摘要:

This is a defense of the existing system of notation in organbuilding.

ISSN:0001-4966    

DOI:10.1121/1.1911715

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

The organbuilder's system of octave notation has too many disadvantages to justify substituting it for the present American Standards Terminology.

ISSN:0001-4966    

DOI:10.1121/1.1911716

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

A double‐ended organ pipe, symmetrical about its midplane, was blown at one of its mouthpieces and radiation patterns were observed in an anechoic chamber. The sharp nulls on the midplane show that the unexcited end is very nearly as strong a source as the blown end. Thus, the blowing jet current, even though chopped by the switching action, does not contribute materially to the radiated sound. This also implies that the jet current does not contribute directly to sustaining oscillations in the pipe.

ISSN:0001-4966    

DOI:10.1121/1.1911717

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

All 12 frequencies of an even‐tempered scale can be approximated by frequency division of the output of a single, stable, high‐frequency oscillator. Digital integrated circuits have now become a convenient means for dividing by a different integer for each note. The 12 integer divisors giving the smallest attainable maximum frequency error are tabulated for binary counters ranging from 6–12 stages.

ISSN:0001-4966    

DOI:10.1121/1.1911718

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

A study of the intraoral air pressures for /p/ in oral and whispered vowel environments revealed: (1) significantly lower air pressures for the whispered /p/ productions, and (2) a significant differential influence for high versus low vowel environments.

ISSN:0001-4966    

DOI:10.1121/1.1911719

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

The effect of random noise on the growth rate of 12 tobacco plants is presented. During a two‐week period of exposure, the average growth rate of the plants decreased by 40.6%.

ISSN:0001-4966    

DOI:10.1121/1.1911721

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP

摘要:

A particle velocity sound unit is introduced, the microvar, which equals 1/ρccm sec. Approximate formulas for the nearfield and farfield are derived which indicate that in the farfield, velocity in microvars and pressure in microbars are equal; in the nearfield, the pressure‐velocity ratio falls off at 6 dB per distance octave as the source is approached; and the crossover point between near‐ and farfields on the major vibration axis is distant from the sourcenλ, 2π, wheren= 1 for a monopole, 2 for a dipole, and 3 for a quadrupole source. Off the major axis the crossover point moves farther away from the source. The approximate formulas are shown to be in reasonable agreement with theoretical values. It is concluded that the stimulus is present to permit a velocity displacement‐sensitive organism to detect sound at any distance from a source of sufficient intensity.

ISSN:0001-4966    

DOI:10.1121/1.1911722

出版商:Acoustical Society of America    

年代:1969

数据来源: AIP