CN105631990A - Frequency stabilization circuit based wireless voice recognition door control system - Google Patents
Frequency stabilization circuit based wireless voice recognition door control system Download PDFInfo
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- CN105631990A CN105631990A CN201510963214.3A CN201510963214A CN105631990A CN 105631990 A CN105631990 A CN 105631990A CN 201510963214 A CN201510963214 A CN 201510963214A CN 105631990 A CN105631990 A CN 105631990A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/30—Individual registration on entry or exit not involving the use of a pass
- G07C9/32—Individual registration on entry or exit not involving the use of a pass in combination with an identity check
- G07C9/37—Individual registration on entry or exit not involving the use of a pass in combination with an identity check using biometric data, e.g. fingerprints, iris scans or voice recognition
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Abstract
The invention discloses a frequency stabilization circuit based wireless voice recognition door control system. The system mainly comprises a central processor, a second wireless transmission module, an A/D (Analog/Digital) conversion circuit, a door control driving circuit, an alarm module, a display module, a memory, a first wireless transmission module, a sound sensor connected with the A/D conversion circuit, a door control unit connected with the door control driving circuit, a signal processing circuit connected with the second wireless transmission module, a PC (Personal Computer) connected with the signal processing circuit, and the like, wherein the A/D conversion circuit, the door control driving circuit, the alarm module, the display module, the memory and the first wireless transmission module are connected with the central processor respectively. According to the system, data is wirelessly transmitted and the door control unit exchanges information with the PC, so that the difficulty of construction is lowered and a manager is facilitated to transform a door control network in the future. The system is provided with a frequency stabilization circuit, and the frequency stabilization circuit can perform frequency stabilization processing on the frequency of a sound signal acquired by the sound sensor to enable the processed sound frequency to be more stable so as to improve the identification precision of the system.
Description
Technical field
The present invention relates to a kind of gate control system, specifically refer to a kind of wireless speech identification gate control system based on frequency stabilization circuit.
Background technology
Gate control system is new-modernization management of public safety system, it integrates microcomputer automatic identification technology and modern safety management measure, relate to many new techniques such as electronics, machinery, optics, computer technology, communication technology and biotechnology, be important department gateway realize safety precaution management effective guarantee. Existing gate control system mostly is wire transmission mode, the communication of each controller and PC is generally by RS-232, RS-485 or what CAN carried out, and the physical connection between equipment is complicated, network rebuilding constructional difficulties is loaded down with trivial details especially for wiring newly-increased Adding User.
Summary of the invention
It is an object of the invention to overcome existing gate control system is wire transmission mode, and the physical connection between its equipment is complicated, the defect of network rebuilding constructional difficulties, it is provided that a kind of wireless speech identification gate control system based on frequency stabilization circuit.
The purpose of the present invention is achieved through the following technical solutions: a kind of wireless speech identification gate control system based on frequency stabilization circuit, main by central processing unit, second wireless transport module, the A/D change-over circuit being connected with central processing unit respectively, gate inhibition's drive circuit, alarm module, display module, memorizer and the first wireless transport module, the sound transducer being connected with A/D change-over circuit, the gate inhibition being connected with gate inhibition's drive circuit, the signal processing circuit being connected with the second wireless transport module, the PC being connected with signal processing circuit, and the printer composition being connected with PC, described first wireless transport module is connected by wireless network and the second wireless transport module, in order to better implement the present invention, the present invention is also serially connected with frequency stabilization circuit between sound transducer and A/D change-over circuit.
Further, described frequency stabilization circuit is by amplifier P1, amplifier P2, audion VT5, audion VT6, one end is connected with the positive pole of amplifier P1, the resistance R13 of other end ground connection, negative pole is connected with the positive pole of amplifier P1, positive pole then forms the electric capacity C7 of the input of this frequency stabilization circuit, it is serially connected in the resistance R14 between the outfan of amplifier P1 and the base stage of audion VT6, one end is connected with the emitter stage of audion VT6, the resistance R15 of another termination 12V voltage, N pole is connected with the positive pole of amplifier P2, the diode D5 that P pole is then connected with the emitter stage of audion VT6, positive pole is connected with the negative pole of amplifier P1, the electric capacity C8 that negative pole is then connected with the emitter stage of audion VT5, it is serially connected in the resistance R16 between the colelctor electrode of audion VT6 and the positive pole of amplifier P2, P pole is connected with the negative pole of amplifier P1, the diode D4 that N pole is then connected with the base stage of audion VT5, and positive pole is connected with the colelctor electrode of audion VT6, the electric capacity C9 composition of minus earth, the emitter stage of described audion VT5 is connected with the colelctor electrode of audion VT6, and its colelctor electrode is then connected with the negative pole of electric capacity C9, the minus earth of described amplifier P2, its outfan then forms the outfan of this frequency stabilization circuit and is connected with the input of A/D change-over circuit, the input of described frequency stabilization circuit is then connected with sound transducer.
Described signal processing circuit is by signal compensation circuit, the phase lock circuitry being connected with signal compensation circuit, and the filter circuit composition being connected with phase lock circuitry; Input and second wireless transport module of described signal compensation circuit are connected, and the outfan of filter circuit is then connected with PC.
Described signal compensation circuit is by audion VT1, field effect transistor MOS1, positive pole grid with field effect transistor MOS1 after resistance R3 is connected, the polar capacitor C1 of minus earth, one end is connected with the positive pole of polar capacitor C1, the resistance R2 of other end ground connection, negative pole is connected with the grid of field effect transistor MOS1, positive pole then forms the polar capacitor C2 of the input of this signal compensation circuit, one end is connected with the base stage of audion VT1, the resistance R4 that the other end is then connected with the positive pole of polar capacitor C1 after resistance R1, N pole is connected with the source electrode of field effect transistor MOS1, the diode D1 of P pole ground connection, and positive pole is connected with the colelctor electrode of audion VT1, the polar capacitor C3 composition that negative pole is then connected with the N pole of diode D1, the source electrode of described field effect transistor MOS1 is connected with phase lock circuitry, and its drain electrode is then connected with the base stage of audion VT1, the emitter stage of described audion VT1 is connected with phase lock circuitry, the junction point of described resistance R1 and resistance R4 connects 12V voltage.
Described phase lock circuitry is by phase-locked chip U1, audion VT2, audion VT3, field effect transistor MOS2, it is serially connected in the resistance R5 between the base stage of audion VT2 and the base stage of audion VT3, P pole is connected with the drain electrode of field effect transistor MOS2, the diode D3 that N pole is then connected with the colelctor electrode of audion VT2 after resistance R6, it is serially connected in the resistance R8 between the source electrode of field effect transistor MOS2 and the COMP pin of phase-locked chip U1, P pole is connected with the colelctor electrode of audion VT3, the diode D2 that N pole is then connected with the source electrode of field effect transistor MOS2 after resistance R7, positive pole is connected with the FB pin of phase-locked chip U1, the electric capacity C4 that negative pole is then connected with the N pole of diode D2, positive pole is connected with the DRV pin of phase-locked chip U1, the electric capacity C5 of minus earth, one end is connected with the N pole of diode D3, the resistance R9 that the other end is then connected with the VSS pin of phase-locked chip U1, and one end is connected with the N pole of diode D3, the resistance R10 composition that the other end is then connected with the VDD pin of phase-locked chip U1, the colelctor electrode of described audion VT2 is connected with the emitter stage of audion VT1, and its emitter stage is then connected with the emitter stage of audion VT3, the described base stage of audion VT3 is connected with the source electrode of field effect transistor MOS1, and its emitter stage is then connected with the grid of field effect transistor MOS2, the TOFF pin of described phase-locked chip U1 is all connected with filter circuit with CS pin.
Described filtered electrical routing amplifier P, audion VT4, it is serially connected in the resistance R11 between TOFF pin and the positive pole of amplifier P of phase-locked chip U1, it is serially connected in the resistance R12 between CS pin and the base stage of audion VT4 of phase-locked chip U1 and the electric capacity C6 composition that positive pole is connected, negative pole is then connected with the outfan of amplifier P with the emitter stage of audion VT4; The emitter stage of described audion VT4 is connected with the negative pole of amplifier P, its grounded collector; The outfan of described amplifier P forms the outfan of this filter circuit.
Described phase-locked chip U1 is UCT4392 type integrated chip.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention adopts wireless mode to carry out data transmission, it is achieved the information of access control and PC exchanges, and decreases difficulty of construction, is beneficial to manager's transformation to gate inhibition's network in the future.
(2) signal after being wirelessly transferred can be processed by the present invention, thus improve the accuracy of the data that PC receives.
(3) present invention is provided with frequency stabilization circuit, and its sound signal frequencies that can sound transducer be collected carries out frequency stabilization process, makes the sound frequency after process more stable, such that it is able to improve the accuracy of identification of the present invention.
Accompanying drawing explanation
Fig. 1 is the overall structure block diagram of the present invention.
Fig. 2 is the structure chart of the signal processing circuit of the present invention.
Fig. 3 is the structure chart of the frequency stabilization circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, a kind of wireless speech identification gate control system based on frequency stabilization circuit of the present invention, main by central processing unit, second wireless transport module, the A/D change-over circuit being connected with central processing unit respectively, gate inhibition's drive circuit, alarm module, display module, memorizer and the first wireless transport module, the frequency stabilization circuit being connected with A/D change-over circuit, the sound transducer being connected with frequency stabilization circuit, the gate inhibition being connected with gate inhibition's drive circuit, the signal processing circuit being connected with the second wireless transport module, the PC being connected with signal processing circuit, and the printer composition being connected with PC, described first wireless transport module is connected by wireless network and the second wireless transport module.
This sound transducer is arranged near gate inhibition, for collected sound signal. The sound signal frequencies that frequency stabilization circuit is then used for sound transducer is collected carries out frequency stabilization process, makes the sound frequency after process more stable. A/D change-over circuit exports to central processing unit for the analogue signal of sound transducer output is converted to the signal of telecommunication. This central processing unit is for controlling the running of whole system, and it preferentially adopts the SPCE061A single-chip microcomputer that Taiwan Ling Yang company produces to realize. Memorizer is then for storing the acoustical signal that can pass in and out gate inhibition personnel in advance; Alarm module adopts traditional buzzer, for acoustical signal coupling not pair time sound the alarm. Display module is then for simultaneous display recognition result, and it uses display to realize, and gate inhibition's drive circuit is opening for access control then. First wireless transport module and the second wireless transport module are for being wirelessly transferred signal, and preferential employing PTR2000 type wireless transport module realizes. Signal processing circuit is for processing to the received signal. This PC is then for storing signal; Printer is then for printing data signal. The IOA2 pin of this SPCE061A type single-chip microcomputer is connected with the outfan of A/D change-over circuit, its IOA1 pin is then connected with the input of gate inhibition's drive circuit, its IOA6 pin is then connected with memorizer, its IOA5 pin is then connected with display module, its DAC1 pin is then connected with alarm module, and its IOA3 pin is then connected with the DI pin of the first wireless transport module. The DI pin of described second wireless transport module is then connected with signal processing circuit. Described A/D change-over circuit, gate inhibition's drive circuit, memorizer, sound transducer, PC and printer all adopt prior art to realize.
As in figure 2 it is shown, described signal processing circuit is by signal compensation circuit, the phase lock circuitry being connected with signal compensation circuit, and the filter circuit composition being connected with phase lock circuitry. The input of described signal compensation circuit and the DI pin of the second wireless transport module are connected, and the outfan of filter circuit is then connected with PC.
Described signal compensation circuit is by audion VT1, field effect transistor MOS1, resistance R1, resistance R2, resistance R3, resistance R4, polar capacitor C1, polar capacitor C2, polar capacitor C3 and diode D1.
Wherein, the positive pole of polar capacitor C1 grid with field effect transistor MOS1 after resistance R3 be connected, its minus earth. One end of resistance R2 is connected with the positive pole of polar capacitor C1, its other end ground connection. The negative pole of polar capacitor C2 is connected with the grid of field effect transistor MOS1, its positive pole then forms the input of this signal compensation circuit. One end of resistance R4 is connected with the base stage of audion VT1, its other end is then connected with the positive pole of polar capacitor C1 after resistance R1. The N pole of diode D1 is connected with the source electrode of field effect transistor MOS1, its P pole ground connection. The positive pole of polar capacitor C3 is connected with the colelctor electrode of audion VT1, its negative pole is then connected with the N pole of diode D1.
The source electrode of this field effect transistor MOS1 is connected with phase lock circuitry, and its drain electrode is then connected with the base stage of audion VT1. The emitter stage of described audion VT1 is connected with phase lock circuitry. The junction point of described resistance R1 and resistance R4 connects 12V voltage. The decay of signal appearance in being wirelessly transferred process can be compensated by this signal compensation circuit, wherein field effect transistor MOS1, audion VT1, diode D1 and polar capacitor C3 form amplifying circuit, signal is amplified processing by it, thus compensate for the decay that signal occurs in transmitting procedure.
Described phase lock circuitry is made up of phase-locked chip U1, audion VT2, audion VT3, field effect transistor MOS2, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D2, diode D3, electric capacity C4 and electric capacity C5.
During connection, resistance R5 is serially connected between the base stage of audion VT2 and the base stage of audion VT3. The P pole of diode D3 is connected with the drain electrode of field effect transistor MOS2, its N pole is then connected with the colelctor electrode of audion VT2 after resistance R6. Resistance R8 is serially connected between the source electrode of field effect transistor MOS2 and the COMP pin of phase-locked chip U1. The P pole of diode D2 is connected with the colelctor electrode of audion VT3, its N pole then after resistance R7 source electrode with field effect transistor MOS2 be connected. The positive pole of electric capacity C4 is connected with the FB pin of phase-locked chip U1, its negative pole is then connected with the N pole of diode D2. The positive pole of electric capacity C5 is connected with the DRV pin of phase-locked chip U1, its minus earth. One end of resistance R9 is connected with the N pole of diode D3, its other end is then connected with the VSS pin of phase-locked chip U1. One end of resistance R10 is connected with the N pole of diode D3, its other end is then connected with the VDD pin of phase-locked chip U1.
Meanwhile, the colelctor electrode of described audion VT2 is connected with the emitter stage of audion VT1, and its emitter stage is then connected with the emitter stage of audion VT3. The described base stage of audion VT3 is connected with the source electrode of field effect transistor MOS1, and its emitter stage is then connected with the grid of field effect transistor MOS2. The TOFF pin of described phase-locked chip U1 is all connected with filter circuit with CS pin. The frequency of signal can be locked by this phase lock circuitry, so that signal is more stable, this phase-locked chip U1 is preferably UCT4392 type integrated chip and realizes.
Described filtered electrical routing amplifier P, audion VT4, it is serially connected in the resistance R11 between TOFF pin and the positive pole of amplifier P of phase-locked chip U1, it is serially connected in the resistance R12 between CS pin and the base stage of audion VT4 of phase-locked chip U1 and the electric capacity C6 composition that positive pole is connected, negative pole is then connected with the outfan of amplifier P with the emitter stage of audion VT4. The emitter stage of described audion VT4 is connected with the negative pole of amplifier P, its grounded collector; The outfan of described amplifier P forms the outfan of this filter circuit. Interference signal in signal can be suppressed by this filter circuit, makes the signal stored by PC more accurate.
As it is shown on figure 3, frequency stabilization circuit is made up of amplifier P1, amplifier P2, audion VT5, audion VT6, resistance R13, resistance R14, resistance R15, resistance R16, electric capacity C7, electric capacity C8, electric capacity C9, diode D4 and diode D5.
During connection, one end of resistance R13 is connected with the positive pole of amplifier P1, its other end ground connection. The negative pole of electric capacity C7 is connected with the positive pole of amplifier P1, its positive pole then forms the input of this frequency stabilization circuit and is connected with sound transducer. Resistance R14 is serially connected between the outfan of amplifier P1 and the base stage of audion VT6. One end of resistance R15 is connected with the emitter stage of audion VT6, its another termination 12V voltage. The N pole of diode D5 is connected with the positive pole of amplifier P2, its P pole is then connected with the emitter stage of audion VT6. The positive pole of electric capacity C8 is connected with the negative pole of amplifier P1, its negative pole is then connected with the emitter stage of audion VT5. Resistance R16 is serially connected between the colelctor electrode of audion VT6 and the positive pole of amplifier P2. The P pole of diode D4 is connected with the negative pole of amplifier P1, its N pole is then connected with the base stage of audion VT5. The positive pole of electric capacity C9 is connected with the colelctor electrode of audion VT6, its minus earth.
With entering, the emitter stage of described audion VT5 is connected with the colelctor electrode of audion VT6, and its colelctor electrode is then connected with the negative pole of electric capacity C9. The minus earth of described amplifier P2, its outfan then forms the outfan of this frequency stabilization circuit and is connected with the input of A/D change-over circuit. The sound signal frequencies that sound transducer can be collected by this frequency stabilization circuit carries out frequency stabilization process, makes the sound frequency after process more stable, such that it is able to improve the accuracy of identification of the present invention.
During work, it is necessary to the personnel of turnover send signal to sound transducer, this sound transducer then gathers voice signal and is sent to frequency stabilization circuit, and this frequency stabilization circuit is sent to A/D change-over circuit after acoustical signal is carried out frequency stabilization process. This A/D change-over circuit is sent to central processing unit after voice analog signal is converted to the signal of telecommunication. This central processing unit mates the signal of input with the signal stored in advance in memorizer, if it fails to match, central processing unit then sends command signal makes alarm module report to the police to alarm module. If the match is successful, central processing unit then sends command signal to gate inhibition's drive circuit, and this gate inhibition's drive circuit then access control is opened. This display module then shows the matching result of signal. Simultaneously, the temporal information of the acoustic information of the personnel of entrance, entrance gate inhibition is sent to the second wireless transport module by wireless network also by the first wireless transport module by central processing unit, and the second wireless transport module sends a signal to send PC again to after signal processing circuit processes and stores.
As it has been described above, just can well implement the present invention.
Claims (7)
1. the wireless speech identification gate control system based on frequency stabilization circuit, main by central processing unit, second wireless transport module, A/D change-over circuit, gate inhibition's drive circuit, alarm module, display module, memorizer and the first wireless transport module being connected with central processing unit respectively, the sound transducer being connected with A/D change-over circuit, the gate inhibition being connected with gate inhibition's drive circuit, the signal processing circuit being connected with the second wireless transport module, the PC being connected with signal processing circuit, and the printer composition being connected with PC; Described first wireless transport module is connected by wireless network and the second wireless transport module; It is characterized in that, between sound transducer and A/D change-over circuit, be also serially connected with frequency stabilization circuit.
2. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 1, it is characterized in that: described frequency stabilization circuit is by amplifier P1, amplifier P2, audion VT5, audion VT6, one end is connected with the positive pole of amplifier P1, the resistance R13 of other end ground connection, negative pole is connected with the positive pole of amplifier P1, positive pole then forms the electric capacity C7 of the input of this frequency stabilization circuit, it is serially connected in the resistance R14 between the outfan of amplifier P1 and the base stage of audion VT6, one end is connected with the emitter stage of audion VT6, the resistance R15 of another termination 12V voltage, N pole is connected with the positive pole of amplifier P2, the diode D5 that P pole is then connected with the emitter stage of audion VT6, positive pole is connected with the negative pole of amplifier P1, the electric capacity C8 that negative pole is then connected with the emitter stage of audion VT5, it is serially connected in the resistance R16 between the colelctor electrode of audion VT6 and the positive pole of amplifier P2, P pole is connected with the negative pole of amplifier P1, the diode D4 that N pole is then connected with the base stage of audion VT5, and positive pole is connected with the colelctor electrode of audion VT6, the electric capacity C9 composition of minus earth, the emitter stage of described audion VT5 is connected with the colelctor electrode of audion VT6, and its colelctor electrode is then connected with the negative pole of electric capacity C9, the minus earth of described amplifier P2, its outfan then forms the outfan of this frequency stabilization circuit and is connected with the input of A/D change-over circuit, the input of described frequency stabilization circuit is then connected with sound transducer.
3. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 2, it is characterized in that: described signal processing circuit is by signal compensation circuit, the phase lock circuitry being connected with signal compensation circuit, and the filter circuit composition being connected with phase lock circuitry; Input and second wireless transport module of described signal compensation circuit are connected, and the outfan of filter circuit is then connected with PC.
4. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 3, it is characterized in that: described signal compensation circuit is by audion VT1, field effect transistor MOS1, positive pole grid with field effect transistor MOS1 after resistance R3 is connected, the polar capacitor C1 of minus earth, one end is connected with the positive pole of polar capacitor C1, the resistance R2 of other end ground connection, negative pole is connected with the grid of field effect transistor MOS1, positive pole then forms the polar capacitor C2 of the input of this signal compensation circuit, one end is connected with the base stage of audion VT1, the resistance R4 that the other end is then connected with the positive pole of polar capacitor C1 after resistance R1, N pole is connected with the source electrode of field effect transistor MOS1, the diode D1 of P pole ground connection, and positive pole is connected with the colelctor electrode of audion VT1, the polar capacitor C3 composition that negative pole is then connected with the N pole of diode D1, the source electrode of described field effect transistor MOS1 is connected with phase lock circuitry, and its drain electrode is then connected with the base stage of audion VT1, the emitter stage of described audion VT1 is connected with phase lock circuitry, the junction point of described resistance R1 and resistance R4 connects 12V voltage.
5. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 4, it is characterized in that: described phase lock circuitry is by phase-locked chip U1, audion VT2, audion VT3, field effect transistor MOS2, it is serially connected in the resistance R5 between the base stage of audion VT2 and the base stage of audion VT3, P pole is connected with the drain electrode of field effect transistor MOS2, the diode D3 that N pole is then connected with the colelctor electrode of audion VT2 after resistance R6, it is serially connected in the resistance R8 between the source electrode of field effect transistor MOS2 and the COMP pin of phase-locked chip U1, P pole is connected with the colelctor electrode of audion VT3, the diode D2 that N pole is then connected with the source electrode of field effect transistor MOS2 after resistance R7, positive pole is connected with the FB pin of phase-locked chip U1, the electric capacity C4 that negative pole is then connected with the N pole of diode D2, positive pole is connected with the DRV pin of phase-locked chip U1, the electric capacity C5 of minus earth, one end is connected with the N pole of diode D3, the resistance R9 that the other end is then connected with the VSS pin of phase-locked chip U1, and one end is connected with the N pole of diode D3, the resistance R10 composition that the other end is then connected with the VDD pin of phase-locked chip U1, the colelctor electrode of described audion VT2 is connected with the emitter stage of audion VT1, and its emitter stage is then connected with the emitter stage of audion VT3, the described base stage of audion VT3 is connected with the source electrode of field effect transistor MOS1, and its emitter stage is then connected with the grid of field effect transistor MOS2, the TOFF pin of described phase-locked chip U1 is all connected with filter circuit with CS pin.
6. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 5, it is characterized in that: described filtered electrical routing amplifier P, audion VT4, it is serially connected in the resistance R11 between TOFF pin and the positive pole of amplifier P of phase-locked chip U1, it is serially connected in the resistance R12 between CS pin and the base stage of audion VT4 of phase-locked chip U1 and the electric capacity C6 composition that positive pole is connected, negative pole is then connected with the outfan of amplifier P with the emitter stage of audion VT4; The emitter stage of described audion VT4 is connected with the negative pole of amplifier P, its grounded collector; The outfan of described amplifier P forms the outfan of this filter circuit.
7. a kind of wireless speech identification gate control system based on frequency stabilization circuit according to claim 6, it is characterised in that: described phase-locked chip U1 is UCT4392 type integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510963214.3A CN105631990A (en) | 2015-12-19 | 2015-12-19 | Frequency stabilization circuit based wireless voice recognition door control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510963214.3A CN105631990A (en) | 2015-12-19 | 2015-12-19 | Frequency stabilization circuit based wireless voice recognition door control system |
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| CN105631990A true CN105631990A (en) | 2016-06-01 |
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| CN201510963214.3A Pending CN105631990A (en) | 2015-12-19 | 2015-12-19 | Frequency stabilization circuit based wireless voice recognition door control system |
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