摘要:

When the components of a harmonic series are of equal amplitude, pitch ratings are determined almost exclusively by the fundamental frequency of the series. Only by extreme modification of the amplitudes of the several components was it possible to modify the pitch ratings assigned to the harmonic series in a direction opposite to that determined by the fundamental frequency.

ISSN:0001-4966    

DOI:10.1121/1.381626

出版商:Acoustical Society of America    

年代:1977

数据来源: AIP

摘要:

A probe‐tube microphone has been developed for use in the harsh experimental environment involved in studying small‐scale pressure fluctuations in combustion magnetohydrodynamics. A smooth frequency response is obtained by a theoretically derived method of impedance matching where an acoustical resistance is placed midway within the length of the tube. The use of such probe‐tube microphones under experimental conditions has proven very satisfactory.

ISSN:0001-4966    

DOI:10.1121/1.381627

出版商:Acoustical Society of America    

年代:1977

数据来源: AIP

摘要:

To answer the question as to whether or not the microphones were given sufficient time to ’’recover’’ from a particular humidity we elaborate further on the experimental procedure.

ISSN:0001-4966    

DOI:10.1121/1.381628

出版商:Acoustical Society of America    

年代:1977

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.381685

出版商:Acoustical Society of America    

年代:1977

数据来源: AIP