CN105115585A - Measuring method for reverberation time of reverberation room - Google Patents
Measuring method for reverberation time of reverberation room Download PDFInfo
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- CN105115585A CN105115585A CN201510439605.5A CN201510439605A CN105115585A CN 105115585 A CN105115585 A CN 105115585A CN 201510439605 A CN201510439605 A CN 201510439605A CN 105115585 A CN105115585 A CN 105115585A
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- 238000005259 measurement Methods 0.000 claims abstract description 31
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- 230000003068 static effect Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 3
- 230000026676 system process Effects 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000010521 absorption reaction Methods 0.000 description 2
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Abstract
The invention provides a measuring method for reverberation time of a reverberation room. The measuring method comprises the steps that: a set of reverberation time measurement is carried out on a member to be tested in the reverberation room, and a series of angles of a rotary diffuser are set firstly; a control system controls a transmission device to rotate the rotary diffuser in the reverberation room to a first specified angle, when the rotary diffuser rotates in place and remains stationary, a pulse response integral method is adopted for measuring reverberation time; the transmission device is controlled to rotate the rotary diffuser to the next angle then the rotary diffuser remains stationary, the reverberation time is measured again, and the circulation is performed until the measurement is completed; the measured data is averaged, and a result is output.
Description
Technical field
The present invention relates to reverberation chamber sound absorption measurement field, the method that especially a kind of reverberation chamber reverberation time measures.
Background technology
The measurement of reverberation chamber reverberation time has had method disclosed in some, as SchroederMR.Integrated ?impulsemethodmeasuringsounddecaywithoutusingimpulses [J] .TheJournaloftheAcousticalSocietyofAmerica, 1979,66 (2): 497-500.Also have, reverberation chamber absorption arranges Rotational diffusion body usually to the effect reaching sound field and fully spread to carry out reverberation time measurement when measuring: Rotational diffusion body continues to rotate under the driving of motor, destroy indoor in wave stability, increase the diffusibleness of room sound field.But, Rotational diffusion body, in the process of lasting rotation, makes the transport function in room constantly change, thus impulse response integral method can not be utilized to carry out the measurement of reverberation time, can only use and interrupt sound source method same observation station repetitive measurement, the workload of measurement and Data Processing in Experiment is all very large.
Summary of the invention
The present invention seeks to, a kind of reverberation chamber reverberation time measuring method is proposed, the method utilizes the advantage of Rotational diffusion body and impulse response integral method to carry out reverberation chamber acoustic absorptivity measurements simultaneously, low in order to overcome existing measuring method measurement efficiency, the deficiency that manual operation load is large, makes Automatic survey, more convenient, more accurate.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps: a kind of reverberation chamber reverberation time measuring method, when reverberation chamber carries out one group of measurement, first sets the angle of a series of Rotational diffusion body;
Control system controls gearing and the Rotational diffusion body in reverberation chamber is rotated to first specified angle, be rotated in place keep static after, adopt impulse response integral method to carry out reverberation time measurement;
Control to keep static after Rotational diffusion body is rotated to next angle by gearing, then carry out reverberation time measurement, circulate with this until complete measurement; Averaged measurements, Output rusults.
The angle state of described a series of Rotational diffusion body refers to that Rotational diffusion body covers the state at 360 ° of angles.In 360 ° with 10-30 ° for step-length selectes the angle of Rotational diffusion body, so this group measures the reverberation time of the spatiality amounting to 12-36 angle, is averaged obtains result to the independent measurement data of 12-36 group.
The invention has the beneficial effects as follows, the reverberation chamber reverberation time measures each measuring point (angle state of a series of Rotational diffusion body) and only need measure once, and the measurement data obtained easily when not mobile microphone position under many group spatialities, improve measurement efficiency, save manually-operated labor capacity.Can realize automatic measurement, survey crew can away from measurement noise source, the hearing safety of protection personnel simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is a typical embodiments system configuration of the present invention.
Fig. 2 is the typical implementing procedure of one of the present invention.
Embodiment
In FIG, measuring system comprises the modules such as signal analyzer, speech amplifier and Mersure Controler, wherein signal analyzer can use NTiXL2, AubionX8.0 etc. to have the equipment of real-time analysis function, speech amplifier will meet the power that can provide the sufficient signal to noise ratio (S/N ratio) of sound source, Mersure Controler can select software simulating on computers, as EASERA, the Norsonic840 of guidance panel and hardware integration also can be selected.Measuring system is connected with the sound source be placed in reverberation chamber (being generally loudspeaker) and microphone.Test specimen 4 to be measured can be selected to meet 10m
2acoustic absorbant component, as various stringiness acoustic absorbant, standard size sound absorbing plate and discrete sound absorber, also can not place test specimen to be measured and barnyard is measured.When performing measurement, under the control of measuring system, sound source 5 sends specific acoustic signal, and conventional signal is maximal-length sequence pseudo random signal, and the signal that microphone 6 picks up draws through measuring system process the reverberation time that reverberation chamber 3 is current.Rotational diffusion body control system controls the kinematic train driving Rotational diffusion body to rotate, thus realization control Rotational diffusion body rotates to specified angle.
Measuring system can communicate with Rotational diffusion body control system, receives or sends order and status information.Rotational diffusion body control system is given an order, and the driving stepper motor Rotational diffusion body of kinematic train rotates.The angle state information of Rotational diffusion body also can be fed back to Rotational diffusion body control system by volume angular transducer by kinematic train, then feeds back to measuring system, forms closed-loop control.
In the embodiment shown in fig. 1, two SA15AG tapered Rotational diffusion body is used to be typical Rotational diffusion body 1, to be fixed on a beam in midair for rotation axis 2, the blade playing main diffusion is fixed on the umbrella skeleton of Rotational diffusion body, external motor is fixed on wall, and driving force is transmitted by chain.When carrying out one group and measuring, need the angle state of first specifying a series of Rotational diffusion body, measure in the reverberation time that each angle state of specifying uses impulse response integral method to carry out single.After measurement starts, Rotational diffusion body 1 is rotated to first specified angle by control gearing by system, be rotated in place keep static after, carry out reverberation time and measure; And then control to keep static after Rotational diffusion body is rotated to next angle by gearing, then measure, circulate until complete measurement with this.Suppose in advance in 360 ° with 10 ° for step-length selectes the angle of Rotational diffusion body, so this group measures the spatiality of 36 angles altogether, is averaged, can improves space bias to 36 groups of independence measurement data.Low-frequency range (100Hz-200Hz) can improve 20%, and Mid Frequency (200Hz-500Hz) can improve 10%, and high band (500Hz-5000Hz) can improve 5%.Fig. 2 is that the typical implementing procedure utilization of one of the present invention realizes the present invention.
Claims (4)
1. a reverberation chamber reverberation time measuring method, is characterized in that, comprise the following steps:
Treat test block at reverberation chamber and carry out one group of reverberation time measurement, first set the angle of a series of Rotational diffusion body;
Control system controls gearing and the Rotational diffusion body in reverberation chamber is rotated to first specified angle, be rotated in place keep static after, adopt impulse response integral method to carry out reverberation time measurement;
Control to keep static after Rotational diffusion body is rotated to next angle by gearing, then carry out reverberation time measurement, circulate with this until complete measurement; Averaged measurements, Output rusults.
2. reverberation chamber reverberation time measuring method according to claim 1, it is characterized in that, the angle of described a series of Rotational diffusion body refers to that Rotational diffusion body covers the state at 360 ° of angles, in 360 ° with 10,20 or 30 ° for step-length selectes the angle of Rotational diffusion body, so this group measures the reverberation time of the spatiality amounting to 12-36 angle, is averaged obtains result to the independent measurement data of 12-36 group.
3. reverberation chamber reverberation measurement method according to claim 1, is characterized in that: measuring system communicates with Rotational diffusion body control system, receives or sends order and status information; The convolution of the angle state information feed back of Rotational diffusion body is turned diffuser control system by kinematic train.
4. reverberation chamber reverberation measurement method according to claim 1, it is characterized in that: when performing measurement, under the control of measuring system, the signal of sound source is maximal-length sequence pseudo random signal, and the signal of microphone pickup draws through measuring system process the reverberation time that reverberation chamber is current.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768266A (en) * | 2017-03-07 | 2017-05-31 | 江苏大学 | A kind of measuring method of the factory building reverberation time for rejecting background noise energy |
| CN107782997A (en) * | 2017-10-27 | 2018-03-09 | 北京邮电大学 | Working region determines method and device in a kind of reverberation chamber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768266A (en) * | 2017-03-07 | 2017-05-31 | 江苏大学 | A kind of measuring method of the factory building reverberation time for rejecting background noise energy |
| CN106768266B (en) * | 2017-03-07 | 2019-04-30 | 江苏大学 | A kind of measurement method of workshop reverberation time that rejecting background noise energy |
| CN107782997A (en) * | 2017-10-27 | 2018-03-09 | 北京邮电大学 | Working region determines method and device in a kind of reverberation chamber |
| CN107782997B (en) * | 2017-10-27 | 2019-09-20 | 北京邮电大学 | Working region determines method and device in a kind of reverberation chamber |
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