CN210112260U - Active sound box based on A2B bus - Google Patents

Abstract

The utility model provides an active audio amplifier based on A2B bus, include: A2B transceiver module, amplifier module, connector and speaker. The A2B transceiver module is in signal connection with the amplifier module, the A2B transceiver module is in signal connection with the connector, and the output end of the amplifier module is connected with the loudspeaker. The A2B transceiver module is mounted on the A2B bus through a connector and performs data interaction with the A2B bus, the A2B transceiver module sends a received control signal to the amplification module through the I2C bus, and/or the A2B transceiver module transmits received audio data to the amplification module through the TDM/I2S bus. And the amplifying module amplifies the audio data after performing digital-to-analog conversion, and controls the loudspeaker to play the audio data according to the control signal. The utility model discloses can change the channel number of output audio frequency in a flexible way, reduce equipment development and use cost.

Description

Active sound box based on A2B bus

Technical Field

The utility model relates to a power amplifier stereo set field especially relates to an active audio amplifier based on A2B bus.

Background

In the present day, no matter in automobiles or households, or in movie theaters or stages, people have higher and higher requirements on the playing effect of sound systems used in the places, and different consumer groups, different sound effect pursuits and different application scenes have different requirements on the configuration of the sound systems. Often need arrange a plurality of audio amplifier or speaker in different positions, make the audio cable overall arrangement in whole place complicated, easily cause equipment cost height, the security is low.

Most of the existing active sound boxes are accessed by analog signals, and carry out sound effect processing on the original analog signals through an AD sampling circuit, a sound effect processing module and an amplifying circuit which are arranged on the existing active sound boxes, and drive a loudspeaker to play sound. Taking a commonly used stereo sound box as an example, most of the stereo sound boxes are divided into a main sound box and an auxiliary sound box, wherein the main sound box is responsible for signal processing and signal amplification, and finally, the auxiliary sound box only outputs amplified audio. In addition, the vehicle-mounted sound equipment or the home theater sound equipment is generally matched with a power amplifier module, the power amplifier is used for centralized processing of input audio, and finally, the audio is distributed to different loudspeakers through sound channel expansion. The existing active sound box embeds the power amplifier circuit in the sound box, and the number of output channels of the active sound box is already defined at the beginning of product design, which is not beneficial to increase or delete, and is not convenient for the construction and optimization of the sound field. Even in passive sound systems with external power amplifier circuits, such as those in vehicle-mounted or home theaters, it is very inconvenient if the number of speakers is to be expanded, and manufacturers are required to make corresponding redundant designs at the beginning of product design, which increases the design cost. For example, if the vehicle-mounted vehicle machine platform has only 4 paths of outputs, it is difficult to increase subwoofers, otherwise, the audio circuit needs to be changed greatly, which causes the circuit to be particularly complex and increases the cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides an active audio amplifier based on A2B bus solves current active audio amplifier output channel figure limited, and the sound field's of being not convenient for construction and optimization easily cause the problem that the audio cable overall arrangement is complicated, equipment cost is high, can change the channel number of output audio frequency in a flexible way, reduces equipment development and use cost.

In order to achieve the above purpose, the utility model provides the following technical scheme:

an active speaker based on an A2B bus, comprising: A2B transceiver module, amplifier module, connector and loudspeaker;

the A2B transceiver module is in signal connection with the amplification module, the A2B transceiver module is in signal connection with the connector, and the output end of the amplification module is connected with the loudspeaker;

the A2B transceiver module is mounted on an A2B bus through the connector and performs data interaction with an A2B bus, the A2B transceiver module receives control signals and/or audio data, the A2B transceiver module sends the control signals to the amplification module through an I2C bus, and the A2B transceiver module transmits the audio data to the amplification module through a TDM/I2S bus;

and the amplifying module amplifies the audio data after performing digital-to-analog conversion, and controls the loudspeaker to play the audio data according to the control signal.

Preferably, the A2B transceiver module is provided with a phantom power output end, the phantom power output end is electrically connected with a power supply end of the amplifier module, and the A2B transceiver module supplies power to the amplifier module in a phantom mode through the phantom power output end.

Preferably, the connector is A2-pin plug, and the connector performs bidirectional data connection with the A2B transceiver module through an unshielded twisted pair.

Preferably, the A2B transceiver module includes: a first A2B chip, TDM port, and I2S port;

the first A2B chip is in signal connection with the TDM port and the I2S port, respectively, and the first A2B chip sends the audio data to the amplification module through the TDM port or the I2S port.

Preferably, the A2B transceiver module is an A2B transceiver.

Preferably, the amplifying module includes: the digital-to-analog conversion unit is used for converting the analog signal into the digital signal;

the D/A digital-to-analog conversion unit is used for performing digital-to-analog conversion on the audio data to obtain an analog signal;

the power amplifying unit is used for amplifying the analog signal output by the D/A digital-to-analog conversion unit.

Preferably, the method further comprises the following steps: A2B master node module;

a plurality of the A2B transceiver modules are mounted on an A2B bus, and each of the A2B transceiver modules forms an A2B slave node with the corresponding amplifying module, connector and speaker;

the A2B master node module is connected to the A2B bus and serves as A2B master node, and the A2B master node module is further configured to send the audio data to the A2B bus, so that each A2B transceiver module mounted on the A2B bus acquires the audio data in real time, thereby forming a data interaction network between the A2B master node and a plurality of A2B slave nodes.

Preferably, the A2B master node module includes: a second A2B chip, a power input port, and a data output port;

the second A2B chip is connected to the power input port and the data output port, respectively, an external power source supplies power to the second A2B chip through the power input port, and the second A2B chip transmits the audio data to the A2B bus through the data output port.

Preferably, the method further comprises the following steps: a sound effect processing module;

the sound effect processing module is in signal connection with the A2B main node module and is used for carrying out sound effect processing on an externally input audio signal and sending the processed audio signal to the A2B main node module.

Preferably, the sound effect processing module includes: the analog input interface, the A/D analog-to-digital conversion unit and the DSP processor are connected with the analog input interface;

the input end of the A/D analog-to-digital conversion unit is connected with the analog input port, and the output end of the A/D analog-to-digital conversion unit is connected with the input end of the DSP processor;

and the DSP processor receives an audio signal input from the outside through the analog input interface and processes the audio signal according to a preset sound effect algorithm to form the audio data.

The utility model provides an active audio amplifier based on A2B bus receives control signal and audio data in A2B bus through A2B transceiver module to send audio data to amplify for the module of enlargiing through TDM I2S bus by A2B transceiver module, and then play through the speaker. The problems that the number of output channels of the existing active sound box is limited, the sound field is inconvenient to build and optimize, the layout of an audio cable is complex, and the equipment cost is high are solved, the number of channels for outputting audio can be flexibly changed, and the equipment development and use cost is reduced.

Drawings

In order to more clearly illustrate the specific embodiments of the present invention, the drawings used in the embodiments will be briefly described below.

Fig. 1 is a schematic view of an active speaker based on an A2B bus according to the present invention;

fig. 2 is a schematic view of another active speaker based on A2B bus according to the present invention;

fig. 3 is a schematic view of a sound box system with multiple audio outputs according to an embodiment of the present invention.

Reference numerals

11A2B transceiver module

12 amplifying module

13 speaker

14 connector

15A 2B master node module

16 sound effect processing module

Detailed Description

In order to make those skilled in the art better understand the solution of the embodiments of the present invention, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and the implementation manner.

The active sound box has no expandability aiming at the current, the number of channels is determined at the beginning of design, a user needs to research and develop and design aiming at different requirements in the using process, and meanwhile, the complexity of audio cable layout is easily caused by a plurality of sound boxes, and the equipment cost is improved. The utility model provides an active audio amplifier based on A2B bus receives control signal and audio data in A2B bus through A2B transceiver module to send audio data to amplify for the module of enlargiing through TDM I2S bus by A2B transceiver module, and then play through the speaker. The problems that the number of output channels of the existing active sound box is limited, the sound field is inconvenient to build and optimize, the layout of an audio cable is complex, and the equipment cost is high are solved, the number of channels for outputting audio can be flexibly changed, and the equipment development and use cost is reduced.

As shown in fig. 1, an active speaker based on A2B bus includes: A2B transceiver module 11, amplification module 12, connector 14 and speaker 13. The A2B transceiver module 11 is in signal connection with the amplifier module 12, the A2B transceiver module 11 is in signal connection with the connector 14, and the output end of the amplifier module 12 is connected with the loudspeaker 13. The A2B transceiver module 11 is mounted on the A2B bus through the connector 14 and performs data interaction with the A2B bus, when the A2B transceiver module 11 receives a control signal and/or audio data, the A2B transceiver module 11 sends the control signal to the amplifier module 12 through the I2C bus, and the A2B transceiver module transmits the audio data to the amplifier module 12 through the TDM/I2S bus. The amplifying module 12 performs digital-to-analog conversion on the audio data, amplifies the audio data, and controls the speaker 13 to play the audio data according to the control signal.

Specifically, the active speaker implementation structure based on A2B mainly includes a box body, a connector, an A2B folding and unfolding module, an amplification module, and a speaker, where the connector is used to connect with an external A2B bus to provide current, audio data, and control signals. The A2B transceiver module is the key part of the sound box for data transmission with the A2B bus, and is directly connected with the connector and the amplifying module. Some control signals received by the A2B transceiver module may be sent to the amplification module via the I2C data format, and some audio signals may be sent to the amplification module via the TDM/I2S data format. After receiving the audio data, the amplification module performs analog-to-digital conversion, then performs power amplification, and finally outputs the amplified audio signal to a loudspeaker. The A2B transceiver module receives the control signal and the audio data from the A2B bus, so that the layout complexity of the audio cable can be reduced, the number of output audio can be flexibly changed, the audio cable is suitable for different sound field constructions, and the development and use cost of equipment can be reduced.

Further, the A2B transceiver module is provided with a phantom power output end, the phantom power output end is electrically connected with a power supply end of the amplifier module, and the A2B transceiver module supplies power to the amplifier module in a phantom manner through the phantom power output end.

The connector is A2-pin plug-in unit, and the connector is in bidirectional data connection with the A2B transceiver module through an unshielded twisted pair.

In practical application, the A2B transceiver module communicates with the bus data through a connector, and the connector requires uniform models, so that the subsequent expansion of the number of audio nodes is facilitated, the number of sound boxes can be increased at will, and the number of output audio channels is increased by combining with a corresponding software algorithm, so that a certain sound field effect can be formed. Therefore, the connector model must be uniform throughout the audio link. Even, in order to improve the compatibility between different sound box manufacturers, as long as the sound box connectors produced by each manufacturer are consistent in standard, the sound boxes produced by different manufacturers can be completely used in the whole audio link, so that the convenience for building the whole sound system is greatly improved. For example, the subwoofer of the manufacturer a needs to be used in the sound system, but the high-pitch unit of the manufacturer B has better sound quality, and the middle-pitch unit of the manufacturer C has advantages, so that when the whole sound system is constructed, as long as A, B, C sound box connectors produced by three manufacturers are consistent, a set of sound system with higher cost performance can be completely constructed by using three different products.

Further, the A2B transceiver module includes: a first A2B chip, TDM ports, and I2S ports. The first A2B chip is in signal connection with the TDM port and the I2S port, respectively, and the first A2B chip sends the audio data to the amplification module through the TDM port or the I2S port.

Specifically, the A2B transceiver module is equivalent to an audio slave node in the whole A2B audio link, the audio slave node is mainly used for receiving audio data and configuration information in the audio link, the node is provided with a first A2B chip and used for data interaction with the A2B bus, and is mainly responsible for reading the audio data sent by the audio master node from the A2B bus, and it should be noted that the audio master node is mainly used for sending the audio data and the configuration information (control signals) in the audio link. The first A2B chip and the A2B bus can realize bidirectional data connection only through a pair of unshielded twisted pair wires, relevant audio data and some configuration information are obtained from the A2B bus, and meanwhile, the audio slave node can also upload the diagnostic information of the node to the bus in real time. If the node receives some control data, the first A2B chip will send the configuration unit at the associated address in the I2C protocol. If the node receives audio data, the first A2B chip will send out in TDM \ I2S data form. The first A2B chip is an A2B slave chip.

In practical applications, the A2B transceiver module may be an A2B transceiver. ADI adopts chips of AD2427W model and AD2426W model to form an A2B transceiver series, which can be used as an A2B transceiver module.

The amplification module includes: a digital-to-analog conversion unit (D/A digital-to-analog conversion unit) and a power amplification unit. The D/A digital-to-analog conversion unit is used for performing digital-to-analog conversion on the audio data to obtain an analog signal, wherein the D/A digital-to-analog conversion unit can adopt a DAC chip. The power amplifying unit is used for amplifying the analog signal output by the D/A digital-to-analog conversion unit, wherein the power amplifying unit can be realized by adopting a power amplifying circuit.

Meanwhile, the amplifying module is a driving module of the loudspeaker, and when the system is initialized, the amplifying module receives a configuration signal sent by the A2B chip and performs related parameter configuration. After initialization is complete, the module analog-to-digital converts the digital audio data from the A2B chip to an analog signal and amplifies it to drive the speaker.

In another embodiment, as shown in fig. 2 and 3, an active speaker based on A2B bus further includes: A2B master node module 15. A plurality of the A2B transceiver modules 11 are mounted on the A2B bus, and each A2B transceiver module 11 forms an A2B slave node with the corresponding amplification module 12, connector 14, and speaker 13. The A2B master node module 15 is connected to the A2B bus and serves as A2B master node, and the A2B master node module 15 is further configured to send the audio data to the A2B bus, so that each A2B transceiver module mounted on the A2B bus obtains the audio data in real time, so as to form a data interaction network between the A2B master node and a plurality of A2B slave nodes.

Specifically, the A2B bus can transmit not only audio signals but also control signals, so that a data transmission network formed by daisy-chaining A2B chips can be realized, and the data transmission network is composed of a master node and a plurality of slave nodes. The master node is responsible for sending audio data and related control signals to the A2B bus, the slave node can read data from the A2B bus, and meanwhile, the slave node can also send some state information to the bus to be read by the master node, such as diagnostic information. Therefore, a plurality of A2B transceiver modules are mounted on the A2B bus to form a plurality of A2B slave nodes, and the A2B master node module is used as an A2B master node to realize an interactive network of audio data. Can use in various sound fields, like family's sound system, cinema sound system, the higher power that stage sound system required even, further, the audio amplifier that this scheme of use proposed, it also can realize completely to build on-vehicle sound system, consequently, this scheme can reach the purpose of saving the cost, the extension of being convenient for.

Further, the A2B master node module includes: a second A2B chip, a power input port, and a data output port. The second A2B chip is connected to the power input port and the data output port, respectively, an external power source supplies power to the second A2B chip through the power input port, and the second A2B chip transmits the audio data to the A2B bus through the data output port.

As shown in fig. 2, the sound box further includes: a sound effect processing module 16. The sound effect processing module 16 is in signal connection with the A2B main node module 15, and is configured to perform sound effect processing on an externally input audio signal, and send the processed audio signal to the A2B main node module.

From the above, the active speaker of this scheme is similar to the traditional active speaker, also needs signal processing module and amplification module, but changes the mode that signal processing module was from the embedded audio amplifier to external mode, and original amplification module still remains in the audio amplifier, all has independent amplification module in every A2B audio amplifier, connects through A2B bus between signal processing module and the amplification module (A2B audio amplifier). Thus, the number of channels for outputting audio can be flexibly changed, and the development period and the development cost can be shortened.

Further, the sound effect processing module comprises: the device comprises an analog input interface, an analog-to-digital conversion unit (A/D analog-to-digital conversion unit) and a DSP processor. The input end of the A/D analog-to-digital conversion unit is connected with the analog input port, and the output end of the A/D analog-to-digital conversion unit is connected with the input end of the DSP processor. And the DSP processor receives an audio signal input from the outside through the analog input interface and processes the audio signal according to a preset sound effect algorithm to form the audio data.

As shown in fig. 3, the application system module is designed based on the new type A2B active speaker in the present scheme. The whole system needs a sound effect processing platform, which is usually a DSP (digital signal processor), all sound effect algorithms are operated on the platform, the processed audio data are sent to an A2B main node in a data transmission network consisting of an A2B bus in a TDM (time division multiplexing) mode, the A2B main node is responsible for sending the audio data to the A2B bus, and each A2B slave node mounted on the A2B bus can read the audio data from the A2B bus in real time. Each loudspeaker in the A2B slave node is completely identical from the perspective of software and hardware, unlike the traditional active loudspeaker, the main and auxiliary loudspeakers are separately developed, and most of them do not support the sound channel expansion, and even if the sound channel expansion is supported, the development cost is relatively large. In the scheme, due to the consistency of A2B sound boxes in the slave nodes, great convenience is brought to the expandability of the system. For example, the low-end product is a two-channel sound system, so that in the whole product development, only a corresponding stereo algorithm needs to be carried on the sound effect algorithm processing platform, and the stereo sound effect can be realized by mounting two slave nodes; the middle-end product needs to realize the primary surround feeling of 5 sound channels, so that a hardware system of the primary product does not need to be changed, and the method can be realized only by adding 3 sound boxes on an A2B bus of the primary product and carrying a primary surround sound effect algorithm on a sound effect algorithm platform; similarly, high-end products only need to output 2 channels of sound boxes on the basis of middle-end products, and meanwhile, a high-end surround sound effect algorithm is carried, so that higher-end surround sound effects can be achieved. Thereby saving the period and difficulty of manufacturers for developing products, saving resources, facilitating matching and expanding.

It is visible, the utility model provides an active audio amplifier based on A2B bus receives control signal and audio data in A2B bus through A2B transceiver module to send audio data to amplify for amplifier module through TDM I2S bus by A2B transceiver module, and then broadcast through the speaker. The problems that the number of output channels of the existing active sound box is limited, the sound field is inconvenient to build and optimize, the layout of an audio cable is complex, and the equipment cost is high are solved, the number of channels for outputting audio can be flexibly changed, and the equipment development and use cost is reduced.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims (10)

1. An active audio amplifier based on A2B bus, characterized by comprising: A2B transceiver module, amplifier module, connector and loudspeaker;

the A2B transceiver module is in signal connection with the amplification module, the A2B transceiver module is in signal connection with the connector, and the output end of the amplification module is connected with the loudspeaker;

the A2B transceiver module is mounted on an A2B bus through the connector and performs data interaction with an A2B bus, the A2B transceiver module receives control signals and/or audio data, the A2B transceiver module sends the control signals to the amplification module through an I2C bus, and the A2B transceiver module transmits the audio data to the amplification module through a TDM/I2S bus;

and the amplifying module amplifies the audio data after performing digital-to-analog conversion, and controls the loudspeaker to play the audio data according to the control signal.

2. The A2B bus-based active speaker of claim 1, wherein the A2B transceiver module is provided with a phantom power output, the phantom power output is electrically connected to the power supply terminal of the amplifier module, and the A2B transceiver module performs phantom power supply to the amplifier module through the phantom power output.

3. The A2B bus-based active speaker of claim 2, wherein the connector is A2-pin plug, and the connector is in bidirectional data connection with the A2B transceiver module via unshielded twisted pair wires.

4. The A2B bus-based active speaker of claim 3, wherein the A2B transceiver module comprises: a first A2B chip, TDM port, and I2S port;

the first A2B chip is in signal connection with the TDM port and the I2S port, respectively, and the first A2B chip sends the audio data to the amplification module through the TDM port or the I2S port.

5. The A2B bus-based active speaker of claim 4, wherein the A2B transceiver module is an A2B transceiver.

6. The A2B bus-based active speaker of claim 5, wherein the amplification module comprises: the digital-to-analog conversion unit and the power amplification unit;

the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the audio data to obtain an analog signal;

the power amplifying unit is used for amplifying the analog signal output by the digital-to-analog conversion unit.

7. The A2B bus-based active speaker of claim 6, further comprising: A2B master node module;

a plurality of the A2B transceiver modules are mounted on an A2B bus, and each of the A2B transceiver modules forms an A2B slave node with the corresponding amplifying module, connector and speaker;

the A2B master node module is connected to the A2B bus and serves as A2B master node, and the A2B master node module is further configured to send the audio data to the A2B bus, so that each A2B transceiver module mounted on the A2B bus acquires the audio data in real time, thereby forming a data interaction network between the A2B master node and a plurality of A2B slave nodes.

8. The A2B bus-based active speaker of claim 7, wherein the A2B master node module comprises: a second A2B chip, a power input port, and a data output port;

the second A2B chip is connected to the power input port and the data output port, respectively, an external power source supplies power to the second A2B chip through the power input port, and the second A2B chip transmits the audio data to the A2B bus through the data output port.

9. The active speaker based on A2B bus of claim 8, further comprising: a sound effect processing module;

the sound effect processing module is in signal connection with the A2B main node module and is used for carrying out sound effect processing on an externally input audio signal and sending the processed audio signal to the A2B main node module.

10. The A2B bus-based active speaker box according to claim 9, wherein the sound effect processing module comprises: the device comprises an analog input interface, an analog-to-digital conversion unit and a DSP (digital signal processor);

the input end of the analog-to-digital conversion unit is connected with the analog input port, and the output end of the analog-to-digital conversion unit is connected with the input end of the DSP processor;

and the DSP processor receives an audio signal input from the outside through the analog input interface and processes the audio signal according to a preset sound effect algorithm to form the audio data.

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