A wired differential circuit for connecting a main to a sub active speaker
By using a wired differential circuit to convert signals in parallel, the problem of poor contact and high-purity copper speaker wires in the connection between the main and auxiliary speakers of active speakers was solved, achieving stable signal transmission and internal cavity consistency, and reducing cost and complexity.
Patent Information
- Application Number
- CN202521796680.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-22
AI Technical Summary
In existing technologies, the connection between the main and auxiliary speakers of active speakers requires the use of expensive high-purity copper speaker wires and gold-plated terminals. Furthermore, the connectors are prone to oxidation, leading to poor contact. The internal cavity spaces of the main and auxiliary speakers are inconsistent, resulting in inconsistent audio frequency characteristics.
A wired differential circuit is adopted, which converts the signal into a differential signal through an audio encoder and a control signal encoder. The common-mode noise suppression characteristics of differential transmission are utilized to reduce the impact of electromagnetic interference. A communication link is established through a standardized differential transmission protocol, which simplifies wiring, avoids poor contact of connectors, and keeps the internal cavities of the main and auxiliary boxes consistent.
It reduces manufacturing costs, avoids poor contact, ensures signal transmission stability, and solves the problem of inconsistent audio frequency characteristics between the main and auxiliary boxes.
Smart Images
Figure CN224684344U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of active speaker signal transmission technology, and in particular to a wired differential circuit for connecting main and auxiliary active speakers. Background Technology
[0002] In current technology, the main and auxiliary speakers of active speakers are generally connected via ordinary speaker wires. However, as speaker power increases and the distance between the two speakers grows, expensive high-purity copper speaker wires and gold-plated terminals must be used to reduce power loss. Furthermore, during prolonged use, the connectors will heat up and oxidize due to the continuous flow of high current, leading to poor contact later on. Additionally, since most power amplifier circuitry is integrated into the main speaker, the remaining space inside the main and auxiliary speakers is significantly different, resulting in inconsistent sound frequency characteristics between them. Utility Model Content
[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a wired differential circuit for connecting main and auxiliary active speakers, which eliminates the need for high-purity copper speaker wires and gold-plated terminals, thus reducing manufacturing costs; it also avoids poor contact of the connectors in the later stages of the connection, and solves the problem of inconsistent audio frequency characteristics between the main and auxiliary speakers.
[0004] To achieve the above objectives, a first aspect of this application provides a wired differential circuit for connecting primary and secondary active speakers, comprising: The main chassis differential drive module includes an audio encoder and a control signal encoder. The audio encoder is used to convert the digital audio signal of the main chassis into a differential audio signal, and the control signal encoder is used to convert the serial port control signal of the main chassis into a differential control signal. The main enclosure interface, audio encoder, and control signal encoder are respectively connected to the main enclosure interface circuit. The audio encoder and control signal encoder are connected in parallel. The main enclosure interface is used to send the differential audio signal and differential control signal in the main enclosure to the auxiliary enclosure in differential form. The auxiliary speaker interface is connected to the main speaker interface via a cable. The auxiliary speaker interface is used to receive differential audio signals and differential control signals in the auxiliary speaker. The auxiliary speaker differential input module includes an audio decoder and a control signal decoder. The audio decoder and control signal decoder are respectively connected to the auxiliary speaker interface circuit. The audio decoder and control signal decoder are connected in parallel. The audio decoder is used to decode the differential audio signal to enable the auxiliary speaker to output audio, and the control signal decoder is used to decode the differential control signal to control the auxiliary speaker.
[0005] Furthermore, in some embodiments, the audio encoder includes a first digital audio interface transmitter and a first digital audio interface receiver, the first digital audio interface receiver having a plurality of differential input line receivers built in, and the first digital audio interface transmitter having a differential line driver built in. The first digital audio interface receiver is used to serially receive digital audio signals and convert them into differential audio signals, and the first digital audio interface transmitter is used to output differential audio signals.
[0006] Furthermore, in some embodiments, the audio decoder includes a second digital audio interface transmitter and a second digital audio interface receiver, the second digital audio interface receiver having a plurality of differential input line receivers built in. The second digital audio interface receiver is used to serially receive differential audio signals and convert them into digital audio signals, while the second digital audio interface transmitter is used to output digital audio signals.
[0007] Furthermore, in some embodiments, the control signal encoder includes a differential driver and a differential receiver, wherein the differential receiver is used to serially receive serial port control signals, and the differential driver is used to output differential control signals.
[0008] Furthermore, in some embodiments, the control signal decoder includes a differential receiver and a differential driver, wherein the differential receiver is used to serially receive differential control signals and the differential driver is used to output serial port control signals.
[0009] Furthermore, in some embodiments, the main chassis differential drive module is also provided with a first audio serial port and a first control serial port, the audio serial port being connected to the audio encoder circuit, and the first control serial port being connected to the control signal encoder circuit. The first audio serial port is used to connect to the power amplifier of the main unit and receive the digital audio signal from the power amplifier of the main unit, and the second control serial port is used to connect to the MCU controller of the main unit and receive the serial control signal from the MCU controller of the main unit.
[0010] Furthermore, in some embodiments, the sub-box differential input module is also provided with a second audio serial port and a second control serial port. The audio serial port is connected to the audio decoder circuit, and the second control serial port is connected to the control signal decoder circuit. The second audio serial port is used to connect to the power amplifier of the auxiliary box and transmit digital audio signals to the power amplifier of the auxiliary box. The second control serial port is used to connect to the MCU controller of the auxiliary box and transmit serial control signals to the MCU controller of the auxiliary box.
[0011] Furthermore, in some embodiments, the number of differential input line receivers is four.
[0012] Furthermore, in some embodiments, the cable is a network cable.
[0013] According to an embodiment of the present invention, a wired differential circuit for connecting main and auxiliary active speakers has at least the following advantages: Through the parallel design of the audio encoder and the control signal encoder, two independent signals are transmitted synchronously using differential signals. Utilizing the common-mode noise suppression characteristics of differential transmission, the impact of electromagnetic interference on signal quality during long-distance cable transmission is significantly reduced. Simultaneously, the main speaker interface and the auxiliary speaker interface establish a communication link through a standardized differential transmission protocol, simplifying the wiring complexity of multi-auxiliary speaker cascading expansion and further reducing the high-specification requirements for transmission cables. This eliminates the need for high-purity copper speaker wires and gold-plated terminals to optimize signal transmission, thus reducing deployment costs while ensuring signal transmission stability. Furthermore, it avoids the problem of poor contact in the wiring connectors caused by the large current brought by high-specification cables. Additionally, the main speaker differential drive module is deployed in the main speaker, and the auxiliary speaker differential input module is deployed in the auxiliary speaker, ensuring consistent internal cavity space between the main and auxiliary speakers and solving the problem of inconsistent audio frequency characteristics between the main and auxiliary speakers.
[0014] Other features and advantages of this invention will be set forth in the following description and will be apparent in part from the description. The objectives and other advantages of this invention can be realized and obtained through the structures particularly pointed out in the description and the accompanying drawings. Attached Figure Description
[0015] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is an overall structural diagram of a wired differential circuit for connecting main and secondary active speakers, provided in some embodiments of this application.
[0017] Reference numerals: Main enclosure differential drive module 100, audio encoder 110, control signal encoder 120, first audio serial port 130, first control serial port 140, main enclosure interface 200, auxiliary enclosure interface 300, auxiliary enclosure differential input module 400, audio decoder 410, control signal decoder 420, second audio serial port 430, second control serial port 440. Detailed Implementation
[0018] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0019] In the description of this utility model, the use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0021] In current technology, the main and auxiliary speakers of active speakers are generally connected via ordinary speaker wires. However, as speaker power increases and the distance between the two speakers grows, expensive high-purity copper speaker wires and gold-plated terminals must be used to reduce power loss. Furthermore, during prolonged use, the connectors will heat up and oxidize due to the continuous flow of high current, leading to poor contact later on. Additionally, since most power amplifier circuitry is integrated into the main speaker, the remaining space inside the main and auxiliary speakers is significantly different, resulting in inconsistent sound frequency characteristics between them.
[0022] Based on this, the present invention provides a wired differential circuit for connecting main and auxiliary active speakers, which eliminates the need for high-purity copper speaker wires and gold-plated terminals, reducing manufacturing costs; it also avoids poor contact of the connectors in the later stages of the connection, and solves the problem of inconsistent audio frequency characteristics between the main and auxiliary speakers.
[0023] Firstly, referring to Figure 1 As shown, Figure 1This is an overall structural diagram of a wired differential circuit for connecting main and auxiliary active speakers, provided in some embodiments of this application. The wired differential circuit includes a main speaker differential driver module 100, a main speaker interface 200, an auxiliary speaker interface 300, and an auxiliary speaker differential input module 400. The main speaker differential driver module 100 includes an audio encoder 110 and a control signal encoder 120. The auxiliary speaker differential input module 400 includes an audio decoder 410 and a control signal decoder 420. The audio encoder 110 and the control signal encoder 120 are respectively connected to the main speaker interface 200, and are connected in parallel. The auxiliary speaker interface 300 and the main speaker interface 200 are connected via a cable for communication. The auxiliary speaker differential input module 400 includes an audio decoder 410 and a control signal decoder 420, which are respectively connected to the auxiliary speaker interface 300, and are connected in parallel.
[0024] It should be noted that the audio encoder 110 is used to convert the digital audio signal of the main unit into a differential audio signal, and the control signal encoder 120 is used to convert the serial port control signal of the main unit into a differential control signal; the main unit interface 200 is used to send the differential audio signal and differential control signal in the main unit to the secondary unit in differential form; the secondary unit interface 300 is used to receive the differential audio signal and differential control signal in the secondary unit; the audio decoder 410 is used to decode the differential audio signal to enable the secondary unit to output audio; and the control signal decoder 420 is used to decode the differential control signal to control the secondary unit.
[0025] In one embodiment, the cable between the main box interface 200 and the secondary box interface 300 is a fiber optic network cable.
[0026] It should be noted that by using the parallel design of the audio encoder 110 and the control signal encoder 120, two independent signals are transmitted synchronously using differential signals. Utilizing the common-mode noise suppression characteristics of differential transmission, the impact of electromagnetic interference on signal quality during long-distance cable transmission is significantly reduced. Simultaneously, the main enclosure interface 200 and the auxiliary enclosure interface 300 establish a communication link through a standardized differential transmission protocol, simplifying the wiring complexity of multi-external enclosure cascade expansion and further reducing the high-specification requirements for transmission cables. This eliminates the need for high-purity copper speaker wires and gold-plated terminals to optimize signal transmission, thus reducing deployment costs while ensuring signal transmission stability. Furthermore, it avoids the problem of poor contact in the wiring connectors caused by the high current brought by high-specification cables. Additionally, the deployment of the main enclosure differential drive module 100 in the main enclosure and the auxiliary enclosure differential input module 400 in the auxiliary enclosure ensures consistent internal cavity space between the main and auxiliary enclosures, resolving the issue of inconsistent audio frequency characteristics between them.
[0027] Furthermore, the audio encoder 110 includes a first digital audio interface transmitter and a first digital audio interface receiver. The first digital audio interface receiver has multiple differential input line receivers built in, and the first digital audio interface transmitter has a differential line driver built in. The first digital audio interface receiver is used to serially receive digital audio signals and convert them into differential audio signals, and the first digital audio interface transmitter is used to output differential audio signals.
[0028] Furthermore, the audio decoder 410 includes a second digital audio interface transmitter and a second digital audio interface receiver, the second digital audio interface receiver having a plurality of differential input line receivers built in; in one embodiment, the number of differential input line receivers is four.
[0029] The second digital audio interface receiver is used to serially receive differential audio signals and convert them into digital audio signals, while the second digital audio interface transmitter is used to output digital audio signals.
[0030] Furthermore, the control signal encoder 120 includes a differential driver and a differential receiver. The differential receiver is used to serially receive serial port control signals, and the differential driver is used to output differential control signals.
[0031] Furthermore, the control signal decoder 420 includes a differential receiver and a differential driver. The differential receiver is used to serially receive differential control signals, and the differential driver is used to output serial port control signals.
[0032] Furthermore, the main chassis differential drive module 100 is also provided with a first audio serial port 130 and a first control serial port 140. The audio serial port is connected to the audio encoder 110 circuit, and the first control serial port 140 is connected to the control signal encoder 120 circuit. The first audio serial port 130 is used to connect to the power amplifier of the main unit and receive the digital audio signal from the power amplifier of the main unit, and the second control serial port 440 is used to connect to the MCU controller of the main unit and receive the serial control signal from the MCU controller of the main unit.
[0033] Furthermore, the sub-box differential input module 400 is also provided with a second audio serial port 430 and a second control serial port 440. The audio serial port is connected to the audio decoder 410 circuit, and the second control serial port 440 is connected to the control signal decoder 420 circuit. The second audio serial port 430 is used to connect to the power amplifier of the auxiliary box and transmit digital audio signals to the power amplifier of the auxiliary box, and the second control serial port 440 is used to connect to the MCU controller of the auxiliary box and transmit serial control signals to the MCU controller of the auxiliary box.
[0034] It should also be noted that the wired differential circuit in this application embodiment can also solve various problems in long-distance transmission of digital audio signals and serial port control signals, such as: 1. Signal integrity: Both digital audio signals and serial port control signals are single-ended signals, which are susceptible to noise, capacitance effects, and electromagnetic interference (EMI), leading to waveform distortion. 2. Clock synchronization: Digital audio signals rely on the synchronization clock (SCK) between master and slave devices. Long-distance transmission may cause clock skew and jitter, disrupting timing. 3. Signal attenuation: High-speed digital audio signals and serial port control signals attenuate faster in long wires.
[0035] It should be understood that in this utility model, "at least one (item)" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A wired differential circuit for connecting primary and secondary active speakers, characterized in that, include: The main chassis differential drive module includes an audio encoder and a control signal encoder. The audio encoder is used to convert the digital audio signal of the main chassis into a differential audio signal, and the control signal encoder is used to convert the serial port control signal of the main chassis into a differential control signal. The main enclosure interface is connected to the main enclosure interface circuit, and the audio encoder and the control signal encoder are connected in parallel. The main enclosure interface is used to send the differential audio signal and the differential control signal in the main enclosure to the auxiliary enclosure in differential form. A secondary speaker interface is connected to the primary speaker interface via a cable for communication. The secondary speaker interface is used to receive the differential audio signal and the differential control signal in the secondary speaker. The auxiliary speaker differential input module includes an audio decoder and a control signal decoder. The audio decoder and the control signal decoder are respectively connected to the auxiliary speaker interface circuit. The audio decoder and the control signal decoder are connected in parallel. The audio decoder is used to decode the differential audio signal to enable the auxiliary speaker to output audio. The control signal decoder is used to decode the differential control signal to control the auxiliary speaker.
2. The wired differential circuit according to claim 1, characterized in that, The audio encoder includes a first digital audio interface transmitter and a first digital audio interface receiver. The first digital audio interface receiver has multiple differential input line receivers built in, and the first digital audio interface transmitter has a differential line driver built in. The first digital audio interface receiver is used to serially receive the digital audio signal and convert it into the differential audio signal, and the first digital audio interface transmitter is used to output the differential audio signal.
3. The wired differential circuit according to claim 1, characterized in that, The audio decoder includes a second digital audio interface transmitter and a second digital audio interface receiver, wherein the second digital audio interface receiver has multiple differential input line receivers built in. The second digital audio interface receiver is used to serially receive the differential audio signal and convert it into the digital audio signal, and the second digital audio interface transmitter is used to output the digital audio signal.
4. The wired differential circuit according to claim 1, characterized in that, The control signal encoder includes a differential driver and a differential receiver. The differential receiver is used to serially receive the serial port control signal, and the differential driver is used to output the differential control signal.
5. The wired differential circuit according to claim 1, characterized in that, The control signal decoder includes a differential receiver and a differential driver. The differential receiver is used to serially receive the differential control signal, and the differential driver is used to output the serial port control signal.
6. The wired differential circuit according to claim 1, characterized in that, The main chassis differential drive module is also provided with a first audio serial port and a first control serial port. The audio serial port is connected to the audio encoder circuit, and the first control serial port is connected to the control signal encoder circuit. The first audio serial port is used to connect to the power amplifier of the main unit and receive the digital audio signal from the power amplifier of the main unit, and the second control serial port is used to connect to the MCU controller of the main unit and receive the serial control signal from the MCU controller of the main unit.
7. The wired differential circuit according to claim 1, characterized in that, The sub-box differential input module is also provided with a second audio serial port and a second control serial port. The audio serial port is connected to the audio decoder circuit, and the second control serial port is connected to the control signal decoder circuit. The second audio serial port is used to connect to the power amplifier of the secondary enclosure and transmit the digital audio signal to the power amplifier of the secondary enclosure. The second control serial port is used to connect to the MCU controller of the secondary enclosure and transmit the serial port control signal to the MCU controller of the secondary enclosure.
8. The wired differential circuit according to claim 2 or 3, characterized in that, The number of differential input line receivers is four.
9. The wired differential circuit according to claim 1, characterized in that, Both the main enclosure interface and the auxiliary enclosure interface are RJ45 network interfaces.
10. The wired differential circuit according to claim 1, characterized in that, The cable in question is a network cable.