CN109348453B - Audio transmission method and system based on vehicle-mounted Ethernet - Google Patents
Audio transmission method and system based on vehicle-mounted Ethernet Download PDFInfo
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- CN109348453B CN109348453B CN201811102526.5A CN201811102526A CN109348453B CN 109348453 B CN109348453 B CN 109348453B CN 201811102526 A CN201811102526 A CN 201811102526A CN 109348453 B CN109348453 B CN 109348453B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005236 sound signal Effects 0.000 claims description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
- H04H20/62—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast for transportation systems, e.g. in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/805—QOS or priority aware
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The invention discloses a method and a system for audio transmission based on a vehicle-mounted Ethernet, comprising an HU module, a central gateway and an intelligent antenna module; the HU module comprises an HU core processor, a codec chip, a vehicle-mounted Ethernet PHY chip and a microphone which are respectively connected with the HU core processor, a power amplifier connected with the codec chip and a loudspeaker connected with the power amplifier; the vehicle-mounted Ethernet PHY chip is connected with the central gateway; the intelligent antenna module comprises an intelligent antenna core processor, and a radio chip, a Bluetooth module and an intelligent antenna Ethernet PHY chip which are respectively connected with the intelligent antenna core processor; and the intelligent antenna Ethernet PHY chip is connected with the central gateway. The invention can realize audio transmission by vehicle Ethernet with low cost.
Description
Technical Field
The invention belongs to the technical field of vehicle audio transmission, and particularly relates to an audio transmission method and system based on a vehicle-mounted Ethernet.
Background
The existing vehicle-mounted audio transmission system generally adopts a coaxial cable to transmit audio data, and an FM/AM demodulation chip and a bluetooth module are arranged at a center console. The existing vehicle-mounted audio transmission system has the following problems: (1) the radio frequency signal is unstable; (2) coaxial cables are relatively costly.
With the rapid development of electronic technology, the network communication protocols in automobiles are also in the endlessly. The CAN bus was invented by Bosch in 1986. In 1998, companies such as bme, devler cleisler, and haman have established the MOST alliance, aiming to promote MOST technology to become a general standard for multimedia networks. The same year LIN assumption was first proposed. The FlexRay alliance was established and advanced to the standardization of FlexRay in 2000. In 2015, the bosch company introduced a vehicle-mounted ethernet, which has the advantages of large bandwidth, low equipment cost and the like and can be used for transmitting control signals and audio and video data signals.
In order to solve the problems of the existing vehicle-mounted audio transmission system, it is necessary to develop a method and a system for audio transmission based on a vehicle-mounted ethernet.
Disclosure of Invention
The invention aims to provide a method and a system for audio transmission based on a vehicle-mounted Ethernet, which are used for audio transmission and have low cost.
The system for audio transmission based on the vehicle-mounted Ethernet comprises an HU (namely a vehicle-mounted entertainment system) module, a central gateway and an intelligent antenna module;
the HU module comprises an HU core processor, a codec chip, a vehicle-mounted Ethernet PHY chip and a microphone which are respectively connected with the HU core processor, a power amplifier connected with the codec chip and a loudspeaker connected with the power amplifier; the vehicle-mounted Ethernet PHY chip is connected with the central gateway;
the intelligent antenna module comprises an intelligent antenna core processor, and a radio chip, a Bluetooth module and an intelligent antenna Ethernet PHY (namely a port physical layer) chip which are respectively connected with the intelligent antenna core processor; and the intelligent antenna Ethernet PHY chip is connected with the central gateway.
The smart antenna core processor and the Bluetooth module are arranged on the ceiling of the vehicle to solve the problem that the Bluetooth radio frequency performance is poor in the prior art.
The invention relates to a vehicle-mounted Ethernet-based audio transmission method, which adopts a vehicle-mounted Ethernet-based audio transmission system, and comprises the following steps:
the radio chip demodulates received FM (frequency modulation)/AM (amplitude modulation) audio data and transmits the demodulated audio data to the intelligent antenna core processor, the intelligent antenna core processor sends the audio data to the central gateway through a UDP (user datagram protocol), the central gateway forwards the audio data to the HU module, and the HU module receives the audio data through the vehicle-mounted Ethernet, decodes the audio data through the codec chip and then drives the loudspeaker through the power amplifier to play the audio data;
the audio data of downlink Bluetooth telephone and Bluetooth music are sampled and then transmitted to the intelligent antenna core processor through PCM (pulse code modulation), then the audio data are sent to the central gateway through a UDP (user Datagram protocol), the central gateway forwards the audio data to the HU module, and the HU module receives the audio data through the vehicle-mounted Ethernet and then plays the audio data through a power amplifier driving loudspeaker after decoding through a codec chip.
The method comprises the steps that audio data of a Bluetooth telephone uplink are collected through a microphone of an HU module, then converted into digital signals through a codec chip and forwarded to a central gateway, and the digital signals are sent to an intelligent antenna module through the central gateway; the intelligent antenna module receives the data and sends the data to the Bluetooth module through the PCM.
Further, all big data services transmitted through the vehicle-mounted Ethernet must subscribe services to the central gateway, the central gateway arbitrates according to the predicted bandwidth, the priority and the current bandwidth use condition, if the services can be used, the central gateway sends a control signal to the data initiator to start data transmission, and if not, the services are refused to be executed.
Further, the central gateway stores relevant information of the whole vehicle service in advance, including bandwidth required by the service and service priority; dynamically maintaining the current service pool in real time;
in response to a certain service request being initiated, the HU module sends the service request to the central gateway,
the central gateway judges according to the current bandwidth use condition, the priority of the service and the condition that the service needs to use the bandwidth; if the current residual bandwidth is larger than the bandwidth required by the service, the service request is approved, and the central gateway initiates a request for transmitting the audio signal to the intelligent antenna module; if the current residual bandwidth is smaller than the bandwidth required by the service, traversing the service of the current occupied bandwidth, if the priority of the service of the current occupied bandwidth is smaller than that of the request service and the residual bandwidth meets the bandwidth of the current request service after the service with low priority is stopped, stopping the service of the bandwidth with low priority and distributing the bandwidth to the newly requested service, and if the priorities of all occupied services are higher than that of the current requested service, refusing to execute the service.
Further, the big data service includes audio and video data transmission; services that do not include control signals and GPS (i.e., global positioning system).
Further, when a certain service is detected to be quitted for use, the HU module initiates to stop the service and notifies the central gateway, and the central gateway notifies the intelligent antenna module to stop transmitting data, deletes the service from the current service pool, and releases the bandwidth occupied by the service.
The invention has the following advantages:
(1) by designing a low-cost upper layer service protocol, the bandwidth is ensured to be controllable, so that the audio transmission is realized by only using TCP (transmission control protocol)/UDP (user datagram protocol);
(2) the problems of unstable radio frequency signals and high cost of coaxial cables in the conventional vehicle-mounted audio transmission system can be solved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a flow chart of the present invention;
in the figure: 1. smart antenna module, 1a, radio chip, 1b, smart antenna core processor, 1c, bluetooth module, 1d, smart antenna ethernet PHY chip, 2, central gateway, 3, HU module, 3a, on-vehicle ethernet PHY chip, 3b, microphone, 3c, HU core processor, 3d, codec chip, 3e, power amplifier, 3f, loudspeaker.
Detailed Description
The invention will be further explained with reference to the drawings.
The system for vehicle ethernet based audio transmission as shown in fig. 1 comprises a HU module 3, a central gateway 2 and a smart antenna module 1.
As shown in fig. 1, the HU module 3 includes a HU core processor 3c, a codec chip 3d, an on-vehicle ethernet PHY chip 3a, and a microphone 3b connected to the HU core processor 3c, respectively, a power amplifier 3e connected to the codec chip 3d, and a speaker 3f connected to the power amplifier 3 e; the vehicle-mounted Ethernet PHY chip 3a is connected with the central gateway 2.
As shown in fig. 1, the smart antenna module 1 includes a smart antenna core processor 1b, and a radio chip 1a (for example, FM/AM demodulation chip), a bluetooth module 1c and a smart antenna ethernet PHY chip 1d respectively connected to the smart antenna core processor 1 b; the intelligent antenna Ethernet PHY chip 1d is connected with the central gateway 2.
The central gateway 2 mainly uses the forwarding function of its on-board ethernet, and arbitrates the transmission service, and implements broadband control in a simple and low-cost manner. In this embodiment, the vehicle-mounted ethernet is used to transmit audio data, where the audio data includes FM (frequency modulation)/AM (amplitude modulation), bluetooth phone, bluetooth music, E-CALL (emergency rescue service), and the like.
In this embodiment, the radio chip 1a and the bluetooth module 1c are disposed on the ceiling of the vehicle to solve the problem of poor bluetooth radio frequency performance in the prior art.
The invention relates to a vehicle-mounted Ethernet-based audio transmission method, which adopts a vehicle-mounted Ethernet-based audio transmission system, and comprises the following steps:
the radio chip 1a demodulates the received FM/AM audio data, and transmits the audio data to the intelligent antenna core processor 1b through I2S (namely, an integrated circuit built-in audio bus), the intelligent antenna core processor 1b sends the audio data to the central gateway 2 through a UDP protocol, the central gateway 2 forwards the audio data to the HU module 3, and the HU module 3 receives the audio data through the vehicle-mounted Ethernet, decodes the audio data through the codec chip 3d, and then drives the loudspeaker 3f to play through the power amplifier 3 e.
Transmit smart antenna core processor 1b through PCM after audio data sampling with bluetooth telephone is down and bluetooth music, then send audio data to central gateway 2 through the UDP agreement, central gateway 2 forwards audio data to HU module 3 again, HU module 3 receives audio data through on-vehicle ethernet after, decodes the back through codec chip 3d and plays through power amplifier 3e drive loudspeaker 3 f.
The uplink audio data of the Bluetooth telephone is collected through a microphone 3b of the HU module 3, then is converted into a digital signal through a codec chip 3d and is forwarded to the central gateway 2, and the digital signal is sent to the intelligent antenna module 1 through the central gateway 2; the intelligent antenna module 1 sends the received data to the Bluetooth module 1c through the PCM.
In this embodiment, the method for audio transmission based on the vehicle-mounted ethernet further includes: all big data services transmitted through the vehicle-mounted Ethernet must subscribe services to the central gateway 2, the central gateway 2 decides according to the predicted bandwidth, the priority and the current bandwidth use condition, if the services can be used, the central gateway 2 sends a control signal to a data initiator to start data transmission, otherwise, the services are refused to be executed. The method specifically comprises the following steps: when a certain service request is initiated, the HU module 3 sends the service request to the central gateway 2, and the central gateway 2 determines according to the current bandwidth use condition, the priority of the service, and the condition that the service needs to use the bandwidth; if the current residual bandwidth is larger than the bandwidth required by the service, the service request is approved, and the central gateway 2 initiates a request for transmitting the audio signal to the intelligent antenna module 1; if the current residual bandwidth is smaller than the bandwidth required by the service, traversing the service of the current occupied bandwidth, if the priority of the service of the current occupied bandwidth is smaller than that of the request service and the residual bandwidth meets the bandwidth of the current request service after the service with low priority is stopped, stopping the service of the bandwidth with low priority and distributing the bandwidth to the newly requested service, and if the priorities of all occupied services are higher than that of the current requested service, refusing to execute the service. As shown in fig. 2, the control logic is explained in detail by taking a radio as an example:
after a user clicks to use a radio, the HU module 3 sends a radio audio transmission service request to the central gateway 2, and the central gateway 2 judges according to the current bandwidth use condition, the priority of the service and the condition that the service needs to use the bandwidth. If the current residual bandwidth is larger than the bandwidth required by the service, the service request is approved, and the central gateway 2 initiates a request for transmitting FM/AM audio signals to the intelligent antenna module 1; if the current residual bandwidth is less than the bandwidth required by the service, traversing the service of the current occupied bandwidth, if the priority of the service of the current occupied bandwidth is less than that of the request service and the residual bandwidth meets the bandwidth of the current request service after the service of low priority is stopped, stopping the service of the bandwidth with low priority and distributing the bandwidth to the newly requested service, and if the priorities of all the occupied services are higher than that of the current request service, refusing to execute the service.
In this embodiment, the method for audio transmission based on the vehicle-mounted ethernet further includes: the central gateway 2 prestores relevant information of the whole vehicle service, including bandwidth required by the service and service priority; and dynamically maintaining the current service pool in real time. The service pool information of the reference design is shown in table 1.
| Service name | Service request bandwidth | Priority (higher and smaller number) |
| E-CALL | *Mb | 0 |
| Bluetooth telephone | *Mb | 1 |
| Radio receiver | * |
3 |
| Bluetooth music | * |
2 |
In this embodiment, the big data service includes audio and video data transmission; services of small data such as control signals and GPS are not included.
In this embodiment, the method for audio transmission based on the vehicle-mounted ethernet further includes: in response to detecting that a certain service exits from use, the HU module 3 initiates to stop the service and notifies the central gateway 2, and the central gateway 2 notifies the smart antenna module 1 to stop transmitting data, deletes the service from the current service pool, and releases the bandwidth occupied by the service. As shown in fig. 2, the following description will be made by taking a radio as an example: when the user quits using the radio, the HU module 3 initiates to stop the service and notifies the central gateway 2, the central gateway 2 notifies the smart antenna module 1 to stop transmitting the audio data, and deletes the service from the current service pool, and releases the bandwidth occupied by the service.
In the embodiment, the bandwidth is ensured to be controllable by designing a low-cost upper layer service protocol, so that the audio transmission is realized by only using TCP/UDP.
Claims (3)
1. A system for audio transmission based on vehicle-mounted Ethernet is characterized in that: the system comprises an HU module (3), a central gateway (2) and an intelligent antenna module (1); the HU module (3) comprises a HU core processor (3 c), a codec chip (3 d), a vehicle-mounted Ethernet PHY chip (3 a) and a microphone (3 b) which are respectively connected with the HU core processor (3 c), a power amplifier (3 e) connected with the codec chip (3 d), and a loudspeaker (3 f) connected with the power amplifier (3 e); the vehicle-mounted Ethernet PHY chip (3 a) is connected with the central gateway (2); the intelligent antenna module (1) comprises an intelligent antenna core processor (1 b), and a radio chip (1 a), a Bluetooth module (1 c) and an intelligent antenna Ethernet PHY chip (1 d) which are respectively connected with the intelligent antenna core processor (1 b); the intelligent antenna Ethernet PHY chip (1 d) is connected with the central gateway (2); the intelligent antenna core processor (1 b) and the Bluetooth module (1 c) are arranged at the ceiling of the vehicle;
the radio chip (1 a) demodulates received FM/AM audio data and transmits the demodulated audio data to the intelligent antenna core processor (1 b), the intelligent antenna core processor (1 b) sends the audio data to the central gateway (2) through a UDP protocol, the central gateway (2) forwards the audio data to the HU module (3), and the HU module (3) receives the audio data through the vehicle-mounted Ethernet, decodes the audio data through the codec chip (3 d), and then drives the loudspeaker (3 f) to play through the power amplifier (3 e);
the audio data of downlink Bluetooth telephone and Bluetooth music are sampled and transmitted to an intelligent antenna core processor (1 b) through PCM, then the audio data are sent to a central gateway (2) through a UDP protocol, the central gateway (2) forwards the audio data to an HU module (3), and the HU module (3) receives the audio data through a vehicle-mounted Ethernet, decodes the audio data through a codec chip (3 d), and then drives a loudspeaker (3 f) to play through a power amplifier (3 e);
the method comprises the steps that audio data of a Bluetooth telephone uplink are collected through a microphone (3 b) of an HU module (3), then converted into digital signals through a codec chip (3 d), and forwarded to a central gateway (2), and the digital signals are sent to an intelligent antenna module (1) through the central gateway (2); the intelligent antenna module (1) receives the data and sends the data to the Bluetooth module (1 c) through PCM;
all big data services transmitted through the vehicle-mounted Ethernet must subscribe services to the central gateway (2), the central gateway (2) decides according to the predicted bandwidth, priority and current bandwidth use condition, if the services can be used, the central gateway (2) sends a control signal to a data initiator to start data transmission, otherwise, the services are refused to be executed;
the central gateway (2) stores relevant information of the whole vehicle service in advance, including bandwidth required by the service and service priority; dynamically maintaining the current service pool in real time;
when a certain service request is initiated, the HU module (3) sends the service request to the central gateway (2), and the central gateway (2) judges according to the current bandwidth use condition, the priority of the service and the condition that the service needs to use the bandwidth; if the current residual bandwidth is larger than the bandwidth required by the service, the service request is approved, and the central gateway (2) initiates a request for transmitting the audio signal to the intelligent antenna module (1); if the current residual bandwidth is smaller than the bandwidth required by the service, traversing the service of the current occupied bandwidth, if the priority of the service of the current occupied bandwidth is smaller than that of the request service and the residual bandwidth meets the bandwidth of the current request service after the service with low priority is stopped, stopping the service of the bandwidth with low priority and distributing the bandwidth to the newly requested service, and if the priorities of all occupied services are higher than that of the current requested service, refusing to execute the service.
2. The system for vehicle ethernet-based audio transmission according to claim 1, wherein: the big data service comprises audio and video data transmission; services that do not include control signals and GPS.
3. The system for vehicle ethernet-based audio transmission according to claim 2, wherein: when a certain service is detected to be quitted for use, the HU module (3) initiates to stop the service and informs the central gateway (2), the central gateway (2) informs the intelligent antenna module (1) to stop transmitting data, the service is deleted from the current service pool, and the bandwidth occupied by the service is released.
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| CN110136753A (en) * | 2019-04-26 | 2019-08-16 | 苏州凯云迪电子科技有限公司 | Distributed vehicle audio processing system and vehicle entertainment device |
| CN111988557B (en) * | 2019-05-22 | 2022-09-13 | 上汽通用汽车有限公司 | Vehicle-mounted video transmission method and vehicle-mounted video transmission system |
| CN111061499B (en) * | 2019-12-31 | 2023-06-13 | 上海赫千电子科技有限公司 | ECU updating method and system based on file system |
| CN112910513B (en) * | 2021-03-03 | 2022-04-15 | 立讯精密工业（昆山）有限公司 | Intelligent antenna system and communication method |
| CN116599906B (en) * | 2023-04-12 | 2024-07-05 | 芯沄科技(无锡)有限公司 | Chime playing method based on vehicle-mounted time sensitive network |
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