CN218301627U - Sound amplification circuit and intelligent screen - Google Patents

Abstract

The utility model provides a public address circuit and wisdom screen relates to sound processing technical field. The sound amplifying circuit comprises a connector, a differential-to-single-ended module, an audio power amplifier module and a loudspeaker, wherein the connector is used for receiving audio signals collected by a microphone to generate differential analog signals, the input end of the differential-to-single-ended module is connected with the signal output end of the connector, the output end of the differential-to-single-ended module is connected with the input end of the audio power amplifier module, the output end of the audio power amplifier module is connected with the loudspeaker, the differential-to-single-ended module is used for converting the audio signals from the differential analog signals into the single-ended analog signals, the audio power amplifier module is used for receiving the single-ended analog signals and amplifying the audio signals, and the loudspeaker is used for playing the amplified audio signals. In this public address circuit and wisdom screen, the audio signal that the microphone gathered carries out signal conversion through connector and difference commentaries on classics single-ended module, and whole process is analog signal, need not analog-to-digital conversion, and the time delay is low and signal fidelity is high.

Description

Sound amplification circuit and intelligent screen

Technical Field

The utility model relates to a sound processing structure technical field especially relates to a public address circuit and wisdom screen.

Background

With the development of digital information, the field of education such as schools began to be digitally modified for better development of digitization. Use the wisdom blackboard as the example, gather user's sound and play away through the public address device to improve the diffusion region of sound, facilitate for education.

In the field of sound reinforcement, the requirement on delay is high, and particularly in the field of education, the high delay can have great influence on teaching. At present common public address device handles and expands the sound to external microphone based on the built-in treater of wisdom screen, and this kind of mode can bring the time delay higher, and pronunciation also can produce certain distortion.

SUMMERY OF THE UTILITY MODEL

The utility model provides a public address circuit and wisdom screen for solve among the prior art public address device time delay height, can produce the defect of distortion.

The utility model provides a public address circuit, change single-ended module, audio power amplifier module and speaker including connector, difference, the connector is used for receiving the audio signal that the microphone was gathered in order to produce difference analog signal, the difference change single-ended module the input with the signal output part of connector links to each other, the difference change single-ended module the output with the input of audio power amplifier module links to each other, the output of audio power amplifier module with the speaker links to each other, the difference changes single-ended module and is used for converting audio signal from difference analog signal to single-ended analog signal, audio power amplifier module is used for receiving single-ended analog signal amplifies audio signal, the speaker is used for playing the audio signal after enlargiing.

According to the utility model provides a pair of sound amplifying circuit, the connector includes four ports, wherein two the left channel differential pair signal is constituteed to the port, two in addition the right channel differential pair signal is constituteed to the port.

According to the utility model provides a pair of sound amplifying circuit still includes external volume control module, volume control module is used for adjusting analog signal's volume.

According to the utility model provides a pair of amplifying circuit, the speaker includes left channel unit and right channel unit, left channel unit with right channel unit respectively with audio power amplifier module communication connection. According to the utility model provides a pair of sound amplification circuit still includes simulation sound mixing module and host processor, the host processor is used for acquireing audio data, simulation sound mixing module be used for with audio data with the single-ended analog signal that single-ended module output was changeed to the difference carries out the sound mixing and handles.

According to the utility model provides a pair of public address circuit, the simulation audio mixing module is the adder, the output of adder with audio power amplifier module links to each other.

According to the utility model provides a pair of sound amplifying circuit, the host processor includes digital analog conversion module, audio data is digital signal, digital signal via after the digital analog conversion module conversion with the input of simulation audio mixing module links to each other.

According to the utility model provides a pair of sound amplifying circuit still includes analog-to-digital conversion module, analog-to-digital conversion module is used for receiving the audio signal that the microphone gathered and changes it into digital signal.

The embodiment of the utility model provides a still provide a wisdom screen, include as above the public address circuit.

According to the utility model discloses the wisdom screen that provides, wisdom screen includes screen and microphone, the speaker sets up the side of screen, the microphone with connector communication connection.

The utility model provides a public address circuit and wisdom screen, the audio signal that the microphone was gathered changes single-ended module through connector and difference and carries out signal conversion, and whole process is analog signal, need not analog-to-digital conversion, and the time delay is low and signal fidelity is high.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an acoustic amplification circuit provided by the present invention;

fig. 2 is a schematic interface diagram of a connector provided by the present invention;

fig. 3 is a schematic structural diagram of a differential-to-single-ended module provided by the present invention;

fig. 4 is a schematic structural diagram of the analog mixing module provided by the present invention.

Reference numerals are as follows:

10. a connector; 20. a differential-to-single-ended module; 30. a volume adjustment module; 40. a simulation sound mixing module; 50. an audio power amplifier module; 60. a speaker; 70. a main processor; 71. an analog-to-digital conversion module; 72. and a digital-to-analog conversion module.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The features of the terms first and second in the description and in the claims of the present invention may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The intelligent screen is like the intelligent blackboard, combines together traditional chalk writing blackboard and multimedia device, can easily switch between chalk writing blackboard and multimedia application. The intelligent blackboard can be written by chalk like a common blackboard, and can also be used for watching various rich multimedia applications such as ppt videos, pictures, animations and the like by hand touch. The wisdom blackboard can transcribe blackboard writing content and pronunciation transcription in real time, when using the wisdom blackboard, receives the sound with the help of the microphone, records the course in real time and/or plays video course outward. The collected sound signals are amplified through the processor and then output, delay and distortion can occur in the whole processing process, the using effect is influenced, and the teaching quality is greatly influenced.

The sound amplifying circuit of the present invention will be described with reference to fig. 1 to 4.

The embodiment of the utility model provides a public address circuit, as shown in fig. 1, it includes connector 10, difference changes single-ended module 20, audio power amplifier module 50 and speaker 60. The connector 10 is configured to receive an audio signal collected by a microphone to generate a differential analog signal, an input end of the differential-to-single-ended module 20 is connected to a signal output end of the connector 10, an output end of the differential-to-single-ended module 20 is connected to an input end of the audio power amplifier module 50, and an output end of the audio power amplifier module 50 is connected to the speaker 60. The differential-to-single-ended module 20 is configured to convert the audio signal from a differential analog signal to a single-ended analog signal, the audio power amplifier module 50 is configured to receive the single-ended analog signal and amplify the audio signal, and the speaker 60 is configured to play the amplified audio signal.

Wherein the microphone captures an audio signal of the user. The connector 10 receives an audio signal picked up by a microphone to generate a differential analog signal. In an optional embodiment, the connector 10 has four interfaces, two of the interfaces are used as a left channel, the other two interfaces are used as a right channel, and the audio signals collected by the microphones are multiplexed into two parts and then respectively accessed from the left channel and the right channel to form a left channel differential pair signal and a right channel differential pair signal. In yet another alternative embodiment, the connector 10 has only two interfaces, forming either a left channel differential pair signal or a right channel differential pair signal. The connector 10 converts the audio signal collected by the microphone into a differential analog signal, and adopts fully differential wiring to enhance the anti-interference capability of the audio.

The differential-to-single-ended module 20 is used to convert the differential analog signal into a single-ended analog signal. Since the external microphone is at a certain distance from the motherboard, and the input interface of the motherboard is single-ended input, the mode conversion is performed by the differential-to-single-ended module 20, and then the single-ended output is performed. Specifically, the differential-to-single-ended module 20 includes an operational amplifier, and the differential pair signal output by the connector 10 is converted into a single-ended analog signal after passing through the operational amplifier. Thus, the differential-to-single-ended module 20 is used to convert the signals into single-ended analog signals for interfacing with the motherboard. The audio power amplifier module 50 is an integrated circuit, and amplifies the power of the processed audio signal, and then outputs the amplified audio signal through the speaker 60.

Taking the smart blackboard as an example, the external microphone collects the lecture sound of the teacher and the speech sound of the student, the audio signal collected by the microphone is converted into a differential analog signal through the connector 10, for the convenience of communication with the main processor 70 on the smart blackboard, the differential-to-single-ended module 20 is converted into a single-ended analog signal, and the single-ended analog signal output by the differential-to-single-ended module 20 is amplified by the audio power amplifier module 50 and then played from the speaker 60. In the whole process, the audio signal is transmitted in the form of an analog signal, so that the time delay and distortion of the audio signal are avoided while the playing sound is expanded.

The embodiment of the utility model provides a public address circuit, the audio signal that the microphone was gathered changes single-ended module 20 through connector 10 and difference and carries out signal conversion, and whole process is analog signal, need not analog-to-digital conversion, and the time delay is low and signal fidelity is high.

In one embodiment, the connector 10 includes four ports, two of which constitute a right channel differential pair signal and two of which constitute a left channel differential pair signal.

As shown in FIG. 2, the connector 10 is a 4pin interface, which is an R-P terminal, an R-N terminal, an L-P terminal and an L-N terminal. The R-P end and the R-N end form a right channel differential pair signal, and the L-P end and the L-N end form a left channel differential pair signal.

The utility model provides a public address circuit adopts connector 10 transmission stereo analog signal, and the fully differential mode, and the interference killing feature is strong.

Specifically, as shown in fig. 1 and fig. 3, the sound amplifying circuit further includes an external volume adjusting module 30, and the volume adjusting module 30 is configured to adjust the volume of the single-ended analog signal.

The volume adjusting module 30 is implemented by an integrated circuit, and is disposed on an external remote controller or on an operation panel of the smart screen. The volume adjusting module 30 adjusts the volume of the single-ended analog signal, and when the volume adjusting module is disposed on an external remote controller, a control interface is disposed inside the volume adjusting module for dynamically controlling the volume adjustment of the single-ended analog signal.

Optionally, the volume adjusting module 30 is an NJU72341 of JRC, and the volume is adjusted by configuring a register through an I2C interface.

In the sound amplifying circuit provided by the embodiment of the present invention, the volume adjusting module 30 is used to adjust the volume of the analog signal, and the volume can be dynamically adjusted. The volume adjusting module 30 adopts JRC NJU72341, which can be externally arranged, and is convenient for the user to remotely control.

In an embodiment of the present invention, the sound amplifying circuit further includes an analog mixing module 40 and a main processor 70. The main processor 70 is configured to obtain audio data, and the analog audio mixing module 40 is configured to perform audio mixing processing on the audio data and the single-ended analog signal output by the differential-to-single-ended module 20.

The analog mixing module 40 is an integrated circuit, and in an optional embodiment, the main processor 70 includes a processing unit and a storage unit, the storage unit stores audio data therein, and the processing unit obtains the audio data from the storage unit. In yet another alternative embodiment, the main processor 70 is communicatively coupled to an external server to retrieve audio data stored by the external server. Optionally, the audio data is a digital signal, the main processor 70 includes a digital-to-analog conversion module 72, the built-in audio is converted into an analog signal by the digital-to-analog conversion module 72, and then the analog signal of the built-in audio and the single-ended analog signal collected by the microphone are mixed by the analog mixing module 40, so that the built-in audio and the audio signal collected by the microphone are played by the speaker 60. In yet another alternative embodiment, the audio data is analog signals that are directly input to the analog mixing module 40 for mixing with the audio signals collected by the microphones.

The main processor 70 is communicatively coupled to the volume adjustment module 30, and controls the operation of the volume adjustment module 30 via the main processor. It should be noted that, in the case that the sound amplifying circuit includes the analog mixing module 40, the audio adjusting module 30 is further configured to adjust the volume of the audio data.

Specifically, the analog mixing module 40 includes an operational amplifier, which uses an adder to perform mixing operation of two audio frequencies, and since the analog mixing module 40 processes an analog signal, the delay and distortion of the signal are not caused.

As shown in fig. 4, the audio signal output by the volume adjusting module 30 is used as one input signal of the adder, and the audio signal output by the main processor 70 is used as the other input signal of the adder, and the audio signal is output by the adder and is synchronously amplified by the audio power amplifying module 50.

Use the wisdom screen as an example, the teacher when playing the video course, need the teacher to explain the video course, gather teacher's sound through the microphone, with the help of the sound mixing module 40 mixed video course of simulation and teacher's sound, via the content that speaker 60 broadcast video course and teacher explained in step to simulate teaching scene more vividly, make things convenient for the teacher to explain while playing the video course.

The embodiment of the utility model provides a public address circuit through the mode that the simulation is direct-through, carries out the design of public address function, has realized the function of simulation audio mixing, carries out the audio mixing with the built-in audio frequency that host processor 70 established and the outside audio frequency that the microphone gathered.

Further, the sound amplifying circuit further comprises an analog-to-digital conversion module 71, and the analog-to-digital conversion module 71 is configured to receive the audio signal collected by the microphone to convert the audio signal into a digital signal. In an alternative embodiment, as shown in FIG. 1, the analog-to-digital conversion module 71 is integrated within the main processor 70. In yet another alternative embodiment, the analog-to-digital conversion module 71 is independent of and in communication with the main processor 70.

Specifically, the analog-to-digital conversion module 71 receives an audio signal collected by a microphone, converts the audio signal into a digital signal, and facilitates voice transcription and recognition so as to display a voice caption on a screen.

The embodiment of the utility model provides a public address circuit, treater are equipped with analog-to-digital conversion module 71, borrow by the audio signal that analog-to-digital conversion module 71 received the microphone and gathered for carry out speech recognition or pronunciation transcription, conveniently carry out other speech processing.

The embodiment of the utility model provides a still provide a wisdom screen, it includes as above the public address circuit.

The wisdom screen is used for occasions such as teaching and meeting to the wisdom blackboard of teaching usefulness is the example, and teacher's sound is gathered to the microphone, converts differential analog signal into through connector 10, and converts single-ended analog signal into through the difference, and single-ended analog signal adjusts the audio signal size that the microphone was gathered under volume control module 30's effect, plays from speaker 60 after perhaps directly amplifying through audio power amplifier module 50 via simulation audio mixing module 40. Under the condition that two kinds of sound are played synchronously, the two kinds of sound are mixed by the analog sound mixing module 40, input into the audio power amplification module 50 and then output from the loudspeaker 60.

Optionally, the speaker 60 includes two units, which are a right channel unit and a left channel unit, and the left channel unit and the right channel unit are respectively in communication connection with the audio power amplifier module, so as to play stereo sound.

The embodiment of the utility model provides a wisdom screen adopts as above the public address circuit, the audio signal that the microphone was gathered is whole for analog signal before speaker 60 broadcast, ensures that the audio signal of gathering can not take place distortion and time delay.

In one embodiment, the smart screen includes a screen and a microphone, with the speaker 60 being disposed on the side of the screen, the microphone being in communication with the connector 10.

In an alternative embodiment, the speaker 60 is mounted with the screen on a single housing. Of course, the speaker 60 is provided independently of the screen, and it may be provided separately at the side of the screen or at the rear of the screen or spaced apart from the screen as necessary in order to adjust the position of the speaker 60 as necessary.

Specifically, the speakers 60 may be provided simultaneously on the left and right sides of the screen.

The microphone is a handheld pickup device or an ear-hanging pickup device and adopts a wireless structure. When the wireless microphone is used, the microphone can be used for picking up while walking, and the use is convenient.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a sound amplifying circuit, its characterized in that includes connector, difference change single-ended module, audio power amplifier module and speaker, the connector is used for receiving the audio signal that the microphone was gathered in order to produce difference analog signal, the input of difference change single-ended module with the signal output part of connector links to each other, the output of difference change single-ended module with the input of audio power amplifier module links to each other, the output of audio power amplifier module with the speaker links to each other, difference change single-ended module and be used for with audio signal from difference analog signal conversion to single-ended analog signal, the audio power amplifier module is used for receiving single-ended analog signal and enlargies audio signal, the speaker is used for playing the audio signal after the enlargiing.

2. The sound amplification circuit of claim 1, wherein the connector comprises four ports, two of the ports comprising a left channel differential pair signal and two of the ports comprising a right channel differential pair signal.

3. The acoustic amplification circuit of claim 1, further comprising an external volume adjustment module, wherein the volume adjustment module is configured to adjust the volume of the single-ended analog signal.

4. The sound amplifying circuit according to claim 1, wherein the speaker comprises a left channel unit and a right channel unit, and the left channel unit and the right channel unit are respectively connected to the audio power amplifier module in a communication manner.

5. The sound amplifying circuit according to claim 1, further comprising an analog sound mixing module and a main processor, wherein the main processor is configured to obtain audio data, and the analog sound mixing module is configured to perform sound mixing processing on the audio data and the single-ended analog signal output by the differential-to-single-ended module.

6. The acoustic amplification circuit according to claim 5, wherein the analog mixing module is an adder, and an output end of the adder is connected to the audio power amplification module.

7. The sound amplifying circuit according to claim 5, wherein the main processor includes a digital-to-analog conversion module, the audio data is a digital signal, and the digital signal is converted by the digital-to-analog conversion module and then connected to the input terminal of the analog sound mixing module.

8. The acoustic amplification circuit of claim 1, further comprising an analog-to-digital conversion module configured to receive the audio signal collected by the microphone and convert the audio signal into a digital signal.

9. A smart screen comprising a public address circuit as claimed in any one of claims 1 to 8.

10. The smart screen of claim 9 wherein the smart screen includes a screen and a microphone, the speaker being disposed laterally of the screen, the microphone being in communication with the connector.

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