CN219269061U

CN219269061U - Audio distributor

Info

Publication number: CN219269061U
Application number: CN202220781871.1U
Authority: CN
Inventors: 李现峰; 魏宏惠; 魏宏茹
Original assignee: Beijing Jinsanhui Technology Co ltd
Current assignee: Beijing Jinsanhui Technology Co ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2023-06-27
Anticipated expiration: 2032-04-06

Abstract

The utility model relates to an audio distributor comprising: the port conversion circuit is connected with a plurality of input ends in parallel; the power amplifier circuit filters noise except the sound signal and amplifies the sound signal; the digital mixing filter is used for carrying out mixing processing on the sound data signals and filtering out differential signals with different frequencies; an audio processor for automatically compressing the audio frequency of the synthesized sound signal to change the audio output effect; the port conversion circuit, the power amplifier circuit, the digital mixing filter and the audio processor are electrically connected in sequence. The audio distributor can integrate the sounds of different audio signals at the input end, amplify the sound signals through the power amplification circuit, mix the sound signals through the digital mixing filter, and automatically compress the audio frequency of the integrated sound signals of the audio processor so as to improve the audio output effect, make the sound of the audio terminal round and prevent the sound distortion.

Description

Audio distributor

Technical Field

The present utility model relates to a multimedia control system, and more particularly, to an audio distributor.

Background

The power amplifier is called a sound amplifier, which is a basic device in sound system, and the task of the power amplifier is to amplify weak electric signal from signal source (sound console in professional sound system) to drive the loudspeaker to make sound.

The current power amplification principle adopts a structure mode of several inputs and several outputs, namely, the input audio signal corresponds to the signal output and is a structure combining one path. Such as two in and two out: the computer signal input end all the way, the piano signal input end all the other end connects the output of audio amplifier, when computer and musical instrument combine, two kinds of sound have appeared, and the loudspeaker sound of computer mixes more chaotic with the loudspeaker sound of musical instrument together, and the noise is great, and the audio frequency effect is poor.

Disclosure of Invention

The utility model provides a noise-reducing audio distributor for improving audio effect.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an audio dispenser comprising:

the port conversion circuit is connected with a plurality of input ends in parallel so as to convert the differential signal port of each input end and the single-ended signal port in a balanced way;

the power amplifier circuit is used for filtering noise except the sound signal and amplifying the sound signal;

the digital mixing filter is used for carrying out mixing processing on the sound digital signals and filtering out differential signals with different frequencies;

the audio processor is used for automatically compressing the audio frequency of the synthesized sound signal, so that the audio output effect is changed, and the smoothness of the sound is ensured;

the port conversion circuit, the power amplifier circuit, the digital mixing filter and the audio processor are electrically connected in sequence.

As a further improvement, the audio processor is connected with a noise reduction processing circuit, the noise reduction processing circuit is connected with an audio terminal, and according to the result of sound processing, the sliding resistance in the noise reduction processing circuit changes the resistance value so as to adjust the current, and the processed sound signal is output along the audio terminal.

As a further improvement, the power amplifier circuit is an audio amplifier circuit, and the audio amplifier circuit comprises an amplifier, and a capacitor and a resistor which are connected to two ends of the amplifier and are used for amplifying an audio signal, and the capacitor and the resistor form a filter so as to enable the frequency response to be straight.

As a further improvement, the digital mixing filter comprises a transistor, and the output end of the transistor is connected with a capacitor and a resistor to form an LC decoupling circuit for filtering differential signals with different frequencies and performing audio compression.

As a further improvement, the audio processor is provided with 8 pins, wherein the pin at the top end is connected with a power supply, the pin at the bottom end is grounded, two groups of input ends are formed at the left end, two output ends are formed at the right end, each group of input ends corresponds to one output end, and each output end is correspondingly connected to the noise reduction processing circuit.

As a further improvement, each group of the input terminals comprises a forward input terminal and a reverse input terminal, wherein the forward input terminal is connected with the sliding resistor, and the reverse input terminal is connected with the working voltage terminal.

As a further improvement, the plurality of input ends electrically connected in parallel at the port conversion circuit comprise a microphone input end, a piano input end and a computer input end.

As a further improvement, the power amplifier circuit is connected with a signal power supply to supply power to the circuit.

The technical scheme of the utility model has the following beneficial effects: the audio distributor can integrate the sounds of different audio signals at the input end, filters noise except the sound signals through the power amplification circuit, amplifies the sound signals to enable the frequency response to be flat, carries out mixing processing on the sound data signals through the digital mixing filter, filters out differential signals with different frequencies, and carries out automatic compression processing on the audio frequency of the integrated sound signals of the audio processor, so that the audio output effect is improved, and the sound entering the audio terminal is round and smooth, and prevents the sound distortion.

Drawings

Fig. 1 is a schematic block diagram of an audio distributor according to the present utility model.

Fig. 2 is a schematic circuit diagram of an audio splitter of the present utility model.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 1 to 2, an audio distributor includes a port conversion circuit, where a plurality of input terminals are connected in parallel to balance and convert a differential signal port and a single-ended signal port of each input terminal. Specifically, the plurality of input ends electrically connected in parallel at the port conversion circuit comprise a microphone input end, a piano input end, a computer input end and the like, signals output by the piano are MIDI signals, signals output by the computer are AUDIO signals, the sound signals of the microphone are converted into electric signals, a plurality of sounds are fused together, the AUDIO signals of a plurality of input ends enter simultaneously and exit simultaneously, and the signals of each input end are different and do not interfere with each other. In this embodiment, the input end is designed into two paths, the number of paths of the input end can be designed according to actual needs, several paths of signals are output, and several paths of signals can be overlapped and fused together.

Referring to fig. 2 in combination, each input end includes a first branch and a second branch connected in parallel with the first branch, the first branch includes a first capacitor and a first resistor connected in series with the first capacitor, the second branch includes a second capacitor and a second resistor connected in series with the second capacitor, and the second resistor is connected in parallel with the first resistor and then connected to the power amplifier circuit. In this embodiment, the first capacitor is C3 or C7 shown in fig. 2, the first resistor is R3 or R7 shown in fig. 2, the second capacitor is C4 or C8 shown in fig. 2, and the second resistor is R4 or R8 shown in fig. 2.

The power amplifier circuit is used for filtering noise except the sound signal and amplifying the sound signal; the power amplifier circuit is an audio amplifier circuit, the audio amplifier circuit is divided into two groups connected in parallel, each group comprises an amplifier, and a capacitor and a resistor which are connected in parallel at two ends of the amplifier to form a decoupling circuit so as to eliminate parasitic coupling between circuit networks, and the audio amplifier circuit amplifies an audio signal, and the capacitor and the resistor form a filter so as to lead the frequency response to be straight.

Specifically, the power amplifier circuit is connected with a signal power supply to supply power to the circuit. In some embodiments, the amplifier is U1 shown in fig. 2, and the capacitance and resistance connected in parallel across the amplifier are C6 and R6 shown in fig. 2, where the two sets of audio amplifying circuits are identical. In some embodiments, U1 employs an LM358 type amplifier.

The digital mixing filter is used for carrying out mixing processing on the sound digital signals and filtering out differential signals with different frequencies; the digital mixing filter is two groups of low-pass filters, each group of low-pass filters comprises two crystal triodes, the output end of each crystal triode is connected with a capacitor and a resistor to form an LC decoupling circuit, and the LC decoupling circuit is used for filtering out high-frequency differential signals so that an acoustic horn can obtain an acoustic frequency communication alternating current data signal and perform audio compression.

In some embodiments, two transistors in one set of low-pass filters are BG1 and BG2 in fig. 2, the capacitor and the resistor connected to the output of one transistor BG1 are C22 and R27, the capacitor and the resistor connected to the output of the other transistor BG2 are C25 and R19, and two diodes are connected to the two ends of the low-pass filter, and the two diodes are connected in parallel and then connected to a resistor, a capacitor, and are connected to one output of the audio processor, see D2, D1, R21, and C26 in fig. 2.

Two transistors in the other group of low-pass filters are BG3 and BG4 in fig. 2, a capacitor and a resistor connected to the output end of one transistor BG3 are C9 and R28 correspondingly, a capacitor and a resistor connected to the output end of the other transistor BG2 are C18 and R20 correspondingly, two ends of the low-pass filter are connected with diodes correspondingly, and after the two diodes are connected in parallel, the two diodes are connected with a resistor, a capacitor and connected to the other output end of the audio processor, please refer to D3, D4, R22 and C27 in fig. 2.

The audio processor is U2 in the circuit diagram of FIG. 2, and is used for automatically compressing the audio frequency of the synthesized sound signal, so as to change the audio output effect, ensure the smoothness of the sound and prevent the distortion of the sound, and is connected with a noise reduction processing circuit; the U2 is provided with 8 pins, wherein the pins at the top end are connected with a power supply, the pins at the bottom end are grounded, two groups of input ends are formed at the left end, two output ends are formed at the right end, and each group of input ends corresponds to one output end.

Specifically, in some embodiments, each set of input terminals includes a forward input terminal connected to a potentiometer or a sliding resistor or an adjustable resistor, i.e., W1 in fig. 2, and a reverse input terminal connected to an operating voltage terminal, i.e., EC4 or EC5 in the drawing, each output terminal being correspondingly connected to a noise reduction processing circuit. In this embodiment, U2 is an audio processor with model number TDA 2822M.

One end of the noise reduction processing circuit is connected with an audio terminal, the resistance value is changed through the sliding resistor according to the result of sound processing, the current is adjusted, the processed sound signal is output along the audio terminal, sound distortion is prevented, sound is enabled to be round, and in the embodiment, the audio terminal is an earphone.

The audio distributor can be used for digital music teaching scenes, when the sounds of different audio signals of a plurality of input ends are fused together, the audio signals of a plurality of input ends are input simultaneously and output simultaneously, the signals of the input ends are different and do not interfere with each other, noise except the sound signals is filtered through a power amplification circuit, the sound signals are amplified, so that the frequency response is straight, a digital mixing filter carries out mixing processing on the sound data signals, differential signals with different frequencies are filtered, an audio processor synthesizes the audio frequencies of the sound signals to carry out automatic compression processing, the audio output effect is improved, and the sound entering an audio terminal is round and smooth, and the sound distortion is prevented.

In summary, the audio distributor of the utility model can integrate the sound of different audio signals at the input end, filter the noise except the sound signal through the power amplifier circuit, amplify the sound signal to make the frequency response straight, the digital mixing filter carries out mixing processing on the sound data signal, filter out differential signals of different frequencies, the audio processor synthesizes the sound frequency of the sound signal to carry out automatic compression processing, so as to improve the audio output effect, and the sound entering the audio terminal is round and smooth and prevent the sound distortion.

The above examples are merely illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.

Claims

1. An audio dispenser, characterized by: comprising the following steps:

2. The audio distributor of claim 1, wherein: the audio processor is connected with a noise reduction processing circuit, the noise reduction processing circuit is connected with an audio terminal, and according to the result of sound processing, the sliding resistance in the noise reduction processing circuit changes the resistance value so as to adjust the current, and the processed sound signal is output along the audio terminal.

3. The audio distributor of claim 2, wherein: the power amplifier circuit is an audio amplifier circuit, and the audio amplifier circuit comprises an amplifier, and a capacitor and a resistor which are connected to two ends of the amplifier and are used for amplifying an audio signal, and the capacitor and the resistor form a filter so as to enable frequency response to be straight.

4. An audio dispenser according to claim 3, characterized in that: the digital mixing filter comprises a transistor, wherein the output end of the transistor is connected with a capacitor and a resistor to form an LC decoupling circuit, and the LC decoupling circuit is used for filtering differential signals with different frequencies and performing audio compression.

5. The audio distributor of claim 1, wherein: the audio processor is provided with 8 pins, wherein the pins at the top end are connected with a power supply, the pins at the bottom end are grounded, two groups of input ends are formed at the left end, two output ends are formed at the right end, each group of input ends corresponds to one output end, and each output end is correspondingly connected to the noise reduction processing circuit.

6. The audio distributor of claim 5, wherein: each group of input ends comprises a forward input end and a reverse input end, wherein the forward input end is connected with the sliding resistor, and the reverse input end is connected with the working voltage end.

7. The audio distributor of claim 1, wherein: the port conversion circuit is characterized in that a plurality of input ends connected in parallel comprise a microphone input end, a piano input end and a computer input end.

8. An audio dispenser according to claim 3, characterized in that: the power amplifier circuit is connected with a signal power supply to supply power to the circuit.