CN104080025A - Loudspeaker system and low frequency control method of loudspeaker system - Google Patents
Loudspeaker system and low frequency control method of loudspeaker system Download PDFInfo
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- CN104080025A CN104080025A CN201410359567.8A CN201410359567A CN104080025A CN 104080025 A CN104080025 A CN 104080025A CN 201410359567 A CN201410359567 A CN 201410359567A CN 104080025 A CN104080025 A CN 104080025A
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Abstract
The invention discloses a loudspeaker system and a low frequency control method of the loudspeaker system. The loudspeaker system includes a DSP control module, at least one first loudspeaker and at least one second loudspeaker. According to the invention, the DSP control module is used for receiving sound signals of an external device and transmitting the sound signals to a first sound signal path and a second sound signal path, processing the first sound signal, duplicating and sending the processed signal to the second sound signal path, then sending the first sound signal to the first loudspeaker and the second sound signal to the second loudspeaker respectively. After processing of the DSP control module, to a certain extent, sound wave phase positions of two loudspeaker arrays where no sound is required are counteracted, and sound wave phase positions of two loudspeaker arrays where sound is required are superposed.
Description
Technical field
The present invention relates to the control method of a kind of speaker system and speaker system low frequency.
Background technology
The medium and low frequency sound wave of loud speaker is because its wavelength has surmounted the size of former loud speaker greatly, and so just having caused low-frequency sound wave direction in the time of radiation is that 360 degree are nondirectional.Below can cause undoubtedly the place that need to obtain sound to obtain sound, and not need the place of sound also to have sound, cause harmful radiation and the leakage of sound wave.
Summary of the invention
The object of this invention is to provide the control method of a kind of speaker system and speaker system low frequency.
According to an aspect of the present invention, provide a kind of speaker system, comprised DSP control module, at least one first loud speaker and at least one the second loud speaker, wherein,
DSP control module receives the audio signal that external device (ED) sends, DSP control module sends to audio signal the first audio signal channel of DSP control module, after processing and copy by DSP control module, send to the second audio signal channel of DSP control module, DSP control module is processed the second audio signal
The first loud speaker receives the first audio signal that the first audio signal channel sends, and the second loud speaker receives the second audio signal that the second audio signal channel sends, and the sounding face of the sounding face of the first loud speaker and the second loud speaker in opposite directions.
In some embodiments, the first loud speaker can have five, and five the first loud speakers are longitudinally arranged, and the second loud speaker can have five, and five the second loud speakers are longitudinally arranged, and the first loud speaker is located at a side of the second loud speaker.Thus, after processing through DSP control module, each the first loud speaker parameters,acoustic is consistent, and the second loud speaker and the first loud speaker have close parameters,acoustic.
In some embodiments, can also comprise the first power amplifier module and the second power amplifier module, the first loud speaker is by the first power amplifier module, receive the first audio signal that the first audio signal channel sends, the second loud speaker, by the second power amplifier module, receives the second audio signal that the second audio signal channel sends.Thus, power amplifier module can amplify audio signal, and after the audio signal after amplifying is sent to loud speaker, loud speaker is realized public address.
In some embodiments, can also comprise the first acoustic pressure measurement module, the second acoustic pressure measurement module and receiver module, the first acoustic pressure measurement module is located at the first loud speaker sounding face one side, the first acoustic pressure measurement module receives the sound pressure signal that the first loud speaker and the second loud speaker send, and sound pressure signal is sent to receiver module, the second acoustic pressure measurement module is located at the second loud speaker sounding face one side, the second acoustic pressure measurement module receives the sound pressure signal that the first loud speaker and the second loud speaker send, and sound pressure signal is sent to receiver module.Thus, by the first acoustic pressure measurement module and the second acoustic pressure measurement module, the sound pressure signal that the first loud speaker and the second loud speaker can be sent sends to receiver module.
In some embodiments, can also comprise display module and key-press module, receiver module sends to display module to show sound pressure signal, key-press module receives the push button signalling of outside human body and push button signalling is sent to DSP control module, and DSP control module is processed the first audio signal and the second audio signal.Thus, display module demonstrates acoustic pressure, allows user can see intuitively the size of acoustic pressure, thereby adjusts DSP control module by key-press module, and acoustic pressure and the frequency of DSP control module control the first audio signal and the second audio signal change.
In some embodiments, the first acoustic pressure measurement module can be MIC (microphone).Thus, MIC (microphone) can receive sound pressure signal, and sound pressure signal is sent to receiver module.
According to another aspect of the present invention, provide a kind of control method of speaker system low frequency, having comprised:
A) DSP control module receives the audio signal that external device (ED) sends,
B) DSP control module sends to audio signal the first audio signal channel of DSP control module,
C) DSP control module is processed and is copied the first audio signal in the first audio signal channel,
D) the first audio signal copying is sent to the second audio signal channel by DSP control module,
E) DSP control module is according to the sound source distance of the first loud speaker and the second loud speaker and required counteracting frequency, determine time delay required between the first loud speaker and the second loud speaker and corresponding acoustic pressure relation, the compensation of the second audio signal time delay, frequency and the acoustic pressure of DSP control module control the second audio signal channel, and by the pole reversal of the second audio signal
F) the first audio signal is sent to the first loud speaker by DSP control module, and the second audio signal is sent to the second loud speaker by DSP control module.
In some embodiments, can also comprise: g) DSP control module sends to the first loud speaker by the first power amplifier module by the first audio signal, DSP control module sends to the second loud speaker by the second power amplifier module by the second audio signal,
H) the first acoustic pressure measurement module receives the sound pressure signal that the first loud speaker and the second loud speaker send, and sound pressure signal is sent to receiver module, the second acoustic pressure measurement module receives the sound pressure signal that the first loud speaker and the second loud speaker send, and acoustic pressure is sent to receiver module.
In some embodiments, can also comprise: h) receiver module sends to display module to show sound pressure signal, and key-press module receives outside push button signalling and push button signalling is sent to DSP control module.
In the present invention, DSP control module receives the audio signal of external device (ED), audio signal is sent to the first audio signal channel and the second audio signal channel, DSP control module sends to the second audio signal channel by the first Audio Signal Processing and after copying, afterwards, respectively the first audio signal is sent to the first loud speaker, the second audio signal sends to the second loud speaker, through the processing of DSP control module, make to a certain extent, the sound wave phase cancellation that does not need the place two row loudspeaker arrays of sound to send, the sound wave Phase Stacking that needs the place two row loudspeaker arrays of sound to send, reduce the radiation of sound.
Brief description of the drawings
Fig. 1 is the structural representation of the speaker system of one embodiment of the present invention;
Fig. 2 is the schematic diagram of speaker system shown in Fig. 1;
Fig. 3 is the flow chart of speaker system shown in Fig. 1;
Fig. 4 is the flow chart of speaker system debug process shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 has schematically shown according to the structure of the speaker system of one embodiment of the present invention.
Fig. 2 schematically shows the principle of speaker system shown in Fig. 1.
As depicted in figs. 1 and 2, a kind of speaker system, comprises DSP control module 1, the first loud speaker 21 and the second loud speaker 22.In addition, this speaker system also comprises the first acoustic pressure measurement module 31, the second acoustic pressure measurement module 32, receiver module 4, the first power amplifier module 51, the second power amplifier module 52, display module 6 and key-press module 7.
As shown in Figure 1, in the present embodiment, the first loud speaker 21 and the second loud speaker 22 all have five (can be also one, two, four, seven), and the first loud speaker 21 and the second loud speaker 22 are as shown in Figure 1 longitudinally staggered.Or, the first loud speaker 21 and the second loud speaker 22 also can have other arrangement mode, but no matter in which kind of mode arrange, all need to meet following condition: the lateral separation of the first loud speaker 21 and the second loud speaker 22 should be less than the half-wavelength (drawing according to Principles of Acoustics) of the highest frequency of required counteracting sound wave, and in the first loud speaker 21 and the second loud speaker 22, the distance of the sounding face of the loud speaker of arbitrary neighborhood should be less than the half-wavelength (drawing according to Principles of Acoustics) of the highest frequency of required use sound wave.
DSP control module 1 is a module that signal is represented with digital form and process.
DSP control module 1 is fixed on the first loud speaker 21 or on the second loud speaker 22, and as shown in Figure 3, DSP control module 1 receives the audio signal that external device (ED) (such as music player, PC etc. can send the device of audio signal) sends.Audio signal is sent to the first audio signal channel by DSP control module 1, DSP control module 1 is carried out acoustics compensation and correcting process to the first audio signal in the first audio signal channel, and (acoustics compensates and the object of correcting process is frequency and the acoustic pressure in order to adjust audio signal, while making the first audio signal send to multiple the first loud speaker 21 by the first power amplifier module 51, audio signal in each the first loud speaker 21 is identical), afterwards, the first audio signal after DSP control module 1 replication processes, again the first audio signal copying is sent to the second audio signal channel.
DSP control module 1, according on the first loud speaker 21 and the sound source distance of the second loud speaker 22 and required counteracting frequency, is determined the time delay that the second audio signal is required.DSP control module 1 transmits control signal to the second audio signal channel, the second audio signal compensation of delay, frequency compensation and the acoustic pressure compensation deals of control signal control the second audio signal channel.
On above-described the first loud speaker 21 and the sound source distance of the second loud speaker 22 can obtain by measurement, measure by Principles of Acoustics the sound wave that sends with the second loud speaker 22 on the first loud speaker 21 and obtain its distance to the time of regulation point.
DSP control module 1 is by the pole reversal (that is to say, the phase angle of the sound wave that the phase angle of the sound wave that the second loud speaker 22 sends and the first loud speaker 21 send differs 180 degree) through above-mentioned the second audio signal after treatment.
The first power amplifier module 51 is electrically connected with the first audio signal channel, receive in the first audio signal channel the first audio signal after treatment and send it to the first loud speaker 21, the second power amplifier module 52 is electrically connected with the second audio signal channel, receives in the second audio signal channel after above-mentioned processing the second audio signal and sends it to the second loud speaker 22.The first loud speaker 21 and the second loud speaker 22 are sounded.
Due to likely same loud speaker not of the first loud speaker 21 and the second loud speaker 22, its transient state characteristic can have greatly changed, will be inaccurate so only go to carry out the setting of time delay by the sound source distance between two row loudspeaker arrays.In order to ensure that sound that the first loud speaker 21 and the second loud speaker 22 send is in acoustic pressure, frequency and phase place can meet the condition of acoustics Phase Stacking and phase cancellation, need acoustic pressure and the frequency of the first audio signal and the second audio signal to compensate, and DSP control module 1 only relies on the first loud speaker 21 calculating and the sound source distance of the second loud speaker 22, acoustic pressure to the second audio signal and frequency compensate and can have error, in order to make the sound that the first loud speaker 21 and the second loud speaker 22 send can be need the place stack of sound and do not need the place of sound to offset can be more accurate, need to increase a debug process, this debug process need to increase with lower device and equipment, increase by the first acoustic pressure measurement module 31, the second acoustic pressure measurement module 32, receiver module 4, display module 6 and key-press module 7.
Can utilize the first acoustic pressure measurement module 31, the second acoustic pressure measurement module 32 is measured the mode of acoustic pressure the data of DSP control module 1 is debugged, process is as follows: in the present embodiment, place the first acoustic pressure measurement module 31 in the sounding face direction of the first loud speaker 21, place mutually the second acoustic pressure measurement module 32 in the sounding face method of the second loud speaker 22, the first acoustic pressure measurement module 31 is electrically connected with receiver module 4, the second acoustic pressure measurement module 32 is electrically connected with receiver module 4, the first acoustic pressure measurement module 31 and the second acoustic pressure measurement module 32 all receive the mixing sound pressure signal that the first loud speaker 31 and the second loud speaker 22 send, and sound pressure signal is sent to receiver module 4, receiver module 4 sends to display module 6 to show sound pressure signal.
According to the acoustic pressure showing, user adjusts DSP control module 1 by key-press module 7, the audio signal parameters (acoustic pressure and frequency) of DSP control module 1 to the first audio signal and the second audio signal finely tuned, make the first loud speaker 21 and the second loud speaker 22 reach desirable state, do not need the sound wave phase cancellation of place two row loudspeaker arrays of sound, and needing place first loud speaker 21 of sound and the sound wave Phase Stacking of the second loud speaker 22 can be more accurate.In other embodiments, also can only place the first acoustic pressure measurement module 31 or only place the second acoustic pressure measurement module 32 in the sounding face direction of the second loud speaker 22 in the sounding face direction of the first loud speaker 21.
In the present embodiment, the first acoustic pressure measurement module 31 and the second acoustic pressure measurement module 32 all adopt MIC (that is: microphone), in other embodiments, the first acoustic pressure measurement module 3 and the second acoustic pressure measurement module can also adopt other device that can respond to sound pressure signal or equipment.
Fig. 3 schematically shows the flow process of the control method of speaker system low frequency.
The flow process of the control method of speaker system low frequency is as follows:
Step 101, external device (ED) (as music player, PC etc. can send the device of audio signal) sends audio signal;
Step 102, the audio signal channel received audio signal of DSP control module 1, and audio signal is sent to the first signal passage of DSP control module 1;
Step 103, DSP control module 1 is carried out acoustics compensation and correcting process to the first audio signal of the first audio signal channel, and (acoustics compensates and the object of correcting process is frequency and the wavelength in order to adjust audio signal, while making the first audio signal send to multiple the first loud speaker 21 by the first power amplifier module 51, the audio signal in each the first loud speaker 21 is identical);
Step 104, the first audio signal in the first audio signal channel after DSP control module 1 replication processes, then the first audio signal copying is sent to the second audio signal channel;
Step 105, DSP control module 1 is measured the first loud speaker 21 and the second loud speaker 22 sound source distances, determine time delay required between the first loud speaker 21 and the second loud speaker 22 and corresponding acoustic pressure relation, the second audio signal of DSP control module control 1 second audio signal channel is carried out time delay, frequency and acoustic pressure compensation;
Step 106, DSP control module 1 is controlled the second audio signal pole reversal in the second audio signal channel;
Step 107, DSP control module 1 will send to the first power amplifier module 51 through the first audio signal after step 103 in the first audio signal channel, meanwhile, DSP control module 1 will send to the second power amplifier module 52 through the second audio signal after step 106;
Step 108, the first power amplifier module 51 sends to the first loud speaker 21, the second power amplifier modules 52 that the second audio signal is sent to the second loud speaker 22, the first loud speakers 21 and the second loud speaker 22 sounding the first audio signal.
Can be more accurate in order more to make to need the place of sound to have sound stack and do not need the place of sound to have sound to offset at the first loud speaker 21 and the second loud speaker 22, need to increase a debug process, the flow process (shown in Fig. 4) of debug process is as follows:
Step 201, places the first acoustic pressure measurement module 31 in the first loud speaker 21 sounding face directions, places the second acoustic pressure measurement module 32 in the second loud speaker 22 sounding face directions.
Step 202, the first acoustic pressure measurement module 31 and the second acoustic pressure measurement module 32 receive sound pressure signal (the mixing acoustic pressure after the first loud speaker 21 and the common sounding of the second loud speaker 22), and sound pressure signal is sent to DSP control module 1;
Step 203, display module 6 receives the sound pressure signal of DSP control module 1 and shows, user sends to DSP control module 1 by key-press module 7 by push button signalling, thereby DSP control module 1 is controlled acoustic pressure and the frequency of the first audio signal and the second audio signal, adjust audio frequency parameter by above DSP control module 1, the sound wave that can obtain in the place that needs sound stack is the rising of acoustic pressure, and the sound wave that obtains in the place that does not need sound offsetting is the reduction of acoustic pressure simultaneously.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some modification and improvement, these all belong to protection scope of the present invention.
Claims (9)
1. speaker system, is characterized in that, comprises DSP control module (1), at least one first loud speaker (21) and at least one the second loud speaker (22), wherein,
Described DSP control module (1) receives the audio signal that external device (ED) sends, described DSP control module (1) sends to described audio signal the first audio signal channel of DSP control module (1), after processing and copy by described DSP control module (1), send to the second audio signal channel of described DSP control module (1), described DSP control module (1) is processed the second audio signal
Described the first loud speaker (21) receives the first audio signal that described the first audio signal channel sends, described the second loud speaker (22) receives the second audio signal that described the second audio signal channel sends, and the sounding face of the sounding face of described the first loud speaker (21) and described the second loud speaker (22) in opposite directions.
2. speaker system according to claim 1, it is characterized in that, described the first loud speaker (21) has five, five described the first loud speakers (21) are longitudinally arranged, described the second loud speaker (22) has five, five described the second loud speakers (22) are longitudinally arranged, and described the first loud speaker (21) is located at a side of described the second loud speaker (22).
3. speaker system according to claim 2, it is characterized in that, also comprise the first power amplifier module (51) and the second power amplifier module (52), described the first loud speaker (21) is by described the first power amplifier module (51), receive the first audio signal that described the first audio signal channel sends, described the second loud speaker (22), by described the second power amplifier module (52), receives the second audio signal that described the second audio signal channel sends.
4. speaker system according to claim 3, it is characterized in that, also comprise the first acoustic pressure measurement module (31), the second acoustic pressure measurement module (32) and receiver module (4), described the first acoustic pressure measurement module (31) is located at described the first loud speaker (21) sounding face one side, the sound pressure signal that described first acoustic pressure measurement module (31) reception the first loud speaker (21) and the second loud speaker (22) send, and sound pressure signal is sent to described receiver module (4), described the second acoustic pressure measurement module (32) is located at described the second loud speaker (22) sounding face one side, the sound pressure signal that described second acoustic pressure measurement module (32) reception the first loud speaker (21) and the second loud speaker (22) send, and sound pressure signal is sent to described receiver module (4).
5. speaker system according to claim 4, it is characterized in that, also comprise display module and key-press module, described receiver module sends to described display module to show sound pressure signal, described key-press module receives the push button signalling of outside human body and described push button signalling is sent to described DSP control module, and described DSP control module is processed the first audio signal and the second audio signal.
6. according to the speaker system described in claim 4 or 5, it is characterized in that, described the first acoustic pressure measurement module (31) adopts MIC, and described the second acoustic pressure measurement module (32) adopts MIC.
7. the control method of speaker system low frequency, is characterized in that, comprising:
A) DSP control module (1) receives the audio signal that external device (ED) sends,
B) DSP control module (1) sends to described audio signal the first audio signal channel of DSP control module (1),
C) DSP control module (1) is processed and is copied the first audio signal in described the first audio signal channel,
D) described the first audio signal copying is sent to described the second audio signal channel by DSP control module (1),
E) DSP control module (1) is according to the sound source distance of the first loud speaker (21) and the second loud speaker (22) and required counteracting frequency, determine time delay required between described the first loud speaker (21) and described the second loud speaker (22) and corresponding acoustic pressure relation, described DSP control module (1) is controlled the compensation of the second audio signal time delay, frequency and the acoustic pressure of described the second audio signal channel, and by the pole reversal of the second audio signal
F) the first audio signal is sent to the first loud speaker (21) by DSP control module (1), and the second audio signal is sent to the second loud speaker (22) by DSP control module (1).
8. the control method of speaker system low frequency according to claim 7, is characterized in that, also comprises:
G) DSP control module (1) sends to the first loud speaker (21) by the first power amplifier module (51) by the first audio signal, DSP control module (1) sends to the second loud speaker (22) by the second power amplifier module (52) by the second audio signal
H) the first acoustic pressure measurement module (31) receives the sound pressure signal that described the first loud speaker (21) and described the second loud speaker (22) send, and described sound pressure signal is sent to described receiver module (4), the second acoustic pressure measurement module (32) receives the sound pressure signal that described the first loud speaker (21) and described the second loud speaker (22) send, and described acoustic pressure is sent to described receiver module (4).
9. the control method of speaker system low frequency according to claim 8, is characterized in that, also comprises:
I) receiver module (4) sends to display module (6) to show sound pressure signal, and key-press module (7) receives outside push button signalling and described push button signalling is sent to described DSP control module (1).
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| CN105100413A (en) * | 2015-05-27 | 2015-11-25 | 努比亚技术有限公司 | Information processing method, device and terminal |
| CN111182411A (en) * | 2019-12-04 | 2020-05-19 | 东莞市三基音响科技有限公司 | Variable-directivity low-frequency sound box |
| CN108062218B (en) * | 2018-01-16 | 2023-12-05 | 北京唱吧科技股份有限公司 | Sound card device |
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Application publication date: 20141001 |