1980-04-14
1982-12-28
Popek, Joseph A.
G01K 1100
Patent
active
043663460
ABSTRACT:
Artificial reverberation apparatus comprising a delay device (1) provided with a feedback circuit (5) and a feed-forward circuit (6) having a gain equal and opposite to that of the feedback circuit if the gain in the delay device is unity. In order to simulate a second echo having a different delay time using a minimum number of circuit components, the foregoing reverberation circuit is included in cascade with a second delay device (11) and the resulting combination is provided with its own feedback circuit (15) and feed-forward circuit (16). In order to simulate a third echo having yet another delay time, the resulting circuit may be included in cascade with a third delay device (21) with the resulting combination having its own feedback circuit (25 ) and feed forward circuit (26).
REFERENCES:
patent: 3939437 (1976-02-01), Adam
de Haan, administrator by Friedrich J.
Dijkmans Eise C.
Franssen, deceased Nico V.
Franzblau Bernard
Mayer Robert T.
Popek Joseph A.
U.S. Philips Corporation
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