CN114401473B - Connection circuit, audio acquisition system and voice communication equipment - Google Patents
Connection circuit, audio acquisition system and voice communication equipment Download PDFInfo
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- CN114401473B CN114401473B CN202111632870.7A CN202111632870A CN114401473B CN 114401473 B CN114401473 B CN 114401473B CN 202111632870 A CN202111632870 A CN 202111632870A CN 114401473 B CN114401473 B CN 114401473B
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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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Abstract
The voice communication equipment comprises the audio acquisition system, wherein the audio acquisition system is provided with a plurality of microphone chips, audio signals output by the microphone chips are overlapped and integrated into a signal through the connection circuit, a differential device is arranged on at least one two branch nodes of the logic chain circuit of the audio signals which are integrated and connected by the connection circuit, and when the positive and negative of input signals on two branch paths of the two branch nodes are identical, an inverting circuit is arranged on an input path of an in-phase input end or an inverting input end of the differential device, and an overlapped signal without amplitude loss of the two input signals corresponding to the two branch nodes can be obtained at an output end of the differential device. The connecting circuit, the audio acquisition system and the voice communication equipment effectively reduce the parallel superposition loss of a plurality of audio signals output by a plurality of microphone chips through the logic chain circuit of the hardware circuit, and improve the pickup effect.
Description
Technical Field
The invention relates to the technical field of microphones, in particular to a connecting circuit, an audio acquisition system and voice communication equipment.
Background
A Microphone (Microphone) is an energy conversion device that converts sound signals into electrical signals, commonly known as a Microphone, also known as a Microphone, a Microphone. The microphones mainly include ECM (ELECTRET CAPACITANCE Microphone, electret condenser Microphone) microphones and MEMS (Micro-Electro-MECHANICAL SYSTEM, microelectromechanical system) microphones.
In some application scenarios, especially conference systems, the positions of the speakers are not fixed and are relatively scattered, and for speakers at different positions and at different distances, a single microphone is difficult to achieve a good global pickup effect, so that a plurality of microphones are generally used for respectively picking up sound signals of nearby speakers, and then the sound signals are respectively transmitted to a main chip to judge and process the input of the speaker, or the input of the speakers at all positions is picked up and amplified in a mode of a multi-microphone array plus algorithm.
The above modes are completed by matching with a signal processing chip and a voice processing algorithm, and have the advantages of higher cost, high development difficulty and long development period.
In order to achieve a strong signal for each position speaking, if the outputs of the microphones (MIC 1, MIC 2) at different positions are directly connected in parallel, as shown in fig. 1, the total output signal OUT is pulled down to a low amplitude by the low output of the microphone far from the sound source, and the desired effect is not achieved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a connection circuit, an audio acquisition system, and a voice communication apparatus, whereby superposition of outputs of multiple microphones is achieved by a simple hardware structure.
According to an aspect of the present invention, there is provided a connection circuit for transmission of an audio signal, comprising:
The plurality of input ends are used for accessing a plurality of audio signals, and the plurality of audio signals are positive signals;
Logic chain circuitry comprising a plurality of inputs for receiving said plurality of audio signals, and an output for providing an output signal, wherein,
The logic link circuit comprises a plurality of two-branch nodes, the amplitude of the output signal on the trunk path of the two-branch nodes is proportional to the sum of the amplitudes of the input signals on the two branch paths,
The logic chain circuit comprises at least one differentiator, the differentiator is arranged at a two-branch node of the logic chain circuit, the non-inverting input end and the inverting input end of the differentiator receive input signals on two branch paths of the two-branch node, the output end provides output signals on a trunk path of the two-branch node, and
When the positive and negative of the input signals on the two branch paths of the two branch nodes corresponding to the differentiator are the same, an inverting circuit is further arranged on the input path of the non-inverting input end or the inverting input end of the differentiator.
Optionally, at least one of the at least one differentiator is a differential amplifier.
Optionally, the inverting circuit comprises at least one of a triode, an operational amplifier chip and an inverter.
Optionally, the method further comprises:
And the preprocessing circuit is arranged on the access paths of the plurality of input ends.
Optionally, the preprocessing circuit includes at least one of a filter and an amplifier.
Optionally, the at least one differentiator comprises a plurality and is disposed at each of the plurality of secondary branch nodes.
According to another aspect of the present invention, there is provided an audio acquisition system comprising:
A plurality of microphone chips;
According to the connecting circuit provided by the invention, a plurality of output signals of the microphone chips are integrated into one audio signal output.
According to still another aspect of the present invention, there is provided a voice communication apparatus comprising:
The audio acquisition system provided by the invention.
The connecting circuit provided by the invention comprises a plurality of input ends and a logic chain circuit, wherein the logic chain circuit comprises a plurality of two-branch nodes, the two-branch nodes are provided with a differentiator, when the positive and negative polarities of input signals of two branch paths of the two-branch nodes are the same, the non-inverting input end or the inverting input end of the differentiator is provided with an inverting circuit, so that a superimposed signal with the amplitude consistent with the sum of the input signal amplitudes of the two branch paths is output at the output end of the differentiator, the lossless superposition of the amplitude of the input signal is realized through a hardware circuit, and convenience is provided for the lossless superposition of multiple audio signals.
The audio acquisition system provided by the invention comprises a plurality of microphone chips and the connecting circuit, wherein the output signals of the microphone chips are overlapped and integrated into a total output signal through the connecting circuit, and when any microphone chip has stronger output, the audio acquisition system can effectively pick up sound, so that the reliability of audio acquisition is ensured.
The voice communication equipment provided by the invention comprises the audio acquisition system provided by the invention, the plurality of microphone chips can effectively pick up sound sources in various different directions, and the voice communication quality is high.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic diagram of microphone output signal combining according to the prior art;
Fig. 2 shows a schematic configuration of a connection circuit according to a first embodiment of the present invention;
Fig. 3 shows a schematic configuration of a connection circuit according to a second embodiment of the present invention;
Fig. 4 shows a schematic configuration of a connection circuit according to a third embodiment of the present invention;
fig. 5 shows a schematic configuration of a connection circuit according to a fourth embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts. For clarity, the various features of the drawings are not drawn to scale.
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
Fig. 2 shows a schematic configuration of a connection circuit according to a first embodiment of the present invention.
As shown in fig. 2, the connection circuit 10 of the first embodiment of the present invention includes a first differentiator U1 and an inverter circuit 11, the inverter circuit 11 is disposed on an input path of an inverting input terminal of the differentiator U1, an output terminal of the first microphone chip MIC1 is connected to a non-inverting input terminal of the differentiator U1, an output terminal of the second microphone chip MIC2 is connected to an inverting input terminal of the differentiator U1 through the inverter circuit 11, and a total output signal OUT corresponding to a sum of an output signal of the first microphone chip MIC1 and an output signal of the second microphone chip MIC2 is obtained by making a difference between the output signal of the first microphone chip MIC1 and the output signal of the second microphone chip MIC2 through the connection circuit 10.
The connection circuit 10 of the embodiment of the invention simply realizes the addition function by utilizing the first differentiator U1 and the inverting circuit 11, and the obtained total output signal OUT corresponds to the sum of analog quantities of the input analog signals, so that the lower quantity in the input analog signals is prevented from being pulled down to the higher quantity, the total signal intensity of the integrated signals of a plurality of audio signals output by a plurality of microphone chips is ensured, and the integral pickup effect of the system is ensured.
In an alternative embodiment, the first differentiator U1 is a differential amplifier, and may further implement a pickup amplifying function at the same time, so as to further improve a pickup effect.
In the invention, the audio signals output by the microphone chip are all positive signals (namely, the audio signals directly output by the microphone chip are defined as positive signals in the text), and the positive signals are negative signals after being inverted by the inverting circuit; the non-inverting input end of the differentiator is connected with a positive signal, and the inverting input end is connected with a negative signal, so that the output signal is a positive signal; the non-inverting input end of the differentiator is connected with a negative signal, and the inverting input end is connected with a positive signal, so that the output signal is a negative signal. The positive and negative polarities of the access signals of the non-inverting input end and the inverting input end of each differentiator are opposite (the negative signals are obtained through the inverting circuit), so that the absolute values of the output signals of the differentiators correspond to the sum of the absolute values of the two input signals of the differentiators, and the addition function is realized.
In various embodiments of the present invention, the inverting circuit includes at least one of a triode, an operational amplifier chip, and an inverter, and is mainly used for converting a positive signal and a negative signal.
Fig. 3 shows a schematic structure of a connection circuit according to a second embodiment of the present invention.
As shown in fig. 3, the connection circuit 20 of the present embodiment includes four input terminals, which are connected to the output signals of the first to fourth microphone chips (MIC 1 to MIC 4), respectively, for integrating the output signals of the four microphone chips.
The connection circuit 20 of the present embodiment mainly includes a first differentiator U1, a second differentiator U2, a third differentiator U3, an inverter circuit 11, and an inverter circuit 12.
The output end of the first microphone chip MIC1 is connected to the non-inverting input end of the first differentiator U1, and the output end of the second microphone chip MIC2 is connected to the inverting input end of the first differentiator U1 through the inverting circuit 11, so that a first superposition signal is obtained at the output end of the first differentiator U1, and the first superposition signal corresponds to a superposition signal of the output signal of the first microphone chip MIC1 and the output signal of the second microphone chip MIC 2.
The output end of the third microphone chip MIC3 is connected to the inverting input end of the second differentiator U2, and the output end of the fourth microphone chip MIC4 is connected to the non-inverting input end of the second differentiator U2 through the inverting circuit 12, so as to obtain a second superimposed signal at the output end of the second differentiator U2, where the second superimposed signal is a negative signal, and corresponds to the negative phase of the superimposed signal of the output signal of the third microphone chip MIC3 and the output signal of the fourth microphone chip MIC 4.
The output end of the first differentiator U1 is connected to the non-inverting input end of the third differentiator U3, the output end of the second differentiator U1 is connected to the inverting input end of the third differentiator U3, so as to obtain a total output signal OUT according to the difference between the first superimposed signal and the second superimposed signal of the third differentiator U3, the first superimposed signal is a positive signal, the second superimposed signal is a negative signal, the positive signal subtracts the negative signal, the obtained total output signal OUT is a positive signal with an absolute value equal to the sum of the absolute value of the first superimposed signal and the absolute value of the second superimposed signal, and the total output signal OUT is equal to the sum of the output signals of the first microphone chip MIC1 to the fourth microphone chip MIC 4.
In the present embodiment, it is understood that the first to third differentiators U1 to U3 are differential amplifiers having an amplification factor of 1, and the total output signal OUT is equal to the sum of the output signals of the first to fourth microphone chips MIC1 to MIC 4.
In an alternative embodiment, at least one of the first to third differentiators U1 to U3 is a differential amplifier with an amplification factor greater than 1, and the total output signal OUT obtained correspondingly includes a gain amount of at least one of the output signals of the first to fourth microphone chips MIC1 to MIC4, and the output signal of at least one of the first to fourth microphone chips MIC1 to MIC4 is correspondingly enhanced, so as to improve the pickup effect of a part of the microphone chips MIC.
Referring to fig. 2 and 3, the structures of the connection circuit 10 and the connection circuit 20 according to the embodiment of the present invention correspond to a logic chain circuit including a plurality of two-branch nodes, the magnitude of the output signal of the trunk path of each two-branch node is proportional to the sum of the magnitudes of the input signals of the two branch paths thereof (in this embodiment, equal, corresponds to lossless superimposition logic), the branch paths of the two-branch nodes are connected to a plurality of input terminals of the connection circuit, and the output signals (audio signals) of a plurality of microphone chips are accessed through the plurality of input terminals, so that the total output signal OUT of the output signals of the plurality of microphone chips superimposed on the access is provided at the output terminal of the logic chain circuit through the lossless superimposition logic of each two-branch node.
The nodes of the logic chain circuit are two branch nodes, each two branch node is correspondingly provided with a differentiator, when the positive and negative polarities of input signals on two branch paths of the two branch nodes are the same, an inverting circuit is arranged on the input path of the non-inverting input end or the inverting input end of the differentiator, so that the amplitude of the output signal on the trunk path of the two branch nodes is the sum of the amplitudes of the input signals on the two branch paths, the output signal is a positive signal or a negative signal (the non-inverting input end of the differentiator is connected with the signal to be a negative signal, the output signal is a negative signal when the inverting input end is connected with the signal to be a positive signal, the positive and negative polarities of the input signals of the differentiator are adjusted according to the arrangement of the inverting circuit), and the output signals of a plurality of nodes can be further processed through the lossless superposition logic of the rear end so that the final total output signal OUT is a positive signal. If the total output signal OUT is a negative signal, the total output signal OUT of the negative signal may be processed into a positive signal by an inverting circuit (this processing may be directly provided with an inverting circuit in a connection circuit or an inverting processing may be performed by a back end of the system, which is not particularly limited in the present invention).
In the above embodiment, the number of the corresponding two-branch nodes is at most 2 n -1 when the number of the microphone chips is 2 n, and the number of the additional microphone chips can be directly connected to the two-branch nodes of the subsequent stage when the number of the microphone chips is odd, for example, the number of the microphone chips is 3, the second differentiator U2 is not provided, the output signal of the third microphone chip MIC3 is connected to the inverting input end of the third differentiator U2 after being inverted by the inverting circuit, so that the lossless superposition logic of the output signals of the three microphone chips can be realized, and the number of the corresponding two-branch nodes is at most 2 n -1. The number of the two branch nodes corresponds to the number of the needed differentiators.
Fig. 4 shows a schematic configuration of a connection circuit according to a third embodiment of the present invention.
Referring to fig. 4, the connection circuit 30 of the present embodiment includes a first differentiator U1, a second differentiator U2, a third differentiator U3, an inverter circuit 11, an inverter circuit 12, and an inverter circuit 13.
The output end of the first microphone chip MIC1 is connected to the non-inverting input end of the first differentiator U1, the output end of the second microphone chip MIC2 is connected to the inverting input end of the first differentiator U1 through an inverting circuit 11, a first superposition signal is provided at the output end of the first differentiator U1, and the first superposition signal is a positive signal and is equal to the sum of the output signal of the first microphone chip MIC1 and the output signal of the second microphone chip MIC 2.
The output end of the third microphone chip MIC3 is connected to the non-inverting input end of the second differentiator U2, and the output end of the fourth microphone chip MIC4 is connected to the inverting input end of the second differentiator U2 through the inverting circuit 12, and a second superimposed signal is provided at the output end of the second differentiator U2, where the second superimposed signal is a positive signal and is equal to the sum of the output signal of the third microphone chip MIC3 and the output signal of the fourth microphone chip MIC 4.
The output end of the first differentiator U1 is connected with the non-inverting input end of the third differentiator U3, the output end of the second differentiator U2 is connected to the inverting input end of the third differentiator U3 through an inverting circuit 13, and a total output signal OUT is provided at the output end of the third differentiator U3, and corresponds to the sum of the first superposition signal and the second superposition signal. Namely, the first superimposed signal and the second superimposed signal which are accessed by two branch paths of the two branch nodes corresponding to the third differentiator U3 are both positive signals, at this time, the inverting circuit 13 is arranged on the input path of the inverting input end of the third differentiator U3, and the superimposed signal of the first superimposed signal and the second superimposed signal can be obtained at the output end of the third differentiator U3.
Referring to fig. 3 and 4, compared to the connection circuit 30, the connection circuit 20 adjusts the second superimposed signal provided by the second differentiator U2 to a negative signal, so that the inverter circuit 13 of the subsequent circuit can be saved, and the cost can be reduced.
The signal amplitude loss of the first superposition signal and the second superposition signal provided by the first differentiator U1 and the second differentiator U2 is small, the rear-stage circuit can select to directly superimpose the first superposition signal and the second superposition signal in parallel through wires to obtain a total output signal, and compared with the total output signal obtained by directly connecting the output signals of a plurality of microphone chips in parallel through wires, the microphone has a certain gain effect and a certain pick-up effect.
Fig. 5 shows a schematic configuration of a connection circuit according to a fourth embodiment of the present invention. The connection circuit 40 of the fourth embodiment of the present invention has the same basic structure as the connection circuit 20 of the second embodiment, and the same parts are not described here again.
Referring to fig. 5 and 3, the connection circuit 40 according to the fourth embodiment of the present invention is further provided with a preprocessing circuit 21 on each of the input paths of the plurality of input terminals thereof, and the preprocessing circuit 21 includes, for example, a filter, an amplifier, etc. to pre-filter out noise signals or pre-amplify the input signals, reducing the need for amplification by the differentiator at the rear end.
The connecting circuit provided by the invention comprises a plurality of input ends and a logic chain circuit, wherein the logic chain circuit comprises at least one two-branch node, the two-branch node is provided with a differentiator, when the positive and negative polarities of input signals on two branch paths of the two-branch node are the same, the non-inverting input end or the inverting input end of the differentiator is provided with an inverting circuit, so that the output end of the differentiator outputs amplitude superposition signals of the input signals on the two branch paths, and the hardware circuit is used for realizing the superposition of the input signals without amplitude loss, thereby providing convenience for the lossless superposition of multiple audio signals.
The invention also provides an audio acquisition system which comprises a plurality of microphone chips and the connecting circuit, wherein the output signals of the microphone chips are overlapped and integrated into a total output signal through the connecting circuit, and when any microphone chip has stronger output, the audio acquisition system can effectively pick up sound, so that the reliability of audio acquisition is ensured.
The invention also provides voice communication equipment which comprises the audio acquisition system provided by the invention, and the voice communication equipment is provided with a plurality of microphone chips, so that sound sources in various different directions can be effectively picked up, and the voice communication quality is high.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. A connection circuit for transmission of audio signals, comprising:
The plurality of input ends are used for accessing a plurality of audio signals, and the plurality of audio signals are positive signals;
Logic chain circuitry comprising a plurality of inputs for receiving said plurality of audio signals, and an output for providing an output signal, wherein,
The logic link circuit comprises a plurality of two-branch nodes, the amplitude of the output signal on the trunk path of the two-branch nodes is proportional to the sum of the amplitudes of the input signals on the two branch paths,
The logic chain circuit comprises at least one differentiator, the differentiator is arranged at a two-branch node of the logic chain circuit, the non-inverting input end and the inverting input end of the differentiator receive input signals on two branch paths of the two-branch node, the output end provides output signals on a trunk path of the two-branch node, and
When the positive and negative of the input signals on the two branch paths of the two branch nodes corresponding to the differentiator are the same, the input path of the non-inverting input end or the inverting input end of the differentiator is also provided with an inverting circuit,
When the input ends are four, the connecting circuit comprises a first differentiator, a second differentiator, a third differentiator, a first inverting circuit and a second inverting circuit,
A first audio signal is connected to the non-inverting input terminal of the first differentiator, and a second audio signal is connected to the inverting input terminal of the first differentiator through the first inverting circuit so as to obtain a first superposition signal at the output terminal of the first differentiator;
the third audio signal is connected to the inverting input terminal of the second differentiator, the fourth audio signal is connected to the non-inverting input terminal of the second differentiator through a second inverting circuit to obtain a second superimposed signal at the output terminal of the second differentiator, the second superimposed signal being a negative signal,
The output end of the first differentiator is connected to the non-inverting input end of the third differentiator, and the output end of the second differentiator is connected to the inverting input end of the third differentiator, so as to perform difference on the first superposition signal and the second superposition signal according to the third differentiator, and obtain a total output signal.
2. The connection circuit of claim 1, wherein,
At least one of the at least one differentiator is a differential amplifier.
3. The connection circuit of claim 1, wherein,
The inverting circuit comprises at least one of a triode, an operational amplifier chip and an inverter.
4. The connection circuit of claim 1, further comprising:
And the preprocessing circuit is arranged on the access paths of the plurality of input ends.
5. The connection circuit of claim 4, wherein,
The preprocessing circuit comprises at least one of a filter and an amplifier.
6. The connection circuit of claim 1, wherein,
The at least one differentiator comprises a plurality of differentiators and is arranged at each of the plurality of branch nodes.
7. An audio acquisition system comprising:
A plurality of microphone chips;
the connection circuit of any one of claims 1 to 6, configured to integrate a plurality of output signals of the plurality of microphone chips into one audio signal output.
8. A voice communication apparatus comprising:
the audio acquisition system of claim 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102595295A (en) * | 2012-03-06 | 2012-07-18 | 歌尔声学股份有限公司 | Micro-electro-mechanical-system (MEMS) microphone |
| CN206149487U (en) * | 2017-01-22 | 2017-05-03 | 北京快鱼电子股份公司 | Sound pick up equipment |
| CN106658296A (en) * | 2017-01-22 | 2017-05-10 | 北京快鱼电子股份公司 | Pickup device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE112015001680T5 (en) * | 2014-05-01 | 2017-01-26 | Robert Bosch Gmbh | Frequency-modulated microphone system |
| US9936289B2 (en) * | 2014-11-25 | 2018-04-03 | Invensense, Inc. | Microelectromechanical systems (MEMS) microphone array with dedicated amplifiers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102595295A (en) * | 2012-03-06 | 2012-07-18 | 歌尔声学股份有限公司 | Micro-electro-mechanical-system (MEMS) microphone |
| CN206149487U (en) * | 2017-01-22 | 2017-05-03 | 北京快鱼电子股份公司 | Sound pick up equipment |
| CN106658296A (en) * | 2017-01-22 | 2017-05-10 | 北京快鱼电子股份公司 | Pickup device |
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