CN201243266Y - Equilibrium processing device for frequency response characteristic of audio-frequency system based on DSP - Google Patents
Equilibrium processing device for frequency response characteristic of audio-frequency system based on DSP Download PDFInfo
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- CN201243266Y CN201243266Y CNU200820047855XU CN200820047855U CN201243266Y CN 201243266 Y CN201243266 Y CN 201243266Y CN U200820047855X U CNU200820047855X U CN U200820047855XU CN 200820047855 U CN200820047855 U CN 200820047855U CN 201243266 Y CN201243266 Y CN 201243266Y
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Abstract
The utility model discloses an audio system frequency response balancing treatment device based on DSP, which comprises a digital signal processor (DSP), and an analog/digital converter, a digital/analog converter and an external ROM which are connected with the DSP; the ROM stores the DSP program. The device can realize the balancing treatment for the audio system frequency response characteristic through the DSP and can obtain the accurate frequency system frequency response balancing and correction. The device can input/output analog audio signals and can also input/output I<2>S digital audio signals with left-right alignment format. The device can input/output the single-channel audio signals, and can also input/output multi-channel audio signals.
Description
Technical field
The utility model device relates to the electroacoustic techniques field, specifically is meant a kind of audion system Frequency Response equilibrium treatment device based on DSP.
Background technology
The Frequency Response of audion system is meant the response characteristic of audion system to each frequency component of sound signal, comprises amplitude-frequency characteristic and phase-frequency characteristic.Desirable amplitude-frequency characteristic should be that smooth, desirable phase-frequency characteristic should be linearity in passband in passband.But always there is certain frequency response distortion in actual audion system (as loud speaker), for improving the audion system performance, needs it is carried out corresponding equilibrium treatment.
Generally come the Frequency Response of balanced audion system in the practical application with Graphic equalizer, the kind of Graphic equalizer is more, but basic functional principle all is identical, (20Hz～20kHz) is divided into each independently frequency band with the full range band of sound signal by several or band pass filter that tens Q values are constant, each band pass filter is realized by corresponding circuit, the fixed center frequency that a correspondence is arranged, centre frequency is by the setting of 1～third-octave, can promote respectively or decay each frequency band as required in the application, gain adjustment range be generally ± 15dB, ± 12dB, ± 6dB.The corresponding push button of each centre frequency, upwards promotion is then promoted the signal of corresponding frequency band, promotes downwards then the signal of corresponding frequency band to be decayed.By each formed curve in push button position is exactly the equalizer curve of this equalizer, therefore just can change equalizer curve as long as adjust the position of each push button.Though this general Graphic equalizer can be very flexibly and easily the Frequency Response of audion system is carried out equilibrium treatment, actual mechanical process is very complicated.Because the equilibrium correction characteristic that obtains expecting need be adjusted simultaneously to each frequency band, adding nearby frequency bands can influence each other again, so need the patient and painstaking debugging of professional, and often to monitor just and can adjust with special equipments such as spectrum analyzers, otherwise not only fall flat, can make system's frequency response distortion even more serious on the contrary.In the system if comprise how the then essential consideration equipment of Graphic equalizer is placed, the connection of holding wire, the connection of power line etc., thereby make system become complicated, and increase cost.
If the equilibrium correction characteristic of the expectation of audion system is known, definite, for simplified system, the part of equalizer as audion system for example can be accomplished the circuit and the power amplification circuit of balanced low frequency characteristic on the same circuit board in the multimedia active loudspeaker case.At present equalizer is generally realized with analog circuit, and common have LC type, a simulaed inductance type.Because be analog circuit, thus precision is limited, easily affected by noise, consistency is bad.Particularly dumb, as long as the balanced characteristic of revising has small part to revise, just must the redesign circuit.
In recent years, along with the development of computer technology, Digital Signal Processing, also occur based on the equalizer of dsp software.This implementation method is to go up configuration corresponding signal process software at digital signal processing chip (DSP), has advantages such as good stability, precision height, high conformity, reliability height, flexibility are good.Particularly, only need to increase corresponding code and can realize equalization function, do not need to increase hardware cost digital audio system based on DSP.IIR at present commonly used or FIR realize required several or tens band pass filters that the Q value is constant of equalizer.The advantage that realizes band pass filter with IIR is that exponent number is low, and shortcoming is to be difficult to accomplish linear phase, and system's potentially unstable.The advantage that realizes band pass filter with FIR is the linear phase that is easy to do, system stability, and shortcoming is the exponent number height, particularly at low frequency, thereby operand is big.But no matter be that each band pass filter that IIR or FIR realize all can not be desirable, transition band must be arranged, will inevitably have influence on other sub-band when therefore certain sub-frequency bands being adjusted.
The utility model content
The purpose of this utility model is to overcome the prior art above shortcomings, a kind of audion system Frequency Response equilibrium treatment device based on DSP is provided, utilizes digital signal processor (Digital Signal Processor DSP) audion system Frequency Response equilibrium treatment.This device both can the treatment of simulated sound signal, also can handle digital audio signal, obtained accurate audion system frequency response isostatic correction characteristic, and system configuration is simple, and is easy to use, and cost is low.The utility model is achieved through the following technical solutions:
A kind of audion system Frequency Response equilibrium treatment device based on DSP, this device comprises the external ROM of DSP, A/D converter, D/A and storage DSP program, described A/D converter output links to each other with the signal input part of DSP, the signal output part of DSP links to each other with the D/A input, and DSP also carries out signal with external ROM and is connected.
In the said apparatus, also be provided with serial digital sound signal receiving port, this port is connected with the signal input part of DSP.
In the said apparatus, described A/D converter has one or more sound channel sound signal input interfaces, and described D/A has one or more sound channel sound signal output interfaces.
In the said apparatus, described serial digital sound signal is a left side/Right Aligns I of split tunnel or TDM
2The S form.
In the said apparatus, A/D converter is used for the analog audio conversion of signals of input is become the data format of DSP support, and system can directly receive digital audio signal by serial digital sound signal receiving port.The audio data that D/A is used for number format that DSP is handled well converts the output of analog audio signal to, if system directly export digital audio signal then this D/A can omit.The signal of input, output can be the voice signal of monophony, dual track or multichannel.DSP can receive from the serial digital sound signal of A/D converter or miscellaneous equipment transmission, and its form can be a left side/Right Aligns I of split tunnel or Time Division Multiplexing
2The S form.After DSP receives audio data, data are handled.
The software processes flow process of the utility model device comprises following steps:
(1) sets the equilibrium correction characteristic of expecting;
(2) according to corresponding FIR of equilibrium correction characteristics design or the IIR equalization filter expected;
(3) write the filter that the dsp software realization designs, compiled program is put into stored program ROM;
(4) this device is connected to system, operation DSP program is carried out equilibrium treatment to the audion system Frequency Response.
Compared with prior art, have following advantage: this device both can the treatment of simulated sound signal, also can handle digital audio signal, obtained accurate audion system frequency response isostatic correction characteristic, and system configuration is simple, and is easy to use, and cost is low.The utility model device can also utilize DSP to realize multiple algorithm easily and flexibly and algorithm is improved and upgrades, therefore the various functions that audion system can be needed realize by the DSP algorithm, and can be as required to its upgrading, thereby simplified system reduces cost.
Description of drawings
Fig. 1 is the structural representation of the utility model device;
Fig. 2 is 5.1 path surround sound Virtual reproducing system block diagrams;
Fig. 3 is the structural representation of the utility model device embodiment;
Fig. 4 is the loud speaker amplitude-frequency response figure of the utility model device embodiment;
Fig. 5 is the equalizer curve figure of the utility model device embodiment design;
Fig. 6 is the software processes flow chart of the utility model device embodiment.
Embodiment
Below in conjunction with drawings and Examples, the utility model device is described in further detail.
As shown in Figure 1, the hardware configuration of the utility model device mainly comprises digital signal processor (DSP), program memory ROM, A/D converter (A/D), D/A (D/A), can import, export analog audio signal and digital audio signal, if system only imports, exports I
2The S digital audio signal then inputs to DSP (as the I among Fig. 1 by serial digital sound signal receiving port
2The input of S digital audio signal).Equilibrium treatment to the audion system Frequency Response realizes that by dsp software compiled DSP program deposits in the program memory ROM.
The utility model device can be used for aspects such as TV, home theater, multimedia sound system, high-fidelity sound system, the interior sound system of car.
The application of embodiment multimedium virtual surround sound sound system
In multimedium virtual surround sound sound system, as shown in Figure 2,5.1 original path surround sound signals obtain L ', R ' two-way output signal later on through virtual processing, and two speaker playbacks in the place ahead of feeding then fictionalize similar 5.1 real path surrounding sound effects.But common multimedia speaker cell size is less, and its amplitude-frequency response characteristic is difficult to accomplish straight fully, and particularly low frequency is since 200～300Hz decay, and acoustical reproduction low frequency deficiency is felt in subjective meeting, thereby influences replaying effect.Can obviously improve auditory effect like this with L ', R ' two paths of signals earlier by the equilibrium treatment speaker playback of feeding again later on.
As shown in Figure 3, a slice DSP that adopts among the utility model device embodiment is the TAS3108 that Texas Instruments (TI) company produces, this processor data precision height (wherein data storage is that 48-bit, coefficient memory are 28-bit, parallel multiplication 76-bit), sample rate is supported 32kHz～192kHz, supports the I of 8 passages
2The input and output of S audio data, TI company provides the graphical development environment (GDE) supporting with this processor to write signal processing software, and hardware interface drivers need not the user and writes, and the assembly of existing graphicsization is for calling.This processor is its main operational parts of realizing audion system Frequency Response equilibrium treatment algorithm, adopt a slice FLASH (24LC512) as program storage, adopted 3 A/D chips (PCM1803) to receive the analog audio signal of 6 sound channels of 5.1 path surround sounds in the system, comprise left L, right R, a left side around LS, right around RS, mid-C, low-frequency effect LFE signal, per two sound channels convert 1 road I to by a slice A/D chip
2The audio data of S form sends to DSP, adopt Chinese invention patent application (title: a kind of 5.1 path virtual surround sound signal processing methods then, application number: 200610037495.0) described method converts thereof into two path virtual surround sound signal L ', behind the R ', respectively to L ', R ' signal carries out equilibrium treatment again.
Writing of DSP equilibrium treatment software may further comprise the steps:
(1) its Frequency Response is calculated in the impulse response of loud speaker before the measurement equilibrium treatment;
(2) Frequency Response with loud speaker Frequency Response and expectation compares, and draws the value that each frequency band need be revised;
(3) correction value according to each frequency band designs corresponding iir filter;
(4) the language compilation dsp software of supporting with DSP is realized the iir filter that designs.Compiled DSP procedure stores is in FLASH, and the program among the back FLASH that powers on is directed into the internal RAM operation of DSP.The data that DSP handles well form 1 road I
2The S signal becomes 2 road analog audio signals through a slice D/A chip (PCM1754) and outputs to two loud speakers repeating transmission.
Curve A shown in Figure 4 is the amplitude-frequency response of certain model miniature loudspeaker, and low frequency 240Hz begins to descend, subjective audition sensation acoustical reproduction low frequency deficiency.Curve B is the main expectation Frequency Response that obtains by subjective assessment.
Shown in Figure 5 is the equalizer curve of design.Draw the value that each frequency band need be revised after two curves of A, B of Fig. 4 are compared, the Filter Creation Tool that uses graphical development environment (GDE) to carry designs equalizer curve according to correction value, on the basis of subjective audition experiment, equalizer curve is carried out fine tuning on Frequency Response Graph interface then, obtain the better equalizer curve of subjective hearing effect at last than expectation.
Shown in Figure 6, the back DSP that powers on finishes the initialization setting, starts the correlating markings position then and makes DSP can receive the input data, receives upper layer commands, sends dateout.DSP does virtual sonication to it earlier after receiving the signal of 6 sound channels, obtain the dateout of two sound channels, data to these two sound channels are carried out Filtering Processing respectively with the iir filter coefficient, can realize the Frequency Response of left and right loud speaker is carried out equilibrium correction.The research of the utility model device obtains the subsidy of " Guangzhou plan of science and technology project, numbering: 2005Z3-D0071 ".
Claims (4)
1, a kind of audion system Frequency Response equilibrium treatment device based on DSP, it is characterized in that comprising the external ROM of DSP, A/D converter, D/A and storage DSP program, described A/D converter output links to each other with the signal input part of DSP, the signal output part of DSP links to each other with the D/A input, and DSP also carries out signal with described external ROM and is connected.
2, the audion system Frequency Response equilibrium treatment device based on DSP as claimed in claim 1 is characterized in that also being provided with serial digital sound signal receiving port, and this port is connected with the signal input part of DSP.
3, the audion system Frequency Response equilibrium treatment device based on DSP as claimed in claim 2, it is characterized in that described A/D converter has one or more sound channel sound signal input interfaces, described D/A has one or more sound channel sound signal output interfaces.
4, the audion system Frequency Response equilibrium treatment device based on DSP as claimed in claim 3 is characterized in that described serial digital sound signal is a left side/Right Aligns I of split tunnel or TDM
2The S form.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU200820047855XU CN201243266Y (en) | 2008-05-16 | 2008-05-16 | Equilibrium processing device for frequency response characteristic of audio-frequency system based on DSP |
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| CNU200820047855XU CN201243266Y (en) | 2008-05-16 | 2008-05-16 | Equilibrium processing device for frequency response characteristic of audio-frequency system based on DSP |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447446A (en) * | 2011-12-09 | 2012-05-09 | 苏州上声电子有限公司 | Balancing method and device of speaker frequency response fed back based on vibration element motion state |
| CN107481727A (en) * | 2017-06-23 | 2017-12-15 | 罗时志 | A kind of acoustic signal processing method and system based on the control of electric sound keynote |
| CN110749763A (en) * | 2019-12-24 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | Triggering method based on I2S signal and oscilloscope |
-
2008
- 2008-05-16 CN CNU200820047855XU patent/CN201243266Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447446A (en) * | 2011-12-09 | 2012-05-09 | 苏州上声电子有限公司 | Balancing method and device of speaker frequency response fed back based on vibration element motion state |
| CN107481727A (en) * | 2017-06-23 | 2017-12-15 | 罗时志 | A kind of acoustic signal processing method and system based on the control of electric sound keynote |
| CN107481727B (en) * | 2017-06-23 | 2020-05-29 | 罗时志 | Audio signal processing method and system based on electric tone pitch control |
| CN110749763A (en) * | 2019-12-24 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | Triggering method based on I2S signal and oscilloscope |
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Granted publication date: 20090520 |
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