CN114745007A - Vehicle-mounted DAB system and working method thereof - Google Patents

Abstract

The application relates to a vehicle-mounted DAB system and a working method thereof, relating to the technical field of DAB, wherein the vehicle-mounted DAB system comprises: a DAB module; the vehicle-mounted IVI is in signal connection with the DAB module; the DAB antenna is in signal connection with the DAB module; the DAB module receives DAB frequency band signals based on a DAB antenna. The flexible configuration of the vehicle-mounted DAB system is realized based on the DAB module, the vehicle-mounted IVI and the DAB antenna, so that the current use requirement is met.

Description

A vehicle-mounted DAB system and its working method

technical field

The present application relates to the technical field of DAB, in particular to a vehicle-mounted DAB system and a working method thereof.

Background technique

Digital Audio Broadcasting (DAB) is the third generation of broadcasting after AM and FM traditional analog broadcasting - digital audio broadcasting. It provides sound close to CD quality, broadcasting and additional data services with unlimited business opportunities. The advantages of anti-noise, anti-interference, anti-radio wave propagation and fading, suitable for high-speed mobile reception, etc., ensure the quality of the received signal when fixed, carried and moved.

At present, there are not many applications of digital audio broadcasting in the domestic vehicle field. At present, it is mainly AM and FM traditional analog broadcasting radio entertainment. Some regions have gradually started the pilot promotion of digital audio broadcasting. In foreign countries, especially in Europe and the United States, the application of vehicle DAB is more popular. Most vehicles exported to such areas need to have DAB functional requirements.

Due to the differences in the development of DAB at home and abroad, domestic car manufacturers usually design two versions of multimedia displays for domestic models and exported models, that is, for domestic models, it is designed with a built-in FM/AM receiving module, and The multimedia display screen of related peripheral circuits is designed with a built-in DAB receiving module for some exported models. This development method will increase the research and development investment of the equipment, which is not conducive to the commercial application of the product.

Therefore, there is an urgent need for a flexible configuration technology of vehicle DAB functions to meet current usage requirements.

SUMMARY OF THE INVENTION

The present application provides a vehicle-mounted DAB system and a working method thereof. Based on the DAB module, the vehicle-mounted IVI and the DAB antenna, the flexible configuration of the vehicle-mounted DAB system can be realized to meet the current usage requirements.

In a first aspect, the application provides a vehicle-mounted DAB system, the system comprising:

DAB module;

A vehicle-mounted IVI signally connected to the DAB module;

A DAB antenna connected to the DAB module signal; wherein,

The DAB module receives DAB frequency band signals based on the DAB antenna.

Specifically, the DAB module includes an LDO module, a HUB module, an MCU module and a DAB radio module;

the LDO module, which performs voltage regulation conversion processing by receiving the current input by the vehicle IVI, and supplies power for the HUB module, the MCU module and the DAB radio module;

The HUB module is signal-connected with the MCU module, and is also used to provide an interactive portal for signal connection with external equipment;

The DAB radio module is connected to the DAB antenna and receives the DAB frequency band signal.

Specifically, the DAB radio module is the SI4684 radio chip of SILICON.

Specifically, the HUB module is Microchip's USB4914 USBHUB chip.

Specifically, the DAB module includes a first physical interface and a second physical interface;

The first physical interface is connected to the DAB antenna and receives DAB frequency band signals;

The second physical interface is connected to the USB interface of the vehicle-mounted IVI.

Specifically, the HUB module expands the USB channel of the in-vehicle IVI into two channels, one of which is signally connected to the MCU module, and the other is used as an interactive portal for signal connection with external devices.

In a second aspect, the present application provides a working method of the vehicle-mounted DAB system as mentioned in the first aspect, the method comprising the following steps:

Conduct signal frequency search;

Determine whether the radio signal strength of the current frequency meets the preset signal strength threshold;

If the signal strength threshold is met, send a station inquiry command;

If the radio signal is valid service status data, update the service list;

Based on the updated service list, program playback is performed.

Specifically, the service list records the radio signals that the in-vehicle DAB system can choose to play.

Specifically, the method further includes the following steps:

If it does not meet the signal strength threshold, inquire whether to continue playing the radio signal;

If it is confirmed to continue playing the radio station signal, a radio station inquiry command is sent.

In a third aspect, the present application provides a working method of the vehicle-mounted DAB system as mentioned in the first aspect, the method comprising the following steps:

According to the preset frequency band query range, query the signal of each radio station;

For each of the radio signals, send a radio query command;

If the station signal is valid service status data, a service list is constructed based on the corresponding station signal.

The beneficial effects brought by the technical solution provided by this application include:

Based on the DAB module, the vehicle-mounted IVI and the DAB antenna, the present application realizes the flexible configuration of the vehicle-mounted DAB system to meet the current usage requirements.

Description of drawings

Terminology Explanation:

DAB: Digital Audio Broadcasting, digital audio broadcasting;

IVI: In-Vehicle Infotainment/On-Board Infotainment, vehicle infotainment system;

LDO: Low Dropout Regulator, low dropout linear regulator;

HUB: multi-port forwarder;

MCU: Microcontroller Unit, micro control unit;

USB: Universal Serial Bus, Universal Serial Bus;

I2S: Inter-IC Sound, integrated circuit built-in audio bus;

SPI: SDH Physical Interface, SDH physical interface;

SDH: Synchronous Digital Hierarchy, synchronous digital system;

PTY: Program Type, program type;

DSL: Digital Subscriber Line, digital subscriber line;

GND: Wire ground terminal.

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a structural block diagram of a vehicle-mounted DAB system provided in an embodiment of the present application;

Fig. 2 is the structural block diagram of the DAB module provided in the embodiment of this application;

3 is a single station search process of the vehicle-mounted DAB system provided in the embodiment of the present application;

FIG. 4 is a full-frequency program search process of the vehicle-mounted DAB system provided in the embodiment of the application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiments of the present application provide a vehicle-mounted DAB system and a working method thereof. Based on the DAB module, the vehicle-mounted IVI, and the DAB antenna, flexible configuration of the vehicle-mounted DAB system can be realized to meet current usage requirements.

In order to achieve the above-mentioned technical effect, the general idea of the application is as follows:

A vehicle-mounted DAB system, the system includes:

DAB module;

A vehicle-mounted IVI signally connected to the DAB module;

A DAB antenna connected to the DAB module signal; wherein,

The DAB module receives DAB frequency band signals based on the DAB antenna.

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the first aspect, referring to FIGS. 1-2 , an embodiment of the present application provides a vehicle-mounted DAB system, which includes:

DAB module;

A vehicle-mounted IVI signally connected to the DAB module;

A DAB antenna connected to the DAB module signal; wherein,

The DAB module receives DAB frequency band signals based on the DAB antenna.

In the embodiment of the present application, based on the DAB module, the vehicle-mounted IVI and the DAB antenna, the flexible configuration of the vehicle-mounted DAB system is realized to meet the current usage requirements.

Specifically, the DAB module includes an LDO module, a HUB module, an MCU module and a DAB radio module;

the LDO module, which performs voltage regulation conversion processing by receiving the current input by the vehicle IVI, and supplies power for the HUB module, the MCU module and the DAB radio module;

The HUB module is signal-connected with the MCU module, and is also used to provide an interactive portal for signal connection with external equipment;

The DAB radio module is connected to the DAB antenna and receives the DAB frequency band signal.

Specifically, the DAB radio module is the SI4684 radio chip of SILICON.

Specifically, the HUB module is Microchip's USB4914 USBHUB chip.

Specifically, the DAB module includes a first physical interface and a second physical interface;

The first physical interface is connected to the DAB antenna and receives DAB frequency band signals;

The second physical interface is connected to the USB interface of the vehicle-mounted IVI.

Specifically, the HUB module expands the USB channel of the in-vehicle IVI into two channels, one of which is signally connected to the MCU module, and the other is used as an interactive portal for signal connection with external devices.

In the implementation process of the embodiment of the present application, the specific conditions are as follows:

As shown in FIG. 1 of the accompanying drawings, in the embodiment of the present application, the hardware foundation of the vehicle-mounted DAB system includes three parts: the vehicle-mounted IVI, the DAB module, and the DAB antenna; wherein,

The vehicle IVI is the multimedia display screen of the vehicle;

The DAB module has two physical interfaces, one interface is connected to the DAB antenna to receive DAB frequency signals, the other interface is connected to the USB interface of the vehicle IVI, and uses the USB communication protocol to communicate.

As shown in Figure 2 of the accompanying drawings, the DAB module includes an LDO module, a HUB module, an MCU module and a DAB radio module;

Among them, the LDO module performs voltage regulation and conversion processing on the 5V power input from the vehicle IVI, and supplies power for the HUB module, MCU module and DAB radio module;

The HUB module expands the USB signal into two channels, one USB output is used by users to connect U disk mobile phones, etc., to ensure normal charging and interactive entry functions for local multimedia entertainment playback, and the other communicates with the MCU module;

The DAB radio module is electrically connected to the external antenna to receive signals in the DAB frequency band.

Preferably, the DAB radio module can use the SI4684 radio chip of SILICON. In the embodiment of the present application, the I2S data interface can be used to transmit the audio signal to the MCU module. After the MCU module is powered on, the DAB radio module is controlled through the SPI data interface to achieve DAB radio module initialization, search control and other operations.

The car IVI splits the USB interface into two USB interface channels through the HUB module, and communicates with the MCU module all the way to realize DAB program information including program name, radio frequency, radio PTY information, radio DSL text information, radio strength, SLIDESHOW picture information and The upload of DAB and other program information such as program audio, and the other way for external or external U disk with audio or video content, mobile phones and other mobile media to be inserted to realize multimedia playback or mobile phone charging functions;

Based on the above technical solutions, the embodiments of the present application can use the DAB function without occupying USB interface resources.

Preferably, the HUB module can use Microchip's USB4914 USBHUB chip, so as to support data reading and writing of Android mobile phones or Apple mobile phones.

Based on the technical solutions of the embodiments of the present application, a DAB APK application can also be designed for the in-vehicle IVI and installed on the in-vehicle IVI;

When the vehicle IVI is powered on, the vehicle IVI supplies power to the DAB module through the USB interface;

When the user opens the DAB application, the in-vehicle IVI performs interactive connection authentication with the DAB module through the USB interface. If the device is not inserted, it will prompt that the DAB device is not connected, please connect to the DAB device;

If the connection authentication is passed, the in-vehicle IVI sends a query command to query the current state of the DAB radio module, and then according to the current state of the DAB radio module. Send the initialization configuration command.

In the second aspect, referring to FIG. 3 , on the basis of the technology of the vehicle-mounted DAB system mentioned in the first aspect, an embodiment of the present application provides a working method for the vehicle-mounted DAB system to perform single-station search and playback, and the method includes the following steps:

S1. Search for signal frequency;

S2. Determine whether the radio signal strength of the current frequency meets the preset signal strength threshold;

S3. If the signal strength threshold is met, send a radio station query instruction;

S4, if the radio signal is valid service status data, update the service list;

S5. Play the program based on the updated service list.

In the embodiment of the present application, based on the DAB module, the vehicle-mounted IVI and the DAB antenna, the flexible configuration of the vehicle-mounted DAB system is realized to meet the current usage requirements.

Specifically, the service list records the radio signals that the in-vehicle DAB system can choose to play.

Specifically, the method further includes the following steps:

If it does not meet the signal strength threshold, inquire whether to continue playing the radio signal;

If it is confirmed to continue playing the radio station signal, a radio station inquiry command is sent.

In specific implementation, on the basis of the vehicle DAB system mentioned in the first aspect, a DABAAPK application is designed for the vehicle IVI. After the system initialization configuration command installed on the vehicle IVI is completed, the user clicks the single radio icon, and the user clicks the single radio icon. The process shown in Figure 3 performs a single station search, and the specific process is as follows:

The first step, click the icon of the saved radio station in the APK history;

In the second step, the vehicle-mounted IVI instructs the DAB radio module to search for the radio station of the corresponding frequency according to the frequency information corresponding to the station logo in the database;

In the third step, the DAB radio module feeds back the initial data information of the current frequency, including the signal strength information of the frequency, and the vehicle-mounted IVI judges whether the signal strength of the current frequency station reaches the threshold;

The fourth step, if the signal is weak, the user will be prompted "The current station signal is weak, do you want to continue playing the current station?";

In the fifth step, if the signal strength reaches the corresponding preset threshold. Then send the sending frequency service query command;

The sixth step, if the vehicle IVI judges that the current frequency service is a valid service, it sends a query service list command;

In the seventh step, the DAB radio module uploads the service list data. After receiving the service list data, the vehicle-mounted IVI updates the interface interaction information such as icons and station logos. and play the current program content.

In a third aspect, referring to FIG. 4 , the present application provides a working method for performing full-frequency channel search by the vehicle-mounted DAB system as mentioned in the first aspect, and the method includes the following steps:

A1. According to the preset frequency band query range, query the signal of each radio station;

A2. For each radio station signal, send a radio station inquiry command;

A3. If the radio station signal is valid service status data, construct a service list based on the corresponding radio station signal.

In the embodiment of the present application, based on the DAB module, the vehicle-mounted IVI and the DAB antenna, the flexible configuration of the vehicle-mounted DAB system is realized to meet the current usage requirements.

In specific implementation, on the basis of the vehicle DAB system mentioned in the first aspect, a DABAAPK application is designed for the vehicle IVI. After the system initialization configuration command installed on the vehicle IVI is completed, the user clicks the single radio icon, and the user clicks the single radio icon. The process shown in Figure 4 performs full-band program search, and the specific process is as follows:

The first step, click the full-screen segment search icon;

The second step is to search from the lowest frequency point;

In the third step, the DAB radio module feeds back the initial data information of the current frequency, including the signal strength information of the frequency, and the IVI judges whether the signal strength of the current frequency station reaches the threshold;

The fourth step is to send an instruction to query the frequency service;

The fifth step, if it is valid service status data, send an instruction to query the service list;

The sixth step, the DAB radio module uploads the service list data, and after receiving the service list data, the vehicle-mounted IVI updates the interface interaction information such as icons and station logos;

In the seventh step, the next frequency point is searched according to the step, until all frequency points are searched, and the cross section information such as icons and icons of the service list are updated.

It should be noted that in this application, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that Any such actual relationship or sequence exists between these entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

The above are only specific embodiments of the present application, so that those skilled in the art can understand or realize the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, this application is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A vehicle-mounted DAB system, wherein the system comprises: DAB module; A vehicle-mounted IVI signally connected to the DAB module; A DAB antenna connected to the DAB module signal; wherein, The DAB module receives DAB frequency band signals based on the DAB antenna. 2. vehicle-mounted DAB system as claimed in claim 1, is characterized in that, described DAB module comprises LDO module, HUB module, MCU module and DAB radio module; The LDO module performs voltage regulation conversion processing by receiving the current input by the vehicle IVI, and supplies power for the HUB module, the MCU module and the DAB radio module; The HUB module is signal-connected with the MCU module, and is also used to provide an interactive portal for signal connection with external equipment; The DAB radio module is connected to the DAB antenna and receives the DAB frequency band signal. 3. vehicle-mounted DAB system as claimed in claim 1 is characterized in that: The DAB radio module is the SI4684 radio chip of SILICON. 4. vehicle-mounted DAB system as claimed in claim 1 is characterized in that: The HUB module is Microchip's USB4914 USBHUB chip. 5. vehicle-mounted DAB system as claimed in claim 1 is characterized in that: The DAB module includes a first physical interface and a second physical interface; The first physical interface is connected to the DAB antenna and receives DAB frequency band signals; The second physical interface is connected to the USB interface of the vehicle-mounted IVI. 6. vehicle-mounted DAB system as claimed in claim 2 is characterized in that: The HUB module expands the USB channel of the in-vehicle IVI into two channels, one of which is signally connected to the MCU module, and the other is used as an interactive entrance for signal connection with external devices. 7. the working method of the vehicle-mounted DAB system as claimed in claim 1, is characterized in that, described method comprises the following steps: Conduct signal frequency search; Determine whether the radio signal strength of the current frequency meets the preset signal strength threshold; If the signal strength threshold is met, send a station inquiry command; If the radio signal is valid service status data, update the service list; Based on the updated service list, program playback is performed. 8. the working method of vehicle-mounted DAB system as claimed in claim 7, is characterized in that: The service list records the radio signals that the in-vehicle DAB system can choose to play. 9. the working method of the vehicle-mounted DAB system as claimed in claim 7, is characterized in that, described method also comprises the following steps: If it does not meet the signal strength threshold, inquire whether to continue playing the radio signal; If it is confirmed to continue playing the radio station signal, a radio station inquiry command is sent. 10. A working method of the vehicle-mounted DAB system as claimed in claim 1, wherein the method comprises the following steps: According to the preset frequency band query range, query the signal of each radio station; For each of the radio signals, send a radio query command; If the station signal is valid service status data, a service list is constructed based on the corresponding station signal.

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