CN105301988A - MOST network based universal car audio development platform and signal transmission method - Google Patents
MOST network based universal car audio development platform and signal transmission method Download PDFInfo
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Abstract
The present invention relates to an MOST network based universal car audio development platform includes an MOST network module, an MCU module, a display module, an audio input and output module, an interface module, and a keyboard input module. The interface module includes an MOST control module connected with the MCU module in an I2C mode. The audio input and output module connects an MOST controller, and the display module electrically connects the MCU module. The MOST controller is provided with a functional block for realizing audio input/output. The present invention also relates to an audio input and output method based on the platform. The MOST network based universal car audio development platform is compatible with most car types having the MOST network, and meets various decoding requirements by keyboard configuration and I2S signal format automatic identification. The MOST network based universal car audio development platform is high in intelligent degree, is reliable and universal, and is convenient for developers to operate. The MOST network based universal car audio development platform reduces the development cost for mounting MOST equipment, and shortens the development period of MOST audio equipment.
Description
Technical field
The present invention relates to a kind of onboard audio input and output field, specifically a kind of universal onboard audio development platform based on MOST network and method for transmitting signals.
Background technology
MOST (MediaOrientedSystemsTransport, the Internet Transmission towards media) as a kind of bussing technique of media information, for whole-car firm provides a whole set of scheme solving audio frequency, transmission of video.Ge great depot (as BMW, benz, Audi etc.), according to application needs, according to MOST protocol specification, devises the MOST entertainment information transmission network of self.Extend the application protocol of MOST because vehicle complete vehicle manufacturers are self-defining and adopt the I2S audio format of differentiation, causing the vehicle that most of MOST equipment on the market can not be compatible different.
In MOST agreement, a part is general, and another part is that different depot is self-defining.So the equipment of MOST audio frequency input and output, both can by the protocol realization of common segment, again can according to the self-defining protocol realization of depot.Due to the otherness of different automobile types system realizing function, some former car audio frequency apparatuses are in order to realize more complicated function and realize some systemic-functions, and the self-defining agreement of depot all followed by the audio frequency apparatus on general former car.As, the CD of BMW is that BMW is self-defining, and the CD of Audi is that Audi is self-defining, although so be all MOST equipment, both CD equipment can not be used with.
On the other hand, general audio input-output device can not be used in MOST network, namely the audio frequency of self can not be uploaded to MOST network, can not get audio frequency, need particular design from MOST network.
But, the protocol function of AuxIn and AudioAmplifier is the common segment in MOST agreement, and should use relatively simple, the input and output demand of general audio frequency can be met again, so the advantage of this part in MOST agreement can be utilized, compatible most vehicle, reduces the workload in performance history, highly versatile.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: provide a kind of universal onboard audio development platform based on MOST network, can allow functional node common on MOST network, as: power amplifier, navigation module, CD modules etc., access in various MOST network, to improve versatility and the competitive power of Related product.
In order to solve the problem, the present invention proposes a kind of universal onboard audio development platform based on MOST network, comprise MOST network, MCU module, display module and audio frequency input/output module, it is characterized in that: also comprise the interface module be connected with described MOST network, MCU module and audio frequency input/output module respectively, the keyboard input module be electrically connected with described MCU module; Described interface module comprises the MOST control module be connected by I2C mode with described MCU module; Described audio frequency input/output module is connected with MOST controller, and described display module is electrically connected with MCU module; Be provided with in described MOST controller to realize the functional block of audio frequency output and the functional block in order to realize audio frequency input.
Preferably, be provided with INIC chip and photoelectric commutator in described MOST controller, wherein INIC chip is electrically connected with described audio frequency input/output module, and photoelectric commutator is arranged between INIC chip and MOST network.
Preferably, the model of described INIC chip is OS81050 or OS81060.
In order to solve the problem, the invention allows for a kind of universal onboard audio input output method based on MOST network, described method comprises:
S1.MOST network is set up to input or output with audio frequency input/output module and is connected;
In the connection of S2. setting up in step S1, the signal carried out between MOST network with audio frequency input/output module communicates.
Preferably, described step S1 comprises the steps:
The initialization of S101.MOST controller;
S102. determine whether audio frequency input pattern, if so, perform step S3, otherwise perform step S5;
S103. to MOST network host node registration AuxIn functional block;
S104. according to relevant configuration, set up audio frequency input and connect, terminate Connection Step;
S105. to MOST network host node registration AudioAmplifier functional block;
S106. according to relevant configuration, set up audio frequency and export connection, terminate Connection Step.
Wherein, AuxIn functional block and AudioAmplifier functional block are that MOST cooperates the general purpose function block specified in tissue.
Preferably, described method also comprised before step S1:
SA. audio configuration setting is carried out by keyboard input module;
Preferably, described audio configuration arranges and comprises audio frequency I/O pattern, the I2S signal format of output and optical fiber synchronization zone passage.
Preferably, described step SA comprises the steps:
SA01. the transmission direction of audio frequency is selected as required;
If be SA02. audio frequency input, enter audio frequency automatic identification model, the input key that audio format is selected lost efficacy; If audio frequency exports, then enter audio format preference pattern, by input key, audio format is selected.
Preferably, the signal format of described I2S is determined by bit clock speed and logical sampling resolution.
Preferably, the automatic identification model step of described audio format is as follows:
SA11. detect FSY pin and whether produce rising edge, if so, perform next step operation, otherwise circulation performs this step;
SA12. detect FSY pin and whether produce negative edge, if so, add up in the time cycle of FSY pin rising edge and negative edge, SCK produces the times N of rising edge, thus obtains bit clock speed and export recognition result, otherwise performs next step operation;
SA13. detect and produce in the time interval of rising edge for 18th ~ 25 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 16 bits and returns step SA12, otherwise performs next step operation;
SA14. detect and produce in the time interval of rising edge for 26th ~ 33 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 24 bits and returns step SA12, otherwise sampling resolution is continuous print and returns step SA12.
Compared with prior art, tool of the present invention has the following advantages:
One, the audio frequency input/output function agreement that the MOST system of most of depot of MOST cooperation tissue definition is all supported is selected, can compatibility most vehicle on the market.
Two, the mode selected by button configures audio format, the configuration in update routine is gone again after eliminating artificial survey waveform, but the I2S signal format directly needed by key configurations, to meet different decoding requirements, intelligence degree is high, and agile and all-purpose, is convenient to the use of developer, the present invention both can mate the I2S input of different-format on the other hand, and the I2S that also can generate specific format according to demand exports.
Three, support audio frequency input and output two-way function simultaneously, reduce the cost of development installing MOST equipment additional, shorten the construction cycle of MOST audio frequency apparatus.
Accompanying drawing explanation
Fig. 1 is the structural representation of the universal onboard audio development platform based on MOST network of the invention process.
Fig. 2 is the process flow diagram of the universal onboard audio input output method based on MOST network of the invention process.
Fig. 3 is the process flow diagram that the invention process identifies input signal I2S data layout automatically.
Fig. 4 is that the invention process inputs or outputs functional block registration and sets up the process flow diagram of relevant connection.
Fig. 5 sets up the particular flow sheet inputing or outputing connection in Fig. 3.
Embodiment
In order to allow those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, the present invention is further elaborated.
The specific embodiment of the present invention as shown in Figure 1, a kind of universal onboard audio development platform based on MOST network, comprise MOST network, MCU module, display module and audio frequency input/output module, it is characterized in that: also comprise the interface module be connected with described MOST network, MCU module and audio frequency input/output module respectively, the keyboard input module be electrically connected with described MCU module; Described interface module comprises the MOST control module be connected by I2C mode with described MCU module; Described audio frequency input/output module is connected with MOST controller, and described display module is electrically connected with MCU module; Be provided with in described MOST controller to realize the functional block of audio frequency output and the functional block in order to realize audio frequency input.
Be provided with INIC chip and photoelectric commutator in MOST controller 41, wherein INIC chip is electrically connected with described audio frequency input/output module, and photoelectric commutator is arranged between INIC chip and MOST network.
INIC is the abbreviation of IntelligentNetworkInterfaceController, is the network control chip of MOST.
The model of INIC chip is OS81050 or OS81060.
Based in the universal onboard audio development platform of MOST network, propose a kind of universal onboard audio input output method based on MOST network, as shown in Fig. 2 ~ Fig. 5, the performing step of the method is as follows:
S1. system electrification, carries out audio configuration setting by keyboard input module.
Audio configuration arranges and comprises audio frequency I/O pattern, the I2S signal format of output and optical fiber synchronization zone passage.
First, the selection of audio frequency I/O pattern is carried out.The input and output functional block that correspondence is different respectively of audio frequency is realize the AudioAmplifier functional block of audio frequency output and the AuxIn functional block in order to realize audio frequency input respectively.When setting up voice-grade channel and connecting, the selection of channel direction, is and inputs or outputs.Being embodied in keyboard input module is then IN/OUT button, in order to realize selecting between audio frequency input and output function.
Then, the selection of I2S form is carried out.In MOST agreement, the signal format of I2S is determined by bit clock speed and sampling resolution.Concrete form is as shown in the table, and following table only lists 3 kinds of I2S signal formats.
The parameter of table 1I2S signal format
In table 1, SCKRate is bit clock speed, and SocketSize is sampling resolution, and Fs is frame clock, usual value 44.1K/48K, and in same MOST network, frame clock is determined and is unique.
When being chosen as audio output mode, selected the parameter of I2S by button.When being embodied on keyboard input module, for pressing SCKRate button successively, in three kinds of forms, circulation is selected, and display screen can show selection result in real time in appointed area.The selection of SocketSize button is also that same mode is configured.
When being chosen as audio frequency input pattern, by three pins (FSY, SCK, DATA) of I2S, realize the format parameter automatically identifying I2S.As shown in Figure 3, concrete implementation procedure is as follows:
SA11. detect FSY pin and whether produce rising edge, if so, perform next step operation, otherwise circulation performs this step.
SA12. detect FSY pin and whether produce negative edge, if so, add up in the time cycle of FSY pin rising edge and negative edge, SCK produces the times N of rising edge, thus obtains bit clock speed and export recognition result, otherwise performs next step operation.
SA13. detect and produce in the time interval of rising edge for 18th ~ 25 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 16 bits and returns step SA12, otherwise performs next step operation.
SA14. detect and produce in the time interval of rising edge for 26th ~ 33 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 24 bits and returns step SA12, otherwise sampling resolution is continuous print and returns step SA12.
Finally, the selection of optical fiber synchronization zone passage is carried out.Configuration optical fiber synchronization zone passage, can realize the route of different voice-grade channel on optical fiber.The bandwidth of synchronization zone is 24 ~ 60byte, then the value of network channel is 0 ~ 11.Every 4 bytes set up a passage (i.e. the socket of MOST network).Be connected with the Path Setup of Streaming Media port (StreamPort) by switching different passages, thus make the sound signal of Streaming Media port end input or output MOST network.
In addition, according to actual needs, have a default configuration after system electrification, concrete configuration is as following table.
Table 2 default configuration parameters
As can be seen from Table 2, this is configured to audio frequency and exports, and the data format parameter bit clock speed of I2S and sampling resolution are respectively 128 × Fs and 16 bits, and network channel is value is 0.
MOST network is set up to input or output with audio frequency input/output module and is connected, and particular flow sheet as shown in Figure 4.
S2. when pressing beginning button, the initialization of MOST controller.
S3. determine whether audio frequency input pattern, if so, perform step S3, otherwise perform step S5.
S4. to MOST network host node registration AuxIn functional block.
S5. set up audio frequency input to connect, and perform step S8.
S6. to MOST network host node registration AudioAmplifier functional block.
S7. set up audio frequency and export connection, and perform step S8.
Wherein, AuxIn functional block and AudioAmplifier functional block are the common segment in MOST agreement.
In step S5 and step S7, as shown in Figure 5, detailed process is as follows for the particular flow sheet connected according to relevant configuration:
SS01. Streaming Media port is opened.
SS02. network channel is set up.
SS03. Streaming Media passage is set up.
SS04. two interchannel connections are set up.
In the connection of S8. setting up in previous step, the signal carried out between MOST network with audio frequency input/output module communicates.
When being now audio frequency input pattern, setting up after between MOST network with audio frequency input/output module, audio frequency input is connected, when input source of sound has sound signal to come in, automatically identify by the I2S signal format of the process flow diagram shown in Fig. 3 to source of sound input signal, after being decoded by ADC, be sent to MOST network.
When being now audio output mode, setting up after audio frequency between MOST network with audio frequency input/output module exports and be connected, when MOST network has signal to come in, by the I2S signal format set by keyboard input module, after being decoded by DAC, be sent to external unit.
In signal communication process between MOST network and audio frequency input/output module, INIC chip by output frame clock and bit clock two I2S clock signals to the decoding chip of described audio frequency input/output module, ADC and DAC chip, in order to isochronous audio signal, make the input and output signal of integrated I2S simultaneously on an INIC chip.
It should be noted that, in the present embodiment, the form of I/O source of sound is I2S form.
The above is better embodiment of the present invention, not does any pro forma restriction to the present invention.It should be noted that; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (10)
1. the universal onboard audio development platform based on MOST network, comprise MOST network (1), MCU module (2), display module (3) and audio frequency input/output module (4), it is characterized in that: also comprise the interface module (5) be connected with described MOST network (1), MCU module (2) and audio frequency input/output module (4) respectively, the keyboard input module (6) be electrically connected with described MCU module (2); Described interface module (5) comprises the MOST control module (51) be connected by I2C mode with described MCU module (2); Described audio frequency input/output module (4) is connected with MOST controller (51), and described display module (3) is electrically connected with MCU module (2); Be provided with in described MOST controller (51) to realize the functional block of audio frequency output and the functional block in order to realize audio frequency input.
2. the universal onboard audio development platform based on MOST network according to claim 1, it is characterized in that, INIC chip and photoelectric commutator is provided with in described MOST controller (51), wherein INIC chip is electrically connected with described audio frequency input/output module, and photoelectric commutator is arranged between INIC chip and MOST network.
3. the universal onboard audio development platform based on MOST network according to claim 2, is characterized in that, the model of described INIC chip is OS81050 or OS81060.
4., based on a universal onboard audio input output method for MOST network, it is characterized in that: described method comprises:
S1.MOST network is set up to input or output with audio frequency input/output module and is connected;
In the connection of S2. setting up in step S1, the signal carried out between MOST network with audio frequency input/output module communicates.
5. the universal onboard audio input output method based on MOST network according to claim 3, it is characterized in that, described step S1 comprises the steps:
The initialization of S101.MOST controller;
S102. determine whether audio frequency input pattern, if so, perform step S3, otherwise perform step S5;
S103. to MOST network host node registration AuxIn functional block;
S104. according to relevant configuration, set up audio frequency input and connect, terminate Connection Step;
S105. to MOST network host node registration AudioAmplifier functional block;
S106. according to relevant configuration, set up audio frequency and export connection, terminate Connection Step.
6. wherein, AuxIn functional block and AudioAmplifier functional block are that MOST cooperates the general purpose function block specified in tissue.
7. the universal onboard audio input output method based on MOST network according to any one of claim 4 or 5, is characterized in that: described method also comprised before step S1:
SA. audio configuration setting is carried out by keyboard input module or automatic identification module;
Universal onboard audio input output method based on MOST network according to claim 6, is characterized in that: described audio configuration arranges and comprises audio frequency I/O pattern, the I2S signal format of output and optical fiber synchronization zone passage.
8. the universal onboard audio input output method based on MOST network according to claim 6, is characterized in that: described step SA comprises the steps:
SA01. the transmission direction of audio frequency is selected as required;
If be SA02. audio frequency input, enter audio frequency automatic identification model, the input key that audio format is selected lost efficacy; If audio frequency exports, then enter audio format preference pattern, by input key, audio format is selected.
9. the universal onboard audio input output method based on MOST network according to claim 7, is characterized in that: the signal format of described I2S is determined by bit clock speed and sampling resolution.
10. the universal onboard audio input output method based on MOST network according to claim 7, is characterized in that: the automatic identification model step of described audio format is as follows:
SA11. detect FSY pin and whether produce rising edge, if so, perform next step operation, otherwise circulation performs this step;
SA12. detect FSY pin and whether produce negative edge, if so, add up in the time cycle of FSY pin rising edge and negative edge, SCK produces the times N of rising edge, thus obtains bit clock speed and export recognition result, otherwise performs next step operation;
SA13. detect and produce in the time interval of rising edge for 18th ~ 25 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 16 bits and returns step SA12, otherwise performs next step operation;
SA14. detect and produce in the time interval of rising edge for 26th ~ 33 times at SCK pin, DATA pin has unchanged, if unchanged, sampling resolution is 24 bits and returns step SA12, otherwise sampling resolution is continuous print and returns step SA12.
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