CN114095832A - Multi-section dynamic range control circuit, audio processing chip and audio processing method - Google Patents
Multi-section dynamic range control circuit, audio processing chip and audio processing method Download PDFInfo
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Abstract
The invention discloses a multi-section dynamic range control circuit, an audio processing chip and an audio processing method, wherein the multi-section dynamic range control circuit is provided with N parallel dynamic range control branches, the same audio input data can be divided into N different frequency bands and the N different frequency bands can be respectively regulated, each dynamic range control branch corresponds to one different frequency band and is used for regulating the corresponding frequency band to output corresponding output data, and target data regulated and controlled by the multi-section dynamic range can be output through an output module based on the output data of each dynamic range control branch. Therefore, the technical scheme of the invention can realize multi-section dynamic range regulation and control of the audio input data through a plurality of parallel dynamic range control branches. The multi-section dynamic range control circuit is simple in circuit structure and small in calculation amount.
Description
Technical Field
The invention relates to the technical field of sound processing, in particular to a multi-section dynamic range control circuit, an audio processing chip and an audio processing method.
Background
Dynamic Range Control (DRC) is an algorithm commonly used for controlling sound volume and volume, and can perform different processing in different energy Range intervals. In the process of processing digital audio signals, the digital signals are divided into frequency bands to independently perform dynamic range control processing, and then the dynamic range control processing is overlapped with the coming application requirements, and the processing process is multi-section dynamic range control (MBDRC).
Therefore, how to design a multistage dynamic range control circuit with simple structure and small calculation amount is an urgent problem to be solved in the technical field of sound processing.
Disclosure of Invention
In view of the above, the present application provides a multi-segment dynamic range control circuit, an audio processing chip and an audio processing method, and the scheme is as follows:
a multi-segment dynamic range control circuit, comprising:
the device comprises N parallel dynamic range control branches, a frequency control unit and a frequency control unit, wherein the N parallel dynamic range control branches are used for dividing the same audio input data into N different frequency bands and respectively regulating and controlling the N different frequency bands, and each dynamic range control branch corresponds to one different frequency band and is used for regulating and controlling the corresponding frequency band so as to output corresponding output data; n is a positive integer greater than 1;
the output module is used for outputting target data regulated and controlled by multiple sections of dynamic ranges based on the output data of each dynamic range control branch;
wherein the phase difference of the output data of each dynamic range control branch is 0.
Preferably, in the multi-stage dynamic range control circuit, the output module is configured to calculate a sum of output data of all the dynamic range control branches, and use the sum as the target data.
Preferably, in the multi-stage dynamic range control circuit, the output module is an adder.
Preferably, in the multi-stage dynamic range control circuit, the N dynamic range control branches are sequentially a 1 st branch to an nth branch, and all input the audio input data, and sequentially output a 1 st output data corresponding to a 1 st frequency band to an nth output data corresponding to an nth frequency band.
Preferably, in the multi-stage dynamic range control circuit, N dynamic range control branches are based on the 1 st frequency point Fc1To the N-1 frequency point FcN-1Inputting the audio frequency into dataDivided into N different frequency bands, the 1 st frequency point Fc1To the N-1 frequency point FcN-1And increases in turn.
Preferably, in the multi-stage dynamic range control circuit, the 1 st branch comprises a 1 st low-pass filter and a 1 st dynamic range control module which are connected in series;
the ith branch comprises an ith-1 high-pass filter, an ith low-pass filter and an ith dynamic range control module which are connected in series; i is a positive integer greater than 1 and less than N;
the Nth branch comprises an N-1 high-pass filter and an Nth dynamic range control module which are connected in series;
wherein, the cut-off frequencies from the 1 st low-pass filter to the N-1 st low-pass filter are the 1 st frequency point Fc in sequence1To the N-1 frequency point FcN-1(ii) a The cut-off frequencies from the 1 st high-pass filter to the N-1 st high-pass filter are sequentially the 1 st frequency point Fc1To the N-1 frequency point FcN-1(ii) a The 1 st dynamic range control module to the Nth dynamic range control module sequentially output the 1 st output data to the Nth output data.
Preferably, in the multi-stage dynamic range control circuit, the jth low-pass filter includes: two second order low-pass Butterworth filters in series;
the jth high-pass filter includes: two second order high pass butterworth filters in series;
wherein the phase difference between the second order low-pass Butterworth filter and the second order high-pass Butterworth filter is 180 DEG, and j is a positive integer smaller than N.
Preferably, in the multi-stage dynamic range control circuit, N is 5.
The invention also provides an audio processing chip, comprising:
the multi-segment dynamic range control circuit of any of the preceding claims.
The invention also provides an audio processing method of the audio processing chip, which comprises the following steps:
dividing the same audio input data into N different frequency bands and respectively regulating and controlling the N different frequency bands through N parallel dynamic range control branches, wherein each dynamic range control branch corresponds to one different frequency band and is used for regulating and controlling the corresponding frequency band so as to output corresponding output data; n is a positive integer greater than 1;
outputting target data regulated and controlled by multiple sections of dynamic ranges based on the output data of each dynamic range control branch;
wherein the phase difference of the output data of each dynamic range control branch is 0.
Preferably, in the audio processing method, the outputting target data subjected to multi-stage dynamic range control based on the output data of each of the dynamic range control branches includes:
and calculating the sum of the output data of all the dynamic range control branches, and taking the sum as the target data.
As can be seen from the above description, in the multi-segment dynamic range control circuit, the audio processing chip, and the audio processing method provided in the technical solution of the present invention, the multi-segment dynamic range control circuit is provided with N parallel dynamic range control branches, so that the same audio input data can be divided into N different frequency bands and the N different frequency bands can be respectively controlled, each of the dynamic range control branches corresponds to a different frequency band and is used for controlling the corresponding frequency band to output corresponding output data, and the output module can output target data after being controlled by the multi-segment dynamic range based on the output data of each of the dynamic range control branches. Therefore, the technical scheme of the invention can realize multi-section dynamic range regulation and control of the audio input data through a plurality of parallel dynamic range control branches. The multi-section dynamic range control circuit is simple in circuit structure and small in calculation amount.
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 embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention.
Fig. 1 is a schematic structural diagram of a multi-stage dynamic range control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another multi-stage dynamic range control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a multi-segment dynamic range control circuit according to an embodiment of the present invention;
fig. 4a is a schematic structural diagram of a low-pass filter according to an embodiment of the present invention;
fig. 4b is a schematic structural diagram of a high-pass filter according to an embodiment of the present invention;
FIG. 5 is an amplitude-frequency response curve for a cascade of two second order Butterworth filters;
FIG. 6 is a bode diagram of a second order Butterworth filter cascade;
fig. 7 is a flowchart illustrating a frequency processing method according to an embodiment of the present invention.
Detailed Description
The embodiments of the present application will be described in detail and fully with reference to the accompanying drawings, wherein the description is only for the purpose of illustrating the embodiments of the present application and is not intended to limit the scope of the invention. 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 order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a multi-segment dynamic range control circuit according to an embodiment of the present invention, where the multi-segment dynamic range control circuit includes: n parallel dynamic range control branches 11, where the dynamic range control branches 11 are configured to divide the same audio input data Din into N different frequency bands and respectively regulate and control the N different frequency bands, and each dynamic range control branch 11 corresponds to a different frequency band and is configured to regulate and control the corresponding frequency band to output corresponding output data; and the output module 12 is configured to output the target data Dout subjected to multi-segment dynamic range regulation and control based on the output data of each dynamic range control branch 11. Wherein the phase difference of the output data of each dynamic range control branch 11 is 0.
The multi-stage dynamic range control circuit of the embodiment of the invention realizes multi-stage dynamic range control on the audio input data Din through N parallel dynamic range control branches 11, and has simple circuit structure and small calculated amount. By setting the number of parallel branches and the implementation mode in each branch, more flexible multi-section dynamic range control over the audio input data Din can be realized, and the applicability is wider.
In the multi-stage dynamic range control circuit according to the embodiment of the present invention, the output module 12 is configured to calculate a sum of output data of all the dynamic range control branches 11, and use the sum as the target data. Wherein, the output module 12 is an adder.
Each dynamic range control branch 11 has an independent dynamic range control module, and the dynamic range control module is configured to perform gain processing on frequency band data corresponding to the branch to which the dynamic range control module belongs to form output data, and set compression time and release time based on the output data. The dynamic range control module includes a separate gain generator and gain smoothing module. The gain generator is used for adjusting corresponding gain according to input data; the gain smoothing processing module is used for processing the output gain of the gain generator and setting compression time and release time. The gain generator may be any one of a limiter, a compressor, an expander, and a noise removal effector. The dynamic range control module can multiply the output gain and the audio input data through a set circuit structure or a multiplier to obtain the output data of the dynamic range control branch. Therefore, each dynamic range control branch 11 can perform dynamic range control by an independent dynamic range control module, and the compression time and the release time can be set individually. Each dynamic range control branch 11 performs dynamic range control on the frequency division band of the audio input data Din, so that a better function of adjusting gain of the frequency division band in the field of digital audio processing is realized, the auditory sensation of phase disorder is avoided in the auditory sensation, and the sound size is not influenced by the amplitude response of a filter for frequency division in the branch.
As shown in fig. 1, the N dynamic range control branches 11 sequentially include a 1 st branch corresponding to a 1 st frequency band to an nth branch corresponding to an nth frequency band, all of which input the audio input data Din and sequentially output a 1 st output data Dout1To Nth output data DoutN. Each dynamic range control branch 11 can output the output data of the branch in which it is located through an independent dynamic range control module, so as to realize independent dynamic range control of each dynamic range control branch 11 on the corresponding frequency band data. In the two dynamic range control branches 11 corresponding to the two adjacent frequency bands, the phase difference is 0.
Setting N dynamic range control branches 11 based on 1 st frequency point Fc1To the N-1 frequency point FcN-1Dividing the audio input data Din into N different frequency bands, namely a 1 st frequency point Fc1To the N-1 frequency point FcN-1And increases in turn. The 1 st frequency point Fc can be determined through N-1 low-pass filters and N-1 high-pass filters1To the N-1 frequency point FcN-1Thus, the audio input data Din is divided into N different frequency bands, the number of filters used is small, and the calculation amount is small.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another multi-segment dynamic range control circuit according to an embodiment of the present invention, and the embodiment shown in fig. 2 is based on the manner shown in fig. 1In the 1 st branch comprises a 1 st low-pass filter LPF connected in series1And 1 st dynamic range control module DRC1(ii) a The ith branch comprises an i-1 high-pass filter HPF connected in seriesi-1I-th low pass filter LPFiAnd ith dynamic Range control Module DRCiIf i is 2, the 2 nd branch comprises a 1 st high-pass filter HPF connected in series12 nd low pass filter LPF2And 2 nd dynamic range control module DRC2(ii) a i is a positive integer greater than 1 and less than N; the Nth branch comprises an N-1 high-pass filter HPF connected in seriesN-1And an Nth dynamic Range control Module DRCN. The serial connection sequence of the high-pass filter and the low-pass filter in the same branch can be adjusted.
Wherein, the cut-off frequencies from the 1 st low-pass filter to the N-1 st low-pass filter are the 1 st frequency point Fc in sequence1To the N-1 frequency point FcN-1(ii) a The cut-off frequencies from the 1 st high-pass filter to the N-1 st high-pass filter are sequentially the 1 st frequency point Fc1To the N-1 frequency point FcN-1(ii) a Sequentially outputting 1 st output data Dout from the 1 st dynamic range control module to the Nth dynamic range control module1To Nth output data DoutN。
Since the 1 st branch has the 1 st low-pass filter LPF1The cut-off frequency is the 1 st frequency point Fc1The audio input data Din may be smaller than the 1 st frequency point Fc1The frequency range of (1) as the 1 st band.
As the ith branch comprises the frequency point Fc with the cut-off frequency of i-1i-1The i-1 high pass filter HPFi-1And the cut-off frequency is the ith frequency point FciI low pass filter LPF ofiThe frequency point Fc of i-1 in the audio input data Din may be obtainedi-1To the ith frequency point FciThe frequency range of (a) is used as the ith frequency band.
Since the Nth branch has an N-1 high-pass filter HPFN-1The cut-off frequency is the N-1 frequency point Fc1The audio input data Din may be larger than the N-1 frequency point FcN-1The frequency range of (1) is used as the nth frequency band.
As shown in FIG. 2, the multi-segment dynamic range control circuit according to the embodiment of the present inventionThe 1 st frequency point Fc can be determined by N-1 low-pass filters and N-1 high-pass filters1To the N-1 frequency point FcN-1Thus, the audio input data Din is divided into N different frequency bands, the number of filters used is small, and the amount of calculation is small.
In the multi-stage dynamic range control circuit according to the embodiment of the present invention, N may be set to 5, and dynamic range control of five frequency bands is implemented by 5 parallel dynamic range control branches. It should be noted that a value of N may be set based on a regulation requirement, and in the embodiment of the present invention, N may be any positive integer greater than 1, including but not limited to 5, and if N may be set to 3, 3-stage dynamic range control is implemented, or N may be set to 7, 7-stage dynamic range control is implemented.
When N is 5, the structure of the multi-stage dynamic range control circuit may be as shown in fig. 3, where fig. 3 is a schematic structural diagram of another multi-stage dynamic range control circuit provided in an embodiment of the present invention, and each branch determines a frequency band regulated by itself through a corresponding high-pass filter and/or low-pass filter.
For any mth branch, m is a positive integer not greater than N, and the regulation frequency band is the mth frequency band DinmMth dynamic Range control Module DRCmOutput mth output data Doutm. As shown in FIG. 3, the 1 st to 5 th branches have the 1 st output data Dout in sequence1To the 5 th output data Dout5The regulation frequency band is the 1 st frequency band Din in turn1To the 5 th frequency band Din5。
For the mode shown in fig. 3, the frequency point Fc is increased by the 1 st frequency point Fc1To the N-1 frequency point FcN-1Dividing an audio input number Din into 1-band Din1To the 5 th frequency band Din5And respectively carrying out dynamic range control on the five frequency bands through the 1 st branch to the 5 th branch. Wherein, the 1 st low pass filter LPF1To the 4 th low pass filter LPF4The cut-off frequency of the first frequency point is 1 st frequency point Fc in sequence1To the 4 th frequency point Fc4(ii) a 1 st high pass filter HPF1To the 4 th high-pass filter HPF4The cut-off frequency of the first frequency point is 1 st frequency point Fc in sequence1To the 4 th frequency point Fc4(ii) a 1 st dynamic Range control Module DRC1To the 5 th dynamic Range control Module DRC5Sequentially outputting the 1 st output data Dout1To Nth output data DoutN。
In the multi-stage dynamic range control circuit according to the embodiment of the present invention, the high pass filter may allow a signal having a frequency greater than a cutoff frequency thereof to pass therethrough and filter data having a frequency less than the cutoff frequency thereof, and the low pass filter may allow a signal having a frequency less than the cutoff frequency thereof to pass therethrough and filter data having a frequency greater than the cutoff frequency thereof. The structure of the N-1 low-pass filters and the N-1 high-pass filters can be as shown in fig. 4a and 4 b.
As shown in fig. 4a and 4b, fig. 4a is a schematic structural diagram of a low pass filter provided in an embodiment of the present invention, and fig. 4b is a schematic structural diagram of a high pass filter provided in an embodiment of the present invention, as shown in fig. 4a, a jth low pass filter LPFjThe method comprises the following steps: two second order low pass Butterworth (Butterworth) filters 21, a 1 st low pass filter LPF connected in series1To the N-1 low pass filter LPFN-1Each comprising two series-connected second-order low-pass Butterworth filters 21, as shown in FIG. 4b, a jth high-pass filter HPFjThe method comprises the following steps: two second-order high-pass Butterworth filters 22 connected in series, i.e. the 1 st high-pass filter HPF1To the N-1 high pass filter HPFN-1Each comprising two second order high pass butterworth filters 22 in series. Wherein, the phase difference between the second-order low-pass Butterworth filter 21 and the second-order high-pass Butterworth filter 22 is 180 degrees, and j is a positive integer smaller than N. The amplitude-frequency response curve of the cascade of two second-order butterworth filters in the filters of the configurations shown in fig. 4a and 4b is shown in fig. 5.
As shown in fig. 5, fig. 5 is an amplitude-frequency response curve of two cascaded second-order butterworth filters, wherein the horizontal axis of fig. 5 represents frequency f and the vertical axis represents amplitude Gain. The dotted line is an amplitude-frequency response curve of the cascade connection of a second-order high-pass/low-pass Butterworth filter in the same branch, and the amplitude-frequency response curve are attenuated by 6dB at a frequency point fc position. The curve obtained by superimposing the two dotted lines is the solid horizontal line in fig. 5. One second order filter attenuates by-3 dB at the position of the frequency point fc, so that two second order filters are connected in series and attenuate by-6 dB at the position of the frequency point fc. It can be seen that the amplitude of the solid line at any frequency is 0 dB. Therefore, two second-order high-pass Butterworth filters are connected in series to serve as a high-pass filter, two second-order low-pass Butterworth filters are connected in cascade to serve as low-pass filters (namely N-1 low-pass filters and N-1 high-pass filters in the embodiment of the invention), the N-1 low-pass filters and the N-1 high-pass filters serve as frequency dividers to divide frequency bands, amplitude adjustment of finally superposed target data Dout cannot be generated, and the amplitude of the target data Dout is guaranteed to be adjusted only by parameters of a dynamic range control module of each frequency band.
As shown in fig. 6, fig. 6 is a bode diagram of a second order butterworth filter cascade, the upper diagram is a graph of the amplitude of the filter as a function of Frequency, the lower diagram is a graph of the phase of the filter as a function of Frequency, the horizontal axis in fig. 6 represents the Frequency, the vertical axis in the upper diagram represents the amplitude, and the vertical axis in the lower diagram represents the phase. In fig. 6, the solid line represents the curve of the second-order low-pass butterworth filter, and the broken line represents the curve of the second-order high-pass butterworth filter. As can be seen from fig. 6, the phase difference between the frequency points of the second-order low-pass butterworth filter and the second-order high-pass butterworth filter is fixed at 180 °. The phase difference of the low-pass filter obtained by two second-order low-pass Butterworth filters connected in series and the high-pass filter obtained by two second-order high-pass Butterworth filters connected in series is 360 degrees, and the phase period is 360 degrees, so that the phase difference between the high-pass filter and the low-pass filter obtained by the cascade connection of the second-order low-pass Butterworth filters and the second-order high-pass Butterworth filters is 0 degrees, namely the high-pass filter and the low-pass filter in the same branch have no phase difference.
The multi-segment dynamic range control scheme according to the embodiment of the present invention will be further described with reference to the multi-segment dynamic range control circuit shown in fig. 3.
In the embodiment of the invention, the separation of the two adjacent frequency bands is realized by the low-pass filter in one branch and the high-pass filter with the same cut-off frequency in the other branch of the adjacent frequency bands, so that when the adjacent frequency bands are separated, no phase difference exists between data, and the amplitude value cannot be changed due to the amplitude adjustment of the filters.
For theAdjacent frequency bands, e.g. frequency band 1 Din1And 2 nd frequency band Din 21 st frequency band Din1And 2 nd frequency band Din2The separation is realized by the same cut-off frequency (the 1 st frequency point Fc)1) 1 st low pass filter LPF1And 1 st high pass filter HPF1Is implemented so that the adjacent 1 st frequency band Din1And 2 nd frequency band Din2When separated, there should be no phase difference between the data and, after addition, the amplitude should not change due to amplitude modulation by the filter.
But the 1 st frequency band Din1And 2 nd frequency band Din2In contrast, the 1 st band Din is due to the 2 nd branch having the 2 nd low pass filter LPF2 therein1And 2 nd frequency band Din2Are not uniform. Under normal application condition, the 1 st frequency point Fc1And 2 nd frequency point Fc2Have a certain difference in absolute value, so that the 1 st band Din1If the 2 nd frequency point Fc exists, the data in the step (2) is the data in2Around or above the 2 nd frequency point Fc2Is subjected to the 1 st low pass filter LPF1The filtration was very small. And 2 nd frequency band Din2Middle 2 frequency point Fc2The influence is small compared with the magnitude of the data energy nearby. Thus, the 1 st frequency point Fc1And 2 nd frequency point Fc2The phase of the frequency data of this segment is finally divided by the 2 nd frequency band Din2Phase determination of branch, other branches are at frequency point Fc of 1 st1To the 2 nd frequency point Fc2The frequency energy of the audio signals is filtered to be very small, and the audio signals cannot have disordered phase on the hearing sense after being superposed.
Frequency band 2 Din2And 3 rd frequency band Din3The separation is realized by the same cut-off frequency (2 nd frequency point Fc)2) 2 nd low pass filter LPF2And 2 nd high pass filter HPF2Is implemented so that the adjacent 2 nd frequency band Din2And 3 rd frequency band Din3When separated, there should be no phase difference between the data and, after addition, the amplitude should not change due to amplitude modulation by the filter.
Under normal application condition, the 1 st frequency point Fc12 nd frequency point Fc2Frequency point 3Fc3Have a certain difference in absolute value, so that the Din is set for the 3 rd frequency band3If the 1 st frequency point Fc exists, the data in the1Around or less than the 1 st frequency point Fc1Is subjected to the 2 nd high-pass filter HPF2The filtration was very small. And 2 nd frequency band Din2Middle 1 frequency point Fc1The influence is small compared with the magnitude of the data energy nearby. Frequency point 1 Fc1To the 2 nd frequency point Fc2The phase of the frequency data of the section is finally determined by the phase of the 2 nd branch, and other branches are at the 1 st frequency point Fc1To the 2 nd frequency point Fc2The frequency energy of the audio signals is filtered to be very small, and the audio signals cannot have disordered phase on the hearing sense after being superposed.
Din for 2 nd frequency band2If the data in the (3) frequency point Fc exists3Around or above the 3 rd frequency point Fc3Is filtered by the 2 nd low pass filter LPF2The filtration was very small. And 3 rd frequency band Din3Middle 3 frequency point Fc3The influence is small compared with the magnitude of the data energy nearby. Thus, the 2 nd frequency point Fc2To the 3 rd frequency point Fc3The phase of the frequency data of the section is finally determined by the phase of the 3 rd branch, and other branches are at the 2 nd frequency point Fc2To the 3 rd frequency point Fc3The frequency energy of the audio signals is filtered to be very small, and the audio signals cannot have disordered phase on the hearing sense after being superposed.
4 th frequency band Din4And the 5 th frequency band Din5The separation is realized by a 4 th low pass filter LPF with the same cut-off frequency (4 th frequency point Fc4)4And 4 th high-pass filter HPF4Is implemented so that the adjacent 4 th frequency band Din4And the 5 th frequency band Din5When separated, there should be no phase difference between the data and, after addition, the amplitude should not change due to amplitude modulation by the filter.
But the 4 th band Din4And the 5 th frequency band Din5In contrast, the 4 th branch has the effect of the 3 rd high pass filter HPF 3. The 4 th frequency band Din4And the 5 th frequency band Din5Are not uniform. Under normal application condition, the 3 rd frequency point Fc3And the 4 th frequency point Fc4Will have an absolute value ofA certain gap, therefore Din for the 5 th band5If the data in the (3) frequency point Fc exists3Around or less than the 3 rd frequency point Fc3Is subjected to the 4 th high pass filter HPF4The filtration was very small. And the 4 th frequency band Din4Middle 3 frequency point Fc3The influence is small compared with the magnitude of the data energy nearby. Thus, the 3 rd frequency point Fc3To the 4 th frequency point Fc4The phase of the frequency data of the section is finally determined by the phase of the 4 th branch, and other branches are at the 3 rd frequency point Fc3To the 4 th frequency point Fc4The frequency energy of the audio signals is filtered to be very small, and the audio signals cannot have disordered phase on the hearing sense after being superposed.
In the multi-stage dynamic range control circuit according to the embodiment of the present invention, for two branches adjacent to each other in frequency band, the high pass filter in one branch and the low pass filter in the other branch have the same cut-off frequency. Therefore, for the amplitude of the whole superimposed target data Dout, because the two adjacent frequency bands are separated by the high pass filter HPF and the low pass filter LPF of the same frequency point Fc, the superimposed amplitude is not affected (as shown in fig. 5). For data superposition in spaced frequency bands, e.g. Din in frequency band 11And 3 rd frequency band Din3Because the 1 st frequency point Fc1And 2 nd frequency point Fc2There is a certain gap between them, so for the 1 st band Din12 nd frequency point Fc2And 3 rd frequency point Fc3The frequency energy between the two is filtered to be very small, so that the 2 nd frequency point Fc is heard2And 3 rd frequency point Fc3Almost all of the frequency energy of (1) from the 3 rd frequency band Din3The contribution can ensure that the finally superposed target data has no listening feeling of phase disorder. The principle can be generalized to any frequency band at intervals, so the 1 st frequency band Din1To the 5 th frequency band Din5The superimposed target data Dout is audible, and the signal amplitude is not adjusted by the amplitude-frequency response of the filters of each section.
For the implementation of 5 frequency bands shown in fig. 3, only 16 second-order filters are used, the number of the filters is small, and the data calculation amount and cost are greatly saved, if 3 frequency bands are used, 8 second-order filters are needed, and if 4 frequency bands are used, 12 second-order filters are needed.
As can be seen from the above description, the multi-stage dynamic range control circuit according to the embodiment of the present invention can implement multi-stage dynamic range control on the audio input data Din by using a small number of filters, and can ensure that the finally superimposed target data does not have a listening sensation of phase disorder.
Based on the foregoing embodiment, another embodiment of the present invention further provides an audio processing chip, where the audio processing chip includes: the multi-segment dynamic range control circuit of the above embodiments.
The audio processing chip provided by the embodiment of the invention is provided with the multi-section dynamic range control circuit, can realize multi-section dynamic range control on audio input data, can not adjust the signal amplitude by the amplitude-frequency response of each section of filter, and can ensure that finally superposed target data has no hearing sense of phase disorder.
Based on the foregoing embodiment, another embodiment of the present invention further provides an audio processing method of an audio processing chip, where the audio processing method is shown in fig. 7, and fig. 7 is a schematic flow chart of a frequency processing method according to an embodiment of the present invention, where the method includes:
step S11: the method comprises the steps that the same audio input data are divided into N different frequency bands through N parallel dynamic range control branches, and each dynamic range control branch independently regulates and controls one frequency band to output corresponding output data.
Step S12: and outputting target data regulated and controlled by multiple sections of dynamic ranges based on the output data of each dynamic range control branch.
Wherein, the outputting the target data regulated and controlled by the multiple sections of dynamic ranges based on the output data of each dynamic range control branch comprises: and calculating the sum of the output data of all the dynamic range control branches, and taking the sum as the target data.
The audio processing method according to the embodiment of the present invention may be described with reference to the above embodiments, and is not described herein again. The audio processing method can realize multi-section dynamic range control of audio input data, the signal amplitude cannot be adjusted by the amplitude-frequency response of each section of filter, and finally overlapped target data can be ensured not to have the hearing sense of phase disorder.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the audio processing chip and the method disclosed by the embodiment, since the audio processing chip and the method correspond to the multi-segment dynamic range control circuit disclosed by the embodiment, the description is relatively simple, and the relevant points can be referred to the partial description of the multi-segment dynamic range control circuit.
It should be noted that in the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
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 (11)
1. A multi-segment dynamic range control circuit, comprising:
the device comprises N parallel dynamic range control branches, a frequency control unit and a frequency control unit, wherein the N parallel dynamic range control branches are used for dividing the same audio input data into N different frequency bands and respectively regulating and controlling the N different frequency bands, and each dynamic range control branch corresponds to one different frequency band and is used for regulating and controlling the corresponding frequency band so as to output corresponding output data; n is a positive integer greater than 1;
the output module is used for outputting target data regulated and controlled by multiple sections of dynamic ranges based on the output data of each dynamic range control branch;
wherein the phase difference of the output data of each dynamic range control branch is 0.
2. The multi-segment dynamic range control circuit of claim 1, wherein the output module is configured to calculate a sum of the output data of all the dynamic range control branches, and to use the sum as the target data.
3. The multi-segment dynamic range control circuit of claim 2, wherein the output module is an adder.
4. The multiple-segment dynamic range control circuit of claim 1, wherein the N dynamic range control branches are sequentially a 1 st branch to an nth branch, and the audio input data is input and sequentially output a 1 st output data corresponding to a 1 st frequency band to an nth output data corresponding to an nth frequency band.
5. The multiple-section dynamic range control circuit of claim 4, wherein N of the dynamic range control branches are based on a 1 st frequency point Fc1To the N-1 frequency point FcN-1Dividing the audio input data into N different frequency bands, namely a 1 st frequency point Fc1To the N-1 frequency point FcN-1And increases in turn.
6. The multi-segment dynamic range control circuit of claim 4 wherein the 1 st branch comprises a 1 st low pass filter and a 1 st dynamic range control module in series;
the ith branch comprises an ith-1 high-pass filter, an ith low-pass filter and an ith dynamic range control module which are connected in series; i is a positive integer greater than 1 and less than N;
the Nth branch comprises an N-1 high-pass filter and an Nth dynamic range control module which are connected in series;
wherein, the cut-off frequencies from the 1 st low-pass filter to the N-1 st low-pass filter are the 1 st frequency point Fc in sequence1To the N-1 frequency point FcN-1(ii) a The cut-off frequencies from the 1 st high-pass filter to the N-1 st high-pass filter are sequentially the 1 st frequency point Fc1To the N-1 frequency point FcN-1(ii) a The 1 st dynamic range control module to the Nth dynamic range control module sequentially output the 1 st output data to the Nth output data.
7. The multi-segment dynamic range control circuit of claim 6, wherein the jth low pass filter comprises: two second order low-pass Butterworth filters in series;
the jth high-pass filter includes: two second order high pass butterworth filters in series;
wherein the phase difference between the second order low-pass Butterworth filter and the second order high-pass Butterworth filter is 180 DEG, and j is a positive integer smaller than N.
8. The multi-segment dynamic range control circuit of any of claims 4-7, wherein N-5.
9. An audio processing chip, comprising:
the multi-segment dynamic range control circuit of any of claims 1-8.
10. An audio processing method of an audio processing chip, comprising:
dividing the same audio input data into N different frequency bands and respectively regulating and controlling the N different frequency bands through N parallel dynamic range control branches, wherein each dynamic range control branch corresponds to one different frequency band and is used for regulating and controlling the corresponding frequency band so as to output corresponding output data; n is a positive integer greater than 1;
outputting target data regulated and controlled by multiple sections of dynamic ranges based on the output data of each dynamic range control branch;
wherein the phase difference of the output data of each dynamic range control branch is 0.
11. The audio processing method according to claim 10, wherein outputting the target data subjected to multi-segment dynamic range control based on the output data of each of the dynamic range control branches comprises:
and calculating the sum of the output data of all the dynamic range control branches, and taking the sum as the target data.
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