CN103873977A - Recording system and method based on multi-microphone array beam forming - Google Patents
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Abstract
The invention discloses a recording system and method based on multi-microphone array beam forming. The recording system based on multi-microphone array beam forming comprises multiple microphones used for collecting external voice signals, an analog-digital conversion device, a voice frequency digital signal processing device and an output device in a sequential connection mode. The recording direction can be changed in real time, only voice at a certain angle can be recorded, and the mode that other human voice and background noise excepting the voice at the certain angle are effectively eliminated is set. Meanwhile, it is unnecessary to change the position and the direction of a mobile terminal to deliberately get the mobile terminal close to the needed voice, so that the good effect of recording within 5 meters at the maximum is achieved.
Description
Technical field
The present invention relates to mobile terminal recording technology field, in particular a kind of recording system and its implementation being shaped based on multi-microphone array beams.
Background technology
Along with popularizing fast of mobile terminal, user is more and more higher for function and the intelligentized requirement of equipment, how to make mobile terminal more intelligent, specialized, variation, and be used in more efficiently in daily life, one of current research direction become.
Such as: all standard configuration sound-recording functions of all mobile terminals substantially.But there is the shortcomings such as quality cannot ensure, function dullness in the function of the recording on existing mobile terminal, causes this function to become chicken ribs completely with respect to other special sound pick-up outfits.
The higher electric property having in view of MEMS (Micro-Electro-Mechanical Systems MEMS (micro electro mechanical system)) microphone and higher audio performance, can promote recording quality, and it more and more uses on mobile terminal.
In prior art, there is the mobile terminal that uses four omni-directional microphone, by being designed, the position of microphone utilizes the computational analysis of audio frequency coprocessor to the environmental noise entering simultaneously, eliminate unwanted environmental noise, thereby further promote recording quality.But still there is certain weak point in such scheme: when in the situation that mobile terminal does not move, while only wanting to record the sound in needed someone's sound or certain angle, just become some difficulty.
There are at present four omni-directional microphone of use and their position is designed and utilized the computational analysis of audio frequency coprocessor to the environmental noise entering simultaneously, and eliminating unwanted environmental noise, can further promote the solution of recording quality.Although this method has started generally to use.But the in the situation that of mobile hand-held device not, only think the sound in the own required someone's of record sound or certain angle, just become some difficulty.
In view of this, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of recording system and its implementation being shaped based on multi-microphone array beams, when solution available technology adopting mobile terminal is recorded, cannot change recording direction.And only record the sound of certain angle, thereby the problem of making troubles to user.
In order to achieve the above object, the present invention has taked following technical scheme:
The recording system being shaped based on multi-microphone array beams, wherein, comprising:
Several are for gathering the microphone of external sound signal;
For the external sound signal of each road microphone input being converted into separately to the analog-digital commutator of corresponding audio digital signals;
For each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, filter out the audio digital signal processing device of corresponding audio digital signals;
For exporting the output device of the audio digital signals after screening;
Described microphone, analog-digital commutator, audio digital signal processing device and output device are connected successively.
The described recording system being shaped based on multi-microphone array beams, wherein, also comprise that one for the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain and form the intensifier that special angle sound is strengthened.
The described recording system being shaped based on multi-microphone array beams, wherein, filters out corresponding audio digital signals and specifically comprises in described audio digital signal processing device:
Each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, pick out the mixed characteristic data of audio digital signals, and according to predefined angle threshold as restriction, audio digital signals is screened, retain the audio digital signals within the scope of described angle threshold, the extraneous audio digital signals of described angle threshold is carried out to anti-ripple inhibition and filtration.
The described recording system being shaped based on multi-microphone array beams, wherein, the number of described microphone is 4, and it comprises: be arranged on the first microphone and the second microphone in mobile terminal front, and be arranged on the 3rd microphone and the 4th microphone at the mobile terminal back side;
Wherein, the distance between described the first microphone and second microphone is between 100mm and 150mm; Distance between described the 3rd microphone and the 4th microphone is between 100mm and 150mm; Distance between described the first microphone and the 3rd microphone is greater than 18mm; Distance between described second microphone and the 4th microphone is greater than 18mm.
The described recording system being shaped based on multi-microphone array beams, wherein, described mobile terminal is mobile phone.
The way of recording being shaped based on multi-microphone array beams, wherein, said method comprising the steps of:
S1, gather external sound signal by several microphones;
S2, the external sound signal that each road microphone is inputted are converted into separately corresponding audio digital signals;
S3, make each railway digital voice signal with set in advance according to beam forming algorithm set up mathematical model compare, filter out corresponding audio digital signals;
Audio digital signals after S4, output screening.
The described way of recording being shaped based on multi-microphone array beams, wherein, after described step S3, also comprise step S31 before step S4, the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain forms the intensifier that special angle sound is strengthened.
The described way of recording being shaped based on multi-microphone array beams, wherein, filters out corresponding audio digital signals and specifically comprises in described step S2:
Each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, pick out the mixed characteristic data of audio digital signals, and according to predefined angle threshold as restriction, audio digital signals is screened, retain the audio digital signals within the scope of described angle threshold, the extraneous audio digital signals of described angle threshold is carried out to anti-ripple inhibition and filtration.
The described way of recording being shaped based on multi-microphone array beams, wherein, the number of described microphone is 4, and it comprises: be arranged on the first microphone and the second microphone in mobile terminal front, and be arranged on the 3rd microphone and the 4th microphone at the mobile terminal back side;
Wherein, the distance between described the first microphone and second microphone is between 100mm and 150mm; Distance between described the 3rd microphone and the 4th microphone is between 100mm and 150mm; Distance between described the first microphone and the 3rd microphone is greater than 18mm; Distance between described second microphone and the 4th microphone is greater than 18mm.
The described way of recording being shaped based on multi-microphone array beams, wherein, described mobile terminal is mobile phone.
Compared to prior art, recording system and its implementation being shaped based on multi-microphone array beams provided by the invention, can change recording direction in real time.And can only record the sound of certain angle, other voice and the background noise that arrange outside this angle are all eliminated effectively.Meanwhile, do not need position and direction by changing mobile terminal to carry out the deliberately acoustic distance near point from needs by mobile terminal yet, thereby realize the effect of the better recording in maximum 5 meters.
Brief description of the drawings
Fig. 1 is the structured flowchart of the recording system being shaped based on multi-microphone array beams provided by the invention.
Fig. 2 a eliminates the sound disturbing and the effect schematic diagram that special angle sound is strengthened in the first embodiment of recording system being shaped based on multi-microphone array beams provided by the invention.
Fig. 2 b eliminates the sound disturbing and the effect schematic diagram that special angle sound is strengthened in the second embodiment of recording system being shaped based on multi-microphone array beams provided by the invention.
Fig. 3 a is the schematic diagram of the first microphone and second microphone in the embodiment of recording system being shaped based on multi-microphone array beams provided by the invention.
Fig. 3 b is the schematic diagram of the 3rd microphone and the 4th microphone in the embodiment of recording system being shaped based on multi-microphone array beams provided by the invention.
Fig. 4 is the flow chart of the way of recording being shaped based on multi-microphone array beams provided by the invention.
Embodiment
The invention provides a kind of recording system and its implementation being shaped based on multi-microphone array beams.For making object of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
First, introduce multi-microphone array beams forming technique (also claiming Beam forming technology).Its general principle is as follows: regulate separately phase place and the wave amplitude of each unit received signal in multi-microphone array, make to combine that output is upper can obtain the maximum signal to noise ratio in certain direction, be similar to the mode of employing bandpass filtering, extract desired signal in frequency domain.But to the beam forming of microphone array, work, occurring in spatial domain, normally can be configured to all directions.Because everyone answers the Fourier of static measurement value to change to different distance and the left ear of sound that direction receives and auris dextra pulsion phase, binaural sound is differential and the ears time difference is all variant, thereby the scope in region and the differentiation meeting in orientation that can cause people to form at identification light beam are variant.Thereby by the way that gathers and classify for these otherness data, and a new mathematical model of setting up, the impact of having avoided the difference of head movement or number of people form and organ site to cause.
Refer to Fig. 1, it is the structured flowchart of the recording system being shaped based on multi-microphone array beams provided by the invention.As shown in the figure, the described recording system being shaped based on multi-microphone array beams comprises: several microphones 100, analog-digital commutator 200, audio digital signal processing device 300 and output device 400; Described microphone 100, analog-digital commutator 200, audio digital signal processing device 300 and output device 400 are connected successively.
Specifically, microphone 100 is for gathering external sound signal, and wherein, external sound signal comprises: voice and noise (wherein, described noise comprises: the low frequency noise that echo, reverberation and needs filter etc.).Described analog-digital commutator 200 is for being converted into separately corresponding audio digital signals by the external sound signal of each road microphone input, here be that analog-digital commutator is that each road external sound signal is carried out to independent sampling processing (analog signal turns the sampling of digital signal) with should be noted that.Audio digital signal processing device 300, for each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, filters out corresponding audio digital signals.Due to the free territory of each audio digital signals signal and spatial domain.Each railway digital voice signal all needs to compare with the mathematical model providing in algorithm, picks out the roughly direction of sound, position, loudness, background, quality, distance, the data of the most mixed characteristic such as tone.Introduced know-why about described beam forming algorithm above.Described output device 400 is for exporting the audio digital signals after screening.
Further, can also comprise that one for the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain and form the intensifier that special angle sound is strengthened.
Can only record the sound of certain angle by the recording system being shaped based on multi-microphone array beams of the present invention, other voice and the background noise that arrange outside this angle are all eliminated effectively.Sound in the angle that output can easier identification from hearer be supported, has filtered voice and the environmental noise of the angle of not supporting.Thereby form the effect that special angle sound is strengthened, thereby the sound of realizing in the longer-distance angle arranging at oneself is strengthened.
Illustrate it is how to eliminate the sound disturbing and special angle sound is strengthened below by diagram.As shown in Figure 2 a, arrange and need the sound of admission at 0 degree, intruder's sound is at 50 degree.The intensity of boosting of the angle of the strengthening voice that circular diagram and petal shape representation can be supported and in real time sound :-30 degree are to 30 degree, and 60 degree are to 120 degree ,-150 degree are to 150 degree and-60 degree to-120 degree.Object sound in this region can amplify, and angle sound in addition can filter deletion.So realize the selective recording of the specific region of certain or multiple directions.As shown in Figure 2 b, arrange and need the sound of admission at 0 degree, intruder's sound is at 950 degree.Circular diagram and petal shape, represent and support angle-60 degree that strengthening recording is supported to spend to 120 degree to 60 degree and-120, in like manner thereby the sound of this angle can be by amplifying recording to the processing of phase place and amplitude, other region need to be filtered or interference-shielded sound, can find out from petal shape: support that angle has obtained effective amplification.Other angle sound pressure level is smaller.
Further, in the present embodiment, when the number of described microphone is 4, it comprises: be arranged on mobile terminal 1(in the present embodiment, described mobile terminal is mobile phone) positive the first microphone 10 and second microphone 20, and be arranged on the 3rd microphone 30 and the 4th microphone 40 at the mobile terminal back side; As shown in Fig. 3 a and 3b.
Show by experiment: the distance between described the first microphone 10 and second microphone 20 is between 100mm and 150mm; Distance between described the 3rd microphone 30 and the 4th microphone 40 is between 100mm and 150mm; Distance between described the first microphone 10 and the 3rd microphone 30 is greater than 18mm; Best results when distance between described second microphone 20 and the 4th microphone 40 is greater than 18mm.
The present invention also provides a kind of way of recording being shaped based on multi-microphone array beams, as shown in Figure 4, said method comprising the steps of:
S1, gather external sound signal by several microphones;
S2, the external sound signal that each road microphone is inputted are converted into separately corresponding audio digital signals;
S3, make each railway digital voice signal with set in advance according to beam forming algorithm set up mathematical model compare, filter out corresponding audio digital signals;
Audio digital signals after S4, output screening.
Further, after described step S3, also comprise step S31 before step S4, the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain forms the intensifier that special angle sound is strengthened.
Further, in described step S2, filtering out corresponding audio digital signals specifically comprises:
Each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, pick out the mixed characteristic data of audio digital signals, and according to predefined angle threshold as restriction, audio digital signals is screened, retain the audio digital signals within the scope of described angle threshold, the extraneous audio digital signals of described angle threshold is carried out to anti-ripple inhibition and filtration.
Further, the number of described microphone is 4, and it comprises: be arranged on the first microphone and the second microphone in mobile terminal front, and be arranged on the 3rd microphone and the 4th microphone at the mobile terminal back side; Wherein, the distance between described the first microphone and second microphone is between 100mm and 150mm; Distance between described the 3rd microphone and the 4th microphone is between 100mm and 150mm; Distance between described the first microphone and the 3rd microphone is greater than 18mm; Distance between described second microphone and the 4th microphone is greater than 18mm.
The concrete ins and outs of above-mentioned each step are all described in detail in said system, here superfluous having stated no longer just.
In sum, recording system and its implementation being shaped based on multi-microphone array beams provided by the invention, wherein, the described recording system being shaped based on multi-microphone array beams comprises: several are for gathering microphone, analog-digital commutator, audio digital signal processing device and the output device of external sound signal; Described microphone, analog-digital commutator, audio digital signal processing device and output device are connected successively.Can change in real time recording direction.And can only record the sound of certain angle, other voice and the background noise that arrange outside this angle are all eliminated effectively.Meanwhile, do not need position and direction by changing mobile terminal to carry out the deliberately acoustic distance near point from needs by mobile terminal yet, thereby realize the effect of the better recording in maximum 5 meters.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. the recording system being shaped based on multi-microphone array beams, is characterized in that, comprising:
Several are for gathering the microphone of external sound signal;
For the external sound signal of each road microphone input being converted into separately to the analog-digital commutator of corresponding audio digital signals;
For each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, filter out the audio digital signal processing device of corresponding audio digital signals;
For exporting the output device of the audio digital signals after screening;
Described microphone, analog-digital commutator, audio digital signal processing device and output device are connected successively.
2. the recording system being shaped based on multi-microphone array beams according to claim 1, it is characterized in that, also comprise that one for the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain and form the intensifier that special angle sound is strengthened.
3. the recording system being shaped based on multi-microphone array beams according to claim 1 and 2, is characterized in that, filters out corresponding audio digital signals and specifically comprise in described audio digital signal processing device:
Each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, pick out the mixed characteristic data of audio digital signals, and according to predefined angle threshold as restriction, audio digital signals is screened, retain the audio digital signals within the scope of described angle threshold, the extraneous audio digital signals of described angle threshold is carried out to anti-ripple inhibition and filtration.
4. the recording system being shaped based on multi-microphone array beams according to claim 1, it is characterized in that, the number of described microphone is 4, it comprises: be arranged on the first microphone and the second microphone in mobile terminal front, and be arranged on the 3rd microphone and the 4th microphone at the mobile terminal back side;
Wherein, the distance between described the first microphone and second microphone is between 100mm and 150mm; Distance between described the 3rd microphone and the 4th microphone is between 100mm and 150mm; Distance between described the first microphone and the 3rd microphone is greater than 18mm; Distance between described second microphone and the 4th microphone is greater than 18mm.
5. the recording system being shaped based on multi-microphone array beams according to claim 4, is characterized in that, described mobile terminal is mobile phone.
6. the way of recording being shaped based on multi-microphone array beams, is characterized in that, said method comprising the steps of:
S1, gather external sound signal by several microphones;
S2, the external sound signal that each road microphone is inputted are converted into separately corresponding audio digital signals;
S3, make each railway digital voice signal with set in advance according to beam forming algorithm set up mathematical model compare, filter out corresponding audio digital signals;
Audio digital signals after S4, output screening.
7. the way of recording being shaped based on multi-microphone array beams according to claim 6, it is characterized in that, after described step S3, also comprise step S31 before step S4, the audio digital signals after screening is increased to intensity of sound by its phase place of dynamic reinforcement and amplitude, thereby and re-establish virtual digital space territory and time-domain forms the intensifier that special angle sound is strengthened.
8. the way of recording being shaped based on multi-microphone array beams according to claim 6, is characterized in that, filters out corresponding audio digital signals and specifically comprise in described step S2:
Each railway digital voice signal and the mathematical model of setting up according to beam forming algorithm setting in advance are compared, pick out the mixed characteristic data of audio digital signals, and according to predefined angle threshold as restriction, audio digital signals is screened, retain the audio digital signals within the scope of described angle threshold, the extraneous audio digital signals of described angle threshold is carried out to anti-ripple inhibition and filtration.
9. the way of recording being shaped based on multi-microphone array beams according to claim 6, it is characterized in that, the number of described microphone is 4, it comprises: be arranged on the first microphone and the second microphone in mobile terminal front, and be arranged on the 3rd microphone and the 4th microphone at the mobile terminal back side;
Wherein, the distance between described the first microphone and second microphone is between 100mm and 150mm; Distance between described the 3rd microphone and the 4th microphone is between 100mm and 150mm; Distance between described the first microphone and the 3rd microphone is greater than 18mm; Distance between described second microphone and the 4th microphone is greater than 18mm.
10. the way of recording being shaped based on multi-microphone array beams according to claim 9, is characterized in that, described mobile terminal is mobile phone.
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