CN111432034A - Intelligent distributed audio control system and audio signal processing method - Google Patents
Intelligent distributed audio control system and audio signal processing method Download PDFInfo
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Abstract
The invention discloses an intelligent distributed audio control system and an audio signal processing method, wherein the control system comprises a root audio node and a plurality of branch audio nodes, each audio node in the root audio node and the branch audio nodes comprises a network layer, and the network layer is used for transmitting an audio signal of the node to a signal link and/or obtaining the audio signal from the signal link; the audio node also comprises at least one of a processor and an audio peripheral, different audio nodes in the same audio control system have the same or different composition structures, different audio nodes in the same audio control system can bidirectionally transmit audio signals through a network layer, and at least one branch audio node in the same audio control system is provided with the processor and the network layer. The invention realizes the signal transmission optimization of each audio node, and is convenient for algorithm transplantation development or development and compatibility of various algorithms.
Description
Technical Field
The invention relates to the field of audio systems, in particular to an intelligent distributed audio control system and an audio signal processing method.
Background
With the popularization of automobile products and the vigorous development of a new round of science and technology and industrial revolution, electromotion, intellectualization, networking and sharing become the future development trend of the automobile industry. These trends will bring about great changes in human life and travel, and will also lead to changes in car cabin form, cabin function, and interaction mode, so the design of car intelligent cabin will become the key factor of future car development and innovation.
In the development of an intelligent cabin of an automobile, various technologies related to the quality of sound in the automobile, such as active noise reduction in the automobile, active sound field management, regional sound field control and the like, aiming at improving the comfort level and the experience feeling of the cabin, are continuously developed, and the development of the technologies brings a severe test for a traditional audio system.
Conventional audio control systems are generally composed of an electroacoustic transducer (microphone), an analog-to-digital converter (ADC), an audio data processing module (DSP, FPGA, MCU, etc.), a digital-to-analog converter (DAC), a Power Amplifier (PA), and an electroacoustic transducer (speaker). The audio data processing module can receive audio sources in other protocol forms besides digital signals generated by the analog-to-digital converter. In essence, a conventional audio control system is a process of transmitting one or more audio sources to an audio controller via an audio transmission protocol, and the controller processes audio and then transmits the processed audio to a speaker, so the conventional audio system is an audio architecture that is audio signal-intensive and computation-intensive.
In order to comply with the large trend of intellectualization and reduce the complexity of an audio system, more and more intelligent cabin models deploy a car audio network. In a conventional audio network, audio streams are typically transmitted from each node to a host controller and a host audio chip. Each node provides a raw audio stream signal or a sensor signal. The main controller carries out calculation according to a corresponding algorithm, and at the initial stage of algorithm development, a main controller manufacturer needs to cooperate with an algorithm manufacturer to evaluate the resource overhead, system requirements and the like of the algorithm, and needs to jointly develop the main controller manufacturer and the algorithm manufacturer, so that the development period is long, and the efficiency is low. And when the system needs to increase the number of sensors, upgrade the algorithm, or add a new algorithm, especially when the memory overhead rises above the initial design value, the hardware upgrade is difficult and cannot be performed. In addition, the control algorithm is different day by day, and the hardware architecture of the traditional integrated audio system is determined in the initial development, so that the hardware architecture cannot be increased conveniently, the reference signal is reduced, and the system is difficult to upgrade.
At present, when a single complex algorithm is transplanted in the traditional audio, the algorithm can still be developed and transplanted in a mode of increasing the computing power of a chip. However, when a plurality of complex algorithms need to be migrated, due to the limitation of operating resources, different algorithm suppliers mutually engage in an elbow, and it is difficult to fully exert the advantages of the respective algorithms. Although a processor with a multi-core architecture exists in a traditional audio processing system, access synchronization and multi-core communication are required to be controlled in parallel, development is difficult generally, and with the increase of the number of reference signals, the processor generally needs to adopt a special chip with multiple cores and a large memory, the chip is expensive on one hand, and has few selectable models on the other hand, an algorithm manufacturer has to develop the chip based on unified chips in a re-cooperation mode, and development period and difficulty are greatly increased.
Disclosure of Invention
In order to overcome the defects in the prior art, in view of the limitation of the current automobile audio network, the invention provides an intelligent distributed audio control system and an audio signal processing method aiming at the problems of transplantation and upgrading of an automobile audio complex algorithm, and the like, and the technical scheme is as follows:
in one aspect, the present invention provides an intelligent distributed audio control system, comprising a root audio node and a plurality of branch audio nodes, wherein each of the root audio node and the branch audio nodes comprises a network layer, and the network layer is used for transmitting an audio signal of the node out to a signal link and/or obtaining the audio signal from the signal link;
the audio node further comprises at least one of a processor and an audio peripheral, wherein the audio peripheral is used for acquiring an audio signal outside the audio control system and/or transmitting the audio signal to the outside of the audio control system, the processor is used for receiving a signal provided by a network layer or the audio peripheral for calculation processing, and transmitting a calculation processing result to an audio network through the network layer or outputting the calculation processing result to the outside of the audio control system through the audio peripheral;
different audio nodes in the same audio control system have the same or different composition structures, different audio nodes in the same audio control system can bidirectionally transmit audio signals through a network layer, and at least one branch audio node in the same audio control system is provided with a processor and the network layer.
Further, two or more audio nodes in the same audio control system have processors.
Further, processors of different audio nodes run different audio function algorithms.
Further, the processors in the plurality of audio nodes can cooperate to perform a combining operation, including: and the processor of one audio node transmits the calculation processing result as an intermediate result of the algorithm to the processor of the other audio node in a signal link, and the processor of the other audio node continues the calculation processing, wherein the combination operation processing at least comprises two audio function algorithms.
Further, the system is connected through an audio network bus, and each audio node is connected with only the adjacent audio nodes on the physical link of the system.
Further, the processors in the single audio node can independently complete the arithmetic processing of the signal.
Furthermore, a plurality of audio nodes in the same audio control system are provided with audio peripherals, and the audio nodes provided with the audio peripherals are distributed in different areas.
Further, the audio peripheral comprises a sensor, an analog-to-digital converter, a digital-to-analog converter, a power amplifier and a driver, wherein the sensor comprises any one or more of an acoustic sensor, a displacement sensor, a force sensor, an acceleration sensor and a deformation sensor, and the driver comprises any one or more of a loudspeaker, a motor and a piezoelectric stack.
In another aspect, the present invention provides an audio signal processing method based on the above intelligent distributed audio control system, for processing an audio function algorithm, wherein the method includes the following steps:
s1, determining the audio node where the processor responsible for running the audio function algorithm is located, and determining one or more audio nodes for acquiring the required reference signal;
s2, the audio nodes for acquiring the required reference signals acquire the reference signals through respective audio peripherals respectively;
s3, the audio node where the processor responsible for running the audio function algorithm is located acquires the reference signal in the step S2 through a network layer;
and S4, the processor performs calculation processing on the reference signal and sends the calculation processing result to an audio node needing to utilize the calculation processing result through a network layer.
Further, based on the intelligent distributed audio control system, the processing steps S1-S4 of different audio function algorithms are executed in parallel;
step S4 includes: sending the calculation processing result as an intermediate result of the corresponding audio function algorithm to a processor of another audio node through a network layer;
step S4 is followed by:
and S5, the processor of the other audio node performs calculation processing on the intermediate results received by the different audio function algorithms, or the processor of the other audio node receives the intermediate results and acquires the reference signals required by the calculation of the intermediate results to perform calculation processing.
The technical scheme provided by the invention has the following beneficial effects:
conventional audio systems integrate signals and operations onto a block of processors, and there is considerable redundancy of memory access. When a plurality of algorithms which need to be migrated exist, according to the signal principle, the algorithm input and output at each moment only need the signal of the last audio clock, that is, in the migration of multiple algorithms, only the output signal of each algorithm needs to be obtained in the network. In addition to having access to the final outputs of multiple algorithms, which run in the same block processor in conventional audio systems, the intermediate values of each algorithm step can also be accessed from one another, and such access is usually unnecessary, resulting in redundancy of memory access. And the calculation of a plurality of algorithms in the same controller has the problems of resource access conflict, signal synchronization and the like. The distributed audio system is an inherent parallel mechanism due to the existence of a plurality of operation nodes, and signals of any node can be freely obtained in an audio network, and resources are usually not conflicted with each other. In a distributed audio system, the outputs of the individual controllers are synchronized by the audio network, so there is substantially no signal synchronization problem. In addition, the distributed system can flexibly select the controllers according to the algorithm and the number of the reference signals, and the controllers can be satisfied by common chips for a single algorithm, so that the unit price is low.
In the distributed audio system, each operation unit can run different algorithms, algorithm results can be directly transmitted in a system network, integration to a main operation is not needed, and the bandwidth occupation of a signal link is reduced. And each algorithm company can independently develop own algorithm, flexibly increase and decrease reference signals, and develop modules with different resource consumption according to different product positioning. The method is beneficial to expanding the accurate control system cost of the algorithm company, perfecting product coverage, and providing convenience for later-stage upgrading and maintenance because each node is an independent module, and especially when the upgrade iteration of the algorithm is limited by hardware, the module can be directly replaced.
(1) And signal transmission optimization of each audio node is realized through a high-speed audio protocol bus and an operation node which are transmitted in a bidirectional way.
(2) The distributed audio control system is adopted to decouple the intelligent sound field control algorithm, so that the algorithm transplantation development or the development and compatibility of various algorithms are facilitated.
(3) The method can realize the accurate transplantation of the scheme and the accurate control of the development cost, and can facilitate the subsequent services such as upgrading service, maintenance and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without creative efforts.
Fig. 1 is a diagram of an audio node structure of an intelligent distributed audio control system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an intelligent distributed audio control system provided by an embodiment of the invention;
FIG. 3 is a prior art conventional audio network node distribution diagram;
fig. 4 is a flowchart of an audio signal processing method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood and more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present invention will be described below in detail and completely with reference to the accompanying drawings. It should be noted that the implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all 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. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment of the invention, an intelligent distributed audio control system is provided, which comprises a plurality of audio nodes, wherein the structure of the audio nodes is shown in fig. 1, the audio nodes comprise a network layer, and the network layer is used for transmitting audio signals of the nodes out to a signal link and/or obtaining the audio signals from the signal link; the audio node further comprises at least one of a processor and an audio peripheral, wherein the audio peripheral is used for acquiring an audio signal outside the audio control system and/or transmitting the audio signal to the outside of the audio control system, the processor is used for receiving a signal provided by a network layer or the audio peripheral for calculation processing, and transmitting a calculation processing result to an audio network through the network layer or outputting the calculation processing result to the outside of the audio control system through the audio peripheral; the audio peripheral comprises a sensor, an analog-to-digital converter, a digital-to-analog converter, a power amplifier and a driver, wherein the sensor is used for converting physical quantities in various forms into electric signals, and comprises any one or more of a sound sensor, a displacement sensor, a force sensor, an acceleration sensor and a deformation sensor, specifically comprises a microphone, an accelerometer, a strain gauge, a piezoelectric plate and the like; the driver is an electric driver and comprises any one or more of a loudspeaker, a motor and a piezoelectric stack; different audio nodes in the same audio control system can transmit audio signals in two directions through a network layer.
In an embodiment of the present invention, the system is connected through an audio network bus, and on a physical link of the system, each audio node is only connected with an adjacent audio node, which is different from the traditional audio network node arrangement manner in fig. 3, generally, in the audio network, the audio node No. 1 is a root node, and is integrated with multiple functions, in the traditional audio network, only one audio node has a processing function, that is, a processor is disposed in the audio node No. 1, and if the integration level of the root node is high, the maintenance difficulty is large. And the single module is relatively small in replacement and maintenance difficulty. In the present application, a plurality of audio nodes with processors are preferably provided, such an audio network well overcomes the defects of the conventional audio network, and especially when the upgrade iteration of the algorithm is limited by hardware, the module can be directly replaced, taking an audio network with 5 audio nodes as an example (the number of audio nodes in an actual audio network may be far more than 5), see fig. 2: the audio node 1 is a root audio node, the audio node 1 is assumed to include audio peripherals, a processor and a network layer, the audio nodes 2, 3, 4 and 5 are branch audio nodes, the audio nodes 2, 3 and 5 are assumed to include audio peripherals and network layers and are distributed in different areas, and the audio node 4 is assumed to include a processor and a network layer, in another embodiment, the audio node 1 may not have a processor, or the processor of the audio node 1 may be moved to other branch audio nodes such as the audio node 5.
The audio nodes 2 and 3 are distributed in different areas and respectively receive external audio reference signals through audio peripherals, and the network layer transmits the reference signals acquired by the audio nodes to an audio network;
the audio node 4 obtains the audio signal from the signal link through the network layer, the processor processes and calculates the audio signal, and then the network layer transmits the signal processing result to the audio network;
the audio node 5 may directly obtain the signal processing result in the signal link through the network layer, and then output the signal processing result to the outside of the audio control system through its audio peripheral.
The audio node 1 may also obtain a signal processing result in the signal link through the network layer, and respectively transmit the processing result to an audio node that needs audio output or directly transmit the processing result to the outside of the audio control system. The cooperative working process between the audio nodes is described in detail in the following embodiments.
Further, the processor of the audio node 1 may transmit the audio node 4 to the signal processing result in the audio network for secondary processing, and transmit the secondary processing result to the audio node requiring audio output through the audio network or directly transmit the secondary processing result to the outside of the audio control system.
In an embodiment of the present invention, the audio node 6 further includes a branch audio node 6, the audio node 6 includes a processor and a network layer, the audio node 6 can perform secondary processing on the processing result from the audio node 4 and/or the external audio signal collected by the audio node 5 through its network layer, and transmit the processed result to the audio network, and the other audio nodes can obtain the result from the audio network to output or perform signal processing calculation again. The audio function algorithm modules of the processors of the audio nodes 1, 4 and 6 are different from each other, and can independently complete the operation processing of a signal.
In another embodiment of the present invention, there is provided an audio signal processing method for processing an audio function algorithm, see fig. 4, comprising the steps of:
s1, determining the audio node where the processor responsible for running the audio function algorithm is located, and determining one or more audio nodes for acquiring the required reference signal;
s2, the audio nodes for acquiring the required reference signals acquire the reference signals through respective audio peripherals respectively;
s3, the audio node where the processor responsible for running the audio function algorithm is located acquires the reference signal in the step S2 through a network layer;
and S4, the processor performs calculation processing on the reference signal and sends the calculation processing result to an audio node needing to utilize the calculation processing result through a network layer.
In view of cost, the processors of the audio nodes in the same audio network are used for processing different audio function algorithms, in other words, the processors for processing the N audio function algorithms are preferably arranged instead of the N +1 processors, so that the problem that two or more processors are repeated to process the same audio function algorithm is avoided, and the cost can be effectively reduced.
When determining at which audio node the audio function algorithm to be processed, i.e. the processor responsible for running the audio function algorithm should be able to determine, and at the same time, determining at which audio node or nodes the input quantity of the audio function algorithm, i.e. the reference signal, and then determining from which audio node or nodes the one or more reference signals are obtained, taking the audio network in fig. 2 as an example, for example, now determining that the processor of the audio node 4 corresponds to processing the audio function algorithm, the required input reference signals are two, wherein the first reference signal is from the location of the node 2 in the audio network, and the second reference signal is from the location of the audio node 3, then the audio nodes 2, 3 respectively receive the first and second reference signals outside the audio network through the audio peripheral, and the audio nodes 2, 3 transmit the two reference signals to the audio node 4 through the network layer, the signal is processed by a processor in the audio node 4 and the result of the computational processing is sent to the audio node that needs to use the result of the computational processing through the network layer. It can be understood that for a complex audio network, the number of audio nodes is huge, there may be a plurality of audio function algorithms processed at the same time, and the processing steps S1-S4 of different audio function algorithms run in parallel;
step S4 further includes: sending the calculation processing result as an intermediate result of the corresponding audio function algorithm to a processor of another audio node through a network layer;
step S4 is followed by:
and S5, the processor of the other audio node performs calculation processing on the intermediate results received by the different audio function algorithms, or the processor of the other audio node receives the intermediate results and acquires the reference signals required by the calculation of the intermediate results to perform calculation processing.
Specifically, for example, the audio node 4 ' and a processor in the audio node 4 perform parallel processing, the processor of the audio node 4 obtains a first processing result, the processor of the audio node 4 ' obtains a second processing result, the first processing result and the second processing result are used as input reference signals of a third audio function algorithm, the third audio function signal is assumed to be processed by a processor in the audio node 6 (not shown), the audio node 4 sends the first processing result to the audio node 6 as an algorithm intermediate result, and the audio node 4 ' sends the second processing result to the audio node 6 as an algorithm intermediate result, and then the second processing result is processed by the processor of the audio node 6.
In an embodiment of the present invention, for example, the third audio function algorithm needs the first processing result obtained by the processor of the audio node 4 and the local audio signal of the audio node 4 ' (or the external audio signal of the location of the audio node 4 ' obtained through an audio peripheral device) as reference signals, the audio node 4 sends the first processing result as an algorithm intermediate result to the audio node 6, and the audio node 4 ' sends the local audio signal (or the external audio signal) to the audio node 6, and then the local audio signal (or the external audio signal) is processed by the processor of the audio node 6.
The invention provides an intelligent distributed audio control system and an audio signal processing method, which are formed by nodes of a distributed system, wherein the positions of the nodes are relatively equal, and each node can be provided with an audio peripheral and a processor, which is different from a traditional architecture of a resource concentration type. Due to the intervention of the audio node containing the processor, the audio signal can be freely combined and operated firstly, and then the operated audio signal is transmitted in a signal link instead of the original signal, so that the signal complexity of the system is greatly reduced; when some audio reference signals are only matched with a certain algorithm module for use, the distributed audio system can transmit the output result in the network, so that the mode of simultaneously transmitting a plurality of audio references back to the main processor for unified calculation in the prior art is replaced, and the bandwidth occupation of a signal link is reduced; under the condition that a plurality of algorithms need to be executed, in a traditional audio network, calculation is integrated towards a root audio node, while in a distributed system, the algorithms can be distributed to other audio nodes with operation functions, and each operation node can be responsible for an independent algorithm, so that algorithm decoupling is facilitated; in addition, when the number of nodes having the operation and configuration functions in the distributed system is 1, the distributed audio control system is degraded to a conventional audio network system, so that the distributed audio control system can also be compatible with a conventional audio network.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An intelligent distributed audio control system comprising a root audio node and a plurality of branch audio nodes, each of the root audio node and branch audio nodes comprising a network layer for transmitting audio signals of the nodes out to and/or from signal links;
the audio node further comprises at least one of a processor and an audio peripheral, wherein the audio peripheral is used for acquiring an audio signal outside the audio control system and/or transmitting the audio signal to the outside of the audio control system, the processor is used for receiving a signal provided by a network layer or the audio peripheral for calculation processing, and transmitting a calculation processing result to an audio network through the network layer or outputting the calculation processing result to the outside of the audio control system through the audio peripheral;
different audio nodes in the same audio control system have the same or different composition structures, different audio nodes in the same audio control system can bidirectionally transmit audio signals through a network layer, and at least one branch audio node in the same audio control system is provided with a processor and the network layer.
2. The intelligent distributed audio control system of claim 1, wherein two or more audio nodes in the same audio control system have processors.
3. The intelligent distributed audio control system of claim 2, wherein processors of different audio nodes run different audio function algorithms.
4. The intelligent distributed audio control system of claim 3, wherein the processors in the plurality of audio nodes are capable of performing a combined operation in cooperation, comprising: and the processor of one audio node transmits the calculation processing result as an intermediate result of the algorithm to the processor of the other audio node in a signal link, and the processor of the other audio node continues the calculation processing, wherein the combination operation processing at least comprises two audio function algorithms.
5. The intelligent distributed audio control system of claim 1, wherein the system is connected via an audio network bus, and each audio node is connected to only adjacent audio nodes on a physical link of the system.
6. The intelligent distributed audio control system of claim 1, wherein the processors in the individual audio nodes are capable of independently performing a single arithmetic processing of the signal.
7. The intelligent distributed audio control system of claim 1, wherein multiple audio nodes in the same audio control system have audio peripherals, and the audio nodes with audio peripherals are distributed in different regions.
8. The intelligent distributed audio control system of claim 7, wherein the audio peripherals comprise sensors, analog-to-digital converters, digital-to-analog converters, power amplifiers, and drivers, wherein the sensors comprise any one or more of acoustic sensors, displacement sensors, force sensors, acceleration sensors, and deformation sensors, and wherein the drivers comprise any one or more of speakers, motors, and piezoelectric stacks.
9. An audio signal processing method based on the intelligent distributed audio control system according to any one of claims 1-8, wherein the audio signal processing method is used for processing an audio function algorithm, and comprises the following steps:
s1, determining the audio node where the processor responsible for running the audio function algorithm is located, and determining one or more audio nodes for acquiring the required reference signal;
s2, the audio nodes for acquiring the required reference signals acquire the reference signals through respective audio peripherals respectively;
s3, the audio node where the processor responsible for running the audio function algorithm is located acquires the reference signal in the step S2 through a network layer;
and S4, the processor performs calculation processing on the reference signal and sends the calculation processing result to an audio node needing to utilize the calculation processing result through a network layer.
10. The audio signal processing method according to claim 9, wherein based on the intelligent distributed audio control system of claim 4, the processing steps S1-S4 of different audio function algorithms are run in parallel;
step S4 includes: sending the calculation processing result as an intermediate result of the corresponding audio function algorithm to a processor of another audio node through a network layer;
step S4 is followed by:
and S5, the processor of the other audio node performs calculation processing on the intermediate results received by the different audio function algorithms, or the processor of the other audio node receives the intermediate results and acquires the reference signals required by the calculation of the intermediate results to perform calculation processing.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114281297A (en) * | 2021-12-09 | 2022-04-05 | 上海深聪半导体有限责任公司 | Transmission management method, device, equipment and storage medium for multi-audio stream |
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