Music – Instruments
Patent
1975-02-20
1976-03-23
Hix, L. T.
Music
Instruments
84 124, 84DIG26, 179 1J, 333 29, G10H 102, H03H 732, H04R 300
Patent
active
039452905
ABSTRACT:
The invention relates to an apparatus for producing a vibrato effect in acoustic signals, particularly for electronic organs, in which the output signals are obtained by successively scanning a plurality of points of a delay line fed by the acoustic signals. The apparatus includes a scanning matrix having a field of first inputs each connected to one of the points to be scanned, a field of second inputs to each of which a scanning impulse can be successively fed by a scanning impulse generator, and a linking circuit associated with each pair of second inputs, which linking circuits, upon the occurrence of a scanning impulse at the second input, transmit the acoustic signal of the associated first input to a common output, the scanning impulse generator producing impulses of a shape in which the rising and falling flanks are in the form of transition sections extending over a predetermined period, each linking circuit comprising a control stage which is controlled by the scanning impulse and influences the amplitude of the acoustic signal fed to the output. The individual points of the delay line are scanned electronically by means of the scanning matrix. The scanning impulses not only serve to select the desired point but also for gradually blending in and out the acoustic signal at the selected point. Consequently, one obtains a complex vibrato which is pleasant to listen to, without superpositioning background noise caused by the switching frequency.
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patent: 3833752 (1974-09-01), Van Der Kooij
Hix L. T,.
Wersi-electronic GmbH & Co. KG
Witkowski Stanley J.
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