CN111666062A - Audio processing device and method and vehicle-mounted information entertainment system - Google Patents
Audio processing device and method and vehicle-mounted information entertainment system Download PDFInfo
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- G06F3/16—Sound input; Sound output
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- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
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Abstract
The invention provides an audio processing device, an audio processing method and a vehicle-mounted information entertainment system; the device comprises an independent external digital signal processor and an embedded digital signal processor embedded on a system-on-chip processor; the external digital signal processor is connected with the embedded digital signal processor through a digital audio bus; the external digital signal processor is used for executing a first audio operation; the embedded digital signal processor is used for executing a second audio operation; under the condition of basically keeping the hardware architecture of the traditional digital signal processor unchanged, the invention does not increase the extra hardware cost of the whole system; the method expands the processing function requirements of a plurality of new digital signal processors, such as active noise reduction, engine sound simulation or enhancement, vehicle sound warning and the like, thereby effectively meeting the increasing requirements of customers on the performance of the digital signal processors and realizing various complex digital signal processor audio processing algorithms.
Description
Technical Field
The invention relates to the field of electricity, in particular to an audio processing technology, and particularly relates to an audio processing device and method and a vehicle-mounted information entertainment system.
Background
The audio processing method in the existing vehicle-mounted infotainment system comprises the following two methods: the first method comprises the following steps: by an external stand-alone digital signal processor; the digital signal processors currently used as audio Processing in-vehicle infotainment systems do only some of the general Post Processing (Post Processing), therefore, the requirement for digital signal processor is low, generally 100MIPS (Million Instructions Per Second, average execution speed of single-length fixed-point Instructions, millions of machine language Instructions processed Per Second) is enough, however, as the demand for audio processing by customers increases, such as the demand for advanced sound effects, active noise reduction/simulation or engine enhancement (ANC/ESE), vehicle audio alert system (AVAS) and the like, the computational requirements may reach 300MIPS, which is increasingly not met by ordinary digital signal processors, therefore, a more powerful external digital signal processor is needed, but as a result, the cost is greatly increased, and the strict requirements of customers on the cost cannot be met; and the second method comprises the following steps: system-on-chip processor (SOC) embedded digital signal processor, many SOCs now have embedded digital signal processor inside, and possess stronger processing power, it is completely feasible in performance to do various audio processing, but embedded digital signal processor has many shortcomings: for example, it requires main CPU intervention, lengthy system initialization, and very slow start-up speed; the method has the advantages that a mature software development environment is not available, the customization degree is low, third party support is required, and various harsh KPI requirements (such as starting time and delay) of customers cannot be well met.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides an audio processing device, an audio processing method and a vehicle infotainment system, which are used for solving the problems that the digital signal processor for audio processing in the prior art is high in cost and cannot meet the requirements of customers.
To achieve the above object, the present invention provides an audio processing apparatus comprising: an independent external digital signal processor and an embedded digital signal processor embedded on the system-on-chip processor; the external digital signal processor is connected with the embedded digital signal processor through a digital audio bus; the external digital signal processor is used for executing a first audio operation; the embedded digital signal processor is used for executing a second audio operation.
In an embodiment of the present invention, the external digital signal processor and the embedded digital signal processor are commonly connected to an audio clock source.
In an embodiment of the invention, the operation content of the first audio operation includes any one or more of the following: receiving and processing a first audio signal; selecting a sound source; sound source mixing; adjusting the volume; and giving out an alarm sound.
In an embodiment of the invention, the first audio signal includes an audio signal sent by a radio and an audio signal sent by an external audio device.
In an embodiment of the invention, the second audio operation includes any one or more of the following: receiving and processing a second audio signal; echo cancellation; noise reduction; optimizing a sound source; actively reducing noise; and simulating engine sounds.
In an embodiment of the invention, the second audio signal includes a human voice and an environmental noise.
In an embodiment of the invention, the system-on-chip processor is configured to decode and play audio of a digital media; and for issuing navigation voice prompts.
In an embodiment of the present invention, the embedded dsp is connected to an intelligent terminal, and is configured to reduce or eliminate echo and environmental noise during a call of the intelligent terminal.
The invention provides an audio processing method, which comprises the following steps: dividing a digital signal processor for audio processing into a first digital signal processor and a second digital signal processor; wherein the first digital signal processor adopts an independent external digital signal processor; the second digital signal processor adopts an embedded digital signal processor embedded on the system-on-chip processor; establishing a processing rule; the processing rules specify operational content that the first digital signal processor is capable of processing and operational content that the second digital signal processor is capable of processing; and receiving an audio operation signal, and processing the audio operation signal through the first digital signal processor or the second digital signal processor according to the processing rule.
The invention provides a vehicle-mounted information entertainment system, which comprises the audio processing device and a loudspeaker; the loudspeaker is connected with an external digital signal processor of the audio processing device.
As described above, the audio processing apparatus, method and vehicle-mounted infotainment system according to the present invention have the following advantages:
(1) under the condition of basically keeping the hardware architecture of the traditional digital signal processor unchanged, the extra hardware cost of the whole system is not increased;
(2) the method expands the processing function requirements of a plurality of new digital signal processors, such as active noise reduction, engine sound simulation or enhancement, vehicle sound warning and the like, thereby effectively meeting the increasing requirements of customers on the performance of the digital signal processors and realizing various complex digital signal processor audio processing algorithms;
(3) the method has extremely high use and popularization values, and has the characteristics of wide applicability, low hardware cost, flexible realization and the like.
Drawings
Fig. 1 is a block diagram illustrating an operation of an audio processing apparatus according to an embodiment of the invention.
Fig. 2 is a block diagram illustrating an operation of an audio processing apparatus according to an embodiment of the invention.
Fig. 3 is a flowchart illustrating an audio processing method according to an embodiment of the invention.
FIG. 4 is a schematic structural diagram of an in-vehicle infotainment system according to an embodiment of the invention.
Description of the reference symbols
11 an external digital signal processor;
a 12 system-on-a-chip processor;
13 a digital signal processor is embedded;
14 an audio clock source;
15, an intelligent terminal;
41 an audio processing means;
a 42-horn;
s31 to S33.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
The audio processing device, the audio processing method and the vehicle-mounted infotainment system do not increase the extra hardware cost of the whole system under the condition of basically keeping the hardware architecture of the traditional digital signal processor unchanged; the method expands the processing function requirements of a plurality of new digital signal processors, such as active noise reduction, engine sound simulation or enhancement, vehicle sound warning and the like, thereby effectively meeting the increasing requirements of customers on the performance of the digital signal processors and realizing various complex digital signal processor audio processing algorithms; the method has extremely high use and popularization values, and has the characteristics of wide applicability, low hardware cost, flexible realization and the like.
In one embodiment, as shown in fig. 1, the audio processing apparatus is applied to the field of in-vehicle infotainment systems, and the audio processing apparatus of the present invention includes a separate external digital signal processor 11 and an embedded digital signal processor 13 embedded in a system-on-chip processor 12.
It should be noted that the system on chip processor 12 (SOC) refers to a processor used in an in-vehicle infotainment system, and is generally an ARM core-based architecture.
In one embodiment, the system-on-chip processor 12 is configured to decode and play audio of digital media; and for issuing navigation voice prompts. In particular, digital media is typically stored on external or internal memory of the in-vehicle infotainment system (e.g., a U-disk, solid-state memory in the in-vehicle infotainment system, etc.), which requires the use of a SOC for audio decoding and playback.
The external digital signal processor 11 is connected with the embedded digital signal processor 13 through a digital audio bus; specifically, the transfer between the signals to be exchanged in the external digital signal processor 11 and the embedded digital signal processor 13 is realized by a digital audio bus.
It should be noted that the digital audio bus includes, but is not limited to, IIS (IIS bus is a bus standard established by philips for audio data transmission between digital audio devices), TDM (Time division multiplexing, i.e., a technology for transmitting multiple digitized signals on one transmission medium), and the TDM bus is mainly used for transmitting analog signals such as voltage and current.
The external digital signal processor 11 is used for executing a first audio operation; the embedded digital signal processor 13 is used to perform a second audio operation.
It should be noted that the external digital signal processor 11 is used for some basic audio processing functions (first audio operation), which have low requirements on the operational capability of the digital signal processor, but have high requirements on the real-time performance; the embedded digital signal processor 13 is used to handle some extended advanced audio processing functions (second audio operation).
In one embodiment, the external dsp 11 and the embedded dsp 13 are commonly connected to an audio clock source 14.
It should be noted that, the same audio clock source is allocated to the external digital signal processor 11 and the embedded digital signal processor 13, so as to ensure that the external digital signal processor 11 and the embedded digital signal processor 13 completely synchronize when processing the same audio.
In an embodiment, the operation content of the first audio operation includes any one or more of the following: receiving and processing a first audio signal; selecting a sound source; sound source mixing; adjusting the volume; and giving out an alarm sound.
Specifically, the external digital signal processor 11 includes a selector, a mixer, and an alarm generator thereon.
It should be noted that there are various sound sources in the car, but only one or more sound sources may be played at the same time, and the selector is a module for selecting the sound sources; when a plurality of sound sources need to be played simultaneously and need to be played in the same output channel, the sound sources need to be mixed, and the sound mixer is used for the work; when the automobile is started, various functions in the automobile need to be detected, when problems occur, real-time alarming is needed, and the alarming sound generator is used for sending out the alarming sound.
In one embodiment, the first audio signal includes an audio signal emitted from a radio and an audio signal emitted from an external audio device.
In one embodiment, the second audio operation includes any one or more of the following: receiving and processing a second audio signal; echo cancellation; noise reduction; optimizing a sound source; actively reducing noise; and simulating engine sounds.
Specifically, the embedded digital signal processor 13 includes an echo cancellation module, a noise reduction module, a sound source optimization module, an active noise reduction module, and an engine sound simulation module.
It should be noted that the echo cancellation module is used for reducing or eliminating echo and ambient noise in the vehicle; the noise reduction module is used for eliminating the environmental noise in the vehicle in order to improve the definition of voice when voice recognition or other voice in the vehicle is input; the sound source optimization module is used for improving the auditory effect of sound in the vehicle, and optimizing the characteristics of the original sound source by using some special audio processing algorithms according to the auditory characteristics of human ears; specifically, these algorithms include, but are not limited to, Sound Stage of Arkamys (Ajiamies), CS-AUTO of CTS, Dolby Logic; the active noise reduction module is an algorithm for actively eliminating the noise of the internal and external environments of the vehicle, and the main principle is that the noise in the vehicle is sampled and analyzed to generate a sound wave with opposite phases and an original noise sound wave to be superposed, so that the purpose of eliminating the original noise is achieved; the engine sound simulation module is used for simulating or enhancing engine sound according to the vehicle speed and the state of the engine.
In one embodiment, the second audio signal includes human voice and environmental noise.
It should be noted that the human voice refers to the speaking voice of a human, including but not limited to the voice of making a call, voice recognition, etc.; the environmental noise comprises environmental noise inside and outside the vehicle; in order to filter out these noises, they need to be collected and analyzed, and eventually slowed down or eliminated.
In one embodiment, the embedded dsp 13 is connected to the intelligent terminal 15 for reducing or eliminating echo and environmental noise during the call of the intelligent terminal.
It should be noted that, when the vehicle-mounted infotainment system and the intelligent terminal 15 are used for performing the bluetooth hands-free call function, the vehicle-mounted infotainment system and the intelligent terminal 15 need to be connected in a wired or wireless manner.
Specifically, the intelligent terminal 15 is connected to the echo cancellation module/noise reduction module of the embedded digital signal processor 13, and the echo and the ambient noise in the call of the intelligent terminal can be effectively reduced or eliminated through the echo cancellation module/noise reduction module.
It should be noted that the intelligent terminal 15 includes, but is not limited to, a smart phone, a tablet computer, a PDA, and other terminal devices with data processing functions; generally, an intelligent terminal is a terminal device that has an independent operating system, can be used by a user to install programs provided by third-party service providers such as software and games, continuously expands the functions of a handheld device through the programs, and can realize wireless network access through a mobile communication network.
The working principle of the audio processing device is as follows:
the external digital signal processor and the digital signal processor embedded in the SOC are considered as a whole, but various functional modules required by the digital signal processor are reasonably divided and distributed in the two digital signal processors for operation; wherein some basic audio processing functions are placed in an external digital signal processor, and some extended advanced audio processing functions are placed in a digital signal processor embedded in the SOC; meanwhile, the digital audio bus is used for transferring signals required to be exchanged in the two digital signal processors.
The audio processing device of the present invention is further verified by the following specific examples.
As shown in fig. 2, in a practical application scenario, in the case of listening to a radio, the sound of the radio is simply processed by an external digital signal processor, sent to an embedded digital signal processor inside the SOC for processing by an algorithm of a high level sound effect, and then sent back to the external digital signal processor; meanwhile, in order to achieve the effect of active noise reduction, an active noise reduction module in the embedded digital signal processor generates an audio frequency with the phase opposite to that of the noise and the same amplitude through processing and analyzing the external noise, then the audio frequency is sent into the external digital signal processor, sound mixing processing is carried out through a sound mixer of the external digital signal processor, and finally the audio frequency is sent to an external loudspeaker for playing.
As shown in fig. 3, in an embodiment, the audio processing method of the present invention includes the following steps:
step S31, the digital signal processor for audio processing is divided into a first digital signal processor and a second digital signal processor.
Wherein the first digital signal processor adopts an independent external digital signal processor; the second digital signal processor adopts an embedded digital signal processor embedded on the system-on-chip processor.
And step S32, establishing a processing rule.
It should be noted that the processing rule specifies the operation content that can be processed by the first digital signal processor and the operation content that can be processed by the second digital signal processor.
Specifically, the operation content that the first digital signal processor can process includes but is not limited to: receiving and processing a first audio signal; selecting a sound source; sound source mixing; adjusting the volume; and sending out an alarm sound; the first audio signal comprises an audio signal sent by a radio and an audio signal sent by external audio equipment; the operation contents that the second digital signal processor can process include but are not limited to: receiving and processing a second audio signal; echo cancellation; noise reduction; optimizing a sound source; actively reducing noise; and simulating an engine sound; wherein the second audio signal comprises human voice and ambient noise.
And step S33, receiving an audio operation signal, and processing the audio operation signal through the first digital signal processor or the second digital signal processor according to the processing rule.
Specifically, it is determined whether the audio operation signal belongs to the operation content that the first digital signal processor can process or belongs to the operation content that the second digital signal processor can process; if the operation content belongs to the operation content which can be processed by the first digital signal processor, processing by the first digital signal processor; otherwise, the second digital signal processor processes the data.
It should be noted that the operation principle of the audio processing method is the same as that of the audio processing apparatus, and is not described herein again.
As shown in FIG. 4, in one embodiment, the vehicle infotainment system of the present invention includes the audio processing device 41 and the speaker 42; the speaker 42 is connected to an external digital signal processor of the audio processing device 41.
In summary, the audio processing apparatus, method and vehicle-mounted infotainment system of the present invention do not increase the extra hardware cost of the whole system under the condition of basically keeping the hardware architecture of the traditional digital signal processor unchanged; the method expands the processing function requirements of a plurality of new digital signal processors, such as active noise reduction, engine sound simulation or enhancement, vehicle sound warning and the like, thereby effectively meeting the increasing requirements of customers on the performance of the digital signal processors and realizing various complex digital signal processor audio processing algorithms; the method has the characteristics of extremely high use and popularization values, wide applicability, low hardware cost, flexible realization and the like, so that the method effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An audio processing apparatus, comprising: an independent external digital signal processor and an embedded digital signal processor embedded on the system-on-chip processor;
the external digital signal processor is connected with the embedded digital signal processor through a digital audio bus; the external digital signal processor is used for executing a first audio operation; the embedded digital signal processor is used for executing a second audio operation.
2. The audio processing apparatus according to claim 1, wherein an audio clock source is connected to the external dsp and the embedded dsp.
3. The audio processing apparatus according to claim 1, wherein the operation content of the first audio operation includes any one or more of:
receiving and processing a first audio signal;
selecting a sound source;
sound source mixing;
adjusting the volume; and
and giving out an alarm sound.
4. The audio processing apparatus according to claim 3, wherein the first audio signal comprises an audio signal emitted from a radio and an audio signal emitted from an external audio device.
5. The audio processing apparatus according to claim 1, wherein the second audio operation comprises any one or more of:
receiving and processing a second audio signal;
echo cancellation;
noise reduction;
optimizing a sound source;
actively reducing noise; and
an engine sound is simulated.
6. The audio processing apparatus according to claim 5, wherein the second audio signal comprises a human voice and an ambient noise.
7. The audio processing apparatus as claimed in claim 1, wherein the system-on-chip processor is configured to decode and play audio of digital media; and for issuing navigation voice prompts.
8. The audio processing apparatus according to claim 1, wherein the embedded dsp is connected to a smart terminal for reducing or eliminating echo and ambient noise during a call of the smart terminal.
9. An audio processing method, comprising the steps of:
dividing a digital signal processor for audio processing into a first digital signal processor and a second digital signal processor; wherein the first digital signal processor adopts an independent external digital signal processor; the second digital signal processor adopts an embedded digital signal processor embedded on the system-on-chip processor;
establishing a processing rule; the processing rules specify operational content that the first digital signal processor is capable of processing and operational content that the second digital signal processor is capable of processing;
and receiving an audio operation signal, and processing the audio operation signal through the first digital signal processor or the second digital signal processor according to the processing rule.
10. An in-vehicle infotainment system, characterized in that it comprises an audio processing device according to any one of claims 1 to 8 and a loudspeaker;
the loudspeaker is connected with an external digital signal processor of the audio processing device.
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| CN112440872A (en) * | 2020-11-19 | 2021-03-05 | 湖南工程学院 | Auxiliary driving equipment for medium and large-sized automobiles and working method thereof |
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| CN112440872A (en) * | 2020-11-19 | 2021-03-05 | 湖南工程学院 | Auxiliary driving equipment for medium and large-sized automobiles and working method thereof |
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