CN103905958A - Audio processing device and method - Google Patents
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- CN103905958A CN103905958A CN201410161399.1A CN201410161399A CN103905958A CN 103905958 A CN103905958 A CN 103905958A CN 201410161399 A CN201410161399 A CN 201410161399A CN 103905958 A CN103905958 A CN 103905958A
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Abstract
The invention relates to the field of audio processing and discloses an audio processing device. The audio processing device is used for voice audio acquisition under the conditions of high background noise and small space. The audio processing device comprises a power supply, an audio input device, an MCU device and a communication device. The invention further discloses an audio processing method with the audio processing device adopted. The audio processing device and method have the advantages that the device and method can be used for audio acquisition in the environment in a spacious room and are particularly suitable for meeting rooms and courts, the acquired audio quality is good, the sound sharpness is high, the audio processing method an device are suitable for occasions where audio analysis is needed for voice control, and the application value is high.
Description
Technical field
The present invention relates to field of audio processing, particularly a kind of apparatus for processing audio and audio-frequency processing method.
Background technology
Audio frequency processing refers to audio process, is called again digital processing unit.Digital processing unit is exactly the processing to digital signal, and its inner structure is generally made up of importation and output.Wherein belong to the function that audio treatment part divides generally as follows: importation generally can comprise, input gain control (INPUTGAIN), input uniform (some sections of equalization parameters) regulates (INPUT EQ), defeated audio process DA206 audio process DA206 enters to hold time delay to regulate (INPUT DELAY), the functions such as input polarity (phase place that namely everybody says) conversion (input polarity).And output generally has signal input to distribute Route Selection (ROUNT), high pass filter (HPF), low pass filter (LPF), equalizer (OUTPUTEQ), polarity (polarity), gain (GAIN), time delay (DELAY), the functions such as amplitude limiter triggering level (LIMIT).
In prior art, be subject to device-restrictive, just can carry out simple audio mixing and point-to-point audio frequency input and output, give user's choice too little, function singleness, the scope of application is little.Thus, be necessary to develop a kind of more audio frequency apparatus of Multi-audio-frequency processing capacity that has.
Summary of the invention
The present invention is directed to the single shortcoming of prior art sound intermediate frequency functions of the equipments, a kind of apparatus for processing audio and audio-frequency processing method are provided, can carry out synchronous acquisition and processing by the audio frequency input and output to multidiameter delay, reach the object that improves audio frequency Disposal quality.
For achieving the above object, the present invention can take following technical proposals:
Apparatus for processing audio, for the speech audio collection in high background noise and less space, comprises power supply, voice input device, MCU device and communicator; Wherein,
Described power supply is for providing electric power to described voice input device, MCU device and communicator;
Described voice input device comprises the audio frequency input at least 2 tunnels, also comprises the digital regulation resistance that can regulate independently audio signal and the first operational amplifier that signal is amplified;
Described MCU device comprises MCU and power down storage chip, and described MCU is for the treatment of the input and output of audio signal, and described power down storage chip is used for preserving parameters, and obtains parameter preset by carrying out communication with host computer;
Described communicator comprises the serial communication interface of at least 2 kinds, is respectively used to the Control on Communication between main control computer or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.
In embodiments of the invention, also comprise audio output device, described audio output device comprises the audio frequency output at least 2 tunnels, described audio frequency output also comprises four path analoging switch chip controls devices and the second operational amplifier, thereby described four path analoging switch chip controls devices reach for increasing income by MCU control simulation the object of selecting input source; Described the second operational amplifier carries out amplification again for the audio frequency that described audio frequency is exported.
In embodiments of the invention, also comprise audio signal processor, described audio signal processor is processed for the audio signal that described voice input device is inputted, and comprises utter long and high-pitched sounds restraining device and rise cancellation element; The described restraining device of uttering long and high-pitched sounds is for suppressing to comprise uttering long and high-pitched sounds and local noise of being caused by feedback; Described echo cancellation module reenters the echo interference of described voice input device for preventing the audio signal of output.
In embodiments of the invention, described audio output device also comprises the following steps: that the audio signal of being exported by audio output device, under the control of MCU device, exports loudspeaker to or is saved to the far-end server being positioned on network.
The audio-frequency processing method of applying above-mentioned apparatus for processing audio, comprises following concrete steps:
Audio frequency input step: use digital regulation resistance respectively the audio signal being imported by audio frequency input to be regulated independently; Use the first operational amplifier to amplify the audio signal after regulating;
MCU controls step: use the input and output of MCU audio signal, a storage chip that makes to use up is preserved parameters, and obtains parameter preset by carrying out communication with host computer;
Communication steps: use respectively communicating by letter between different serial communication interface control main control computers or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.
In embodiments of the invention, also comprise audio frequency output step: thus described four path analoging switch chip controls devices are increased income and are reached the object of selecting input source by MCU control simulation; The audio frequency of described audio frequency being exported by described the second operational amplifier carries out amplification again.
In embodiments of the invention, also comprise Audio Signal Processing step: the audio signal that described voice input device is inputted is processed, comprise that the restraining device of uttering long and high-pitched sounds described in use suppresses to comprise uttering long and high-pitched sounds and local noise of being caused by feedback, and the echo that uses described echo cancellation module to prevent that the audio signal of output from reentering described voice input device is disturbed.
The present invention has following remarkable technique effect:
Utilize flush bonding processor to control, multimedia input and microphone input are controlled separately respectively, add RS485 interface, realize the cascade between audio frequency processing array; Add RS232, realize communicating by letter between master control and audio frequency processing array.Multichannel input and output, various input and output, can meet multiple occasion and requirement; Multiple Audio Matrixs directly can cascade; Can realize other equipment control by host computer
Brief description of the drawings
Fig. 1 is the structural representation of apparatus for processing audio.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
Apparatus for processing audio, as shown in Figure 1, for the speech audio collection in high background noise and less space, comprises power supply, voice input device 101, MCU device 102 and communicator 103; Wherein,
Described power supply is for providing electric power to described voice input device 101, MCU device 102 and communicator 103, mainly that power supply to coming in is changed, to meet the voltage request of system various piece, adopt DC-DC conversion chip, improve conversion efficiency, reduce caloric value, ensured the stable of system.
Described voice input device 101 comprises the audio frequency input at least 2 tunnels, also comprises the digital regulation resistance that can regulate independently audio signal and the first operational amplifier that signal is amplified.Audio frequency importation comprises independently 16 road audio frequency inputs altogether.The audio frequency input of Zhe16 road can be divided into again the balance input of Wai12 road and the non-equilibrium input in 4 roads.Each road input support voice incentive functions of 12 tunnel balance inputs, wherein the input of single channel microphone is supported on 8 tunnels, single channel bundlees respectively voice-activated instruction; Two microphone inputs are supported respectively on other 4 tunnels, a voice-activated instruction of every two-way binding.Audio mixing input is all supported in the 4 non-equilibrium inputs in road, and the input volume on each road can regulate.Audio frequency importation has utilized operational amplifier to amplify signal, and MCU can carry out by control figure potentiometer the volume on each road of independent regulation.Described digital regulation resistance comprises analyzing audio signal independently to the independent regulation of audio signal, adopt the method for automatic gain control, described automatic gain control is a degeneration factor, and it can be divided into gain controlled amplifying circuit and control voltage forming circuit two parts.Gain controlled amplifying circuit is positioned at forward and amplifies path, and its gain changes with controlling voltage.The basic element of character of controlling voltage forming circuit is after detector and low pass smoothing filter, sometimes also comprises the parts such as gate circuit and direct current amplifier.The output signal u0 of amplifying circuit, through detection and after filter filtering low frequency modulations component and noise, produces the voltage uc in order to ride gain controlled amplification device.In the time that input signal ui increases, u0 and uc also increase thereupon.Uc increases declines the gain of amplifying circuit, thereby makes the variable quantity of output signal significantly be less than the variable quantity of input signal, reaches the object of automatic gain control.The control method of amplifying circuit gain has: 1. change transistorized DC operation state, to change transistorized currentamplificationfactorβ.2. at different levels insertion voltage-controlled attenuators of amplifier.3. make amplifier load etc. with automatically controlled variable resistor.Automatic gain control circuit is widely used in various receivers, recorder and measuring instrument, and it is often used to make the output level of system to keep within the specific limits, thereby also claims automatic electric-level control; During for voice amplifier or broadcast receiver, be called automatic volume control.Automatic gain control circuit comprises two kinds of control modes: a kind of is to utilize to increase mode that the mode of AGC voltage reduces gain forward AGC, a kind of is that to utilize the mode that reduces AGC voltage to reduce the mode of gain strong reverse AGC. forward AGC control ability, the large controlled amplifying stage of required power ratio control working point mobility scale is large, and amplifier two ends impedance variation is also large; Oppositely the required power ratio control of AGC is little, and control range is also little.
Described MCU device 102 comprises MCU and power down storage chip, described MCUMCU has adopted the stm32 series processors of STMicw Electronics, can meet the requirement of whole audio frequency processing array, for the treatment of the input and output of audio signal, described processing comprises the processing to input and the processing to output, the described processing to input refers to that MCU device 102 is on the basis of frequency division, the method of sampling by intermittence is divided into the sound of whole section in the sample that can describe sound wave, judge whether the audio mixing mark in parameter preset is true, then sample is carried out to audio mixing operation, the processing of described output comprises, by multichannel voice frequency output sample, the multichannel voice frequency of passing through that the pointer that points to sample is saved to MCU device is asynchronously exported simultaneously, or the server to far-end by Sample preservation asynchronously, the described asynchronous transmission of non-synchronously carrying out data that refers to, described power down storage chip is used for preserving parameters, and obtain parameter preset by carrying out communication with host computer.
Described communicator 103 comprises the serial communication interface of at least 2 kinds, is respectively used to the Control on Communication between main control computer or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.Described Control on Communication comprises between each master computer, between master computer and remote data terminal, and the device controlled of transfer of data between each remote data terminal and exchange.The communication control processor of difference in functionality can connect into computer communication network many master computers, communication line and a lot of user terminal, makes these users can use the computer in net, shared resource simultaneously.Communication control processor communication control processor communication control processor can ensure that data and information correctly effectively send, transmit, receive and processes by various communication protocol and interface agreement; Make master computer or user terminal all be convenient to access neatly computer communication network, do not need for this reason and revise network design, Computer Design and user terminal design; Make master computer remove network control task, have the more time to go to carry out main work for the treatment of.Communication process function is separated from the information processing of master computer, made master computer avoid changing terminal type, circuit types, transmission means and procotol etc.Its basic function is: 1. circuit control: control the break-make, line termination device of communication line as the interface of code modulation decoder, monitoring wire state etc.2. terminal control: selection, connection and the release of terminal, the conversion of coding etc.3. organize multichannel communication: correctly sending computer to from the data of each communication line simultaneously; Give corresponding communication line the data allocations from computer.4. the combination of character and decomposition: give computer the code that becomes to walk abreast of the serial code assembly from communication line; Give communication line resolving into serial code from the parallel code of computer.5. transmission is controlled: executive communication code, the i.e. data link layer protocol of network node function.This code specifies between two neighborhood of nodes, to carry out on single link the rule of transfer of data, comprises data encoding, the method for synchronization, information format, operating procedure etc.6. the adjusting of transmission speed and data buffering: the data transmission rate on communication line, generally lower than the input and output transfer rate of computer, need to arrange buffer with governing speed while having many communication lines.7. message processing: the automatic numbering of message, combination collect, analyze editor, exchange record, error diagnosis etc.8. mistake processing: adopt effective error-detecting and bearing calibration, find and correct the mistake occurring on communication line, by all the other various mistakes of measure control such as mistake recovery routine, retries.
Apparatus for processing audio also comprises audio output device 104, described audio output device 104 comprises the audio frequency output at least 2 tunnels, described audio frequency output also comprises four path analoging switch chip controls devices and the second operational amplifier, described four path analoging switch chip controls devices are used as an analog switch, or as the bus switch of a low delay.Support high-frequency application in the high bandwidth performance of 300MHz.Break through first two section elimination function two switches of signal interruption from prevent handoff procedure and be activated simultaneously, thereby reach the object of selecting input source for increasing income by MCU control simulation; Described the second operational amplifier carries out amplification again for the audio frequency that described audio frequency is exported.Described audio output device 104 also comprises the following steps: that the audio signal of being exported by audio output device 104, under the control of MCU device 102, exports loudspeaker to or is saved to the far-end server being positioned on network.
Apparatus for processing audio also comprises audio signal processor 105, and described audio signal processor 105 is processed for the audio signal that described voice input device 101 is inputted, and comprises utter long and high-pitched sounds restraining device and rise cancellation element; The described restraining device of uttering long and high-pitched sounds is for suppressing to comprise uttering long and high-pitched sounds and local noise of being caused by feedback, and when the sound feeding back and original sound compress or expanded this air simultaneously, we claim feedback sound and original sound phase place " homophase ", and this sound increases; On the contrary, if another sound has but been expanded the air of this point when this air of sound compression, we claim this two sound phase places " anti-phase ", this sound reduction.Visible after original sound and feedback sound or direct sound wave and reflected sound aloft meet, make on earth volume increased, still reduced, the phase place between this and its is closely related.Phase shifter is the accumulation process of establishing based on being destroyed room peak dot and uttered long and high-pitched sounds by the phase place that changes input signal just, forms acoustic feedback condition thereby destroy; Described echo cancellation module reenters the echo interference of described voice input device 101 for preventing the audio signal of output.Echo cancellation module is processed input signal constantly.Upgrade H buffer according to each new sampled data.This new sampled data can be assigned to a weight weight, and this weight can determine the data whichever outbalance of both having deposited in it and buffer.This weight is commonly called adaptive gain adaptation gain, step sizes step size or forgetting factor forgetting factor.In the time conversing at the beginning or echo path change after, this yield value should be able to be larger, its objective is and will allow buffer approach rapidly echo path instantly.Approach rapidly in first convergence period P0 of echo path instantly at buffer, the error comprising in its buffer should be minimum, because there is minimum noise content in Sin signal.Due to similar reason, in centre convergence period P1, the error that its buffer comprises should be maximum, because it exists maximum noise content.The error of last period P2 should be to fall between.Apparently, a good sef-adapting filter should be selected the buffer being produced by period P0, processes afterwards as long as it has completed the 1024th sampling on immediately for line; Should be abandoned by Homes by the buffer that the P1 period produces because in the P1 period because noise forms very large error; Finally, produce H buffer by the P2 period, its amplitude with after the P0 period, be that on adopted line, buffer has very large difference, therefore it should replace on line buffer to reflect the change of echo path.
The present embodiment has also comprised a kind of audio-frequency processing method of applying above-mentioned apparatus for processing audio, comprises following concrete steps:
Audio frequency input step: use digital regulation resistance respectively the audio signal being imported by audio frequency input to be regulated independently; Use the first operational amplifier to amplify the audio signal after regulating.
MCU controls step: use the input and output of MCU audio signal, a storage chip that makes to use up is preserved parameters, and obtains parameter preset by carrying out communication with host computer.
Communication steps: use respectively communicating by letter between different serial communication interface control main control computers or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.
Apparatus for processing audio according to claim 4, is characterized in that, also comprises audio frequency output step: thus described four path analoging switch chip controls devices are increased income and are reached the object of selecting input source by MCU control simulation; The audio frequency of described audio frequency being exported by described the second operational amplifier carries out amplification again.
Apparatus for processing audio according to claim 4, it is characterized in that, also comprise Audio Signal Processing step: the audio signal that described voice input device 101 is inputted is processed, comprise that the restraining device of uttering long and high-pitched sounds described in use suppresses to comprise uttering long and high-pitched sounds and local noise of being caused by feedback, and the echo that uses described echo cancellation module to prevent that the audio signal of output from reentering described voice input device 101 is disturbed.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (7)
1. an apparatus for processing audio, is characterized in that, for the speech audio collection in high background noise and less space, comprises power supply, voice input device (101), MCU device (102) and communicator (103); Wherein,
Described power supply is for providing electric power to described voice input device (101), MCU device (102) and communicator (103);
Described voice input device (101) comprises the audio frequency input at least 2 tunnels, also comprises the digital regulation resistance that can regulate independently audio signal and the first operational amplifier that signal is amplified;
Described MCU device (102) comprises MCU and power down storage chip, and described MCU is for the treatment of the input and output of audio signal, and described power down storage chip is used for preserving parameters, and obtains parameter preset by carrying out communication with host computer;
Described communicator (103) comprises the serial communication interface of at least 2 kinds, is respectively used to the Control on Communication between main control computer or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.
2. apparatus for processing audio according to claim 1, it is characterized in that, also comprise audio output device (104), described audio output device (104) comprises the audio frequency output at least 2 tunnels, described audio frequency output also comprises four path analoging switch chip controls devices and the second operational amplifier, thereby described four path analoging switch chip controls devices reach for increasing income by MCU control simulation the object of selecting input source; Described the second operational amplifier carries out amplification again for the audio frequency that described audio frequency is exported.
3. apparatus for processing audio according to claim 2, it is characterized in that, described audio output device (104) also comprises the following steps: that the audio signal of being exported by audio output device (104), under the control of MCU device (102), exports loudspeaker to or is saved to the far-end server being positioned on network.
4. apparatus for processing audio according to claim 1, it is characterized in that, also comprise audio signal processor (105), described audio signal processor (105) is processed for the audio signal that described voice input device (101) is inputted, and comprises utter long and high-pitched sounds restraining device and rise cancellation element; The described restraining device of uttering long and high-pitched sounds is for suppressing to comprise uttering long and high-pitched sounds and local noise of being caused by feedback; Described echo cancellation module reenters the echo interference of described voice input device (101) for preventing the audio signal of output.
5. an audio-frequency processing method for the apparatus for processing audio described in application rights requirement 1-4, is characterized in that, comprises following concrete steps:
Audio frequency input step: use digital regulation resistance respectively the audio signal being imported by audio frequency input to be regulated independently; Use the first operational amplifier to amplify the audio signal after regulating;
MCU controls step: use the input and output of MCU audio signal, a storage chip that makes to use up is preserved parameters, and obtains parameter preset by carrying out communication with host computer;
Communication steps: use respectively communicating by letter between different serial communication interface control main control computers or other host computers and described apparatus for processing audio, and communication between described apparatus for processing audio.
6. apparatus for processing audio according to claim 5, is characterized in that, also comprises audio frequency output step: thus described four path analoging switch chip controls devices are increased income and are reached the object of selecting input source by MCU control simulation; The audio frequency of described audio frequency being exported by described the second operational amplifier carries out amplification again.
7. apparatus for processing audio according to claim 5, it is characterized in that, also comprise Audio Signal Processing step: the audio signal that described voice input device (101) is inputted is processed, comprise that the restraining device of uttering long and high-pitched sounds described in use suppresses to comprise uttering long and high-pitched sounds and local noise of being caused by feedback, and the echo that uses described echo cancellation module to prevent that the audio signal of output from reentering described voice input device (101) is disturbed.
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