CN113747304B - Novel bass playback method and device - Google Patents
Novel bass playback method and device Download PDFInfo
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- CN113747304B CN113747304B CN202110983300.6A CN202110983300A CN113747304B CN 113747304 B CN113747304 B CN 113747304B CN 202110983300 A CN202110983300 A CN 202110983300A CN 113747304 B CN113747304 B CN 113747304B
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- 230000005236 sound signal Effects 0.000 claims abstract description 10
- 238000012952 Resampling Methods 0.000 claims description 12
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- IJJWOSAXNHWBPR-HUBLWGQQSA-N 5-[(3as,4s,6ar)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-n-(6-hydrazinyl-6-oxohexyl)pentanamide Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)NCCCCCC(=O)NN)SC[C@@H]21 IJJWOSAXNHWBPR-HUBLWGQQSA-N 0.000 claims 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a novel bass playback method, which comprises the following steps: s1, sampling an input audio signal to a first target sampling rate M; s2, calculating by adopting a filter bank, determining the width of a second target sub-band, the number of N second target sub-bands and calculating to obtain a second target sampling rate M'; s3, sampling the first target sampling rate M to a second target sampling rate M 'according to the second target sampling rate M' obtained in the S2; s4, dividing the frequency of the second target sampling rate M' through a filter bank; s5, grouping N second target sub-bands according to the barker scale to obtain a plurality of second target sub-band groups; s6, forming a plurality of corresponding third target signals; and S7, playing back a plurality of third target signals through different loudspeaker units. The invention provides a novel bass playback method, which solves the problem of poor playback fidelity of bass sounds. The invention also provides a novel bass playback device.
Description
Technical Field
The invention relates to the technical field of bass playback, in particular to a novel bass playback method and device.
Background
With the development of technology, people's demands for music playback experience become higher and higher, and bass sounds become more popular. Currently, each big sound producer is pushing out N.1 combined sound with different grades, such as 2.1 sound for a desktop, 5.1 sound for a home theater, 7.1 sound and the like. Among these sounds, numbers before a decimal point, for example, 2 in 2.1 and 5 in 5.1, indicate the number of mid-high pitch sounds, while numbers after a decimal point, for example, 2.1 sounds indicate that there are 2 mid-high pitch sounds (one is a left channel and one is a right channel) and 1 sub-low pitch sound, and frequency division of the mid-high pitch and the sub-low pitch and playback by different sounds are a method capable of effectively improving playback fidelity, and particularly, playback of the sub-sounds by using one sound alone.
At present, a frequency division module is added on a signal amplification module of a sound device, input audio is divided according to fixed frequency points, high, medium and low frequencies are obtained, and the high, medium and low frequencies are respectively transmitted to different sound devices for playback. The frequency point of low-frequency division is generally selected to be 150-250 Hz, so that although the overall playback fidelity can be improved remarkably, according to the barker scale theory in the audio digital signal processing field, at least one barker band exists in the range of 150-250 Hz, that is, at least two barker bands exist in the range of 0-250 Hz, which means that when people listen to bass sounds with the frequency division point of 150-250 Hz, at least two sound signals (at least 2 barker bands exist from 0-250 Hz) need to be perceived obviously. The lower the frequency of the sound signal, the larger the interference of the intermodulation of the sound signal to the loudspeaker, which finally leads to the frequency response of the loudspeaker with serious distortion or serious unbalance. Therefore, with the n.1 sound of each large manufacturer, although the sound fidelity of the middle and high frequency ranges is good enough, the fidelity of the low frequency or even the ultra-low frequency is poor.
Disclosure of Invention
The invention aims to provide a novel bass playback method and device, which solve the problem of poor playback fidelity of bass sounds.
The invention discloses a novel bass playback method and a novel bass playback device, which adopt the following technical scheme:
A novel bass playback method comprising the steps of:
s1, sampling an input audio signal to a first target sampling rate M, wherein the first target sampling rate is twice of the highest audio point and the lowest audio point of the input audio;
S2, calculating by adopting a filter bank, determining a second target sub-band width, N second target sub-band numbers and calculating to obtain a second target sampling rate M' according to the first target sampling rate M sampled by the S1;
S3, sampling the first target sampling rate M to a second target sampling rate M 'according to the second target sampling rate M' obtained in the S2;
S4, dividing the second target sampling rate M' into N second target sub-bands through a filter bank, and determining the width of the second target sub-bands;
S5, grouping N second target sub-bands according to the barker scale to obtain a plurality of second target sub-band groups;
S6, reconstructing and synthesizing the plurality of second target subband groups obtained in the S5 and the corresponding barker bands through an inverse filter bank to form a plurality of corresponding third target signals;
and S7, playing back a plurality of third target signals through different loudspeaker units.
Preferably, the step S2 includes the following sub-steps:
S2-1, dividing the resampled first target sampling rate M into N second target sub-bands with equal widths by using a filter bank, wherein the value of the second target sub-bands needs to see the highest bass frequency point and the barker scale, so that the frequency width of the second target sub-bands can correspond to the width of 0.5 to 1 barker frequency band;
s2-2, wherein N is calculated by using the highest bass frequency point of the input audio and the frequency width of the second target sub-band, and the calculation formula of N is as follows: n=m/2/frequency width;
s2-3, where the second target sampling rate is M 'and the formula is M' =the frequency bandwidth of the second target subband is n×2, where 2 in the formula is the highest frequency of the nyquist sampling theorem signal is half the sampling rate, and therefore multiplication by 2 is required in the formula.
Preferably, the filter banks in S2 and S4 each use a perfectly reconstructed filter bank.
As a preferred scheme, the value range of N is determined to be N equal to or greater than 2 according to the theory of the perfectly reconstructed filter bank, and is the power of 2, and according to the value obtained in S3, whether N meets the requirement is judged, if yes, the subsequent steps are continued, if not, the power value of 2 which is greater than N and is close to N is selected again on the basis of the value obtained in S3, and N is determined again.
Preferably, a perfectly reconstructed inverse filter bank is used in step S6.
The utility model provides a novel bass playback device, includes a plurality of speaker unit, linear audio input terminal, ADC module, resampling module and treater, speaker unit passes through DAC module and treater module electric connection, linear audio input terminal and ADC module electric connection, ADC module and resampling module electric connection, resampling module and treater electric connection, the treater is including the calculation module that is used for implementing filter bank subband quantity calculation, the filter bank module that can perfectly reconstruct, subband grouping module and the reverse filter bank module that can perfectly reconstruct.
The novel bass playback method disclosed by the invention has the beneficial effects that: the input audio signal is sampled to a first target sampling rate, then a proper second target sampling rate is obtained through adjustment and calculation according to the first target sampling rate, then the second target sampling rate is divided by a filter bank, the second target sampling rate is combined with a bark scale and an inverse filter bank to be reconstructed and synthesized, a plurality of third target signals are formed, and the third target signals are played back through different speakers, so that the bass sound playback has better fidelity.
Drawings
Fig. 1 is a flow chart of a novel bass playback method of the present invention.
Fig. 2 is a table of frequency ranges for the existing barker band.
Fig. 3 is a schematic diagram of a novel bass playback apparatus of the present invention.
Detailed Description
The invention is further illustrated and described below in conjunction with the specific embodiments and the accompanying drawings:
referring to fig. 1, a novel bass playback method includes the following steps:
S1, an input audio signal is sampled to a first target sampling rate M, wherein the first target sampling rate is twice of the highest audio point and the lowest audio point of the input audio.
S2, calculating by adopting a filter bank, determining a second target sub-band width, N second target sub-band numbers and calculating to obtain a second target sampling rate M' according to the first target sampling rate M sampled by the S1.
In step S2 the following sub-steps are included:
S2-1, dividing the resampled first target sampling rate M into N second target sub-bands with equal widths by using a filter bank, wherein the value of the second target sub-bands needs to see the highest bass frequency point and the barker scale, and the frequency width of the second target sub-bands can be ensured to correspond to the width of 0.5 to 1 barker frequency band.
S2-2, wherein N is calculated by using the highest bass frequency point of the input audio and the frequency width of the second target sub-band, and the calculation formula of N is as follows: n=m/2/frequency width.
S2-3, where the second target sampling rate is M 'and the formula is M' =the frequency bandwidth of the second target subband is n×2, where 2 in the formula is the highest frequency of the nyquist sampling theorem signal is half the sampling rate, and therefore multiplication by 2 is required in the formula.
S3, sampling the first target sampling rate M to a second target sampling rate M 'according to the second target sampling rate M' obtained in the S2.
S4, dividing the second target sampling rate M' into N second target sub-bands through a filter bank, and determining the width of the second target sub-bands.
S5, grouping the N second target sub-bands according to the barker scale to obtain a plurality of second target sub-band groups.
S6, reconstructing and synthesizing the second target subband groups obtained in the S5 and the barker bands corresponding to the second target subband groups through an inverse filter bank to form a plurality of third target signals.
And S7, playing back a plurality of third target signals through different loudspeaker units.
In the above solution, the filter banks in S2 and S4 are all perfectly reconstructed filter banks, which are in the prior art, and therefore are not improved in the present technical solution, and therefore are not described herein, and the perfectly reconfigurable filter banks used are not limited, and PQF (Polyphase quadrature filter), QMF (Quadrature Mirror Filters), MDCT or other polyphase filters may be selected according to practical situations in practical implementation. The present implementation example uses a perfectly reconfigurable PQF (Polyphase quadrature filter) filter bank for subband splitting and a perfectly reconfigurable IPQF (Inverse Polyphase quadrature filter) inverse filter bank for subband signal synthesis.
And the value range of N is determined to be N which is more than or equal to 2 according to the theory of the perfectly reconstructed filter bank and is the power of 2, whether N meets the requirement is judged according to the numerical value obtained in the step S3, if the N meets the requirement, the subsequent steps are continued, if the N does not meet the requirement, the power of 2 which is more than N and is close to N is selected again on the basis of the numerical value obtained in the step S3, and the N is determined again.
And in the step S6, a perfect reconstruction inverse filter bank is adopted, and the perfect reconstruction inverse filter bank is matched with the perfect reconstruction filter banks adopted in the step S2 and the step S4.
If the sampling rate of the input signal is 48000Hz, the bass frequency of the audio configuration is 250Hz, and the first target sampling rate is to resample the input 48000Hz signal to 500Hz to reject the medium-high frequency signal, and only the bass signal is remained.
Then, the resampled signal is divided into N second target sub-bands with equal widths by using a perfectly reconfigurable filter bank, N is greater than or equal to 2 and is a power of 2, the specific value of N needs to see the highest bass frequency point and the barker scale, to ensure that the frequency width of the sub-bands can correspond to the width of 1 or half barker band, please refer to fig. 2, in the frequency interval less than or equal to 500Hz, the width of each barker frequency band is 100Hz, and therefore, the bandwidth of the sub-band should be 50Hz or 100Hz.
If the highest bass frequency point is 250Hz in this embodiment, if N is 3 according to 100Hz of each subband, the frequency range of subband 1 is 0-100 Hz, the frequency range of subband 2 is 100-200 Hz, the frequency range of subband 3 is 200-300 Hz, if N is 5 according to 50Hz of each subband, the frequency range of subband 1 is 0-50 Hz, the frequency range of subband 2 is 50-100 Hz, the frequency range of subband 3 is 100-150 Hz, the frequency range of subband 4 is 150-200 Hz, the frequency range of subband 5 is 200-250 Hz, and it is obvious that selecting 50Hz to be the width of each subband can be closer to the highest bass frequency point. And in practice, the 50Hz width is chosen unless the 100Hz width is chosen preferentially based on reduced system resource consumption or load considerations.
The highest bass frequency point and subband width are used to calculate N, n=250 Hz/50 hz=5, however n=5 is not allowed, and does not meet the above requirement for N, so only the 500Hz signal can be resampled up again, while the second target sampling rate M ' is calculated by M ' =50×n×2, where 50 is the selected frequency subband width 50Hz,2 is the highest frequency of the signal according to the nyquist sampling theorem being half the sampling rate, so the frequency-to-sampling rate needs to be multiplied by 2, N can only be equal to or greater than 5, and n=5, 6, 7 is not a power of 2, so N is selected to be 8,8 is a power of 2, i.e. M ' =50×8×2=800 Hz, so the resampled 500Hz signal needs to be resampled up to 800Hz here.
The optimization of the first step of resampling 500Hz directly to 800Hz cannot be considered, since the purpose of the first step of resampling is to filter out signals above 250Hz mainly without affecting the phase.
A perfect reconstruction filter bank with N=8 is constructed to divide the frequency of the signal with the sampling rate of 800Hz to obtain a total of 8 second target sub-bands, wherein the first frequency is 0-50 Hz, the second frequency is 50-100 Hz, the third frequency is 100-150 Hz, the fourth frequency is 150-200 Hz, the fifth frequency is 200-250 Hz, the sixth frequency is 250-300 Hz, the seventh frequency is 300-350 Hz, and the eighth frequency is 350-400 Hz.
Then, according to the barker scale, the frequency sub-bands divided above are grouped in units of barker bands starting from 0Hz to 250Hz with 250Hz being the highest bass frequency point, i.e., barker band 1 is a frequency corresponding to the second target sub-band 1 and the second target sub-band 2 from 0 to 100Hz, barker band 2 is a frequency corresponding to the second target sub-band 3 and the second target sub-band 4 from 100 to 200Hz, and barker band 3 is a frequency corresponding to the second target sub-band 5 and the second target sub-band 6 from 200Hz to 300 Hz.
Finally, the above sub-bands are sequentially reconstructed by using the inverse filter bank of the first and second reconstruction, that is, the sub-band group 1 is reconstructed into a signal a by the barker band 1, the second target sub-band 1 and the second target sub-band 2, the sub-band group 2 is reconstructed into a signal B by the barker band 2, the second target sub-band 3 and the second target sub-band 4, and the sub-band group 3 is reconstructed into a signal C by the barker band 3, the second target sub-band 5 and the second target sub-band 6. The resulting signals A, B and C were each played back using 3 different speakers.
The utility model provides a novel bass playback device, includes a plurality of speaker unit, linear audio input terminal, ADC module, resampling module and treater, speaker unit passes through DAC module and treater module electric connection, linear audio input terminal and ADC module electric connection, ADC module and resampling module electric connection, resampling module and treater electric connection, the treater is including the calculation module that is used for implementing filter bank subband quantity calculation, the filter bank module that can perfectly reconstruct, subband grouping module and the reverse filter bank module that can perfectly reconstruct.
Referring to fig. 3, a linear audio input terminal is configured to receive an input audio signal, an ADC module is configured to convert an analog signal of the linear audio input signal into a digital signal, and a resampling module is configured to resample the digital signal converted by the ADC to a first target sampling rate. And calculating the number of second target subbands and a second target sampling rate by a calculation module in the processor, dividing the second target subbands by a filter bank module to obtain second target subband signals, grouping the second target subband signals by a subband grouping module to obtain second target subband groups according to the barker scale, and reconstructing the second target subband groups by an inverse filter bank module to obtain third target signals. And playback from different speaker units will take place through the DNC module and the power amplifier circuit.
The invention provides a novel bass playback method, which is characterized in that an input audio signal is sampled to a first target sampling rate, then a proper second target sampling rate is obtained by adjusting and calculating according to the first target sampling rate, then the second target sampling rate is divided by a filter bank, a plurality of third target signals are formed by reconstruction and synthesis through a Baker scale and an inverse filter bank, and then the plurality of third target signals are played back through different speakers, so that the bass sound playback has better fidelity.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. A novel bass playback method, comprising the steps of:
s1, sampling an input audio signal to a first target sampling rate M, wherein the first target sampling rate is twice of the highest audio point and the lowest audio point of the input audio;
s2, calculating by adopting a filter bank, determining a second target sub-band width, N second target sub-band numbers and calculating to obtain a second target sampling rate M' according to the first target sampling rate M sampled by the S1, wherein the value range of N is determined to be N more than or equal to 2 and is the power of 2 according to the theory of the perfectly reconstructed filter bank;
in step S2 the following sub-steps are included:
S2-1, dividing the resampled first target sampling rate M into N second target sub-bands with equal widths by using a filter bank, wherein the value of the second target sub-bands needs to see the highest bass frequency point and the barker scale, so that the frequency width of the second target sub-bands can correspond to the width of 0.5 to 1 barker frequency band;
s2-2, wherein N is calculated by using the highest bass frequency point of the input audio and the frequency width of the second target sub-band, and the calculation formula of N is as follows: n=m/2/frequency width;
S2-3, wherein the second target sampling rate is M 'and the calculation formula is M' =the frequency bandwidth of the second target subband is n×2, where 2 in the calculation formula is the highest frequency of the nyquist sampling theorem signal is one half of the sampling rate, and therefore, multiplication by 2 is required in the calculation formula;
S3, sampling the first target sampling rate M to a second target sampling rate M 'according to the second target sampling rate M' obtained in the S2;
S4, dividing the second target sampling rate M' into N second target sub-bands through a filter bank, and determining the width of the second target sub-bands;
S5, grouping N second target sub-bands according to the barker scale to obtain a plurality of second target sub-band groups;
s6, reconstructing and synthesizing the second target subband groups obtained in the S5 and the Bach frequency bands corresponding to the second target subband groups through an inverse filter bank to form a plurality of third target signals;
and S7, playing back a plurality of third target signals through different loudspeaker units.
2. A novel bass playback method as claimed in claim 1, characterized in that the filter banks in S2 and S4 each employ a perfectly reconstructed filter bank.
3. The method of claim 1, wherein whether N meets the requirement is determined according to the value obtained in S3, if yes, the following steps are continued, and if not, the power value of 2 greater than N and close to N is selected again based on the value obtained in S3, and N is determined again.
4. A novel bass playback method as claimed in claim 1, characterized in that in step S6 a perfectly reconstructed inverse filter bank is used.
5. The novel bass playback device is characterized by comprising a plurality of speaker units, linear audio input terminals, an ADC module, a resampling module and a processor, wherein the speaker units are electrically connected with the processor module through the DAC module, the linear audio input terminals are electrically connected with the ADC module, the ADC module is electrically connected with the resampling module, the resampling module is electrically connected with the processor, and the processor comprises a calculation module for calculating the number of sub-bands of a filter bank, a perfectly reconfigurable filter bank module, a sub-band grouping module and a perfectly reconfigurable inverse filter bank module.
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