pin connection line are "composite control signals" (first control signal and second control signal) and "ground loop signal" (ground line), the main board and the sub-board are connected through the first interface 210, the second interface 220 and the connecting lines of the first interface 210 and the second interface 220 to form a communication channel, and further, the transmission of information is completed, and the first interface 210 and the second interface 220 are both interfaces inherent to the smart device.
In specific implementation, the control module 100 outputs a control signal according to an external setting, and outputs the control signal to the signal processing module 300 through the interface module 200, the signal processing module 300 samples the control signal and outputs a sampling signal to the switch module 400, and the switch module controls a working state of the far-field speech acquisition module 10 according to the sampling signal; after the intelligent device is powered on, the far-field voice privacy protection circuit is powered on, the control module 100 is externally arranged, so that the control module 100 outputs a corresponding control signal to the first interface 210, the control signal is output to the second interface 220 through a communication channel formed between the first interface 210 and the second interface 220, and then the signal processing module 300 samples the control signal output by the second interface 220 and outputs the sampled signal to the switch module 400, so as to control the switch module 400 to be switched on or switched off. When the switch module 400 is turned on, the far-field voice acquisition module 10 connected with the switch module 400 is turned on by power connection, enters a working state for voice acquisition, and indicates that far-field voice privacy protection is turned off; when the switch module 400 is turned off, the far-field voice collection module 10 is turned off, voice collection is not performed, it indicates that far-field voice privacy protection is turned on, and the intelligent device is currently in a far-field voice privacy protection state, so that the control module 100 controls the working state of the far-field voice collection module 10 to realize far-field voice privacy protection of the intelligent device; in addition, because the first interface 210 and the second interface 220 are the inherent interfaces for transmitting the key switch signals of the intelligent device, no additional interface is needed to be added in the process of realizing far-field voice privacy protection of the intelligent device, so that the circuit structure is simplified, the cost is saved, and interface standardization is facilitated.
Further, the far-field voice privacy protection circuit further comprises a signal indication module 500, the signal indication module 500 is connected with the signal processing module 300, and the signal indication module 500 is separately arranged on an indication board of the intelligent device; the signal processing module 300 is further configured to output status information to the signal indicating module 500 according to the control signal, the signal indicating module 500 displays the working status of the far-field voice collecting module 10 according to the status information, and on one hand, the signal processing module 300 samples the control signal to control the switch module 400 to be turned on or off, so as to control the working status of the far-field voice collecting module 10, thereby implementing far-field voice privacy protection on the smart device; on the other hand, status information is output to the signal indication module 500 according to the control signal, the status information is the working status information of the far-field voice collection module 10, and the signal indication module 500 displays the working status of the far-field voice collection module 10 according to the status information; in this embodiment, the signal indication module 500 displays whether the current far-field voice collection module 10 is turned off in a specific color through an LED indicator, that is, whether the intelligent device is in a far-field voice privacy protection state, so as to more intuitively know the working state of the far-field voice collection module 10.
Further, the control module 100 includes a toggle switch unit 110 and a key switch unit 120, both the toggle switch unit 110 and the key switch unit 120 are connected to the signal processing module 300 through the interface module 200, and the toggle switch unit 110 and the key switch unit 120 are connected to the first interface 210 in parallel; the toggle switch unit 110 outputs a first control signal according to an external setting, and outputs the first control signal to the signal processing module 300 through the interface module 200; the key switch unit 120 outputs a second control signal, that is, a key switch signal, according to an external setting, and outputs the second control signal to the signal processing module 300 through the interface module 200, the key switch unit 120 is a part which is inherent on a sub-board of the intelligent device and provides the key switch signal, and the toggle switch unit 110 is arranged in parallel to output a first control signal so as to control a working state of the far-field acquisition module, so that not only is far-field voice privacy protection realized, but also a communication channel can be shared with the key switch unit 120 in the process, and an additional interface is not required to be added, so that a circuit structure is simplified, and the cost is saved.
Further, the signal processing module 300 includes a first signal processing unit 310 and a second signal processing unit 320, the first signal processing unit 310 connects the second interface 220 and the signal indication module 500, and the second signal processing unit 320 connects the second interface 220 and the switch module 400; the first signal processing unit 310 samples the first control signal or the second control signal and outputs status information to the signal indication module 500; the second signal processing unit 320 samples the first control signal and outputs the sampled signal to the switch module 400, so as to control the operating state of the switch module 400; the second signal processing unit 320 outputs the sampling signal to the far-field voice acquisition module 10 according to the first control signal, so that the working state of the far-field voice acquisition module 10 is effectively controlled, and far-field voice privacy protection is realized; meanwhile, the first signal processing unit 310 outputs the corresponding state information to the signal indication module 500 according to the first control signal or the second control signal, so that the signal indication module 500 can visually display the working state of the far-field speech acquisition module 10.
Specifically, referring to fig. 2, the toggle switch unit 110 includes a toggle switch K1 and a first resistor R1, one end of the first resistor R1 is connected to the 5 th pin of the toggle switch K1, and the other end is connected to the interface module 200 and the key switch unit 120; the 4 th pin of the toggle switch K1 is grounded, and the operating state of the far-field voice acquisition module 10 is controlled by toggling the toggle switch K1 to output a first control signal, so that far-field voice privacy protection is realized.
When the toggle switch K1 is toggled to the ON side, that is, the 6 th pin and the 3 rd pin of the toggle switch K1, the first resistor R1 is connected to the end of the toggle switch K1 and is suspended, that is, the toggle switch K1 outputs a first control signal, at this time, the first control signal is a conduction instruction, and then the second signal processing unit 320 controls the switch module 400 to be conducted according to the conduction instruction, so that the far-field voice acquisition module 10 is powered ON for voice acquisition, and at this time, the far-field voice privacy protection of the smart device is turned off; meanwhile, the first signal processing unit 310 outputs the conducting state information of the far-field voice collecting module 10, that is, the far-field voice privacy shutdown state information to the signal indicating module 500 according to the conducting instruction, and the signal indicating module 500 displays and informs the user that the privacy protection state is currently shutdown through a specific color.
When the toggle switch K1 is toggled to the OFF side, that is, the 1 st pin and the 4 th pin of the toggle switch K1, the first resistor R1 is grounded through the toggle switch K1, at this time, the first control signal output by the toggle switch K1 is a close instruction, and then the second signal processing unit 320 controls the switch module 400 to be closed according to the close instruction, and the far-field voice acquisition module 10 is powered OFF and closed, which indicates that the far-field voice privacy protection is on; meanwhile, the first signal processing unit 310 outputs the closing state information of the far-field voice collecting module 10, that is, the far-field voice privacy protection opening state information to the signal indicating module 500 according to the closing instruction, and then the signal indicating module 500 displays and informs the user that the current state is the closing privacy protection state through a specific color.
Further, the key switch unit 120 includes a key switch K2, one end of the key switch K2 is connected to the other end of the first resistor R1 and the 2 nd pin of the first port P1, the other end of the key switch K2 is grounded, and no matter which side the toggle switch K1 toggles to, when the key switch K2 is pressed, namely, the key switch K2 outputs the second control signal, the far-field speech acquisition module 10 is in the closed state, the first signal processing unit 310 makes the display color of the signal indication module 500 not to change according to the second control signal, namely, the far-field speech acquisition module 10 can be directly controlled to be in the off state by the key switch K2, otherwise, the indication information with unchanged display color of the signal indication module 500 is used, it is clear that the far-field speech acquisition module 10 is in the off state due to the closing of the key switch K2.
Further, with reference to fig. 2, the first signal processing unit 310 includes a first capacitor C1, a second resistor R2, a first zener diode ZD1 and a second zener diode ZD 2; the cathode of the first zener diode ZD1 is connected to the interface module 200, the anode of the first zener diode ZD1 is connected to the anode of the second zener diode ZD2, and the cathode of the second zener diode ZD2 is grounded; one end of the second resistor R2 is connected to the interface module 200, and the other end is connected to a KEY _ IN signal end; one end of the first capacitor C1 is connected to the KEY _ IN signal end, and the other end is grounded, and the first signal processing unit 310 outputs the corresponding state information to the signal indication module 500 according to the first control signal or the second control signal, so that the signal indication module 500 can visually display the working state of the far-field speech acquisition module 10.
Further, the second signal processing unit 320 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the 1 st pin of the second interface P2, one end of the third resistor R3 is connected to the interface module 200, and the other end is connected to the switch module 400; one end of the fourth resistor is connected with the switch module 400, the other end of the fourth resistor is grounded, when the toggle switch K1 is toggled to the ON side, a switch-ON command is correspondingly output, at this time, the voltage of the point a of the main board end is changed into V2 under the partial pressure of the third resistor R3 and the fourth resistor R4, the switch module 400 is switched ON, and then the far-field voice acquisition module 10 is switched ON by power connection for voice acquisition, and the corresponding current intelligent device is in a far-field voice privacy protection closed state; when the toggle switch K1 is toggled to the OFF side, a closing instruction is correspondingly output, at this time, the voltage at the point a of the main board end is changed into V3 under the partial pressure of the first resistor R1, the third resistor R3 and the fourth resistor R4, the switch module 400 is closed, the far-field voice acquisition module 10 is powered OFF and is closed, the corresponding current intelligent device is in a far-field voice privacy protection open state, and the second signal processing unit 320 controls the far-field voice acquisition module 10 to be switched on and OFF according to the control signal of the toggle switch K1, so that the forced switching of the far-field voice privacy protection is realized.
Further, the switch module 400 includes a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a transistor Q1, and a MOS transistor Q2, where an emitter of the transistor Q1 is grounded; one end of the third capacitor C3 is connected to power, and the other end is connected to the fifth resistor R5 and the gate of the MOS transistor Q2; one end of the fifth resistor R5 is connected with the collector of the triode Q1, and the other end of the fifth resistor R5 is connected with the grid of the MOS transistor Q2; one end of the sixth resistor R6 is connected with the collector of the triode Q1, and the other end of the sixth resistor R6 is connected with the power supply; the source electrode of the MOS tube Q1 is connected with electricity, the drain electrode of the MOS tube Q1 is connected with an FFM _ VCC signal end, when the toggle switch K1 is toggled to the ON side, the voltage of the A point of the main board end is V2, the triode Q1 is conducted with the MOS tube Q2, further the voltage of the FFM _ VCC signal end is 3V3STV, the far-field voice acquisition module 10 is connected with electricity and conducted, and the intelligent device is in a far-field voice privacy protection closed state; when the fluctuation switch K1 fluctuates to the OFF side, the voltage of the point a of the main board end is V3, the triode Q1 and the MOS transistor Q2 are cut OFF, the voltage of the FFM _ VCC signal end is 0V, the power supply of the far-field voice acquisition module 10 is disconnected and turned OFF, the intelligent device is in a far-field voice privacy protection state, a toggle switch K1 for controlling the far-field voice acquisition module 10 is additionally arranged on the auxiliary board, the switch module 400 is additionally arranged at the main board end to realize a far-field voice privacy protection control function, the first control signal for the far-field voice acquisition module 10 and the key switch signal for the intelligent device share one signal channel, the far-field voice privacy protection control function can be realized without additionally arranging an interface, the circuit is simplified, the material cost is saved, and the interface standardization is facilitated; in this embodiment, the MOS transistor Q2 is a P-channel MOS transistor Q2.
Further, the far-field voice privacy protection circuit further includes a seventh resistor R7, one end of the seventh resistor R7 is connected to the 1 st pin of the second interface P2, the other end of the seventh resistor R7 is connected to an electrical terminal, the seventh resistor R7 is a pull-up resistor, the first control signal or the second control signal is clamped to a high-level signal, and meanwhile, the pull-up resistor supplies electrical energy to the switch module 400, so that the switch module 400 can supply power to the far-field voice collection module 10 when being turned on.
For better understanding of the present invention, the operation principle of the far-field voice privacy protection circuit of the present invention is described in detail below with reference to fig. 2 and 3:
when the toggle switch K1 is toggled to the ON side, the R1 is connected with the end of the toggle switch K1 and is suspended, at this time, the point a ON the main board is at the voltage division of the first resistor R1, the third resistor R3, the fourth resistor R4 and the seventh resistor R7, the voltage is V2, the triode Q1 is turned ON, the MOS transistor Q2 is turned ON, FFM _ VCC is 3V3STV, the far-field voice acquisition module 10 is electrically connected and turned ON to perform voice acquisition, which indicates that the far-field voice privacy protection is turned off. Meanwhile, the voltage at the point a is connected to an a/D input port of an SOC (System on Chip, where SOC may be understood as a System on Chip) of the intelligent device through a KEY _ IN signal terminal, and the SOC detects the voltage at the KEY _ IN signal terminal, thereby controlling to open related setting options about far-field voice IN a user menu of the intelligent device and output far-field voice privacy protection closing state information to the signal indication module 500, and displaying and informing a user that the privacy protection state is currently closed through a specific color.
When the toggle switch K1 is toggled to the OFF side, the first resistor R1 is close to the end of the toggle switch K1 and is grounded through the toggle switch K1, at this time, the voltage of the point a on the main board is V3 under the divided voltage of the first resistor R1, the third resistor R3, the fourth resistor R4 and the seventh resistor R7, the triode Q1 is turned OFF, the MOS transistor Q2 is turned OFF, FFM _ VCC is 0V, the far-field voice collection module 10 is turned OFF, which indicates that the far-field voice privacy protection is turned on. Meanwhile, the voltage of the point a is connected to an a/D input port of the SOC through a KEY _ IN signal terminal, and after the SOC detects the voltage of the KEY _ IN signal terminal, the SOC outputs far-field voice privacy protection on-state information to the signal indication module 500, and informs the user of the current privacy protection state through specific color display.
No matter the state of the toggle switch K1 is on or off, when the KEY switch K2 is pressed, the voltage at the point A is V3, the voltage at the point A is connected to an A/D input port of the SOC through a KEY _ IN signal end, and the SOC detects the voltage at the KEY _ IN signal end and executes corresponding KEY operation. At this time, the display color of the signaling module 500 is not changed.
When the intelligent device has no far-field voice function, the toggle switch K1, the first resistor R1, the third resistor R3, the fourth resistor R4, the triode Q1, the sixth resistor R6, the fifth resistor R5, the third resistor R3 and the MOS transistor Q2 do not need to be mounted, at this time, when the KEY switch K2 is not operated, the voltage at the point a is V1, and after the SOC detects that the voltage at the KEY _ IN signal end is V1, the setting items of the far-field voice part IN the user menu can be shielded; otherwise, the SOC may determine whether there is a far-field voice collecting module or not by detecting the voltage of the KEY _ IN signal terminal, and whether the intelligent device has a far-field voice function or not, so as to determine whether to open a far-field voice related setting item IN the user menu.
According to the invention, the control signal of the far-field voice acquisition module and the key switch signal of the intelligent device share one IO port, the purpose of controlling the key switch and multiplexing the control of the far-field voice acquisition module is achieved by monitoring the change of the voltage of the A point, the circuit structure is simplified, the cost is saved, and the interface standardization is facilitated.
The present invention also provides a far-field voice privacy protection method, which is applied to the far-field voice privacy protection circuit described above, referring to fig. 4, the far-field voice privacy protection method includes the following steps:
s100, the control module outputs a control signal according to external setting and outputs the control signal to the signal processing module through the interface module;
s200, the signal processing module samples the control signal and outputs a sampling signal to the switch module, and the switch module controls the working state of the far-field voice acquisition module according to the sampling signal.
Specifically, referring to fig. 5, the step S100 includes:
s110, the toggle switch unit outputs a first control signal according to external setting, and outputs the first control signal to the signal processing module through the interface module;
And S120, outputting a second control signal by the key switch unit according to external setting, and outputting the second control signal to the signal processing module through the interface module.
In summary, the present invention provides a far-field voice privacy protection circuit and a method thereof, where the far-field voice privacy protection circuit is connected to a far-field voice acquisition module in an intelligent device, and includes a control module, an interface module, a signal processing module and a switch module; the control module is connected with the signal processing module through an interface module, the signal processing module is connected with the switch module, and the switch module is also connected with the far-field voice acquisition module; the invention can realize far-field voice privacy protection without adding extra interfaces and wires, simplifies the circuit structure and saves the cost.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (9)
1. A far-field voice privacy protection circuit is connected with a far-field voice acquisition module in intelligent equipment and is characterized by comprising a control module, an interface module, a signal processing module and a switch module; the control module is connected with the signal processing module through an interface module, the signal processing module is connected with the switch module, and the switch module is also connected with the far-field voice acquisition module;
The control module comprises a toggle switch unit and a key switch unit, and the toggle switch unit and the key switch unit are both connected with the signal processing module through the interface module;
the toggle switch unit is used for outputting a first control signal, the signal processing module is used for sampling the first control signal and outputting a corresponding sampling signal to the switch module, and the switch module controls the far-field voice module to be switched on or switched off according to the sampling signal;
the key switch unit is used for outputting a second control signal so as to close the far-field voice acquisition module in any state of the toggle switch unit.
2. The far-field voice privacy protection circuit of claim 1, further comprising a signal indication module coupled to the signal processing module.
3. The far-field voice privacy protection circuit of claim 2, wherein the signal processing module comprises a first signal processing unit and a second signal processing unit, the first signal processing unit is connected with the interface module and the signal indication module, and the second signal processing unit is connected with the interface module and the switch module.
4. The far-field voice privacy protection circuit of claim 1, wherein the toggle switch unit comprises a toggle switch and a first resistor; one end of the first resistor is connected with a pin 5 of the toggle switch, and the other end of the first resistor is connected with the interface module and the key switch unit; and the 4 th pin of the toggle switch is grounded.
5. The far-field voice privacy protection circuit of claim 3, wherein the first signal processing unit comprises a first capacitor, a second resistor, a first zener diode, and a second zener diode; the negative electrode of the first voltage-stabilizing diode is connected with the interface module, the positive electrode of the first voltage-stabilizing diode is connected with the positive electrode of the second voltage-stabilizing diode, and the negative electrode of the second voltage-stabilizing diode is grounded; one end of the second resistor is connected with the interface module, and the other end of the second resistor is connected with a KEY _ IN signal end; one end of the first capacitor is connected with a KEY _ IN signal end, and the other end of the first capacitor is grounded.
6. The far-field voice privacy protection circuit of claim 3, wherein the second signal processing unit comprises a third resistor and a fourth resistor; one end of the third resistor is connected with the interface module, and the other end of the third resistor is connected with the switch module; one end of the fourth resistor is connected with the switch module, and the other end of the fourth resistor is grounded.
7. The far-field voice privacy protection circuit according to claim 6, wherein the switch module comprises a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a triode and a MOS (metal oxide semiconductor) transistor; one end of the second capacitor is connected with the base electrode of the triode, and the other end of the second capacitor is grounded; the emitting electrode of the triode is grounded; one end of the third capacitor is connected with electricity, and the other end of the third capacitor is connected with the fifth resistor and the grid electrode of the MOS tube; one end of the fifth resistor is connected with the collector of the triode, and the other end of the fifth resistor is connected with the grid of the MOS tube; one end of the sixth resistor is connected with the collector of the triode, and the other end of the sixth resistor is connected with the power supply; the source electrode of the MOS tube is connected with the power supply, and the drain electrode of the MOS tube is connected with the FFM-VCC signal end.
8. A far-field voice privacy protection method applied to the far-field voice privacy protection circuit according to any one of claims 1 to 7, the method comprising the steps of: the control module outputs a control signal according to external setting and outputs the control signal to the signal processing module through the interface module; the signal processing module samples the control signal and outputs a sampling signal to the switch module, and the switch module controls the working state of the far-field voice acquisition module according to the sampling signal;
The control module comprises a toggle switch unit and a key switch unit, and the toggle switch unit and the key switch unit are both connected with the signal processing module through the interface module;
the toggle switch unit is used for outputting a first control signal, the signal processing module is used for sampling the first control signal and outputting a corresponding sampling signal to the switch module, and the switch module controls the far-field voice module to be switched on or switched off according to the sampling signal;
the key switch unit is used for outputting a second control signal so as to close the far-field voice acquisition module in any state of the toggle switch unit.
9. The far-field voice privacy protection method according to claim 8, wherein the step of outputting the control signal by the control module according to an external setting and outputting the control signal to the signal processing module through the interface module comprises: the toggle switch unit outputs a first control signal according to external setting and outputs the first control signal to the signal processing module through the interface module; the key switch unit outputs a second control signal according to external setting, and outputs the second control signal to the signal processing module through the interface module.
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| CN208638486U (en) * | 2018-05-15 | 2019-03-22 | 四川长虹电器股份有限公司 | A kind of far field voice module interface circuit |
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