CN218788834U - Loudspeaker sounding phase frequency compensation device and intelligent large screen - Google Patents
Loudspeaker sounding phase frequency compensation device and intelligent large screen Download PDFInfo
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- CN218788834U CN218788834U CN202222979017.9U CN202222979017U CN218788834U CN 218788834 U CN218788834 U CN 218788834U CN 202222979017 U CN202222979017 U CN 202222979017U CN 218788834 U CN218788834 U CN 218788834U
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Abstract
The application discloses a loudspeaker sounding phase frequency compensation device and a smart large screen; the loudspeaker sounding phase-frequency compensation device comprises a gradient compensation module and a phase compensation module; the gradient compensation module is used for carrying out frequency response compensation on the input signal according to the frequency of the input audio signal, and the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal; the phase compensation module is used for performing phase compensation on the signal subjected to the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal subjected to the gradient compensation; and the signal output by the phase compensation module is transmitted to a loudspeaker. After gradient compensation and phase compensation, when the side face of the loudspeaker makes a sound, the frequency response attenuation and the phase difference of the middle-high frequency part of the input audio signal are compensated; when the side face of the loudspeaker makes sound, the loudspeaker can also make sound with higher brightness and definition.
Description
Technical Field
The application relates to the technical field of loudspeakers, in particular to a loudspeaker sound production phase frequency compensation device and a smart large screen.
Background
With the continuous development of digital information, the smart large screen is widely applied to the fields of education, office work or media and the like.
Some existing intelligent large screens adopt a loudspeaker front sounding design to ensure a good acoustic effect, but the design needs to occupy a large frame area, so that the appearance is influenced; in addition, in order to ensure the appearance of the intelligent large screen, the intelligent large screen adopts a full-screen design or a narrow-frame design, so that the loudspeaker is placed behind the intelligent large screen and sounds in a mode of sounding from the side surface of the loudspeaker; however, the sound coming out from the side of the loudspeaker can cause the medium-high frequency response to drop seriously, which affects the brightness and definition of the loudspeaker and has poor acoustic effect.
SUMMERY OF THE UTILITY MODEL
In view of this, the application provides a speaker sound production phase frequency compensation arrangement and big screen of wisdom, can improve the brightness and the definition of speaker, improves the acoustic effect of the big screen of wisdom.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the first aspect of the present application provides a speaker sound production phase frequency compensation device, which includes a gradient compensation module and a phase compensation module;
the gradient compensation module is used for carrying out frequency response compensation on the input signal according to the frequency of the input audio signal, and the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal;
the phase compensation module is used for performing phase compensation on the signal subjected to the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal subjected to the gradient compensation;
and the signal output by the phase compensation module is transmitted to a loudspeaker.
Preferably, the gradient compensation module comprises: the circuit comprises a first amplifier, a first resistor, a second resistor, a first impedance branch, a second impedance branch and a third impedance branch;
the negative input end of the first amplifier is connected with the output end of the first amplifier through a second resistor; the output end of the first amplifier is used as the output end of the gradient compensation module; the positive input end of the first amplifier is grounded;
the input audio signal is input into the negative input end of the first amplifier through the first resistor;
the first impedance branch circuit, the second impedance branch circuit and the third impedance branch circuit are all connected in parallel at two ends of the first resistor;
the impedances presented by the first impedance branch, the second impedance branch and the third impedance branch are different.
Preferably, the first impedance branch comprises a first capacitor and a third resistor which are connected in series, the second impedance branch comprises a second capacitor and a fourth resistor which are connected in series, and the third impedance branch comprises a third capacitor and a fifth resistor which are connected in series;
the capacitance values of the second capacitor and the third capacitor are the same and are both smaller than the capacitance value of the first capacitor;
the resistance value of the third resistor is smaller than that of the fifth resistor, and the resistance value of the fifth resistor is smaller than that of the fourth resistor.
Preferably, the phase compensation module includes: the second amplifier, the sixth resistor, the seventh resistor, the eighth resistor and the fourth capacitor;
the negative input end of the second amplifier is connected with the output end of the gradient compensation module through a sixth resistor;
the negative input end of the second amplifier is connected with the output end of the second amplifier through a seventh resistor; the output end of the second amplifier is used as the output end of the phase compensation module;
the positive input end of the second amplifier is connected with the output end of the gradient compensation module through an eighth resistor;
the positive input end of the second amplifier is grounded through a fourth capacitor.
Preferably, the resistance value of the sixth resistor, the resistance value of the seventh resistor and the resistance value of the eighth resistor are equal.
Preferably, the method further comprises the following steps: the audio power amplification module is connected between the input audio signal and the gradient compensation module;
and the audio power amplification module is used for amplifying the input audio signal and transmitting the amplified signal to the gradient compensation module.
Preferably, the method further comprises the following steps: the buffer module is connected between the gradient compensation module and the phase compensation module;
the buffer module is used for reducing the impedance of the output end of the gradient compensation module.
Preferably, the buffer module includes: a voltage follower.
Preferably, the method further comprises the following steps: a main control module;
the main control module is used for outputting the input audio signal to the sound effect power amplification module.
The second aspect of the present application provides a big screen of wisdom, including the speaker sound production phase frequency compensation arrangement who introduces above, still include: a speaker;
the loudspeaker is positioned at the back of the screen of the intelligent large screen, and the sound emitting direction of the loudspeaker is positioned on at least one side face of the periphery of the screen;
the loudspeaker sound production phase frequency compensation device is connected with the loudspeaker and used for performing phase frequency compensation on audio signals before sound production of the loudspeaker.
Therefore, the application has the following beneficial effects:
the sound production phase frequency compensation device for the loudspeaker comprises a gradient compensation module and a phase compensation module; the gradient compensation module compensates the frequency response of the input signal, and the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal; the phase compensation module performs phase compensation on the signal after the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal after the gradient compensation. After gradient compensation and phase compensation, when the side face of the loudspeaker makes a sound, the frequency response attenuation and phase difference of the middle-high frequency part of the input audio signal are compensated; when the side face of the loudspeaker makes sound, the loudspeaker can also make sound with higher brightness and definition.
Drawings
Fig. 1 is a schematic diagram of a speaker sound phase-frequency compensation apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a frequency response curve with a gradient compensation module according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a phase characteristic curve with a phase compensation module according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of another speaker sound phase frequency compensation device according to an embodiment of the present application;
FIG. 5 is a circuit diagram of an internal portion of a gradient compensation module according to an embodiment of the present application;
fig. 6 is a circuit diagram of an internal circuit of a phase compensation module according to an embodiment of the present disclosure;
fig. 7 is a circuit diagram of an internal portion of a buffer module according to an embodiment of the present application;
fig. 8 is a schematic view of an intelligent large screen according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand and implement the technical solution of the present application, a specific application scenario of the present application is described below.
Many intelligent large screens adopt a full screen design or a narrow frame design, and the front sides of the intelligent large screens have insufficient space to reserve sound holes; therefore, the speaker is often placed on the back of the smart large screen, so that the speaker can only be used for sounding in a manner of sounding from the side face of the speaker. At this time, due to the layout and structure of the speaker, the middle-high frequency response will drop seriously, and the brightness and definition will be greatly reduced.
The application provides a speaker sound production phase frequency compensation arrangement and wisdom are shielded greatly, can compensate the signal amplitude attenuation and the phase difference of the high-frequency difference in degree of difference that the speaker side sound production leads to, guarantee that the speaker sound production is clear bright, level and smooth balanced.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 1, the drawing is a schematic diagram of a device for compensating sounding phase frequency of a speaker according to an embodiment of the present application.
The utility model provides a speaker sound production phase frequency compensation arrangement includes: a gradient compensation module 100 and a phase compensation module 200.
The gradient compensation module 100 is configured to perform frequency response compensation on the input signal according to the frequency of the input audio signal, where the frequency response compensation gradient is proportional to the frequency of the input audio signal.
The gradient compensation module 100 may be connected to the main control module to receive the audio signal from the main control module.
When the side face of the loudspeaker makes a sound, the higher the frequency of the signal is, the more serious the attenuation degree of the frequency response is, so that the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal; the higher the frequency of the input audio signal, the higher the frequency response compensation provided by the gradient compensation module 100.
Referring to fig. 2, the graph is a schematic diagram of a frequency response curve with a gradient compensation module according to an embodiment of the present application.
The abscissa in fig. 2 represents the frequency of an input audio signal, and the ordinate represents the frequency response.
Curve a in fig. 2 represents the frequency response of the signal compensated by the gradient compensation module; curve B represents the frequency response of the signal before compensation by the gradient compensation module; curve C represents the frequency response compensated by the gradient compensation module.
The original frequency response curve is in a middle-high frequency region above 2000Hz, and obvious frequency response attenuation occurs; after the compensation of the gradient compensation module, the medium-high frequency response is obviously improved; and the higher the frequency, the higher the compensating gradient.
And the phase compensation module is used for performing phase compensation on the signal subjected to the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal subjected to the gradient compensation.
When the side face of the loudspeaker makes a sound, the higher the frequency is, the larger the phase difference of the signals is, so that the compensated phase is in direct proportion to the frequency of the signals after gradient compensation; the higher the frequency of the gradient compensated signal, the higher the phase compensation provided by the phase compensation module.
Referring to fig. 3, a schematic diagram of a phase characteristic curve with a phase compensation module according to an embodiment of the present disclosure is shown.
The abscissa in fig. 3 represents the frequency of the input signal of the phase compensation module and the ordinate represents the phase difference.
Curve a in fig. 3 represents the phase difference of the signal before compensation by the phase compensation module; curve B represents the phase difference of the signal compensated by the phase compensation module; curve C represents the phase compensated by the phase compensation module.
The phase difference of the original phase begins to rise at about 1000Hz, and the higher the frequency is, the more the rise is; after the compensation of the phase compensation module, the phase difference increase is obviously improved; wherein the higher the frequency, the more the compensation phase.
The signal output by the phase compensation module is transmitted to the loudspeaker, so that the sound production of the loudspeaker has higher brightness and definition.
The loudspeaker sounding phase frequency compensation device provided by the embodiment of the application comprises a gradient compensation module and a phase compensation module; the gradient compensation module compensates the frequency response of the input audio signal, and the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal; the phase compensation module performs phase compensation on the signal after the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal after the gradient compensation. After gradient compensation and phase compensation, when the side face of the loudspeaker makes a sound, the frequency response attenuation and phase difference of medium and high frequencies are compensated; when the side face of the loudspeaker makes sound, the loudspeaker can also emit audio with high brightness and definition.
One possible implementation is described below.
Referring to fig. 4, this figure is a schematic diagram of another device for compensating the sounding phase frequency of a speaker according to an embodiment of the present application.
The utility model provides a speaker sound production phase frequency compensation arrangement includes: the system comprises a gradient compensation module 100, a phase compensation module 200, a main control module 300, an audio power amplifier module 400 and a buffer module 500.
The function of the phase compensation module 200 of the gradient compensation module 100 is the same as that of the above embodiments, and is not described herein again.
The main control module 300 is used for outputting the input audio signal to the sound effect power amplifier module 400.
The audio power amplifier module 400 is connected with the main control module 300 and receives an audio signal sent by the main control module 300; the audio power amplifier module 400 is configured to amplify an input audio signal, and transmit the amplified audio signal to the gradient compensation module 100.
The buffering module 500 is configured to buffer a signal output by the gradient compensation module 100, so as to prevent an output impedance of the gradient compensation module 100 from affecting a transfer function of the phase compensation module 200.
The present application does not specifically limit the specific circuit components of the gradient compensation module 100, the phase compensation module 200, and the buffer module 300, which are described below by way of example with reference to the accompanying drawings.
Referring to fig. 5, the figure is a circuit diagram of an interior of a gradient compensation module according to an embodiment of the present application.
The gradient compensation module that this application embodiment provided includes: the circuit comprises a first amplifier A1, a first resistor R1, a second resistor R2, a first impedance branch, a second impedance branch and a third impedance branch.
The first impedance branch comprises a first capacitor C1 and a third resistor R3 which are connected in series; the second impedance branch comprises a second capacitor C2 and a fourth resistor R4 which are connected in series; the third impedance branch comprises a third capacitor C3 and a fifth resistor R5 connected in series.
The negative input end of the first amplifier A1 is connected with the output end of the first amplifier A1 through a second resistor R2; the output end of the first amplifier A1 is used as the output end of the gradient compensation module; the positive input of the first amplifier A1 is grounded.
The input audio signal is input to the negative input terminal of the first amplifier A1 through the first resistor R1.
The first impedance branch circuit, the second impedance branch circuit and the third impedance branch circuit are all connected in parallel at two ends of the first resistor R1.
The impedances presented by the first impedance branch circuit, the second impedance branch circuit and the third impedance branch circuit are different.
The specific values of the capacitors and the resistors in the first impedance branch, the second impedance branch and the third impedance branch are not specifically limited in the application; for example, it may be: the capacitance values of the second capacitor C2 and the third capacitor C3 are the same and are both smaller than the capacitance value of the first capacitor C1; the resistance of the third resistor R3 is smaller than the resistance of the fifth resistor R5, and the resistance of the fifth resistor R5 is smaller than the resistance of the fourth resistor R4. The values of the capacitance and the resistance in the first impedance branch, the second impedance branch and the third impedance branch can be adjusted by those skilled in the art according to the divided frequency limit.
Due to the circuit characteristics of the RC series circuit, the impedance of each impedance branch decreases as the frequency of the input audio signal increases; each impedance branch has a turning frequency, and when the frequency of the input audio signal is greater than the turning frequency, the total impedance of the impedance branches is basically unchanged and equal to the resistance value of the impedance branch.
The turning frequency of each impedance branch can be adjusted by a person skilled in the art according to requirements, and specifically, the capacitance value of the capacitor and the resistance value of the resistor of each impedance branch can be adjusted to realize adjustment of the turning frequency, and the turning frequency corresponds to different frequency range ranges.
The first impedance branch, the second impedance branch and the third impedance branch respectively correspond to a first turning frequency, a second turning frequency and a third turning frequency; taking the first turning frequency, the second turning frequency and the third turning frequency as an example, there are four frequency intervals: the frequency is lower than the first inflection frequency; the first turning frequency is greater than or equal to the first turning frequency and is less than the second turning frequency, and the medium-high frequency is obtained; a high frequency is higher than or equal to the second turning frequency and lower than the third turning frequency; the third turning frequency is ultrahigh frequency.
When the frequency of the input audio signal is in a low-frequency interval, the impedances of the first impedance branch, the second impedance branch and the third impedance branch are all very high, and the current only flows through the first resistor R1 to reach the second resistor R2; the circuit gain G1 of the gradient compensation module at this time is: g1= R2/R1.
When the frequency of the input audio signal is in a middle-high frequency interval, current flows through the first resistor R1 and the third resistor R3 to reach the second resistor R2; the circuit gain G2 of the gradient compensation module at this time is: g2= R2/(R1/R3). Obviously, the gain for medium and high frequencies is larger than the gain for low frequencies.
When the frequency of the input audio signal is in a high-frequency interval, current flows through the first resistor R1, the third resistor R3 and the fourth resistor R4 to reach the second resistor R2; the circuit gain G3 of the gradient compensation module at this time is: g3= R2/(R1/R3/R4). Obviously, the gain for high frequencies is larger than the gain for medium and high frequencies.
When the frequency of the input audio signal is in an ultrahigh frequency interval, current flows through the first resistor R1, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 to reach the second resistor R2; the circuit gain G4 of the gradient compensation module at this time is: g4= R2/(R1/R3/R4/R5). Clearly, the gain at ultra high frequencies is greater than the gain at high frequencies.
Referring to fig. 6, a circuit diagram of an interior of a phase compensation module according to an embodiment of the present disclosure is shown.
The phase compensation module that this application embodiment provided includes: the circuit comprises a second amplifier A2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a fourth capacitor C4.
The negative input end of the second amplifier A2 is connected with the output end of the buffer module through a sixth resistor R6.
The negative input end of the second amplifier A2 is connected with the output end of the second amplifier A2 through a seventh resistor R7; the output end of the second amplifier A2 is used as the output end of the phase compensation module.
The positive input end of the second amplifier A2 is connected to the output end of the buffer module through an eighth resistor R8.
The positive input of the second amplifier A2 is grounded through a fourth capacitor R4.
The specific resistance values of the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are not specifically limited in the present application, and for convenience of calculation, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 may adopt the same resistance value.
Referring to fig. 7, a circuit diagram of an interior of a buffer module according to an embodiment of the present application is shown.
The buffer module that this application embodiment provided can be specifically voltage follower, includes promptly: a third amplifier A3.
The positive input end of the third amplifier A3 is used as the input end of the buffer module; the negative input end of the third amplifier A3 is connected with the output end of the third amplifier A3; the output terminal of the third amplifier A3 serves as the output terminal of the buffer module.
The voltage follower has the characteristics of high input resistance and low output resistance, and can prevent the output end impedance of the gradient compensation module from influencing the transfer function of the phase compensation module.
The loudspeaker sounding phase-frequency compensation device provided by the embodiment of the application further comprises a main control module, an audio power amplification module and a buffer module; the main control module sends an audio signal to the audio power amplification module; the audio power amplification module amplifies the audio signal and inputs the amplified audio signal to the gradient compensation module; the buffer module buffers the audio signal output by the gradient compensation module and inputs the audio signal to the phase compensation module, so that the influence of the output end impedance of the gradient compensation module on the function of the phase compensation module is avoided, and the phase compensation is more accurate.
Based on the speaker sound production phase frequency compensation arrangement that above embodiment provided, this application embodiment still provides an intelligence large screen, combines the figure to describe in detail below.
Referring to fig. 8, the figure is a schematic view of an intelligent large screen according to an embodiment of the present application.
The big screen of wisdom that this application embodiment provided except including: the above embodiment describes the speaker sound phase frequency compensation device 1000, which further includes a speaker 2000.
The specific components and working principles of the speaker sound phase frequency compensation device 1000 can be referred to the above embodiments, and are not described herein again.
The speaker 2000 is located at the back of the screen of the smart large screen, and the sound emitting direction of the speaker 2000 is on at least one side of the periphery of the screen.
The speaker sound production phase frequency compensation device 1000 is connected to the speaker 2000, and performs phase frequency compensation on an audio signal before sound production by the speaker 2000.
According to the intelligent large screen provided by the embodiment of the application, the loudspeaker adopts a side sounding mode, and the loudspeaker sounding phase frequency compensation device performs frequency response compensation and phase compensation on an audio signal before sounding of the loudspeaker, so that when the side of the loudspeaker makes a sound, frequency response attenuation and phase difference of a medium-high frequency signal are compensated; the tone quality of the output sound of the intelligent large screen is improved, so that the sound production of the intelligent large screen is clear and bright; can ensure the design beauty and the acoustic effect at the same time.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A speaker sounding phase-frequency compensation device is characterized by comprising a gradient compensation module and a phase compensation module;
the gradient compensation module is used for performing frequency response compensation on the input signal according to the frequency of the input audio signal, and the frequency response compensation gradient is in direct proportion to the frequency of the input audio signal;
the phase compensation module is used for performing phase compensation on the signal subjected to the gradient compensation, and the compensated phase is in direct proportion to the frequency of the signal subjected to the gradient compensation;
and the signal output by the phase compensation module is transmitted to a loudspeaker.
2. The apparatus of claim 1, wherein the gradient compensation module comprises: the circuit comprises a first amplifier, a first resistor, a second resistor, a first impedance branch, a second impedance branch and a third impedance branch;
the negative input end of the first amplifier is connected with the output end of the first amplifier through the second resistor; the output end of the first amplifier is used as the output end of the gradient compensation module; the positive input end of the first amplifier is grounded;
the input audio signal is input into the negative input end of the first amplifier through the first resistor;
the first impedance branch, the second impedance branch and the third impedance branch are all connected to two ends of the first resistor in parallel;
the impedances presented by the first impedance branch, the second impedance branch and the third impedance branch are different.
3. The apparatus of claim 2, wherein the first impedance branch comprises a first capacitor and a third resistor connected in series, the second impedance branch comprises a second capacitor and a fourth resistor connected in series, and the third impedance branch comprises a third capacitor and a fifth resistor connected in series;
the capacitance values of the second capacitor and the third capacitor are the same and are both smaller than that of the first capacitor;
the resistance value of the third resistor is smaller than that of the fifth resistor, and the resistance value of the fifth resistor is smaller than that of the fourth resistor.
4. The apparatus of claim 1, wherein the phase compensation module comprises: the second amplifier, the sixth resistor, the seventh resistor, the eighth resistor and the fourth capacitor;
the negative input end of the second amplifier is connected with the output end of the gradient compensation module through the sixth resistor;
the negative input end of the second amplifier is connected with the output end of the second amplifier through the seventh resistor; the output end of the second amplifier is used as the output end of the phase compensation module;
the positive input end of the second amplifier is connected with the output end of the gradient compensation module through the eighth resistor;
the positive input end of the second amplifier is grounded through the fourth capacitor.
5. The apparatus of claim 4, wherein the sixth resistor, the seventh resistor, and the eighth resistor have the same resistance.
6. The apparatus for compensating for phase frequency of a loudspeaker utterance according to any one of claims 1 to 5, further comprising: the audio power amplifier module is connected between the input audio signal and the gradient compensation module;
and the audio power amplification module is used for amplifying the input audio signal and transmitting the amplified signal to the gradient compensation module.
7. The apparatus for compensating for phase frequency of a loudspeaker utterance according to any one of claims 1 to 5, further comprising: a buffer module connected between the gradient compensation module and the phase compensation module;
the buffer module is used for reducing the output end impedance of the gradient compensation module.
8. The apparatus of claim 7, wherein the buffer module comprises: a voltage follower.
9. The apparatus of claim 6, further comprising: a main control module;
the main control module is used for outputting the input audio signal to the audio power amplifier module.
10. A smart large screen comprising the speaker sound emission phase frequency compensation device according to any one of claims 1 to 9, further comprising: a speaker;
the loudspeaker is positioned at the back of the screen of the intelligent large screen, and the sound emitting direction of the loudspeaker is positioned on at least one side face of the periphery of the screen;
the loudspeaker sound production phase frequency compensation device is connected with the loudspeaker and used for performing phase frequency compensation on the audio signal before the sound production of the loudspeaker.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222979017.9U CN218788834U (en) | 2022-11-09 | 2022-11-09 | Loudspeaker sounding phase frequency compensation device and intelligent large screen |
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| CN202222979017.9U CN218788834U (en) | 2022-11-09 | 2022-11-09 | Loudspeaker sounding phase frequency compensation device and intelligent large screen |
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