CN114051195A - Far and near field self-adaptive pickup - Google Patents
Far and near field self-adaptive pickup Download PDFInfo
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- CN114051195A CN114051195A CN202111401801.5A CN202111401801A CN114051195A CN 114051195 A CN114051195 A CN 114051195A CN 202111401801 A CN202111401801 A CN 202111401801A CN 114051195 A CN114051195 A CN 114051195A
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- 230000005236 sound signal Effects 0.000 claims abstract description 26
- 230000003750 conditioning effect Effects 0.000 claims abstract description 19
- 230000003044 adaptive effect Effects 0.000 claims abstract description 15
- 230000004927 fusion Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 description 9
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more 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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a far and near field self-adaptive sound pick-up, which comprises: the microphone group is used for collecting sound signals; the microphone set comprises a near-field microphone for collecting a near-field sound signal and a far-field microphone for collecting a far-field sound signal; the conditioning module is connected with the microphone set and used for amplifying the sound signals; the processing module is connected with the conditioning module and is used for carrying out amplitude comparison, logic processing and sound mixing processing on the amplified sound signals; and the output driving module is connected with the processing module and used for outputting the processed signals. The invention realizes the voice information fusion of far and near fields by utilizing the array technology of the far field and the near field and the circuit multi-threshold self-adaptive technology, reduces the design complexity, is convenient to deploy and has stronger adaptive capacity.
Description
Technical Field
The invention relates to the technical field of audio acquisition, in particular to a far-near field self-adaptive sound pickup.
Background
Microphone technology, while now advanced to a more sophisticated stage, still presents problems. On one hand, far field and near field are difficult to be considered in the microphone selection aspect, if a microphone with higher sensitivity is adopted, far field sound can be better picked up, but the problems of near field saturation and larger background sound are easy to generate; if a microphone with lower sensitivity is adopted, near-field sound can be better picked up, the signal-to-noise ratio of the near-field sound is improved, but the far-field sound picking-up capability is weaker. Thus, for both near and far field applications, either collocated applications or unique microphone gain control techniques must be used. On the other hand, if adaptive control is implemented, algorithm processing is mostly adopted, and the algorithm usually needs to use a DSP or a microprocessor with higher performance, which further causes a power consumption problem and is not beneficial to miniaturization and embedded implementation.
Disclosure of Invention
The invention aims to provide a far-near field self-adaptive pickup, which utilizes a far-field microphone array, a near-field microphone array and a circuit self-adaptive selection switching technology to realize circuit judgment, selection and superposition processing of multi-path voice signals and realize a better tone quality effect.
In order to achieve the purpose, the invention provides the following scheme:
a near-far field adaptive pickup comprising:
the microphone group is used for collecting sound signals; the microphone set comprises a near-field microphone for collecting a near-field sound signal and a far-field microphone for collecting a far-field sound signal;
the conditioning module is connected with the microphone set and used for amplifying the sound signals;
the processing module is connected with the conditioning module and is used for carrying out amplitude comparison, logic processing and sound mixing processing on the amplified sound signals;
and the output driving module is connected with the processing module and used for outputting the processed signals.
Optionally, the conditioning module employs an amplifier.
Optionally, the processing module includes a comparison circuit, a switching logic circuit, and a mixing circuit, which are connected in sequence.
Optionally, the comparison circuit employs a dual threshold comparator.
Optionally, the switching logic circuit employs a 2-4 decoder, an input of the 2-4 decoder is an output signal of the dual-threshold comparator, and an output of the 2-4 decoder is a gain control signal; the gain control signals include a far-field microphone gain control signal and a near-field microphone gain control signal.
Optionally, the mixing circuit performs mixing processing on the amplified sound signal according to the gain control signal.
Optionally, the audio mixing circuit includes an amplifier, a plurality of control resistors, an analog switch, and an adder, and an input of the amplifier is an output signal of the conditioning module; the analog switch is connected with the control resistor and realizes gain control on the sound signal by conducting different control resistors; the adder is respectively connected with the output end of the control resistor and the output end of the amplifier and used for mixing the output signal of the control resistor and the output signal of the amplifier.
Optionally, the output driver module is a LINEOUT driver or a headphone driver.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention adopts microphones with different sensitivities and layouts at the front end part to ensure that near-field and far-field signals are picked up physically. The near-field microphone is preferably low-sensitive, and the far-field microphone is preferably high-sensitive. The output of the microphone is connected with the conditioning module, so that signal conditioning amplification, filtering processing and the like are realized, and weak signals are converted into electrical signals with higher amplitude. The processing module is a core circuit of the invention, realizes the self-adaptive processing of far and near fields through circuit processing, covers the functions of amplitude comparison, logic processing, sound mixing processing and the like, and sends signals to the output module. The output module realizes format conversion, driving amplification and the like of signals. The invention realizes the voice information fusion of far and near fields by utilizing the array technology of the far field and the near field and the circuit multi-threshold self-adaptive technology, reduces the design complexity, is convenient to deploy and has stronger adaptive capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a near-far field adaptive sound pickup according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a near-far field adaptive pickup according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a comparison circuit and a switching logic circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a mixing circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a far-near field self-adaptive pickup, which utilizes a far-field microphone array, a near-field microphone array and a circuit self-adaptive selection switching technology to realize circuit judgment, selection and superposition processing of multi-path voice signals and realize a better tone quality effect.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a far-near field adaptive sound pickup, including:
the microphone group 1 is used for collecting sound signals; the microphone set comprises a near-field microphone for collecting a near-field sound signal and a far-field microphone for collecting a far-field sound signal. Low sensitivity is preferred for near field microphones and high sensitivity is preferred for far field microphones.
And the conditioning module 2 is connected with the microphone set 1 and is used for amplifying the sound signals. Realize signal conditioning amplification, filtering processing and the like, and convert weak signals into electrical signals with higher amplitude
And the processing module 3 is connected with the conditioning module 2 and is used for performing amplitude comparison, logic processing and sound mixing processing on the amplified sound signal.
And the output driving module 4 is connected with the processing module 3 and is used for outputting the processed signals and realizing format conversion, driving amplification and the like of the signals. The output driver module 4 is typically a LINEOUT driver or a headphone driver or the like.
As shown in fig. 2, as a specific example, the near-field MIC and the far-field MIC are each different mainly in sensitivity for picking up sound signals different in distance. The conditioning module 2 employs an amplifier. The amplifier is used for carrying out circuit amplification on the weak signal output by the microphone, so that the amplifier is suitable for carrying out subsequent processing of a circuit.
The processing module 3 comprises a comparison circuit, a switching logic circuit and a mixing circuit which are connected in sequence. The comparison circuit is used for realizing threshold comparison, judging whether the output signal of the microphone exceeds upper and lower limits or not and judging the validity of the signal. The comparison circuit may be implemented using a comparator in an analog circuit. Because of the adoption of the double-threshold method of the upper and lower limits, two comparators are needed to respectively compare the upper and lower thresholds, thereby obtaining the indication signal of the input signal range of the microphone. In this example, there is one microphone in each of the near and far fields, and each microphone uses a dual threshold comparison circuit with upper and lower limits. Taking the near field microphone as an example, the output of the near field microphone is 2 signals through a dual threshold comparator (also called a window comparator in the circuit) for indicating three situations, namely exceeding the upper limit, being lower than the lower limit and being between the upper limit and the lower limit. As shown in fig. 2, where VN represents the threshold voltage of the near field microphone, in this example a double threshold is used, respectively an upper and a lower limit, respectively indicated by the suffix H/L. Fig. 3 is a specific schematic diagram of a comparator-based circuit. The output of the comparison circuit is 4 signals representing the signal strength of the near field and far field microphones.
The switching logic circuit adopts 2-4 decoders (a far-field 2-4 decoder and a near-field 2-4 decoder), realizes the judgment of the indicating signal output by the comparison circuit, is a digital circuit part, and generates a gain control signal for controlling the sound mixing circuit. The signal of the circuit is four inputs (output signal of double threshold comparator) and six outputs (gain control signal of far and near fields). The gain control signal is input from the comparator output according to two 2-4 decoders, and the output is the gain control signal of the near field and the far field MIC. The specific implementation aspect can be realized by adopting a CPLD/FPGA and a separate logic device. Fig. 3 is a schematic diagram of a logic switching circuit based on an FPGA.
The audio mixing circuit is used for further processing the amplified signals of the far-field and near-field microphones, realizing the functions of gain control, audio mixing, phase adjustment and the like, and outputting audio signals with the audio mixing completed. The circuit is realized by usually using an amplifying circuit and an analog switch, realizing audio processing by selecting a control resistor, controlling signal amplification times of a far-field MIC and a near-field MIC by a gain control signal, and realizing sound mixing superposition output by an adder at the rear end. As shown in fig. 4, the mixing circuit includes an amplifier, a plurality of control resistors R1 and R2, analog switches S1 and S2, and an adder, and the input of the amplifier is the output signal of the conditioning module 2; the analog switch realizes the gain control of the audio frequency by controlling the selection of the resistor; the adder is respectively connected with the output end of the control resistor and the output end of the amplifier and used for mixing the output signal of the control resistor and the output signal of the amplifier.
The front end part of the invention adopts microphones with different sensitivities and layouts to ensure that near-field and far-field signals are picked up physically. Low sensitivity is preferred for near field microphones and high sensitivity is preferred for far field microphones. The output of the microphone is connected with the conditioning module, so that signal conditioning amplification, filtering processing and the like are realized, and weak signals are converted into electrical signals with higher amplitude. The processing module is a core circuit of the invention, realizes the self-adaptive processing of far and near fields through circuit processing, covers the functions of amplitude comparison, logic processing, sound mixing processing and the like, and sends signals to the output circuit. The output module realizes format conversion, driving amplification and the like of signals.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A near-far field adaptive pickup, comprising:
the microphone group is used for collecting sound signals; the microphone set comprises a near-field microphone for collecting a near-field sound signal and a far-field microphone for collecting a far-field sound signal;
the conditioning module is connected with the microphone set and used for amplifying the sound signals;
the processing module is connected with the conditioning module and is used for carrying out amplitude comparison, logic processing and sound mixing processing on the amplified sound signals;
and the output driving module is connected with the processing module and used for outputting the processed signals.
2. The near-far field adaptive sound pickup according to claim 1, wherein the conditioning module employs an amplifier.
3. The adaptive far-near field pickup according to claim 1, wherein the processing module comprises a comparison circuit, a switching logic circuit and a mixing circuit connected in sequence.
4. The near-far field adaptive sound pickup according to claim 3, wherein the comparison circuit uses a double-threshold comparator.
5. The near-far field adaptive sound pick-up according to claim 4, wherein the switching logic circuit adopts a 2-4 decoder, the input of the 2-4 decoder is the output signal of the double-threshold comparator, and the output of the 2-4 decoder is a gain control signal; the gain control signals include a far-field microphone gain control signal and a near-field microphone gain control signal.
6. The near-far field adaptive sound pickup according to claim 5, wherein the sound mixing circuit performs sound mixing processing on the amplified sound signal according to the gain control signal.
7. The far-near field adaptive sound pickup according to claim 6, wherein the sound mixing circuit comprises an amplifier, a plurality of control resistors, an analog switch and an adder, and the input of the amplifier is the output signal of the conditioning module; the analog switch is connected with the control resistor and realizes gain control on the sound signal by conducting different control resistors; the adder is respectively connected with the output end of the control resistor and the output end of the amplifier and used for mixing the output signal of the control resistor and the output signal of the amplifier.
8. The near-far field adaptive sound pickup according to claim 1, wherein the output driving module is a LINEOUT drive or an earphone drive.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111401801.5A CN114051195A (en) | 2021-11-19 | 2021-11-19 | Far and near field self-adaptive pickup |
| ZA2022/12375A ZA202212375B (en) | 2021-11-19 | 2022-11-14 | Far and near field adaptive pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111401801.5A CN114051195A (en) | 2021-11-19 | 2021-11-19 | Far and near field self-adaptive pickup |
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| Publication Number | Publication Date |
|---|---|
| CN114051195A true CN114051195A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111401801.5A Pending CN114051195A (en) | 2021-11-19 | 2021-11-19 | Far and near field self-adaptive pickup |
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| CN (1) | CN114051195A (en) |
| ZA (1) | ZA202212375B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115134499A (en) * | 2022-06-28 | 2022-09-30 | 世邦通信股份有限公司 | Audio and video monitoring method and system |
-
2021
- 2021-11-19 CN CN202111401801.5A patent/CN114051195A/en active Pending
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2022
- 2022-11-14 ZA ZA2022/12375A patent/ZA202212375B/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115134499A (en) * | 2022-06-28 | 2022-09-30 | 世邦通信股份有限公司 | Audio and video monitoring method and system |
| CN115134499B (en) * | 2022-06-28 | 2024-02-02 | 世邦通信股份有限公司 | Audio and video monitoring method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA202212375B (en) | 2023-03-29 |
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