KR20180095250A - Apparatus and method for processing audio data using ethernet - Google Patents

Abstract

According to the present invention, an apparatus for processing audio data using Ethernet including audio video bridging (AVB) comprises: a digital signal processing unit generating and processing an audio data stream; a microcomputer including an Ethernet medium access control (MAC) module and an integrated interchip sound (I2S) port and packetizing the audio data stream received from the digital signal processing unit to be represented according to an Ethernet protocol; and an Ethernet communication unit receiving the packetized audio data stream and transmitting the packetized audio data stream to an external amplifier. Therefore, the apparatus can output sound within two seconds after starting a vehicle.

Description

[0001] APPARATUS AND METHOD FOR PROCESSING AUDIO DATA USING ETHERNET [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for processing audio data, and more particularly to an apparatus and method for processing audio data using Ethernet including audio-video bridging.

In recent years, Ethernet has been attracting attention in automobile networks, and Audio Video Bridging (AVB) has emerged as a next-generation vehicle network. These Ethernet AVBs are expected to replace existing vehicle interfaces and networks.

In this regard, in the related art, the Ethernet AVB is applied to the external amplifier as shown in FIG.

5 is a diagram illustrating an AVN system 500 according to the prior art.

In the conventional AVN (Audio Video Navigation) system 500, as shown in FIG. 5, there are three chipsets.

A microcomputer 510 for processing a power source and a vehicle, a digital signal processor 520 for performing radio broadcasting and overall audio processing, and an application processor 540 for implementing an application. In addition, the AVN system 500 may further include a PHY module 530, a memory 550, and the like.

Meanwhile, when the network system of the vehicle is connected to the external amplifier 560 by applying the Ethernet AVB, according to the former method, the three interfaces such as CAN (Controller Area Network), SPDIF (Sony Philips Digital Interface) However, when Ethernet is applied, all three of them can be integrated into only two wires.

However, in the AVN system 500 according to the related art, an OS such as Linux, Android, QNX and the like is mounted on the application processor 540, and it takes a considerable time to boot such OSs.

Usually, it takes 8-15 seconds to boot up after the vehicle starts up, so it takes a lot of waiting time to hear the sound through the Ethernet network.

In the case of a vehicle, for example, a sound is required to be outputted within at least 2 seconds, for example, a welcome sound of a driver opening the car door. In order to shorten the boot time, However, there are many cases where it is difficult to satisfy the conditions of development.

In this regard, Korean Patent Laid-Open Publication No. 10-2009-0008803 (title of the invention: apparatus and method for improving booting speed of a vehicle multimedia system) is a system for copying an OS image to a RAM A booting speed improvement apparatus and method of a multimedia system for a vehicle that can reduce boot time by eliminating time.

An embodiment of the present invention provides an audio data processing apparatus and method capable of outputting sound within 2 seconds after the start of a vehicle by using Ethernet including audio-video bridging in an OS-based system such as AVN.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided an apparatus for processing audio data using Ethernet, the apparatus including an Audio Video Bridging (AVB) according to the first aspect of the present invention, A signal processing unit, an Ethernet MAC (Medium Access Control) module, and an I2S (Integrated Interchip Sound) port, a microcomputer for packetizing the audio data stream received from the digital signal processing unit to be represented according to an Ethernet protocol, And an Ethernet communication unit for receiving the data stream and transmitting the data stream to the external amplifier.

According to a second aspect of the present invention, there is provided a method of processing audio data in an audio data processing apparatus using Ethernet, including audio video bridging (AVB), in which a microcomputer and an application processor are booted Starting; Performing a setting for data transmission / reception with the Ethernet communication unit and the digital signal processing unit through the microcomputer upon completion of the booting of the microcomputer; Activating a network connection with the Ethernet communication unit by the microcomputer; Receiving the audio data stream from the digital signal processor; Packetizing the audio data stream to be represented by the micom in accordance with the Ethernet protocol, and transmitting the packetized audio data stream to the Ethernet communication unit. Here, the microcomputer includes an Ethernet Medium Access Control (MAC) module and an Integrated Interchip Sound (I2S) port, and the Ethernet communication unit receives the packetized audio data stream and transmits the packetized audio data stream to an external amplifier.

According to any one of the above-described objects of the present invention, it is possible to overcome the restriction that occurs when an external AV amplifier is used in conjunction with an external AV amplifier.

Especially, it is possible to output sound through Ethernet AVB within 2 seconds after starting from AVN system based on OS of vehicle.

In addition, by applying Ethernet, it is possible to easily transmit a high-quality sound which was impossible in the prior art.

1 is a block diagram of an audio data processing apparatus according to an embodiment of the present invention.
2 is a block diagram of an audio data processing apparatus according to another embodiment of the present invention.
3 is a diagram for explaining contents of processing an audio data stream transmitted from a microcomputer and an application processor in an external amplifier.
4 is a flowchart of an audio data processing method according to an embodiment of the present invention.
5 is a diagram illustrating an AVN system 500 according to the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted.

Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise.

The present invention relates to an apparatus (100, 200) for processing audio data using Ethernet including audio-video bridging (AVB).

According to an embodiment of the present invention, in an OS-based system such as an AVN, the sound including the AVB can be output quickly within about two seconds after starting the vehicle.

Hereinafter, an audio data processing apparatus 100, 200 according to an embodiment of the present invention will be described with reference to FIG. 1 to FIG.

1 is a block diagram of an audio data processing apparatus 100 according to an embodiment of the present invention.

An audio data processing apparatus 100 according to an embodiment of the present invention includes a microcomputer 110, a digital signal processing unit 120, and an Ethernet communication unit 130. The audio data processing apparatus 100 may be included in the head unit of the vehicle.

The digital signal processing unit 120 generates an audio data stream such as radio or audio.

The microcomputer 110 includes an Ethernet Medium Access Control (MAC) module 111 and an Integrated Interchip Sound (I2S) port. The microcomputer 110 packetizes the audio data stream received from the digital signal processing unit 120 to be represented according to the Ethernet protocol And transmits it to the Ethernet communication unit 130.

At this time, the microcomputer 110 can receive the audio data stream from the digital signal processing unit 120 through the I2S port.

The microcomputer 110 may transmit the packetized audio data stream to the Ethernet communication unit 130 through the Ethernet MAC module 111. [

The Ethernet communication unit 130 includes an Ethernet switch 131 and a PHY module 133. The Ethernet communication unit 130 receives the packetized audio data stream and transmits the packetized audio data stream to the external amplifier 160. [ Accordingly, the external amplifier 160 amplifies the audio data stream and outputs the amplified audio data stream through the speaker 170.

The Ethernet switch 131 receives the packetized audio data stream and transmits the packetized audio data stream to the PHY module 133. The PHY module 133 transmits the packetized audio data stream to the external amplifier 160. [ At this time, the PHY module 133 includes a variety of logic, circuits, codes, and the like for transmitting and receiving physical layer symbols on a physical medium, which is a configuration for converting a data packet, which is an operation function of one of a plurality of operation functions, into a physical electrical signal can do.

In addition, the audio data processing apparatus 100 may further include an application processor 140, a memory 150, and the like.

The application processor 140 executes multimedia related applications.

An application and a program for driving the application are stored in the memory 150, and may be implemented as an SDRAM or a FLASH memory. However, the memory 150 is not necessarily limited to a compact flash (CF) card, a secure digital (SD) card, a memory stick, a solid-state drive Magnetic disk storage devices such as NAND flash memory, hard disk drive (HDD), and the like, and optical disk drives such as CD-ROM, DVD-ROM, etc., disc drive, and the like.

The booting time of the digital signal processor 120 controlled by the microcomputer 110 and the microcomputer 110 is set to be several tens of ms to several hundreds ms, The boot time is relatively faster than the boot time 140. [

Accordingly, during the booting of the application processor 140, the microcomputer 110 is booted before the application processor 140 and packetizing and transmitting the audio data stream prior to the application processor 140.

The microcomputer 100 sets up the Ethernet switch 131 for receiving and transmitting the audio data stream, and activates the network link.

That is, when receiving the audio data stream from the digital signal processing unit 120 through the I2S port, the microcomputer 110 obtains the MAC address of the Ethernet switch 131, packetizes the audio data stream to be transmitted, It is possible to transmit the packetized audio data stream through the MAC address to the Ethernet switch 131.

As described above, the audio data processing apparatus 100 according to an embodiment of the present invention is characterized in that the microcomputer 110 includes an Ethernet MAC module 111 and an I2S port. So that the degree of freedom of structure change can be secured and the price increase due to the performance improvement can be minimized.

2 is a block diagram of an audio data processing apparatus 200 according to another embodiment of the present invention.

The audio data processing apparatus 200 according to another embodiment of the present invention includes a microcomputer 210, a digital signal processing unit 220, and an Ethernet communication unit 230. Here, in the description of the embodiment shown in FIG. 2, contents overlapping with FIG. 1 will be omitted.

The microcomputer 210 includes a main microcomputer 210a and a submicrocomputer 210b.

The main microcomputer 210a performs power and vehicle interface processing in the same manner as a general microcomputer.

The sub microcomputer 210b includes an Ethernet MAC module 211b and an I2S port. Accordingly, the sub microcomputer 210b receives the audio data stream from the digital signal processing unit 220 through the I2S port.

After receiving the audio data stream, the sub-microcomputer 210b packetizes the received audio data stream to be represented according to the Ethernet protocol, and then transmits the packetized audio data stream through the Ethernet MAC module 211b to the Ethernet communication unit 230 send.

The Ethernet communication unit 230 includes an Ethernet switch 231 and a PHY module 233. The Ethernet switch 231 transmits the packetized audio data stream to the PHY module 233 and the PHY module 233 transmits the packetized audio data stream to the external amplifier 260.

As described above, the audio data processing apparatus 200 according to another embodiment of the present invention includes a main microcomputer 210a, a sub-microcomputer 210b having an Ethernet MAC module 211b and an I2S, This allows the flexibility of the platform to be maximized if the vehicle is equipped with an optional Ethernet AVB.

That is, there is no need to change the software of the main microcomputer 210a according to the application of the Ethernet AVB, nor does it require the basic hardware change, and the Ethernet AVB option can be added by merely installing additional components.

3 is a diagram for explaining contents of processing audio data streams transmitted from the microcomputers 110 and 210 and the application processors 140 and 240 by the external amplifiers 160 and 260. FIG.

In the case of the audio data processing apparatuses 100 and 200 described with reference to FIGS. 1 and 2, the booting of the application processors 140 and 240 is completed after the booting of the microcomputers 110 and 210 is completed.

When the application processors 140 and 240 are booted, the application processors 140 and 240 form a network link to the Ethernet switches 111 and 211 separately from the microcomputers 110 and 210.

Accordingly, the application processors 140 and 240 can transmit the audio data stream reproduced by the application processors 140 and 240 through the network, and the microcomputers 110 and 210 can transmit the audio data stream reproduced by the digital signal processors 120 and 220 to the network Lt; / RTI >

The Ethernet switches 131 and 231 do not transmit the sounds of both the microcomputers 110 and 210 and the application processors 140 and 240 selectively to the external amplifiers 160 and 260, It plays a role of carrying related packets on the network and transmitting them.

In this case, the external amplifiers 160 and 260 receive respective audio data streams having two network addresses.

The external amplifiers 160 and 260 may individually select and reproduce the respective audio data streams or simultaneously reproduce them. At this time, since the two audio data streams in the structure operate in different areas completely separated from each other, there is no problem such as a sound interruption due to the selection.

1 to 3 according to an embodiment of the present invention may be implemented in hardware such as software or an FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit) Roles can be performed.

However, 'components' are not meant to be limited to software or hardware, and each component may be configured to reside on an addressable storage medium and configured to play one or more processors.

Thus, by way of example, an element may comprise components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, Routines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

The components and functions provided within those components may be combined into a smaller number of components or further separated into additional components.

Hereinafter, a method of processing audio data in the audio data processing apparatuses 100 and 200 according to an embodiment of the present invention will be described with reference to FIG. The structure of the specific microcomputers 110 and 210 of the audio data processing apparatuses 100 and 200 according to the embodiment of the present invention and the microcomputers 110 and 210 according to another embodiment of the present invention are described with reference to FIGS. 1 and 2, do.

4 is a flowchart of an audio data processing method according to an embodiment of the present invention.

In the audio data processing method according to an embodiment of the present invention, when driving power is applied (S100), the microcomputer starts booting (S110).

Next, as the microcomputer is booted up (S111), the microcomputer performs settings for data transmission / reception with the Ethernet communication unit and the digital signal processing unit (S112).

Next, the microcomputer activates the network connection with the Ethernet communication unit (S113), and receives the audio data stream from the digital signal processing unit. At this time, the microcomputer can receive the audio data stream from the digital signal processing unit through the I2S port.

At this time, the digital signal processing unit can perform the setting for data transmission / reception with the microcomputer as the booting of the microcomputer is completed (S120). When the setting of the digital signal processing unit is completed, for example, if the audio data stream to be received is a radio, the FM / AM channel is set (S121), and the corresponding audio data stream is output (S122).

Upon receiving the audio data stream thus output, the microcomputer packetizes the audio data stream to be represented according to the Ethernet protocol (S114), and transmits the packetized audio data stream to the Ethernet communication unit for transmission to the external amplifier S115).

The Ethernet communication unit receives the packetized audio data stream and transmits it to the external amplifier (S140), and the external amplifier receives the packetized audio data stream and outputs the stream through the speaker (S150).

In this case, the Ethernet communication unit includes an Ethernet switch and a PHY module. The microcomputer acquires the MAC address of the Ethernet switch and transmits the packetized audio data stream to the Ethernet switch through the Ethernet MAC module. The audio data stream can be transmitted to the PHY module. Accordingly, the PHY module can transmit the packetized audio data stream to the external amplifier.

Meanwhile, the application processor may be booted by booting (S130), loading the boot loader (S131), loading the OS kernel and the framework (S132) as the driving power is applied.

When the booting is completed, the network connection is activated for transmission through the Ethernet communication unit (S133), the multimedia application is executed (S134), the obtained audio data stream is packetized (S135), and transmitted through the Ethernet network (S136).

In this case, the application processor can also transmit the audio data stream, so that the two audio data streams are transmitted to the external amplifier by the microcomputer and the application processor. In this case, as described in FIG. 3, It is possible to select one of them and output it at the same time or output it at the same time.

Meanwhile, in the above description, steps S100 to S150 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed. In addition, the contents already described in Figs. 1 to 3 can be applied to the audio data processing method of Fig. 4 even if other contents are omitted.

According to any one of the embodiments of the present invention, it is possible to overcome the constraints caused by interworking with the external amplifier using the Ethernet AVB network.

In particular, it is possible to output sound through Ethernet AVB within 2 seconds after startup in AVN system based on vehicle OS.

In addition, by applying Ethernet, it is possible to easily transmit a high-quality sound which was impossible in the prior art. In other words, in the conventional case, only stereo sound having 48 kHz and 16 bits could be transmitted. However, in the present invention, it is also possible to transmit 7.1-inch high-quality sound having 192 kHz and 24-bit specifications.

On the other hand, the control method according to an embodiment of the present invention can also be implemented in the form of a computer program stored in a medium executed by a computer or a recording medium including instructions executable by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100, 200: audio data processing device
110, 210: Microcomputer
210a: main microcomputer 210b: submicrocomputer
111, 211b: Ethernet MAC module
120, 220: digital signal processor
130, and 230: Ethernet communication unit
131, 231: Ethernet switch 133, 233: PHY module
140, 240: Application processor
150, 250: memory
160, 260: External Amplifier
170, 270: speaker

Claims (11)

1. An audio data processing apparatus using Ethernet including audio video bridging (AVB)
A digital signal processor for generating and processing an audio data stream,
A microcomputer including an Ethernet Medium Access Control (MAC) module and an Integrated Interchip Sound (I2S) port and packetizing the audio data stream received from the digital signal processor to be represented according to an Ethernet protocol;
And an Ethernet communication unit for receiving the packetized audio data stream and transmitting the packetized audio data stream to an external amplifier. The method according to claim 1,
Wherein the microcomputer receives the audio data stream from the digital signal processing unit via the I2S port. 3. The method of claim 2,
Wherein the microcomputer transmits the packetized audio data stream to the Ethernet communication unit through the Ethernet MAC module. The method of claim 3,
The Ethernet communication unit includes an Ethernet switch and a PHY module,
The Ethernet switch receives the packetized audio data stream and transmits the packetized audio data stream to the PYH module,
And the PHY module transmits the received packetized audio data stream to the external amplifier. 5. The method of claim 4,
The microcomputer sets the Ethernet switch, acquires the MAC address of the Ethernet switch, and transmits the packetized audio data stream to the Ethernet switch through the acquired MAC address, Audio data processing device. 6. The method according to any one of claims 1 to 5,
The microcomputer includes a main microcomputer and a sub-microcomputer,
The sub-micom includes the Ethernet MAC module and the I2S port, receives the audio data stream from the digital signal processor through the I2S port, and transmits the packetized audio data stream through the Ethernet MAC module to the Ethernet communication module To the audio data processing apparatus. 1. A method for processing audio data in an audio data processing apparatus using Ethernet including audio video bridging (AVB)
Starting booting the microcomputer as the driving power is applied;
Performing a setting for data transmission / reception with the Ethernet communication unit and the digital signal processing unit through the microcomputer upon completion of the booting of the microcomputer;
Activating a network connection with the Ethernet communication unit by the microcomputer;
Receiving the audio data stream from the digital signal processor;
Packetizing the audio data stream so that the microcomputer is represented according to an Ethernet protocol;
And transmitting the packetized audio data stream to the Ethernet communication unit by the microcomputer,
The microcomputer includes an Ethernet MAC module (Medium Access Control) and an I2S (Integrated Interchip Sound) port,
Wherein the Ethernet communication unit receives the packetized audio data stream and transmits the packetized audio data stream to an external amplifier. 8. The method of claim 7,
Wherein the step of the microcomputer receiving the audio data stream from the digital signal processing unit comprises:
And the audio data stream is received from the digital signal processing unit via the I2S port. 9. The method of claim 8,
The Ethernet communication unit includes an Ethernet switch and a PHY module,
Wherein the step of transmitting the packetized audio data stream to the Ethernet communication unit comprises:
Transmitting the packetized audio data stream to the Ethernet switch through the Ethernet MAC module;
The Ethernet switch transmitting the packetized audio data stream to a PHY module,
Wherein the packetized audio data stream is transmitted to the external amplifier through the PHY module. 10. The method of claim 9,
Wherein the activating of the network connection with the Ethernet communication unit comprises:
And obtaining the MAC address of the Ethernet switch,
Wherein the microcomputer transmits the packetized audio data stream to the Ethernet switch through the obtained MAC address. 11. The method according to any one of claims 7 to 10,
The microcomputer includes a main microcomputer and a sub-microcomputer,
Wherein the sub microcomputer includes the Ethernet MAC module and the I2S port,
Wherein the step of receiving the audio data stream comprises:
The sub-micom receives the audio data stream from the digital signal processing unit through the I2S port,
Wherein the step of transmitting the packetized audio data stream to the Ethernet communication unit comprises:
Wherein the submicrocomputer transmits the packetized audio data stream to the Ethernet switch through the Ethernet MAC module.

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