CN210403208U - Audio conversion device - Google Patents
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- CN210403208U CN210403208U CN201921373251.9U CN201921373251U CN210403208U CN 210403208 U CN210403208 U CN 210403208U CN 201921373251 U CN201921373251 U CN 201921373251U CN 210403208 U CN210403208 U CN 210403208U
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Abstract
The utility model discloses an audio conversion equipment, include: the system comprises a power distribution module, a signal processing module, an input module, a control module and an automobile audio bus module, wherein the input module, the control module and the automobile audio bus module are respectively connected with the signal processing module; the automobile audio bus module is provided with a first interface and a second interface which are used for connecting peripheral equipment, the automobile audio bus module is configured as a main device, and the peripheral equipment at the lower level is connected with the first interface; the automobile audio bus module is configured as a slave device, and the superior peripheral is connected with the first interface or the second interface; the power distribution module is used for supplying power to the signal processing module, the control module, the input module and the automobile audio bus module. The utility model discloses a product with A2B interface provides the A2B audio signal of standard, still possesses extensive expansibility simultaneously, can cascade the use with current audio conversion product.
Description
Technical Field
The utility model relates to an audio frequency product field especially relates to an audio frequency conversion equipment.
Background
Common audio converter in the market at present, the interconversion between traditional audio format such as 3.5mm earphone interface, R/L lotus flower head, coaxial/optic fibre, or increase HDMI input conversion on above-mentioned basis and become all the other four kinds of modes etc. for example retrieve with the utility model discloses the closest prior art CN208336669U, a stereo audio converter, this scheme has realized that coaxial input, optic fibre input convert the function of simulating 3.5mm earphone interface, R/L left and right channels lotus flower head output, and this converter scheme has HDMI output interface simultaneously. But with A2B technique (for convenience of description, the utility model uses "A2B" to indicate A2B) The proportion in the automobile infotainment experience is increased, more and more vehicle-mounted electronic products are integrated with an A2B bus interface, however, no product mainly used for A2B audio signal conversion exists in the prior art.
The utility model provides an audio frequency conversion equipment mainly focuses on A2B interface product, and A2B is one kind by the ADI company release provides high fidelity stereo set for the car to can realize the car digital audio bus technique of theoretical 50Mbps bandwidth and two-way transmission up to 32 passageways, it is not only the performance excellent, and the circuit simplification is showing and software design is more simple moreover. The A2B bus is typically daisy chained in series to multiple remote sensors for different applications, greatly reducing redundant cables, while also providing power to other devices in the daisy chain, thereby eliminating the need for a local power supply, further reducing the overall system cost, not only helping to bring a better design experience, but also helping to achieve a more excellent, more environmentally friendly, and more robust automotive application experience.
As mentioned above, the current A2B bus technology has become a bus technology dedicated to providing key support for vehicle infotainment systems, and has a large share in the field of car audio, but the prior art solution is not applicable to products with A2B interface.
SUMMERY OF THE UTILITY MODEL
Based on the above needs, the utility model aims at providing an audio conversion equipment, compatible mainstream audio formats such as A2B use experience for the user provides the audio of pluralism.
The utility model adopts the technical scheme as follows:
an audio conversion device comprising: the system comprises a power distribution module, a signal processing module, an input module, a control module and an automobile audio bus module, wherein the input module, the control module and the automobile audio bus module are respectively connected with the signal processing module;
the automobile audio bus module is provided with a first interface and a second interface which are used for connecting peripheral equipment, the automobile audio bus module is configured as a master device, and the lower peripheral equipment is connected with the first interface; the automobile audio bus module is configured as a slave device, and an upper peripheral is connected with the first interface or the second interface;
the power distribution module is used for supplying power to the signal processing module, the control module, the input module and the automobile audio bus module.
Optionally, the device further includes an SPDIF interface connected to the signal processing module and configured to connect to a peripheral device.
Optionally, a single-ended to differential module is disposed between the signal processing module and the SPDIF interface.
Optionally, the device further includes a debugging interface connected to the signal processing module and the control module, respectively.
Optionally, the input module is a photoelectric conversion module, and the photoelectric conversion module has an optical fiber interface for connecting an external optical fiber.
Optionally, the power distribution module supplies power to each module through an external power supply and/or a built-in battery.
Optionally, the power distribution module that supplies power to each module through an external power supply specifically includes:
the low-dropout voltage regulator comprises an external power interface, a first group of low-dropout linear voltage regulator modules, a DCDC module and a second group of low-dropout linear voltage regulator modules;
the external power supply interface is respectively connected with the first group of low-dropout linear voltage stabilizing modules and the DCDC module, and the DCDC module is also connected with the second group of low-dropout linear voltage stabilizing modules;
the first group of low-voltage-difference linear voltage stabilizing modules are used for independently supplying power to the automobile audio bus module;
the second group of low-voltage-difference linear voltage stabilizing modules adopt a parallel structure of a plurality of low-voltage-difference linear voltage stabilizing modules and are used for respectively supplying power to the signal processing module, the control module and the input module.
Optionally, the power distribution module that supplies power to each module through a built-in battery specifically includes a first group of low-dropout linear voltage regulator modules and a second group of low-dropout linear voltage regulator modules;
and, the device further comprises two sets of batteries:
the first group of low-dropout linear voltage stabilizing modules are used for independently supplying power to the automobile audio bus module;
the other group of batteries is connected with the second group of low-dropout linear voltage stabilizing modules, and the second group of low-dropout linear voltage stabilizing modules adopt a parallel connection structure of a plurality of low-dropout linear voltage stabilizing modules and are used for respectively supplying power to the signal processing module, the control module and the input module.
Optionally, the device further comprises a switch connected with the two groups of batteries for triggering the circuit to be switched on and off.
Optionally, the apparatus further comprises a containment box;
the power distribution module, the signal processing module, the input module, the control module and the automobile audio bus module are integrated on a circuit board, the circuit board is installed in the containing box, and holes corresponding to the interfaces of the modules are formed in the containing box.
The utility model discloses mainly based on the demand of A2B audio products, provide an audio frequency conversion equipment scheme, it can realize the conversion between multiple audio format and the A2B format, and aim at still possesses extensive expansibility for the A2B audio signal that the product that has the A2B interface provides the standard simultaneously, can cascade the use with current audio frequency conversion product. Compared with the prior art, the utility model discloses a conversion between A2B signal and other audio signal is applicable to the product that possesses the A2B interface to the interface is simple, convenient to use, and then can the wide application in test, the tuning of products such as car machine, noise reduction module, power amplifier, solves present A2B product test, adjusts inconvenient problem.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a schematic block diagram of an embodiment of an audio conversion apparatus provided by the present invention;
fig. 2 is a block diagram of an audio conversion apparatus according to a preferred embodiment of the present invention;
FIG. 3 is a block diagram of an integrated embodiment of an audio conversion device provided by the present invention;
fig. 4 is a schematic structural diagram of an embodiment of an audio conversion apparatus provided by the present invention.
Description of reference numerals:
1 signal processing module, 2 power distribution module, 3 input module and 4 control module
5 first interface 52 and second interface 31 optical fiber interface of automobile audio bus module 51
6 SPDIF interface 7 single-end-to-differential module J debugging interface 21 external power interface
22 first group of low-dropout linear voltage stabilizing modules 23 DCDC module 8 containing box
24 second group of low-dropout linear voltage stabilizing modules B1, battery B2, battery K1 switches
K2 switch
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
The utility model provides an embodiment of audio conversion equipment, three points need to explain earlier here: firstly, the audio conversion device provided by the utility model aims at providing the audio conversion function based on the A2B audio product requirement, so that the problem of audio signal noise interference is not concerned; secondly, the concept of the present invention is digital audio signal processing + A2B conversion, but it does not exclude that the conversion between multiple audio formats (including A2B) is realized by the signal processing technology itself, for example, the conversion from SPDIF to A2B, from A2B to A2B, from optical fiber to A2B, from optical fiber to SPDIF, from analog to A2B, from analog to SPDIF, and the transmission form may also include difference, optical fiber, coaxial, etc., which will be described in detail later.
The embodiment of the audio conversion device shown in fig. 1 mainly comprises: signal processing module 1, distribution module 2 and respectively with input module 3, control module 4 and car audio frequency bus module 5 that signal processing module 1 is connected, wherein, control module 4 still with car audio frequency bus module 5 is connected. The car audio bus module 5 may be an existing A2B module, such as AD24XX series by ADI corporation, etc., the car audio bus module 5 has a first interface 51 and a second interface 52 for connecting peripherals in consideration of a cascade application, for example, from A2B to A2B, and particularly, when the car audio bus module 5 of the present apparatus is configured as a master device, a lower peripheral can be connected with the first interface 51; when the car audio bus module 5 is configured as a slave device, a superior peripheral may be connected to the first interface 51 or the second interface 52.
Continuing above, the power distribution module 2 is used for supplying power to the signal processing module 1, the control module 4, the input module 3 and the car audio bus module 5.
The signal processing module 1 can generally select a DSP chip, for example, a Sigma DSP of ADI, which is accompanied by an interface suitable for A2B protocol and S/PDIF protocol (for convenience of text description, the utility model discloses get rid of "/" and express with "SPDIF" in unison), S/PDIF is an abbreviation of SONY/PHILIPS digital audio interface, and the application in the new generation of PCI sound card is comparatively extensive, and it uses lower hardware cost to be able to realize digital signal transmission with high signal-to-noise ratio, for example, more commonly used in audio products such as car machines, power amplifiers, and the like.
Specifically, the DSP chip can have 48 channels, 32bit digital signal input/output, and can support the audio sampling rate of 192KHZ at most, on one hand, the DSP chip can directly output the input signal from the SPDIF pin to the SPDIF interface 6 which can be configured in the device, and on the other hand, the DSP chip can also output the input signal to the SPDIF interface 6 through I2The S/TDM format is transmitted to the A2B module, and the A2B module converts the signal into an A2B signal for transmission. As mentioned above, the A2B module may be a dedicated car audio bus transceiver chip designed by ADI, Inc., and the A2B module may be directly connected to the I of the DSP module2The system comprises an S/TDM interface and can be configured to be in a master/slave mode, a plurality of peripheral devices are cascaded in a daisy chain mode, and other devices in the daisy chain can be powered. In another preferred embodiment, the DSP module may also generate analog audio signals by itself and output through the SPDIF interface or A2B module as described above.
With regard to the input module 3, generally, the external audio input may use an optical fiber or a coaxial cable to transmit signals, where compared to the coaxial cable, the optical signal transmitted by the optical fiber has the advantages of flexible interface, strong interference resistance, and the like. Accordingly, in a preferred embodiment, the input module may adopt an optical-to-electrical conversion module for connecting an SPDIF input optical fiber, that is, an optical fiber interface configured with the audio conversion device may be selected, for example, a hundred million optical PLR135/T series may be selected, where the PLR135/T is a low-power consumption and high-sensitivity optical fiber receiver, and may convert an optical signal transmitted by an optical fiber into an electrical signal, and send the electrical signal into the DSP for processing through the SPDIF pin of the DSP module, which may normally operate in a voltage range of 2.4V to 5.5V and output a compatible TTL level, so that the input module is suitable for being used in a digital optical link and a digital audio interface circuit, and may also be used as a model selection reference standard for other optical-to-electrical conversion modules. Accordingly, in other embodiments, the optical-to-electrical conversion module may be used as the audio output interface, but the optical-to-electrical conversion module is used as the transmitting end, so that the type of the module is different from that of the input module, for example, the output end may be selected from the hundred million optical PLR133/T series. Of course, if a coaxial cable is used for the implementation, the input module and the output interface may refer to physical interfaces of a dedicated coaxial plug. It should also be noted that, according to different requirements, the photoelectric conversion module may not be limited to fiber to SPDIF, and the above is merely an example for implementation.
It should be noted that, in view of the above-mentioned requirement, the SPDIF device does not need to use a coaxial or optical fiber interface, and in some audio products, a differential interface is used. Therefore, in another embodiment of the present invention, as shown in fig. 2, a single-ended to differential module 7 is further connected between the DSP module and the SPDIF interface, for example, a mei xin MAX3485 transceiver may be used to convert the SPDIF signal output by the signal processing module 1 from a single end to a differential signal for output.
The control module 4 may generally be an MCU, and its specific form includes but is not limited to a single chip microcomputer, etc., the MCU is mainly used for program debugging, register parameter configuration and communication configuration with other modules, the MCU and the aforementioned DSP module may communicate with each other through an SPI interface, and the A2B module may communicate with each other through an I interface2And C, communication is carried out. The MCU module may specifically adopt a product based on ARM Cortex-M4F/M0 kernel, for example, FS32K144UFT0VLLT of NXP, which is mainly used for configuration and program debugging of DSP and A2B modules. In terms of program debugging, the device may further include a debugging interface J connected to the signal processing module 1 and the control module 4, respectively, and in actual operation, the related program may be burned into the MCU module through the debugging interface J, and other modules may be debugged through the MCU.
To sum up, the utility model discloses mainly demand based on A2B audio product provides an audio frequency conversion equipment scheme, it can realize the conversion between multiple audio format and the A2B format, SPDIF changes A2B, A2B changes A2B, optic fibre changes A2B, optic fibre changes SPDIF, the simulation changes A2B, the simulation changes SPDIF etc. main aim at provides the A2B audio signal of standard for the product that has the A2B interface, still make it possess extensive expansibility simultaneously, can cascade the use with current audio frequency conversion product. Compared with the prior art, the utility model discloses a conversion between A2B signal and other audio signal is applicable to the product that possesses the A2B interface to the interface is simple, convenient to use, and then can the wide application in test, the tuning of products such as car machine, noise reduction module, power amplifier, solves present A2B product test, adjusts inconvenient problem.
Further, as for the configuration of power supply, referring to fig. 3, the power distribution module 2 may specifically supply power to the above modules in two ways (either independently or jointly used):
(1) an external power supply: the power distribution module 2 comprises an external power interface 21, a first group of low-dropout linear voltage stabilizing modules 22, a DCDC module 23 and a second group of low-dropout linear voltage stabilizing modules 24; the external power interface 21 is respectively connected with the first group of low dropout linear voltage regulator modules 22 and the DCDC module 23, and the DCDC module 23 is further connected with the second group of low dropout linear voltage regulator modules 24; the first group of low-dropout linear voltage regulator modules 22 is used for independently supplying power to the automobile audio bus module 5; the second group of low-dropout linear regulator modules 24 adopts a parallel structure of a plurality of low-dropout linear regulator modules, and is used for respectively supplying power to the signal processing module 1, the control module 4 and the input module 3.
Specifically, an external power source may be connected to the external power interface 21 via a common twisted pair and plug wire terminal to provide DC12V voltage to the device. The first set of low dropout linear regulator modules 22 is an LDO chip, and is configured to convert the input DC12V voltage into DC8V, which is used as the input voltage of the A2B module; the second set of low dropout linear regulator module 24 is composed of two LDO chips, and the DCDC module 23 is configured to convert the input DC12V into 3.7V, further convert the 3.7V into the aforementioned DSP module through the two LDOs in the parallel structure, respectively, and convert the MCU module and the photoelectric conversion module into 3.3V voltage required for normal operation, which can reduce the input/output voltage difference of the LDOs in the parallel structure, and reduce the heat generation of the LDOs.
(2) A built-in battery: the power distribution module 2 specifically includes a first group of low dropout linear regulator modules 22 and a second group of low dropout linear regulator modules 24; the device also comprises two groups of batteries, wherein one group of batteries B1 is connected with the first group of low-dropout linear voltage regulator modules 22, and the first group of low-dropout linear voltage regulator modules 22 are used for independently supplying power to the automobile audio bus module 5; the other battery B2 is connected to the second low dropout linear regulator module 24, and the second low dropout linear regulator module 24 adopts a parallel connection structure of multiple low dropout linear regulator modules, and is used for respectively supplying power to the signal processing module 1, the control module 4, and the input module 3.
Specifically, the low dropout linear regulator (LDO) is configured in a manner similar to the aforementioned power supply embodiment, except that the step-down process via the DCDC module 23 may not be required if a built-in battery power supply is employed. A reference is made here to an embodiment with a built-in battery, it being noted that, taking into account the service time of the device, the battery packs supplying power independently to the A2B module may be implemented in a series configuration, and the battery packs supplying power to other modules may be implemented in a multi-section parallel configuration; here, take five 18650 batteries and the three LDOs as an example:
1. in order to reduce the power consumption of an LDO chip and improve the power supply rejection ratio PSRR of the A2B module, a 18650 battery with three series-connected nodes outputs 8V through an independent LDO, and the output is used as an independent power supply source of the A2B module.
2. The two parallel 18650 batteries are used for providing electric energy input for the two parallel LDO chips, wherein one LDO outputs 3.3V and supplies the electric energy to the DSP module; and the other LDO outputs 3.3V to the MCU and the photoelectric conversion module.
Of course, can also carry out adaptability adjustment, expansion based on above-mentioned (1) (2) two kinds of power distribution tactics, the utility model discloses do not describe to this again. It should be noted that, as shown in fig. 3, regarding the power distribution setting based on the built-in battery, it may also be considered to facilitate start-stop operation and power management, where the device includes a switch K1\ K2 connected to the two groups of batteries and used for triggering on-off of a circuit, and specifically, one switch may be used for unified control, or two switches may be used for independent on-off control corresponding to the two groups of batteries respectively.
Finally, in combination with fig. 4, in order to ensure the electrical safety and the overall operational convenience of the related components in the above embodiment and the preferred solutions thereof, in a preferred embodiment, the audio conversion device further includes a receiving box 8 (the receiving box shown in fig. 4 is in an open state), the power distribution module, the signal processing module, the input module, the control module, and the car audio bus module are integrated on a circuit board, the circuit board is installed in the receiving box 8, and openings corresponding to the interfaces of the modules are formed in the receiving box 8. Specifically, the shape of the accommodating box 8 itself can adopt various existing box structures such as a cuboid, a cube, a cylinder, a round table and the like, and the opening and closing mode of the accommodating box 8 can adopt a door cover type, a lock joint type, a sliding connection type and other structures which are assembled and disassembled by a plurality of shells, or can adopt an integrated door cover plate which can be lifted, turned and rotated, a lock catch and other conventional structures. With reference to the foregoing embodiments, for example, the optical fiber interface 31, the external power interface 21, the SPDIF interface 6, the first interface 51 and the second interface 52 of the A2B module, and the debug interface J are respectively provided with matching openings, but for the embodiment with the switch K1/K2, the opening on the receiving box 8 for installing the switch may also be correspondingly formed. The utility model discloses do not inject each trompil (and corresponding interface) specific position on holding box 8, this can be adjusted according to actual demand is nimble, but can explain (not inject), from physical structure, the interface of above-mentioned SPDIF interface, A2B module all can adopt the USB terminal form, the debugging interface then can adopt Type-C terminal form.
The structure, features and effects of the present invention have been described in detail in the above embodiments shown in the drawings, but the above embodiments are only preferred embodiments of the present invention, and it should be noted that, the technical features related to the above embodiments and their preferred modes can be reasonably combined and assembled into various equivalent schemes by those skilled in the art without departing from or changing the design idea and technical effects of the present invention; therefore, the present invention is not limited to the embodiments shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to equivalent changes are within the scope of the present invention without departing from the spirit of the present invention.
Claims (10)
1. An audio conversion apparatus, comprising: the system comprises a power distribution module, a signal processing module, an input module, a control module and an automobile audio bus module, wherein the input module, the control module and the automobile audio bus module are respectively connected with the signal processing module;
the automobile audio bus module is provided with a first interface and a second interface which are used for connecting peripheral equipment, the automobile audio bus module is configured as a master device, and the lower peripheral equipment is connected with the first interface; the automobile audio bus module is configured as a slave device, and an upper peripheral is connected with the first interface or the second interface;
the power distribution module is used for supplying power to the signal processing module, the control module, the input module and the automobile audio bus module.
2. The audio conversion apparatus according to claim 1, further comprising an SPDIF interface connected to the signal processing block for connecting a peripheral device.
3. The audio conversion apparatus according to claim 2, wherein a single-ended to differential block is provided between the signal processing block and the SPDIF interface.
4. The audio conversion device of claim 1, further comprising a debug interface connected to the signal processing module and the control module, respectively.
5. The audio conversion device according to claim 1, wherein the input module is a photoelectric conversion module having an optical fiber interface for connecting an external optical fiber.
6. The audio conversion device of claim 1, wherein the power distribution module supplies power to each module via an external power source and/or an internal battery.
7. The audio conversion device according to claim 6, wherein the power distribution module for supplying power to each module via an external power supply specifically comprises:
the low-dropout voltage regulator comprises an external power interface, a first group of low-dropout linear voltage regulator modules, a DCDC module and a second group of low-dropout linear voltage regulator modules;
the external power supply interface is respectively connected with the first group of low-dropout linear voltage stabilizing modules and the DCDC module, and the DCDC module is also connected with the second group of low-dropout linear voltage stabilizing modules;
the first group of low-voltage-difference linear voltage stabilizing modules are used for independently supplying power to the automobile audio bus module;
the second group of low-voltage-difference linear voltage stabilizing modules adopt a parallel structure of a plurality of low-voltage-difference linear voltage stabilizing modules and are used for respectively supplying power to the signal processing module, the control module and the input module.
8. The audio conversion device according to claim 6, wherein the power distribution module for supplying power to each module through a built-in battery specifically comprises a first set of low dropout linear regulator modules and a second set of low dropout linear regulator modules;
and, the device further comprises two sets of batteries:
the first group of low-dropout linear voltage stabilizing modules are used for independently supplying power to the automobile audio bus module;
the other group of batteries is connected with the second group of low-dropout linear voltage stabilizing modules, and the second group of low-dropout linear voltage stabilizing modules adopt a parallel connection structure of a plurality of low-dropout linear voltage stabilizing modules and are used for respectively supplying power to the signal processing module, the control module and the input module.
9. The audio conversion device of claim 8, further comprising a switch connected to both sets of batteries for toggling the circuit on and off.
10. The audio conversion apparatus according to any one of claims 1 to 9, further comprising a housing box;
the power distribution module, the signal processing module, the input module, the control module and the automobile audio bus module are integrated on a circuit board, the circuit board is installed in the containing box, and holes corresponding to the interfaces of the modules are formed in the containing box.
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| CN201921373251.9U CN210403208U (en) | 2019-08-22 | 2019-08-22 | Audio conversion device |
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| CN201921373251.9U CN210403208U (en) | 2019-08-22 | 2019-08-22 | Audio conversion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111918213A (en) * | 2020-07-13 | 2020-11-10 | 江苏开沃汽车有限公司 | Intelligent vehicle-mounted interconnection system |
| CN115941566A (en) * | 2021-08-16 | 2023-04-07 | 成都鼎桥通信技术有限公司 | Circuit testing method, testing board and testing system |
-
2019
- 2019-08-22 CN CN201921373251.9U patent/CN210403208U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111918213A (en) * | 2020-07-13 | 2020-11-10 | 江苏开沃汽车有限公司 | Intelligent vehicle-mounted interconnection system |
| CN115941566A (en) * | 2021-08-16 | 2023-04-07 | 成都鼎桥通信技术有限公司 | Circuit testing method, testing board and testing system |
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