CN223219203U - Sound mixing output circuit of active sound box - Google Patents

Abstract

The present invention relates to the technical field of active speaker output control, and in particular to a mixing output circuit for an active speaker, comprising: a first signal coupling module and a second signal coupling module for amplifying a signal, and an output interface, wherein 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 electrically 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, and one side of the second voltage control module is connected to a second filtering module. The present invention can perform branching processing on input signals and perform noise reduction filtering on the first signal coupling module and the second signal coupling module, and finally achieve mixed output of audio from multiple sources.

Description

Sound mixing output circuit of active sound box

Technical Field

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.

Background

Active speakers generally refer to an integrated body into which a power drive unit and a collection of passive speakers are integrated. In the design of an active sound box, in order to meet the richness of output audio, multi-source audio mixing output is usually set, but when the audio mixing variety is too many, the audio frequencies of all sources can mutually influence, and the influence can possibly cause noise, namely, the problem that the finally output audio frequency generates obvious noise, so that the final output effect of the audio mixing output is seriously influenced, and in order to solve the problem, the need of providing an audio mixing output circuit of the active sound box is urgent.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model provides the following technical scheme:

The audio mixing output circuit of the active sound box comprises a first signal coupling module, a second signal coupling module and an output interface, wherein the first signal coupling module and the second signal coupling module are used for amplifying signals.

Specifically, one side electric connection of first signal coupling module has first signal stabilization module, one side electric connection of first signal stabilization module has first voltage control module, one side of first voltage control module is connected with first filter module, one side electric connection of second signal coupling module has second signal stabilization module, one side electric connection of second signal stabilization module has second voltage control module, one side of second voltage control module is connected with second filter module, the opposite side and the output interface electric connection of first filter module and second filter module.

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, where the resistor R22 is connected in series with the amplifier U2B, the resistor R23 and the capacitor C18 are connected in parallel to two sides of the amplifier U2B, and the second signal coupling module includes a resistor R28, a resistor R30, a capacitor C51, and an amplifier U2A, where 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 two sides of the amplifier U2A.

As an improvement of the above technical solution, the first signal stabilizing module includes a capacitor C19 and a resistor R50, one side of the capacitor C19 is electrically connected to the amplifier U2B, the other side of the capacitor C19 is electrically connected to the resistor R50, the second signal stabilizing 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.

As an improvement of the above technical solution, the first filtering module includes an inductor L1, a capacitor C2, and a resistor R52, where the resistor R50 is sequentially connected in series with the inductor L1, the capacitor C2, and the resistor R52, the first filtering module includes an inductor L2, a capacitor C5, and a resistor R53, where the resistor 51 is sequentially connected in series with the inductor L2, the capacitor C5, and the resistor R53, and the other side of the resistor R53 is electrically connected with a second pin of the output interface, and the other side of the resistor R52 is electrically connected with a third pin of the output interface.

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

The utility model has the beneficial effects that:

The input signals can be subjected to branching treatment through the first signal coupling module and the second signal coupling module, noise reduction and filtering are performed, finally, audio mixing output of multiple sources is realized, noise and distortion in the signals are reduced through the amplifier U2A and the amplifier U2B, the signals are further filtered through the relevant modules such as the first signal stabilizing module, the final output effect is balanced, and the overall audio output effect is improved.

Drawings

Fig. 1 is a diagram of a mixing output circuit of the present utility model;

fig. 2 is a schematic diagram of connection positions between a mixing output circuit of the present utility model and a control circuit of an active speaker according to the prior art.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.

When the mixing types are too many, the audio of each source can mutually influence, and the influence can cause noise, namely the problem that obvious noise appears in the finally output audio, so that the final output effect of the mixing output is seriously influenced.

In order to solve the above-mentioned problems, please refer to fig. 1, a mixing output circuit of an active speaker is provided for amplifying signals, a first signal coupling module 10, a second signal coupling module 20 and an output interface 30.

Specifically, one side of the first signal coupling module 10 is electrically connected with the first signal stabilizing module 11, one side of the first signal stabilizing module 11 is electrically connected with the first voltage control module 12, one side of the first voltage control module 12 is connected with the first filtering module 13, one side of the second signal coupling module 20 is electrically connected with the second signal stabilizing module 21, one side of the second signal stabilizing module 21 is electrically connected with the second voltage control module 22, one side of the second voltage control module 22 is connected with the second filtering module 23, and the other sides of the first filtering module 13 and the second filtering module 23 are electrically connected with the output interface 30.

The input signals are processed through the first signal coupling module 10 and the second signal coupling module 20, the direct current part is mainly prevented, the alternating current signals are allowed to pass through, so that important characteristics of audio are reserved, the voltage states in the circuit are controlled through the first voltage control module 12 and the second voltage control module 22, the functions of controlling the amplification and switching of the audio signals are achieved, the output audio signals are filtered through the first filtering module 13 and the second filtering module 23, and the fact that the output result of the output interface 30 is balanced and stable is guaranteed.

Specifically, referring to fig. 1, 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, the resistor R23 and the capacitor C18 are connected in parallel to two 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 two sides of the amplifier U2A.

The input impedance is adjusted through the resistor R22, the resistor R28 and the resistor R23, signals are coupled through the capacitor C18 and the capacitor C51, stable transmission of the signals is facilitated, direct current bias is prevented, the signals are amplified through the amplifier U2A and the amplifier U2B, the configuration is carried out according to the conditions of the resistor R22, the resistor R28, the resistor R23, the capacitor C18 and the capacitor C51, and the gain and the frequency response are determined.

In one embodiment, referring to fig. 1, specifically, the first signal stabilizing module 11 includes a capacitor C19 and a resistor R50, one side of the capacitor C19 is electrically connected to the amplifier U2B, the other side of the capacitor C19 is electrically connected to the resistor R50, the second signal stabilizing 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.

The input signal is further stabilized and adjusted by the capacitor C19 and the capacitor C20, and is input to the first filtering module 13 and the second filtering module 23 for filtering, and a specific filtering scheme is as follows:

The first filter module 13 includes an inductor L1, a capacitor C2, and a resistor R52, the resistor R50 is sequentially connected in series with the inductor L1, the capacitor C2, and the resistor R52, the first filter module 13 includes an inductor L2, a capacitor C5, and a resistor R53, 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 with the second pin of the output interface, and the other side of the resistor R52 is electrically connected with the third pin of the output interface.

Namely, the low-pass filtering state is formed by the electronic components in the first filtering module 13 and the second filtering module 23 (namely, the inductor L1, the capacitor C2, the resistor R52, the inductor L2, the capacitor C5 and the resistor R53 form a low-pass filter), so that the low-frequency signal in the input signal is filtered, and the stability of the finally output signal is ensured.

In order to further ensure the controllability of the audio mixing output, referring to fig. 1, the first voltage control module 12 includes a transistor Q2 and a diode D6, a collector of the transistor Q2 is electrically connected between a resistor R50 and an inductor L1, the diode D6 is electrically connected with a 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 a resistor R51 and the inductor L2, and the diode D5 is electrically connected with a base of the transistor Q1.

Namely, the voltage conditions in the circuit are controlled by the first voltage control module 12 and the second voltage control module 22, when current passes through the collector and the emitter, a user can accurately adjust the current flowing through the corresponding transistor Q1 or the transistor Q2 so as to adjust the intensity of the flowing voltage, thereby providing an adjusting function for outputting audio, providing a control function for balancing different audio outputs, providing mute control for the voltage in the circuit by the diode D5 and the diode D6, and turning off the signal when the voltage reaches the preset condition, so as to realize the mute function of partial audio or all audio.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (5)

1. The mixing output circuit of the active speaker is characterized by comprising: 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 mixing output circuit of the active speaker according to claim 1, characterized in that: 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) 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 is 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 mixing output circuit of the active speaker according to claim 3 is characterized in that: the first filtering module (13) 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 (13) 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. 5. The mixing output circuit of the active speaker according to claim 4 is characterized in that: the 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.