CN201789629U - Squeal restraining device and sound amplifying system - Google Patents
Squeal restraining device and sound amplifying system Download PDFInfo
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- CN201789629U CN201789629U CN201020523693XU CN201020523693U CN201789629U CN 201789629 U CN201789629 U CN 201789629U CN 201020523693X U CN201020523693X U CN 201020523693XU CN 201020523693 U CN201020523693 U CN 201020523693U CN 201789629 U CN201789629 U CN 201789629U
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Abstract
The utility model discloses a squeal restraining device and a sound amplifying system, wherein the squeal restraining device comprises an A/D (Analog to Digital) converter used for converting an analog sound signal into a digital sound signal, a delay processor used for carrying out millisecond-level delay processing on the digital sound signal, a D/A (Digital to Analog) converter for converting the digital sound signal into the analog sound signal and a low-frequency modulator which is used for carrying out low-frequency modulation on the delayed digital sound signal, the wherein the A/D converter, the delay processor and the D/A converter are connected in sequence, and the low-frequency modulator is connected with the delay processor. By applying the utility model, a mode that the millisecond-level delay processing is firstly carried out on a voice signal and then the low-frequency modulation is carried out can be adopted to make all frequency components in the voice signal changed unceasingly, i.e. the steady-state condition for establishing squeal frequency points is broken, thereby achieving the goal of restraining squeals and ensuring the output voice quality.
Description
Technical field
The utility model relates to a kind of restraining device and use the sound reinforcement system of this device of uttering long and high-pitched sounds.
Background technology
In applied various types of sound reinforcement systems such as public entertainment occasion, the multi-functional conference hall of enterprises and institutions and theatrical performances occasion, if the microphone volume is carried out bigger lifting, the sound that audio amplifier sends will pass to microphone and cause and utter long and high-pitched sounds that this phenomenon is exactly acoustic feedback.Acoustic feedback not only destroyed tonequality, limited the expansion volume of microphone sound, make the sound that microphone picks up can not well reproduced, and the acoustic feedback of the degree of depth also can make system signal strong excessively, thereby burn power amplifier or audio amplifier (being the high pitch head that burns audio amplifier generally speaking), cause damage.So in a single day the acoustic feedback phenomenon appears in sound reinforcement system, must prevent by every means, otherwise, not only bringing inconvenience to the user, also can cause damage to sound reinforcement system.The main cause of sound reinforcement system generation acoustic feedback phenomenon is that the frequency of some sound in the voice signal is strong excessively, if these voice signals of crossing strong frequency are decayed, just can avoid the generation of acoustic feedback phenomenon.
Traditional feedback suppressor of uttering long and high-pitched sounds has following 3 kinds of suppressor modes:
1) shift frequency (phase shift) mode: form the shift frequency circuit with resistance, electric capacity and active device signal is carried out the shift frequency processing, final destruction is uttered long and high-pitched sounds and is fed back the condition that forms after the frequency shift, reaches the purpose of the inhibition of uttering long and high-pitched sounds; Be characterized in that circuit is simple, cost is low, but DeGrain, the inhibition poor ability of uttering long and high-pitched sounds;
2) equalizer is adjusted mode: the frequency of the correspondence that suppresses uttering long and high-pitched sounds with Graphic equalizer or parametric equalizer decays, thereby reaches the purpose of uttering long and high-pitched sounds and suppressing; This mode characteristics be that complicated operation, operate miss are big, cost is not low yet, is difficult to the inhibition effect of uttering long and high-pitched sounds that reaches good in actual the use;
3) adopt the digital feedback suppressor of uttering long and high-pitched sounds automatically of specialty: equipment selects into, and effect is obvious, talks about the degree height automatically, but it is very expensive, all seldom uses except that non-large-scaled regular public address requires.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of restraining device of uttering long and high-pitched sounds, and can effectively suppress the generation of uttering long and high-pitched sounds, and does not influence the voice quality of output;
Another technical problem to be solved in the utility model is to provide a kind of sound reinforcement system, can not produce when voice output and utter long and high-pitched sounds.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of restraining device of uttering long and high-pitched sounds comprises:
Be used for analoging sound signal convert to digital audio signal A/D converter,
To digital audio signal carry out the Millisecond delay process the delay process device,
With digital audio signal convert to analoging sound signal output D/A converter and
Be used for the digital audio signal of time-delay is carried out the low frequency modulations device of low frequency modulation;
Wherein, described A/D converter, delay process device, D/A converter are linked in sequence, and described low frequency modulations device is connected with the delay process device.
Wherein, described delay process device adopts dsp processor or the time-delay special chip with the time-delay algorithm that generates based on above-mentioned model, and described time-delay special chip comprises M6583 chip, ES56028 chip etc.
A kind of sound reinforcement system comprises microphone and loud speaker, also comprises the restraining device of uttering long and high-pitched sounds, and this restraining device of uttering long and high-pitched sounds comprises:
Be used for analoging sound signal convert to digital audio signal A/D converter,
To digital audio signal carry out the Millisecond delay process the delay process device,
With digital audio signal convert to analoging sound signal output D/A converter and
Be used for the digital audio signal of time-delay is carried out the low frequency modulations device of low frequency modulation;
Described A/D converter, delay process device, D/A converter are linked in sequence, and described low frequency modulations device is connected with the delay process device; And the signal input part of described A/D converter is connected with microphone, and the signal output part of D/A converter is connected with loud speaker.
Wherein, described delay process device adopts dsp processor or the time-delay special chip with the time-delay algorithm that generates based on above-mentioned model, and described time-delay special chip comprises M6583 chip, ES56028 chip etc.
The beneficial effects of the utility model are:
Use the utility model, can adopt the delay process that voice signal is carried out Millisecond earlier to carry out mode that low frequency transfers again and make that all frequency contents all ceaselessly are changed in the voice signal, promptly break the limit that the Frequency point of uttering long and high-pitched sounds is set up, thereby reached the purpose that effective inhibition is uttered long and high-pitched sounds;
In addition, because the delay process result of Millisecond only is equivalent to point source of sound has been moved several meters (the aerial propagation velocity of sound is 340 meter per seconds), to almost not influence of voice output, and the low frequency modulation system that is adopted is very little to the tonequality influence of voice public address, so the utility model not only effectively suppresses to utter long and high-pitched sounds and has also guaranteed the voice quality of output.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
The restraining device structure chart of uttering long and high-pitched sounds that Fig. 1 provides for the utility model embodiment.
The sound reinforcement system structure chart that Fig. 2 provides for the utility model embodiment.
Embodiment
See also Fig. 1, the restraining device of uttering long and high-pitched sounds that the utility model embodiment provides comprises: the A/D converter that is linked in sequence, delay process device and D/A converter, and the low frequency modulations device that is connected with the delay process device;
Wherein, A/D converter is used to receive analoging sound signal and converts analoging sound signal to digital audio signal; The delay process device is used for digital audio signal is carried out the delay process of Millisecond; D/A converter is used for converting digital audio signal to analoging sound signal and output; The low frequency modulations device is used for the digital audio signal of time-delay is carried out the low frequency modulation.Described delay process device can adopt dsp processor (having the algorithm that generates based on above-mentioned model), also can adopt time-delay application-specific integrated circuit (for example M65831, ES56028 etc.).
Because the generation of uttering long and high-pitched sounds must possess stable condition, this limit is meant: (have and produce the possibility of uttering long and high-pitched sounds when sound reinforcement system produces critical uttering long and high-pitched sounds at certain Frequency point, but the state of not uttering long and high-pitched sounds as yet), there is the triggering of certain factor to cause uttering long and high-pitched sounds and begins to produce, this moment, as long as this conditional stability does not change, it was just more and more stronger to utter long and high-pitched sounds if the sound of loudspeaker is passed microphone once more back, thereby the utility model adopt to destroy the generation that the mode of the stable condition that produces of uttering long and high-pitched sounds suppresses to utter long and high-pitched sounds, and its operation principle is specially:
At first, the analoging sound signal of input is after A/D converter converts digital audio signal to, and the delay process device carries out the delay process of Millisecond to this digital audio signal; The influence of this process only is equivalent to point source of sound and has moved several meters (the aerial propagation velocity of sound is 340 meter per seconds), so delay process is to the almost not influence of voice quality of final output.
Then, digital audio signal to this time-delay carries out low-frequency modulation (the about 0.1-0.5Hz of the modulating frequency of low frequency), such result is that frequency contents all in the signal all ceaselessly is being changed, also just break the limit that the Frequency point of uttering long and high-pitched sounds is set up, and this mode is all effective to the change of all possible Frequency point of uttering long and high-pitched sounds, thereby can reach the inhibition effect of significantly uttering long and high-pitched sounds.Owing to be very low-frequency modulation, this mode is very little to the tonequality influence of voice public address.
At last, the digital audio signal after the modulation after converting analoging sound signal to, is exported D/A converter.
In above-mentioned processing procedure, though choose big more modulating frequency F and modulation amplitude D, the inhibition ability of uttering long and high-pitched sounds of restraining device of uttering long and high-pitched sounds can be strong more, but the negative effect meeting to sense of hearing is serious more, thereby need choose the modulation amplitude D and the modulating frequency F of suitable low frequency, wherein, the scope of choosing of suitable low frequency modulations amplitude D is 1mS～10mS, and the scope of choosing of suitable low frequency modulations frequency F is 0.1Hz-0.5Hz.
See also Fig. 2, the sound reinforcement system that the utility model embodiment provides comprises: microphone, the restraining device of uttering long and high-pitched sounds, loud speaker; Wherein, the structure of the restraining device of uttering long and high-pitched sounds as shown in Figure 1, the signal input part of its A/D converter is connected with microphone, the signal output part of its D/A converter is connected with loud speaker.
Its operation principle is: the analoging sound signal through the microphone collection inputs to the restraining device of uttering long and high-pitched sounds, and the output analoging sound signal is to loud speaker after the restraining device of uttering long and high-pitched sounds carries out analog-to-digital conversion, time-delay, modulation, digital-to-analogue conversion processing.
In sum, the utility model has realized that under the prerequisite of nondestructive voice quality implementation method is simply effective to effective inhibition of uttering long and high-pitched sounds.
Above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, only with reference to preferred embodiment the utility model is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical solution of the utility model, and do not break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (6)
1. the restraining device of uttering long and high-pitched sounds is characterized in that, comprising:
Be used for analoging sound signal convert to digital audio signal A/D converter,
To digital audio signal carry out the Millisecond delay process the delay process device,
With digital audio signal convert to analoging sound signal output D/A converter and
Be used for the digital audio signal of time-delay is carried out the low frequency modulations device of low frequency modulation;
Wherein, described A/D converter, delay process device, D/A converter are linked in sequence, and described low frequency modulations device is connected with the delay process device.
2. the restraining device of uttering long and high-pitched sounds as claimed in claim 1 is characterized in that, described delay process device adopts dsp processor or time-delay special chip.
3. the restraining device of uttering long and high-pitched sounds as claimed in claim 2 is characterized in that, described time-delay special chip comprises M6583 chip and ES56028 chip.
4. a sound reinforcement system comprises microphone and loud speaker, it is characterized in that, also comprises the restraining device of uttering long and high-pitched sounds, and this restraining device of uttering long and high-pitched sounds comprises:
Be used for analoging sound signal convert to digital audio signal A/D converter,
To digital audio signal carry out the Millisecond delay process the delay process device,
With digital audio signal convert to analoging sound signal output D/A converter and
Be used for the digital audio signal of time-delay is carried out the low frequency modulations device of low frequency modulation;
Described A/D converter, delay process device, D/A converter are linked in sequence, and described low frequency modulations device is connected with the delay process device; And the signal input part of described A/D converter is connected with microphone, and the signal output part of D/A converter is connected with loud speaker.
5. sound reinforcement system as claimed in claim 4 is characterized in that, described delay process device adopts dsp processor or time-delay special chip.
6. sound reinforcement system as claimed in claim 5 is characterized in that, described time-delay special chip comprises M6583 and ES56028 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020523693XU CN201789629U (en) | 2010-09-08 | 2010-09-08 | Squeal restraining device and sound amplifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020523693XU CN201789629U (en) | 2010-09-08 | 2010-09-08 | Squeal restraining device and sound amplifying system |
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| Publication Number | Publication Date |
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| CN201789629U true CN201789629U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020523693XU Expired - Lifetime CN201789629U (en) | 2010-09-08 | 2010-09-08 | Squeal restraining device and sound amplifying system |
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| CN (1) | CN201789629U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653038A (en) * | 2016-09-09 | 2017-05-10 | 深圳来邦科技有限公司 | Sound amplifying system |
| CN110191398A (en) * | 2019-05-17 | 2019-08-30 | 深圳市湾区通信技术有限公司 | Suppressing method, device and the computer readable storage medium uttered long and high-pitched sounds |
-
2010
- 2010-09-08 CN CN201020523693XU patent/CN201789629U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653038A (en) * | 2016-09-09 | 2017-05-10 | 深圳来邦科技有限公司 | Sound amplifying system |
| CN110191398A (en) * | 2019-05-17 | 2019-08-30 | 深圳市湾区通信技术有限公司 | Suppressing method, device and the computer readable storage medium uttered long and high-pitched sounds |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU YANGCHENG PRECISION ELECTRONIC CO., LTD. Effective date: 20120917 Owner name: GUOGUANG ELECTRIC CO., LTD. Free format text: FORMER OWNER: GUANGZHOU AIVIN AUDIO CO., LTD. Effective date: 20120917 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120917 Address after: 510800 Guangzhou street, Xinhua Street, Huadu District, Guangdong, China, No. 8, Jinghu Patentee after: Guoguang Electric Co., Ltd. Patentee after: Guangzhou Yangcheng Precision Electronics Co., Ltd. Patentee after: Wuzhou Hengsheng Electronic Technology Co., Ltd. Address before: 510800 Guangzhou street, Xinhua Street, Huadu District, Guangdong, China, No. 8, Jinghu Patentee before: Guangzhou Aiwei Sound Equipment Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110406 |
|
| CX01 | Expiry of patent term |