CN104503297A - DSP audio digital signal processing system and method - Google Patents
DSP audio digital signal processing system and method Download PDFInfo
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- CN104503297A CN104503297A CN201410685104.0A CN201410685104A CN104503297A CN 104503297 A CN104503297 A CN 104503297A CN 201410685104 A CN201410685104 A CN 201410685104A CN 104503297 A CN104503297 A CN 104503297A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G—PHYSICS
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Abstract
The invention relates to the field of electro-acoustic technology, and particularly relates to a DSP audio digital signal processing system and a method. The DSP audio digital signal processing system comprises an audio analog signal input interface module, a DSP digital signal processing module, an audio analog signal output interface module, a single chip microcomputer micro control module, a display module and a user operation interface module; the display module, the user operation interface module and the DSP digital signal processing module are in signal connection with the single chip microcomputer micro control module; and the audio analog signal input interface module and the audio analog signal output interface module are in signal connection with the DSP digital signal processing module. When the system and the method of the invention are adopted, the traditional audio power amplifier prestage for pure analog signal processing can be changed into digital prestage with the DSP digital signal processing function, and high speed, high efficiency and flexibility of digital signal processing are counted.
Description
Technical field
The present invention relates to electroacoustic techniques field, particularly relate to a kind of DSP audio digital signals disposal system and method.
Background technology
Audio electrical signal is converted to actual voice signal, has been come by loudspeaker, as a kind of energy transducer, and good and bad the having the greatest impact to tonequality of its performance.In stereo set, loudspeaker is most important device, also be the weakest device simultaneously, although of a great variety, but structural principle is identical substantially, in addition due to the difference of material, cause different speaker performance difference huge, its inherent shortcoming on the frequency response cannot be made up by Renewal Design or Material selec-tion completely.Audio amplifier is the terminal device of whole sound system, and its sound-generating element is exactly loudspeaker, so the performance of loudspeaker also just determines the performance of audio amplifier to a great extent.Audio amplifier can be divided into active audio amplifier (being also active audio amplifier) and passive loudspeaker box (being also passive speaker) two class, and active audio amplifier inside carries special power amplification circuit, and use lower audio signal level Direct driver, passive loudspeaker box needs external power amplifier.The present invention is directed active audio amplifier, therefore, in all literary composition gears, the audio amplifier improved all refers to active audio amplifier more.Traditional power amplifier adopts pure mimic channel, except excessively sound signal being amplified, if want to correct the frequency response performance of audio amplifier, can only realize by increasing hardware circuit, by the impact of circuit theory and component parameters, be difficult to reach desirable effect, and a little simple adjustment can only be done, if want to realize minute adjustment, the complexity of realizing circuit will be increased greatly.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of DSP audio digital signals disposal system and method, adopt this System and method for the audio frequency power amplifier prime of traditional pure analog signal processing can be changed into the digital prime of band DSP digital signal processing function, rely on the high speed of digital signal processing, efficient and dirigibility, make up the inherent shortcoming of loudspeaker, audio amplifier and audio frequency power amplifier from software view, the performance parameter of sound system and auditory effect are significantly promoted.
The technical solution adopted in the present invention is: a kind of DSP audio digital signals disposal system and method,
Described DSP audio digital signals disposal system comprises audio analog signals input interface module, DSP digital signal processing module, audio analog signals output interface module, single-chip microcomputer micro-control module, display module and user interface module, described display module, user interface module and DSP digital signal processing module are all connected with single-chip microcomputer micro-control module signal, and described audio analog signals input interface module and audio analog signals output interface module are all connected with DSP digital signal processing module signal;
Signal after process for connecting external audio signal input, signal amplification and improving signal to noise ratio (S/N ratio), and is sent into the analog input interface of DSP digital signal processing module by described audio analog signals input interface module;
Described DSP digital signal processing module is used for carrying out A/D conversion, digital signal processing to the simulated audio signal of input, exports high pitch, bass and subwoofer simulating signal after frequency division to audio analog signals output interface module again after process terminates by D/A conversion;
Described audio analog signals output interface module divides high pitch output channel, bass output channel and subwoofer output channel, high pitch output channel and bass output channel are connected with power amplifier rear class high pitch, bass amplifying circuit respectively, and the super low sound signal that subwoofer output channel exports is directly as the signal source of super-bass loudspeaker box;
Described display module, as user interface, indicates for Display System Function, module running status, parameter and user operation;
Described user interface module integration system all operations be set to one;
Described single-chip microcomputer micro-control module is used for the running status of other modules in control system; Be integrated with program code and the parameter of DSP digital signal processing in single-chip microcomputer microcontroller program in described single-chip microcomputer micro-control module, major function comprises the loading of DSP DSP program code and parameter, the running status of each functional module of DSP digital signal processing controls and operational factor arranges renewal, LCD display and control and renewal, user operation detection and indentification, system running state and system power failure and monitors;
Described DSP digital signal processing module comprises A/D modular converter, loudspeaker frequency response curve rectification module and the D/A modular converter that signal successively connects;
Described DSP audio digital signals disposal route mainly comprises the following steps:
(1), set loudspeaker frequency response curve correct parameter and set other parameters by user interface module;
(2), external audio simulating signal input audio analog signals input interface module, then amplify through audio analog signals input interface module signal and improve after signal to noise ratio (S/N ratio) and be input to A/D modular converter, and then be transformed into audio digital signals through A/D modular converter and be input to loudspeaker frequency response curve rectification module;
(3) the loudspeaker frequency response curve rectification parameter that, loudspeaker frequency response curve rectification module sets according to step (1) processes the audio digital signals transmitted;
(4), by the audio digital signals after step (3) process be input to D/A modular converter, then transform through D/A modular converter and become audio analog signals;
(5) audio analog signals after, step (4) being transformed is exported by audio analog signals output interface module;
And the setting loudspeaker frequency response curve of described step (1) rectification parameter mainly comprises the following steps:
A, first use electroacoustical instrument, in the anechoic room of standard, record actual frequency response curve and the actual phase response curve of audio amplifier;
B, actual frequency response curve measured in steps A and the target frequency response curve formulated by loudspeaker slip-stick artist and audio amplifier slip-stick artist to be contrasted, obtain the difference on each Frequency point of audio frequency, thus draw a speaker frequency response plot correction table, described correction table comprises the number that the frequency that will insert corrects point, and the centre frequency of wave filter needed for each Frequency point, filter type, filter Q and lifting or decay range parameter;
Parameter in C, the speaker frequency response plot correction table that obtains according to step B is arranged loudspeaker frequency response curve rectification module;
D, good loudspeaker frequency response curve rectification module set by step C being downloaded to separately special speaker frequency response plot corrects in debugging board, and repeat steps A, audio amplifier after overcorrection is tested, obtain the actual audio amplifier frequency response curve recorded after overcorrection, and contrast with the target frequency response curve formulated in step B, if both also have any different, then inching is carried out to speaker frequency response plot correction table, then according to the parameter in speaker frequency response plot correction table after inching, loudspeaker frequency response curve rectification module is arranged, repeat step step D more afterwards, until both are identical,
Parameter in E, the speaker frequency response plot correction table that adjusted by step D is arranged loudspeaker frequency response curve rectification module, then is added in DSP digital signal processing module by the loudspeaker frequency response curve rectification module set.
Adopt above structure and method compared with prior art, the present invention has the following advantages: DSP Digital Signal Processing is incorporated in audio signal amplifying system by the present invention, design a set of audio frequency power amplifier backing system with DSP digital signal processing function, rely on digital signal processing capability and programmability that DSP is powerful, software view promotes the performance of audio amplifier, native system thoroughly can save Audio Signal Processing Analogical Electronics part, one piece of DSP digital signal processing chip and simple peripheral circuit is used to replace, all functions relevant with Audio Signal Processing all use software, finally be integrated in dsp chip and realized, increase functionally does not need to make any change to hardware, and meticulousr adjustment and process can be accomplished, relied on the function that pure hardware circuit can not realize in the past, can realize easily in the present system.Meanwhile, add single-chip microcomputer micro control system and Presentation Function in systems in which, integrated all operations, in the rotary encoder of a band button, makes whole system more intelligent and can display, the man-machine operating performance of significant increase.Concerning whole audio amplifier, performance is more close to idealized requirement.
Accompanying drawing explanation
Fig. 1 is the system chart of DSP audio digital signals disposal system of the present invention and method.
Fig. 2 is that DSP audio digital signals disposal system of the present invention and method system are started shooting block diagram.
Fig. 3 DSP audio digital signals of the present invention disposal system and method system setting operation process flow diagram.
Fig. 4 is the comparing result of frequency response curve before rectification and after correcting of DSP audio digital signals disposal system audio amplifier of the present invention.
Fig. 5 is the optional audio of DSP audio digital signals disposal system audio amplifier of the present invention and the frequency response curve of correspondence thereof.
The treatment effect comparison diagram that Fig. 6 carries out when installation site is different for DSP audio digital signals disposal system audio amplifier of the present invention.
Fig. 7 is the treatment effect figure of the high and low sound processing module of DSP audio digital signals disposal system audio amplifier of the present invention.
The setting of Fig. 8 effect that to be DSP audio digital signals disposal system super-bass loudspeaker box of the present invention correct frequency response curve and subwoofer cutoff frequency.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further, but the present invention is not limited only to following embodiment.
As shown in the figure: a kind of DSP audio digital signals disposal system and method,
Described DSP audio digital processing system comprises audio analog signals input interface module, DSP digital signal processing module, audio analog signals output interface module, single-chip microcomputer micro-control module, display module and user interface module, described display module, user interface module and DSP digital signal processing module are all connected with single-chip microcomputer micro-control module signal, and described audio analog signals input interface module and audio analog signals output interface module are all connected with DSP digital signal processing module signal;
Signal after process for connecting external audio signal input, signal amplification and improving signal to noise ratio (S/N ratio), and is sent into the analog input interface of DSP digital signal processing module by described audio analog signals input interface module;
Described DSP digital signal processing module is used for carrying out A/D conversion, digital signal processing to the simulated audio signal of input, exports high pitch, bass and subwoofer simulating signal after frequency division to audio analog signals output interface module again after process terminates by D/A conversion;
Described audio analog signals output interface module divides high pitch output channel, bass output channel and subwoofer output channel, high pitch output channel and bass output channel are connected with the high and low amplifying circuit of power amplifier rear class respectively, and the super low sound signal that subwoofer output channel exports is directly as the signal source of super-bass loudspeaker box;
Described display module, as user interface, indicates for Display System Function, module running status, parameter and user operation; Described display module is LCD display;
Described user interface module integration system all operations be set to one; Described user interface module is the rotary encoder of a band keypress function;
Described single-chip microcomputer micro-control module is used for the running status of other modules in control system;
Described DSP digital signal processing module comprises A/D modular converter, loudspeaker frequency response curve rectification module and the D/A modular converter that signal successively connects; Described DSP digital signal processing module also comprises input signal pressure limit control module, system master volume controls and the quiet control module of system, noise processed module, audio treble processing module, audio bass processing module, loudspeaker loudness control module, audio arrange module, system delay module, audio amplifier maximum power control module, audio frequency height cent frequency module and subwoofer and arrange module.
Described DSP audio digital signals disposal route mainly comprises the following steps:
(1), set loudspeaker frequency response curve correct parameter and set other parameters by user interface module;
(2), external audio simulating signal input audio analog signals input interface module, then amplify through audio analog signals input interface module signal and improve after signal to noise ratio (S/N ratio) and be input to A/D modular converter, and then be transformed into audio digital signals through A/D modular converter and be input to loudspeaker frequency response curve rectification module;
(3) the loudspeaker frequency response curve rectification parameter that, loudspeaker frequency response curve rectification module sets according to step (1) processes the audio digital signals transmitted;
(4), by the audio digital signals after step (3) process be input to D/A modular converter, then transform through D/A modular converter and become audio analog signals;
(5) audio analog signals after, step (4) being transformed is exported by audio analog signals output interface module.
And also needed to limit the peak-peak of input audio signal before step (3): when exceeding threshold values when the peak-peak of input audio signal, according to signal peak compaction table, sound signal is compressed, and carry out showing to point out user should reduce input signal volume in LCD display according to the degree of compression; For the signal not exceeding threshold values, then do not carry out any process.
And then carrying out the control of system master volume and the quiet control of system: system sound volume is divided into 91 grades :-80dB ~+10dB, and is regulate step-length with 1dB, arranged by user, when volume is less than-79dB, system automatically switches to silent mode.
After step (3), also need to carry out audio treble process: use high shoulder wave filter or pinnacle wave filter promote high pitch or decay, range of adjustment is :-10dB ~+10dB, and regulates using 1dB as step-length.
Audio bass process: use low shoulder wave filter or pinnacle wave filter promote bass or decay, range of adjustment is :-10dB ~+10dB, and regulates using 1dB as step-length.
Loudspeaker loudness controls: when audio amplifier output sound pressure level is lower, for balancing the loudness of high, medium and low sound, the equal loudness contour figure of establishing criteria, promotes with the treble portion being greater than 7000Hz the bass part being less than 60Hz.
Audio is arranged: use 10 sections of equalization filters, promote each frequency band of sound or decay, simulate the auditory effect of audio amplifier under different application occasion.
System delay: under multitone case applied environment, for the synchronous sound making multiple audio amplifier export arrives a certain auditory sensation area, according to the aerial velocity of propagation of sound, export again after time delay is carried out by distance to the audio amplifier of different putting position, and delay duration is arranged for user with the form of distance (unit is m (rice) or ft (foot)).
Audio amplifier maximum power control: according to the requirement of audio amplifier peak power output, signal transient peak level audio analog signals output interface being exported to audio frequency power amplifier rear class limits, guarantee that power amplifier is operated within the scope of firm power, avoid burning out power amplifier or loudspeaker because power is excessive, compression compression is carried out in proportion to the level exceeding prescribed threshold, the signal level after compression=original signal level * (threshold level/former quotation marks level).The signal not exceeding threshold values is left intact.
Audio frequency height cent frequency: removed high and low two frequency divisions and export, also can carry out high, medium and low three frequency division divisor, the parameter such as filter type, part-frequency point frequency, end gain, output polarity of each frequency range frequency divider is all optional, specific requirement is determined by slip-stick artist, but for user, be sightless.
Subwoofer is arranged: frequently, the parameter such as filter type, cutoff frequency, end gain, output polarity of subwoofer frequency divider is optional, and specific requirement is determined by slip-stick artist, but for user, is sightless for process similar audio frequency height cent.
And the setting loudspeaker frequency response curve of described step (1) rectification parameter mainly comprises the following steps:
A, first use electroacoustical instrument, in the anechoic room of standard, record actual frequency response curve and the actual phase response curve of audio amplifier;
B, actual frequency response curve measured in steps A and the target frequency response curve formulated by loudspeaker slip-stick artist and audio amplifier slip-stick artist to be contrasted, obtain the difference on each Frequency point of audio frequency, thus draw a speaker frequency response plot correction table, described correction table comprises the number that the frequency that will insert corrects point, and the centre frequency of wave filter needed for each Frequency point, filter type, filter Q and lifting or decay range parameter;
Parameter in C, the speaker frequency response plot correction table that obtains according to step B is arranged loudspeaker frequency response curve rectification module;
D, good loudspeaker frequency response curve rectification module set by step C being downloaded to separately special speaker frequency response plot corrects in debugging board, and repeat steps A, audio amplifier after overcorrection is tested, obtain the actual audio amplifier frequency response curve recorded after overcorrection, and contrast with the target frequency response curve formulated in step B, if both also have any different, then inching is carried out to speaker frequency response plot correction table, then according to the parameter in speaker frequency response plot correction table after inching, loudspeaker frequency response curve rectification module is arranged, repeat step step D more afterwards, until both are identical,
Parameter in E, the speaker frequency response plot correction table that adjusted by step D is arranged loudspeaker frequency response curve rectification module, then is added in DSP digital signal processing module by the loudspeaker frequency response curve rectification module set.
Be illustrated in figure 1 present system structured flowchart.Wherein, the rotary encoder of LCD display and band button is user interface, the all operations of user to system arrange all by the operation that turns clockwise to rotary encoder, be rotated counterclockwise operation or button realize, LCD display is used for the running status of Display System Function and each functional module and parameter, simultaneously, when user carries out Operation system setting, operation indicating is carried out to user; Audio analog signals input interface receive external audio signal input and carry out early stage noise reduction and amplification process, then signal is delivered to the analog input port of DSP digital signal processing module; DSP digital signal processing module carries analog/digital conversion and D/A switch, audio analog signals is converted to digital signal by analog/digital conversion module, digital audio and video signals is after treatment converted to simulating signal by D/A switch module again, then deliver to audio frequency power amplifier rear class to amplify further, native system all completes with all operations that audio frequency process is relevant in DSP digital signal processing module; Micro controller module is the control section of whole system, upon power-up of the system, first in control system, each module completes reset, then DSP program code and parameter are loaded in DSP by I2C bus, control LCD display by flow process completion system start step display by spi bus simultaneously, enter the main interface of control LCD display system after normal operating conditions until system, after this start to accept user operation and arrange.
Be illustrated in figure 2 the start step of system: first, system electrification; After system electrification, first micro controller module resets, and after having resetted, other module resets in control system again; In waiting system, all modules all complete the rear control LCD display company Logo that resets, then the program code of DSP digital signal processing and supplemental characteristic is loaded into in DSP digital signal processing chip, but now DSP is in mute state, after waiting for 2S, control LCD shows product type, and then the main interface of control LCD display system after 2S is waited for again, control DSP digital signal processing module is started working simultaneously, and whole system starts to enter normal duty, and microcontroller starts to accept user operation; Under the main interfacial state of system, user carrys out adjustment System master volume by rotating rotary encoder to the left or to the right.
If Fig. 3 is Operation system setting process flow diagram: under the main interfacial state of system, click the button of rotary encoder, system parameter setting state will be entered into, listed in Fig. 3 is the optional parameter value of all functional modules that can be arranged voluntarily by user and correspondence thereof in system, and for frequency response curve rectification module, loudness control module, signal pressure limit processing module, power amplifier peak power monitoring modular, height cent frequency module etc., be entirely the quality promoting audio amplifier to design, for different audio amplifiers and loudspeaker, the concrete function of module and parameter are the optimal cases fixedly selected, sightless concerning user, therefore user can not arrange these parameters.
After entering into system parameter setting state, select different function menus by rotating rotary encoder to the left or to the right.Rotary encoder will choose next menu item to right rotation one gear, and keep off to anticlockwise one, can choose Previous menu item, selected menu item can become flip displays, and parameter value corresponding on the right side of this menu item is then in normal display state.When needing to modify to the parameter value of certain function items, first the menu label that this function items chosen by rotary encoder is rotated, then rotary encoder is clicked, then enter into the optimum configurations state of this menu item, now, the label of menu item returns to normal display state, and by parameter value flip displays current for this menu item of right side, change parameter value to keep left and be shown as display placed in the middle, and add left and right two inverted triangle Direction Signs, when also having optional parameter on the left of current parameter value, the inverted triangle Direction Signs in display left side, otherwise do not show; When also having optional parameter on the right side of current parameter value, the inverted triangle Direction Signs on display right side, otherwise do not show.The optional parameter value list of menu item adopts the mode shown successively from left to right or from right to left to select for user.
When changing the parameter value of menu item, come into force, that is, to the adjustment each time that the parameter value of menu item does, capital is at once to a next state of functional module that in system, this menu item is corresponding should be had to switch, but a just interim duty, only have when log off optimum configurations state time, system just can be preserved done all modifications, and as next time start time module acquiescence duty.When after the parameter setting certain menu item, need to click rotary encoder to exit menu item parameter value and arrange state, system automatically returns to the selected state of this menu item, now can continue to modify to the parameter value of other function menu, and the method for adjustment of all menu item parameter values is identical.
When carrying out system reset, namely restore the system to the duty of system each functional module when dispatching from the factory, first operate rotary encoder and choose system reset menu, then rotary encoder is clicked, system the reset of control LCD display system can confirm that dialog interface confirms for user, now, by rotating rotary encoder to the left or to the right to select " YES " or " NO " label, and then click rotary encoder notice system executive system reset operation, if that select is " NO ", then system is left intact and directly turns back to the selected state of system reset menu, reset operation terminates, if that select is " YES ", then system starts to perform reset operation, and by the recovering state of all functions module in system to state when dispatching from the factory, then automatically return to the selected state of system reset menu, reset operation terminates.
Log off optimum configurations state.When after completion system optimum configurations, need to log off optimum configurations state the main interface of the system that turns back to, then need first to operate rotary encoder to choose and exit and preserve menu item, then rotary encoder is clicked, first system can preserve the parameter value of each menu item after change, preserves after terminating and automatically returns to the main interface display state of system.
In the system setup operation process flow diagram shown in Fig. 3, the implication of each mark is corresponding as follows:
Press: represent and click rotary encoder
Left: represent to anticlockwise rotary encoder
Right: represent to right rotation rotary encoder
Default value: expression system when dispatching from the factory or executive system reset after the default parameter value that uses of this menu item
Start value: represent and all use this parameter value to arrange by default when system is started shooting at every turn, duty when system electrification next time not affecting on the adjustment of this menu item parameter value during this this normal operating conditions external.
Audio amplifier frequency response curve is corrected: this module is for the audio amplifier of concrete model, its parameter is jointly debugged by loudspeaker design slip-stick artist, audio amplifier design engineer and audition slip-stick artist and is provided, be a fixing functional module, be therefore sightless to user, user can not adjust its parameter.
As above, shown in Fig. 4, be the comparing result of frequency response curve before rectification and after correcting of the audio amplifier of a use DSP audio digital signals process prime, curve 1 is the frequency response curve of audio amplifier bass unit before rectification, becomes curve 5 after overcorrection; Curve 2 is the frequency response curve of audio amplifier voice unit before rectification, becomes curve 6 after overcorrection.Module employs nine separate spike wave filters, and the parameter of each wave filter is as shown in table 1 below:
| Sequence number | Centre frequency: Hz | Quality factor Q value | Promote or attenuation amplitude: dB | Filter type |
| 1 | 70.00 | 1.5 | 6.0 | Peaking Filter |
| 2 | 160.00 | 3.0 | 1.0 | Peaking Filter |
| 3 | 550.00 | 2.0 | -5.0 | Peaking Filter |
| 4 | 1200.00 | 10.0 | -3.0 | Peaking Filter |
| 5 | 1700.00 | 5.0 | -2.0 | Peaking Filter |
| 6 | 3700.00 | 2.0 | -4.0 | Peaking Filter |
| 7 | 5500.00 | 5.0 | -3.0 | Peaking Filter |
| 8 | 8700.00 | 5.0 | 3.0 | Peaking Filter |
| 9 | 13200.00 | 5.0 | 5.0 | Peaking Filter |
Table 1
Promote or attenuation amplitude in table, promote on the occasion of expression to the signal of this frequency band, negative value represents and decays to the signal of this frequency band.Frequently, the cutoff frequency of bass is 2700.00Hz to high and low cent, and adopt Lin Kuici-Ruili (Linkwitz-Riley 48) 48 rank wave filter, end gain is 0dB; The initial frequency of high pitch is 2600.00Hz, and adopt Lin Kuici-Ruili (Linkwitz-Riley 48) 48 rank wave filter equally, end gain is 2.0dB.
As the optional audio of audio amplifier and the frequency response curve of correspondence thereof that Fig. 5 is a use DSP audio digital signals process prime.Disposal route is promote a certain frequency range of sound signal or decay equally, but use 10 sections of Parametric equalizers, construct a virtual acoustic environments effect, No. 10 curve M USIC in figure, not doing any process to signal, is the effect state of system default; The auditory effect at what No. 11 curve LIVE built is concert scene; The auditory effect that what No. 12 curve C LUB built is in club; No. 13 line SPEECH lines are then the treatment effects when connecing microphone to voice signal.
As Fig. 6 be depicted as the audio amplifier of a use DSP audio digital signals process prime different in installation site time the treatment effect contrast carried out.As under POLE support installing mode, the signal of below 1kHz is promoted, between 60 to 500Hz, about promote 6dB, be used for making up the low sonority that the sound makes an uproar to audio amplifier back side diffusion and weaken.
The treatment effect of the high and low sound processing module of audio amplifier of a use DSP audio digital signals process prime is depicted as Fig. 7, a spike wave filter is adopted to the process of bass, centre frequency is 65.00Hz, and quality factor (Q value) is 1.0, and end gain is 0; Adopt a spike wave filter equally to the process of high pitch, centre frequency is 11000.00Hz, and quality factor (Q value) is 5.0, and end gain is 0.Lifting or the attenuation range of high and low sound are+10dB ~-10dB, and middle curve is curve when not carrying out any process (0dB), above puts the curve after into maximum lift 10dB, transfers the curve after into maximum attenuation-10dB.High and low sound module is satisfied individual sense of hearing hobby and designing.
The setting of the effect that the super-bass loudspeaker box being depicted as a use DSP audio digital signals process prime as Fig. 8 is corrected frequency response curve and subwoofer cutoff frequency.No. 6 curves are the frequency response curve of original (not with the process of DSP audio digital signals), and No. 8 curves are that the process of band DSP audio digital signals is to the effect after frequency response curve rectification.Subwoofer cutoff frequency is set using a Lin Kuici-Ruili (Linkwitz-Riley 48) 48 rank wave filter, the cutoff frequency of No. 10 curves is 150.00Hz, the cutoff frequency of No. 11 curves is 120.00Hz, the cutoff frequency of No. 12 curves is 100.00Hz, the cutoff frequency of No. 13 curves is 80.00Hz, the cutoff frequency of No. 14 curves is 60.00Hz, and design parameter is then arranged voluntarily by user.
Claims (3)
1. a DSP audio digital signals disposal system, is characterized in that:
Described DSP audio digital signals disposal system comprises audio analog signals input interface module, DSP digital signal processing module, audio analog signals output interface module, single-chip microcomputer micro-control module, display module and user interface module, described display module, user interface module and DSP digital signal processing module are all connected with single-chip microcomputer micro-control module signal, and described audio analog signals input interface module and audio analog signals output interface module are all connected with DSP digital signal processing module signal;
Signal after process for connecting external audio signal input, signal amplification and improving signal to noise ratio (S/N ratio), and is sent into the analog input interface of DSP digital signal processing module by described audio analog signals input interface module;
Described DSP digital signal processing module is used for carrying out A/D conversion, digital signal processing to the simulated audio signal of input, exports high pitch, bass and subwoofer simulating signal after frequency division to audio analog signals output interface module again after process terminates by D/A conversion;
Described audio analog signals output interface module divides high pitch output channel, bass output channel and subwoofer output channel, high pitch output channel and bass output channel are connected with power amplifier rear class high pitch, bass amplifying circuit respectively, and the super low sound signal that subwoofer output channel exports is directly as the signal source of super-bass loudspeaker box;
Described display module, as user interface, indicates for Display System Function, module running status, parameter and user operation;
Described user interface module integration system all operations be set to one;
Described single-chip microcomputer micro-control module is used for the running status of other modules in control system;
Described DSP digital signal processing module comprises A/D modular converter, loudspeaker frequency response curve rectification module and the D/A modular converter that signal successively connects.
2. a DSP audio digital signals disposal route, is characterized in that, it comprises the following steps:
(1), set loudspeaker frequency response curve correct parameter and set other parameters by user interface module;
(2), external audio simulating signal input audio analog signals input interface module, then amplify through audio analog signals input interface module signal and improve after signal to noise ratio (S/N ratio) and be input to A/D modular converter, and then be transformed into audio digital signals through A/D modular converter and be input to loudspeaker frequency response curve rectification module;
(3) the loudspeaker frequency response curve rectification parameter that, loudspeaker frequency response curve rectification module sets according to step (1) processes the audio digital signals transmitted;
(4), by the audio digital signals after step (3) process be input to D/A modular converter, then transform through D/A modular converter and become audio analog signals;
(5) audio analog signals after, step (4) being transformed is exported by audio analog signals output interface module.
3. a kind of DSP audio digital signals disposal route according to claim 2, is characterized in that: the setting loudspeaker frequency response curve of described step (1) is corrected parameter and mainly comprised the following steps:
A, first use electroacoustical instrument, in the anechoic room of standard, record actual frequency response curve and the actual phase response curve of audio amplifier;
B, actual frequency response curve measured in steps A and the target frequency response curve formulated by loudspeaker slip-stick artist and audio amplifier slip-stick artist to be contrasted, obtain the difference on each Frequency point of audio frequency, thus draw a speaker frequency response plot correction table, described correction table comprises the number that the frequency that will insert corrects point, and the centre frequency of wave filter needed for each Frequency point, filter type, filter Q and lifting or decay range parameter;
Parameter in C, the speaker frequency response plot correction table that obtains according to step B is arranged loudspeaker frequency response curve rectification module;
D, good loudspeaker frequency response curve rectification module set by step C being downloaded to separately special speaker frequency response plot corrects in debugging board, and repeat steps A, audio amplifier after overcorrection is tested, obtain the actual audio amplifier frequency response curve recorded after overcorrection, and contrast with the target frequency response curve formulated in step B, if both also have any different, then inching is carried out to speaker frequency response plot correction table, then according to the parameter in speaker frequency response plot correction table after inching, loudspeaker frequency response curve rectification module is arranged, repeat step step D more afterwards, until both are identical,
Parameter in E, the speaker frequency response plot correction table that adjusted by step D is arranged loudspeaker frequency response curve rectification module, then is added in DSP digital signal processing module by the loudspeaker frequency response curve rectification module set.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105632511A (en) * | 2015-12-29 | 2016-06-01 | 太仓美宅姬娱乐传媒有限公司 | Sound processing method |
| CN105717834A (en) * | 2016-01-29 | 2016-06-29 | 广州市昇博电子科技有限公司 | DSP digital audio processing method |
| CN105764005A (en) * | 2016-03-02 | 2016-07-13 | 宁波音王电声股份有限公司 | Guitar power amplifier based on technology of DSP audio signal processing |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052242A (en) * | 2006-04-05 | 2007-10-10 | 哈曼贝克自动系统股份有限公司 | Method for automatically equalizing a sound system |
| CN201813517U (en) * | 2010-10-22 | 2011-04-27 | 史润宇 | Digital audio processing system based on digital sound processor (DSP) |
| CN201928400U (en) * | 2010-12-27 | 2011-08-10 | 广州飞达音响专业器材有限公司 | Digital active sounder with DSP (Digital Signal Processor) preprocessing function |
| CN102780942A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Control method of active sound box with built-in DSP (digital signal processor) |
| CN102780945A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Active sound box with built-in DSP (digital signal processor) and speaker system calibration method |
| CN203289623U (en) * | 2012-12-31 | 2013-11-13 | 广州励丰文化科技股份有限公司 | Active loudspeaker based on multiple-DSP (digital signal processor) system |
| US20140016797A1 (en) * | 2012-07-16 | 2014-01-16 | Ford Global Technologies, Llc | Method for Changing Audio System Mode for Roof Open/Closed Condition |
| CN103916792A (en) * | 2012-12-31 | 2014-07-09 | 广州励丰文化科技股份有限公司 | Active loudspeaker based on multi-DSP (digital signal processor) system |
-
2014
- 2014-11-25 CN CN201410685104.0A patent/CN104503297B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052242A (en) * | 2006-04-05 | 2007-10-10 | 哈曼贝克自动系统股份有限公司 | Method for automatically equalizing a sound system |
| CN201813517U (en) * | 2010-10-22 | 2011-04-27 | 史润宇 | Digital audio processing system based on digital sound processor (DSP) |
| CN201928400U (en) * | 2010-12-27 | 2011-08-10 | 广州飞达音响专业器材有限公司 | Digital active sounder with DSP (Digital Signal Processor) preprocessing function |
| US20140016797A1 (en) * | 2012-07-16 | 2014-01-16 | Ford Global Technologies, Llc | Method for Changing Audio System Mode for Roof Open/Closed Condition |
| CN102780942A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Control method of active sound box with built-in DSP (digital signal processor) |
| CN102780945A (en) * | 2012-08-09 | 2012-11-14 | 广州励丰文化科技股份有限公司 | Active sound box with built-in DSP (digital signal processor) and speaker system calibration method |
| CN203289623U (en) * | 2012-12-31 | 2013-11-13 | 广州励丰文化科技股份有限公司 | Active loudspeaker based on multiple-DSP (digital signal processor) system |
| CN103916792A (en) * | 2012-12-31 | 2014-07-09 | 广州励丰文化科技股份有限公司 | Active loudspeaker based on multi-DSP (digital signal processor) system |
Non-Patent Citations (1)
| Title |
|---|
| 张飞碧等: "《现代音响技术设计手册》", 31 July 2004, 机械工业出版社 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105632511A (en) * | 2015-12-29 | 2016-06-01 | 太仓美宅姬娱乐传媒有限公司 | Sound processing method |
| CN105717834A (en) * | 2016-01-29 | 2016-06-29 | 广州市昇博电子科技有限公司 | DSP digital audio processing method |
| CN105764005B (en) * | 2016-03-02 | 2019-01-29 | 音王电声股份有限公司 | A kind of guitar power amplifier based on DSP Audio Signal Processing technology |
| CN105764005A (en) * | 2016-03-02 | 2016-07-13 | 宁波音王电声股份有限公司 | Guitar power amplifier based on technology of DSP audio signal processing |
| CN106569780A (en) * | 2016-11-04 | 2017-04-19 | 北京飞利信电子技术有限公司 | Real-time audio processing method and system for multi-channel digital audio signal |
| CN106303836A (en) * | 2016-11-15 | 2017-01-04 | 广东小天才科技有限公司 | Method and device for adjusting stereo playing |
| CN106878806A (en) * | 2017-03-09 | 2017-06-20 | 深圳创维－Rgb电子有限公司 | Audio method of adjustment, device and television set |
| CN108471575A (en) * | 2018-05-14 | 2018-08-31 | 广东小天才科技有限公司 | Liquid discharge method for loudspeaker of mobile terminal and mobile terminal |
| CN108471575B (en) * | 2018-05-14 | 2020-07-03 | 广东小天才科技有限公司 | Liquid discharge method for loudspeaker of mobile terminal and mobile terminal |
| CN111314835A (en) * | 2018-12-11 | 2020-06-19 | 无锡华润矽科微电子有限公司 | Debugging system and method based on digital power amplifier chip |
| CN110798777A (en) * | 2019-04-30 | 2020-02-14 | 广州市新度音响有限公司 | DSP power amplifier and sound system thereof |
| CN112887877A (en) * | 2021-01-28 | 2021-06-01 | 歌尔科技有限公司 | Audio parameter setting method and device, electronic equipment and storage medium |
| CN112887877B (en) * | 2021-01-28 | 2023-09-08 | 歌尔科技有限公司 | Audio parameter setting method and device, electronic equipment and storage medium |
| CN114650494A (en) * | 2022-04-07 | 2022-06-21 | 广州天逸电子有限公司 | DSP sound system and automatic acoustic testing method thereof |
| CN114650494B (en) * | 2022-04-07 | 2022-10-14 | 广州天逸电子有限公司 | DSP sound system and sound system acoustic automatic testing method |
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