CN114094972A - Frequency-division filter and electronic equipment - Google Patents
Frequency-division filter and electronic equipment Download PDFInfo
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- CN114094972A CN114094972A CN202010864155.5A CN202010864155A CN114094972A CN 114094972 A CN114094972 A CN 114094972A CN 202010864155 A CN202010864155 A CN 202010864155A CN 114094972 A CN114094972 A CN 114094972A
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Abstract
The embodiment of the application provides a frequency division filter and electronic equipment, and the frequency division filter comprises: the first frequency dividing branch circuit and the second frequency dividing branch circuit are connected in parallel between the input end and the output end, the first frequency dividing branch circuit comprises a first filter and a phase regulator, the first filter outputs signals in a first frequency range in input signals, the phase regulator adds a phase of a first angle to the signals in the first frequency range, the second filter in the second frequency dividing branch circuit outputs signals in a second frequency range in the input signals, the signals output by the first filter and the signals output by the second filter have a phase difference of a second angle, and the sum of the first angle and the second angle is an integral multiple of 360 degrees, so that there is no phase difference between the signal of the first frequency range output by the first frequency-dividing branch and the signal of the second frequency range output by the second frequency-dividing branch, so that the frequency division filter can divide the frequency of the input signal to form frequency band data without phase difference during synthesis.
Description
Technical Field
The present application relates to the field of signal processing technologies, and in particular, to a frequency division filter and an electronic device including the same.
Background
At present, in the process of digital signal processing, a section of digital signal may be complex, so that the digital signal needs to be divided into different frequency bands for independent processing, however, after the same input signal is divided into signals of different frequency bands for independent processing, phase differences may exist between data of each frequency band, so that when signals of each frequency band which are processed independently are added, data of each frequency band may have a problem of offset addition, which causes time domain data of the combined signal to be disordered. How to make the data of each frequency band separated from the same input signal have no phase difference when they are synthesized after independent frequency division processing in frequency division signal processing becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a frequency division filter and an electronic device, so that in the frequency division signal processing, there is no phase difference when the data of each frequency band divided from the same input signal is synthesized after the frequency division processing.
In order to achieve the above purpose, the present application provides the following technical solutions:
a frequency-division filter comprising:
the frequency dividing filter comprises a first frequency dividing branch and a second frequency dividing branch which are connected in parallel between an input end and an output end, wherein the input end is the input end of the frequency dividing filter and used for inputting an input signal, and the output end is the output end of the frequency dividing filter and used for outputting an output signal;
the first frequency-dividing branch comprises a first filter and a phase adjuster, the first filter is used for outputting signals in a first frequency range in the input signals, and the phase adjuster is used for adding a phase of a first angle to the signals output by the first filter;
the second frequency dividing branch comprises a second filter, and the second filter is used for outputting signals of a second frequency range in the input signals;
wherein the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, and the sum of the first angle and the second angle is an integral multiple of 360 °.
Optionally, the first filter is a low-pass filter, and the signal in the first frequency band range is a signal smaller than a preset frequency in the input signal;
the second filter is a high-pass filter, and the signal in the second frequency range is a signal with a frequency greater than a preset frequency in the input signal.
Optionally, the first filter is a high-pass filter, and the signal in the first frequency band range is a signal greater than a preset frequency in the input signal;
the second filter is a low-pass filter, and the signal in the second frequency range is a signal with a frequency smaller than a preset frequency in the input signal.
Optionally, the input signal is an analog signal.
Optionally, the input signal is a digital signal.
Optionally, the first filter is a second-order filter, the second angle is 180 °, and the first angle is an odd multiple of 180 °.
Optionally, the phase adjuster comprises at least one multiplier.
Optionally, the first angle is 180 °.
Optionally, the method further includes:
and the signal synthesizer is used for synthesizing the signal output by the first frequency dividing branch and the signal output by the second frequency dividing branch.
Optionally, the signal synthesizer is an adding signal synthesizer, and is configured to add the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch to obtain the output signal of the frequency-dividing filter.
A frequency-division filter comprising:
the frequency dividing filter comprises a first frequency dividing branch and a second frequency dividing branch which are connected in parallel between an input end and an output end, wherein the input end is the input end of the frequency dividing filter and used for inputting an input signal, and the output end is the output end of the frequency dividing filter and used for outputting an output signal;
the first frequency-dividing branch comprises a first filter, and the first filter is used for outputting signals of a first frequency range in the input signals;
the second frequency dividing branch comprises a second filter, and the second filter is used for outputting signals of a second frequency range in the input signals;
the signal synthesizer is used for subtracting the signal output by the first frequency-dividing branch circuit and the signal output by the second frequency-dividing branch circuit to obtain the output signal;
wherein the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, the second angle being an odd multiple of 180 °.
Correspondingly, the embodiment of the application also provides an electronic device comprising the frequency division filter.
The frequency division filter provided by the embodiment of the application comprises: the first frequency dividing branch and the second frequency dividing branch are connected in parallel between an input end and an output end, the first frequency dividing branch comprises a first filter and a phase regulator, the first filter is used for outputting signals in a first frequency range in the input signals, the phase regulator is used for adding a phase of a first angle to the signals output by the first filter, the second frequency dividing branch comprises a second filter, the second filter is used for outputting signals in a second frequency range in the input signals, the signals output by the first filter and the signals output by the second filter have a phase difference of a second angle, the sum of the first angle and the second angle is an integral multiple of 360 degrees, and as the phase is in a period of 360 degrees, no phase difference exists between the signals output by the first frequency dividing branch and the signals output by the second frequency dividing branch, and then the frequency division filter carries out frequency division processing on the input signal to form frequency range data, and no phase difference exists when the frequency range data is resynthesized.
In addition, in the frequency division filter provided by the application, only one first filter, one second filter and one phase regulator are needed, and the phase regulator is used for carrying out phase regulation on the signal output by the first filter, so that no phase difference exists between the signal output by the first frequency division branch and the signal output by the second frequency division branch in the frequency division filter, the structure is simple, the calculated amount is small, and therefore when the frequency division filter is applied to a signal processing system needing more frequency division filters, the structure of the signal processing system can be greatly simplified, and the calculated amount of the signal processing system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a prior art crossover filter;
fig. 2 is a schematic structural diagram of a crossover filter according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a crossover filter according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a crossover filter according to another embodiment of the present application;
FIG. 5 is a graph of the magnitude of a second order low pass filter and a second order high pass filter as a function of frequency;
FIG. 6 is a graph of the phase of a second order low pass filter and a second order high pass filter as a function of frequency;
fig. 7 is a schematic structural diagram of a crossover filter according to yet another embodiment of the present application.
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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
As described in the background section, how to make the frequency-divided signal processing have no phase difference when the data of each frequency band divided from the same input signal is synthesized after the independent frequency division processing, is a technical problem to be solved by those skilled in the art.
Referring to fig. 1, fig. 1 is a schematic diagram showing a structure of a prior art crossover filter, which includes a high frequency branch 3 and a low frequency branch 4 connected in parallel between an input terminal 1 and an output terminal 2, where the input terminal 1 is an input terminal 1 of the crossover filter, for inputting an input signal, said output 2 being an output 2 of said crossover filter for outputting an output signal, wherein, the high-frequency branch circuit 3 comprises two second-order high-pass Butterworth filters 6 for outputting signals with signal amplitude in a high-frequency range in the input signals, due to the characteristics of the high-pass filter, the output signal in the corresponding high-frequency band range is not attenuated, the low frequency branch 4 comprises two second order low pass Butterworth filters 8, and the device is used for outputting the signal with the signal amplitude in the low frequency band range in the input signal so as to divide the input signal into two different frequency bands for independent processing.
It should be noted that, when the conventional frequency division filter divides an input signal into different frequency bands for independent processing, no matter the high frequency branch or the low frequency branch, two second-order filters are required to enable a signal output by the high frequency branch and a signal output by the low frequency branch to have no phase difference, so that when the conventional frequency division filter divides the input signal into two different frequency bands for processing, at least four second-order filters are required, the structure is complex, and the cost is high.
In addition, in the frequency division signal processing system, the number of filters is large, and occupied resources and overhead are large, so that the structure of the existing frequency division signal processing system is very complex, and the resource cost is high.
Based on this, the application provides a frequency division filter, so as to simplify the structure of the frequency division filter and reduce the calculation amount of the frequency division filter, thereby greatly simplifying the structure of a signal processing system, reducing the calculation amount of the signal processing system and reducing the resource cost of the signal processing system when the frequency division filter is applied to the signal processing system which needs more frequency division filters.
The following describes a crossover filter provided in an embodiment of the present application with reference to the drawings.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a frequency-dividing filter according to an embodiment of the present application, where the frequency-dividing filter includes a first frequency-dividing branch 30 and a second frequency-dividing branch 40 connected in parallel between an input terminal 10 and an output terminal 20; wherein the input terminal 10 is an input terminal 10 of the frequency division filter, and is used for inputting an input signal; the output end 20 is an output end 20 of the frequency division filter, and is used for outputting an output signal; the first frequency-dividing branch 30 comprises a first filter 31 and a phase adjuster 32, the first filter 31 is configured to output a signal in a first frequency range in the input signal, and the phase adjuster 32 is configured to add a phase of a first angle to the signal output by the first filter; the second frequency dividing branch 40 includes a second filter 41, and the second filter 41 is configured to output a signal in a second frequency range of the input signal, where the first frequency range is different from the second frequency range. In this embodiment, the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, the sum of the first angle and the second angle is an integral multiple of 360 °, and since the phase is 360 ° in a cycle, there is no phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch.
Therefore, in the frequency division filter provided by the embodiment of the present application, the phase adjuster is added in the first frequency division branch, and the phase adjuster is used to adjust the phase of the signal output by the first filter, so that the phase difference between the signal output by the first frequency division branch and the signal output by the second frequency division branch is an integral multiple of 360 °, and when the signal output by the first frequency division branch and the signal output by the second frequency division branch are superposed again, there is no phase difference, and a phenomenon of time domain data disorder is not generated.
Moreover, the frequency division filter provided by the application only needs a first filter, a second filter and a phase adjuster before synthesizing the signal output by the first frequency division branch and the signal output by the second frequency division branch, and the phase adjuster adjusts the phase of the signal output by the first filter, so that no phase difference exists between the signal output by the first frequency division branch and the signal output by the second frequency division branch in the frequency division filter.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 3, the first filter 31 is a low-pass filter, the signal in the first frequency range is a signal smaller than a preset frequency in the input signal, the second filter 41 is a high-pass filter, and the signal in the second frequency range is a signal larger than the preset frequency in the input signal. Wherein the preset frequency is a cut-off frequency of the low-pass filter and the high-pass filter.
It should be noted that, because the low-pass filter cannot completely block signals higher than its cutoff frequency from passing through, but only can attenuate the amplitude of signals higher than its cutoff frequency, and similarly, the high-pass filter cannot completely block signals lower than its cutoff frequency from passing through, but only can attenuate the amplitude of signals lower than its cutoff frequency, when the frequency division filter provided in the embodiment of the present application divides the frequency input to its input terminal, the signal output by the first frequency division branch and the signal output by the second frequency division branch may both be the full frequency band of the signal input by the input terminal, but only the signal amplitude of a partial frequency band of the signal output by the first frequency division branch and the signal output by the second frequency division branch is the same as the amplitude of the signal input by the input terminal of the frequency division filter, and no attenuation occurs. Specifically, in the embodiment of the present application, the amplitude of the signal lower than the cutoff frequency of the signal output by the first frequency-dividing branch is not attenuated, and the amplitude of the signal higher than the cutoff frequency of the signal output by the second frequency-dividing branch is attenuated.
In the description of this application, for the convenience of description, will the frequency band that signal amplitude does not take place the decay in the signal of first frequency dividing branch road output is first frequency band scope for short, will the frequency band that signal amplitude does not take place the decay in the signal of second frequency dividing branch road output is second frequency band scope for short, promptly first frequency band scope does signal amplitude does not take place the frequency band of decay in the signal of first frequency dividing branch road output, second frequency band scope does signal amplitude does not take place the frequency band of decay in the signal of second frequency dividing branch road output.
Specifically, in this embodiment of the application, in actual operation of the frequency-division filter, when the input signal is input to the input terminal, the input signal is filtered by using the first filter in the first frequency-division branch, and since the low-pass filter does not attenuate the amplitude of the signal smaller than the preset frequency, but only attenuates the amplitude of the signal larger than the preset frequency, the signal in the first frequency band range whose amplitude is not attenuated in the signal output by the first filter is the signal smaller than the preset frequency in the signal input to the input terminal, that is, the signal in the first frequency band range is the signal smaller than the preset frequency in the input signal; when the input signal is input to the input end, the second filter in the second frequency-dividing branch is used for filtering the input signal, and because the high-pass filter does not attenuate the amplitude of the signal greater than the preset frequency, but only attenuates the amplitude of the signal less than the preset frequency, the signal in the second frequency band range, of which the amplitude is not attenuated, in the signal output by the second filter is the signal greater than the preset frequency in the signal input by the input end, that is, the signal in the second frequency band range is the signal greater than the preset frequency in the input signal, so as to ensure that the input signal is divided into the signal in the first frequency band range and the signal in the second frequency band range, which are different in frequency band range.
It should be noted that, in the above embodiment, the first frequency dividing branch includes a low pass filter and a phase adjuster, the phase adjuster is configured to add a phase of a first angle to a signal output by the low pass filter, that is, when the input signal is transmitted along the signal transmission direction of the first frequency dividing branch, the input signal passes through the low pass filter first and then passes through the phase adjuster, the second frequency dividing branch includes only a high pass filter, that is, when the input signal is transmitted along the signal transmission direction of the second frequency dividing branch, the input signal passes through only the high pass filter, so that when the frequency dividing filter is in operation, the phase adjuster can be used to perform phase adjustment on the signal output by the low pass filter, and the phase adjuster does not perform phase adjustment on the signal output by the high pass filter, so that a phase difference between the signal output by the first frequency dividing branch and the signal output by the second frequency dividing branch is an integer multiple of 360 °, therefore, when the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch are superposed, no phase difference exists, and the phenomenon of time domain data disorder cannot be caused.
In another embodiment of the present application, as shown in fig. 4, the first filter 31 is a high-pass filter, and the signal in the first frequency band range is a signal greater than a preset frequency in the input signal, that is, the signal in the first frequency band range whose amplitude is not attenuated in the signal output by the first frequency-dividing branch is a signal greater than the preset frequency in the signal input by the input end thereof; the second filter 41 is a low-pass filter, and the signal in the second frequency band range is a signal smaller than a preset frequency in the input signal, that is, the signal in the second frequency band range whose amplitude is not attenuated in the signal output by the second frequency-dividing branch is a signal smaller than the preset frequency in the signal input by the input end thereof.
Specifically, in this embodiment of the application, in actual operation of the frequency-dividing filter, when the input signal is input to the input terminal, the input signal is filtered by using the first filter in the first frequency-dividing branch, because the high-pass filter does not attenuate the amplitude of the signal greater than the preset frequency, but only attenuates the amplitude of the signal less than the preset frequency, the signal in the first frequency band range whose amplitude is not attenuated in the signal output by the first filter is the signal greater than the preset frequency in the signal input to the input terminal, that is, the signal in the first frequency band range is the signal greater than the preset frequency in the input signal; when the input signal is input to the input end, the second filter in the second frequency-dividing branch is used for filtering the input signal, and because the low-pass filter does not attenuate the amplitude of the signal smaller than the preset frequency, but only attenuates the amplitude of the signal larger than the preset frequency, the signal in the second frequency band range with unattenuated amplitude in the signal output by the second filter is the signal smaller than the preset frequency in the signal input by the input end, that is, the signal in the second frequency band range is the signal smaller than the preset frequency in the input signal, so as to ensure that the input signal is divided into the signal in the first frequency band range and the signal in the second frequency band range with different frequency band ranges.
It should be noted that, in the above embodiment, the first frequency dividing branch includes a high pass filter and a phase adjuster, the phase adjuster is configured to add a phase of a first angle to a signal output by the high pass filter, that is, when the input signal is transmitted along the signal transmission direction of the first frequency dividing branch, the input signal passes through the high pass filter first and then passes through the phase adjuster, the second frequency dividing branch includes only a low pass filter, that is, when the input signal is transmitted along the signal transmission direction of the second frequency dividing branch, the input signal passes through only the low pass filter, that is, when the frequency dividing filter is in operation, the phase adjuster can be used to perform phase adjustment on the signal output by the high pass filter, and the phase adjuster does not perform phase adjustment on the signal output by the low pass filter, so that a phase difference between the signal output by the first frequency dividing branch and the signal output by the second frequency dividing branch is an integer multiple of 360 °, therefore, when the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch are superposed, no phase difference exists, and the phenomenon of time domain data disorder cannot be caused.
It should be noted that, in the embodiment of the present application, in order to simplify the structure of the frequency dividing filter, the frequency dividing filter is provided with a phase adjuster only in the first frequency dividing branch, the phase adjustment is performed on the signal output by the first filter in the first frequency-dividing branch, without adding a phase adjuster in the second frequency-dividing branch, and without performing the phase adjustment on the signal output by the second filter in the second frequency-dividing branch, but the present application is not limited thereto, in other embodiments of the present application, the frequency-division filter may further add a phase adjuster to the first frequency-division branch and the second frequency-division branch at the same time, and simultaneously performing phase adjustment on signals output by the first filter and the second filter, so that the phase difference of the signals output by the first frequency dividing branch and the second frequency dividing branch is an integral multiple of 360 degrees, as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present application, the input signal is a digital signal, but the present application does not limit this, and in other embodiments of the present application, the input signal may also be an analog signal, as the case may be. Next, taking the input signal as a digital signal as an example, the description continues on the frequency division filter provided in the embodiment of the present application.
On the basis of the above embodiments, in an embodiment of the present application, the first filter is a second-order filter, the second angle is 180 °, and the first angle is an odd multiple of 180 °.
Specifically, in an embodiment of the present application, the second order filter is a second order Butterworth filter (i.e., a second order Butterworth filter), but the present application is not limited thereto, and in other embodiments of the present application, the second order filter may also be another type of second order filter, and it is only necessary to ensure that a phase difference between the signal in the first frequency band range and the signal in the second frequency band range output from the second order filter is 180 °.
With continued reference to fig. 3, in one embodiment of the present application, the first filter 31 is a second-order low-pass filter and the second filter 41 is a second-order high-pass filter.
Specifically, as shown in fig. 5 and fig. 6, fig. 5 and fig. 6 are Bode D plots (i.e., logarithmic frequency characteristic plots) of the second-order filter, specifically, fig. 5 is a plot of the amplitude of the second-order filter changing with frequency, fig. 6 is a plot of the phase of the second-order filter changing with frequency, wherein in fig. 5 and fig. 6, a solid line is a plot of the second-order low-pass filter, and a dotted line is a plot of the second-order high-pass filter.
As can be seen from fig. 5 and 6, the phase difference between the signal output by the second-order high-pass filter and the signal output by the second-order low-pass filter at each frequency point is 180 °, specifically, in an embodiment of the present application, when the input signal is input to the input end, the phase change curve of the signal in the first frequency band range along with the frequency corresponds to the solid line in fig. 6, the phase change curve of the signal in the second frequency band range along with the frequency corresponds to the dotted line in fig. 6, by using the signal in the first frequency band range output by the first filter in the first frequency-dividing branch, that is, the signal in the first frequency band range output by the second filter in the second frequency-dividing branch, that is, the signal in the second frequency band range output by the second-order high-pass filter, as can be seen from fig. 6, the phase difference between the signal output by the first filter and the signal output by the second filter at each frequency point is 180 °, that is, the second angle is 180 °.
Therefore, in the frequency-dividing filter provided in this embodiment of the present application, when an input signal is transmitted along the transmission direction of the first frequency-dividing branch, a phase adjuster is disposed behind the second-order low-pass filter, and a phase of a first angle is added to a signal output by the second-order low-pass filter, where the first angle is an odd multiple of 180 °, and a sum of the first angle and the second angle is an integer multiple of 360 °, so that a phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch is an integer multiple of 360 °, which is not limited in this application, in other embodiments of the present application, the second angle may be another angle as long as the sum of the first angle and the second angle is an integer multiple of 360 °, so that there is no phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch when the signals are combined, namely, the frequency division filter carries out frequency division processing on the input signal to form data of each frequency band, and no phase difference exists when the data of each frequency band is resynthesized.
Similarly, with reference to fig. 4, in another embodiment of the present application, when the first filter 31 is a second-order high-pass filter and the second filter 41 is a second-order low-pass filter, the frequency-division filter provided in the embodiment of the present application still can make the signal output by the first frequency-division branch and the signal output by the second frequency-division branch have no phase difference when they are synthesized, that is, the frequency-division filter performs frequency-division processing on the input signal to form frequency-band data, and then synthesizes the frequency-band data, and there is no phase difference when it is synthesized again.
Therefore, the frequency division filter provided by the embodiment of the application performs frequency division processing on an input signal of the frequency division filter, so that the amplitude of an output signal of the first frequency division branch is not attenuated in the first frequency range, and the amplitude of an output signal of the second frequency division branch is not attenuated in the second frequency range, only two second-order filters and one phase regulator are needed, so that no phase difference exists between the signal output by the first frequency division branch and the signal output by the second frequency division branch during frequency division processing of the frequency division filter, the structure is simple, the calculated amount is small, and when the frequency division filter is applied to a signal processing system requiring more frequency division filters, the structure of the signal processing system can be greatly simplified, and the calculated amount of the signal processing system is reduced.
On the basis of the above embodiments, in an embodiment of the present application, the phase adjuster includes at least one multiplier, and optionally, the phase adjuster includes an odd multiple of the multipliers, so that the phase adjuster adds a phase of the odd multiple of 180 ° to the signal output by the first filter, so that a phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch is an integer multiple of 360 °. However, this is not limited in this application, and in other embodiments of the present application, the phase adjuster may also adopt other structures to add a phase of an odd multiple of 180 ° to the signal output by the first filter, as the case may be.
Specifically, in an embodiment of the present application, the first filter is a low pass filter, the second filter is a high pass filter, and the phase of the signal output by the high pass filter is 180 ° greater than the phase of the signal output by the low pass filter, and therefore, in an embodiment of the present application, the phase adjuster includes a multiplier that multiplies the signal output by the first filter by-1 so that the amplitude of the signal output by the first filter becomes an inverted value, thereby adding a phase of-180 ° to the signal output by the first filter so that the phase of the signal output by the high pass filter is 360 ° greater than the phase of the signal output by the phase adjuster, so as to ensure that the phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch is 360 °.
Similarly, in another embodiment of the present application, if the first filter is a high pass filter, the second filter is a low pass filter, and the phase of the signal output by the low pass filter is-180 ° different from the phase of the signal output by the high pass filter, the phase adjuster includes a multiplier, and the multiplier is used to add-180 ° phase to the signal output by the first filter, so that the phase of the signal output by the high pass filter is 0 ° different from the phase of the signal output by the low pass filter, thereby ensuring no phase difference between the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch.
On the basis of any of the above embodiments, in an embodiment of the present application, with continued reference to fig. 2, the crossover filter further includes a signal synthesizer 50, where the signal synthesizer 50 is configured to synthesize the signal output by the first crossover branch and the signal output by the second crossover branch to obtain an output signal of the crossover filter.
Optionally, on the basis of any one of the foregoing embodiments, in an embodiment of the present application, the signal synthesizer 50 is an addition signal synthesizer, and is configured to add the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch to obtain an output signal of the frequency-dividing filter.
It should be noted that, since the adding signal synthesizer is configured to add the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch, and multiply the signal output by the first frequency-dividing branch by-1, and then add the signal output by the second frequency-dividing branch to the signal output by the second frequency-dividing branch, which is equivalent to subtracting the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch, in another embodiment of the present application, the phase adjuster in the first frequency-dividing branch may be integrated with the signal synthesizer, and directly subtract the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch to obtain the output signal of the frequency-dividing filter, so that there is no phase difference when the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch are synthesized, the phenomenon of time domain data disorder can not be generated. Specifically, in the embodiment of the present application, as shown in fig. 7, the first frequency-dividing branch includes only the first filter, and the signal synthesizer 50 is a subtraction signal synthesizer.
Specifically, in the embodiment of the present application, as shown in fig. 7, the frequency division filter includes:
a first frequency-dividing branch and a second frequency-dividing branch connected in parallel between an input terminal 10 and an output terminal 20, wherein the input terminal 10 is the input terminal 10 of the frequency-dividing filter and is used for inputting an input signal, and the output terminal 20 is the output terminal 20 of the frequency-dividing filter and is used for outputting an output signal;
the first frequency-dividing branch 30 comprises a first filter 31, and the first filter 31 is configured to output a signal in a first frequency range in the input signal;
the second frequency dividing branch 40 includes a second filter 41, where the second filter 41 is configured to output a signal in a second frequency range of the input signal, and the first frequency range and the second frequency range are different;
a signal synthesizer 50, where the signal synthesizer 50 is configured to subtract the signal output by the first frequency-dividing branch from the signal output by the second frequency-dividing branch to obtain the output signal;
wherein the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, the second angle being an odd multiple of 180 °.
Correspondingly, an embodiment of the present application further provides an electronic device, where the electronic device includes the crossover filter provided in any of the embodiments.
In summary, the frequency division filter provided in the embodiment of the present application can perform frequency division processing on an input signal, and enable data of each frequency band formed after the frequency division processing to have no phase difference during synthesis, so as to avoid a phenomenon that time domain data is disturbed due to the phase difference during synthesis of the data of each frequency band formed after the frequency division processing during the frequency division processing of the signal.
In addition, the frequency division filter provided by the application only needs one first filter, one second filter, one phase regulator and one signal synthesizer, and the phase regulator adjusts the phase of the signal output by the first filter, so that the signal output by the first frequency division branch and the signal output by the second frequency division branch have no phase difference when being synthesized in the signal synthesizer.
It should be noted that, when the phase difference between the signal output by the first filter and the signal output by the second filter is an odd multiple of 180 degrees, when the frequency division filter provided by the application only needs one first filter, one second filter and one signal synthesizer, the signal synthesizer is a subtraction signal synthesizer to obtain the output signal of the frequency division filter by subtracting the signal output by the first frequency division branch and the signal output by the second frequency division branch, and the signal output by the first frequency-dividing branch and the signal output by the second frequency-dividing branch have no phase difference when being synthesized, the phenomenon of time domain data disorder can not be generated, the structure is simple, the calculated amount is small, therefore, when the method is applied to a signal processing system which needs more frequency division filters, the structure of the signal processing system can be greatly simplified, and the calculation amount of the signal processing system is reduced.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
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 frequency-division filter, comprising:
the frequency dividing filter comprises a first frequency dividing branch and a second frequency dividing branch which are connected in parallel between an input end and an output end, wherein the input end is the input end of the frequency dividing filter and used for inputting an input signal, and the output end is the output end of the frequency dividing filter and used for outputting an output signal;
the first frequency-dividing branch comprises a first filter and a phase adjuster, the first filter is used for outputting signals in a first frequency range in the input signals, and the phase adjuster is used for adding a phase of a first angle to the signals output by the first filter;
the second frequency dividing branch comprises a second filter, and the second filter is used for outputting signals of a second frequency range in the input signals;
wherein the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, and the sum of the first angle and the second angle is an integral multiple of 360 °.
2. The crossover filter of claim 1, wherein the first filter is a low pass filter, and the signals in the first frequency band range are signals with less than a predetermined frequency in the input signal; the second filter is a high-pass filter, and the signal in the second frequency range is a signal with a frequency greater than a preset frequency in the input signal;
or, the first filter is a high-pass filter, and the signal in the first frequency band range is a signal with a frequency greater than a preset frequency in the input signal; the second filter is a low-pass filter, and the signal in the second frequency range is a signal with a frequency smaller than a preset frequency in the input signal.
3. The crossover filter of claim 1 or 2, wherein the input signal is an analog signal; or, the input signal is a digital signal.
4. The crossover filter of claim 3, wherein the first filter is a second order filter, the second angle is 180 °, and the first angle is an odd multiple of 180 °.
5. The crossover filter of claim 4, wherein the phase adjuster comprises at least one multiplier.
6. The crossover filter of claim 5, wherein the first angle is 180 °.
7. The crossover filter of claim 1, further comprising:
and the signal synthesizer is used for synthesizing the signal output by the first frequency dividing branch and the signal output by the second frequency dividing branch.
8. The crossover filter of claim 7, wherein the signal combiner is an add signal combiner configured to add the signal output by the first crossover branch and the signal output by the second crossover branch to obtain the output signal of the crossover filter.
9. A frequency-division filter, comprising:
the frequency dividing filter comprises a first frequency dividing branch and a second frequency dividing branch which are connected in parallel between an input end and an output end, wherein the input end is the input end of the frequency dividing filter and used for inputting an input signal, and the output end is the output end of the frequency dividing filter and used for outputting an output signal;
the first frequency-dividing branch comprises a first filter, and the first filter is used for outputting signals of a first frequency range in the input signals;
the second frequency dividing branch comprises a second filter, and the second filter is used for outputting signals of a second frequency range in the input signals;
the signal synthesizer is used for subtracting the signal output by the first frequency-dividing branch circuit and the signal output by the second frequency-dividing branch circuit to obtain the output signal;
wherein the signal output by the first filter and the signal output by the second filter have a phase difference of a second angle, the second angle being an odd multiple of 180 °.
10. An electronic device, characterized in that it comprises a crossover filter according to any of claims 1-9.
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