Sound mixing output circuit of active sound box

Abstract

The utility model relates to the technical field of active sound box output control, in particular to a sound mixing output circuit of an active sound box, which comprises a first signal coupling module, a second signal coupling module and an output interface, the first signal coupling module and the second signal coupling module are used for amplifying signals, and one side of the first signal coupling module is electrically connected with a first signal stabilizing module. One side of the first signal stabilizing module is electrically connected with a first voltage control module, one side of the first voltage control module is connected with a first filtering module, one side of the second signal coupling module is electrically connected with a second signal stabilizing module, and one side of the second signal stabilizing module is electrically connected with a second voltage control module. And one side of the second voltage control module is connected with a second filtering module. According to the utility model, the first signal coupling module and the second signal coupling module can be used for carrying out shunt processing on input signals, and carrying out noise reduction and filtering, and finally, audio frequency from multiple sources can be mixed and output.

Description

Technical Field

[0001] The utility model relates to the technical field of active speaker output control, in particular to a mixing output circuit of an active speaker. Background Art

[0002] Active speakers generally refer to an integrated system that combines a power drive unit with a passive speaker system. They have the function of amplifier output. In the design of active speakers, in order to meet the richness of the output audio, multi-source mixed output is usually set. However, when there are too many mixed types, the audio from each source will affect each other. This influence may cause noise, that is, the final output audio has obvious noise, which seriously affects the final output effect of the mixed output. To solve this problem, it is urgent to propose a mixed output circuit for active speakers. Utility Model Content

[0003] The present invention aims to solve the problems existing in the prior art and provides the following technical solutions:

[0004] The mixing output circuit of the active speaker includes: a first signal coupling module and a second signal coupling module for amplifying signals and an output interface.

[0005] Specifically, one side of the first signal coupling module is electrically connected to a first signal stabilization module, one side of the first signal stabilization module is electrically connected to a first voltage control module, one side of the first voltage control module is connected to a first filtering module, one side of the second signal coupling module is electrically connected to a second signal stabilization module, one side of the second signal stabilization module is electrically connected to a second voltage control module, one side of the second voltage control module is connected to a second filtering module, and the other sides of the first filtering module and the second filtering module are electrically connected to the output interface.

[0006] As an improvement of the above technical solution, the first signal coupling module includes a resistor R22, a resistor R23, a capacitor C18, and an amplifier U2B. The resistor R22 is connected in series with the amplifier U2B, and the resistor R23 and the capacitor C18 are connected in parallel to both sides of the amplifier U2B. The second signal coupling module includes a resistor R28, a resistor R30, a capacitor C51, and an amplifier U2A. The resistor R28 is connected in series with the amplifier U2A and the amplifier U2B, and the resistor R30 and the capacitor C51 are connected in parallel to both sides of the amplifier U2A.

[0007] As an improvement of the above technical solution, the first signal stabilization module includes a capacitor C19 and a resistor R50, one side of the capacitor C19 is electrically connected to the amplifier U2B, and the other side of the capacitor C19 is electrically connected to the resistor R50. The second signal stabilization module includes a capacitor C20 and a resistor R51, one side of the capacitor C20 is electrically connected to the amplifier U2A, and the other side of the capacitor C20 is electrically connected to the resistor R50.

[0008] As an improvement of the above technical solution, the first filtering module includes an inductor L1, a capacitor C2, and a resistor R52, and the resistor R50 is connected in series with the inductor L1, the capacitor C2, and the resistor R52 in sequence. The first filtering module includes an inductor L2, a capacitor C5, and a resistor R53, and the resistor 51 is connected in series with the inductor L2, the capacitor C5, and the resistor R53 in sequence. The other side of the resistor R53 is electrically connected to pin 2 of the output interface, and the other side of the resistor R52 is electrically connected to pin 3 of the output interface.

[0009] As an improvement to the above technical solution, the first voltage control module includes a transistor Q2 and a diode D6, the collector of the transistor Q2 is electrically connected between the resistor R50 and the inductor L1, and the diode D6 is electrically connected to the base of the transistor Q2. The second voltage control module includes a transistor Q1 and a diode D5, the transistor Q1 is electrically connected between the resistor R51 and the inductor L2, and the diode D5 is electrically connected to the base of the transistor Q1.

[0010] Beneficial effects of the utility model:

[0011] The first signal coupling module and the second signal coupling module can be used to split the input signal and perform noise reduction filtering, and finally realize the mixed output of audio from multiple sources. The amplifier U2A and the amplifier U2B can be used to reduce the noise and distortion in the signal, and the signal can be further filtered through the first signal stabilization module and other related modules, so that the final output effect is more balanced and the overall audio output effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the mixing output circuit diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the connection position between the mixing output circuit of the present invention and the control circuit of the active speaker in the prior art. DETAILED DESCRIPTION

[0014] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0015] When there are too many types of audio being mixed, the audio from each source will affect each other. This influence may cause noise, that is, the final output audio will have obvious noise, seriously affecting the final output effect of the mixed output.

[0016] To solve the above problem, please refer to Figure 1 , a mixing output circuit of an active speaker is proposed, which includes a first signal coupling module 10 and a second signal coupling module 20 and an output interface 30 for amplifying the signal.

[0017] Specifically, one side of the first signal coupling module 10 is electrically connected to the first signal stabilization module 11, one side of the first signal stabilization module 11 is electrically connected to the first voltage control module 12, one side of the first voltage control module 12 is connected to the first filtering module 13, one side of the second signal coupling module 20 is electrically connected to the second signal stabilization module 21, one side of the second signal stabilization module 21 is electrically connected to the second voltage control module 22, one side of the second voltage control module 22 is connected to the second filtering module 23, and the other side of the first filtering module 13 and the second filtering module 23 is electrically connected to the output interface 30.

[0018] The input signal passes through the first signal coupling module 10 and the second signal coupling module 20. These two modules process the input signal, mainly blocking the DC part and allowing the AC signal to pass through, thereby retaining the important characteristics of the audio. The voltage state in the circuit is controlled by the first voltage control module 12 and the second voltage control module 22, thereby controlling the amplification and switching of the audio signal. The first filter module 13 and the second filter module 23 finally filter the output audio signal to ensure that the final mixed output from the output interface 30 is more balanced and stable.

[0019] For details, please refer to Figure 1Specifically, the first signal coupling module 10 includes a resistor R22, a resistor R23, a capacitor C18, and an amplifier U2B. The resistor R22 is connected in series with the amplifier U2B, and the resistor R23 and the capacitor C18 are connected in parallel to both sides of the amplifier U2B. The second signal coupling module 20 includes a resistor R28, a resistor R30, a capacitor C51, and an amplifier U2A. The resistor R28 is connected in series with the amplifier U2A and the amplifier U2B, and the resistor R30 and the capacitor C51 are connected in parallel to both sides of the amplifier U2A.

[0020] The input impedance is adjusted by resistors R22, R28, and R23, and the signal is coupled by capacitors C18 and C51 to help stabilize signal transmission and prevent DC bias. The signal is amplified by amplifiers U2A and U2B, and is configured according to the conditions of resistors R22, R28, R23, capacitors C18, and C51 to determine the gain and frequency response.

[0021] In one embodiment, see Figure 1 Specifically, the first signal stabilization module 11 includes a capacitor C19 and a resistor R50, one side of the capacitor C19 is electrically connected to the amplifier U2B, and the other side of the capacitor C19 is electrically connected to the resistor R50. The second signal stabilization module 21 includes a capacitor C20 and a resistor R51, one side of the capacitor C20 is electrically connected to the amplifier U2A, and the other side of the capacitor C20 is electrically connected to the resistor R50.

[0022] The input signal is further stabilized and adjusted by capacitors C19 and C20, and input to the first filter module 13 and the second filter module 23 for filtering. The specific filtering scheme is as follows:

[0023] The first filter module 13 includes an inductor L1, a capacitor C2, and a resistor R52. The resistor R50 is connected in series with the inductor L1, the capacitor C2, and the resistor R52 in sequence. The first filter module 13 includes an inductor L2, a capacitor C5, and a resistor R53. The resistor 51 is connected in series with the inductor L2, the capacitor C5, and the resistor R53 in sequence. The other side of the resistor R53 is electrically connected to pin 2 of the output interface, and the other side of the resistor R52 is electrically connected to pin 3 of the output interface.

[0024] That is, the electronic components inside the first filter module 13 and the second filter module 23 form a low-pass filtering state (that is, the inductor L1, the capacitor C2, the resistor R52 and the inductor L2, the capacitor C5, the resistor R53 each form a low-pass filter), and the low-frequency signal in the input signal is filtered out, thereby ensuring the stability of the final output signal.

[0025] To further ensure the controllability of the mixed output, please refer to Figure 1The first voltage control module 12 includes a transistor Q2 and a diode D6. The collector of the transistor Q2 is electrically connected between the resistor R50 and the inductor L1, and the diode D6 is electrically connected to the base of the transistor Q2. The second voltage control module 22 includes a transistor Q1 and a diode D5. The transistor Q1 is electrically connected between the resistor R51 and the inductor L2, and the diode D5 is electrically connected to the base of the transistor Q1.

[0026] That is, the voltage in the circuit is controlled by the first voltage control module 12 and the second voltage control module 22. When the current passes through the collector and the emitter, the user can accurately adjust the current through the corresponding transistor Q1 or transistor Q2, thereby adjusting the voltage intensity, thereby providing an adjustment function for the output audio and a control function for the balance of different audio outputs. The voltage in the circuit is muted by the diode D5 and the diode D6. When the voltage reaches a preset condition, the signal can be turned off, thereby achieving a muting function for part or all of the audio.

[0027] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical concepts disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. The mixing output circuit of the active speaker is characterized by: include: A first signal coupling module (10) and a second signal coupling module (20) for amplifying a signal; One side of the first signal coupling module (10) is electrically connected to a first signal stabilization module (11), one side of the first signal stabilization module (11) is electrically connected to a first voltage control module (12), and one side of the first voltage control module (12) is connected to a first filtering module (13); One side of the second signal coupling module (20) is electrically connected to a second signal stabilization module (21), one side of the second signal stabilization module (21) is electrically connected to a second voltage control module (22), and one side of the second voltage control module (22) is connected to a second filtering module (23); An output interface (30), the other side of the first filter module (13) and the second filter module (23) are electrically connected to the output interface (30).

2. The active speaker mixing output circuit according to claim 1, characterized in that: The first signal coupling module (10) comprises a resistor R22, a resistor R23, a capacitor C18, and an amplifier U2B, wherein the resistor R22 is connected in series with the amplifier U2B, and the resistor R23 and the capacitor C18 are connected in parallel to both sides of the amplifier U2B; The second signal coupling module (20) comprises a resistor R28, a resistor R30, a capacitor C51, and an amplifier U2A. The resistor R28 is connected in series with the amplifier U2A and the amplifier U2B. The resistor R30 and the capacitor C51 are connected in parallel to both sides of the amplifier U2A.

3. The mixing output circuit of the active speaker according to claim 2, characterized in that: The first signal stabilization module (11) includes a capacitor C19 and a resistor R50, one side of the capacitor C19 is electrically connected to the amplifier U2B, and the other side of the capacitor C19 is electrically connected to the resistor R50. The second signal stabilization module (21) includes a capacitor C20 and a resistor R51, one side of the capacitor C20 is electrically connected to the amplifier U2A, and the other side of the capacitor C20 is electrically connected to the resistor R50.

4. The active speaker mixing output circuit according to claim 3, characterized in that: The first filtering module (13) includes an inductor L1, a capacitor C2, and a resistor R52, wherein the resistor R50 is sequentially connected in series with the inductor L1, the capacitor C2, and the resistor R52. The first filtering module (13) includes an inductor L2, a capacitor C5, and a resistor R53, wherein the resistor 51 is sequentially connected in series with the inductor L2, the capacitor C5, and the resistor R53. The other side of the resistor R53 is electrically connected to pin 2 of the output interface, and the other side of the resistor R52 is electrically connected to pin 3 of the output interface.

5. The active speaker mixing output circuit according to claim 4, characterized in that: The first voltage control module (12) includes a transistor Q2 and a diode D6, wherein the collector of the transistor Q2 is electrically connected between the resistor R50 and the inductor L1, and the diode D6 is electrically connected to the base of the transistor Q2. The second voltage control module (22) includes a transistor Q1 and a diode D5, wherein the transistor Q1 is electrically connected between the resistor R51 and the inductor L2, and the diode D5 is electrically connected to the base of the transistor Q1.

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