CN220493151U - Sound amplifying device and display equipment - Google Patents
Sound amplifying device and display equipment Download PDFInfo
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- CN220493151U CN220493151U CN202322223807.9U CN202322223807U CN220493151U CN 220493151 U CN220493151 U CN 220493151U CN 202322223807 U CN202322223807 U CN 202322223807U CN 220493151 U CN220493151 U CN 220493151U
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Abstract
The utility model discloses an acoustic amplifying device and a display device, the acoustic amplifying device comprises: a main control circuit and a first interface circuit for connecting an external sound pickup apparatus; the audio signal processing circuit comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is electrically connected with the main control circuit, the second input end is electrically connected with the first interface circuit, and the audio signal processing circuit is at least used for mixing a first audio signal from the main control circuit and a second audio signal from the first interface circuit and outputting a mixed audio signal through the first output end and the second output end; the internal loudspeaker module is electrically connected to the first output end and used for playing the mixed sound signal; the second interface circuit is electrically connected to the second output end and is used for being connected with an external loudspeaker module which is used for playing the mixed sound signal. The sound amplifying device can be suitable for sound amplifying occasions with different scales, and the applicability of the sound amplifying device is improved.
Description
Technical Field
The disclosure relates to the technical field of sound processing, and in particular relates to an acoustic amplifying device and display equipment.
Background
In many application scenarios, the need for amplification is often prevalent. Taking a multimedia classroom as an example, in order to effectively protect the voice of a teacher and enable students to hear the voice of the teacher, it is generally necessary to amplify the voice of the teacher through an amplifying device.
At present, an audio amplifying device plays an audio signal picked up by an external sound pickup device through a built-in speaker thereof, thereby realizing a sound amplifying function. However, for larger-scale sound amplification situations, on the one hand, this approach may not even be audible as the region farther from the sound amplification device corresponds to a smaller received sound; on the other hand, when the audio to be played exists in the sound amplifying device, two audio signals are directly played by the built-in loudspeaker, and the playing effect is poor. In view of this, how to improve the sound amplifying effect of the sound amplifying device is a problem to be solved.
Disclosure of Invention
The utility model mainly solves the technical problem of providing the sound amplifying device and the display equipment, which are applicable to different scale sound amplifying occasions and improve the applicability of the sound amplifying device.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: there is provided an acoustic amplifying apparatus including: a main control circuit and a first interface circuit for connecting an external sound pickup apparatus; the audio signal processing circuit comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is electrically connected with the main control circuit, the second input end is electrically connected with the first interface circuit, and the audio signal processing circuit is at least used for mixing a first audio signal from the main control circuit and a second audio signal from the first interface circuit and outputting a mixed audio signal through the first output end and the second output end; the internal loudspeaker module is electrically connected to the first output end and used for playing the mixed sound signal; the second interface circuit is electrically connected to the second output end and is used for being connected with an external loudspeaker module which is used for playing the mixed sound signal.
Therefore, for the occasion of smaller scale, the audio signal processing circuit can output the mixed sound signal to the internal loudspeaker module, so that the internal loudspeaker module plays the mixed sound signal, thereby realizing sound amplification. For the occasion of large scale, can pass the external speaker module of second interface circuit external connection, audio signal processing circuit can export the mixed sound signal to second interface circuit, makes external speaker module broadcast mixed sound signal to realize the public address. The sound amplifying device can be suitable for sound amplifying occasions with different scales, and the applicability of the sound amplifying device is improved.
The audio signal processing circuit is integrated with an audio application processing chip, the digital audio signal input end of the audio application processing chip is a first input end, the analog audio signal input end of the audio application processing chip is a second input end, the digital audio mixing signal output end of the audio application processing chip is a first output end, and the analog audio mixing signal output end of the audio application processing chip is a second output end.
Therefore, the second audio signal input by the analog audio signal input end can be subjected to analog-to-digital conversion through the audio application processing chip, and the first audio signal input by the digital audio signal input end and the second audio signal subjected to analog-to-digital conversion can be subjected to digital mixing processing.
The audio signal processing circuit comprises a first analog-to-digital conversion sub-circuit, a digital audio mixing sub-circuit and a first digital-to-analog conversion sub-circuit, wherein the input end of the first analog-to-digital conversion sub-circuit is a second input end, the first digital audio signal input end of the digital audio mixing sub-circuit is a first input end, the second digital audio signal input end of the digital audio mixing sub-circuit is electrically connected to the output end of the first analog-to-digital conversion sub-circuit, the first digital audio signal output end of the digital audio mixing sub-circuit is a first output end, the second digital audio signal output end of the digital audio mixing sub-circuit is electrically connected to the input end of the first digital-to-analog conversion sub-circuit, and the output end of the first digital audio mixing sub-circuit is a second output end.
Therefore, the first analog-to-digital conversion sub-circuit, the digital audio mixing sub-circuit and the first analog-to-digital conversion sub-circuit can realize the analog-to-digital conversion of the second audio signal input by the second input end of the audio signal processing circuit, and the digital audio mixing processing of the first audio signal input by the first input end of the audio signal processing circuit and the second audio signal after the analog-to-digital conversion.
The audio signal processing circuit comprises an analog audio mixing sub-circuit, wherein a first analog audio signal input end of the analog audio mixing sub-circuit is a first input end, a second analog audio signal input end of the analog audio mixing sub-circuit is a second input end, a first analog audio signal output end of the analog audio mixing sub-circuit is a first output end, and a second analog audio signal output end of the analog audio mixing sub-circuit is a second output end; the main control circuit comprises a main controller and a second digital-to-analog conversion sub-circuit, wherein the input end of the second digital-to-analog conversion sub-circuit is electrically connected with the signal output end of the main controller, and the output end of the second digital-to-analog conversion sub-circuit is electrically connected with the first analog audio signal input end of the analog audio mixing sub-circuit.
Thus, by the analog mixing sub-circuit, analog mixing processing of the first audio signal input at the first input terminal of the audio signal processing circuit and the second audio signal input at the second input terminal of the audio signal processing circuit can be realized.
The internal loudspeaker module comprises a power amplification circuit and a loudspeaker, wherein the input end of the power amplification circuit is electrically connected with the first output end, and the output end of the power amplification circuit is electrically connected with the input end of the loudspeaker.
Therefore, the power amplification and playing of the mixed sound signal output by the first output end of the audio signal processing circuit can be realized through the power amplification circuit and the loudspeaker.
The power amplifier circuit comprises a digital signal processor, a third digital-to-analog conversion sub-circuit and a first power amplifier, wherein the signal input end of the digital signal processor is electrically connected with the first output end, the signal output end of the digital signal processor is electrically connected with the input end of the third digital-to-analog conversion sub-circuit, the signal output end of the third digital-to-analog conversion sub-circuit is connected with the input end of the first power amplifier, and the output end of the first power amplifier is electrically connected with the input end of the loudspeaker; or the audio mixing signal output by the first output end is an analog audio mixing signal, the power amplification circuit comprises a second power amplifier and a frequency dividing circuit, the input end of the second power amplifier is electrically connected with the first input end, the output end of the second power amplifier is electrically connected with the input end of the frequency dividing circuit, and the output end of the frequency dividing circuit is electrically connected with the input end of the loudspeaker.
Therefore, when the audio signal output by the first output end of the audio signal processing circuit is a digital audio signal, the audio effect processing, digital frequency division and power amplification of the audio signal can be realized through the digital signal processor, the third digital-to-analog conversion sub-circuit and the first power amplifier; when the audio signal output by the first output end of the audio signal processing circuit is an analog audio signal, the power amplification and frequency division processing can be realized through the second power amplifier and frequency division circuit.
The sound amplifying device further comprises an operational amplifier module, and the operational amplifier module is electrically connected between the second output end and the second interface circuit.
Therefore, the audio signal output by the first output end of the audio signal processing circuit can be amplified through the operational amplifier module.
The second output end comprises a left channel signal output end and a right channel signal output end, the operational amplifier module comprises a first operational amplifier circuit and a second operational amplifier circuit, the inverting input end of the first operational amplifier circuit is electrically connected with the right channel signal output end, the inverting input end of the second operational amplifier circuit is electrically connected with the left channel signal output end, the non-inverting input ends of the first operational amplifier circuit and the second operational amplifier circuit are grounded, and the output ends of the first operational amplifier circuit and the second operational amplifier circuit are electrically connected with the second interface circuit.
Therefore, the amplification of the right channel mixed signal and the left channel mixed signal output by the second output end of the audio signal processing circuit can be respectively realized through the first operational amplifier circuit and the second operational amplifier circuit.
The second audio signal is a differential signal, the first interface circuit at least comprises an anode signal end and a cathode signal end, the sound amplifying device further comprises a third operational amplifier circuit, the anode input end of the third operational amplifier circuit is electrically connected to the anode signal end, the cathode input end of the third operational amplifier circuit is electrically connected to the cathode signal end, and the output end of the third operational amplifier circuit is electrically connected to the second input end.
Therefore, the conversion of the differential second audio signal into the single-ended signal input audio signal processing circuit can be realized by providing the third operational amplifier circuit. By employing fully differential wiring, the interference immunity of the audio signal transmission can be increased.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: there is provided a display apparatus comprising a display screen and the aforementioned sound amplifying means.
Above scheme, the sound amplifying device includes main control circuit, is used for connecting external pickup equipment's first interface circuit, audio signal processing circuit, inside speaker module and is used for connecting the second interface circuit of outside speaker module. The audio signal processing circuit may mix the first audio signal from the main control circuit and the second audio signal from the external sound pickup device. For occasions with smaller scale, the audio signal processing circuit can output a mixed sound signal to the internal loudspeaker module, so that the internal loudspeaker module plays the mixed sound signal, and the sound amplification is realized. For the occasion of large scale, can pass the external speaker module of second interface circuit external connection, audio signal processing circuit can export the mixed sound signal to second interface circuit, makes external speaker module broadcast mixed sound signal to realize the public address. The sound amplifying device can be suitable for sound amplifying occasions with different scales, and the applicability of the sound amplifying device is improved.
Drawings
FIG. 1 is a schematic view of an embodiment of an acoustic amplifying apparatus according to the present disclosure;
FIG. 2 is a schematic circuit diagram of an embodiment of an audio application processing chip provided herein;
FIG. 3 is a schematic diagram of an embodiment of an audio signal processing circuit provided in the present application;
FIG. 4 is a schematic diagram of another embodiment of an audio signal processing circuit provided herein;
FIG. 5 is a schematic diagram of an audio signal processing circuit according to another embodiment of the present application;
FIG. 6 is a schematic diagram of an embodiment of a power amplifier circuit according to the present disclosure;
FIG. 7 is a schematic diagram of another embodiment of a power amplifier circuit provided herein;
FIG. 8 is a schematic diagram of an embodiment of an operational amplifier module provided in the present application;
fig. 9 is a schematic structural diagram of an embodiment of a third operational amplifier circuit provided in the present application.
Detailed Description
The following describes the embodiments of the present application in detail with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an acoustic amplifying apparatus provided in the present application. It should be noted that, the sound amplifying device in this embodiment may be applied to a display device or other devices needing sound amplification. Illustratively, the display device may be a large display screen in a conference setting, a large smart blackboard screen in a teaching setting (e.g., recording and broadcasting classroom), etc. As shown in fig. 1, the sound amplifying apparatus includes a main control circuit 10, a first interface circuit 20, an audio signal processing circuit 30, an internal speaker module 40, and a second interface circuit 50.
Wherein the main control circuit 10 is configured to provide a first audio signal to the audio signal processing circuit 30. The first audio signal is illustratively a digital audio signal stored in a memory unit of the main control circuit 10, or the first audio signal may also be an analog audio signal obtained by the main control circuit 10 performing digital-to-analog conversion on the digital audio signal obtained from the memory unit.
The first interface circuit 20 is for connecting to an external sound pickup apparatus. The first interface circuit 20 may be disposed on the display device, or the first interface circuit 20 may be disposed at an arbitrary position outside the display device through a cable, for example. In an example, first interface circuit 20 may be electrically connected to an external sound pickup apparatus by a cable, where first interface circuit 20 includes a physical interface through which the external sound pickup apparatus may be plugged. In another example, the first interface circuit 20 is connected to an external sound pickup apparatus by wireless communication (e.g., bluetooth), and at this time, the first interface circuit 20 includes necessary elements such as a communication circuit. The second audio signal is an analog audio signal. The external sound pickup apparatus may be a wired microphone, a wireless microphone, a smart pen, or the like, which is not particularly limited in this embodiment.
The audio signal processing circuit 30 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. A first input terminal of the audio signal processing circuit 30 is electrically connected to the main control circuit 10, and a second input terminal of the audio signal processing circuit 30 is electrically connected to the first interface circuit 20. The audio signal processing circuit 30 is at least configured to mix the first audio signal from the main control circuit 10 and the second audio signal from the first interface circuit 20, and the mixed audio signal after mixing is output through the first output terminal of the audio signal processing circuit 30 and the second output terminal of the audio signal processing circuit 30. For example, the audio signal processing circuit 30 may perform digital mixing processing or analog mixing processing on the first audio signal and the second audio signal. The audio signal processing circuit 30 is connected with the main control circuit 10 and the internal speaker module 40 through an I2S interface.
The internal speaker module 40 is electrically connected to the first output terminal of the audio signal processing circuit 30. The internal speaker module 40 is used for playing the mixed audio signal. The internal speaker module 40 is provided inside the display device.
The second interface circuit 50 is electrically connected to the second output terminal of the audio signal processing circuit 30, and the second interface circuit 50 is used for connecting with an external speaker module. The external loudspeaker module is used for playing the mixed sound signal. Illustratively, the second interface circuit 50 is electrically connected to the external speaker module via a cable, and the second interface circuit 50 includes a physical interface for plugging the external speaker module. The second interface circuit 50 is illustratively a headphone interface, and the external speaker module is a sound box or other speaker component.
In this embodiment, the sound amplifying apparatus includes a main control circuit, a first interface circuit for connecting with an external sound pickup device, an audio signal processing circuit, an internal speaker module, and a second interface circuit for connecting with the external speaker module. The audio signal processing circuit may mix the first audio signal from the main control circuit and the second audio signal from the external sound pickup device. For occasions with smaller scale, the audio signal processing circuit can output a mixed sound signal to the internal loudspeaker module, so that the internal loudspeaker module plays the mixed sound signal, and the sound amplification is realized. For the occasion of large scale, can pass the external speaker module of second interface circuit external connection, audio signal processing circuit can export the mixed sound signal to second interface circuit, makes external speaker module broadcast mixed sound signal to realize the public address. The sound amplifying device can be suitable for sound amplifying occasions with different scales, and the applicability of the sound amplifying device is improved.
In the present embodiment, the first audio signal from the main control circuit 10 is a digital audio signal. The audio signal processing circuit 30 is configured to perform digital-to-analog conversion on the second audio signal from the first interface circuit 20 to convert the second audio signal into a digital audio signal; performing digital audio mixing processing on the first audio signal and the digital-to-analog converted second audio signal to obtain a digital audio mixing signal; and D, performing digital-to-analog conversion processing on the digital mixed signal to obtain an analog mixed signal. The digital audio signal is output to the internal speaker module 40 through the first output end of the audio signal processing circuit 30, and the analog audio signal is output to the second interface circuit 50 through the second output end of the audio signal processing circuit 30.
In one embodiment, the audio signal processing circuit 30 is integrated with an audio application processing chip. The digital audio signal input end of the audio application processing chip is the first input end of the audio signal processing circuit 30, the analog audio signal input end of the audio application processing chip is the second input end of the audio signal processing circuit 30, the digital audio signal output end of the audio application processing chip is the first output end of the audio signal processing circuit 30, and the analog audio signal output end of the audio application processing chip is the second output end of the audio signal processing circuit 30. The audio application processing chip integrates the functions of analog-to-digital conversion, digital mixing, digital-to-analog conversion, audio processing and the like. Audio processing may include echo cancellation, noise suppression, parametric equalization, and the like. The audio application processing chip may be further configured to perform audio processing on the first audio signal and the analog-to-digital converted second audio signal, and perform audio processing on the digital audio signal before performing digital-to-analog conversion on the digital audio signal.
Specifically, referring to fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of an audio application processing chip provided in the present application. As shown in fig. 2, the audio application processing chip is of the type AP8224C2, wherein the SCL/TX pin is a digital audio signal input end of the audio application processing chip, the MIC4 pin is an analog audio signal input end of the audio application processing chip, the i2s_lrck pin, the i2s_bclk pin, and the i2s_do pin are digital audio signal output ends of the audio application processing chip, and the dac_l pin and the dac_r pin are analog audio signal output ends of the audio application processing chip.
In another embodiment, referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of an audio signal processing circuit provided in the present application. As shown in fig. 3, the audio signal processing circuit 30 includes a first analog-to-digital conversion sub-circuit 31, a digital mixing sub-circuit 32, and a first digital-to-analog conversion sub-circuit 33. The input end of the first analog-to-digital conversion sub-circuit 31 is the second input end of the audio signal processing circuit 30, the first digital audio signal input end of the digital audio mixing sub-circuit 32 is the first input end of the audio signal processing circuit 30, the second digital audio signal input end of the digital audio mixing sub-circuit 32 is electrically connected to the output end of the first analog-to-digital conversion sub-circuit 31, the first digital audio signal output end of the digital audio mixing sub-circuit 32 is the first output end of the audio signal processing circuit 30, the second digital audio signal output end of the digital audio mixing sub-circuit 32 is electrically connected to the input end of the first digital-to-analog conversion sub-circuit 33, and the output end of the first digital-to-analog conversion sub-circuit 33 is the second output end of the audio signal processing circuit 30. Illustratively, the digital mixing sub-circuit 32 may be an integrated circuit chip having digital mixing functions.
Optionally, the first audio signal from the master circuit 10 is an analog audio signal. The audio signal processing circuit 30 is configured to perform an analog audio mixing process on the first audio signal and the second audio signal from the first interface circuit 20, so as to obtain an analog audio mixing signal. The analog audio signal is output to the internal speaker module 40 through the first output terminal of the audio signal processing circuit 30, and is output to the second interface circuit 50 through the second output terminal of the audio signal processing circuit 30.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of an audio signal processing circuit provided in the present application. As shown in fig. 4, the audio signal processing circuit 30 includes an analog audio mixing sub-circuit 34, a first analog audio signal input end of the analog audio mixing sub-circuit 34 is a first input end of the audio signal processing circuit 30, a second analog audio signal input end of the analog audio mixing sub-circuit 34 is a second input end of the audio signal processing circuit 30, a first analog audio signal output end of the analog audio mixing sub-circuit 34 is a first output end of the audio signal processing circuit 30, and a second analog audio signal output end of the analog audio mixing sub-circuit 34 is a second output end of the audio signal processing circuit 30. The analog mixing sub-circuit 34 is illustratively an additive operational amplifier, or the analog mixing sub-circuit 34 is other integrated circuit chip with analog mixing function.
The main control circuit 10 includes a main controller 11 and a second digital-to-analog conversion sub-circuit 12, wherein an input end of the second digital-to-analog conversion sub-circuit 12 is electrically connected to a signal output end of the main controller 11, and an output end of the second digital-to-analog conversion sub-circuit 12 is electrically connected to a first analog audio signal input end of the analog audio mixing sub-circuit 34. The digital audio signal obtained by the main controller 11 is converted by the second digital-to-analog conversion sub-circuit 12 to obtain a first audio signal.
Alternatively, the first audio signal includes a digital audio signal directly output by the main controller 11, and an analog audio signal obtained by digital-to-analog conversion of the digital audio signal output by the main controller 11. The audio signal processing circuit 30 may be further configured to perform digital-to-analog conversion on the second audio signal from the first interface circuit 20, and perform digital audio mixing processing on the digital audio signal from the main control circuit 10 and the digital-to-analog converted second audio signal to obtain a digital audio mixed signal; the analog audio signal from the main control circuit 10 and the second audio signal from the first interface circuit 20 are subjected to analog mixing processing to obtain an analog mixed signal. The digital audio signal is output to the internal speaker module 40 through the first output end of the audio signal processing circuit 30, and the analog audio signal is output to the second interface circuit 50 through the second output end of the audio signal processing circuit 30.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an audio signal processing circuit 30 according to another embodiment of the present application. As shown in fig. 5, the audio signal processing circuit 30 includes a first signal processing sub-circuit 35 and a second signal processing sub-circuit 36. The first input end of the first signal processing sub-circuit 35 is electrically connected to the first signal output end of the main controller 11, the second input end of the first signal processing sub-circuit 35 is electrically connected to the first interface circuit 20, and the output end of the first signal processing sub-circuit 35 is electrically connected to the internal speaker module 40. The first input terminal of the second signal processing sub-circuit 36 is electrically connected to the output terminal of the second digital-to-analog conversion sub-circuit 12, the input terminal of the second digital-to-analog conversion sub-circuit 12 is connected to the second signal output terminal of the main controller 11, the second input terminal of the second signal processing sub-circuit 36 is electrically connected to the first interface circuit 20, and the output terminal of the second signal processing sub-circuit 36 is electrically connected to the second interface circuit 50. The first input terminal of the first signal processing sub-circuit 35 and the first input terminal of the second signal processing sub-circuit 36 are the first input terminal of the audio signal processing circuit 30, the second input terminal of the first signal processing sub-circuit 35 and the second input terminal of the second signal processing sub-circuit 36 are the second input terminal of the audio signal processing circuit 30, the output terminal of the first signal processing sub-circuit 35 is the first output terminal of the audio signal processing circuit 30, and the output terminal of the second signal processing sub-circuit 36 is the second output terminal of the audio signal processing circuit 30.
The first signal processing sub-circuit 35 is configured to perform digital-to-analog conversion on the second audio signal from the first interface circuit 20, and perform digital mixing processing on the digital audio signal from the control circuit 10 and the digital-to-analog converted second audio signal, so as to obtain a digital mixed signal. Illustratively, the first signal processing sub-circuit 35 comprises an audio application processing chip, or the first signal processing sub-circuit 35 comprises a digital-to-analog conversion device and a digital mixing device. The second signal processing sub-circuit 36 is configured to perform an analog audio mixing process on the analog audio signal from the main control circuit 10 and the second audio signal from the first interface circuit 20, so as to obtain an analog audio mixing signal. The second signal processing sub-circuit 36 illustratively comprises an analog audio mixing device.
In this embodiment, the internal speaker module 40 includes a power amplifier circuit 41 and a speaker 42, wherein an input end of the power amplifier circuit 41 is electrically connected to a first output end of the audio signal processing circuit 30, and an output end of the power amplifier circuit 41 is electrically connected to an input end of the speaker 42. The number of the power amplifier circuits 41 may be 1 or more.
In an embodiment, when the audio signal output by the first output terminal of the audio signal processing circuit 30 is a digital audio signal, the digital audio signal output by the first output terminal of the audio signal processing circuit 30 is processed by a digital power amplifier circuit.
Specifically, referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a power amplifier circuit provided in the present application. As shown in fig. 6, the power amplifier circuit 41 includes a digital signal processor 411, a third digital-to-analog conversion sub-circuit 412, and a first power amplifier 413. The signal input end of the digital signal processor 411 is electrically connected to the first output end of the audio signal processing circuit 30, the signal output end of the digital signal processor 411 is electrically connected to the input end of the third digital-to-analog conversion sub-circuit 412, the signal output end of the third digital-to-analog conversion sub-circuit 412 is connected to the input end of the first power amplifier 413, and the output end of the first power amplifier 413 is electrically connected to the input end of the speaker 42.
The digital signal processor 411 is configured to perform audio processing on the digital audio signal output from the first output terminal of the audio signal processing circuit 30, and perform digital frequency division processing on the audio signal. Illustratively, the sound effect processing includes signal suppression, equalization, and the like. The digital divide processing may be divide-by-two, divide-by-three, etc., and divide-by-two may divide the full-frequency audio signal into a high-frequency audio signal and a low-frequency audio signal. The third digital-to-analog conversion sub-circuit 412 is configured to perform digital-to-analog conversion on the digital audio signal after the digital frequency division process. The first power amplifier 413 is configured to power amplify the analog audio mix signal obtained after digital-to-analog conversion. Illustratively, the first power amplifier 413 is a class D power amplifier 413. The number of speakers 42 is plural, for example, when the digital crossover process is 2 crossover, the number of speakers 42 is 4, such as a left tweeter, a right tweeter, a left woofer (or a left full-range speaker), and a right woofer (a right full-range speaker).
In this embodiment, when the audio signal output by the first output end of the audio signal processing circuit 30 is a digital audio signal, the digital audio signal output by the first output end of the audio signal processing circuit 30 can be subjected to audio processing by the digital power amplifier circuit, so that the sound amplifying quality can be improved, and the differential audio tone teaching can be realized, so as to further improve the sound amplifying effect of the sound amplifying device.
In another embodiment, when the audio signal output by the first output terminal of the audio signal processing circuit 30 is an analog audio signal, the analog audio signal output by the first output terminal of the audio signal processing circuit 30 is processed by an analog power amplifier circuit.
Specifically, referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of a power amplifier circuit provided in the present application. As shown in fig. 7, the power amplifier circuit 41 includes a second power amplifier 414 and a frequency divider circuit 415. The input end of the second power amplifier 414 is electrically connected to the first input end, the output end of the second power amplifier 414 is electrically connected to the input end of the frequency divider circuit 415, and the output end of the frequency divider circuit 415 is electrically connected to the input end of the speaker 42. Illustratively, the frequency divider circuit 415 includes a high pass filter circuit and a low pass filter circuit to achieve a divide-by-two frequency division; alternatively, the frequency divider circuit 415 includes a high pass filter circuit, a band pass filter circuit, and a low pass filter circuit to achieve frequency division by three.
Optionally, in this embodiment, the power amplifier circuit 41 may be further connected to the main control circuit 10 through the I2C interface in a communication manner, and at this time, the main control circuit 10 may issue a control instruction to the power amplifier circuit 41 to control the power amplifier circuit 41 to work.
In this embodiment, the sound amplifying device further includes an operational amplifier module 60. The operational amplifier module 60 is electrically connected between the second output terminal of the audio signal processing circuit 30 and the second interface circuit 50. The operational amplifier module 60 is configured to amplify the analog audio signal output from the second output terminal of the audio signal processing circuit 30.
Specifically, referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of an operational amplifier module provided in the present application. As shown in fig. 8, the second output terminal of the audio signal processing circuit 30 includes a left channel signal output terminal and a right channel signal output terminal. The operational amplifier module 60 includes a first operational amplifier circuit 61 and a second operational amplifier circuit 62, wherein an inverting input terminal of the first operational amplifier circuit 61 is electrically connected to a right channel signal output terminal, an inverting input terminal of the second operational amplifier circuit 62 is electrically connected to a left channel signal output terminal, and non-inverting input terminals of both the first operational amplifier circuit 61 and the second operational amplifier circuit 62 are grounded, and output terminals of both the first operational amplifier circuit 61 and the second operational amplifier circuit 62 are electrically connected to the second interface circuit 50.
In this embodiment, the second audio signal is a differential signal. The sound amplifying device further comprises a third operational amplifier circuit 70. The third operational amplifier circuit 70 is configured to convert the second audio signal from a differential signal to a single-ended signal, and input the single-ended signal to the audio signal processing circuit 30. By employing fully differential wiring, the immunity to interference of the audio signal transmission is increased.
Specifically, referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a third operational amplifier circuit provided in the present application. As shown in fig. 9, the positive input terminal of the third operational amplifier circuit 70 is electrically connected to the positive signal terminal of the first interface circuit 20, the negative input terminal of the third operational amplifier circuit 70 is electrically connected to the negative signal terminal of the first interface circuit 20, and the output terminal of the third operational amplifier circuit 70 is electrically connected to the second input terminal of the audio signal processing circuit 30. In this embodiment, the first interface circuit 20 includes a positive signal terminal (mic+ in fig. 9), a negative signal terminal (MIC-) in fig. 9, and a ground terminal (GND in fig. 9). Wherein the negative signal terminal of the first interface circuit 20 is connected to the ground terminal of the external pickup device.
The application also provides a display device which comprises a display screen and the sound amplifying device. The relevant content of the display device may refer to the embodiment shown in fig. 1, and will not be described here again.
The following describes an exemplary embodiment of the present application by taking a display device as a large smart blackboard screen in a multimedia classroom as an example.
The teacher carries the external pickup device, or is provided with the external pickup device nearby the teacher. In the process of playing video courses, a teacher needs to explain the played video courses. After the second audio signal (teacher lecture sound) is collected through the external pickup device, the audio signal processing circuit is used for carrying out audio mixing processing on the first audio signal (audio of the video lesson in the display device) and the second audio signal, so that a mixed audio signal is obtained. For classrooms with smaller scale, the audio signal processing circuit can output a mixing signal to the internal loudspeaker module, so that the internal loudspeaker module plays the mixing signal; for classrooms with larger scale, the external loudspeaker module can be externally connected with the second interface circuit, and the audio signal processing circuit can output a sound mixing signal to the second interface circuit, so that the external loudspeaker module plays the sound mixing signal. The internal loudspeaker module or the external loudspeaker module can synchronously play video courses and teacher explanation contents, so that teaching public address is realized.
The foregoing is only the embodiments of the present application, and not the patent scope of the present application is limited by the foregoing description, but all equivalent structures or equivalent processes using the contents of the present application and the accompanying drawings, or directly or indirectly applied to other related technical fields, which are included in the patent protection scope of the present application.
Claims (10)
1. An acoustic amplification device, characterized in that the acoustic amplification device comprises:
a main control circuit and a first interface circuit for connecting an external sound pickup apparatus;
the audio signal processing circuit comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is electrically connected with the main control circuit, the second input end is electrically connected with the first interface circuit, and the audio signal processing circuit is at least used for mixing a first audio signal from the main control circuit and a second audio signal from the first interface circuit and outputting a mixed audio signal through the first output end and the second output end;
the internal loudspeaker module is electrically connected to the first output end and used for playing the audio mixing signal;
the second interface circuit is electrically connected to the second output end and is used for being connected with an external loudspeaker module, and the external loudspeaker module is used for playing the mixed sound signals.
2. The sound amplifying apparatus according to claim 1, wherein the audio signal processing circuit is integrated with an audio application processing chip, a digital audio signal input end of the audio application processing chip is the first input end, an analog audio signal input end of the audio application processing chip is the second input end, a digital audio signal output end of the audio application processing chip is the first output end, and an analog audio signal output end of the audio application processing chip is the second output end.
3. The sound amplifying device according to claim 1, wherein the audio signal processing circuit includes a first analog-to-digital conversion sub-circuit, a digital mixing sub-circuit, and a first digital-to-analog conversion sub-circuit, the input end of the first analog-to-digital conversion sub-circuit is the second input end, the first digital audio signal input end of the digital mixing sub-circuit is the first input end, the second digital audio signal input end of the digital mixing sub-circuit is electrically connected to the output end of the first analog-to-digital conversion sub-circuit, the first digital mixing signal output end of the digital mixing sub-circuit is the first output end, the second digital mixing signal output end of the digital mixing sub-circuit is electrically connected to the input end of the first digital-to-analog conversion sub-circuit, and the output end of the first digital-to-analog conversion sub-circuit is the second output end.
4. The sound amplifying apparatus according to claim 1, wherein the audio signal processing circuit includes an analog mixing sub-circuit, a first analog audio signal input terminal of the analog mixing sub-circuit is the first input terminal, a second analog audio signal input terminal of the analog mixing sub-circuit is the second input terminal, a first analog mixing signal output terminal of the analog mixing sub-circuit is the first output terminal, and a second analog mixing signal output terminal of the analog mixing sub-circuit is the second output terminal;
the main control circuit comprises a main controller and a second digital-to-analog conversion sub-circuit, wherein the input end of the second digital-to-analog conversion sub-circuit is electrically connected with the signal output end of the main controller, and the output end of the second digital-to-analog conversion sub-circuit is electrically connected with the first analog audio signal input end of the analog audio mixing sub-circuit.
5. The sound amplifying apparatus according to claim 1, wherein the internal sound amplifying module comprises a power amplifying circuit and a speaker, an input end of the power amplifying circuit is electrically connected to the first output end, and an output end of the power amplifying circuit is electrically connected to an input end of the speaker.
6. The sound amplifying apparatus according to claim 5, wherein the sound mixing signal output by the first output end is a digital sound mixing signal, the power amplifying circuit includes a digital signal processor, a third digital-to-analog conversion sub-circuit, and a first power amplifier, the signal input end of the digital signal processor is electrically connected to the first output end, the signal output end of the digital signal processor is electrically connected to the input end of the third digital-to-analog conversion sub-circuit, the signal output end of the third digital-to-analog conversion sub-circuit is connected to the input end of the first power amplifier, and the output end of the first power amplifier is electrically connected to the input end of the speaker; or,
the audio mixing signal output by the first output end is an analog audio mixing signal, the power amplification circuit comprises a second power amplifier and a frequency dividing circuit, the input end of the second power amplifier is electrically connected with the first input end, the output end of the second power amplifier is electrically connected with the input end of the frequency dividing circuit, and the output end of the frequency dividing circuit is electrically connected with the input end of the loudspeaker.
7. The sound amplifying apparatus according to claim 1, further comprising an operational amplifier module electrically connected between the second output terminal and the second interface circuit.
8. The sound amplifying apparatus of claim 7, wherein the second output terminal comprises a left channel signal output terminal and a right channel signal output terminal, the operational amplifier module comprises a first operational amplifier circuit and a second operational amplifier circuit, the inverting input terminal of the first operational amplifier circuit is electrically connected to the right channel signal output terminal, the inverting input terminal of the second operational amplifier circuit is electrically connected to the left channel signal output terminal, and the non-inverting input terminals of both the first operational amplifier circuit and the second operational amplifier circuit are grounded, and the output terminals of both the first operational amplifier circuit and the second operational amplifier circuit are electrically connected to the second interface circuit.
9. The sound amplifying apparatus according to claim 1, wherein the second audio signal is a differential signal, the first interface circuit includes at least a positive signal terminal and a negative signal terminal, the sound amplifying apparatus further includes a third operational amplifier circuit, a positive input terminal of the third operational amplifier circuit is electrically connected to the positive signal terminal, a negative input terminal of the third operational amplifier circuit is electrically connected to the negative signal terminal, and an output terminal of the third operational amplifier circuit is electrically connected to the second input terminal.
10. A display apparatus comprising a display screen and an acoustic amplifying device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322223807.9U CN220493151U (en) | 2023-08-16 | 2023-08-16 | Sound amplifying device and display equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322223807.9U CN220493151U (en) | 2023-08-16 | 2023-08-16 | Sound amplifying device and display equipment |
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| CN220493151U true CN220493151U (en) | 2024-02-13 |
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| CN202322223807.9U Active CN220493151U (en) | 2023-08-16 | 2023-08-16 | Sound amplifying device and display equipment |
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