CN115884026A - Time sequence synchronization method for distributed microphone array to acquire acoustic information - Google Patents
Time sequence synchronization method for distributed microphone array to acquire acoustic information Download PDFInfo
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- CN115884026A CN115884026A CN202211593034.7A CN202211593034A CN115884026A CN 115884026 A CN115884026 A CN 115884026A CN 202211593034 A CN202211593034 A CN 202211593034A CN 115884026 A CN115884026 A CN 115884026A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a time sequence synchronization method for collecting acoustic information by a distributed microphone array, which comprises the following steps: establishing a wireless connection relation with a distributed microphone array; acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction, sending the data acquisition instruction to the distributed microphone array, and acquiring first space acoustic information; setting a plurality of memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics after performing audio data frame alignment processing on the first space acoustic information; the invention is based on wireless technology, and physical connection is not needed among arrays; the multi-array time sequence synchronization error designed by the invention is extremely small, and the time sequence synchronization error is not accumulated; the sampling timing synchronization is achieved without physical connection, and the sampling timing has no accumulated error.
Description
Technical Field
The invention relates to the technical field of circuit design of signal generators, in particular to a time sequence synchronization method for a distributed microphone array to acquire acoustic information.
Background
The method aims at the acquisition problem of large space acoustic information: in microphone array systems, the basic concept is that of a single array system, for example, as shown in fig. 1: the single array can only receive acoustic information in a single direction from the sound source. But the sound is emitted in all directions. In order to collect spatial acoustic information from multi-directional sources,multiple arrays are required for collection as shown in fig. 2; in this way, spatial information from a sound source can be collected by a plurality of microphone array systems. Such as time t 1 The sound source is at the position of a. Then multiple arrays can acquire acoustic information within the space for a frame. When the sound source moves, it can be at the next time t n And acquiring another frame of the acoustic information in the space. Therefore, the multi-array microphone acquisition system has application requirements.
However, the acquisition of acoustic information for large spatial arrays requires very high acquisition synchronicity. Here, it is required that acquisition synchronization errors among all microphone array components are extremely small to ensure that acoustic information frames of large-space acoustic information are at the same time. The distributed microphone array system is used for solving the problem of acquiring large-space acoustic information. If the sampling time sequence synchronization is performed between the arrays in a wiring mode, the distance between the arrays is long and difficult to realize, so that a time sequence synchronization method for collecting the acoustic information by the distributed microphone array is urgently needed, and the technical problem of the existing distributed microphone array in the space acoustic information collection process is solved.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a timing synchronization method for a distributed microphone array to acquire acoustic information, so as to achieve synchronization and correction of sampling timing without physical connection in the distributed microphone array.
In order to achieve the technical object, the present application provides a timing synchronization method for a distributed microphone array to acquire acoustic information, including the following steps:
establishing a wireless connection relation with a distributed microphone array;
acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction, sending the data acquisition instruction to the distributed microphone array, and acquiring first space acoustic information;
and setting a plurality of memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics after performing audio data frame alignment processing on the first space acoustic information.
Preferably, in the process of establishing a wireless connection relationship with the distributed microphone array, the high-frequency voltage-controlled crystal oscillator is arranged in a slave control device establishing a wireless connection relationship with the distributed microphone array, and is used for generating the synchronization instruction through time sequence counting output by the high-frequency voltage-controlled crystal oscillator
Preferably, in the process of generating the synchronous instruction, starting the high-frequency voltage-controlled crystal oscillator and outputting a high-frequency time sequence; and acquiring a synchronous sampling time sequence according to the high-frequency time sequence to form a synchronous instruction.
Preferably, in the process of output waveform correction, after the slave control device receives the synchronization instruction, the synchronization instruction is interrupted, and after the high-frequency voltage-controlled crystal oscillator is controlled to reset and re-output the sinusoidal waveform, the synchronization instruction is continuously executed, so that the accumulated error of the crystal oscillator is re-corrected, and the crystal oscillator output waveforms of all the slave control devices are re-corrected.
Preferably, the output waveforms are periodically aligned for correction during the correction of the output waveforms so that the timing of the acquisition will not produce cumulative errors.
Preferably, after the process of acquiring the first spatial acoustic information, the slave control device sends the first spatial acoustic information to the memory buffer of the master control device in a wireless transmission manner.
Preferably, in the process of performing frame alignment processing on the audio data of the first spatial acoustic information, after the buffer is full, performing frame ID numbering on the data in the buffer, inserting a data packet header, and sending the data packet header to a data summarization processing environment of the main control device;
the data summarization processing environment receives N frames of N slave control devices, acquires and marks ID numbers of the N frames, judges that the maximum number in the N frames is marked as fmax, discards all frames smaller than fmax, and re-reads the next frame of the slave control device until the frame number is equal to fmax until the ID numbers of all the slave control devices are fmax.
Preferably, the timing synchronization system for implementing the timing synchronization method includes:
the communication module is used for establishing a wireless connection relation with the distributed microphone array;
the data acquisition module is used for acquiring first space acoustic information by acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction and sending the data acquisition instruction to the distributed microphone array;
and the synchronous alignment module is used for performing audio data frame alignment processing on the first space acoustic information by setting a plurality of memory buffer areas with the same length to obtain second space acoustic information with the same time sequence characteristics.
Preferably, the removable storage device for carrying the timing synchronization system comprises:
the master control device is used for bearing the module functions of the synchronous alignment module, establishing a wireless connection relation with the slave control device, acquiring first space acoustic information by sending a synchronous instruction, performing audio data frame alignment processing on the first space acoustic information according to a plurality of set memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics
And the slave control device is used for establishing wireless connection with the central control device and the distributed microphone array respectively, acquiring a synchronization instruction sent by the master control device, outputting waveform correction, generating a data acquisition instruction and sending the data acquisition instruction to the distributed microphone array to acquire first space acoustic information.
Preferably, the timing synchronization method is implemented by a computer program, and the computer program is embedded in a control unit for controlling the distributed microphone array, so that the control unit implements the timing synchronization method to obtain spatial acoustic information with the same timing characteristics.
The invention discloses the following technical effects:
the invention is based on wireless technology, and the arrays do not need physical connection; the timing sequence synchronization error among the multiple arrays designed by the invention is extremely small, and the timing sequence synchronization error is not accumulated; the sampling timing synchronization is achieved without physical connection, and the sampling timing has no accumulated error.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 creative efforts.
FIG. 1 is a schematic diagram of a microphone array according to the background of the invention;
FIG. 2 is a schematic diagram of a distributed microphone array according to the background of the invention;
FIG. 3 is a functional design diagram for implementing a method for acquiring spatial acoustic information according to an embodiment of the present invention;
fig. 4 is a schematic hardware logic diagram of a spatial acoustic information acquisition method according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-5, the present invention provides a timing synchronization method for a distributed microphone array to acquire acoustic information, comprising the following steps:
establishing a wireless connection relation with a distributed microphone array;
acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction, and sending the data acquisition instruction to the distributed microphone array to acquire first space acoustic information;
and setting a plurality of memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics after performing audio data frame alignment processing on the first space acoustic information.
Further preferably, in the process of establishing a wireless connection relationship with the distributed microphone array, the high-frequency voltage-controlled crystal oscillator is arranged in the slave control device establishing a wireless connection relationship with the distributed microphone array, and is used for generating the synchronization instruction through the time sequence counting output by the high-frequency voltage-controlled crystal oscillator
Further preferably, in the process of generating the synchronous instruction, the invention outputs a high-frequency time sequence by starting the high-frequency voltage-controlled crystal oscillator; and acquiring a synchronous sampling time sequence according to the high-frequency time sequence to form a synchronous instruction.
Further preferably, in the output waveform correction process, after the slave control device receives the synchronization instruction, the synchronization instruction is interrupted first, the high-frequency voltage-controlled crystal oscillator is controlled to reset to output the sine waveform again, and then the synchronization instruction is continuously executed to re-correct the accumulated error of the crystal oscillator so that the crystal oscillator output waveforms of all the slave control devices are re-corrected.
Further preferably, the present invention performs periodic correction alignment on the output waveform during the output waveform correction process, so that the timing of the acquisition will not generate accumulated errors.
Further preferably, after the process of acquiring the first spatial acoustic information, the first spatial acoustic information is sent to the memory buffer of the master control device by the slave control device in a wireless transmission manner.
Further preferably, in the process of performing frame alignment processing on the audio data of the first spatial acoustic information, when the buffer area is full, the invention performs frame ID numbering on the data in the buffer area, inserts a data packet header, and sends the data packet header to a data summarization processing environment of the main control device;
the data summarization processing environment receives N frames of N slave control devices, acquires and marks the ID numbers of the N frames, judges that the maximum number in the N frames is marked as fmax, discards all frames smaller than fmax, and re-reads the next frame of the slave control device until the frame number is equal to fmax until the ID numbers of all the slave control devices are fmax.
Further preferably, the present invention further provides a timing synchronization system for implementing the timing synchronization method, including:
the communication module is used for establishing a wireless connection relation with the distributed microphone array;
the data acquisition module is used for acquiring first space acoustic information by acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction and sending the data acquisition instruction to the distributed microphone array;
and the synchronous alignment module is used for performing audio data frame alignment processing on the first space acoustic information by setting a plurality of memory buffer areas with the same length to obtain second space acoustic information with the same time sequence characteristics.
Further preferably, the present invention also provides a removable storage device for carrying the timing synchronization system, comprising:
the master control device is used for bearing the module functions of the synchronous alignment module, establishing a wireless connection relation with the slave control device, acquiring first space acoustic information by sending a synchronous instruction, performing audio data frame alignment processing on the first space acoustic information according to a plurality of set memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics
And the slave control device is used for establishing a wireless connection relation with the central control device and the distributed microphone array respectively, acquiring a synchronization instruction sent by the master control device, correcting an output waveform, generating a data acquisition instruction and sending the data acquisition instruction to the distributed microphone array to acquire first space acoustic information.
Further preferably, the present invention further designs a computer, which implements a timing synchronization method through a computer program, and embeds the computer program into a control unit for controlling the distributed microphone array, so as to enable the control unit to implement the timing synchronization method, and obtain spatial acoustic information with the same timing characteristics.
In order to solve the problem that the sampling time sequence of the distributed microphone array is not synchronous, the wireless acquisition and synchronization mode is adopted to realize the mode of no wiring and network among the arrays, and the audio acquisition among the arrays can be ensured to be synchronous without accumulated errors.
A distributed microphone array system is composed of a plurality of independent microphone arrays. In order to ensure the synchronism of the audio collected by the multiple microphone systems, a timing synchronization line is often connected between two independent microphone arrays. This results in increased wiring and implementation complexity and reduced reliability for multi-array systems. If the wired timing synchronization line is not used for acquisition timing synchronization. Although the oscillation frequency of the crystal oscillator is consistent due to the crystal oscillators used in different arrays, due to the problem of the crystal oscillator production process, a small error (ppm usually the crystal oscillator has this parameter to explain the error of this crystal oscillator) must exist, so that after a long time of operation, an unacceptable time difference occurs in the sampling timing sequence between the arrays, and for the array system, the asynchronous sampling of this timing sequence causes a serious algorithm problem. In a multi-array microphone system, in order to ensure the synchronism of sampling time sequences, wired physical connection is required to be used for synchronizing the sampling time sequences, and if wired physical connection is not adopted, an effective method for synchronizing and correcting the accumulated error problem of a non-homologous crystal oscillator is not provided in the market at present. Or the correction of synchronous sampling error can only be controlled within the accuracy of ms (millisecond) order (the accuracy is usually only 10 milliseconds at most), and cannot be controlled within the acceptable range of the array audio algorithm. The synchronization processing method provided by the invention is a method for realizing synchronization and correction of sampling time sequence in the distributed microphone array without physical connection.
The scheme for synchronously aligning the audio data frames provided by the invention comprises the following two steps:
step 1, a timing synchronization and correction method:
step 1.1, all slave devices enter a waiting state after being started, and wait for a master device to send a starting acquisition command;
step 1.2, the main equipment controls the wireless communication device to send a collection starting command;
step 1.3, N slave devices receive a broadcast command at the same time, and trigger the MCU to start acquisition interruption;
step 1.4, simultaneously initializing DDS chips by N slave unit MCUs, and simultaneously starting a voltage-controlled crystal oscillator and outputting a high-frequency time sequence;
step 1.5, outputting a synchronous sampling time sequence because the DDS chip counts according to the time sequence output by the voltage-controlled crystal oscillator;
step 1.6, the master control equipment triggers the wireless communication device to broadcast and send a timing synchronization command at regular time;
step 1.7, the slave control equipment receives a synchronous command and triggers the slave control equipment to interrupt and enter synchronous command processing operation;
and step 1.8, triggering voltage-controlled crystal oscillator reset by the slave control equipment to output sine waveforms again, wherein the operation corrects the accumulated errors of the crystal oscillator again to enable the crystal oscillator output waveforms of all the equipment to be corrected again. The step resets the reference time sequence of the DDS chip to a synchronous state, so that the data acquisition time sequence of the DDS chip has no deviation;
and step 1.9, periodically correcting and aligning the output waveform of the voltage-controlled crystal oscillator, wherein the acquired time sequence does not generate accumulated errors.
Step 2, the audio data frame alignment method:
and 2.1, acquiring audio by the mcu according to the corrected sampling time sequence.
And 2.2, all the mcus use memory buffers with the same length to receive data.
And 2.3, when the buffer area is full, carrying out frame ID numbering on the data in the buffer area, inserting a data packet head, and sending the data to a data summarization processing environment.
Step 2.4, the data summarization processing environment receives N frames of N devices, obtains the serial numbers of the N frames, and marks the serial numbers as f 1 ,f 2 ,f 3 ,……，f n .
Step 2.5, the data processing environment judges that the maximum number mark in the N frames is f max . Discard all sub-f max And re-reading the next frame of the device until the frame number equals f max .
And 2.6, when the frame IDs of all the devices are the same, the data in all the frames can be acquired in the same time period.
The synchronization scheme provided by the invention realizes that the time sequence synchronization error between the arrays is within 500 nanoseconds (= 0.0005 milliseconds) under the condition of no physical connection between the arrays, and even can reach the time sequence synchronization error of 20 nanoseconds theoretically without accumulation. Then timing synchronization errors within 500 nanoseconds are almost negligible for multi-array audio processing algorithms.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A time sequence synchronization method for a distributed microphone array to collect acoustic information is characterized by comprising the following steps:
establishing a wireless connection relation with the distributed microphone array;
acquiring a synchronization instruction, correcting an output waveform, generating a data acquisition instruction, sending the data acquisition instruction to the distributed microphone array, and acquiring first space acoustic information;
and setting a plurality of memory buffer areas with the same length, and acquiring second space acoustic information with the same time sequence characteristics after performing audio data frame alignment processing on the first space acoustic information.
2. The timing synchronization method for a distributed microphone array to acquire acoustic information as claimed in claim 1, wherein:
in the process of establishing a wireless connection relation with the distributed microphone array, the high-frequency voltage-controlled crystal oscillator is arranged in the slave control equipment which establishes the wireless connection relation with the distributed microphone array and is used for generating the synchronization instruction through the time sequence counting output by the high-frequency voltage-controlled crystal oscillator.
3. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 2, wherein:
in the process of generating a synchronous instruction, starting the high-frequency voltage-controlled crystal oscillator and outputting a high-frequency time sequence; and acquiring a synchronous sampling time sequence according to the high-frequency time sequence to form the synchronous instruction.
4. The timing synchronization method for the distributed microphone array to acquire the acoustic information as claimed in claim 3, wherein:
in the process of output waveform correction, after the slave control device receives the synchronization instruction, the synchronization instruction is interrupted, the high-frequency voltage-controlled crystal oscillator is controlled to reset and output sinusoidal waveforms again, and then the synchronization instruction is continuously executed, so that the accumulated errors of the crystal oscillator are corrected again, and the crystal oscillator output waveforms of all the slave control devices are corrected again.
5. The timing synchronization method for the distributed microphone array to acquire the acoustic information as claimed in claim 4, wherein:
and in the process of correcting the output waveform, periodically correcting and aligning the output waveform, so that the acquired time sequence does not generate accumulated errors.
6. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 5, wherein:
after the process of acquiring the first spatial acoustic information, the slave control device sends the first spatial acoustic information to the memory buffer area of the master control device in a wireless transmission manner.
7. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 6, wherein:
in the process of carrying out audio data frame alignment processing on the first space acoustic information, after a buffer area is full, carrying out frame ID numbering on data in the buffer area, inserting a data packet header, and sending the data packet header to a data summarizing processing environment of the main control equipment;
the data summarization processing environment receives N frames of N slave control devices, acquires and marks ID numbers of the N frames, and judges that the maximum number in the N frames is marked as f max Discard all sub-f max After the frame of (c), re-reading the next frame of the slave device until the frame number equals to f max Until all slave devices have ID numbers f max Until now.
8. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 7, wherein:
a timing synchronization system for implementing a timing synchronization method, comprising:
the communication module is used for establishing a wireless connection relation with the distributed microphone array;
the data acquisition module is used for acquiring the first space acoustic information by acquiring the synchronous instruction, correcting the output waveform, generating a data acquisition instruction and transmitting the data acquisition instruction to the distributed microphone array;
and the synchronous alignment module is used for performing audio data frame alignment processing on the first space acoustic information by setting a plurality of memory buffer areas with the same length to obtain second space acoustic information with the same time sequence characteristics.
9. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 8, wherein:
a removable memory device for carrying the timing synchronization system, comprising:
the master control device is used for bearing the module functions of the synchronous alignment module, establishing a wireless connection relation with the slave control device, acquiring the first space acoustic information by sending the synchronous instruction, aligning the audio data frames of the first space acoustic information according to a plurality of set memory buffer areas with the same length, and acquiring the second space acoustic information with the same time sequence characteristics
The slave control device is used for establishing wireless connection with the central control device and the distributed microphone array respectively, acquiring the synchronous instruction sent by the master control device, outputting waveform correction, generating a data acquisition instruction and sending the data acquisition instruction to the distributed microphone array to acquire first space acoustic information.
10. The timing synchronization method for the distributed microphone array to collect the acoustic information as claimed in claim 9, wherein:
the time sequence synchronization method is realized through a computer program, and the computer program is embedded into a control unit for controlling the distributed microphone array, so that the control unit realizes the time sequence synchronization method and obtains the space acoustic information with the same time sequence characteristics.
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