344 



INDEX 



Unidirectional microphone, combination 

 velocity and pressure, 203, 204 



phase shifting, 210 

 Units, table, acoustical, 76 



electrical, 76 



mechanical, 76 



Velocity, microphone, 189 



potential, 7 



of sound, 7 

 table, 8 

 Vibrating piston, directional, 29 



impedance, 80 

 Vibration, longitudinal, bars, 44 

 pipes, 47 



torsional, bars, 46 



transverse, bars, 38 

 strings, 36 

 Vibrato, 325 

 Viscosity, 77, 78 

 Vocoder, 319 

 Voder, 240 



Voice coils, loud speaker, 142, 171 

 Vowel sounds, 318 



Wave, equation, 4, 6, 7 



filters, band, elimination, 69, 74 

 pass, 69, 73 

 high pass, 69, 72 

 low pass, 69, 70 

 response, 70 

 plane, 7 



amplitude, 9 

 particle velocity, 9 

 pressure, 9 

 spherical, 10 



particle velocity, 12 

 phase angle, 12 

 pressure, 1 1 

 stationary, 13 

 Wavelength, 3 

 Wind screening of microphones, 222 



Young's modulus, table, 48 



Zone plate, 18 



