CN114630235B - Call voice acquisition system and control method thereof - Google Patents

Call voice acquisition system and control method thereof Download PDF

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Publication number
CN114630235B
CN114630235B CN202210096496.1A CN202210096496A CN114630235B CN 114630235 B CN114630235 B CN 114630235B CN 202210096496 A CN202210096496 A CN 202210096496A CN 114630235 B CN114630235 B CN 114630235B
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microphone
signal
switching tube
module
power supply
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CN114630235A (en
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邓海明
曾建国
郭君忠
李枝阳
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Huizhou Foryou General Electronics Co Ltd
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Huizhou Foryou General Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transmitters (AREA)
  • Telephone Function (AREA)

Abstract

The invention relates to the technical field of information equipment, and provides a call voice acquisition system and a control method thereof, wherein a baseband module, an audio processing module, an MIC diagnosis module, an MCU, an audio acquisition module and an audio output module are arranged to form a remote information processing system with automatic recovery of TBOX call faults, and the MIC diagnosis module is arranged to carry out fault diagnosis on a main MIC (first microphone) based on double protection of the first microphone and the second microphone to judge whether the main MIC works normally or not, so that the main MIC is automatically switched to a standby MIC (second microphone) to carry out call when damaged, and the TBOX emergency call function is effectively ensured.

Description

Call voice acquisition system and control method thereof
Technical Field
The invention relates to the technical field of information equipment, in particular to a call voice acquisition system and a control method thereof.
Background
The internet of vehicles system comprises four parts: host computer, on-vehicle T-BOX, cell-phone APP and background system. The host is mainly used for video and audio entertainment in the vehicle and vehicle information display; the Telematics BOX, namely the vehicle-mounted T-BOX, is mainly used for communicating with a background system/a mobile phone APP, and realizes vehicle information display and control of the mobile phone APP.
After a user sends a control command through a mobile phone APP, a TSP background sends a monitoring request command to a vehicle-mounted T-BOX, after the vehicle acquires the control command, the vehicle sends a control message through a CAN bus and realizes control of the vehicle, and finally an operation result is fed back to the mobile phone APP of the user, and only the function CAN help the user to remotely start the vehicle, open an air conditioner, adjust a seat to a proper position and the like.
The vehicle-mounted TBOX is generally only provided with a MIC (microphone), when the MIC fails, effective communication cannot be carried out in the process of TBOX emergency communication, and the safety of lives and properties of vehicle owners is threatened.
The normal checking method for the normal operation of the conventional microphone mainly comprises two methods: one is to manually check whether the sound recording collected by the listening machine is normal or not, which is time-consuming and labor-consuming and has high cost; another is to remotely view the microphone invocation log to determine whether the microphone is invoked normally. However, the log calling method can only judge whether the microphone circuit is normal or call is normal, but cannot judge whether the recording content is normal or not, and cannot judge whether the microphone has faults or not.
Disclosure of Invention
The invention provides a call voice acquisition system and a control method thereof, which solve the technical problems that the existing vehicle-mounted T-BOX single microphone is arranged, emergency danger avoidance cannot be carried out on fault conditions, the life and property safety of a vehicle owner is further threatened, and the detection efficiency of the existing microphone fault detection method is low.
In order to solve the technical problems, the invention provides a call voice acquisition system which comprises a baseband module, an audio processing module, an MIC diagnosis module, an MCU and an audio acquisition module and an audio output module connected with the audio processing module, wherein the audio acquisition module is also connected with the audio acquisition module and the MIC diagnosis module; the audio acquisition module comprises a first microphone, a switching module and a second microphone connected with the switching module;
the baseband module is used for receiving an original voice signal and sending the original voice signal to the audio processing module;
the audio processing module is used for processing the original voice signal to obtain an analog audio signal;
the audio output module is used for playing audio according to the analog audio signal;
the first microphone and the second microphone are used for collecting MIC voice;
the MIC diagnosis module is used for carrying out fault diagnosis according to the MIC voice and the original voice signal, judging whether the first microphone works normally or not and outputting a diagnosis signal;
the MCU is used for outputting a control signal according to the diagnosis signal and controlling the switching module to connect the second microphone into an audio acquisition channel;
the audio processing module is used for processing the MIC voice to obtain a digital MIC voice signal and sending the digital MIC voice signal to the baseband module.
The basic scheme is provided with a baseband module, an audio processing module, an MIC diagnosis module, an MCU, an audio acquisition module and an audio output module, a remote information processing system with TBOX call faults and automatic recovery is built, based on double guarantee of a first microphone and a second microphone, the MIC diagnosis module is set to carry out fault diagnosis on a main MIC (first microphone) and judge whether the main MIC works normally or not, and then the main MIC is automatically switched to a standby MIC (second microphone) to carry out call when damaged, so that the TBOX emergency call function is effectively guaranteed.
In a further embodiment, the MIC diagnostic module includes a first signal processing unit, a second signal processing unit connected to the first signal processing unit, a first adding unit, a second adding unit, and a logic judging module, where the second adding unit is connected to the second signal processing unit, the first adding unit, and the logic judging module;
the first signal processing unit is used for carrying out delay phase and gain control processing on the analog voice signal to obtain a first output signal;
the first adding unit is used for processing the acquired MIC voice according to the first output signal to obtain a second output signal;
the second signal processing unit is used for performing delay phase and gain control processing on the first output signal to obtain a third output signal;
the second adding unit is used for processing the second output signal and the third output signal to obtain a fourth output signal;
the logic judging module is used for judging whether the first microphone works normally or not and outputting a diagnosis signal to the MCU according to preset logic and the fourth output signal.
In a further embodiment, the logic determination module detects a signal amplitude of the fourth output signal, determines that the first microphone is damaged if the signal amplitude is always 0, and determines that the first microphone works normally if the signal amplitude is not always 0.
The first signal processing unit, the second signal processing unit connected with the first signal processing unit, the first adding unit, the second adding unit and the logic judging module are arranged in the scheme, the collected MIC voice and analog voice signals are subjected to signal processing, the signal amplitude state of a fourth output signal obtained through identification processing is judged according to preset logic, whether the first microphone works normally or not is effectively judged, diagnostic signals are output, and therefore fault detection is completed.
In a further embodiment, the switching module comprises an audio switching module, and a first power supply unit, a second power supply unit, a first isolation unit and a second isolation unit which are connected with the audio switching module; the first power supply unit and the first isolation unit are connected with the first microphone, and the first microphone is connected with the MIC output end through the first isolation unit; the second power supply unit and the second isolation unit are connected with the second microphone; the audio switching module, the first power supply unit and the second power supply unit are connected with the MCU;
when the MCU judges that the first microphone works normally according to the diagnosis signal, the MCU outputs a control signal to control the first power supply unit to supply power to the first microphone;
when the MCU outputs the control signal to connect the second microphone to an audio acquisition channel, the audio switching module responds to the control signal and connects the voice signal of the second microphone to an MIC audio output end; and the second power supply unit responds to the control signal to supply power to the second microphone.
In a further embodiment, the first power supply unit includes a first switching tube, a second switching tube, a third switching tube, a first resistor to a fifth resistor, a first capacitor, and a second capacitor, and when the first switching tube is an NPN triode, the second switching tube and the third switching tube are N-channel MOS tubes:
the base electrode of the first switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the second switching tube, one end of the second resistor and one end of the second capacitor through the fifth resistor; one end of the first resistor is connected with the source electrode of the second switching tube, the other end of the second resistor and the other end of the second capacitor, and the other end of the first resistor is connected with a BOX power supply; the grid electrode of the third switching tube is grounded through a fourth resistor and is also connected with the drain electrode of the second switching tube, the source electrode of the third switching tube is connected with a BOX power supply, and the drain electrode of the third switching tube is connected with the first microphone; the first capacitor and the third resistor are connected in series between the source electrode of the third switching tube and the drain electrode of the second switching tube.
In a further embodiment, the second power supply unit includes a fourth switching tube, a fifth switching tube, a third capacitor, a sixth resistor, a seventh resistor, and a first diode; when the fourth switching tube is an NPN triode and the fifth switching tube is an N-channel MOS tube:
the base electrode of the fourth switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the fifth switching tube, one end of the sixth resistor and one end of the third capacitor through the seventh resistor; the BOX power supply is connected with the source electrode of the fifth switching tube, the other end of the sixth resistor and the other end of the third capacitor; the positive pole of the first diode is connected with the drain electrode of the fifth switch tube, and the negative pole of the first diode is connected with the second microphone.
The scheme is that the first microphone and the second microphone are provided with the corresponding first power supply unit, the second power supply unit, the first isolation unit and the second isolation unit, simple components such as the MOS tube and the triode are adopted, a signal control switch circuit for controlling the output of the BOX power supply is established, when the first microphone works normally, the BOX power supply is controlled to supply power to the first microphone only, the TBOX emergency call function is supported, when the first microphone fails, the power supply to the first microphone is automatically cut off, the power supply to the second microphone is ensured, the stability of the TBOX emergency call function is ensured, and the degree of automation is high.
In a further embodiment, the invention further comprises a host power supply unit connected with the second microphone, and the host power supply unit is used for supplying power to the second microphone if the first microphone works normally or not, and is used for disconnecting power supply if the first microphone works normally;
the host power supply unit comprises a sixth switching tube, a seventh switching tube, an eighth switching tube, eighth to twelfth resistors, a fourth capacitor, a fifth capacitor and a second diode, and when the sixth switching tube is an NPN triode and the seventh switching tube and the eighth switching tube are N-channel MOS tubes:
the base electrode of the sixth switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the seventh switching tube, one end of the tenth resistor and one end of the fifth capacitor through the twelfth resistor; the host power supply is connected with the source electrode of the eighth switching tube, the source electrode of the seventh switching tube, the other end of the tenth resistor and the other end of the fifth capacitor through an eleventh resistor; the grid electrode of the eighth switching tube is grounded through a ninth resistor; the anode of the second diode is connected with the drain electrode of the eighth switching tube, and the cathode of the second diode is connected with the second microphone; and the eighth resistor and the fourth capacitor are connected in series between the source electrode of the eighth switching tube and the drain electrode of the seventh switching tube.
In a further embodiment, the first isolation unit comprises an isolation capacitance and the second isolation unit comprises an isolation capacitance.
The invention also provides a control method of the call voice acquisition system, which adopts the call voice acquisition system and comprises the following steps:
s1, acquiring an original voice signal and MIC voice acquired by a first microphone;
s2, judging whether the first microphone works normally or not according to a preset processing strategy, the original voice signal and the MIC voice, if so, entering the next step, and if not, returning to the step S1;
and S3, connecting a second microphone with the audio acquisition channel, and controlling a BOX power supply to supply power to the second microphone and cut off power supply to the first microphone.
In a further embodiment, the step S2 includes:
s21, performing delay phase and gain control processing on the original voice signal to obtain a first output signal;
s22, carrying out signal addition processing on the first output signal and the MIC voice to obtain a second output signal;
s23, performing delay phase and gain control processing on the first output signal to obtain a third output signal;
s24, carrying out signal addition processing on the second output signal and the third output signal to obtain a fourth output signal;
s25, detecting the signal amplitude of the fourth output signal, judging that the first microphone is damaged to enter the next step if the signal amplitude is 0, otherwise judging that the first microphone works normally and returning to the step S1.
The scheme is provided with a preset processing strategy, an original voice signal and the MIC voice are subjected to effective judgment on whether the first microphone works normally or not, and when the first microphone is judged to be faulty, the second microphone is timely connected with the audio acquisition channel, and the BOX power supply is controlled to supply power to the second microphone and cut off the power supply to the first microphone, so that the MIC automatic diagnosis of TBOX is realized, and the standby MIC is automatically switched to be used for conversation when the main MIC is damaged, and the TBOX emergency conversation function is effectively ensured.
Drawings
Fig. 1 is a system frame diagram of a call voice acquisition system according to an embodiment of the present invention;
FIG. 2 is a flow chart of audio processing of a MIC diagnostic module provided by an embodiment of the present invention;
fig. 3 is a connection relationship diagram of an internal structure of a switching module according to an embodiment of the present invention;
fig. 4 is a hardware circuit diagram of an audio switching module according to an embodiment of the present invention;
FIG. 5 is a hardware circuit diagram of a first power supply unit according to an embodiment of the present invention;
fig. 6 is a hardware circuit diagram of a second power supply unit according to an embodiment of the present invention;
FIG. 7 is a hardware circuit diagram of a host power supply unit according to an embodiment of the present invention;
wherein: the device comprises a baseband module 1, an audio processing module 2, a MIC diagnosis module 33, a first signal processing unit 31, a second signal processing unit 32, a first adding unit 33, a second adding unit 34 and a logic judging module 35; MCU4, audio acquisition module 5, switching module 52, audio switching module 521, first power supply unit 512, second power supply unit 513, first isolation unit 514, second isolation unit 515; a first microphone 51, a second microphone 53; an audio output module 6, a power amplifier 61 and a loudspeaker 62; a host power supply unit 7.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
In the embodiment, as shown in fig. 1, the call voice acquisition system provided by the embodiment of the invention comprises a baseband module 1, an audio processing module 2, an MIC diagnosis module, an MCU4 and an audio acquisition module 5 which are sequentially connected, and an audio output module 6 connected with the audio processing module 2, wherein the audio acquisition module 5 is also connected with the audio acquisition module 5 and the MIC diagnosis module; the audio acquisition module 5 comprises a first microphone 51, a switching module 52 and a second microphone 53 connected with the switching module;
in the present embodiment, the first microphone 51 and the second microphone 53 are used not only for voice recognition of the host computer, but also for acquiring voice in the vehicle when the TBOX is in emergency call.
The baseband module 1 is used for receiving the original voice signal of the TSP server side and sending the original voice signal to the audio processing module 2;
the audio processing module 2 is used for processing the original voice signal to obtain an analog audio signal;
the audio output module 6 is used for playing audio according to the analog audio signal; including a power amplifier 61 and a speaker 62.
The first microphone 51 and the second microphone 53 are used for collecting MIC voice;
the MIC diagnostic module is configured to perform fault diagnosis according to MIC voice and an original voice signal, determine whether the first microphone 51 works normally, and output a diagnostic signal;
the MCU4 is used for outputting a control signal according to the diagnosis signal, and controlling the switching module 52 to connect the second microphone 53 into the audio acquisition channel;
the audio processing module 2 is configured to process MIC voice to obtain a digital MIC voice signal, and send the digital MIC voice signal to the baseband module 1, and then the digital MIC voice signal is sent to the TSP server by the baseband module 1.
In the present embodiment, referring to fig. 2, the mic diagnosis module includes a first signal processing unit 31 and a second signal processing unit 32, a first adding unit 33, and a second adding unit 34, a logic judging module 35 connected thereto, the second adding unit 34 being connected to the second signal processing unit 32, the first adding unit 33, the logic judging module 35;
the first signal processing unit 31 and the second signal processing unit 32 are phase delay and gain units.
A first signal processing unit 31, configured to perform delay phase and gain control processing on an analog voice signal (server_audio) to obtain a first Output signal Output1; at this time, the first Output signal Output1 and MIC voice are 180 ° out of phase.
The first adding unit 33 is configured to process the first Output signal Output1 and the collected MIC voice (i.e. box_mic_audio, for example, after the phone is turned on, control the in-vehicle voice signal collected by the first microphone 51, including the voice of the background seat or/and the voice of the vehicle owner) to obtain a second Output signal Output2;
a second signal processing unit 32, configured to perform delay phase (for example, performing 180 ° phase delay again) and gain control processing on the first Output signal Output1, so as to obtain a third Output signal Output3;
a second adding unit 34, configured to process the second Output signal Output2 and the third Output signal Output3 to obtain a fourth Output signal Output4;
the logic judging module 35 is configured to judge whether the first microphone 51 works normally and Output a diagnostic signal to the MCU4 according to the preset logic and the fourth Output signal Output 4.
In this embodiment, the preset logic is: the signal amplitude of the fourth Output signal Output4 is detected, if the signal amplitude is always 0, the first microphone 51 is judged to be damaged, otherwise, the first microphone 51 is judged to work normally.
In this embodiment, the first signal processing unit 31, the second signal processing unit 32 connected to the first signal processing unit 31, the first adding unit 33, the second adding unit 34, and the logic judging module 35 are provided, perform signal processing on the collected MIC voice and analog voice signals, and judge, identify, according to a preset logic, the signal amplitude state of the fourth output signal obtained by the processing, so as to effectively judge whether the first microphone 51 works normally and output a diagnostic signal, thereby completing fault detection.
In the present embodiment, referring to fig. 3, the switching module 52 includes an audio switching module 521 and a first power supply unit 512, a second power supply unit 513, a first isolation unit 514, and a second isolation unit 515 connected thereto; the first power supply unit 512 and the first isolation unit 514 are connected with the first microphone 51, and the first microphone 51 is connected with the MIC output end through the first isolation unit 514; the second power supply unit 513, the second isolation unit 515 are connected to the second microphone 53; the audio switching module 521, the first power supply unit 512, and the second power supply unit 513 are connected to the MCU 4;
referring to fig. 4, the audio switching module 521 is a channel selection chip U1, and an output end D thereof is fixedly connected to an output end of the MIC, and the first microphone 51 is sequentially connected to the MIC output end through the first isolation unit 514 and the output end D.
When the MCU4 judges that the first microphone 51 works normally according to the diagnosis signal, the output control signal controls the first power supply unit 512 to supply power to the first microphone 51;
when the control signal is output from the MCU4 to connect the second microphone 53 to the audio collection channel, the audio switching module 521 responds to the control signal and connects the voice signal of the second microphone 53 to the MIC audio output terminal; while the second power supply unit 513 supplies power to the second microphone 53 in response to the control signal.
The first isolation unit 514 and the second isolation unit 515 are used for filtering direct current components in MIC voice audio signals received from the first microphone 51 and the second microphone 53.
In this embodiment, referring to fig. 5, the first power supply unit 512 includes a first switching tube Q1, a second switching tube M2, a third switching tube M1, a first resistor R1 to a fifth resistor R5, a first capacitor C1, and a second capacitor C2, and when the first switching tube Q1 is an NPN transistor, the second switching tube M2, and the third switching tube M1 are N-channel MOS tubes:
the base electrode of the first switching tube Q1 is connected with the MCU4, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the second switching tube M2, one end of the second resistor R2 and one end of the second capacitor C2 through a fifth resistor R5; one end of the first resistor R1 is connected with the source electrode of the second switch tube M2, the other end of the second resistor R2 and the other end of the second capacitor C2, and the other end of the first resistor R1 is connected with a BOX power supply (BOX-MIC-PWR); the grid electrode of the third switching tube M1 is grounded through a fourth resistor R4, and is also connected with the drain electrode of the second switching tube M2, the source electrode is connected with a BOX power supply, and the drain electrode is connected with the first microphone 51; the first capacitor C1 and the third resistor C2 are connected in series between the source of the third switching tube M1 and the drain of the second switching tube M1.
In the present embodiment, referring to fig. 6, the second power supply unit 513 includes a fourth switching tube Q2, a fifth switching tube M3, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, and a first diode D1; when the fourth switching tube Q2 is an NPN transistor and the fifth switching tube M3 is an N-channel MOS tube:
the base electrode of the fourth switching tube Q2 is connected with the MCU4, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the fifth switching tube M3, one end of the sixth resistor R6 and one end of the third capacitor C3 through a seventh resistor R7; the BOX power supply is connected with the source electrode of the fifth switch tube M3, the other end of the sixth resistor R6 and the other end of the third capacitor C3; the positive electrode of the first diode D1 is connected to the drain electrode of the fifth switching transistor M3, and the negative electrode is connected to the second microphone 53.
In this embodiment, the first microphone 51 and the second microphone 53 are configured with the corresponding first power supply unit 512, the second power supply unit 513, the first isolation unit 514, and the second isolation unit 515, and simple components such as a MOS transistor and a triode are adopted to establish a signal control switch circuit for controlling the output of the BOX power supply, so that when the first microphone 51 works normally, the BOX power supply is controlled to supply power to the first microphone 51 only, the TBOX emergency call function is supported, and when the first microphone 51 fails, the power supply to the first microphone 51 is automatically cut off, the power supply to the second microphone 53 is ensured, the stability of the TBOX emergency call function is ensured, and the automation degree is high.
In this embodiment, referring to fig. 7, the present invention further includes a host power supply unit 7 connected to the second microphone 53, and when it is determined whether the first microphone 51 is working normally, if yes, the host power supply unit 7 supplies power to the second microphone 53, and if not, the power supply is disconnected;
the host power supply unit 7 includes a sixth switching tube Q3, a seventh switching tube M5, an eighth switching tube M4, eighth resistors R8 to twelfth resistors R12, a fourth capacitor C4, a fifth capacitor C5, and a second diode D2, where when the sixth switching tube Q3 is an NPN transistor, the seventh switching tube M5 and the eighth switching tube M4 are N-channel MOS transistors:
the base electrode of the sixth switching tube Q3 is connected with the MCU4, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the seventh switching tube M5, one end of the tenth resistor R10 and one end of the fifth capacitor C5 through a twelfth resistor R12; the host power supply (HUT-MIC-PWR) is connected with the source electrode of the eighth switching tube M4, the source electrode of the seventh switching tube M5, the other end of the tenth resistor R10 and the other end of the fifth capacitor C5 through an eleventh resistor R11; the grid electrode of the eighth switching tube M4 is grounded through a ninth resistor R9; the anode of the second diode D2 is connected with the drain electrode of the eighth switching tube M4, and the cathode of the second diode D2 is connected with the second microphone 53; the eighth resistor R8 and the fourth capacitor C4 are connected in series between the source of the eighth switching tube M4 and the drain of the seventh switching tube M5.
In this embodiment, the first isolation unit 514 includes an isolation capacitor C6, and the second isolation unit 515 includes an isolation capacitor C7.
In this embodiment, the switching principle of the vehicle-mounted microphone is as follows:
the MCU4 detects the signal amplitude of the fourth output signal, if the first microphone 51 is judged to work normally, the control signal BOX_MCU4_CTRL received by the control signal input end is at a low level, at the moment, the switching tubes M2, M5 and M3 are disconnected, the switching tubes M1 and M4 are conducted, the first microphone 51 is powered by a TBOX power supply, and the second microphone 53 is powered by the host power supply unit 7; while SELECT of the audio switching module 521 is low, its output D is connected to S2 (floating) and audio from the second microphone 53 is not input to TBOX.
When the MCU4 detects that the signal amplitude of the fourth output signal is always 0, it is determined that the first microphone 51 is damaged, the control signal box_mct4_ctrl received by the control signal input terminal is at a high level, at this time, the switching transistors M2, M5 and M3 are turned on, the switching transistors M1 and M4 are turned off, the power supply of the first microphone 51 is turned off, and the second microphone 53 is powered by the TBOX power supply; meanwhile, the SELECT of the audio switching module 521 is at a high level, the output terminal D thereof is connected to S1, and the audio of the second microphone 53 is input to TBOX, so as to implement normal call.
The embodiment of the invention is provided with the baseband module 1, the audio processing module 2, the MIC diagnosis module, the MCU4, the audio acquisition module 5 and the audio output module 6 to form a remote information processing system with the automatic recovery of TBOX call faults, and the MIC diagnosis module is arranged to carry out fault diagnosis on a main MIC (first microphone 51) based on double guarantee of the first microphone 51 and the second microphone 53 to judge whether the main MIC works normally or not, so that the main MIC is automatically switched to a standby MIC (second microphone 53) to carry out call when damaged, and the TBOX emergency call function is effectively ensured.
Example 2
The embodiment of the invention also provides a control method of the call voice acquisition system, which adopts the call voice acquisition system provided by the embodiment, and comprises the following steps of S1-S3:
s1, acquiring an original voice signal and MIC voice acquired by a first microphone 51;
s2, judging whether the first microphone 51 works normally or not according to a preset processing strategy, an original voice signal and MIC voice, if so, entering the next step, and if not, returning to the step S1, wherein the steps comprise the steps S21-S25:
s21, performing delay phase and gain control processing on an original voice signal to obtain a first output signal;
s22, carrying out signal addition processing on the first output signal and MIC voice to obtain a second output signal;
s23, performing delay phase and gain control processing on the first output signal to obtain a third output signal;
s24, carrying out signal addition processing on the second output signal and the third output signal to obtain a fourth output signal;
s25, detecting the signal amplitude of the fourth output signal, if the signal amplitude is always 0, judging that the first microphone 51 is damaged to enter the next step, otherwise, judging that the first microphone 51 works normally and returning to the step S1.
And S3, connecting the second microphone 53 with the audio acquisition channel, and controlling the BOX power supply to supply power to the second microphone 53 and cut off power supply to the first microphone 51.
The preset processing strategy is set in the embodiment, so that whether the first microphone 51 works normally or not is effectively judged for the original voice signal and MIC voice, and when the first microphone 51 is judged to be faulty, the second microphone 53 is timely connected with the audio acquisition channel, the BOX power supply is controlled to supply power to the second microphone 53, the power supply to the first microphone 51 is cut off, and therefore MIC automatic diagnosis of TBOX is achieved, and when the main MIC is damaged, the standby MIC is automatically switched to carry out conversation, and the TBOX emergency conversation function is effectively guaranteed.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (9)

1. A conversation voice acquisition system is characterized in that: the system comprises a baseband module, an audio processing module, a MIC diagnosis module, an MCU and an audio acquisition module which are sequentially connected, and an audio output module connected with the audio processing module, wherein the audio acquisition module is also connected with the audio acquisition module and the MIC diagnosis module; the audio acquisition module comprises a first microphone, a switching module and a second microphone connected with the switching module;
the baseband module is used for receiving an original voice signal and sending the original voice signal to the audio processing module;
the audio processing module is used for processing the original voice signal to obtain an analog audio signal;
the audio output module is used for playing audio according to the analog audio signal;
the first microphone and the second microphone are used for collecting MIC voice;
the MIC diagnosis module is used for carrying out fault diagnosis according to the MIC voice and the original voice signal, judging whether the first microphone works normally or not and outputting a diagnosis signal;
the MCU is used for outputting a control signal according to the diagnosis signal and controlling the switching module to connect the second microphone into an audio acquisition channel;
the audio processing module is used for processing the MIC voice to obtain a digital MIC voice signal and sending the digital MIC voice signal to the baseband module;
the MIC diagnosis module comprises a first signal processing unit, a second signal processing unit, a first addition unit, a second addition unit and a logic judgment module, wherein the second signal processing unit, the first addition unit and the logic judgment module are connected with the first signal processing unit, the second addition unit and the logic judgment module;
the first signal processing unit is used for carrying out delay phase and gain control processing on the analog voice signal to obtain a first output signal;
the first adding unit is used for processing the acquired MIC voice according to the first output signal to obtain a second output signal;
the second signal processing unit is used for performing delay phase and gain control processing on the first output signal to obtain a third output signal;
the second adding unit is used for processing the second output signal and the third output signal to obtain a fourth output signal;
the logic judging module is used for judging whether the first microphone works normally or not and outputting a diagnosis signal to the MCU according to preset logic and the fourth output signal.
2. A conversational speech acquisition system according to claim 1, wherein: the logic judging module detects the signal amplitude of the fourth output signal, judges that the first microphone is damaged if the signal amplitude is always 0, and judges that the first microphone works normally if the signal amplitude is not always 0.
3. A conversational speech acquisition system according to claim 1, wherein: the switching module comprises an audio switching module, a first power supply unit, a second power supply unit, a first isolation unit and a second isolation unit which are connected with the audio switching module; the first power supply unit and the first isolation unit are connected with the first microphone, and the first microphone is connected with the MIC output end through the first isolation unit; the second power supply unit and the second isolation unit are connected with the second microphone; the audio switching module, the first power supply unit and the second power supply unit are connected with the MCU;
when the MCU judges that the first microphone works normally according to the diagnosis signal, the MCU outputs a control signal to control the first power supply unit to supply power to the first microphone;
when the MCU outputs the control signal to connect the second microphone to an audio acquisition channel, the audio switching module responds to the control signal and connects the voice signal of the second microphone to an MIC audio output end; and the second power supply unit responds to the control signal to supply power to the second microphone.
4. A telephony voice acquisition system as claimed in claim 3, wherein: the first power supply unit comprises a first switching tube, a second switching tube, a third switching tube, first to fifth resistors, a first capacitor and a second capacitor, and when the first switching tube is an NPN triode, the second switching tube and the third switching tube are N-channel MOS tubes:
the base electrode of the first switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the second switching tube, one end of the second resistor and one end of the second capacitor through the fifth resistor; one end of the first resistor is connected with the source electrode of the second switching tube, the other end of the second resistor and the other end of the second capacitor, and the other end of the first resistor is connected with a BOX power supply; the grid electrode of the third switching tube is grounded through a fourth resistor and is also connected with the drain electrode of the second switching tube, the source electrode of the third switching tube is connected with a BOX power supply, and the drain electrode of the third switching tube is connected with the first microphone; the first capacitor and the third resistor are connected in series between the source electrode of the third switching tube and the drain electrode of the second switching tube.
5. A telephony voice acquisition system as claimed in claim 4, wherein: the second power supply unit comprises a fourth switching tube, a fifth switching tube, a third capacitor, a sixth resistor, a seventh resistor and a first diode; when the fourth switching tube is an NPN triode and the fifth switching tube is an N-channel MOS tube:
the base electrode of the fourth switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the fifth switching tube, one end of the sixth resistor and one end of the third capacitor through the seventh resistor; the BOX power supply is connected with the source electrode of the fifth switching tube, the other end of the sixth resistor and the other end of the third capacitor; the positive pole of the first diode is connected with the drain electrode of the fifth switch tube, and the negative pole of the first diode is connected with the second microphone.
6. A conversational speech acquisition system according to claim 1, wherein: the system also comprises a host power supply unit connected with the second microphone, and is used for judging whether the first microphone works normally or not, if so, the host power supply unit supplies power to the second microphone, and if not, the host power supply unit cuts off power supply;
the host power supply unit comprises a sixth switching tube, a seventh switching tube, an eighth switching tube, eighth to twelfth resistors, a fourth capacitor, a fifth capacitor and a second diode, and when the sixth switching tube is an NPN triode and the seventh switching tube and the eighth switching tube are N-channel MOS tubes:
the base electrode of the sixth switching tube is connected with the MCU, the emitter electrode is grounded, and the collector electrode is connected with the grid electrode of the seventh switching tube, one end of the tenth resistor and one end of the fifth capacitor through the twelfth resistor; the host power supply is connected with the source electrode of the eighth switching tube, the source electrode of the seventh switching tube, the other end of the tenth resistor and the other end of the fifth capacitor through an eleventh resistor; the grid electrode of the eighth switching tube is grounded through a ninth resistor; the anode of the second diode is connected with the drain electrode of the eighth switching tube, and the cathode of the second diode is connected with the second microphone; and the eighth resistor and the fourth capacitor are connected in series between the source electrode of the eighth switching tube and the drain electrode of the seventh switching tube.
7. A telephony voice acquisition system as claimed in claim 3, wherein: the first isolation unit comprises an isolation capacitor, and the second isolation unit comprises an isolation capacitor.
8. A method for controlling a call voice acquisition system, characterized by adopting a call voice acquisition system according to any one of claims 1 to 7, comprising the steps of:
s1, acquiring an original voice signal and MIC voice acquired by a first microphone;
s2, judging whether the first microphone works normally or not according to a preset processing strategy, the original voice signal and the MIC voice, if so, entering the next step, and if not, returning to the step S1;
and S3, connecting a second microphone with the audio acquisition channel, and controlling a BOX power supply to supply power to the second microphone and cut off power supply to the first microphone.
9. The method for controlling a call voice acquisition system according to claim 8, wherein the step S2 includes:
s21, performing delay phase and gain control processing on the original voice signal to obtain a first output signal;
s22, carrying out signal addition processing on the first output signal and the MIC voice to obtain a second output signal;
s23, performing delay phase and gain control processing on the first output signal to obtain a third output signal;
s24, carrying out signal addition processing on the second output signal and the third output signal to obtain a fourth output signal;
s25, detecting the signal amplitude of the fourth output signal, judging that the first microphone is damaged to enter the next step if the signal amplitude is 0, otherwise judging that the first microphone works normally and returning to the step S1.
CN202210096496.1A 2022-01-26 2022-01-26 Call voice acquisition system and control method thereof Active CN114630235B (en)

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