Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 TESTING OF LOUD SPEAKERS 253 are in phase. The phase angle, in degrees, between the output of the two microphones is d = - 360° X where d = distance between the two microphones in the direction of propa- gation, in centimeters, and X = wavelength of the sound, in centimeters. MICROPHONES Fig. Schematic arrangement of apparatus for measuring the phase characteristic of a microphone. Phase distortion is of importance in combination microphones such as the unidirectional m
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 TESTING OF LOUD SPEAKERS 253 are in phase. The phase angle, in degrees, between the output of the two microphones is d = - 360° X where d = distance between the two microphones in the direction of propa- gation, in centimeters, and X = wavelength of the sound, in centimeters. MICROPHONES Fig. Schematic arrangement of apparatus for measuring the phase characteristic of a microphone. Phase distortion is of importance in combination microphones such as the unidirectional microphone. See Sec. E. Electrical Impedance Characteristic. — The electrical impedance char- acteristic of a microphone is the impedance at the output terminals as a function of the frequency. Any convenient method for measuring elec- trical impedance may be used for determining the impedance character- istic. F. Transient Response Characteristic. — For measurement of transient response, see Sec. Testing of Loud Speakers. — Many different measurements are required to determine the performance of a loud speaker. The most important characteristics which depict the performance of a loud speaker are as follows: 1. Response frequency characteristic. 2. Directional characteristic. 3. Nonlinear distortion characteristic. 4. Efficiency frequency characteristic. 5. Phase distortion characteristic. 6. Electrical impedance characteristic. 7. Transient response characteristic.
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