Method and apparatus for measuring characteristics of a loudspea

Details Method and apparatus for measuring characteristics of a loudspea Method and apparatus for measuring characteristics of a loudspea

1978-07-13

1980-06-24

Robinson, Thomas A.

H04R 2900

Patent

active

042096723

ABSTRACT:
A loudspeaker and a microphone are arranged in a normal room, the loudspeaker being supplied with an impulse signal. A direct response sound from the loudspeaker and reflected sounds from wall surfaces in three directions of the normal room are converted into a response signal by the microphone. The response signal is A/D-converted, and then Fourier-transformed. The Fourier-transformed response signal is converted into a response signal with an absolute value, and then into a logarithmic response signal. The logarithmic response signal is filtered to eliminate signal components corresponding to the reflected sound. The filtered logarithmic response signal is A/D-converted, and supplied to a recorder.

REFERENCES:
patent: 3912880 (1975-10-01), Powter et al.
patent: 4066842 (1978-01-01), Allen
Oppenheim et al., "Homomorphic Analysis of Speech," IEEE Trans. Audio Electroacoust., vol. Au-16, No. 2, Jun. 1968, pp. 221-226.

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