CN203289623U - Active loudspeaker based on multiple-DSP (digital signal processor) system - Google Patents
Active loudspeaker based on multiple-DSP (digital signal processor) system Download PDFInfo
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- CN203289623U CN203289623U CN2012207501765U CN201220750176U CN203289623U CN 203289623 U CN203289623 U CN 203289623U CN 2012207501765 U CN2012207501765 U CN 2012207501765U CN 201220750176 U CN201220750176 U CN 201220750176U CN 203289623 U CN203289623 U CN 203289623U
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Abstract
The utility model relates to the loudspeaker technology, in particular to an active loudspeaker based on a multiple-DSP (digital signal processor) system. The active loudspeaker comprises a signal input module, a digital audio processing module, an output buffering module, a power amplifier module, a loudspeaker module and a loudspeaker box control module which are sequentially arranged along the flow direction of signals, wherein the signal input module is used for receiving audio signals input into the active loudspeaker and transmitting the signals to the digital audio processing module, the digital audio processing module comprises a plurality of sound effect processors which are connected in series, audio signals processed by the digital audio processing module are subjected to amplification processing through the loudspeaker module then transmitted to the loudspeaker module and converted back into sounds, the digital audio processing module comprises a plurality of DSP processors which are connected in series along the flow direction of signals, the initial DSP processor is connected with the signal input module, the last DSP processor is connected with the power amplifier module, the last DSP processor is integrated with a DAC, and the plurality of sound effect processors are distributed into the plurality of DSP processors along the flow direction of signals.
Description
Technical field
The utility model relates to loudspeaker techniques, specifically a kind of active loudspeaker based on the multi-digital signal processor system.
Background technology
Active integrated baffle box (loud speaker and audio amplifier represent equivalent in this technique) has referred to the DSP module integrated and the audio amplifier of power amplifier module.For the fast debugging of realizing speaker system is proofreaied and correct, the multilayer audio can partly be set in the input processing of DSP module to be processed, for example comprise that audio amplifier layer DSP processes (for audio amplifier self), array layer DSP processes (for one group of audio amplifier) and system layer DSP processes (for whole speaker system), then by main control system, Synchronization Control or system synchronization control are controlled separately, organized to the audio amplifier of speaker system, simplify the system debug difficulty, shorten the system debug time.But realizing that the multilayer audio is processed need to be to having relatively high expectations that DSP processes, and general single dsp processor is more difficult realizes that this multilayer audio processes.
(1) the multilayer audio is processed is that audio that a plurality of one species are set is simultaneously processed it and realized, take three layers of EQ equilibrium treatment as example, three sound effect processors such as audio amplifier layer EQ processor, array layer EQ processor and system layer EQ processor need to be set simultaneously in dsp processor, this can greatly increase the data processing amount of dsp processor undoubtedly.And much sound effect processors are all realized (such as EQ equilibrium, frequency division, attenuation of air compensation etc.) by FIR filter or iir filter, and original amount of calculation was just larger, added and arranged simultaneously three layers.Therefore the dsp processor that performance is general may will can't be realized the processing of multilayer audio smoothly.
(2) for many frequency divisions audio amplifier, the DSP module except needs arrange input processing module, also need to arrange an output processing module for each loudspeaker unit.The audio signal that input processing module is done after total audio is processed and will be processed the audio signal of input audio amplifier is divided into multiple signals to each output processing module, and each output processing module is done audio targetedly according to corresponding loudspeaker unit characteristic again and processed.And the kind of the sound effect processor that adopts in input processing module and each output processing module can be arbitrarily.Therefore for the frequency division audio amplifier, the data processing amount of DSP processing module and amount of calculation are original just very large.
Therefore the processing capacity that improves the DSP module and be is one of the technical barrier in active loudspeaker field.
In addition, the core devices of DSP module is dsp processor (Digital Signal Processor, also referred to as digital signal processor)., because dsp processor can only processing digital signal,, if input audio signal is simulated audio signal, need first by ADC(Analog to Digital Converter analog to digital converter) convert simulated audio signal to digital signal.Digital signal is after the signal treatment step that dsp processor carries out various settings, again by DAC (Digital to Analog Converter, digital to analog converter) convert analog signal transmission to next sound box module, (by one or more independently loudspeaker units, being formed) such as power amplifier module, horn module.
But the characteristic due to DAC self, analog signal through DAC conversion output can be with a certain amount of background noise, the size of this background noise is roughly fixed, and is only relevant with DAC self, and the device of the digital audio and video signals of input audio amplifier or integrated this DAC is irrelevant.Although under general case, the audience generally is difficult for discovering the existence of this noise, this noise still exists after all, and power amplifier module can amplify output to this noise together with effective audio signal.When the audio signal volume (level) of input audio amplifier was too small, the noise that restores sound through loudspeaker unit will become obviously, even can affect amplifying effect and the whole sound effect of sound system of audio amplifier when serious.
Yet along with the raising of user to the audio processing requirements, the user wishes that the DSP module can provide more audio frequency processing capacity, such as phase response adjustment (BPPA), Multilevel method (audio amplifier layer, array layer, system layer) etc.These functions have exceeded and traditional by single dsp chip, have built DSP module by signal disposal ability, affect real-time and the reliability of audio transmission.
Therefore reduce another technical barrier that the DAC background noise is the active loudspeaker field.
The utility model content
The technical problem that the utility model solves is to provide a kind of active loudspeaker based on the multi-digital signal processor system that has than low noise, and makes its Digital audio process module have stronger disposal ability.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
a kind of active loudspeaker based on the multi-digital signal processor system, comprise according to signal and flow to the signal input module that sets gradually, Digital audio process module, the output buffer module, power amplifier module, horn module, and for the audio amplifier control module that above-mentioned one or more modules are controlled, described signal input module is used for receiving the audio signal of the described loud speaker of input and transferring to described Digital audio process module, described Digital audio process module comprises the sound effect processor of a plurality of series connection, transfer to described horn module through the audio signal that described Digital audio process module is processed after described horn module is amplified processing and be reduced into sound, wherein:
Described Digital audio process module comprises a plurality of dsp processors that flow to series connection by signal, an initial dsp processor receives the signal from described signal input module, the signal of a last dsp processor output transfers to described power amplifier module, and described last dsp processor is integrated with DAC, and described a plurality of sound effect processors flow to and are dispensed in described a plurality of dsp processor by signal.
One of improvement of the technical scheme: described output buffer module comprises the second unit for scaling and is used for the analog signal of described DAC conversion output is cushioned the first-level buffer unit of filter processor, described last dsp processor also comprises the first unit for scaling, described audio amplifier control module comprises the noise reduction control module, and the digital signal of processing through described Digital audio process module transfers to described power amplifier module through described the first unit for scaling, described DAC and described the second unit for scaling successively;
Described noise reduction control module is for detection of the digital signal level of processing through described Digital audio process module, when the signal level that detects during lower than pre-set threshold value, control described the first unit for scaling by preset multiple amplifying signal level, and control simultaneously described the second unit for scaling and dwindle signal level by this preset multiple; , control described the first unit for scaling and described the second unit for scaling and press the output of original signal level during higher than threshold values when the signal level that detects.
Two of improvement of the technical scheme: described Digital audio process module comprises the first dsp processor and the second dsp processor, and described DAC, described the first unit for scaling are arranged in described the second dsp processor.
Three of improvement of the technical scheme: described the first unit for scaling comprises the first switch unit, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are connected in parallel in described the first switch unit and described DAC, and described convergent-divergent passage is provided with the first level unit for scaling that signal level is amplified for by described preset multiple; Described the first switch unit is connected with described noise reduction control module, be used for to receive the digital signal of processing through described Digital audio process module, and according to the control signal of described noise reduction control module, select by described put-through channel or described convergent-divergent passage this digital data transmission described DAC extremely.
Four of improvement of the technical scheme: described the second unit for scaling comprises the second switch unit, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are connected in parallel in described the second switch unit and described power amplifier module, and described convergent-divergent passage is provided with the second electrical level unit for scaling that signal level is dwindled for by described preset multiple; Described the second switch unit is connected with described noise reduction control module, be used for receiving the analog signal of described DAC output, and according to the control signal of described noise reduction control module, select by described put-through channel or described convergent-divergent passage this analog signal transmission described power amplifier module extremely.
Five of improvement of the technical scheme: described output buffer module also comprises the level 2 buffering unit, described level 2 buffering unit is used for the signal of described the second unit for scaling output is carried out buffered, and the signal after buffered is transferred to described power amplifier module.
Six of improvement of the technical scheme: described noise reduction control module comprises noise reduction state feedback module, described noise reduction state feedback module is used for the signal level that detects when described noise reduction control module less than pre-set threshold value or when described noise reduction control module is controlled described the first described convergent-divergent channel transfer digital signal of switch unit selection, control that the status lamp that arranges on described loud speaker shows that volume is crossed mere suggestion and/or with this status information feedback to the main control system that connects with described loud speaker, thereby point out the input volume too small to the user.
Seven of improvement of the technical scheme: described Digital audio process module comprises input processing module and a plurality of output processing module; Described input processing module comprises a plurality of sound effect processors of series connection, each sound effect processor is used for, according to the processing parameter that sets, audio signal is carried out corresponding kind signal processing operations, wherein an initial sound effect processor receives the audio signal from described signal input module, and the audio signal after a last sound effect processor is processed is divided into the multichannel output audio signal and is transferred to a corresponding described output processing module; Each described output processing module comprises a plurality of sound effect processors of series connection, and an initial sound effect processor is filter, this filter is used for receiving a road output audio signal corresponding with described output processing module, and Dui Gaiyi road output audio signal carries out the filtering processing, thereby obtain the audio signal of default frequency range, the audio signal transmission after a last sound effect processor is processed is to described the first unit for scaling.
Eight of improvement of the technical scheme: each sound effect processor of described input processing module is arranged in described the first dsp processor, and each sound effect processor of each described output processing module is arranged in described the second dsp processor.
Nine of improvement of the technical scheme: each sound effect processor of described input processing module and the filter of each described output processing module are arranged in described the first dsp processor, and all the other sound effect processors of each described output processing module are arranged in described the second dsp processor.
Compared with prior art, the beneficial effect of technical scheme that the utility model adopts is as follows: because Digital audio process module adopts many DSP framework, each sound effect processor that Digital audio process module need to be able to be realized, such as delayer, silencer, phase response adjuster, multilayer EQ equalizer etc. is dispensed to each sound effect processor, improve thus the disposed of in its entirety ability of Digital audio process module, for the user provides more reliable, audio processing response fast.
In addition, the improvement project of present technique is also by the digital signal level size of noise reduction control module detected transmission to DAC, when detecting signal level when too small, the digital signal level that will be transferred to DAC at the DAC front end amplifies certain multiple, and in the rear end of DAC, will dwindle through the analog signal level of the DAC conversion output multiple with former amplification, this moment, the level of useful signal returned to original level, and the background noise of DAC reduced several times, thereby reach the purpose of noise reduction.
Description of drawings
Fig. 1 is the overall structure schematic diagram of embodiment.
Fig. 2 is the overall structure schematic diagram (take two dsp processors as example) of embodiment.
Fig. 3 is one of embodiment DAC principle of noise reduction schematic diagram.
Fig. 4 is two of embodiment DAC principle of noise reduction schematic diagram.
Fig. 5 is the noise reduction control module schematic diagram of embodiment.
Fig. 6 is the overall structure figure of embodiment.
Fig. 7 is the signal input module schematic diagram of embodiment.
Fig. 8 is the analog signal compression amplitude limiter schematic diagram of embodiment.
Fig. 9 is the compression amplitude limit unit schematic diagram of embodiment.
Figure 10 is the Digital audio process module sound effect processor distribution map (take input processing, being provided with 2 EQ equalizers as example) of embodiment.
Figure 11 is the Digital audio process module sound effect processor distribution map (take input processing, being provided with 3 EQ equalizers as example) of embodiment.
Figure 12 is one of the sound effect processor distribution mode that comprises of the Digital audio process module of embodiment (take two dsp processors as example).
Figure 13 is two (take two dsp processors as example) of the sound effect processor distribution mode that comprises of the Digital audio process module of embodiment.
Embodiment
In the utility model, term " on ", D score, " left side ", " right side ", 'fornt', 'back', " top ", " end ", " interior ", " outward ", " in ", orientation or the position relationship of the indications such as " vertically ", " level ", " laterally ", " vertically " be based on orientation shown in the drawings or position relationship.These terms are mainly in order to describe better the utility model and embodiment, not are used for limiting indicated device, element or part and must have particular orientation, or with particular orientation, construct and operate.
And above-mentioned part term except can being used for expression orientation or position relationship, also may be used for other implications of expression, for example term " on " also may be used for certain relations of dependence of expression or annexation in some cases.For those of ordinary skills, can understand as the case may be the concrete meaning of these terms in the utility model.
In addition, term " installation ", " setting ", " being provided with ", " connection ", " being connected " should be done broad understanding.For example, can be to be fixedly connected with, removably connect, or monolithic construction; Can be mechanical connection, or be electrically connected to; Can be directly to be connected, or by intermediary, indirectly be connected, or be connection inner between two devices, element or parts.For those of ordinary skills, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In addition, term " first ", " second " etc. are mainly be used to distinguishing different devices, element or part (concrete kind is identical with the structure possibility also may be different), not are used for showing or hinting relative importance and the quantity of indicated device, element or part.Except as otherwise noted, the implication of " a plurality of " is two or more.
Below in conjunction with embodiment and accompanying drawing, the technical solution of the utility model is further described.
As shown in Figure 1, the active loudspeaker based on the multi-digital signal processor system of the present embodiment comprises signal input module 10, Digital audio process module 20, output buffer module 50, power amplifier module 30, the horn module 40 that sets gradually according to the signal flow direction, and being used for the audio amplifier control module 90 that above-mentioned one or more modules are controlled, described signal input module is used for receiving the audio signal of the described loud speaker of input and transferring to described Digital audio process module.If the input audio amplifier is simulated audio signal, need to convert digital signal to by ADC, ADC can be arranged to individual devices, or is arranged in described signal input module, or is integrated into described Digital audio process module.Transfer to described horn module through the audio signal that described Digital audio process module is processed after described horn module is amplified processing and be reduced into sound.
Described Digital audio process module comprises the sound effect processor of a plurality of series connection.The described Digital audio process module that the present embodiment adopts comprises a plurality of dsp processors that flow to series connection by signal, an initial dsp processor is connected with described signal input module, a last dsp processor (directly or indirectly) is connected with described power amplifier module, and described last dsp processor is integrated with DAC, and described a plurality of sound effect processors flow to and are dispensed in described a plurality of dsp processor by signal.
In fact Digital audio process module of the present utility model also can adopt the dsp processor more than three or three, but adopts two dsp processors to set forth explanation with Digital audio process module for convenience.
As shown in Fig. 2 to 3, described Digital audio process module comprises the first dsp processor 21 and the second dsp processor 22, and described the second dsp processor 22 is provided with DAC 229 and the first unit for scaling 228.Described output buffer module 50 comprises the second unit for scaling 52 and is used for the analog signal of described DAC 229 conversion outputs is cushioned the first-level buffer unit 51 of filter processor.First-level buffer unit 51 can adopt active filter circuit to realize, first-level buffer unit 51 is except can cushioning DAC 229, can also adjust signal output level and output impedance, in order to mate incoming level and the impedance requirement of follow-up the second unit for scaling and/or power amplifier module 30.The digital signal of processing through described Digital audio process module 20 transfers to described power amplifier module 30 through described the first unit for scaling 228, described DAC 229 and described the second unit for scaling 52 successively.
Described audio amplifier control module 90 comprises noise reduction control module 95, described noise reduction control module 95 is for detection of the digital signal level of processing through described Digital audio process module 20, when the signal level that detects during lower than pre-set threshold value, control described the first unit for scaling 228 by preset multiple amplifying signal level, and control simultaneously described the second unit for scaling 52 and dwindle signal level by this preset multiple; , control described the first unit for scaling 228 and described the second unit for scaling 52 and press the output of original signal level during higher than threshold values when the signal level that detects.If the signal of output has multichannel after described Digital audio process module is processed, can at the front end of DAC, the first unit for scaling be set for every road signal, rear end arranges the second unit for scaling, and carry out noise reduction by the second unit for scaling Dui Mei road signal and control, namely the level of this road signal output detected when too low when the noise reduction control module, control simultaneously the reverse convergent-divergent (the former amplifies, and the latter dwindles) that the first unit for scaling on this road signalling channel and the second unit for scaling carry out identical multiple.
That is to say, when the signal level of input audio amplifier is too small, noise reduction control module 95 starts the noise reduction adjustment, control the first unit for scaling 228 and the second unit for scaling 52 with identical multiple synchronous backward convergent-divergent level, suppose that the first unit for scaling 228 has amplified 10 times with signal level, 52 of the second unit for scaling can correspondingly dwindle signal level 10 times.In tolerance interval, background noise is outstanding or while not affecting the audio amplifier sound field effect, noise reduction control module 95 controls the first unit for scaling 228 and the second unit for scaling 52 is kept the original signal level, does not change the level of signal when incoming signal level.If signal level equals threshold values just, both can be set as the adjustment of enabling signal noise reduction, also can be set as not enabling signal level and adjust and by former level, export.
As shown in Figure 5, described noise reduction control module 95 comprises: signal level detection module 2271, for detection of the digital signal level of Digital audio process module 20 processing; Noise reduction Executive Module 2272, be used for judging that whether described signal level detection module 2271 detects level lower than pre-set threshold value, if lower than threshold values, control described the first unit for scaling 228 by preset multiple amplifying signal level, and control simultaneously described the second unit for scaling 52 and dwindle signal level by this preset multiple; If higher than threshold values, control described the first unit for scaling 228 and described the second unit for scaling 52 is exported by the original signal level.
As shown in Figure 4, described the first unit for scaling 228 comprises the first switch unit 2281, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are connected in parallel in described the first switch unit 2281 and described DAC 229, and described convergent-divergent passage is provided with the first level unit for scaling 2282 that signal level is amplified for by described preset multiple, and the signal level of transmitting through put-through channel does not change.
Described the first switch unit 2281 is connected with described noise reduction control module 95, be used for to receive the digital signal of processing through described Digital audio process module 20, and according to the control signal of described noise reduction control module 95, select by described put-through channel or described convergent-divergent passage this digital data transmission described DAC 229 extremely.The signal level that detects when noise reduction control module 95 during higher than pre-set threshold value, will be sent the control signal of selecting the put-through channel transmission of digital signals to the first switch unit 2281, and the signal level of output is constant; The signal level that detects when noise reduction control module 95 is during lower than pre-set threshold value, to send the control signal of selecting convergent-divergent channel transfer digital signal to the first switch unit 2281, signal carries out according to preset multiple through the first level unit for scaling 2282 after level amplifies processing exporting.
As shown in Figure 4, described the second unit for scaling 52 comprises the second switch unit 521 put-through channels (not label) and convergent-divergent passage (not label), described put-through channel and described convergent-divergent passage are connected in parallel in described the second switch unit 521 and described power amplifier module 30, described convergent-divergent passage is provided with the second electrical level unit for scaling 522 that signal level is dwindled for by described preset multiple, and the signal level of transmitting through put-through channel does not change.Second electrical level unit for scaling 522 can adopt resistor voltage divider circuit or discharge circuit to realize, while especially adopting resistor voltage divider circuit to realize,, because output impedance is larger, need to connect again input impedance and level requirement that a level 2 buffering unit (can adopt amplifier realize) mates follow-up power amplifier module to output impedance and level adjustment.
Described the second switch unit 521 is connected with described noise reduction control module 95, be used for receiving the analog signal of described DAC 229 outputs, and according to the control signal of described noise reduction control module 95, select by described put-through channel or described convergent-divergent passage this analog signal transmission described power amplifier module 30 extremely.The signal level that detects when noise reduction control module 95 during higher than pre-set threshold value, will be sent the control signal of selecting the put-through channel transmission of analogue signal to the second switch unit 521, and the signal level of output is constant; The signal level that detects when noise reduction control module 95 is during lower than pre-set threshold value, to send the control signal of selecting convergent-divergent channel transfer analog signal to the second switch unit 521, analog signal carries out according to preset multiple through second electrical level unit for scaling 522 after level dwindles processing exporting.Second electrical level unit for scaling 522 can adopt conventional discharge circuit or resistor voltage divider circuit to realize, while especially adopting resistor voltage divider circuit, for level and the impedance that makes 522 outputs of second electrical level unit for scaling is complementary with follow-up power amplifier module 30 better, can set up buffer cell at second electrical level unit for scaling 522 outputs, the analog signal of dwindling output through second electrical level unit for scaling 522 is transferred to power amplifier module 30 again after the buffer cell adjustment.
Described output buffer module 50 also comprises level 2 buffering unit 53, and described level 2 buffering unit 53 is used for the signal of described the second unit for scaling 52 outputs is carried out buffered, and the signal after buffered is transferred to described power amplifier module 30.Level 2 buffering unit 53 can be adjusted level and the impedance of the second unit for scaling 52 output signals, makes it and described power amplifier module 30 couplings.
as Fig. 5, shown in Figure 6, described noise reduction control module 95 comprises noise reduction state feedback module 951, described noise reduction state feedback module 951 is used for the signal level that detects when described noise reduction control module 95 less than pre-set threshold value or when described noise reduction control module 95 is controlled described the first switch unit 2281 described convergent-divergent channel transfer digital signal of selection, control the status lamp 61 that arranges on described audio amplifier show volumes cross mere suggestion (as flicker or word, showing) and/or with this status information feedback to as described in the main control system that connects of audio amplifier (or be called control platform), thereby to the user, point out the input volume too small.
as Fig. 6, shown in Figure 7, described signal input module 10 comprises for the analog input interface 11 that receives simulated audio signal, be used for receiving the AES input interface 12 of AES digital audio and video signals, the RJ45 input interface 13 that is used for the digital audio and video signals (digital audio and video signals of AES or extended formatting) of reception Internet Transmission, analog signal compression amplitude limiter 15(is also referred to as compressor), digital audio transmitter 16(Digital Audio Transmitter), wherein, described analog input interface 11 is connected with described Digital audio process module 20 by described analog signal compression amplitude limiter 15, described AES input interface 12, RJ45 input interface 13 is connected with described Digital audio process module 20 by described digital audio transmitter 16 respectively, and described audio amplifier control module 90 is connected with described RJ45 input interface 13.
Described audio amplifier control module 90 is connected with the external control main frame by described RJ45 input interface 13, make main control system control audio amplifier control module 90, audio amplifier control module 90 is controlled each controlled module or the unit of audio amplifier according to the control signal of main control system again, the setting of audio processing parameters as various in the DSP of Digital audio process module 20, the setting of power amplifier parameter, signal input module 10 input channel Route Selection etc., to realize the Remote management of audio amplifier.Audio amplifier control module 90 can also, with the audio amplifier state information,, as noise reduction state, compression amplitude limit state, power amplifier state, temperature, radiator fan 64 rotating speeds etc., feed back to the control main control system, to realize that the audio amplifier of dispersed placement is concentrated monitoring simultaneously.Digital audio and video signals through AES input interface, RJ45 input interface 13 input audio amplifiers converts the form that can directly for dsp processor, directly process to by the digital audio transmitter.The simulated audio signal of input audio amplifier need to convert digital signal to by ADC, and ADC can be arranged in signal input module 10, as is arranged on the rear end of analog compression amplitude limit, also can be integrated in Digital audio process module 20.In addition, signal input module 10 can also be set up RJ45 output interface 14,, in order to carry out cascade between audio amplifier, facilitates user flexibility to build the audio amplifier interconnection network.Consider that the built-in power amplifier module 30 of active audio amplifier needs heat radiation, audio amplifier inside generally is provided with radiator fan 64 and for detection of the temperature sensor of power amplifier and/or audio amplifier internal temperature, for the information such as state of temperature and radiator fan 64 rotating speeds are fed back to main control system, audio amplifier control module 90 can directly be connected and obtain data with temperature sensor, radiator fan 64, or indirectly by devices such as Mega8 62, obtains radiator fan 64 rotary speed informations.
as Fig. 2, Fig. 6 and shown in Figure 7, described audio amplifier control module 90 also comprises be used to the first control module 91 of controlling described signal input module 10, described the first control module 91(and described analog signal compression amplitude limiter be connected the digital audio transmitter and be connected) comprise and compress amplitude limit state feedback module (not shown), described compression amplitude limit state feedback module is used for when described analog signal compression amplitude limiter starts compression or amplitude limit function, control the status lamp 61 that arranges on described audio amplifier show volumes cross mere suggestion (as flicker or word, showing) and/or with this status information feedback to as described in the main control system that connects of audio amplifier, thereby to the user, point out the input volume excessive.
as Fig. 8, shown in Figure 9, described analog signal compression amplitude limiter comprises that flowing to by signal the prime balance that connects successively turns non-equilibrium input unit 151, compression amplitude limit unit 152 and the non-equilibrium balance output unit 153 that turns, described compression amplitude limit unit 152 comprises: be connected in described prime balance and turn non-equilibrium input unit 152 and the described non-equilibrium anti-phase operation amplifier module that turns balance output unit 153, and press signal and flow to the active half-wave rectification block that connects successively, the logarithm operation amplification module, the differential amplification module, the anti-phase computing buffer module of equal proportion and switch adjustment pipe, wherein said active half-wave rectification block is connected with described anti-phase operation amplifier module output, the anti-phase computing buffer module of described equal proportion is connected with described anti-phase operation amplifier module, described switch adjustment pipe is connected with described anti-phase operation amplifier module, in addition, the described non-equilibrium balance output unit that turns carries out non-equilibrium turn balance and anti-phase processing to the received signal.
As shown in figure 10, described Digital audio process module 20 comprises input processing module and a plurality of output processing module.
Described input processing module comprises a plurality of sound effect processors of series connection, each sound effect processor is used for, according to the processing parameter that sets, audio signal is carried out corresponding kind signal processing operations, wherein an initial sound effect processor receives the audio signal from described signal input module 10, and the audio signal after a last sound effect processor is processed is divided into the multichannel output audio signal and is transferred to a corresponding described output processing module;
Each described output processing module comprises a plurality of sound effect processors of series connection, and an initial sound effect processor is filter, this filter is used for receiving a road output audio signal corresponding with described output processing module, and Dui Gaiyi road output audio signal carries out the filtering processing, thereby obtain the audio signal of default frequency range, the audio signal transmission after a last sound effect processor is processed is to described the first unit for scaling 228.
For realizing the multilayer adjustable function, described input processing module comprises one or more sound effect processors, and have at least the described input processing module of a kind of sound effect processor to include the sound effect processor of at least two these kinds, one of them is the audio amplifier layer sound effect processor of setting for audio amplifier self, also have one to be for the unified array layer sound effect processor of setting of each audio amplifier member of array group under audio amplifier, each array group comprises a plurality of audio amplifiers, and the parameter of array layer sound effect processor of correspondence of audio amplifier that belongs to same array group is identical.In addition, can also be provided with for the described input processing module of any sound effect processor the system layer sound effect processor that belongs to this kind sound effect processor type, the system layer sound effect processor is for the unified system group layer sound effect processor of setting of each audio amplifier member of system group under described audio amplifier.Each system group comprises one or more audio amplifiers, and/or comprises one or more array group, and the parameter of system layer sound effect processor of correspondence of audio amplifier that belongs to same system group is identical.General an of speaker system need arrange a system group and get final product.Each sound effect processor series connection that described input processing module comprises.
As an example of the EQ equilibrium example, input processing module being comprised two or three these kind sound effect processors describes.
(1) two EQ equilibrium.As shown in figure 11, input processing module comprises two EQ equalizers, one is audio amplifier layer EQ equalizer, another is array layer EQ equalizer, this audio amplifier layer EQ equalizer is used for according to for whose fixed EQ processing parameter of described audio amplifier self, audio signal being carried out the EQ equilibrium treatment, and this array layer EQ equalizer is used for the EQ processing parameter set unified according to each audio amplifier member for the described array group of affiliated audio amplifier audio signal is carried out the EQ equilibrium treatment.
(2) three EQ equilibriums.as shown in figure 10, input processing module comprises three EQ equalizers, one is audio amplifier layer EQ equalizer, one is array layer EQ equalizer, also having one is system layer EQ equalizer, this audio amplifier layer EQ equalizer is used for according to for whose fixed EQ processing parameter of described audio amplifier self, audio signal being carried out the EQ equilibrium treatment, this array layer EQ equalizer is used for, according to the EQ processing parameter that each audio amplifier member for the described array group of affiliated audio amplifier unifies to set, audio signal is carried out the EQ equilibrium treatment, this system layer EQ equalizer is used for, according to the EQ processing parameter that each audio amplifier member for system group under described audio amplifier unifies to set, audio signal is carried out the EQ equilibrium treatment.Input processing module in accompanying drawing 11 comprises input silencer, input gain device, input time delay device, input polarity controller, input air attenuation equalizer, audio amplifier layer EQ equalizer, array layer EQ equalizer and the system layer EQ equalizer of series connection successively.
Each described input processing module comprises one or more following sound effect processors: input silencer, input gain device, input time delay device, input polarity controller, input air attenuation equalizer, EQ equalizer, input compression amplitude limiter, and wherein: this input silencer is used for that audio signal is carried out silence switch to be processed; This input gain device is processed for audio that audio signal is gained; This input time delay device is used for audio signal is carried out delay process; This input polarity controller is used for audio signal is carried out Polarity Control; This input air attenuation equalizer is used for audio signal is carried out the attenuation of air compensation deals; This input EQ equalizer is used for that audio signal is carried out the balanced audio of EQ to be processed; This input compression amplitude limiter is used for audio signal is compressed amplitude limiting processing.
Each described output processing module comprises filter and one or more following sound effect processors: output mute device, output gain device, output delayer, output polarity controller, delivery air attenuation equalizer, output EQ equalizer, output squeezing amplitude limiter, wherein:
This filter be used for to receive the corresponding road output audio signal of this described output processing module, and Dui Gaiyi road output audio signal carries out the filtering processing, thus obtain with this described output processing module the sound frequency range that is complementary of corresponding power amplifier unit;
This input silencer is used for that the road output audio signal that this described output processing module receives is carried out silence switch to be processed;
This input gain device is used for the road output audio signal that this described output processing module the receives audio that gains is processed;
The road output audio signal that this input time delay device is used for this described output processing module is received carries out delay process;
The road output audio signal that this input polarity controller is used for this described output processing module is received carries out Polarity Control;
The road output audio signal that this input air attenuation equalizer is used for this described output processing module is received carries out the attenuation of air compensation deals;
These input and output EQ equalizer is used for that the road output audio signal that this described output processing module receives is carried out the balanced audio of EQ to be processed;
The road output audio signal that this input compression amplitude limiter is used for this described output processing module is received compresses amplitude limiting processing; Each audio processing module series connection of described output processing module, come a last sound effect processor and be connected with described power amplifier module 30.When output audio signal after last sound effect processor of output processing module is processed, this output audio signal directly or indirectly transfers to a power amplifier unit corresponding in power amplifier module 30, output audio signal transfers to loudspeaker unit corresponding in horn module 40 again after power amplifier unit amplifies processing, finally by loudspeaker unit, be reduced into sound.
As previously mentioned, the sound effect processor that comprises of described Digital audio process module (sound effect processor that comprises input processing module and each output processing module) flows to and is dispensed in described a plurality of dsp processor by signal.In an embodiment, can take dual mode to distribute these sound effect processors.
(1) as shown in figure 12, each sound effect processor of described input processing module is arranged in described the first dsp processor 21 first kind of way, and each sound effect processor of each described output processing module is arranged in described the second dsp processor 22.
(2) second way as shown in figure 13, each sound effect processor of described input processing module and the filter of each described output processing module are arranged in described the first dsp processor 21, and all the other sound effect processors of each described output processing module are arranged in described the second dsp processor 22.
in addition, described first dsp processor 21 initial as described Digital audio process module also comprises the signal routing module, and for the analog signal input channel and the digital signal input channel that receive from described signal input module 10 signals, described analog signal input channel, described digital signal input channel is connected with described signal routing module respectively, and also be provided with on described digital signal input channel for digital signal sampling rate being mated the sampling rate converter of conversion, the road input signal that described signal routing module will be selected transfers to the described initial sound effect processor in described input processing module.
In addition, described audio amplifier control module 90 also comprises be used to the second control module 92 of controlling described the first dsp processor 21, for the 3rd control module 93 of controlling described the second dsp processor 22 with for the 4th control module 94 of controlling described power amplifier module 30.Described the second control module 92 is set or upgrades the parameter of each sound effect processor in described the first dsp processor 21 according to the control signal of the main control system that is connected with audio amplifier, perhaps according to the instruction of main control system with the parameter feedback of sound effect processor in described the first dsp processor 21 to main control system.Described the 3rd control module 93 is set or upgrades the parameter of each sound effect processor in described the second dsp processor 22 according to the control signal of the main control system that is connected with audio amplifier, perhaps according to the instruction of main control system with the parameter feedback of sound effect processor in described the second dsp processor 22 to main control system.
Claims (13)
1. active loudspeaker based on the multi-digital signal processor system, comprise according to signal and flow to the signal input module that sets gradually, Digital audio process module, the output buffer module, power amplifier module, horn module, and for the audio amplifier control module that above-mentioned one or more modules are controlled, described signal input module is used for receiving the audio signal of the described loud speaker of input and transferring to described Digital audio process module, described Digital audio process module comprises the sound effect processor of a plurality of series connection, transfer to described horn module through the audio signal that described Digital audio process module is processed after described horn module is amplified processing and be reduced into sound, it is characterized in that:
Described Digital audio process module comprises a plurality of dsp processors that flow to series connection by signal, an initial dsp processor receives the signal from described signal input module, the signal of a last dsp processor output transfers to described power amplifier module, and described last dsp processor is integrated with DAC, and described a plurality of sound effect processors flow to and are dispensed in described a plurality of dsp processor by signal.
2. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 1, it is characterized in that: described output buffer module comprises the second unit for scaling and is used for the analog signal of described DAC conversion output is cushioned the first-level buffer unit of filter processor, described last dsp processor also comprises the first unit for scaling, described audio amplifier control module comprises the noise reduction control module, the digital signal that the described Digital audio process module of process is processed is successively through described the first unit for scaling, described DAC and described the second unit for scaling transfer to described power amplifier module,
Described noise reduction control module is for detection of the digital signal level of processing through described Digital audio process module, when the signal level that detects during lower than pre-set threshold value, control described the first unit for scaling by preset multiple amplifying signal level, and control simultaneously described the second unit for scaling and dwindle signal level by this preset multiple; , control described the first unit for scaling and described the second unit for scaling and press the output of original signal level during higher than threshold values when the signal level that detects.
3. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 2, it is characterized in that: described Digital audio process module comprises the first dsp processor and the second dsp processor, and described DAC, described the first unit for scaling are arranged in described the second dsp processor.
4. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system, it is characterized in that: described the first unit for scaling comprises the first switch unit, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are connected in parallel in described the first switch unit and described DAC, and described convergent-divergent passage is provided with the first level unit for scaling that signal level is amplified for by described preset multiple;
Described the first switch unit is connected with described noise reduction control module, be used for to receive the digital signal of processing through described Digital audio process module, and according to the control signal of described noise reduction control module, select by described put-through channel or described convergent-divergent passage this digital data transmission described DAC extremely.
5. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system, it is characterized in that: described the first unit for scaling comprises the first switch unit, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are in parallel, and described convergent-divergent passage is provided with the first level unit for scaling that signal level is amplified for by described preset multiple;
Described the first switch unit be used for to receive the digital signal of processing through described Digital audio process module, and according to the control signal of described noise reduction control module, selects by described put-through channel or described convergent-divergent passage this digital data transmission described DAC extremely.
6. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system is characterized in that:
Described the second unit for scaling comprises the second switch unit, put-through channel and convergent-divergent passage, described put-through channel and described convergent-divergent passage are connected in parallel in described the second switch unit and described power amplifier module, and described convergent-divergent passage is provided with the second electrical level unit for scaling that signal level is dwindled for by described preset multiple;
Described the second switch unit is connected with described noise reduction control module, be used for receiving the analog signal of described DAC output, and according to the control signal of described noise reduction control module, select by described put-through channel or described convergent-divergent passage this analog signal transmission described power amplifier module extremely.
7. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system is characterized in that:
Described the second unit for scaling comprises the second switch unit, put-through channel and convergent-divergent passage, and described put-through channel and described convergent-divergent passage are in parallel, and described convergent-divergent passage is provided with the second electrical level unit for scaling that signal level is dwindled for by described preset multiple;
Described the second switch unit is used for receiving the analog signal of described DAC output, and according to the control signal of described noise reduction control module, selects by described put-through channel or described convergent-divergent passage this analog signal transmission described power amplifier module extremely.
8. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system, it is characterized in that: described output buffer module also comprises the level 2 buffering unit, described level 2 buffering unit is used for the signal of described the second unit for scaling output is carried out buffered, and the signal after buffered is transferred to described power amplifier module.
9. according to claim 2 or 3 described a kind of active loudspeakers based on the multi-digital signal processor system, it is characterized in that: described noise reduction control module comprises noise reduction state feedback module, when described noise reduction state feedback module is used for the signal level that detects when described noise reduction control module less than pre-set threshold value, control that the status lamp that arranges on described loud speaker shows that volume is crossed mere suggestion and/or with this status information feedback to the main control system that connects with described loud speaker, thereby point out the input volume too small to the user.
10. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 2, it is characterized in that: described Digital audio process module comprises input processing module and a plurality of output processing module;
Described input processing module comprises a plurality of sound effect processors of series connection, each sound effect processor is used for, according to the processing parameter that sets, audio signal is carried out corresponding kind signal processing operations, wherein an initial sound effect processor receives the audio signal from described signal input module, and the audio signal after a last sound effect processor is processed is divided into the multichannel output audio signal and is transferred to a corresponding described output processing module;
Each described output processing module comprises a plurality of sound effect processors of series connection, and an initial sound effect processor is filter, this filter is used for receiving a road output audio signal corresponding with described output processing module, and Dui Gaiyi road output audio signal carries out the filtering processing, thereby obtain the audio signal of default frequency range, the audio signal transmission after a last sound effect processor is processed is to described the first unit for scaling.
11. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 3 is characterized in that: described Digital audio process module comprises input processing module and a plurality of output processing module;
Described input processing module comprises a plurality of sound effect processors of series connection, each sound effect processor is used for, according to the processing parameter that sets, audio signal is carried out corresponding kind signal processing operations, wherein an initial sound effect processor receives the audio signal from described signal input module, and the audio signal after a last sound effect processor is processed is divided into the multichannel output audio signal and is transferred to a corresponding described output processing module;
Each described output processing module comprises a plurality of sound effect processors of series connection, and an initial sound effect processor is filter, this filter is used for receiving a road output audio signal corresponding with described output processing module, and Dui Gaiyi road output audio signal carries out the filtering processing, thereby obtain the audio signal of default frequency range, the audio signal transmission after a last sound effect processor is processed is to described the first unit for scaling.
12. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 11, it is characterized in that: each sound effect processor of described input processing module is arranged in described the first dsp processor, and each sound effect processor of each described output processing module is arranged in described the second dsp processor.
13. a kind of active loudspeaker based on the multi-digital signal processor system according to claim 11, it is characterized in that: each sound effect processor of described input processing module and the filter of each described output processing module are arranged in described the first dsp processor, and all the other sound effect processors of each described output processing module are arranged in described the second dsp processor.
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| CN2012207501765U CN203289623U (en) | 2012-12-31 | 2012-12-31 | Active loudspeaker based on multiple-DSP (digital signal processor) system |
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| CN2012207501765U CN203289623U (en) | 2012-12-31 | 2012-12-31 | Active loudspeaker based on multiple-DSP (digital signal processor) system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503297A (en) * | 2014-11-25 | 2015-04-08 | 宁波中荣声学科技有限公司 | DSP audio digital signal processing system and method |
| CN110231786A (en) * | 2019-05-16 | 2019-09-13 | 杭州众传数字设备有限公司 | A kind of MCVF multichannel voice frequency switch |
-
2012
- 2012-12-31 CN CN2012207501765U patent/CN203289623U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503297A (en) * | 2014-11-25 | 2015-04-08 | 宁波中荣声学科技有限公司 | DSP audio digital signal processing system and method |
| CN110231786A (en) * | 2019-05-16 | 2019-09-13 | 杭州众传数字设备有限公司 | A kind of MCVF multichannel voice frequency switch |
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