WO2022021633A1 - 远距离声音放大方法、存储介质及智能设备 - Google Patents
远距离声音放大方法、存储介质及智能设备 Download PDFInfo
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- WO2022021633A1 WO2022021633A1 PCT/CN2020/123687 CN2020123687W WO2022021633A1 WO 2022021633 A1 WO2022021633 A1 WO 2022021633A1 CN 2020123687 W CN2020123687 W CN 2020123687W WO 2022021633 A1 WO2022021633 A1 WO 2022021633A1
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- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 143
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- 230000005236 sound signal Effects 0.000 claims abstract description 240
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000004590 computer program Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000002596 correlated effect Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 description 29
- 230000000694 effects Effects 0.000 description 9
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Classifications
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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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/002—Control of digital or coded signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
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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
- H04R2410/00—Microphones
- H04R2410/01—Noise reduction using microphones having different directional characteristics
Definitions
- the present application relates to the technical field of signal processing, and in particular, to a long-distance sound amplification method, a storage medium and a smart device.
- the main purpose of this application is to provide a long-distance sound amplification method, a storage medium and an intelligent device, which can solve the problem of difficult monitoring when monitoring a remote sound signal.
- the present application proposes a long-distance sound amplification method, comprising the following steps:
- the first sound pickup device and the second sound pickup device have the same ability to obtain sound, the first sound pickup device and the second sound pickup device.
- the sound pickup devices are arranged side by side, the distance between the first sound pickup device and the second sound pickup device is within a preset distance range, the sound pickup of the first sound pickup device is positive and the sound pickup of the second sound pickup device is forward. The included angle between them is within the preset angle range;
- Volume control and power amplification are performed on the second differentially amplified sound signal to obtain an output sound signal.
- the steps include:
- the feedback voltage is obtained by comparing the peak value of the first differentially amplified sound signal obtained after the adjustable gain amplification process at the last time with the peak value of the first sound amplified signal obtained at the last time;
- the feedback signal is generated according to the feedback voltage, and the feedback signal is used to control the amplification gain of the adjustable gain amplification, and the amplification gain is positively correlated with the amplitude of the feedback voltage.
- the steps include:
- a gain control signal is obtained, the gain control signal is used to control the amplification gain of the adjustable gain amplification, and the gain control signal is generated by a user-controlled preset manual gain control circuit.
- the second differentially amplified sound signal is subjected to digital noise reduction processing.
- the present application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the above-mentioned remote sound amplification method is implemented.
- the present application also proposes an intelligent device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the above-mentioned remote sound amplification method when the computer program is executed.
- the present application also proposes a long-distance sound amplification system, including:
- a first sound pickup device for acquiring first sound information
- the second sound pickup device is used to obtain second sound information.
- the first sound pickup device and the second sound pickup device have the same ability to obtain sound, and the separation distance between the first sound pickup device and the second sound pickup device is preset. Within the range, the first sound pickup device and the second sound pickup device are arranged side by side facing the target position point of the sound to be collected, the distance between the first sound pickup device and the second sound pickup device, and the sound pickup direction of the first sound pickup device and the sum.
- the included angle between the sound pickup positive directions of the second sound pickup device is adjustable;
- an amplification device connected to the first sound pickup device, for filtering and amplifying the first sound information to obtain the first sound amplification signal
- a first differential amplifier connected to the first sound pickup device and the second sound pickup device, for performing differential amplification processing on the first sound information and the second sound information to obtain a first differentially amplified sound signal
- an adjustable gain amplifier connected to the first differential amplifier, for performing adjustable gain amplification processing on the first differentially amplified sound signal
- the second differential amplifier is connected to the amplifying device and the adjustable gain amplifier, and is used for performing differential amplification processing on the first differentially amplified sound signal amplified by the adjustable gain and the first sound amplified signal to obtain the second differentially amplified sound signal;
- the sound processor is connected to the second differential amplifier, and is used for performing volume control and power amplification on the second differentially amplified sound signal to obtain an output sound signal.
- the long-distance sound amplification system also includes:
- the peak comparator is connected to the adjustable gain amplifier and the amplifying device, and is used to compare the peak value of the first differentially amplified sound signal obtained after the adjustable gain amplification processing at the last time with the peak value of the first sound amplified signal obtained at the last time.
- the feedback voltage is obtained by comparison, and a feedback signal is generated according to the feedback voltage, and the feedback signal is sent to the adjustable gain amplifier, the feedback signal is used to adjustably control the amplification gain of the adjustable gain amplifier, and the amplification gain is positively related to the amplitude of the feedback voltage .
- the long-distance sound amplification system also includes:
- a manual gain control circuit connected with the adjustable gain amplifier, is used to convert the manual control action into a gain control signal, and sends the gain control signal to the adjustable gain amplifier, and the gain control signal is used to control the amplification of the adjustable gain amplifier gain.
- the amplifying device is a bandpass amplifier.
- first sound pickup device and the second sound pickup device are directional pickups.
- the distance between the first sound pickup device and the second sound pickup device is between 0.3m-1.0m.
- the first sound pickup device is fixed on the frame
- the sound pickup forward angle of the second sound pickup device is adjustable
- the sound pickup forward direction of the first sound pickup device is between the sound pickup forward direction of the second sound pickup device.
- the included angle is between ⁇ 30 degrees.
- the long-distance sound amplifying method, storage medium and intelligent device of the present application realizes high-direction and long-distance monitoring, and ensures that when monitoring the sound facing in the distance, it will not be covered by the near sound, thereby It solves the problem that the monitoring is difficult when monitoring the remote sound signal.
- Fig. 1 is a schematic diagram of the steps in the first embodiment of the remote sound amplification method of the present application
- FIG. 2 is a schematic structural diagram of an embodiment of a remote sound amplifying device of the present application
- FIG. 3 is a schematic structural diagram of an embodiment of a storage medium of the present application.
- FIG. 4 is a schematic structural diagram of an embodiment of a smart device of the present application.
- FIG. 5 is a schematic diagram of the structure and signal transmission of an embodiment of the remote sound amplification system of the present application.
- an embodiment of the method for amplifying long-distance sound of the present application includes the following steps:
- the first sound pickup device 1 and the second sound pickup device 2 have the same ability to obtain sound.
- the sound pickup device and the second sound pickup device are arranged side by side, the distance between the first sound pickup device and the second sound pickup device is within a preset distance range, and the sound pickup of the first sound pickup device is positive and the second sound pickup device.
- the included angle between the pickup directions of the device is within the preset angle range;
- the first sound information and the second sound information respectively include the sound signal in the near non-center direction, the near The sound signal in the middle direction and the sound signal in the distance;
- the first sound pickup device 1 and the second sound pickup device 2 are directional pickups, and the first sound pickup device 1 and the second sound pickup device 2 have the same ability to acquire sound,
- the purpose is to ensure that the first sound pickup device 1 and the second sound pickup device 2 can obtain the same/similar sound information when the positions are the same/similar, and make the subsequent cancellation of the same/similar sound signals, convenient.
- Similar sound information means that the content, intensity and frequency of the sound information obtained by the first sound pickup device 1 and the second sound pickup device 2 are close to the same;
- the two sound pickup devices 2 are preferably the same device to ensure that the first sound pickup device 1 and the second sound pickup device 2 have the same ability to acquire sound; by adjusting the distance between the first sound pickup device 1 and the second sound pickup device 2 Monitoring can be performed for different listening distances. When the distance between the first sound pickup device 1 and the second sound pickup device 2 is larger, the monitoring distance is farther; when the first sound pickup device 1 and the second sound pickup device 2 are set in parallel In the subsequent steps, the sound signal in the near center direction of the two sound pickup devices may mask the sound signal in the far center direction.
- far and near are relative concepts, which are the distance between the detected sound source and the first sound pickup device 1, and the distance between the detected sound source and the detected sound.
- the sound source is related to the distance between the second sound pickup device 2. The farther the distance is, the greater the range of the far and near ones.
- the first sound pickup device 1 and the second sound pickup device 2 are set at intervals, so The sound information obtained by the two sound pickup devices is different; by presetting the separation distance range between the first sound pickup device 1 and the second sound pickup device 2, the applicable distance range of the long-distance sound amplification method can be controlled; To obtain sound information, adjust the angle between the sound pickup direction of the first sound pickup device 1 and the sound pickup forward direction of the second sound pickup device 2; wherein, the preset interval distance range is a preset range value, For example, 0.3m-1m, the preset included angle range is a preset range value, such as ⁇ 30 degrees; the first sound pickup device and the second sound pickup device are arranged side by side facing the target position of the sound to be collected.
- the separation distance between the first sound pickup device and the second sound pickup device is small, when the first sound pickup device and the second sound pickup device are far away from the target location point, the first sound pickup device and the second sound pickup device are far away from the target location.
- the position difference of the devices can be ignored, so that in the first sound pickup device 1 and the second sound pickup device 2, the distance between the position of the sound collection device (such as a microphone) inside the two and the target position of the sound to be collected is almost the same. equal.
- the sound acquisition surfaces of the first sound pickup device 1 and the second sound pickup device 2 are on the same plane, and the distance from the target position of the sound to be collected to the sound acquisition surfaces of the first sound pickup device 1 and the second sound pickup device 2 Almost the same, the first sound pickup device 1 and the second sound pickup device 2 do not produce front and rear dislocation; of course, when the target position point of the sound to be collected is far enough away from the sound acquisition surface The slight error between the positions of the pickup device 2 can be ignored; the sound pickup direction of the first sound pickup device 1 refers to the orientation of the microphone used for collecting external sound signals on the first sound pickup device 1, and the The sound pickup direction refers to the orientation of the microphone on the second sound pickup device 2 for collecting external sound signals.
- the amplifying device 5 is a band-pass amplifier.
- the function of the band-pass amplifier is to filter and amplify the sound signal with a low volume in the front and a certain number of times (for example, several hundred times), and reserve the 200HZ ⁇ 2KHZ sound signal, and filter out low-frequency wind noise, vibration noise and higher-frequency non-voice signals that are prone to whistling; the first differentially amplified sound signal retains the near non-central sound signal; the first The microphone on the sound pickup device 1 for collecting external sound signals points straight ahead, and the microphone on the second sound pickup device 2 for collecting external sound signals points at a forward angle of ⁇ 30 degrees, and the specific angle range is adjustable.
- the intensity and phase when they reach the two sound pickup devices can be considered to be approximate. Therefore, only the sound signal in the near non-center direction is output by the first differential amplifier 3; in other embodiments, the above step S2 is implemented by software, the first sound amplification signal is a digital signal, and the first sound information and all The second sound information is subjected to digital analog processing, converted into a digital signal, and then subjected to differential amplification processing, so that the obtained first differentially amplified sound signal is a digital signal.
- the first differentially amplified sound signal is gain-amplified by the adjustable gain amplifier 4, preferably, the peak value of the first differentially amplified sound signal after gain amplification is the same as the first sound amplified signal.
- the peak values of are nearly the same, and the almost same peak value is conducive to mutual cancellation of the sound signals; in other embodiments, the above step S3 is implemented by software, and the first differentially amplified sound signal is a digital signal.
- the gain-amplified first differentially amplified sound signal and the first differentially amplified sound signal are differentially amplified by the second differential amplifier 6 to obtain a second differentially amplified sound signal.
- the second differentially amplified sound signal the sound signal in the near non-central direction is completely or partially canceled, and the sound signal in the far distance and the sound signal in the middle direction of the first sound pickup device 1 and the second sound pickup device 2 are retained. If there is no sound signal near the front, it is possible to make the signal far in front of the far greater than the near signal, so as to realize high-direction and long-distance monitoring; in other embodiments, the above step S4 is implemented by software, and the first differential amplifies the sound signal. and the first sound amplification signal is a digital signal.
- step S5 in some embodiments, after the sound processor 8 performs volume control and power amplification on the second differentially amplified sound signal, the frequency of the output sound signal is within the sound frequency range that can be heard by the human ear, Therefore, the output sound signal can be used for monitoring or recording; in other embodiments, the above step S5 is implemented by software, wherein the second differentially amplified sound signal is a digital signal.
- the long-distance sound amplifying method obtains the first sound information and the second sound information in the same direction through the first sound pickup device 1 and the second sound pickup device 2 respectively, and the first sound information and the second sound information through the first differential amplifier 3.
- Differential amplification to the greatest extent possible to eliminate the sound signal in the long distance in front and the sound signal just in the middle position in front of the two pickups, and keep the sound signal in the near non-central direction, that is, the first differential amplified sound signal, through the adjustable gain amplifier. 4.
- the problem of difficulty in monitoring existing when monitoring the far-end sound signal is solved.
- performing differential amplification processing on the first differentially amplified sound signal amplified by the adjustable gain and the first differentially amplified sound signal to obtain the second differentially amplified sound signal, before step S4, includes:
- steps S401-S402 is all implemented by the peak comparator 7, the feedback signal is sent to the adjustable gain amplifier 4, and the gain of the adjustable gain amplifier 4 is controlled by the feedback signal.
- steps S401-S402 are implemented by software, wherein the first differentially amplified sound signal of the previous time and the first amplified sound signal of the previous time are compared with each other.
- the obtained difference value and feedback signal are both digital signals; wherein, the last time refers to the fact that the first differentially amplified sound signal reaches the second differential amplifier 6 and the feedback signal obtained by the first differentially amplified sound signal of the adjustable gain amplifier 4 is generated. phase delay.
- performing differential amplification processing on the first differentially amplified sound signal amplified by the adjustable gain and the first differentially amplified sound signal to obtain the second differentially amplified sound signal before step S4 includes:
- the step S403 is realized by the manual gain control circuit 9, and the gain control signal is sent to the adjustable gain amplifier 4, which can realize the manual adjustment of the gain, so that the user can manually adjust the near sound.
- Cancellation effect for example, when the button is manually rotated, the manual gain control circuit 9 will generate a gain control signal, and then control the amplification gain of the adjustable gain amplifier 4, so the cancellation effect of the near sound signal in step S4 is also affected.
- the above step S403 is implemented by software, wherein the gain control signal is a digital signal.
- the power amplifying process before the step S5 of obtaining the output sound signal, includes:
- step S501 it is applied to the situation that steps S1-S4 are processed by hardware, and the second differentially amplified sound signal is subjected to digital noise reduction processing by the signal processor.
- Noise reduction processing can eliminate some noise, which is better when monitoring.
- the average sound pressure level measured at a distance of 1 meter from the sound source is 66dB when a person is speaking normally (note: the average average value is 65 ⁇ 69dB). If the attenuation of atmospheric absorption, ground effect attenuation, leaves and other obstacles is not considered and other factors, the sound pressure attenuation at a distance of 101 meters from a person is 40dB, that is, the average sound pressure measured is 26 dB (actually it will be lower). If the sound exceeds 26 dB, the human ear cannot hear the normal speech of a person 100 meters away.
- the sound pressure of 26 dBSPL will be converted into an electrical signal by the sound pickup device and the output will be about 4uV. 0.8mV, but the sound signal of normal speech near the sound pickup device is converted dozens of times larger, and will become several mV ⁇ 80mV after being amplified by 200 times.
- the first differential amplifier 3 outputs only the near non-central sound signal, and the purpose of using the adjustable gain amplifier 4 is the near non-central direction.
- the first differentially amplified sound signal is gain-amplified close to the output of the amplifying device 5 so as to be mostly canceled in the second differential amplifier 6, while preserving the distant sound signal and preserving the first sound pickup device 1 and the second sound pickup device 2.
- the sound signal in the middle direction realizes high-direction long-distance monitoring. Therefore, the maximum gain of the adjustable gain amplifier 4 should be higher than the fixed gain of the amplifying device 5 (recommended 200 ⁇ 300 times).
- the purpose of setting the manual gain control circuit 9 is that the user can manually adjust the cancellation effect of the near sound signal, which is equivalent to adjusting the monitoring of the near sound or the far sound.
- the sound signal in front of the near will also cover up the sound signal in the distance. If you don't want it to cover up the sound signal in the distance, you can fine-tune the angle of the second sound pickup device 2, so that the first differential amplifier 3 can respond to the first sound
- the output of the sound signal in the middle direction of the pickup device 1 and the second sound pickup device 2 is not 0, which can also cancel out most of the sound signals in the immediate front.
- the output of the second differential amplifier 6 can also undergo analog-to-digital conversion and then perform digital noise reduction processing of the sound, so that the monitoring effect is better after removing some noise.
- first sound pickup device 1 and the second sound pickup device 2 can also use different sound pickup devices.
- the structure is not specifically limited, but the working parameters of the devices are required to be as consistent as possible to ensure that the first sound pickup device 1 and the second sound pickup device.
- the ability of the sound pickup device 2 to acquire sound signals is the same.
- the distance between the first sound pickup device 1 and the second sound pickup device 2 is related to the target distance to be monitored. The farther the target distance is, the farther the distance between the first sound pickup device 1 and the second sound pickup device 2 is, and vice versa, the closer the distance is.
- the first sound pickup device 1 and the second sound pickup device 2 can overlap, that is There is only one first sound pickup device 1 or second sound pickup device 2, the amplitude of the output signal of the first differential amplifier 3 is approximately 0, and the sound signal near the output of the second differential amplifier 6 has no cancellation effect. If there is a sound signal, the sound signal in the distance cannot be heard.
- the present application also proposes a long-distance sound amplifying device, comprising:
- a sound acquisition module 01 is used to continuously acquire the first sound information through the first sound pickup device and obtain the second sound information through the second sound pickup device.
- the first sound pickup device and the second sound pickup device have the same ability to acquire sound.
- a sound pickup device and a second sound pickup device are arranged side by side, the distance between the first sound pickup device and the second sound pickup device is within a preset distance range, the sound pickup of the first sound pickup device is positive and the second sound pickup The included angle between the sound pickup directions of the pickup device is within the preset angle range;
- the first differential processing module 02 is used for filtering and amplifying the first sound information to obtain a first sound amplification signal, and performing differential amplification processing on the first sound information and the second sound information to obtain a first differentially amplified sound signal ;
- the adjustable gain module 03 is used to amplify the first differentially amplified sound signal with adjustable gain
- the second differential processing module 04 is configured to perform differential amplification processing on the first differentially amplified sound signal amplified by the adjustable gain and the first differentially amplified sound signal to obtain a second differentially amplified sound signal;
- the amplifying module 05 is configured to perform volume control and power amplification on the second differentially amplified sound signal to obtain an output sound signal.
- the remote sound amplifying device also includes:
- the feedback voltage acquisition module is used to compare the peak value of the first differential amplified sound signal obtained after the adjustable gain amplification process at the last time with the peak value of the first sound amplified signal obtained at the last time to obtain the feedback voltage;
- the feedback module is used to generate a feedback signal according to the feedback voltage, the feedback signal is used to control the amplification gain of the adjustable gain amplification, and the amplification gain is positively correlated with the amplitude of the feedback voltage.
- the remote sound amplifying device also includes:
- the manual control signal generation module is used to obtain the gain control signal, the gain control signal is used to control the amplification gain of the adjustable gain amplification, and the gain control signal is generated by the user-controlled preset manual gain control circuit.
- the remote sound amplifying device also includes:
- the data conversion module is used to perform digital noise reduction processing on the second differentially amplified sound signal.
- an embodiment of the present application further proposes a storage medium 100, which is a computer-readable storage medium, and stores a computer program 200 thereon.
- a storage medium 100 which is a computer-readable storage medium, and stores a computer program 200 thereon.
- the computer program 200 is executed, the long-distance sound in any of the above-mentioned embodiments is realized. zoom method.
- an embodiment of the present application further proposes a smart device 300 , which includes a memory 400 , a processor 500 , and a computer program 200 stored in the memory 400 and running on the processor 500 , when the processor 500 executes the computer program 200
- a smart device 300 which includes a memory 400 , a processor 500 , and a computer program 200 stored in the memory 400 and running on the processor 500 , when the processor 500 executes the computer program 200
- the long-distance sound amplification method in any of the above embodiments is implemented.
- the smart device 300 in this embodiment of the present application is the above-mentioned device for executing one or more of the methods in the present application.
- These devices may be specially designed and manufactured for the required purposes, or they may include those known in general purpose computers.
- These devices have computer programs 200 or application programs stored therein, which computer programs 200 are selectively activated or reconfigured.
- Such computer program 200 may be stored in a device (eg, computer) readable medium including, but not limited to, any type of medium suitable for storing electronic instructions and coupled to a bus, respectively disks (including floppy disks, hard disks, CD-ROMs, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card.
- a readable medium includes any medium that stores or transmits information in a form that can be read by a device (eg, a computer).
- the present application also proposes a long-distance sound amplification system, including:
- a first sound pickup device 1 for acquiring first sound information
- the second sound pickup device 2 is used to obtain second sound information.
- the first sound pickup device 1 and the second sound pickup device 2 have the same ability to obtain sound signals.
- the separation distance is within the preset range, the first sound pickup device 1 and the second sound pickup device 2 are arranged side by side facing the target position point of the sound to be collected, and the distance between the first sound pickup device 1 and the second sound pickup device 2 and the first sound pickup device 2.
- the angle between the sound pickup forward direction of a sound pickup device 1 and the sound pickup forward direction of the second sound pickup device 2 is adjustable;
- an amplification device 5 connected to the first sound pickup device 1, for filtering and amplifying the first sound information to obtain a first sound amplification signal;
- the first differential amplifier 3 connected with the first sound pickup device 1 and the second sound pickup device 2, is used to differentially amplify the first sound information and the second sound information to obtain a first differentially amplified sound signal, and the first differentially amplified sound
- the sound signal in the near non-center direction is reserved in the sound signal;
- the adjustable gain amplifier 4 is connected to the first differential amplifier 3, and is used for performing adjustable gain amplification processing on the first differentially amplified sound signal. so that the peak value of the first differentially amplified sound signal after gain amplification is approximately the same as the peak value of the first sound amplified signal;
- the second differential amplifier 6 is connected to the amplifying device 5 and the adjustable gain amplifier 4, and is used for performing differential amplification processing on the first differentially amplified sound signal amplified by the adjustable gain and the first sound amplified signal to obtain the second differentially amplified sound signal, in the second differentially amplified sound signal, the sound signal in the near non-central direction is completely or partially canceled, and the far sound signal and the sound signal in the middle direction of the first sound pickup device 1 and the second sound pickup device 2 are retained;
- the sound processor 8 connected to the second differential amplifier 6, is used for performing volume control and power amplification on the second differentially amplified sound signal to obtain an output sound signal.
- the first sound pickup device 1 and the second sound pickup device 2 are directional pickups, and the first sound pickup device 1 and the second sound pickup device 2 acquire sound
- the purpose is to ensure that the first sound pickup device and the second sound pickup device can obtain the same/similar sound information when the positions are the same/close, so that the subsequent implementation of the same/similar sound signals Cancellation is convenient to obtain the target sound signal required by the user; similar sound information means that the content, intensity and frequency of the sound information obtained by the first sound pickup device 1 and the second sound pickup device 2 are close to the same;
- the first sound pickup device 1 and the second sound pickup device 2 are preferably the same device to ensure that the first sound pickup device 1 and the second sound pickup device 2 have the same ability to acquire sound signals; by adjusting the first sound pickup device 1 and the second sound pickup device 1
- the distance between the devices 2 can be aimed at different listening distances.
- the sound signal in the near center direction of the two sound pickup devices may mask the sound signal in the far center direction.
- far and near are relative concepts, which are related to the detected sound source and the first sound pickup device 1 and the second sound pickup device 2 The distance between them, and is related to the distance between the detected sound source and the second sound pickup device 2.
- Two sound pickup devices 2 are set at intervals, so the sound information obtained by the two sound pickup devices is different; the preset distance range can control the applicable distance range of the long-distance sound amplification method; according to different sound information acquisition needs, adjust the first The angle between the sound pickup forward direction of a sound pickup device 1 and the sound pickup forward direction of the second sound pickup device 2; wherein, the sound pickup forward direction of the first sound pickup device 1 and the second sound pickup device 2 The distance is within the preset distance range, and the preset distance range is the preset range value, such as 0.3m-1m, the sound pickup direction of the first sound pickup device 1 and the sound pickup direction of the second sound pickup device 2 are opposite.
- the included angle between them is within the preset included angle range, and the preset included angle range is a preset range value, such as ⁇ 30 degrees; the first sound pickup device and the second sound pickup device face the target position of the sound to be collected side by side. set up. Since the separation distance between the first sound pickup device and the second sound pickup device is small, when the first sound pickup device and the second sound pickup device are far away from the target location point, the first sound pickup device and the second sound pickup device are far away from the target location. The position difference of the devices can be ignored, so that in the first sound pickup device 1 and the second sound pickup device 2, the distance between the position of the sound collection device (such as a microphone) inside the two and the target position of the sound to be collected is almost the same.
- the preset included angle range is a preset range value, such as ⁇ 30 degrees; the first sound pickup device and the second sound pickup device face the target position of the sound to be collected side by side. set up. Since the separation distance between the first sound pickup device and the second sound pickup device is small,
- the sound acquisition surfaces of the first sound pickup device 1 and the second sound pickup device 2 are on the same plane, and the target position of the sound to be collected reaches the sound acquisition surface of the first sound pickup device 1 and the second sound pickup device 2.
- the distances are almost the same, and the first sound pickup device 1 and the second sound pickup device 2 do not produce front and rear dislocation; of course, when the target position point of the sound to be collected is far enough from the sound acquisition surface The slight error between the positions of the sound pickup device 2 can be ignored;
- the sound pickup direction of the first sound pickup device 1 refers to the orientation of the microphone used for collecting external sound signals on the first sound pickup device 1, and the second sound pickup device 2
- the sound pickup direction refers to the orientation of the microphone on the second sound pickup device 2 for collecting external sound signals.
- the amplifying device 5 is a band-pass amplifier, and the function of the band-pass amplifier is to filter and amplify the small sound signal far in front by a certain multiple (for example, several hundred times), and reserve 200HZ ⁇ 2KHZ It also filters out low-frequency wind noise, vibration noise and higher-frequency non-voice signals that are prone to whistling.
- the intensities and The phases can be considered to be approximately equal, so only the sound signal in the near non-center direction is output through the first differential amplifier 3 .
- the first differentially amplified sound signal is gain-amplified by the adjustable gain amplifier 4.
- the peak value of the first differentially amplified sound signal after gain amplification is the same as the peak value of the first sound amplified signal. Close to the same, almost the same peak value is conducive to mutual cancellation of sound signals.
- the gain-amplified first differentially amplified sound signal and the first sound amplified signal are differentially amplified by the second differential amplifier 6 to obtain a second differentially amplified sound signal.
- the sound signal in the near non-central direction is completely or partially canceled, and the sound signal in the far distance and the sound signal in the middle direction of the first sound pickup device 1 and the second sound pickup device 2 are retained. If there is no sound signal in the immediate front, it may be possible Make the signal far in front of you larger than the signal near you to achieve high-direction and long-distance monitoring.
- the sound processor 8 is a volume control and power amplifier. After the second differentially amplified sound signal is controlled and power amplified by the sound processor 8, the frequency of the output sound signal can be heard by the human ear. Within the sound frequency range, the output sound signal can be used for monitoring or recording.
- the long-distance sound amplification system also includes:
- the peak comparator 7 is connected to the adjustable gain amplifier 4 and the amplifying device 5, and is used to amplify the first differential amplified sound signal obtained after the adjustable gain amplification processing at the last time and the first sound obtained at the last time.
- the peak value of the signal is compared to obtain the feedback voltage, and the feedback signal is generated according to the feedback voltage.
- the feedback signal is used to control the amplification gain of the adjustable gain amplifier 4.
- the amplification gain is positively related to the amplitude of the feedback voltage, and the feedback signal is sent to the adjustable gain amplifier.
- the gain-adjusting amplifier 4 forms a closed loop.
- the long-distance sound amplification system also includes:
- the manual gain control circuit 9, connected with the adjustable gain amplifier 4, is used to convert the manual control action into a gain control signal, the gain control signal is used to control the amplification effect of the adjustable gain amplifier 4, and the gain control signal is sent to the Adjustable Gain Amplifier 4.
- the gain of the adjustable gain amplifier 4 is controlled by the feedback signal, so that the second differential amplifier 6 can effectively cancel the sound signal in the vicinity as much as possible.
- the amplifying device 5 is a bandpass amplifier.
- the function of the band-pass amplifier is to filter and amplify the small sound signal far in front by a certain multiple (for example, several hundred times), retain the sound signal of 200HZ ⁇ 2KHZ, and remove the low-frequency wind sound, vibration noise and higher-frequency sound that is prone to whistling. Non-voice signals are filtered out.
- the adjustable gain amplifier 4 and the peak comparator 7 constitute an automatic gain amplifier.
- the gain can be automatically controlled according to the feedback signal and/or the gain control signal, which is convenient to use.
- the total phase delay after the first differential amplifier and the adjustable gain amplifier is basically the same as the total phase delay of the amplifying device, so that the second differential amplifier 6 can effectively cancel the sound signal in the vicinity as much as possible.
- the first sound pickup device 1 and the second sound pickup device 2 are directional pickups.
- the directional pickup has a good recognition effect on distant sound signals, which can improve the monitoring effect.
- the distance between the first sound pickup device 1 and the second sound pickup device 2 is between 0.3m-1.0m.
- the long-distance sound amplifying system is dedicated to long-distance sound amplification, so as to avoid the wrong adjustment of the distance between the first sound pickup device 1 and the second sound pickup device 2 exceeding It can also effectively determine the applicable range of the long-distance sound amplification system by limiting the position at the limit positions of 0.3m and 1m.
- the first sound pickup device 1 is fixed on the frame, the direction of the target position of the second sound pickup device 2 to be collected sound can be adjusted, and the sound pickup of the first sound pickup device 1 is forward
- the angle between the second sound pickup device 2 and the sound pickup direction of the second sound pickup device 2 is between ⁇ 30 degrees.
- the direction of the target position point of the first sound pickup device 1 to be collected is the sound pickup direction of the first sound pickup device 1
- the direction of the second sound pickup device 2 is the second sound pickup device 2
- the sound pickup direction of the second sound pickup device 2 and the sound pickup forward direction of the first sound pickup device 1 are adjusted between ⁇ 30 degrees.
- the adjustment angle is ⁇ 30 degrees, part of the sound signal in the immediate front can be offset by adjusting the angle to ensure that the long-distance sound amplification system is available, and the use scene of the distance sound amplification device can be expanded as much as possible; the first sound
- the distance between the pickup device 1 and the second sound pickup device 2 can be achieved by adjusting the frame to which it is connected.
- the long-distance sound amplifying method, storage medium and smart device of the present application obtains the first sound information and the second sound information in the same direction through the first sound pickup device 1 and the second sound pickup device 2 respectively, and through the first sound pickup device 1 and the second sound pickup device 2
- a differential amplifier 3 differentially amplifies the first sound information and the second sound information, to the greatest extent possible to eliminate the sound signal in the long distance in front and the sound signal just in the middle position in front of the two pickups, and keep the sound near the non-center direction
- the signal is the first differentially amplified sound signal
- the first differentially amplified sound signal is gain-amplified by the adjustable gain amplifier 4
- the first differentially amplified sound signal after the adjustable gain is amplified by the second differential amplifier 6 and the first sound amplified signal.
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Abstract
本申请揭示了一种远距离声音放大方法、存储介质及智能设备；方法包括：将第一声音信息过滤放大处理得到第一声音放大信号，以及，将第一声音信息和第二声音信息进行差分放大处理，得到第一差分放大声音信号；将第一差分放大声音信号与第一声音放大信号差分放大处理。监听远处正对的声音，不受到近处声音的覆盖。
Description
本申请要求于2020年7月31日提交中国专利局、申请号为2020107601527，发明名称为“远距离声音放大方法、装置、系统、存储介质及智能设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
本申请涉及到信号处理技术领域，特别是涉及到一种远距离声音放大方法、存储介质及智能设备。
在安全生产、反恐、侦察领域的某些应用场景下，需要监听远处特定区域（例如一百米开外）的声音，但又容易被近场的大的声音所覆盖（声音的掩蔽效应）。另外，因声音监听设备的增益较高，某些频率的信号产生正反馈时，易产生自激啸叫。因此，现有技术中，在对远端声音信号的监听时，存在监听难度较大的问题。
本申请的主要目的为提供一种远距离声音放大方法、存储介质及智能设备，可以解决在对远端声音信号进行监听时所存在的监听难度较大的问题。
本申请提出一种远距离声音放大方法，包括如下步骤：
持续通过第一声音拾取设备获取第一声音信息以及通过第二声音拾取设备获取第二声音信息，第一声音拾取设备和第二声音拾取设备获取声音的能力相同，第一声音拾取设备和第二声音拾取设备并排设置，第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，第一声音拾取设备的拾音正向和第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；
将第一声音信息过滤并放大处理，得到第一声音放大信号，以及，将第一声音信息和第二声音信息进行差分放大处理，得到第一差分放大声音信号；
将第一差分放大声音信号进行可调增益放大处理；
将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；
将第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
进一步地，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：
将上一时间经可调增益放大处理后所得到的第一差分放大声音信号和上一时间所得到的第一声音放大信号的峰值进行比较得到反馈电压；
根据反馈电压生成反馈信号，反馈信号用于控制可调增益放大的放大增益，放大增益与反馈电压的幅值正相关。
进一步地，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：
获取增益控制信号，增益控制信号用于控制可调增益放大的放大增益，增益控制信号由用户控制预设的手动增益控制电路生成。
进一步地，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之后和将第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号的步骤之前，包括：
将第二差分放大声音信号进行数字降噪处理。
本申请还提出一种存储介质，其为计算机可读的存储介质，其上存储有计算机程序，计算机程序被执行时实现上述的远距离声音放大方法。
本申请还提出一种智能设备，包括存储器、处理器以及存储在存储器上并可在处理器上运行的计算机程序，处理器执行计算机程序时实现上述的远距离声音放大方法。
本申请还提出一种远距离声音放大系统，包括：
第一声音拾取设备，用于获取第一声音信息；
第二声音拾取设备，用于获取第二声音信息，第一声音拾取设备和第二声音拾取设备获取声音的能力相同，第一声音拾取设备和第二声音拾取设备之间的间隔距离在预设范围内，第一声音拾取设备和第二声音拾取设备面向待采集声音的目标位置点并排设置，第一声音拾取设备和第二声音拾取设备的间距以及第一声音拾取设备的拾音正向和第二声音拾取设备的拾音正向之间的夹角可调；
放大设备，与第一声音拾取设备连接，用于将第一声音信息过滤放大得到第一声音放大信号；
第一差分放大器，与第一声音拾取设备和第二声音拾取设备连接，用于将第一声音信息和第二声音信息进行差分放大处理，得到第一差分放大声音信号；
可调增益放大器，与第一差分放大器连接，用于将第一差分放大声音信号进行可调增益放大处理；
第二差分放大器，与放大设备和可调增益放大器连接，用于将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；
声音处理器，与第二差分放大器连接，用于将第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
进一步地，远距离声音放大系统还包括：
峰值比较器，连接可调增益放大器和放大设备，用于将上一时间经可调增益放大处理后所得到的第一差分放大声音信号和上一时间所得到的第一声音放大信号的峰值进行比较得到反馈电压，以及，根据反馈电压生成反馈信号，且，将反馈信号发送至可调增益放大器，反馈信号用于可调控制可调增益放大器的放大增益，放大增益与反馈电压幅值正相关。
进一步地，远距离声音放大系统还包括：
手动增益控制电路，与可调增益放大器连接，用于将手动的控制动作转换成增益控制信号，并且，将增益控制信号发送至可调增益放大器，增益控制信号用于控制可调增益放大器的放大增益。
进一步地，放大设备为带通放大器。
进一步地，第一声音拾取设备和第二声音拾取设备为指向性拾音器。
进一步地，第一声音拾取设备和第二声音拾取设备间距在0.3m-1.0m之间。
进一步地，第一声音拾取设备固定在框架上，第二声音拾取设备的拾音正向角度可调，第一声音拾取设备的拾音正向和第二声音拾取设备的拾音正向之间的夹角为±30度之间。
本申请远距离声音放大方法、存储介质及智能设备，远距离声音放大方法实现高指向和远距离的监听，保证了在监听远处正对的声音时，不会受到近处声音的覆盖，从而解决了在对远端声音信号进行监听时所存在的监听难度较大的问题。
图1 本申请远距离声音放大方法一实施例中步骤流程示意图；
图2 本申请远距离声音放大装置一实施例的结构示意图；
图3 是本申请存储介质一实施例的结构示意图；
图4 是本申请智能设备一实施例的结构示意图；
图5 本申请远距离声音放大系统一实施例结构及信号传递示意图。
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
本申请的最佳实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本技术领域技术人员可以理解，除非特意声明，这里使用的单数形式“一”、“一个”、“上述”和“该”也可包括复数形式。应该进一步理解的是，本申请的说明书中使用的措辞“包括”是指存在特征、整数、步骤、操作、元件、单元、模块和/或组件，但是并不排除存在或添加一个或多个其他特征、整数、步骤、操作、元件、单元、模块、组件和/或它们的组。应该理解，当我们称元件被“连接”或“耦接”到另一元件时，它可以直接连接或耦接到其他元件，或者也可以存在中间元件。此外，这里使用的“连接”或“耦接”可以包括无线连接或无线耦接。这里使用的措辞“和/或”包括一个或更多个相关联的列出项的全部或任一单元和全部组合。
本技术领域技术人员可以理解，除非另外定义，这里使用的所有术语（包括技术术语和科学术语），具有与本申请所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语，应该被理解为具有与现有技术的上下文中的意义一致的意义，并且除非像这里一样被特定定义，否则不会用理想化或过于正式的含义来解释。
参照图1-5，本申请远距离声音放大方法一实施例，包括如下步骤：
S1、持续通过第一声音拾取设备1获取第一声音信息以及通过第二声音拾取设备2获取第二声音信息，第一声音拾取设备1和第二声音拾取设备2获取声音的能力相同，第一声音拾取设备和第二声音拾取设备并排设置，第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，第一声音拾取设备的拾音正向和第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；
S2、将第一声音信息过滤并放大处理，得到第一声音放大信号以及，将第一声音信息和第二声音信息进行差分放大处理，得到第一差分放大声音信号；
S3、将第一差分放大声音信号进行可调增益放大处理；
S4、将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；
S5、将第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
在上述步骤S1中，以第一声音拾取设备1和第二声音拾取设备2的拾音正向为基准，第一声音信息和第二声音信息均分别包括近处非正中方向的声音信号、近处正中方向的声音信号以及远处的声音信号；第一声音拾取设备1和第二声音拾取设备2为指向性拾音器，第一声音拾取设备1和第二声音拾取设备2获取声音的能力相同，目的是保证第一声音拾取设备1和第二声音拾取设备2在位置相同/相近的情况下，能够获取到相同/相似的声音信息，并使得后续通过实现相同/相似声音信号的相互抵消，方便获取用户所需的目标声音信号；相似的声音信息是指第一声音拾取设备1和第二声音拾取设备2获取的声音信息的内容、强度以及频率均接近相同；第一声音拾取设备1和第二声音拾取设备2优选的为相同的设备，以保证第一声音拾取设备1和第二声音拾取设备2获取声音的能力相同；通过调整第一声音拾取设备1和第二声音拾取设备2的间距可以针对不同的监听距离进行监听，当第一声音拾取设备1和第二声音拾取设备2的间距越大，监听的距离越远；当第一声音拾取设备1和第二声音拾取设备2平行设置时，在后续步骤中，两个声音拾取设备的近处正中方向的声音信号有可能掩盖远处正中方向的声音信号，通过调整两个声音拾取设备的拾音方向之间所成的夹角，可以部分抵消掉近处正中方向的声音信号；应当说的是，远处和近处都是相对的概念，其与被检测声音源头与第一声音拾取设备1间的距离，以及，与被检测声音源头与第二声音拾取设备2间的距离有关，当距离越远则远处和近处的所指范围就越大，因第一声音拾取设备1和第二声音拾取设备2间隔设置，因此两个声音拾取设备获取的声音信息有所差异；通过预设第一声音拾取设备1和第二声音拾取设备2的间隔距离范围，可以控制远距离声音放大方法可应用的距离范围；针对不同的声音信息获取需求，调整第一声音拾取设备1的拾音正向和第二声音拾取设备2的拾音正向之间的夹角；其中，预设的间隔距离范围为预设的范围值，例如0.3m-1m，预设夹角范围为预设的范围值，例如±30度；第一声音拾取设备和第二声音拾取设备面向待采集声音的目标位置点并排设置。由于第一声音拾取设备和第二声音拾取设备的间隔距离较小，当第一声音拾取设备和第二声音拾取设备与目标位置点的距离较远时，第一声音拾取设备和第二声音拾取设备的位置差异可以忽略，使第一声音拾取设备1和第二声音拾取设备2中，二者内部的声音采集器件（如麦克风）所处位置点至待采集声音的目标位置点的距离几近相等。优选的，第一声音拾取设备1和第二声音拾取设备2声音获取面在同一平面上，待采集声音的目标位置点到达第一声音拾取设备1和第二声音拾取设备2声音获取面的距离几近相同，第一声音拾取设备1和第二声音拾取设备2不产生前后错位；当然，在待采集声音的目标位置点距离声音获取面足够远时，第一声音拾取设备1和第二声音拾取设备2位置间的轻微误差可以忽略不计；第一声音拾取设备1的拾音正向是指第一声音拾取设备1上用于采集外部声音信号的麦克风的朝向，第二声音拾取设备2的拾音正向是指第二声音拾取设备2上用于采集外部声音信号的麦克风的朝向。
在上述步骤S2中，在本实施例中，放大设备5为带通放大器，带通放大器的作用是将前方远处音量较小的声音信号进行滤波并放大一定倍数（例如几百倍），保留200HZ~2KHZ的声音信号，且将低频的风声、振动噪音和易产生啸叫的较高频的非语音信号滤掉；第一差分放大声音信号中保留近处非正中方向的声音信号；第一声音拾取设备1上用于采集外部声音信号的麦克风指向正前方，第二声音拾取设备2上用于采集外部声音信号的麦克风指向角度为正前方的±30度，具体角度范围可调。当两个声音拾取设备平行指向正前方时，对于前方远距离的声音信号以及刚好在两个声音拾取设备前方正中位置的声音信号，其分别到达两声音拾取设备时的强度和相位可以认为近似相等，因此经第一差分放大器3输出的只有近处非正中方向的声音信号；在另一些实施例中，通过软件实现上述步骤S2，第一声音放大信号为数字信号，第一声音信息和所述第二声音信息进行数字模拟处理，转化成数字信号，再进行差分放大处理，则得到的第一差分放大声音信号为数字信号。
在上述步骤S3中，在一些实施例中，通过可调增益放大器4将第一差分放大声音信号增益放大，优选的，使增益放大后的第一差分放大声音信号的峰值与第一声音放大信号的峰值接近相同，几近相同的峰值有利于声音信号的相互抵消；在另一些实施例中，通过软件实现上述步骤S3，第一差分放大声音信号为数字信号。
在上述步骤S4中，在一些实施例中，通过第二差分放大器6将增益放大后的第一差分放大声音信号与第一声音放大信号差分放大处理，得到第二差分放大声音信号。第二差分放大声音信号中，近处非正中方向的声音信号全部或部分抵消且远处的声音信号和第一声音拾取设备1和第二声音拾取设备2正中方向的声音信号被保留，如果正前方近处没有声音信号就可能使得正前方远处的信号大于近处的信号从而实现高指向和远距离的监听；在另一些实施例中，通过软件实现上述步骤S4，第一差分放大声音信号和第一声音放大信号为数字信号。
在上述步骤S5中，在一些实施例中，通过声音处理器8对第二差分放大声音信号进行音量控制与功率放大后，输出的声音信号的频率在人耳能够听到的声音频率范围内，故输出的声音信号可以供监听或录音；在另一些实施例中，通过软件实现上述步骤S5，其中第二差分放大声音信号为数字信号。
远距离声音放大方法通过第一声音拾取设备1以及第二声音拾取设备2分别获取同向的第一声音信息和第二声音信息，通过第一差分放大器3将第一声音信息和第二声音信息差分放大，尽最大限度的排除掉前方远距离的声音信号以及刚好在两拾音器前方正中位置的声音信号，保留近处非正中方向的声音信号即第一差分放大声音信号，通过可调增益放大器4将第一差分放大声音信号增益放大，通过第二差分放大器6将可调增益放大后的第一差分放大声音信号与第一声音放大信号差分放大（注：第一声音放大信号与可调增益放大后的第一差分放大信号的总相位延时要基本相同），得到近处非正中方向的声音信号被抵消掉一大部分，且远处的声音信号和所指向的两声音拾取设备正中方向的声音信号被保留，经过声音处理器8将第二差分放大声音信号进行音量控制与功率放大得到输出声音信号，保证了在监听远处正对的声音时，不会受到近处声音的覆盖，从而解决了在对远端声音信号进行监听时所存在的监听难度较大的问题。
进一步地，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤S4之前，包括：
S401、将上一时间经可调增益放大处理后所得到的第一差分放大声音信号和上一时间所得到的第一声音放大信号的峰值进行比较，得到反馈电压；
S402、根据反馈电压生成反馈信号，反馈信号用于控制可调增益放大的放大增益，放大增益与反馈电压的幅值正相关。
在上述步骤S401- S402中，在一些实施例中，步骤S401-
S402均通过峰值比较器7实现，反馈信号发送至可调增益放大器4，通过反馈信号去控制可调增益放大器4的增益，反馈电压幅值越大，增益越大，可以使第二差分放大器6尽量将近处的声音信号抵消；在另一些实施例中，通过软件实现上述步骤S401- S402，其中上一时间的第一差分放大声音信号、上一时间的第一声音放大信号，二者相比较得到的差值和反馈信号都为数字信号；其中，上一时间是指第一差分放大声音信号到达第二差分放大器6与因可调增益放大器4第一差分放大声音信号获取到反馈信号所产生的相位延时。
进一步地，在一些实施例中，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤S4之前，包括：
S403、获取增益控制信号，增益控制信号用于控制可调增益放大的放大增益，增益控制信号由用户控制预设的手动增益控制电路生成。
在上述步骤S403中，在一些实施例中，步骤S403通过手动增益控制电路9实现，将增益控制信号发送至可调增益放大器4，可以实现通过手动调节增益，使用户可以手动调节近处声音的抵消效果，例如在手动旋转按钮时，手动增益控制电路9将生成增益控制信号，进而控制可调增益放大器4的放大增益，因此在步骤S4中的近处的声音信号抵消效果也受到影响，也就是相当于可以调节监听近处的声音还是远处的声音；在另一些实施例中，通过软件实现上述步骤S403，其中增益控制信号为数字信号。
进一步地，将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤S4之后和将第二差分放大声音信号进行音量控制与功率放大处理，得到输出声音信号的步骤S5之前，包括：
S501、将第二差分放大声音信号进行数字降噪处理。
在上述步骤S501中，应用于步骤S1- S4通过硬件处理的情况，通过信号处理器将第二差分放大声音信号进行数字降噪处理，数字降噪处理即进行模数转换后再进行声音的数字降噪处理，可以消除掉一些噪音，在进行监听时效果更好。
以下为远距离声音放大方法举例说明：
假设人正常讲话时在距声源1米处测得的声压级平均为66dB (注：一般平均值为65~69dB)，如果不考虑大气吸收衰减、地面效应衰减、树叶等障碍物的衰减等因素，则距人101米远处的声压衰减为40dB，即测得的平均声压为26 dB（实际会更小），如果相距100米远处的另一人所处的环境噪音或其他声音超过26 dB，那么人耳是听不清100米外的人正常讲话声的。具体到放大电路，如果声音拾取设备的灵敏度为-40 dBV/Pa (1Pa=94 dBSPL)，则26 dBSPL声压，经声音拾取设备转换成电信号输出约为4uV，前级放大200倍也才0.8mV，但声音拾取设备附近的正常讲话的声音信号经转换后大几十倍, 放大200倍后将变为几mV~80mV。经放大设备5放大后，近处和远处的声音信号都保留，但第一差分放大器3输出只有近处非正中方向的声音信号，用可调增益放大器4的目的是近处非正中方向的第一差分放大声音信号增益放大到接近放大设备5的输出，从而在第二差分放大器6中大部份抵消，而保留远处的声音信号以及保留第一声音拾取设备1和第二声音拾取设备2正中方向的声音信号，实现高指向远距离监听。因此可调增益放大器4的最大增益需高于放大设备5的固定增益（推荐200~300倍）。设置手动增益控制电路9的目的是用户可以手动调节近处声音信号的抵消效果，也就是相当于可以调节监听近处的声音还是远处的声音。
当然，近处正前方的声音信号也会掩盖远处的声音信号，如不想让它掩盖远处的声音信号，可以微调第二声音拾取设备2的角度，使第一差分放大器3对第一声音拾取设备1和第二声音拾取设备2正中方向的声音信号输出不为0，这样也可以抵消掉大部分近处正前方的声音信号。
另外，第二差分放大器6的输出也可以进行模数转换后再进行声音的数字降噪处理，消除掉一些噪音后再进行监听效果更好。
另外，第一声音拾取设备1和第二声音拾取设备2也可以采用不同的声音拾取设备，结构不做具体限定，但要求设备的工作参数尽量一致，以保证第一声音拾取设备1和第二声音拾取设备2获取声音信号的能力相同。
第一声音拾取设备1和第二声音拾取设备2的间距与所要监听的目标距离有关。目标距离越远，则第一声音拾取设备1和第二声音拾取设备2的间距越远，反之则间距越近，极限情况下第一声音拾取设备1和第二声音拾取设备2可重叠，即只设有一个第一声音拾取设备1或第二声音拾取设备2，第一差分放大器3输出信号幅值近似为0，近处的声音信号在第二差分放大器6输出没有抵消作用，如果近处有声音信号则无法听到远处的声音信号。
参照图2，本申请还提出一种远距离声音放大装置，包括：
声音获取模块01，用于持续通过第一声音拾取设备获取第一声音信息以及通过第二声音拾取设备获取第二声音信息，第一声音拾取设备和第二声音拾取设备获取声音的能力相同，第一声音拾取设备和第二声音拾取设备并排设置，第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，第一声音拾取设备的拾音正向和第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；
第一差分处理模块02，用于将第一声音信息过滤并放大处理，得到第一声音放大信号，以及，将第一声音信息和第二声音信息进行差分放大处理，得到第一差分放大声音信号；
可调增益模块03，用于将第一差分放大声音信号进行可调增益放大处理；
第二差分处理模块04，用于将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；
放大模块05，用于将第二差分放大声音信号进行音量控制与功率放大得到输出声音信号。
进一步地，远距离声音放大装置还包括：
反馈电压获取模块，用于将上一时间经可调增益放大处理后所得到的第一差分放大声音信号和上一时间所得到的第一声音放大信号的峰值进行比较，得到反馈电压；
反馈模块，用于根据反馈电压生成反馈信号，反馈信号用于控制可调增益放大的放大增益，放大增益与反馈电压幅值正相关。
进一步地，远距离声音放大装置还包括：
手动控制信号生成模块，用于获取增益控制信号，增益控制信号用于控制可调增益放大的放大增益，增益控制信号由用户控制预设的手动增益控制电路生成。
进一步地，远距离声音放大装置还包括：
数据转化模块，用于将第二差分放大声音信号进行数字降噪处理。
参照图3，本申请实施例还提出一种存储介质100，其为计算机可读的存储介质，其上存储有计算机程序200，计算机程序200被执行时实现上述任一实施例中的远距离声音放大方法。
参照图4，本申请实施例还提出一种智能设备300，包括存储器400、处理器500以及存储在存储器400上并可在处理器500上运行的计算机程序200，处理器500执行计算机程序200时实现上述任一实施例中的远距离声音放大方法。
本领域技术人员可以理解，本申请实施例的智能设备300为上述所涉及用于执行本申请中方法中的一项或多项的设备。这些设备可以为所需的目的而专门设计和制造，或者也可以包括通用计算机中的已知设备。这些设备具有存储在其内的计算机程序200或应用程序，这些计算机程序200选择性地激活或重构。这样的计算机程序200可以被存储在设备（例如，计算机）可读介质中或者存储在适于存储电子指令并分别耦联到总线的任何类型的介质中，计算机可读介质包括但不限于任何类型的盘（包括软盘、硬盘、光盘、CD-ROM、和磁光盘）、ROM（Read-Only
Memory，只读存储器）、RAM（Random Access
Memory，随机存储器）、EPROM（Erasable
Programmable Read-Only Memory，可擦写可编程只读存储器）、EEPROM（Electrically Erasable Programmable Read-Only Memory，电可擦可编程只读存储器）、闪存、磁性卡片或光线卡片。也就是，可读介质包括由设备（例如，计算机）以能够读的形式存储或传输信息的任何介质。
参照图5，本申请还提出一种远距离声音放大系统，包括：
第一声音拾取设备1，用于获取第一声音信息；
第二声音拾取设备2，用于获取第二声音信息，第一声音拾取设备1和第二声音拾取设备2获取声音信号的能力相同，第一声音拾取设备1和第二声音拾取设备2之间的间隔距离在预设范围内，第一声音拾取设备1和第二声音拾取设备2面向待采集声音的目标位置点并排设置，第一声音拾取设备1和第二声音拾取设备2的间距以及第一声音拾取设备1的拾音正向和第二声音拾取设备2的拾音正向之间的夹角可调；
放大设备5，与第一声音拾取设备1连接，用于将第一声音信息过滤放大得到第一声音放大信号；
第一差分放大器3，与第一声音拾取设备1和第二声音拾取设备2连接，用于将第一声音信息和第二声音信息进行差分放大，得到第一差分放大声音信号，第一差分放大声音信号中保留近处非正中方向的声音信号；
可调增益放大器4，与第一差分放大器3连接，用于将第一差分放大声音信号进行可调增益放大处理。以使增益放大后的第一差分放大声音信号的峰值与第一声音放大信号的峰值接近相同；
第二差分放大器6，与放大设备5和可调增益放大器4连接，用于将可调增益放大后的第一差分放大声音信号与第一声音放大信号进行差分放大处理，得到第二差分放大声音信号，第二差分放大声音信号中近处非正中方向的声音信号全部或部分抵消且远处的声音信号和第一声音拾取设备1和第二声音拾取设备2正中方向的声音信号被保留；
声音处理器8，与第二差分放大器6连接，用于将第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
在上述第一声音拾取设备1和第二声音拾取设备2中，第一声音拾取设备1和第二声音拾取设备2为指向性拾音器，第一声音拾取设备1和第二声音拾取设备2获取声音信号的能力相同，目的是保证第一声音拾取设备和第二声音拾取设备在位置相同/相近的情况下，能够获取到相同/相似的声音信息，并使得后续通过实现相同/相似声音信号的相互抵消，方便获取用户所需的目标声音信号；相似的声音信息是指第一声音拾取设备1和第二声音拾取设备2获取的声音信息的内容、强度以及频率均接近相同；第一声音拾取设备1和第二声音拾取设备2优选的为相同的设备，以保证第一声音拾取设备1和第二声音拾取设备2获取声音信号的能力相同；通过调整第一声音拾取设备1和第二声音拾取设备2的间距可以针对不同的监听距离，当第一声音拾取设备1和第二声音拾取设备2的间距越大，监听的距离越远；当第一声音拾取设备1和第二声音拾取设备2平行设置时，在后续步骤中，两个声音拾取设备的近处正中方向的声音信号有可能掩盖远处正中方向的声音信号，通过调整两个声音拾取设备的拾音方向之间所成的夹角，可以部分抵消掉近处正中方向的声音信号；应当说的是，远处和近处都是相对的概念，其与被检测声音源头与第一声音拾取设备1和第二声音拾取设备2间的距离，以及，与被检测声音源头与第二声音拾取设备2间的距离有关，当距离越远则远处和近处的所指范围就越大，因第一声音拾取设备1和第二声音拾取设备2间隔设置，因此两个声音拾取设备获取的声音信息有所差异；通过预设距离范围可以控制远距离声音放大方法可应用的距离范围；针对不同的声音信息获取需求，调整第一声音拾取设备1的拾音正向和第二声音拾取设备2的拾音正向之间的夹角；其中，第一声音拾取设备1的拾音正向和第二声音拾取设备2之间的距离在预设距离范围内，预设距离范围为预设的范围值，例如0.3m-1m，第一声音拾取设备1的拾音正向和第二声音拾取设备2的拾音正向之间的夹角在预设夹角范围之内，预设夹角范围为预设的范围值，例如±30度；第一声音拾取设备和第二声音拾取设备面向待采集声音的目标位置点并排设置。由于第一声音拾取设备和第二声音拾取设备的间隔距离较小，当第一声音拾取设备和第二声音拾取设备与目标位置点的距离较远时，第一声音拾取设备和第二声音拾取设备的位置差异可以忽略，使第一声音拾取设备1和第二声音拾取设备2中，二者内部的声音采集器件（如麦克风）所处位置点至待采集声音的目标位置点的距离几近相等，优选的，第一声音拾取设备1和第二声音拾取设备2声音获取面相在同一平面上，待采集声音的目标位置点到达第一声音拾取设备1和第二声音拾取设备2声音获取面的距离几近相同，第一声音拾取设备1和第二声音拾取设备2不产生前后错位；当然在待采集声音的目标位置点距离声音获取面足够远时，第一声音拾取设备1和第二声音拾取设备2位置间的轻微误差可以忽略不计；第一声音拾取设备1的拾音正向是指第一声音拾取设备1上用于采集外部声音信号的麦克风的朝向，第二声音拾取设备2的拾音正向是指第二声音拾取设备2上用于采集外部声音信号的麦克风的朝向。
在上述放大设备5中，在本实施例中，放大设备5为带通放大器，带通放大器的作用是将前方远处小的声音信号滤波放大一定倍数（例如几百倍），保留200HZ~2KHZ的声音信号，且将低频的风声、振动噪音和易产生啸叫的较高频的非语音信号滤掉。
在上述第一差分放大器3中，当两个声音拾取设备平行指向正前方时，对于前方远距离的声音信号以及刚好在两个声音拾取设备前方正中位置的声音信号到达两拾音器时的强度和相位可以认为近似相等，因此经第一差分放大器3输出的只有近处非正中方向的声音信号。
在上述可调增益放大器4中，通过可调增益放大器4将第一差分放大声音信号增益放大，优选的，以使增益放大后的第一差分放大声音信号的峰值与第一声音放大信号的峰值接近相同，几近相同的峰值有利于声音信号的相互抵消。
在上述第二差分放大器6中，通过第二差分放大器6将增益放大后的第一差分放大声音信号与第一声音放大信号差分放大，得到第二差分放大声音信号，第二差分放大声音信号中近处非正中方向的声音信号全部或部分抵消且远处的声音信号和第一声音拾取设备1和第二声音拾取设备2正中方向的声音信号被保留，如果正前方近处没有声音信号就可能使得正前方远处的信号大于近处的信号从而实现高指向和远距离的监听。
在上述声音处理器8中，声音处理器8为音量控制与功率放大器，通过声音处理器8对第二差分放大声音信号进行控制与功率放大后，输出的声音信号的频率在人耳能够听到的声音频率范围内，输出的声音信号可以供监听或录音。
进一步地，远距离声音放大系统还包括：
峰值比较器7，连接可调增益放大器4和放大设备5，用于将上一时间的经可调增益放大处理后所得到的第一差分放大声音信号和上一时间所得到的第一声音放大信号的峰值进行比较得到反馈电压，以及，根据反馈电压生成反馈信号，反馈信号用于控制可调增益放大器4的放大增益，放大增益与反馈电压幅值正相关，且，将反馈信号发送至可调增益放大器4形成闭环。
进一步地，远距离声音放大系统还包括：
手动增益控制电路9，与可调增益放大器4连接，用于将手动的控制动作转换成增益控制信号，增益控制信号用于控制可调增益放大器4的放大效果，并且，将增益控制信号发送至可调增益放大器4。通过反馈信号去控制可调增益放大器4的增益，可以使第二差分放大器6有效使近处的声音信号尽量抵消。
进一步地，放大设备5为带通放大器。带通放大器的作用是将前方远处小的声音信号滤波放大一定倍数（例如几百倍），保留200HZ~2KHZ的声音信号，将低频的风声、振动噪音和易产生啸叫的较高频的非语音信号滤掉。
进一步地，可调增益放大器4和峰值比较器7构成自动增益放大器。可以根据反馈信号和/或增益控制信号自动控制增益，使用方便。第一差分放大器及可调可调增益放大器后的总相位延时与放大设备的总相位延时基本相同，可以使第二差分放大器6有效使近处的声音信号尽量抵消。
进一步地，第一声音拾取设备1和第二声音拾取设备2为指向性拾音器。指向性拾音器对远处的声音信号识别效果好，可以提高监听效果。
进一步地，在一些实施例中，第一声音拾取设备1和第二声音拾取设备2间距在0.3m-1.0m之间。通过第一声音拾取设备1和第二声音拾取设备2间距限制，使远距离声音放大系统专用于远距离的声音放大，避免第一声音拾取设备1和第二声音拾取设备2间间距误调整超出范围，还可以通过在0.3m和1m所在的极限位置时限位，有效确定远距离声音放大系统的适用范围。
进一步地，在一些实施例中，第一声音拾取设备1固定在框架上，第二声音拾取设备2的对待采集声音的目标位置点的指向可调，第一声音拾取设备1的拾音正向和第二声音拾取设备2的拾音正向之间的夹角为±30度之间。
在本实施例中，以第一声音拾取设备1对待采集声音的目标位置点的指向为第一声音拾取设备1的拾音正向，第二声音拾取设备2的指向为第二声音拾取设备2的拾音正向，第二声音拾取设备2的拾音正向与第一声音拾取设备1的拾音正向之间的调整角度为±30度之间。在调整角度为±30度之间可以通过在调整角度实现抵消掉部分近处正前方的声音信号，保证远距离声音放大系统可用的情况下，尽量扩大距离声音放大装置的使用场景；第一声音拾取设备1和第二声音拾取设备2之间的距离可以通过调整与其连接的框架来实现。
本申请远距离声音放大方法、存储介质及智能设备，远距离声音放大方法通过第一声音拾取设备1以及第二声音拾取设备2分别获取同向的第一声音信息和第二声音信息，通过第一差分放大器3将第一声音信息和第二声音信息差分放大，尽最大限度的排除掉前方远距离的声音信号以及刚好在两拾音器前方正中位置的声音信号，保留近处非正中方向的声音信号即第一差分放大声音信号，通过可调增益放大器4将第一差分放大声音信号增益放大，通过第二差分放大器6将可调增益放大后的第一差分放大声音信号与第一声音放大信号差分放大，近处非正中方向的声音信号被抵消掉一大部分，得到远处的声音信号和所指向的两声音拾取设备正中方向的信号被保留的第二差分放大声音信号，通过声音处理器8将第二差分放大声音信号进行音量控制与功率放大得到输出声音信号，实现高指向和远距离的监听，保证了在监听远处正对的声音时，不会受到近处声音的覆盖，从而解决了在对远端声音信号进行监听时所存在的监听难度较大的问题。
以上所述仅为本申请的优选实施例，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。
Claims (15)
- 一种远距离声音放大方法，其特征在于，包括如下步骤：持续通过第一声音拾取设备获取第一声音信息以及通过第二声音拾取设备获取第二声音信息，所述第一声音拾取设备和第二声音拾取设备获取声音的能力相同，所述第一声音拾取设备和第二声音拾取设备并排设置，所述第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，所述第一声音拾取设备的拾音正向和所述第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；将所述第一声音信息过滤并放大处理，得到第一声音放大信号，以及，将所述第一声音信息和所述第二声音信息进行差分放大处理，得到第一差分放大声音信号；将所述第一差分放大声音信号进行可调增益放大处理；将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
- 根据权利要求1所述的远距离声音放大方法，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：将上一时间经可调增益放大处理后所得到的所述第一差分放大声音信号和上一时间所得到的所述第一声音放大信号的峰值进行比较，得到反馈电压；根据所述反馈电压生成反馈信号，所述反馈信号用于控制所述可调增益放大的放大增益，所述放大增益与所述反馈电压的幅值正相关。
- 根据权利要求1所述的远距离声音放大方法，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：获取增益控制信号，所述增益控制信号用于控制所述可调增益放大的放大增益，所述增益控制信号由用户控制预设的手动增益控制电路生成。
- 根据权利要求1所述的远距离声音放大方法，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之后和所述将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号的步骤之前，包括：将所述第二差分放大声音信号进行数字降噪处理。
- 根据权利要求1所述的远距离声音放大方法，其特征在于，所述第一声音拾取设备和所述第二声音拾取设备均为指向性拾音器，且所述第一声音拾取设备和所述第二声音拾取设备获取声音的能力相同。
- 一种智能设备，其特征在于，包括存储器、处理器以及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如下步骤：持续通过第一声音拾取设备获取第一声音信息以及通过第二声音拾取设备获取第二声音信息，所述第一声音拾取设备和第二声音拾取设备获取声音的能力相同，所述第一声音拾取设备和第二声音拾取设备并排设置，所述第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，所述第一声音拾取设备的拾音正向和所述第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；将所述第一声音信息过滤并放大处理，得到第一声音放大信号，以及，将所述第一声音信息和所述第二声音信息进行差分放大处理，得到第一差分放大声音信号；将所述第一差分放大声音信号进行可调增益放大处理；将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
- 根据权利要求6所述的智能设备，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：将上一时间经可调增益放大处理后所得到的所述第一差分放大声音信号和上一时间所得到的所述第一声音放大信号的峰值进行比较，得到反馈电压；根据所述反馈电压生成反馈信号，所述反馈信号用于控制所述可调增益放大的放大增益，所述放大增益与所述反馈电压的幅值正相关。
- 根据权利要求6所述的智能设备，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：获取增益控制信号，所述增益控制信号用于控制所述可调增益放大的放大增益，所述增益控制信号由用户控制预设的手动增益控制电路生成。
- 根据权利要求6所述的智能设备，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之后和所述将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号的步骤之前，包括：将所述第二差分放大声音信号进行数字降噪处理。
- 根据权利要求6所述的智能设备，其特征在于，所述第一声音拾取设备和所述第二声音拾取设备均为指向性拾音器，且所述第一声音拾取设备和所述第二声音拾取设备获取声音的能力相同。
- 一种存储介质，其特征在于，其为计算机可读的存储介质，其上存储有计算机程序，所述计算机程序被执行时实现如下方法：持续通过第一声音拾取设备获取第一声音信息以及通过第二声音拾取设备获取第二声音信息，所述第一声音拾取设备和第二声音拾取设备获取声音的能力相同，所述第一声音拾取设备和第二声音拾取设备并排设置，所述第一声音拾取设备和第二声音拾取设备之间的距离在预设距离范围之内，所述第一声音拾取设备的拾音正向和所述第二声音拾取设备的拾音正向之间的夹角在预设角度范围之内；将所述第一声音信息过滤并放大处理，得到第一声音放大信号，以及，将所述第一声音信息和所述第二声音信息进行差分放大处理，得到第一差分放大声音信号；将所述第一差分放大声音信号进行可调增益放大处理；将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号；将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号。
- 根据权利要求11所述的存储介质，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：将上一时间经可调增益放大处理后所得到的所述第一差分放大声音信号和上一时间所得到的所述第一声音放大信号的峰值进行比较，得到反馈电压；根据所述反馈电压生成反馈信号，所述反馈信号用于控制所述可调增益放大的放大增益，所述放大增益与所述反馈电压的幅值正相关。
- 根据权利要求11所述的存储介质，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之前，包括：获取增益控制信号，所述增益控制信号用于控制所述可调增益放大的放大增益，所述增益控制信号由用户控制预设的手动增益控制电路生成。
- 根据权利要求11所述的存储介质，其特征在于，所述将可调增益放大后的所述第一差分放大声音信号与所述第一声音放大信号进行差分放大处理，得到第二差分放大声音信号的步骤之后和所述将所述第二差分放大声音信号进行音量控制与功率放大，得到输出声音信号的步骤之前，包括：将所述第二差分放大声音信号进行数字降噪处理。
- 根据权利要求11所述的存储介质，其特征在于，所述第一声音拾取设备和所述第二声音拾取设备均为指向性拾音器，且所述第一声音拾取设备和所述第二声音拾取设备获取声音的能力相同。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1564980A1 (en) * | 2004-02-13 | 2005-08-17 | Sony Corporation | Acoustic echo canceller |
| CN109151408A (zh) * | 2018-09-25 | 2019-01-04 | 长沙世邦通信技术有限公司 | 一种全双工窗口对讲装置、系统及其对讲方法 |
| CN109167982A (zh) * | 2018-09-25 | 2019-01-08 | 长沙世邦通信技术有限公司 | 一种全双工窗口对讲装置、系统及其对讲方法 |
| CN110958343A (zh) * | 2019-12-11 | 2020-04-03 | 上海传英信息技术有限公司 | 一种移动终端降噪方法及具有降噪功能的移动终端 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1564980A1 (en) * | 2004-02-13 | 2005-08-17 | Sony Corporation | Acoustic echo canceller |
| CN109151408A (zh) * | 2018-09-25 | 2019-01-04 | 长沙世邦通信技术有限公司 | 一种全双工窗口对讲装置、系统及其对讲方法 |
| CN109167982A (zh) * | 2018-09-25 | 2019-01-08 | 长沙世邦通信技术有限公司 | 一种全双工窗口对讲装置、系统及其对讲方法 |
| CN110958343A (zh) * | 2019-12-11 | 2020-04-03 | 上海传英信息技术有限公司 | 一种移动终端降噪方法及具有降噪功能的移动终端 |
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