1979-04-23
1981-10-13
Robinson, Thomas A.
179 1D, H04R 128
Patent
active
042950066
ABSTRACT:
According to a first aspect of the invention, a diffraction compensation circuit is employed to relatively raise the level of an input electrical audio signal at low frequencies. A speaker is driven in response to the output signals of the diffraction compensation circuit, thereby offsetting a diffraction characteristic inherent in a speaker enclosure. According to a second aspect of the invention, the radiation surface of the vibrating member of a speaker is made flat. The speaker is installed in an enclosure in such a manner that the flat surface of the vibrating member is flush with the exterior surface of the enclosure, thereby reproducing an audio signal with high fidelity.
REFERENCES:
patent: 3984635 (1976-10-01), Nestorovic et al.
patent: 4015089 (1977-03-01), Ishii et al.
patent: 4118600 (1978-10-01), Stahl
Suzuki Hidetsugu
Tanaka Mitsuaki
Robinson Thomas A.
Victor Company of Japan , Limited
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