CN202178861U - Virtual bass boosting treatment device based on harmonic control - Google Patents
Virtual bass boosting treatment device based on harmonic control Download PDFInfo
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- CN202178861U CN202178861U CN2011202805539U CN201120280553U CN202178861U CN 202178861 U CN202178861 U CN 202178861U CN 2011202805539 U CN2011202805539 U CN 2011202805539U CN 201120280553 U CN201120280553 U CN 201120280553U CN 202178861 U CN202178861 U CN 202178861U
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Abstract
The utility model discloses a virtual bass boosting treatment device based on harmonic control, which comprises a high-pass filter module, a delay module, a low-pass filter module and a bass processing module, wherein an output end of the high-pass filter module is connected with an input end of the delay module; an output end of the low-pass filter module is connected with an input end of the bass processing module; an input end of the high-pass filter module is connected with a voice frequency signal end after connecting with an input end of the low-pass filter module in parallel; and an output end of the delay module is connected with a speaker after connecting with an output end of the bass processing module in parallel. The virtual bass boosting treatment device based on harmonic control can exactly reduce bass loudness of voice frequency so that loudness and sound sensations of the processed voice frequency and original voice frequency become closer; and the virtual bass boosting treatment method becomes simple.
Description
Technical field
The utility model relates to the audio signal processing technique field, is specifically related to a kind of virtual bass enhancement process device based on harmonic wave control.
Background technology
At present, most of loud speakers still adopt traditional moving-coil structure.Owing to be limited by its volume, the non-constant of low frequency play capability of miniature loudspeaker.Yet the low-frequency component of audio frequency plays important effect in sense of hearing perception, directly affects the subjective assessment index such as dynamics, richness, soften of audio frequency.Low frequency play capability how to improve miniature loudspeaker is the problem that presses for solution always.The method that traditional use equalizer improves the low frequency power output not only makes audio signal produce severe distortion, and very big to the infringement of loud speaker.
Summary of the invention
For solving the shortcoming and defect that prior art exists, the utility model provides a kind of virtual bass enhancement process device based on harmonic wave control, and its tone color and loudness are all more near former audio signal.
The purpose of the utility model realizes through following technical proposals:
A kind of virtual bass enhancement process device based on harmonic wave control; Comprise high-pass filtering module, time delay module, low-pass filtering module, bass processing module; The output of said high-pass filtering module is connected with the input of time delay module; The output of said low-pass filtering module is connected with the input of bass processing module; The input of said high-pass filtering module with connect the audio signal end after the input of low-pass filtering module is parallelly connected, the output of said time delay module with connect loud speaker after the output of bass processing module is parallelly connected.
Said bass processing module comprises fast Fourier transform module, first harmonic generation and peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module, the first loudness control module, the second loudness control module, the 3rd loudness control module, sinusoidal laminating module;
Said first harmonic generates and the input back parallel with one another of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the output of fast Fourier transform module;
Said first harmonic generates and the output of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the input of the first loudness control module, the second loudness control module, the 3rd loudness control module respectively;
The output of the said first loudness control module, the second loudness control module, the 3rd loudness control module is connected with sinusoidal laminating module.
The utility model operation principle is, same path signal is divided into two-way, and wherein a path signal obtains the composition that signal is higher than the loud speaker cut-off frequency after handling through the high-pass filtering processing module, after time delay module is handled, directly obtains high-frequency signal; Obtain after low-pass filtering module, the bass processing module of another path signal through 1000Hz handled virtual low frequency signal and with above-mentioned high-frequency signal stack, export at last and through speaker playback sound.
Compared with prior art the beneficial effect of the utility model is:
The utility model adopts harmonic wave to generate and the peak value matching module, and the generation amplitude is with three harmonic waves of 0.5 exponential damping.Choose 0.5 for the harmonic wave proportionality coefficient be because subjective tonequality evaluation experimental result show with the truth of a matter be 0.5 exponential damping the reduction of harmonic wave tone color better.
Adopt the loudness control module to handle and control the harmonic wave complex tone loudness of fixed amplitude ratio.According to the amplitude of low frequency fundamental tone, calculate the amplitude proportional (w) of low frequency fundamental tone subharmonic minimum under different frequency and the different sound pressure levels with it, thus loudness such as realization.Improve the accuracy of loudness control.As shown in the table:
Loudness harmonic wave and fundamental frequency amplitude proportional such as table 1
| SPL/dB | 50 | 60 | 70 | 80 |
| 100Hz | 0.30 | 0.30 | 0.38 | 0.52 |
| 125Hz | 0.34 | 0.36 | 0.38 | 0.53 |
| 150Hz | 0.39 | 0.43 | 0.43 | 0.54 |
The utility model technological means is simple and easy to do, can reduce the low sonority of audio frequency accurately, makes on loudness and the tone sense of audio frequency and former audio frequency after handling more approaching.
Description of drawings
Fig. 1 is the virtual bass enhancement process equipments overall structure sketch map of the utility model based on harmonic wave control;
Fig. 2 is Fig. 1 bass processing module structural representation.
Fig. 3 is that the harmonic wave of a certain Frequency point of the utility model generates sketch map.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is done further to describe in detail, but the execution mode of the utility model is not limited thereto.
Embodiment
Like Fig. 1, shown in Figure 2; The utility model is based on the virtual bass enhancement process device of harmonic wave control; Comprise high-pass filtering module, time delay module, low-pass filtering module, bass processing module; The output of said high-pass filtering module is connected with the input of time delay module; The output of said low-pass filtering module is connected with the input of bass processing module, the input of said high-pass filtering module with connect the audio signal end after the input of low-pass filtering module is parallelly connected, the output of said time delay module with connect loud speaker after the output of bass processing module is parallelly connected.
Said bass processing module comprises fast Fourier transform module, first harmonic generation and peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module, the first loudness control module, the second loudness control module, the 3rd loudness control module, sinusoidal laminating module;
Said first harmonic generates and the input back parallel with one another of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the output of fast Fourier transform module;
Said first harmonic generates and the output of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the input of the first loudness control module, the second loudness control module, the 3rd loudness control module respectively;
The output of the said first loudness control module, the second loudness control module, the 3rd loudness control module is connected with sinusoidal laminating module.
Same path signal is divided into two-way, and wherein a path signal obtains the composition that signal is higher than the loud speaker cut-off frequency after handling through the high-pass filtering processing module, after time delay module is handled, directly obtains high-frequency signal; Obtain after low-pass filtering module, the bass processing module of another path signal through 1000Hz handled virtual low frequency signal and with above-mentioned high-frequency signal stack, output at last also restores sound through loud speaker.Select the 1000Hz low-pass filtering treatment to be because the peak value matching process in the bass processing procedure will obtain the frequency spectrum of original signal [Fc-4*Fc] scope earlier.
Like Fig. 2, shown in Figure 3.Bass processing module processing procedure is following:
(1) signal of handling through low-pass filtering module falls sampling processing through 16 times and falls sampling; Again through fast Fourier transform module (FFT; Count and be N=1024; Pin moves and is N/2) handle after, obtain the 2-d spectrum information of this signal about time and frequency, from the spectrum information of two dimension, obtain respectively: amplitude and the phase information of frequency Fc/2 to the amplitude of Fc and phase information, frequency Fc/3 to Fc/2, frequency 40Hz are to amplitude and the phase information of Fc/3; Because low-pass signal only comprises the signal below the 1000Hz, can fall sample reduction and calculate.The original signal sample rate is 44100, falls sampling post-sampling rate through 16 times and is about 2756.Low-pass signal highest frequency 1000Hz still satisfies sampling thheorem less than 2756/2.
Must be higher than loud speaker cut-off frequency Fc because generate the frequency of harmonic wave, frequency Fc/2 generates 2,3,4 subharmonic to the signal of Fc; Frequency Fc/3 generates 3,4,5 subharmonic to the signal of Fc/2; Frequency 40Hz generates 4,5,6 subharmonic to the signal of Fc/3; Because people's ear thinks that all pitch is consistent in ± 5% the scope approximately at certain Frequency point place, thus each harmonic frequency ± 5% scope in search peak, and adopt the frequency at this peak value place to replace harmonic frequency, carry out peak value and mate.
(2) after frequency Fc/2 handles through first harmonic generation, peak value matching module to the signal of Fc, handle by the first loudness control module again; Frequency Fc/3 is handled by the second loudness control module after handling through second harmonic generation, peak value matching module to the signal of Fc/2 again; Frequency 40Hz is handled by the 3rd loudness control module after handling through third harmonic generation, peak value matching module to the signal of Fc/3 again;
Signal after handling through first, second, third loudness control module is handled through sinusoidal laminating module, obtains time-domain signal, handles through 16 times of up-samplings, makes the signals sampling rate become 44100 and pass through speaker playback again.
Said frequencies Fc/2 generates 2,3,4 subharmonic to the signal of Fc, and the amplitude of these three harmonic waves is respectively X
n, X
N+1, X
N+2X wherein
n=w1*X
0, X
N+1=a*X
n, X
N+2=a*X
N+1A is the harmonic wave proportionality constant; W1 such as is at the loudness control coefrficient; X
0Be the low frequency signal amplitude.
Said frequencies Fc/3 generates 3,4,5 subharmonic to the signal of Fc/2, and the amplitude of these three harmonic waves is respectively X
n, X
N+1, X
N+2X wherein
n=w2*X
0, X
N+1=a*X
n, X
N+2=a*X
N+1W2 such as is at the loudness control coefrficient.
Said frequencies 40Hz generates 4,5,6 subharmonic to the signal of Fc/3, and the amplitude of these three harmonic waves is respectively X
n, X
N+1, X
N+2X wherein
n=w3*X
0, X
N+1=a*X
n, X
N+2=a*X
N+1W3 such as is at the loudness control coefrficient.
Just can realize the utility model preferably as stated.
Claims (2)
1. virtual bass enhancement process device based on harmonic wave control; It is characterized in that: comprise high-pass filtering module, time delay module, low-pass filtering module, bass processing module; The output of said high-pass filtering module is connected with the input of time delay module; The output of said low-pass filtering module is connected with the input of bass processing module; The input of said high-pass filtering module with connect the audio signal end after the input of low-pass filtering module is parallelly connected, the output of said time delay module with connect loud speaker after the output of bass processing module is parallelly connected.
2. the virtual bass enhancement process device based on harmonic wave control according to claim 1 is characterized in that: said bass processing module comprises fast Fourier transform module, first harmonic generation and peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module, the first loudness control module, the second loudness control module, the 3rd loudness control module, sinusoidal laminating module;
Said first harmonic generates and the input back parallel with one another of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the output of fast Fourier transform module;
Said first harmonic generates and the output of peak value matching module, second harmonic generation and peak value matching module, third harmonic generation and peak value matching module is connected with the input of the first loudness control module, the second loudness control module, the 3rd loudness control module respectively;
The output of the said first loudness control module, the second loudness control module, the 3rd loudness control module is connected with sinusoidal laminating module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053094A (en) * | 2014-05-30 | 2014-09-17 | 歌尔声学股份有限公司 | Active band-stop filtering circuit |
| CN109697990A (en) * | 2018-11-12 | 2019-04-30 | 南京南大电子智慧型服务机器人研究院有限公司 | A kind of method for objectively evaluating based on virtual bass algorithm subjective assessment |
-
2011
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053094A (en) * | 2014-05-30 | 2014-09-17 | 歌尔声学股份有限公司 | Active band-stop filtering circuit |
| CN104053094B (en) * | 2014-05-30 | 2018-02-06 | 歌尔股份有限公司 | A kind of active rejector circuit |
| CN109697990A (en) * | 2018-11-12 | 2019-04-30 | 南京南大电子智慧型服务机器人研究院有限公司 | A kind of method for objectively evaluating based on virtual bass algorithm subjective assessment |
| CN109697990B (en) * | 2018-11-12 | 2020-12-11 | 南京南大电子智慧型服务机器人研究院有限公司 | Objective evaluation method based on virtual bass algorithm subjective evaluation |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120328 Termination date: 20140803 |
|
| EXPY | Termination of patent right or utility model |