CN218788835U - Electronic and power mixed frequency division audio device - Google Patents

Abstract

The application discloses electron and mixed audio frequency device of frequency division of power, including preceding stage circuit module, electron frequency division module, bass unit module, power frequency division module, well sound unit module and high pitch unit module. The electronic frequency division module is coupled with the preceding stage circuit module, is used for dividing a low-frequency signal in the audio signal, and is coupled with the electronic frequency division module and used for receiving the audio signal except the low-frequency signal and dividing the intermediate-frequency signal and the high-frequency signal. The utility model provides an audio frequency device low frequency signal of mixed frequency division of electron and power and intermediate frequency signal's division passes through electron frequency division, and intermediate frequency signal passes through power frequency division with the division of high frequency signal, and the mixed frequency division of two frequency division modes has avoided dividing the problem that low frequency signal divides the distortion seriously, and the loss is high through power frequency division.

Description

Electronic and power mixed frequency division audio device

Technical Field

The utility model relates to an audio frequency device technical field especially relates to an electron and mixed audio frequency device of frequency division of power.

Background

In order to meet the requirements of users on the sound quality, the sound audio section needs to cover 20Hz to 20KHz as far as possible. If the audio signal of wide frequency range so adopts single vibrating diaphragm sound production, the burden is very big, and high middle and low frequency range is difficult to compromise simultaneously, can not better restore the tone quality.

Therefore, the audio signals in the wide frequency range need to be subjected to frequency division processing and then transmitted to the multiple vibrating diaphragms for sounding, and the audio signals are divided into low-frequency signals, intermediate-frequency signals and high-frequency signals through frequency division. The existing device adopts power frequency division for medium and low frequency division, and when the frequency division point of medium and low frequencies is lower, the power low frequency division has serious distortion and high loss.

At present, a new frequency division method is needed to solve the problems of severe distortion and high loss of low frequency division.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide an electronic and power mixed frequency division audio device to solve the problems of serious low frequency division distortion and high loss.

In order to solve the above technical problem, an embodiment of the present invention provides an electronic and power mixed frequency division audio device, which includes a pre-stage circuit module, an electronic frequency division module, a bass unit module, a power frequency division module, a middle-tone unit module, and a treble unit module; the front stage circuit module is used for receiving an audio signal; the electronic frequency division module is coupled with the preceding stage circuit module and is used for dividing a low-frequency signal in the audio signal; the bass unit module is coupled with the electronic frequency division module and used for receiving the low-frequency signal and then sounding; the power frequency division module is coupled with the electronic frequency division module and used for receiving audio signals except the low-frequency signals and dividing the intermediate-frequency signals and the high-frequency signals; the middle tone unit module is coupled with the power frequency division module and used for receiving the middle frequency signal and then sounding, and the high tone unit module is coupled with the power frequency division module and used for receiving the high frequency signal and then sounding.

In one possible implementation, the front-stage circuit module includes a first buffer circuit and an amplifying circuit, the first buffer circuit is coupled to the amplifying circuit, the first buffer circuit is connected to the audio signal input device and used for isolating impedance influence of the audio signal input device, and the amplifying circuit is used for amplifying the audio signal; the amplifying circuit is coupled with the electronic frequency dividing module.

In one possible implementation, the electronic crossover module includes: the low-pass filter circuit and the high-pass filter circuit are both coupled with the preceding-stage circuit module, and the low-pass filter circuit is coupled with the bass unit module.

In one possible implementation, the electronic frequency-dividing module further includes: the first attenuation circuit is used for reducing the level value of the audio signal so as to achieve the best receiving effect of the middle-pitch unit module and the high-pitch unit module, and the second buffer circuit is used for isolating the impedance influence of the rear circuit.

In one possible implementation, the electronic frequency-dividing module further includes: and the first trap circuit is coupled with the second buffer circuit and is used for enabling the frequency dividing points of the intermediate frequency signal and the low frequency signal to be transited uniformly.

In one possible implementation, the electronic frequency-dividing module further includes: audio power amplifier circuit, audio power amplifier circuit include bass power amplifier circuit and well high pitch power amplifier circuit, and bass power amplifier circuit is coupled low pass filter circuit and bass unit module, and well high pitch power amplifier circuit is coupled first trap circuit and power frequency division module, and audio power amplifier circuit is used for carrying out power amplification to the audio signal after dividing.

In one possible implementation, the power dividing module includes: the passive low-pass filter circuit and the passive high-pass filter circuit are both coupled with the electronic frequency division module, the passive low-pass filter circuit is coupled with the middle-pitch unit module, and the passive high-pass filter circuit is coupled with the high-pitch unit module.

In one possible embodiment, the passive high-pass filter circuit further includes a second notch circuit, the second notch circuit is coupled to the electronic frequency dividing module, and the second notch circuit is used for making the frequency dividing point transition of the high-frequency signal and the intermediate-frequency signal uniform.

In a possible embodiment, the passive high-pass filter circuit further comprises a second attenuation circuit, the second attenuation circuit is coupled to the second notch circuit, and the second attenuation circuit is used for reducing the level value of the high-frequency signal to ensure that the best receiving effect of the high-pitch unit module is achieved.

In one possible implementation, the low-pass filter circuit is a fourth-order Ning Kewei z rayleigh low-pass filter circuit, the high-pass filter circuit is a fourth-order Ning Kewei z rayleigh low-pass filter circuit, and the cross frequency division point of the low-pass filter circuit and the high-pass filter circuit is smaller than that of the passive low-pass filter circuit and the passive high-pass filter circuit.

The beneficial effect of this application is: the electronic and power mixing frequency division audio device comprises a preceding stage circuit module, an electronic frequency division module, a bass unit module, a power frequency division module, a middle tone unit module and a high tone unit module; the front stage circuit module is used for receiving an audio signal; the electronic frequency division module is coupled with the preceding stage circuit module and is used for dividing a low-frequency signal in the audio signal; the bass unit module is coupled with the electronic frequency division module and is used for receiving the low-frequency signal and then sounding; the power frequency division module is coupled with the electronic frequency division module and used for receiving audio signals except the low-frequency signals and dividing the intermediate-frequency signals and the high-frequency signals; the middle tone unit module is coupled with the power frequency division module and used for receiving the middle frequency signal and then making a sound, and the high tone unit module is coupled with the power frequency division module and used for receiving the high frequency signal and then making a sound. The electronic and power mixed frequency division audio device low-frequency signal and intermediate-frequency signal's of this application division passes through the electron frequency division, and the intermediate-frequency signal passes through the power frequency division with high-frequency signal's division, and the frequency division is mixed to two frequency division modes, has avoided dividing the problem that the low-frequency signal divides the distortion seriously, and the loss is high through the power frequency division.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic diagram of an embodiment of an audio apparatus with mixed frequency division of electronic and power according to the present application;

FIG. 2 is a schematic diagram of a prior stage circuit module according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an embodiment of an electronic frequency-dividing module according to the present application;

FIG. 4 is a graph of frequency and loudness gain for the low pass filter circuit and the high pass filter circuit of the present application;

FIG. 5 is a schematic diagram of an embodiment of a first trap of the present application;

fig. 6 is a schematic structural diagram of an embodiment of a power divider module according to the present application.

Reference numerals: 100. an electronic and power mix-divided audio device; 101. a front stage circuit module; 102. an electronic frequency division module; 103. a power frequency division module; 104. a high pitch unit module; 105. a middle voice unit module; 106. a bass unit module; UA1, a first buffer circuit; UA2, an amplifying circuit; UA3, a low-pass filter circuit; UA4, a high-pass filter circuit; UA5 and a second buffer circuit; 117. a first attenuation circuit; 118. a first trap circuit; UA6 and a second trap circuit; UA7, a passive high-pass filter circuit; UA8, a passive low-pass filter circuit; 127. a second attenuation circuit.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plural" includes at least two in general, but does not exclude the presence of at least one.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

In the existing audio device, power frequency division is adopted for the frequency division of the bass, and when the frequency division point is lower, the distortion of the power low-frequency division is serious and the loss is high.

The utility model provides an electron and power mix audio frequency device of frequency division carries out the low frequency division through the electron frequency division, can effectively solve above-mentioned technical problem, combines the figure and embodiment to carry out detailed description to the audio frequency device of an electron and power mix frequency division that this application provided below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an audio device with frequency division by mixing electronic and power according to the present application. In a specific embodiment, the audio apparatus 100 with mixed frequency division of electronic and power of the present application includes a front stage circuit module 101, an electronic frequency division module 102, a bass unit module 106, a power frequency division module 103, a middle unit module 105 and a treble unit module 104.

The front-stage circuit module 101 is used for receiving an audio signal; the electronic frequency division module 102 is coupled to the preceding stage circuit module 101, and the electronic frequency division module 102 is configured to divide a low-frequency signal from the audio signal; the bass unit module 106 is coupled to the electronic frequency division module 102, and is configured to receive the low-frequency signal and then generate a sound; the power frequency division module 103 is coupled to the electronic frequency division module 102, and is configured to receive an audio signal other than the low-frequency signal and divide the intermediate-frequency signal and the high-frequency signal; the middle tone unit module 105 is coupled to the power frequency division module 103 for receiving the middle frequency signal and then generating a sound, and the high tone unit module 104 is coupled to the power frequency division module 103 for receiving the high frequency signal and then generating a sound. Specifically, the preceding stage circuit module 101 is externally connected with an audio signal input device, the audio signal input device may be a mobile phone, a computer, or other terminal device, the audio signal input device will include a low-frequency signal, the audio signal of the intermediate-frequency signal and the high-frequency signal is transmitted to the preceding stage circuit module 101, and then transmitted to the electronic frequency division module 102 by the preceding stage circuit module 101. The electronic frequency division of the electronic frequency division module 102 belongs to signal frequency division, and is to divide an audio signal into signals of various frequency bands, transmit the signals of the various frequency bands to other modules after power amplification, and divide a low-frequency signal by the electronic frequency division. After other audio signals except the low-frequency signal are transmitted to the power frequency division module 103, the power frequency division module 103 divides the remaining audio signals into an intermediate-frequency signal and a high-frequency signal, and transmits the intermediate-frequency signal and the high-frequency signal to the corresponding intermediate-tone unit module 105 and the high-tone unit module 104 for sounding. The power frequency division aims at achieving low pass and high pass through the filtering effect of the inductor and the capacitor of the power frequency division to achieve the frequency division purpose, the frequency division is carried out on signals after power amplification, the power frequency division module 103 is used for carrying out power frequency division to divide intermediate-frequency signals and high-frequency signals, and the power frequency division circuit has the advantages that the power frequency division circuit is simpler than a circuit of electronic frequency division, the problems of power loss and distortion cannot exist when the frequency division point is higher, and the power frequency division circuit is simpler to install and lower in cost.

Different from the prior art, the audio device 100 with mixed frequency division of the electronic and power divides the low-frequency signal and the intermediate-frequency signal through electronic frequency division, divides the intermediate-frequency signal and the high-frequency signal through power frequency division, and divides the frequency in a two-frequency division mode, so that the problems of serious low-frequency division distortion and high loss are avoided.

In this embodiment, the midrange unit module 106, the midrange unit module 105 and the tweeter unit module 104 are speakers capable of playing audio signals of different frequency bands.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a front-stage circuit module 101 according to an embodiment of the present application. In some embodiments, the front stage circuit module 101 includes a first buffer circuit UA1 and an amplifying circuit UA2, the first buffer circuit UA1 is coupled to the amplifying circuit UA2, the first buffer circuit UA1 is connected to the audio signal input device and is configured to isolate an impedance influence of the audio signal input device, and the amplifying circuit UA2 is configured to amplify the audio signal; the amplifying circuit UA2 is coupled to the electronic frequency dividing module 102. Specifically, in the present embodiment, the front stage module 101 is used for receiving an audio signal input device and the electronic frequency dividing module 102. The first buffer circuit UA1 is connected with an audio signal input device, the first buffer circuit UA1 is composed of a voltage follower formed by an operational amplifier, the input end of the first buffer circuit UA1 is connected with the audio signal input device, the output end of the first buffer circuit UA1 is connected with the amplifying circuit UA2, and the voltage follower is characterized in that when the impedance of the input end is very high, the impedance of the output end is low, the output voltage is constantly close to 1 compared with the input voltage, and the first buffer circuit UA1 is arranged to filter the impedance influence of the audio signal input device and improve the tone quality. The amplifying circuit UA2 is an in-phase proportional amplifying circuit UA2 for amplifying a small signal of an input audio signal, and the amplification factor Au =1+ R4/R3.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the electronic frequency-dividing module 102 according to the present application. The electronic frequency-dividing module 102 includes a low-pass filter circuit UA3 and a high-pass filter circuit UA4. The low-pass filter circuit UA3 and the high-pass filter circuit UA4 are both coupled to the front-stage circuit module 101, and the low-pass filter circuit UA3 is coupled to the bass unit module 106. Specifically, in this embodiment, the low-pass filter circuit UA3 of the electronic frequency division module 102 is a fourth-order Ning Kewei z rayleigh low-pass filter circuit UA3, and the high-pass filter circuit UA4 is a fourth-order Ning Kewei z rayleigh high-pass filter circuit UA4. The low-pass filter circuit UA3 comprises two operational amplifiers Op3 and Op4 which are connected in series, a forward input end of Op3 is connected with a capacitor C2 and then connected with the front-stage circuit module 101, a negative input end of Op3 is connected with a resistor R6 and then connected with the front-stage circuit module 101, the resistor R6 is connected with the capacitor C2 in parallel, a positive input end of Op3 is further connected with a capacitor C1 and then grounded, a resistor R5 is connected between the resistor R6 and the front-stage circuit module 101 in series, the low-pass filter circuit UA3 is described by taking Op3 as an example, when C2=2C1 and R5= R6, the cut-off frequency fc =1/2 pi R C and the quality factor Q =0.707 at this time; when C2 > 2C1, the Q value is increased; on the contrary, the Q value decreases, and when R5 and R6 are adjusted, the Q value decreases. The operational amplifier parameter setting of op4 is the same as that of op3, and the cut-off frequency of the low-pass filter circuit UA3 is changed by adjusting the resistance-capacitance value of the circuit. The parameter setting and calculation of the high-pass filter circuit UA4 are similar to those of UA3, and are not described herein again.

Further, since the bass unit module 106 and the midrange unit module 105 are connected in parallel at the bass frequency division point, the loudness is increased by 6dB, which may cause the frequency response curve at the frequency division point to be uneven. In this embodiment, when the frequency dividing point of the low-frequency signal is 200Hz, the capacitance value is adjusted to make the cutoff frequency of the low-pass filter circuit UA3 be 283.4Hz, and the capacitance value is adjusted to make the cutoff frequency of the high-pass filter circuit UA4 be 122.5Hz. Referring to fig. 4, fig. 4 is a graph of frequency and loudness gain of the low-pass filter circuit UA3 and the high-pass filter circuit UA4, and is a graph of frequency and loudness gain when the cut-off frequency of the low-pass filter circuit UA3 is 283.4Hz and the cut-off frequency of the high-pass filter circuit UA4 is 122.5Hz. As can be obtained from fig. 4, when the cutoff frequency of the low-pass filter circuit UA3 is adjusted to be 283.4Hz and the cutoff frequency of the high-pass filter circuit UA4 is adjusted to be 122.5Hz, both the low-pass filter circuit UA3 and the high-pass filter circuit UA4 are just attenuated by 6dB at the frequency dividing point of 200Hz, and then the attenuated 6dB is offset by 6dB of loudness increase in parallel connection between the bass unit module 106 and the bass unit module 105 by the design, so that the frequency response curve at the frequency dividing point is finally flat, and the sound quality is effectively improved. Finally, audio signals in the range of 20Hz-20000Hz pass through the electronic frequency dividing module 102, signals with frequencies below 200Hz flow into the bass unit module 106, and signals with frequencies above 200Hz flow into the power frequency dividing module 103.

In some other embodiments, the electronic divide-by-module further includes a first attenuation circuit 107 and a second buffer circuit UA5. The high-pass filter circuit UA4, the first attenuation circuit 107 and the second buffer circuit UA5 are sequentially coupled in series, the first attenuation circuit 107 is used for reducing the level value of the audio signal so as to achieve the best receiving effect of the middle-pitched unit module 105 and the high-pitched unit module 104, and the second buffer circuit UA5 is used for isolating the impedance influence of the post-circuit. Specifically, after the audio signal passes through the high-pass filter circuit UA4, the low-frequency signal is filtered, the intermediate-frequency signal and the high-frequency signal are received by the following intermediate-pitch unit module 105 and the high-pitch unit module 104 through the first attenuation circuit 107, and the first attenuation circuit 107 is arranged to attenuate the sensitivity of the intermediate-pitch unit module 105 and the high-pitch unit module 104 when the sensitivity of the intermediate-pitch unit module 105 and the high-pitch unit module 104 is higher than that of the low-pitch unit module 106, so that the curve is smooth, wherein the first attenuation circuit 107 comprises a resistor R13 and a resistor R14, the resistor R13 receives the high-pass filter circuit UA4 and the second buffer circuit UA5, one end of the resistor R14 is connected with the resistor R13, and the other end is grounded. The attenuation value was 20 × log (R13/(R13 + R14)). The second buffer circuit UA5 and the first buffer circuit UA1 have similar structures and are not described in detail, where the first buffer circuit UA1 is used to isolate the impedance influence of the audio signal input device, and the second buffer circuit UA5 is used to isolate the impedance influence of the post-circuit.

Further, in order to avoid the delay introduced by the physical layout differences between bass unit module 106 and alt unit module 105 or alt unit module 104, and the filtering effect of crossover circuits, etc., there may be an extra phase difference between alt unit module 105 and alt unit module 104 and bass unit module 106, and there may be different degrees of amplitude superposition or attenuation near the dividing point, in some other embodiments, electronic dividing module 102 further includes a first notch circuit 118, first notch circuit 118 is coupled to second buffer circuit UA5, and first notch circuit 118 is used to make the dividing point transition of the intermediate frequency signal and the low frequency signal uniform. Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the first trap circuit 118. As shown in FIG. 5, the first trap circuit 118 is a double T circuit, consisting of three resistors: r15, R16, R17; three capacitors: c9 C10 and C11. In the present embodiment, R15= R16= R17, C9= C10= C11; in other embodiments, the center frequency fc and the attenuation characteristics of the first notch circuit 118 can be changed by adjusting the RC values. The unevenness of the frequency response curve at the division point of the midrange unit module 105 and the bass unit module 106 can be compensated by attenuating the frequency of the midrange signal and the frequency of the midrange signal at the division point of the low frequency signal by the notch line.

In some other embodiments, electronic crossover module 102 further includes an audio power amplifier circuit. The audio power amplifier circuit comprises a bass power amplifier circuit and a medium-high pitch power amplifier circuit, the bass power amplifier circuit is coupled with the low-pass filter circuit UA3 and the bass unit module 106, the medium-high pitch power amplifier circuit is coupled with the first trap circuit 118 and the power frequency division module 103, and the audio power amplifier circuit is used for performing power amplification on divided audio signals. Specifically, the bass power amplifier circuit is configured to perform power amplification on the low-frequency signal passing through the low-pass filter circuit UA3, and transmit the low-frequency signal to the bass unit module 106. The medium-high frequency power amplifier circuit is used for amplifying the power of the medium-frequency signal and the high-frequency signal passing through the high-pass filter circuit UA4 and transmitting the amplified signals to the power frequency division module 103. The bass power amplifier circuit and the medium-high-pitch power amplifier circuit can be integrated circuits for realizing power amplification in the same style, or integrated circuits for realizing power amplification in any different models, and are not particularly limited.

Referring to fig. 6, fig. 6 is a schematic structural diagram of the power divider module 103 according to an embodiment of the present disclosure. In some embodiments, power frequency dividing module 103 includes a passive low-pass filter circuit UA8 and a passive high-pass filter circuit UA7, where passive low-pass filter circuit UA8 and passive high-pass filter circuit UA7 are both coupled to electronic frequency dividing module 102, passive low-pass filter circuit UA8 is coupled to alto unit module 105, and passive high-pass filter circuit UA7 is coupled to alto unit module 104. Specifically, the power dividing module 103 further divides the audio signals except for the low frequency signals. The passive low-pass filter circuit UA8 filters the high-frequency signal to allow the intermediate-frequency signal to pass through, and the passive high-pass filter circuit UA7 filters the intermediate-frequency signal to allow the high-frequency signal to pass through. The passive low-pass filter circuit UA8 is a second-order passive low-pass filter circuit UA8 and comprises an inductor L201, a capacitor C202 and a resistor R201; the resistor R201 is connected in series with the capacitor C202 and then connected in parallel with the capacitor C201, and the inductor L201 receives the electronic frequency dividing module 102, the capacitor C201 and the capacitor C202. The passive high-pass filter circuit UA7 is a second-order passive high-pass filter circuit UA7, and is also composed of a resistance-capacitance device and an inductance device which are connected in series and in parallel, and the devices comprise: the series-parallel relationship among the capacitor C104, the capacitor C105, the capacitor R106, the inductor L101 is not described in detail. The power frequency division is that a capacitance device and an inductance device form an LC filter network to filter signals with specific frequency, and compared with an electronic frequency division circuit, the circuit is simpler.

In this embodiment, the frequency dividing point of the high-frequency signal is 2000Hz, the attenuation value at the frequency dividing point of the high-frequency signal is also 6dB, and the parameter values of the inductance device and the capacitance device can be calculated according to the frequency dividing point and the attenuation frequency of the high-frequency signal, where the calculation formula is as follows: c104=86523/Zf, L101=170Z/f; l201=296Z/f; c201=148000/Zf; z is the impedance of the midrange unit module 105 and the treble unit module 104, and f is the frequency of the high-frequency signal division point. And adjusting the device parameters of the passive low-pass filter circuit UA8 and the passive high-pass filter circuit UA7 according to the calculated parameter values of the inductance device and the capacitance device. The frequency dividing point of the high frequency signal is not limited to 2000Hz, and may be other values such as 1900Hz,1950Hz,2100Hz, etc., and the device parameters may be adjusted after being calculated according to the device parameters, which is not specifically limited.

Similarly, there is a difference in layout between the midrange unit module 105 and the tweeter unit module 104, and there is a delay introduced by the filtering effect of the crossover circuit, there is an additional phase difference between the midrange unit module 105 and the tweeter unit module 104, there is a different degree of amplitude superposition or attenuation near the dividing point of the high frequency signal, to avoid this problem, in some embodiments, the passive high-pass filter circuit UA7 further includes a second notch circuit UA6, the second notch circuit UA6 is coupled to the electronic crossover module 102, and the second notch circuit UA6 is used to make the dividing point transition of the high frequency signal and the midrange signal uniform. The second notch circuit UA6 is similar to the first notch circuit 118 in structure and will not be described in detail. The second trap circuit UA6 is composed of three resistors: r101, R102, R103; three capacitors: c101 C102 and C103. In the present embodiment, R101= R102= R103, and C101= C102= C103, wherein the center frequency and the attenuation characteristic of the first notch circuit 118 can be changed by adjusting the resistance-capacitance value.

Further, the middle-pitch unit module 105 and the high-pitch unit module 104 are inductive load elements, for the audio signal of the alternating current signal, the impedance of the middle-pitch unit module 105 and the high-pitch unit module 104 changes with the frequency change, and when the frequency rises, the impedance becomes higher and higher, the middle-pitch unit module 105 and the high-pitch unit module 104 have higher damping, and the high damping affects the frequency division of the sound signal. In this embodiment, R201 and C202 in the passive low-pass filter circuit UA8 are connected in series to form an impedance compensation circuit for compensating the impedance in the passive low-pass filter circuit UA8 to be flat, and R106 and C105 in the passive high-pass filter circuit UA7 are connected in series to form an impedance compensation circuit for compensating the impedance in the passive high-pass filter circuit UA7 to be flat, where the resistance-capacitance value parameters of the device in fig. 6 are calculated as follows: r201= Z1; c202= 213800/(f (Z1 +2 pi fL 1)); r106= Z2; c105= 213800/(f (Z2 +2 pi fL 2)); in the above formula, Z1 and Z2 are impedance values of the midrange unit module 105 and the high-range unit module 104, respectively, f is a high-range crossover frequency, and L1 and L2 are inductance values of the voice coils in the midrange unit module 105 and the high-range unit module 104, respectively.

In order to ensure the flatness of the frequency response curve of the full frequency band, in some embodiments, the passive high-pass filter circuit UA7 further includes a second attenuation circuit 127, the second attenuation circuit 127 is coupled to the second notch circuit UA6, and the second attenuation circuit 127 is configured to reduce the level value of the high-frequency signal, so as to ensure the best receiving effect of the high-pitch unit module 104. Specifically, the second attenuation circuit 127 is composed of a resistor R104 and a resistor R105, the resistor R104 is connected in series to the integrated circuit, and the resistor R105 is connected in parallel to the integrated circuit, and the final attenuation value is 20 × log (R105/(R104 + R105)). The specific parameter values of R104 and R105 may be adaptively adjusted according to the sensitivity difference between the middle-pitched unit module 105 and the high-pitched unit module 104, and are not particularly limited.

It can be understood that, in the present embodiment, the crossover frequency division point of the low-pass filter circuit UA3 and the high-pass filter circuit UA4 is smaller than the crossover frequency division point of the passive low-pass filter circuit UA8 and the passive high-pass filter circuit UA 7. Specifically, the crossing frequency division points of the low-pass filter circuit UA3 and the high-pass filter circuit UA4 are smaller than the crossing frequency division points of the passive low-pass filter circuit UA8 and the passive high-pass filter circuit UA7 through component parameter adjustment. The low-pass filter circuit UA3 and the high-pass filter circuit UA4 divide low-frequency signals, and the passive low-pass filter circuit UA8 and the passive high-pass filter circuit UA7 divide high-frequency signals.

Different from the prior art, the audio device 100 with mixed frequency division of the electronic and power divides the low-frequency signal and the intermediate-frequency signal through electronic frequency division, divides the intermediate-frequency signal and the high-frequency signal through power frequency division, and divides the frequency in a two-frequency division mode, so that the problems of serious distortion and high loss of the low-frequency signal divided through the power frequency division are solved.

The above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all modifications that can be made by using equivalent structures or equivalent principles in the contents of the specification and the drawings or directly or indirectly applied to other related technical fields are also included in the scope of the present application.

Claims (10)

1. An electronic and power crossover audio device, comprising:

a pre-stage circuit module for receiving an audio signal;

the electronic frequency division module is coupled with the preceding-stage circuit module and is used for dividing a low-frequency signal in the audio signal;

the bass unit module is coupled with the electronic frequency division module and used for receiving the low-frequency signal and then generating sound;

the power frequency dividing module is coupled with the electronic frequency dividing module and used for receiving the audio signals except the low-frequency signals and dividing intermediate-frequency signals and high-frequency signals;

the middle-tone unit module is coupled with the power frequency division module and used for receiving the sound generated after the middle-frequency signal, and the high-tone unit module is coupled with the power frequency division module and used for receiving the sound generated after the high-frequency signal.

2. The electronic and power divide-by-mix audio device of claim 1,

the pre-stage circuit module comprises a first buffer circuit and an amplifying circuit, the first buffer circuit is coupled with the amplifying circuit, the first buffer circuit is connected with an audio signal input device and used for isolating the impedance influence of the audio signal input device, and the amplifying circuit is used for amplifying the audio signal; wherein the amplifying circuit is coupled with the electronic frequency dividing module.

3. The electronic and power divide-by-mix audio device of claim 1, wherein the electronic divide-by-mix module comprises:

the low-pass filter circuit and the high-pass filter circuit are both coupled to the preceding stage circuit module, and the low-pass filter circuit is coupled to the bass unit module.

4. The electronic and power divide-by-mix audio device of claim 3, wherein the electronic divide-by-mix module further comprises:

first decay circuit and second buffer circuit, high pass filter circuit, first decay circuit, second buffer circuit connects in series in proper order and couples, first decay circuit is used for reducing audio signal's level value, in order to reach the well sound unit module with the best receiving effect of high sound unit module, second buffer circuit is used for keeping apart the impedance influence of postcircuit.

5. The electronic and power divide-by-mix audio device of claim 4, wherein the electronic divide-by-module further comprises:

a first notch circuit coupled to the second buffer circuit, the first notch circuit configured to make a division point transition of the intermediate frequency signal and the low frequency signal uniform.

6. The electronic and power divide-by-mix audio device of claim 5, wherein the electronic divide-by-module further comprises:

audio frequency power amplifier circuit, audio frequency power amplifier circuit includes bass power amplifier circuit and well high pitch power amplifier circuit, bass power amplifier circuit is coupled low pass filter circuit with bass unit module, well high pitch power amplifier circuit is coupled first notch circuit with power frequency division module, audio frequency power amplifier circuit is used for after to the division audio signal carries out power amplification.

7. The electronic and power divide-by-mix audio device of claim 3, wherein the power divide-by-mix module comprises:

the passive low-pass filter circuit and the passive high-pass filter circuit are both coupled to the electronic frequency division module, the passive low-pass filter circuit is coupled to the middle-tone unit module, and the passive high-pass filter circuit is coupled to the high-tone unit module.

8. The electronic and power mix-divided audio device of claim 7,

the passive high-pass filter circuit further comprises a second notch circuit, the second notch circuit is coupled to the electronic frequency dividing module, and the second notch circuit is used for enabling the frequency dividing points of the high-frequency signal and the intermediate-frequency signal to be transited uniformly.

9. The electronic and power divide-by-mix audio device of claim 8,

the passive high-pass filter circuit further comprises a second attenuation circuit, the second attenuation circuit is coupled with the second trap circuit, and the second attenuation circuit is used for reducing the level value of the high-frequency signal so as to ensure that the best receiving effect of the high-pitch unit module is achieved.

10. The electronic and power divide-by-mix audio device of claim 7,

the low-pass filter circuit is a fourth-order Ning Kewei Z-Rayle low-pass filter circuit, the high-pass filter circuit is a fourth-order Ning Kewei Z-Rayle low-pass filter circuit, and the cross frequency dividing point of the low-pass filter circuit and the high-pass filter circuit is smaller than the cross frequency dividing point of the passive low-pass filter circuit and the passive high-pass filter circuit.

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