SU708217A1 - Method of evaluating the degree of diffusion of sound field - Google Patents
Method of evaluating the degree of diffusion of sound field Download PDFInfo
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- SU708217A1 SU708217A1 SU782596461A SU2596461A SU708217A1 SU 708217 A1 SU708217 A1 SU 708217A1 SU 782596461 A SU782596461 A SU 782596461A SU 2596461 A SU2596461 A SU 2596461A SU 708217 A1 SU708217 A1 SU 708217A1
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- sound
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Description
Изобретение относ1ггс к области приборостроени и может быть использовано при акустических измере1ш х.The invention relates to the field of instrumentation and can be used for acoustic measurements.
Известен способ оценки степени диффузности звукового пол , основанный на измерении пространственного распределени среднеквадратного значени звуковых давлений и распределе1ш потока энергии звуковых волн по углам прихода с помощью направле шых систем.A known method for estimating the degree of diffuseness of a sound field is based on measuring the spatial distribution of the mean square value of sound pressures and the distribution of the sound wave energy flux at the angles of arrival using directional systems.
Однако этот способ обо печивает контроль нарушени только одного из указанных условий.However, this method provides control over the violation of only one of the specified conditions.
Известен также способ оценки степени диффузности звукового пол в помещени х основанный на определении нормированной функции пространственной коррел ции пол звуковых давлений и ее сличешш со значени ми дл идеального диффузного пол 2.There is also known a method for estimating the degree of diffusivity of a sound field in rooms based on the determination of the normalized spatial spatial correlation function of the sound pressure field and its comparison with the values for an ideal diffuse field 2.
Однако sTKi.i способом невозможно контрол1фовать количественное нарушение услови изотропности и судить о распределении знсргии волн по углам прихода.However, it is not possible to control the quantitative violation of the isotropy condition by sTKi.i and to judge the distribution of the wave density at the angles of arrival.
Целью изобретени вл етс обеспечение возможности оцетгки распределени звуковой энергии по различным направлени м ее прихода и повышение точности контрол .The aim of the invention is to provide the possibility of otstgki distribution of sound energy in various directions of its arrival and improving the accuracy of control.
Поставленна цешь достигаетс за счет того, что пормированную фу11кш1Ю пространствешюй коррел шш преобразугоТ в волновой спектр, после чего степень диффузности пол определ ют по отклонению волнового спектра от обратно пропорционального среднего значени волнового числа в диапазоне этих чисел, соответствующего диапазону частот от нул до средней частоты полосового измерительного сигнала, а распределение звуковой энергии но различным направлени определ ют по отклонению измеренного значени пространственно-волно юго спектра от обратно пропорциональногч) с)одства значешш волнового числа дл со .тветствузощего значешш тако1х же числа, св зашюго с углом 1ф1копа зпукопой Э1горГШ1 .The result is that the fuzzed space of the correlator transforms into a wave spectrum, after which the degree of diffusivity of the field is determined by the deviation of the wave spectrum from the inverse proportional average wave number in the range of these numbers corresponding to the frequency range from zero to the average frequency of the band measurement signal, and the distribution of sound energy but different directions is determined by the deviation of the measured value of the space-wave of the south spectrum from of inverse proportsionalnogch) c) odstva znacheshsh wavenumber for .tvetstvuzoschego znacheshsh tako1h with the same number, communication zashyugo angle 1f1kopa zpukopoy E1gorGSh1.
На фиг. 1 показаны эксперимеитальиый 1 и теоретический П графики, по разпнчшо которых суд т о степени ди|)фузнпсти звукового пол ; на фиг. 2 структурна схема устройства, реализующего описываемый способ оценки степени диффузности звукового поп .FIG. Figure 1 shows the experimental 1 and theoretical graphs, according to which they are judged on the degree of di |) fuzpsty sound field; in fig. 2 is a block diagram of a device that implements the described method of assessing the degree of diffuseness of sound pop.
Устройство состоит из измерител .пространственной коррел хщи звукового пол , содержащего микрофоны 1 и 2, уси лйте и 3 и 4, координатное устройство 5 дл перемещени микрофона 2, коррел тор б и косинус преобразовател Фурье 7, Причем неподвижный 1 и подвижный 2 микрофоны через усилители 3 к 4 св заны со входами коррел тора 6, выход которого соединен с координатным устройством подвижного микрофона. По отклонению выходного сигнала косинус преобразовател Фурье от значени сигнала, соответствующего идеальному диффузному полю, суд т о степени диффузности пол и распределении энергии волн по углам их прихода.The device consists of a spatial meter correlator sound field soundboxes containing microphones 1 and 2, amplifiers and 3 and 4, coordinate device 5 for moving microphone 2, correlator b and cosine Fourier transducer 7, and fixed 1 and movable 2 microphones through amplifiers 3 to 4 are connected to the inputs of the correlator 6, the output of which is connected to the coordinate device of the moving microphone. From the deviation of the output signal, the cosine of the Fourier transducer from the value of the signal corresponding to the ideal diffuse field determines the degree of diffuseness of the field and the distribution of wave energy at the angles of their arrival.
Описанный способ позвол ет одновремешю с оценкой степени диффузности в целом определ ть распределение .энергии волн по углам ее прихода. При этом повьпиаетс контрол нарушени услови изотопности..The described method makes it possible, simultaneously with the assessment of the degree of diffuseness in general, to determine the distribution of the wave energy over the angles of its arrival. At the same time, the violation of isotopic conditions is controlled ..
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SU782596461A SU708217A1 (en) | 1978-03-28 | 1978-03-28 | Method of evaluating the degree of diffusion of sound field |
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SU782596461A SU708217A1 (en) | 1978-03-28 | 1978-03-28 | Method of evaluating the degree of diffusion of sound field |
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SU708217A1 true SU708217A1 (en) | 1980-01-05 |
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SU782596461A SU708217A1 (en) | 1978-03-28 | 1978-03-28 | Method of evaluating the degree of diffusion of sound field |
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1978
- 1978-03-28 SU SU782596461A patent/SU708217A1/en active
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