CN103916755A - Active integrated sound box with multi-DSP (digital signal processor) system - Google Patents
Active integrated sound box with multi-DSP (digital signal processor) system Download PDFInfo
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Abstract
The invention relates to a sound box technology, and specifically discloses an active integrated sound box with a multi-DSP (digital signal processor) system. The active integrated sound box with the multi-DSP system comprises the following modules which are successively arranged according to signal flow: a signal input module, a digital audio processing module, a DAC, an output buffer module, a power amplification module, a speaker module, and a sound box control module for controlling one or more aforementioned modules. The signal input module is used for receiving audio signals input into the sound box and transmitting the audio signals to digital audio processing module; the digital audio processing module comprises multiple sound effect processors arranged in an input processing module and multiple output processing modules; and the digital audio processing module also comprises multiple DSPs which are connected in series according to the signal flow. An initial DSP is connected with the signal input module, a last DSP is connected with the power amplification module, and the multiple sound effect processors are distributed to the multiple DSPs according to the signal flow.
Description
Technical field
The present invention relates to technology for loudspeaker box, specifically a kind of active integrated baffle box with multi-digital signal processor system.
Background technology
Active integrated baffle box (audio amplifier and audio amplifier represent equivalent in this technique) has referred to DSP module integrated and the audio amplifier of power amplifier module.For the fast debugging of realizing sound box system is proofreaied and correct, can the processing of multilayer audio be set in the input processing part of DSP module, 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 sound box system), then by main control system, Synchronization Control or system synchronization control are controlled separately, organized to the audio amplifier of sound box system, simplify system debug difficulty, shorten the system debug time.But realize having relatively high expectations that the processing of multilayer audio need to process DSP, general single dsp processor is more difficult realizes the processing of this multilayer audio.
(1) processing of multilayer audio is that audio that multiple 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 in dsp processor simultaneously, and this can greatly increase the data processing amount of dsp processor undoubtedly.Such as, and much sound effect processors are all realized (EQ equilibrium, frequency division, attenuation of air compensation etc.) by FIR filter or iir filter, original amount of calculation was just larger, added and arranged three layers simultaneously.Therefore the dsp processor that performance is general may will cannot be realized the processing of multilayer audio smoothly.
(2), for many frequency divisions audio amplifier, DSP module, except needs arrange input processing module, also need to arrange an output processing module for each loudspeaker unit.Input processing module does total audio processing and audio signal after treatment is divided into multiple signals to each output processing module the audio signal of input audio amplifier, and each output processing module does audio processing targetedly according to corresponding loudspeaker unit characteristic again.And the kind of the sound effect processor adopting in input processing module and each output processing module can be arbitrarily.Therefore for 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 DSP module and be is one of the technical barrier in active audio amplifier 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.After the signal treatment step that digital signal is carried out various settings through dsp processor, again by DAC (Digital to Analog Converter, digital to analog converter) such as convert analog signal transmission to, to next sound box module, power amplifier module, horn module etc. (being formed by one or more independently loudspeaker units).
But due to the characteristic of 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, only relevant with DAC self, and the input digital audio and video signals of audio amplifier or the device of integrated this DAC have nothing to do.Although audience is generally difficult for discovering the existence of this noise under general case, this noise still exists after all, and power amplifier module can amplify output together with effective audio signal this noise.When the audio signal volume (level) of input audio amplifier is when too small, the noise that restores sound through loudspeaker unit will become obviously, even can affect amplifying effect and the sound system entirety sound effect of audio amplifier when serious.
Such as, but along with the raising of user to audio processing requirements, user wishes that DSP module can provide more audio frequency processing capacity, phase response adjustment (BPPA), Multilevel method (audio amplifier layer, array layer, system layer) etc.These functions have exceeded and traditional have built DSP module by signal disposal ability by single dsp chip, affect real-time and the reliability of audio transmission.
Therefore reducing DAC background noise is another technical barrier in active audio amplifier field.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of active integrated baffle box with multi-digital signal processor system having compared with 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 used in the present invention is:
A kind of active integrated baffle box with multi-digital signal processor system, comprise according to signal and flow to the signal input module setting gradually, Digital audio process module, DAC, output buffer module, power amplifier module, horn module, and audio amplifier control module for above-mentioned one or more modules are controlled, described signal input module is for receiving the audio signal of the described audio amplifier of input and transferring to described Digital audio process module, described Digital audio process module comprises the sound effect processor of multiple series connection, after described horn module is amplified processing, transfer to described horn module through the audio signal of described Digital audio process module processing and be reduced into sound, described Digital audio process module comprises input processing module and multiple output processing module, wherein, described input processing module comprises multiple sound effect processors of series connection, each sound effect processor is for carrying out corresponding kind signal processing operations according to the processing parameter setting to audio signal, wherein an initial sound effect processor receives the audio signal from described signal input module, a last sound effect processor audio signal after treatment is divided into multichannel output audio signal and is transferred to a corresponding described output processing module, each described output processing module comprises multiple sound effect processors of series connection, and an initial sound effect processor is filter, this filter is for receiving Yi corresponding to described output processing module road output audio signal, and Dui Gai mono-road output audio signal carries out filtering processing, thereby obtain the audio signal of default frequency range,
Wherein:
Described Digital audio process module comprises the multiple dsp processors that flow to series connection by signal, an initial dsp processor is connected with described signal input module, a last dsp processor is connected with described power amplifier module, and described multiple sound effect processors flow to and are dispensed in described multiple dsp processor by signal.
One of improvement of technique scheme: described output buffer module comprises the second unit for scaling and cushions the first-level buffer unit of filter processor for the analog signal that described DAC conversion is exported, described last dsp processor comprises the first unit for scaling, described audio amplifier control module comprises noise reduction control module, transfers to described power amplifier module successively through the digital signal of described Digital audio process module processing through described the first unit for scaling, described DAC and described the second unit for scaling;
Described noise reduction control module is for detection of the digital signal level through described Digital audio process module processing, when the signal level detecting is during lower than pre-set threshold value, control described the first unit for scaling by preset multiple amplifying signal level, and control described the second unit for scaling simultaneously and dwindle signal level by this preset multiple; When the signal level detecting is during higher than threshold values, control described the first unit for scaling and described the second unit for scaling is exported by original signal level.
Two of the improvement of technique scheme: described Digital audio process module comprises the first dsp processor and the second dsp processor, described the first unit for scaling and described noise reduction control module are arranged in described the second dsp processor.
Three of the improvement of technique 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 for signal level being amplified by described preset multiple; Described the first switch unit is connected with described noise reduction control module, for receiving digital signal through described Digital audio process module processing, and select by described put-through channel or described convergent-divergent passage extremely described DAC of this digital data transmission according to the control signal of described noise reduction control module.
Four of the improvement of technique 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 for signal level being dwindled by described preset multiple; Described the second switch unit is connected with described noise reduction control module, for receiving the analog signal of described DAC output, and select by described put-through channel or described convergent-divergent passage extremely described power amplifier module of this analog signal transmission according to the control signal of described noise reduction control module.
Five of the improvement of technique scheme: described output buffer module also comprises level 2 buffering unit, described level 2 buffering unit carries out buffered for the signal that described the second unit for scaling is exported, and the signal after buffered is transferred to described power amplifier module.
Six of the improvement of technique scheme: described noise reduction control module comprises noise reduction state feedback module, described noise reduction state feedback module is less than pre-set threshold value for the signal level detecting when described noise reduction control module or in the time that the first switch unit is selected described convergent-divergent channel transfer digital signal described in the control of described noise reduction control module, control that the status lamp that arranges on described audio amplifier shows that volume is crossed mere suggestion and/or by this status information feedback to the main control system connecting with described audio amplifier, thereby point out input volume too small to user.
Seven of the improvement of technique scheme: each sound effect processor of described input processing module is arranged in described the first dsp processor, and described in each, each sound effect processor of output processing module is arranged in described the second dsp processor.
Eight of the improvement of technique scheme: each sound effect processor of described input processing module and described in each filter of output processing module be arranged in described the first dsp processor, and described in each, all the other sound effect processors of output processing module are arranged in described the second dsp processor.
Compared with prior art, the beneficial effect of technical scheme that the present invention 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. are dispensed to each sound effect processor, improve thus the disposed of in its entirety ability of Digital audio process module, for user provides more reliably, audio processing response fast.
In addition, the improvement project of this technology is the digital signal level size to DAC by noise reduction control module detected transmission also, when detecting signal level when too small, at DAC front end, the digital signal level that is transferred to DAC is amplified to certain multiple, and will dwindle with the multiple of former amplification through the analog signal level of DAC conversion output in the rear end of DAC, now the level of useful signal has returned to original level, and the background noise of DAC reduced several times, thereby reach the object of noise reduction.
Accompanying drawing explanation
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 (being provided with 2 EQ equalizers as example take input processing) of embodiment.
Figure 11 is the Digital audio process module sound effect processor distribution map (being provided with 3 EQ equalizers as example take input processing) 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 present invention, term " on ", D score, " left side ", " right side ", 'fornt', 'back', " top ", " end ", " interior ", " outward ", " in ", orientation or the position relationship of the indication such as " vertically ", " level ", " laterally ", " longitudinally " be based on orientation shown in the drawings or position relationship.These terms are mainly in order to describe better the present invention and embodiment, are not intended to limit indicated device, element or part and must have particular orientation, or construct and operate with particular orientation.
And above-mentioned part term is except can orientation or position relationship, being also used for representing other implications for representing, for example term " on " also may be used for representing in some cases certain relations of dependence or annexation.For those of ordinary skills, can understand as the case may be these terms concrete meaning in the present invention.
In addition, term " installation ", " setting ", " being provided with ", " connection ", " being connected " should be interpreted broadly.For example, can be to be fixedly connected with, removably connect, or monolithic construction; Can be mechanical connection, or electrical connection; Can be to be directly connected, or indirectly be connected by intermediary, or be connection inner between two devices, element or parts.For those of ordinary skills, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In addition, term " first ", " second " etc. are mainly used for distinguishing different devices, element or part (concrete kind is identical with structure possibility also may be different), not for showing or imply relative importance and the quantity of indicated device, element or part.Except as otherwise noted, the implication of " multiple " is two or more.
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is further described.
As shown in Figure 1, the active integrated baffle box with multi-digital signal processor system of the present embodiment comprises according to signal and flows to the signal input module 10 that sets gradually, Digital audio process module 20, DAC54 ', output buffer module 50, power amplifier module 30, horn module 40, and audio amplifier control module 90 for above-mentioned one or more modules are controlled, described signal input module is for receiving the audio signal of the described audio amplifier of input and transferring to described Digital audio process module.If 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.After described horn module is amplified processing, transfer to described horn module through the audio signal of described Digital audio process module processing and be reduced into sound.
As shown in Figure 10, Figure 11, described Digital audio process module comprises input processing module and multiple output processing module, wherein, described input processing module comprises multiple sound effect processors of series connection, each sound effect processor is for carrying out corresponding kind signal processing operations according to the processing parameter setting to audio signal, wherein an initial sound effect processor receives the audio signal from described signal input module, and a last sound effect processor audio signal after treatment is divided into multichannel output audio signal and is transferred to a corresponding described output processing module; Each described output processing module comprises multiple sound effect processors of series connection, and an initial sound effect processor is filter, this filter is for receiving Yi corresponding to described output processing module road output audio signal, and Dui Gai mono-road output audio signal carries out filtering processing, thereby obtain the audio signal of default frequency range.
The described Digital audio process module that the present embodiment adopts comprises the multiple 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 the sound effect processor that described Digital audio process module input processing module and each output processing module comprise flows to and is dispensed in described multiple dsp processor by signal.
For realizing multilayer adjustable function, described input processing module comprises one or more sound effect processors, and have at least input processing module described in 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 the array layer sound effect processor of setting for each audio amplifier member unification of array group under audio amplifier, each array group comprises multiple audio amplifiers, and the parameter of corresponding array layer sound effect processor that belongs to the audio amplifier of same array group is identical.
In addition, can also be provided with the system layer sound effect processor that belongs to this kind of sound effect processor type for input processing module described in any sound effect processor, system layer sound effect processor is the unified system group layer sound effect processor of setting of each audio amplifier member for 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 corresponding system layer sound effect processor that belongs to the audio amplifier of same system group is identical.General an of sound box system need arrange a system group.Each sound effect processor series connection that described input processing module comprises.
As an example of EQ equilibrium example, input processing module being comprised to two or three these kind sound effect processors describes.
(1) two EQ equilibrium.As shown in figure 10, 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 carries out EQ equilibrium treatment for whose fixed EQ processing parameter of described audio amplifier self to audio signal for basis, and this array layer EQ equalizer is for carrying out EQ equilibrium treatment according to the unified EQ processing parameter of setting of each audio amplifier member for array group described in affiliated audio amplifier to audio signal.
(2) three EQ equilibriums.As shown in figure 11, 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 carries out EQ equilibrium treatment for whose fixed EQ processing parameter of described audio amplifier self to audio signal for basis, this array layer EQ equalizer is for carrying out EQ equilibrium treatment according to the EQ processing parameter of unifying for each audio amplifier member of array group described in affiliated audio amplifier to set to audio signal, this system layer EQ equalizer is for carrying out EQ equilibrium treatment according to the EQ processing parameter of unifying for each audio amplifier member of system group under described audio amplifier to set to audio signal.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, wherein: this input silencer is for carrying out silence switch processing to audio signal; This input gain device is for audio processing that audio signal is gained; This input time delay device is for carrying out delay process to audio signal; This input polarity controller is for carrying out Polarity Control to audio signal; This input air attenuation equalizer is for carrying out attenuation of air compensation deals to audio signal; This input EQ equalizer is for carrying out the balanced audio processing of EQ to audio signal; This input compression amplitude limiter is for compressing amplitude limiting processing to audio signal.
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 is used for receiving the corresponding road output audio signal of output processing module described in this, and Dui Gai mono-road output audio signal carries out filtering processing, thus obtain with output processing module described in this sound frequency range that matches of corresponding power amplifier unit;
This input silencer carries out silence switch processing for output processing module described in this is received to Yi road output audio signal;
This input gain device is for receiving the audio processing that gains of Yi road output audio signal to output processing module described in this;
This input time delay device carries out delay process for output processing module described in this is received to Yi road output audio signal;
This input polarity controller carries out Polarity Control for output processing module described in this is received to Yi road output audio signal;
This input air attenuation equalizer carries out attenuation of air compensation deals for output processing module described in this is received to Yi road output audio signal;
These input and output EQ equalizer carries out the balanced audio processing of EQ for output processing module described in this being received to Yi road output audio signal;
This input compression amplitude limiter compresses amplitude limiting processing for output processing module described in this is received to Yi road output audio signal; Each audio processing module series connection of described output processing module, comes a last sound effect processor and is connected with described power amplifier module 30.When output audio signal is 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 after power amplifier unit amplifies processing again, is reduced into sound finally by loudspeaker unit.
As previously mentioned, the sound effect processor (comprising the sound effect processor of input processing module and each output processing module) that described Digital audio process module comprises flows to and is dispensed in described multiple dsp processor by signal.In an embodiment, can take two kinds of modes to distribute these sound effect processors.In fact Digital audio process module of the present invention also can adopt three or three above dsp processors, but adopts two dsp processors to set forth explanation with Digital audio process module below for convenience.
(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 described in each, each sound effect processor of 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 described in each filter of output processing module be arranged in described the first dsp processor 21, and described in each, all the other sound effect processors of output processing module are arranged in described the second dsp processor 22.
In above-mentioned two kinds of sound effect processor allocative decisions, preferentially choose the first scheme.In addition, described first dsp processor 21 initial as described Digital audio process module also comprises signal routing module, and for receiving analog signal input channel and the digital signal input channel 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 in described digital signal input channel, be also provided with the sampling rate converter for digital signal sampling rate being mated to conversion, selected Yi road input signal is transferred to the described initial sound effect processor (being input silencer in figure) in described input processing module by described signal routing module.The sound effect processor that each output processing module is last---signal after treatment will be transferred to described the first unit for scaling by output compressor.
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 comprises the first unit for scaling 228.Described output buffer module 50 comprises the second unit for scaling 52 and cushions the first-level buffer unit 51 of filter processor for the analog signal that described DAC 54 ' conversion is exported.First-level buffer unit 51 can adopt active filter circuit to realize, first-level buffer unit 51 is except can cushioning DAC 54 ', can also adjust signal output level and output impedance, 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 54 ' 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 detecting is during lower than pre-set threshold value, control described the first unit for scaling 228 by preset multiple amplifying signal level, and control described the second unit for scaling 52 simultaneously and dwindle signal level by this preset multiple; When the signal level detecting is during higher than threshold values, control described the first unit for scaling 228 and described the second unit for scaling 52 is exported by original signal level.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 control by noise reduction control module Dui Mei road signal, in the time that noise reduction control module detects that the level of this road signal output is too low, control the reverse convergent-divergent (the former amplifies, and the latter dwindles) that the first unit for scaling in this road signalling channel and the second unit for scaling carry out identical multiple simultaneously.
That is to say, when the signal level of input audio amplifier is when too small, noise reduction control module 95 starts 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 signal level has been amplified 10 times by the first unit for scaling 228,52 of the second unit for scaling can correspondingly dwindle signal level 10 times.When incoming signal level is in tolerance interval, when background noise is not given prominence to or do not affect audio amplifier sound field effect, noise reduction control module 95 controls the first unit for scaling 228 and the second unit for scaling 52 maintains original signal level, does not change the level of signal.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 export by former level.
As shown in Figure 5, described noise reduction control module 95 comprises: signal level detection module 2271, the digital signal level of processing for detection of Digital audio process module 20; Noise reduction Executive Module 2272, be used for judging that described signal level detection module 2271 detects that whether level is lower than pre-set threshold value, if control described the first unit for scaling 228 by preset multiple amplifying signal level lower than threshold values, and control described the second unit for scaling 52 simultaneously and dwindle signal level by this preset multiple; If control described the first unit for scaling 228 and described the second unit for scaling 52 is exported by original signal level higher than threshold values.
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 54 ', and described convergent-divergent passage is provided with the first level unit for scaling 2282 for signal level being amplified by described preset multiple, do not change through the signal level of put-through channel transmission.
Described the first switch unit 2281 is connected with described noise reduction control module 95, for receiving the digital signal of processing through described Digital audio process module 20, and select by described put-through channel or described convergent-divergent passage extremely described DAC 54 ' of this digital data transmission according to the control signal of described noise reduction control module 95.The signal level detecting when noise reduction control module 95 during higher than pre-set threshold value, will be sent to the first switch unit 2281 control signal of selecting put-through channel transmission of digital signals, and the signal level of output is constant; The signal level detecting when noise reduction control module 95 is during lower than pre-set threshold value, to send to the first switch unit 2281 control signal of selecting convergent-divergent channel transfer digital signal, 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 for signal level being dwindled by described preset multiple, does not change through the signal level of put-through channel transmission.Second electrical level unit for scaling 522 can adopt resistor voltage divider circuit or discharge circuit to realize, especially while 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 54 ' output, and select by described put-through channel or described convergent-divergent passage extremely described power amplifier module 30 of this analog signal transmission according to the control signal of described noise reduction control module 95.The signal level detecting when noise reduction control module 95 during higher than pre-set threshold value, will be sent to the second switch unit 521 control signal of selecting put-through channel transmission of analogue signal, and the signal level of output is constant; The signal level detecting 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, especially while adopting resistor voltage divider circuit, for level and impedance that second electrical level unit for scaling 522 is exported are matched 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 after buffer cell adjustment again.
Described output buffer module 50 also comprises level 2 buffering unit 53, and described level 2 buffering unit 53 carries out buffered for the signal that described the second unit for scaling 52 is exported, 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 to mate with described power amplifier module 30.
As Fig. 5, shown in Fig. 6, described noise reduction control module 95 comprises noise reduction state feedback module 951, described noise reduction state feedback module 951 is less than pre-set threshold value for the signal level detecting when described noise reduction control module 95 or in the time that described noise reduction control module 95 is controlled described the first switch unit 2281 and selected described convergent-divergent channel transfer digital signal, control the status lamp 61 arranging on described audio amplifier show volume cross mere suggestion (as flicker or word show) and/or by this status information feedback to as described in the main control system that connects of audio amplifier (or be called control platform), thereby point out input volume too small to user.
As Fig. 6, shown in Fig. 7, described signal input module 10 comprises the analog input interface 11 for receiving simulated audio signal, for receiving the AES input interface 12 of AES digital audio and video signals, be used for the RJ45 input interface 13 of the digital audio and video signals (digital audio and video signals of AES or extended formatting) that receives 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 external control main frame by described RJ45 input interface 13, main control system is controlled 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, by 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 control main control system simultaneously, to realize, the audio amplifier of dispersed placement is concentrated to monitoring.The digital audio and video signals of inputting audio amplifier through AES input interface, RJ45 input interface 13 converts the form that can directly directly process for dsp processor to by 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, to carry out cascade between audio amplifier, facilitates user flexibility to build audio amplifier interconnection network.Consider that the built-in power amplifier module 30 of active audio amplifier needs heat radiation, audio amplifier inside is generally provided with radiator fan 64 and the temperature sensor for detection 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 obtains radiator fan 64 rotary speed informations by devices such as Mega8 62.
As Fig. 2, shown in Fig. 6 and Fig. 7, described audio amplifier control module 90 also comprises the first control module 91 for controlling described signal input module 10, described the first control module 91(is connected with described analog signal compression amplitude limiter and described digital audio transmitter) comprise and compress amplitude limit state feedback module (not shown), described compression amplitude limit state feedback module is in the time that described analog signal compression amplitude limiter starts compression or amplitude limit function, control the status lamp 61 arranging on described audio amplifier show volume cross mere suggestion (as flicker or word show) and/or by this status information feedback to as described in the main control system that connects of audio amplifier, thereby point out input volume excessive to user.
As Fig. 8, shown in Fig. 9, described analog signal compression amplitude limiter comprises that flowing to by signal the prime balance connecting 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 flow to successively connect active half-wave rectification block, logarithm operation amplification module, 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.
In addition, described audio amplifier control module 90 also comprise the second control module 92 for controlling described the first dsp processor 21, for controlling the 3rd control module 93 of described the second dsp processor 22 and for controlling the 4th control module 94 of 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 being connected with audio amplifier, or according to the instruction of main control system by 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 being connected with audio amplifier, or according to the instruction of main control system by the parameter feedback of sound effect processor in described the second dsp processor 22 to main control system.
Claims (9)
1. one kind has the active integrated baffle box of multi-digital signal processor system, comprise according to signal and flow to the signal input module setting gradually, Digital audio process module, DAC, output buffer module, power amplifier module, horn module, and audio amplifier control module for above-mentioned one or more modules are controlled, described signal input module is for receiving the audio signal of the described audio amplifier of input and transferring to described Digital audio process module, described Digital audio process module comprises the sound effect processor of multiple series connection, after described horn module is amplified processing, transfer to described horn module through the audio signal of described Digital audio process module processing and be reduced into sound, described Digital audio process module comprises input processing module and multiple output processing module, wherein, described input processing module comprises multiple sound effect processors of series connection, each sound effect processor is for carrying out corresponding kind signal processing operations according to the processing parameter setting to audio signal, wherein an initial sound effect processor receives the audio signal from described signal input module, a last sound effect processor audio signal after treatment is divided into multichannel output audio signal and is transferred to a corresponding described output processing module, each described output processing module comprises multiple sound effect processors of series connection, and an initial sound effect processor is filter, this filter is for receiving Yi corresponding to described output processing module road output audio signal, and Dui Gai mono-road output audio signal carries out filtering processing, thereby obtain the audio signal of default frequency range,
It is characterized in that:
Described Digital audio process module comprises the multiple dsp processors that flow to series connection by signal, an initial dsp processor is connected with described signal input module, a last dsp processor is connected with described power amplifier module, and described multiple sound effect processors flow to and are dispensed in described multiple dsp processor by signal.
2. the active integrated baffle box with 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 cushions the first-level buffer unit of filter processor for the analog signal that described DAC conversion is exported, described last dsp processor comprises the first unit for scaling, described audio amplifier control module comprises noise reduction control module, the digital signal of the described Digital audio process module processing of process 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 through described Digital audio process module processing, when the signal level detecting is during lower than pre-set threshold value, control described the first unit for scaling by preset multiple amplifying signal level, and control described the second unit for scaling simultaneously and dwindle signal level by this preset multiple; When the signal level detecting is during higher than threshold values, control described the first unit for scaling and described the second unit for scaling is exported by original signal level.
3. the active integrated baffle box with 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, described the first unit for scaling and described noise reduction control module are arranged in described the second dsp processor.
4. according to the active integrated baffle box with multi-digital signal processor system described in claim 2 or 3, 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 for signal level being amplified by described preset multiple;
Described the first switch unit is connected with described noise reduction control module, for receiving digital signal through described Digital audio process module processing, and select by described put-through channel or described convergent-divergent passage extremely described DAC of this digital data transmission according to the control signal of described noise reduction control module.
5. according to the active integrated baffle box with multi-digital signal processor system described in claim 2 or 3, it 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 for signal level being dwindled by described preset multiple;
Described the second switch unit is connected with described noise reduction control module, for receiving the analog signal of described DAC output, and select by described put-through channel or described convergent-divergent passage extremely described power amplifier module of this analog signal transmission according to the control signal of described noise reduction control module.
6. according to the active integrated baffle box with multi-digital signal processor system described in claim 2 or 3, it is characterized in that: described output buffer module also comprises level 2 buffering unit, described level 2 buffering unit carries out buffered for the signal that described the second unit for scaling is exported, and the signal after buffered is transferred to described power amplifier module.
7. according to the active integrated baffle box with multi-digital signal processor system described in claims 1 to 3 any one, it is characterized in that: described noise reduction control module comprises noise reduction state feedback module, described noise reduction state feedback module is less than pre-set threshold value for the signal level detecting when described noise reduction control module or in the time that the first switch unit is selected described convergent-divergent channel transfer digital signal described in the control of described noise reduction control module, control that the status lamp that arranges on described audio amplifier shows that volume is crossed mere suggestion and/or by this status information feedback to the main control system connecting with described audio amplifier, thereby point out input volume too small to user.
8. the active integrated baffle box with multi-digital signal processor system according to claim 3, it is characterized in that: each sound effect processor of described input processing module is arranged in described the first dsp processor, and described in each, each sound effect processor of output processing module is arranged in described the second dsp processor.
9. the active integrated baffle box with multi-digital signal processor system according to claim 3, it is characterized in that: each sound effect processor of described input processing module and described in each filter of output processing module be arranged in described the first dsp processor, and described in each, all the other sound effect processors of output processing module are arranged in described the second dsp processor.
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| CN201210594407.2A CN103916755A (en) | 2012-12-31 | 2012-12-31 | Active integrated sound box with multi-DSP (digital signal processor) system |
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| CN201210594407.2A CN103916755A (en) | 2012-12-31 | 2012-12-31 | Active integrated sound box with multi-DSP (digital signal processor) system |
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| US7042986B1 (en) * | 2002-09-12 | 2006-05-09 | Plantronics, Inc. | DSP-enabled amplified telephone with digital audio processing |
| US20110081026A1 (en) * | 2009-10-01 | 2011-04-07 | Qualcomm Incorporated | Suppressing noise in an audio signal |
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Application publication date: 20140709 |