Modularized audio frequency distributor

Abstract

The utility model discloses a modularized audio frequency distributor which comprises a plurality of fixed audio frequency distribution isolation modules with independent channels and a plurality of optional function modules, the fixed audio frequency distribution isolation modules are arranged in a main shell, and the function modules comprise phantom power supply modules, audio frequency signal level indication modules and extended audio frequency distribution isolation modules. The main shell is provided with a modular slot, and any one or more functional modules are connected with the modular slot in a pluggable mode. According to the utility model, through the center tap design of the four-winding isolation transformer, input / output signal physical isolation is realized, common-ground current noise interference is eliminated, and the modular slot supports plug and play of functional modules such as phantom power supply, level indication and channel expansion. The problems of common-ground switching noise of traditional equipment and damage of a phantom power supply to an isolation structure are solved, flexible function configuration is realized through a hot plug design, system wiring complexity is reduced, and audio signal transmission quality and equipment maintenance efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of audio processing technology, and more specifically, to a modular audio distributor. Background Technology

[0002] A passive audio distributor is a device used in the field of audio signal transmission and distribution. When an audio signal is input to the audio distributor, the audio signal is copied and distributed to multiple output ports through internal passive components such as transformers or resistors and capacitors, so that multiple audio devices can receive the same audio signal at the same time, achieving the technical effect of one input and multiple outputs.

[0003] Traditional audio distributors employ an integrated, fixed design, and their signal isolation architecture typically relies on a combination of unbalanced windings and common-ground switches. When the input and output terminals are connected to a common ground via a common-ground switch, current noise interference can easily occur in the grounding loop due to the phase difference of the power supply between different devices, forcing technicians to add an isolator in series in the signal link to eliminate noise. Furthermore, for applications requiring phantom power, traditional audio distributors require the power supply line to be connected in parallel at the input, a design that imposes additional technical requirements on the audio system and is not intuitive. In addition, when building a hot-backup system, existing audio distributors often require cascading cabling across multiple distributors, increasing cable complexity and potentially causing a single point of failure to trigger a multi-channel cascading failure.

[0004] In addition, traditional audio distributors have significant limitations in expanding their functionality. When users need additional functions, they must rely on external devices connected via cables. This not only leads to increased system size and difficulty in troubleshooting, but also introduces new signal distortion due to impedance matching issues between different devices. This rigid architecture results in low device reuse rates, and upgrades and maintenance often require complete replacement of the entire unit, leading to wasted resources. Summary of the Invention

[0005] To address the problems caused by the integrated and fixed nature of traditional audio distributors, this invention provides a modular audio distributor.

[0006] The technical solution of this utility model is as follows:

[0007] A modular audio distributor includes multiple fixed audio distribution isolation modules with independent channels and several optional functional modules. The fixed audio distribution isolation modules are built into the main housing. The functional modules include a phantom power module, an audio signal level indicator module, and an extended audio distribution isolation module. The main housing is provided with modular slots, and any one or more functional modules are pluggable to the modular slots.

[0008] The utility model discloses a four winding isolation transformer's center tap design realizes input / output signal physical isolation, eliminates the common ground current noise interference, and the modularization slot supports phantom power, level indication and channel expansion function module's plug and play, solves the problem of traditional equipment common ground switch noise and phantom power destruction isolation structure, realizes the flexible configuration of function through the hot plug design, reduces the system wiring complexity, avoids the multi-channel failure caused by single point failure, and significantly improves the audio signal transmission quality and equipment maintenance efficiency.

[0009] The phantom power module is connected with the modularization slot to form a passive audio distributor with phantom power supply.

[0010] The audio signal level indication module is connected with the modularization slot to form a passive audio distributor with level indication.

[0011] The audio signal level indication module and the phantom power module are connected with the modularization slot to form a full-featured audio distributor.

[0012] The extension audio distribution isolation module is connected with the modularization slot to form an extension channel audio distributor.

[0013] The fixed audio distribution isolation module or the extension audio distribution isolation module each includes an independently isolated isolation transformer, and the isolation transformer includes a signal input winding and a signal output winding.

[0014] Further, the signal input end is connected with the center tap of the signal input winding, and the plurality of signal output ends are respectively connected with the center taps of different signal output windings.

[0015] Further, the audio signal level indication module is respectively connected with the signal input winding and the signal input end through a capacitor.

[0016] Further, each winding of the isolation transformer is a double-wire parallel winding structure, and the winding is provided with a center tap.

[0017] Further, the signal input end is connected with an external line through a single-row socket, a hot end of the signal input end is connected with one port of the signal input winding, a cold end of the signal input end is connected with another port of the signal input winding, and the signal output windings are all connected with the single-row socket.

[0018] Further, the signal input end is connected with the isolation transformer through the impedance switching switch, and output windings of the isolation transformer are connected with different output interfaces respectively.

[0019] Still further, a connecting port is arranged and connected with the isolation transformer through the impedance switching switch.

[0020] The audio signal input interface of the fixed audio distribution isolation module, the audio signal output interface of the fixed audio distribution isolation module, the audio signal input interface of the extended audio distribution isolation module, the audio signal output interface of the extended audio distribution isolation module and the phantom power output interface are all phoenix terminal connection interfaces.

[0021] According to the above-mentioned scheme, the utility model has the advantages that,

[0022] 1. The audio signal is distributed to multiple output ports, and through the four-winding transformer with a center tap, the real physical isolation between the input signal and the output signal is ensured, the common ground current noise is eliminated, the purity of signal transmission is ensured, the quality of the audio signal is improved, the interference is reduced, and the reliability of the system is improved.

[0023] 2. The modular design enables users to select different module combinations according to needs, realize multiple functions of the same device, and adapt to audio systems in different use scenarios. Among them, the phantom power module, the audio signal level indication module and the extended audio distribution isolation module can be inserted into separate housings to form independent phantom power supplies, independent signal level indicators and independent small audio distributors (two channels).

[0024] 3. The audio signal input / output interface and the phantom power output interface both use phoenix terminals, which do not need to be welded, and are convenient to install and maintain.

[0025] 4. The signal input end is connected with the isolation transformer through the impedance switching switch to match the 0dBu and 0dBV two signal level standards, and through the switching, different types of audio input devices are adapted.

[0026] 5. Balanced connection and unbalanced connection are supported to adapt to different system requirements, improve the versatility and applicability of the device, and simplify the audio system design.

[0027] 6. It has multi-channel processing capability and supports simultaneous processing of multiple audio signals, and is suitable for complex audio systems. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] Figure 1 Front and back surface structure schematic diagram of full-function audio distributor.

[0030] Figure 2 Front and back surface structure schematic diagram of passive audio distributor with phantom power supply.

[0031] Figure 3 Front and back surface structure schematic diagram of audio distributor with expanded channels.

[0032] Figure 4 Circuit connection structure schematic diagram of audio distributor with phantom power module and audio signal level indication module.

[0033] Figure 5 Circuit structure schematic diagram of one channel of fixed audio distribution isolation module.

[0034] Figure 6 Circuit structure schematic diagram of another channel of fixed audio distribution isolation module.

[0035] Figure 7 Connection structure schematic diagram of one single-row socket of audio distributor.

[0036] Figure 8 Circuit structure schematic diagram of single channel of fixed audio distribution isolation module or expanded audio distribution isolation module connected with microphone.

[0037] Figure 9 Partial structure schematic diagram of Figure 8 . Figure 1 .

[0038] Figure 10 Partial structure schematic diagram of Figure 8 . Figure 2 .

[0039] In the drawings, various reference signs represent:

[0040] 1. audio distributor; 2. fixed audio distribution isolation module; 3. phantom power module; 4. audio signal level indication module; 5. expanded audio distribution isolation module; 6. identification panel. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model.

[0042] The utility model discloses an audio distributor 1, including a plurality of fixed audio distribution isolation module 2 with independent channel and a plurality of optional function module, and the fixed audio distribution isolation module is built -in in the main casing, and the function module includes phantom power module 3, audio signal level indication module 4 and extension audio distribution isolation module 5, and the main casing sets up modular slot, and any one or more function modules and modular slot are all pluggable connection.

[0043] In the utility model, the function module includes extension audio distribution isolation module, phantom power module (provides direct current bias voltage for fixed audio distribution isolation module, does not need other external power supply equipment, and the channel number of phantom power is same as the channel number of fixed audio distribution isolation module), audio signal level indication module (as signal monitoring equipment, reduces the demand of external test instrument).

[0044] The shell of the audio distributor sets up modular slot, replaces the function module through plugging, and quickly realizes equipment form switching to adapt to different scene demands (such as performance, recording, debugging etc.). In addition, the function module can be directly replaced when it is faulty, and the maintenance downtime is shortened. The plug-in design can reuse the main casing power supply and signal bus, avoid redundant circuit design, and reduce the complexity of cable.

[0045] In a specific embodiment, as shown in Figure 1 The modular slot of the main casing of the audio distributor is inserted into eight-way phantom power module and audio signal level indication module for monitoring input audio signal respectively, plus the built-in eight-channel fixed audio distribution isolation module, and is used as an audio distributor, and is suitable for the scene that needs to provide phantom power and signal level indication simultaneously.

[0046] In a specific embodiment, as shown in Figure 2 The front of the audio distributor is provided with an identification panel to block the socket part, and the modular slot of the back of the audio distributor is inserted into eight-way phantom power module, plus the built-in eight-channel fixed audio distribution isolation module, and is used as an audio distributor, and is suitable for the audio system that needs phantom power supply.

[0047] In a specific embodiment, the modular slot of the audio distributor is inserted into the audio signal level indication module for monitoring input audio signal, plus the built-in eight-channel fixed audio distribution isolation module, and is used as an audio distributor, and is suitable for the scene that needs signal level indication but does not need phantom power.

[0048] In one implementation, no functional module is inserted into the modular slot of the audio distributor, the built-in eight-channel fixed audio distribution isolation module makes the device used as an audio distributor with physical isolation, suitable for scenarios that require physical isolation but do not require phantom power or signal level indication.

[0049] In one implementation, as shown in Figure 3 The front of the audio distributor is provided with an identification panel to block the socket part, and the modular slot on the back of the audio distributor is inserted with an extended audio distribution isolation module, plus the built-in eight-channel fixed audio distribution isolation module, to form a ten-channel physical isolation type audio distributor.

[0050] In one implementation, the audio distributor is provided with an external interface for connecting an external phantom power supply, plus the built-in eight-channel fixed audio distribution isolation module, to be used as an audio distributor connected to an external phantom power supply.

[0051] The audio distributor includes a plurality of audio distribution isolation modules with independent channels, and each audio distribution isolation module includes an isolated transformer independently isolated, and the isolated transformer includes a signal input winding and a signal output winding, and the signal input winding and the signal output winding are each provided with a separate center tap, and the center taps of the windings are respectively connected to a signal input end and a signal output end.

[0052] The audio distributor of the utility model is provided with a plurality of independent channels, has multi-channel processing capacity, so that the audio distributor can process multiple audio signals at the same time, is suitable for complex audio systems, and improves the expansibility and adaptability of the audio distributor. The design of independent windings ensures that the input and output signals of each channel are transmitted through magnetic coupling, completely cuts off the common ground loop, eliminates current noise caused by power supply phase difference or poor grounding, and solves the common ground switch problem of unbalanced windings.

[0053] As shown in Figure 4 The signal input end is connected to the center tap of the signal input winding, and the plurality of signal output ends are respectively connected to the center taps of different signal output windings. The audio distributor includes a plurality of independent audio signal level indication modules, and the audio signal level indication modules are respectively connected to the signal input winding and the signal input end through a capacitor. The audio distributor includes a plurality of independent phantom power modules.

[0054] The signal input winding and the signal output winding of the fixed audio distribution isolation module or the extended audio distribution isolation module are provided with a center tap, and the impedance adaptation and balanced / unbalanced adaptation are realized by switching the ground (connecting the microphone of the signal input end) or the matching resistor. The audio signal level indication module is connected through the capacitive isolation (using the parallel port), and the independent level detection winding of the audio signal level indication module is not directly electrically connected with the signal input winding. The phantom power supply is isolated by the optocoupler and the isolation transformer, and provides a DC bias voltage for the signal input end.

[0055] The center tap design of the isolation transformer enables the signal input end and the signal output end to be adaptively connected in balanced or unbalanced mode, and completely eliminates the current noise caused by the ground loop. The audio signal level indication module detects the signal through capacitive isolation, avoiding the introduction of additional load to affect the sound quality. The phantom power supply module is isolated from the isolation transformer for power supply, preventing power interference from entering the signal link.

[0056] The audio signal input interface of the fixed audio distribution isolation module, the audio signal output interface of the fixed audio distribution isolation module, the audio signal input interface of the extended audio distribution isolation module, the audio signal output interface of the extended audio distribution isolation module, and the phantom power output interface are all phoenix terminal connection interfaces.

[0057] The phoenix terminal supports plug-in connection without welding, is convenient to connect, has short single-channel wiring time, strong connection reliability, and supports balanced and unbalanced mixed connection, and is suitable for different device interfaces.

[0058] Each winding of the isolation transformer is a double-wire parallel winding structure, and the winding is provided with a center tap. The center tap forms a positive-ground-negative balanced architecture by connecting a matching resistor.

[0059] The positive-ground-negative structure of the signal input winding and the signal output winding can completely eliminate the common ground interference. The center tap of the winding is independently grounded or impedance matched, completely cutting off the common ground loop between the signal input end and the signal output end, solving the current noise problem caused by the failure of the common ground switch in traditional audio distribution devices, and automatically compatible with balanced and unbalanced interfaces by switching the center tap grounding mode without manual intervention of the common ground switch.

[0060] The signal input end is connected to an external line through a single-row socket. The hot end of the signal input end is respectively connected to a current limiting resistor and one port of the signal input winding, and the cold end of the signal input end is respectively connected to a current limiting resistor and the other port of the signal input winding. The signal output winding is connected to a single-row socket, and the current limiting resistor is connected to the single-row socket through an isolation capacitor.

[0061] As Figure 5 , Figure 6As shown, the circuit structure of the single channel of the fixed audio distribution isolation module or the extended audio distribution isolation module is shown as follows.

[0062] The hot end of the signal input end is respectively connected with the third port of the forty-first wiring terminal, one end of the second resistance and the third port of the signal input winding.

[0063] The cold end of the signal input end is respectively connected with the second port of the forty-first wiring terminal, the other end of the third resistance and the fourth port of the signal input winding.

[0064] The first port of the forty-first wiring terminal is respectively connected with the ground end of the first signal input port, the other end of the fourth resistance and one end of the fifth resistance, the second port of the forty-first wiring terminal is respectively connected with the cold end of the signal input end, the other end of the third resistance and the fourth port of the signal input winding, and the third port of the forty-first wiring terminal is respectively connected with the hot end of the signal input end, one end of the second resistance, the third port of the signal input winding.

[0065] One end of the second resistance is respectively connected with the hot end of the signal input end, the third port of the forty-first wiring terminal and the third port of the signal input winding, and the other end of the second resistance is respectively connected with one end of the third resistance and one end of the fourth resistance.

[0066] One end of the third resistance is respectively connected with the other end of the second resistance and one end of the fourth resistance, and the other end of the third resistance is respectively connected with the cold end of the signal input end and the fourth port of the signal input winding.

[0067] One end of the fourth resistance is respectively connected with the other end of the second resistance and one end of the third resistance, and the other end of the fourth resistance is respectively connected with one end of the fifth resistance and the signal input ground end.

[0068] One end of the fifth resistance is respectively connected with the signal input ground end and the other end of the fourth resistance, and the other end of the fifth resistance is connected with one end of the forty-ninth resistance.

[0069] One end of the forty-ninth resistance is connected with the other end of the fifth resistance, and the other end of the forty-ninth resistance is connected with one end of the third capacitor.

[0070] The third capacitor is connected with the other end of the forty-ninth resistance, and the other end of the third capacitor is connected with the single-row socket.

[0071] The third port of the signal input winding is respectively connected with the hot end of the signal input end, one end of the second resistance and the third port of the forty-first wiring terminal, and the fourth port of the signal input winding is respectively connected with the cold end of the signal input end, the second port of the forty-first wiring terminal and the other end of the third resistance.

[0072] The seventh port of the first signal output winding, the eighth port of the first signal output winding, the fifth port of the second signal output winding, the sixth port of the second signal output winding, the first port of the third signal output winding and the second port of the third signal output winding are connected to the single-row socket.

[0073] The circuit structure of all channels of the fixed audio distribution isolation module or the extended audio distribution isolation module is the same as the above circuit structure, as shown in Figure 6 , and each two channels share one single-row socket to connect external lines, as shown in Figure 7 .

[0074] The signal input end is connected to the isolation transformer through the impedance switching switch, and the output winding of the isolation transformer is connected to different output interfaces.

[0075] The audio distributor is also provided with a patch port, and the patch port is connected to the isolation transformer through the impedance switching switch.

[0076] The signal input end is connected to the isolation transformer through the impedance switching switch to match the 0dBu and 0dBV two signal level standards.

[0077] In an embodiment, as shown in Figure 8 , Figure 9 , Figure 10 , the signal input end is a microphone input end, and the audio distributor connected to the microphone is provided with the circuit structure of a single channel of the fixed audio distribution isolation module of the impedance conversion module, as shown below.

[0078] The first connection point of the microphone input end and the G connection point are grounded, the second connection point of the microphone input end is connected to the second end point of the phase switching switch, and the third connection point of the microphone input end is connected to the fifth end point of the phase switching switch.

[0079] The first end point of the phase switching switch is respectively connected to the sixth end point of the phase switching switch, the other end of the seventh resistor, the third connection point of the patch port and the fifth end point of the impedance switching switch,

[0080] The second end point of the phase switching switch is connected to the second connection point of the microphone input end,

[0081] The third end point of the phase switching switch is connected to the fourth end point of the phase switching switch, one end of the sixth resistor, the second connection point of the patch port, the second end point of the impedance switching switch,

[0082] The fourth end point of the phase switching switch is connected to the third end point of the phase switching switch, one end of the sixth resistor, the second connection point of the patch port, the second end point of the impedance switching switch,

[0083] The fifth end point of the phase switching switch is connected to the third connection point of the microphone input end,

[0084] The sixth terminal of the phase switching switch is connected to the first terminal of the phase switching switch, the other terminal of the seventh resistor, the third connection point of the parallel port, and the fifth terminal of the impedance switching switch.

[0085] The first connection point of the parallel port is grounded,

[0086] The second connection point of the parallel port is connected to one end of the sixth resistor, the third terminal of the phase switching switch, the fourth terminal of the phase switching switch, and the second terminal of the impedance switching switch, respectively,

[0087] The third connection point of the parallel port is connected to the first terminal of the phase switching switch, the sixth terminal of the phase switching switch, the other terminal of the seventh resistor, the fifth terminal of the impedance switching switch, respectively,

[0088] The G connection point of the parallel port is grounded.

[0089] One end of the sixth resistor is connected to the third terminal of the phase switching switch, the fourth terminal of the phase switching switch, the second connection point of the parallel port, and the second terminal of the impedance switching switch, respectively, and the other end of the sixth resistor is connected to one end of the seventh resistor and one end of the eighth resistor.

[0090] One end of the seventh resistor is connected to the other end of the sixth resistor and one end of the eighth resistor, and the other end of the seventh resistor is connected to the first terminal of the phase switching switch, the sixth terminal of the phase switching switch, the third connection point of the parallel port, and the fifth terminal of the impedance switching switch, respectively.

[0091] One end of the eighth resistor is connected to the other end of the sixth resistor and one end of the seventh resistor, and the other end of the eighth resistor is grounded.

[0092] The first terminal of the impedance switching switch is connected to the seventh terminal of the isolation transformer,

[0093] The second terminal of the impedance switching switch is connected to one end of the sixth resistor, the third terminal of the phase switching switch, and the fourth terminal of the phase switching switch, respectively,

[0094] The third terminal of the impedance switching switch is connected to the third terminal of the isolation transformer,

[0095] The fourth terminal of the impedance switching switch is connected to the fifth terminal of the isolation transformer,

[0096] The fifth terminal of the impedance switching switch is connected to the other end of the seventh resistor, the first terminal of the phase switching switch, the sixth terminal of the phase switching switch, and the third connection point of the parallel port, respectively.

[0097] The sixth terminal of the impedance switching switch is connected to the first terminal of the isolation transformer.

[0098] the first end point of the isolation transformer is connected to the sixth end point of the impedance switching switch,

[0099] the second end point of the isolation transformer is connected to the other end of the thirteenth resistor and the second connection point of the second output interface respectively,

[0100] the third end point of the isolation transformer is connected to the third end point of the impedance switching switch,

[0101] the fourth end point of the isolation transformer is connected to one end of the fourteenth resistor and the third connection point of the second output interface respectively,

[0102] the fifth end point of the isolation transformer is connected to the fourth end point of the impedance switching switch,

[0103] the sixth end point of the isolation transformer is connected to the other end of the fifteenth resistor and the second connection point of the first output interface respectively,

[0104] the seventh end point of the isolation transformer is connected to the first end point of the impedance switching switch,

[0105] the eighth end point of the isolation transformer is connected to one end of the ninth resistor and the third connection point of the first output interface respectively.

[0106] one end of the ninth resistor is connected to the eighth end point of the isolation transformer, and the other end of the ninth resistor is connected to one end of the fifteenth resistor and one end of the sixteenth resistor respectively.

[0107] one end of the twelfth resistor is connected to the other end of the fourteenth resistor and one end of the thirteenth resistor respectively, and the other end of the twelfth resistor is grounded.

[0108] one end of the thirteenth resistor is connected to the other end of the fourteenth resistor and one end of the twelfth resistor respectively, and the other end of the thirteenth resistor is connected to the second end point of the isolation transformer and the second connection point of the second output interface respectively.

[0109] one end of the fourteenth resistor is connected to the fourth end point of the isolation transformer and the third connection point of the second output interface respectively.

[0110] one end of the fifteenth resistor is connected to the other end of the ninth resistor and one end of the sixteenth resistor respectively, and the other end of the fifteenth resistor is connected to the sixth end point of the isolation transformer and the second connection point of the first output interface respectively.

[0111] one end of the sixteenth resistor is connected to the other end of the ninth resistor and one end of the fifteenth resistor respectively, and the other end of the sixteenth resistor is grounded.

[0112] the first connection point of the first output interface is connected to one end of the second capacitor, the anode of the first diode, the cathode of the second diode and the first end point of the common ground switch respectively,

[0113] The second connection point of the first output interface is connected with the other end of the fifteenth resistor and the sixth end point of the isolation transformer respectively,

[0114] The third connection point of the first output interface is connected with one end of the ninth resistor and the eighth end point of the isolation transformer respectively,

[0115] The G connection point of the first output interface is grounded.

[0116] The first connection point of the second output interface is connected with one end of the first capacitor, the anode of the third diode, the cathode of the fourth diode and the fourth end point of the common ground switch respectively,

[0117] The second connection point of the second output interface is connected with the other end of the thirteenth resistor and the second end point of the isolation transformer respectively,

[0118] The third connection point of the second output interface is connected with one end of the fourteenth resistor and the fourth end point of the isolation transformer respectively,

[0119] The G connection point of the second output interface is grounded.

[0120] The anode of the first diode is connected with one end of the second capacitor, the cathode of the second diode, the first end point of the common ground switch and the first connection point of the first output interface respectively, and the cathode of the first diode is connected with the other end of the second capacitor, the anode of the second diode and the second end point of the common ground switch respectively.

[0121] The anode of the second diode is connected with the cathode of the first diode, the other end of the second capacitor and the second end point of the common ground switch respectively, and the cathode of the second diode is connected with the anode of the first diode, one end of the second capacitor and the first end point of the common ground switch and the first connection point of the first output interface respectively.

[0122] The anode of the third diode is connected with one end of the first capacitor, the first connection point of the second output interface, the cathode of the fourth diode and the fourth end point of the common ground switch respectively, and the cathode of the third diode is connected with the other end of the first capacitor, the anode of the fourth diode and the fifth end point of the common ground switch respectively.

[0123] The anode of the fourth diode is connected with the cathode of the third diode, the other end of the first capacitor and the fifth end point of the common ground switch respectively, and the cathode of the fourth diode is connected with the anode of the third diode, one end of the first capacitor, the first connection point of the second output interface and the fourth end point of the common ground switch respectively.

[0124] One end of the first capacitor is connected with the cathode of the fourth diode, the anode of the third diode, the first connection point of the second output interface and the fourth end point of the common ground switch respectively, and the other end of the first capacitor is connected with the cathode of the third diode, the anode of the fourth diode and the fifth end point of the common ground switch respectively.

[0125] One end of the second capacitor is connected with the anode of the first diode, the cathode of the second diode, the first end point of the common ground switch and the first connecting point of the first output interface respectively, and the other end of the second capacitor is connected with the cathode of the first diode, the anode of the second diode and the second end point of the common ground switch respectively.

[0126] The first end point of the common ground switch is connected with one end of the second capacitor, the anode of the first diode, the cathode of the second diode and the first connecting point of the first output interface respectively,

[0127] The second end point of the common ground switch is connected with the third end point of the common ground switch,

[0128] The fourth end point of the common ground switch is connected with one end of the first capacitor, the cathode of the fourth diode, the anode of the third diode and the first connecting point of the second output interface respectively,

[0129] The fifth end point of the common ground switch is connected with the sixth end point of the common ground switch,

[0130] The sixth end point of the common ground switch is grounded.

[0131] Similarly, the circuit structure of the channel of the extended audio distribution isolation module connected with the microphone is also the same, which is shown as above.

[0132] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A modular audio distributor, characterized by, The fixed audio distribution isolation module with multiple independent channels and several optional function modules are included, the fixed audio distribution isolation module is built-in the main shell, the function modules include phantom power module, audio signal level indication module and extended audio distribution isolation module, the main shell is provided with modular slot, and any one or more function modules and the modular slot are pluggable connection.

2. A modular audio distributor as claimed in claim 1, wherein, The phantom power module is connected with the modular slot to form a passive audio distributor with phantom power supply.

3. A modular audio distributor as claimed in claim 1, wherein, The audio signal level indication module is connected with the modular slot to form a passive audio distributor with level indication.

4. A modular audio distributor as claimed in claim 1, wherein, The audio signal level indication module and the phantom power module are connected with the modular slot to form a full-featured audio distributor.

5. A modular audio distributor as claimed in claim 1, wherein, The extended audio distribution isolation module is connected with the modular slot to form an extended channel audio distributor.

6. A modular audio distributor as claimed in claim 1, wherein, The fixed audio distribution isolation module or the extended audio distribution isolation module each includes an isolated transformer independently isolated, the isolated transformer includes signal input winding and signal output winding, the signal input winding and the signal output winding are each provided with a separate center tap, and the center taps of the windings are respectively connected with the signal input end and the signal output end.

7. A modular audio distributor as claimed in claim 6, wherein, Each winding of the isolated transformer is a double-wire parallel winding structure, and the winding is provided with a center tap, and the center tap forms a positive-ground-negative balance structure through a connected matching resistor.

8. A modular audio distributor as claimed in claim 6, wherein, The signal input end is connected with the center tap of the signal input winding, and multiple signal output ends are respectively connected with the center taps of different signal output windings; the audio signal level indication module is connected with the signal input winding and the signal input end through a capacitor.

9. A modular audio distributor as claimed in claim 6, wherein, The signal input end is connected with the isolated transformer through an impedance switching switch, and the output windings of the isolated transformer are respectively connected with different output interfaces.

10. A modular audio distributor as claimed in claim 1, wherein, The audio signal input interface of the fixed audio distribution isolation module, the audio signal output interface of the fixed audio distribution isolation module, the audio signal input interface of the extended audio distribution isolation module, the audio signal output interface of the extended audio distribution isolation module and the phantom power output interface are phoenix terminal connection interfaces.

Images