The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 1991
Filed:
Jun. 23, 1989
Yamaha Corporation, Hamamatsu, JP;
Abstract
A variable delay circuit for delaying an input signal and being capable of changing length of this delay is provided and various modulation effects are imparted by this delay. When change in the delay length has been designated, a decay envelope is imparted to a delay output tone signal corresponding to the delay length before the change and then a rise envelope is imparted to a delay output signal corresponding to the delay length after the change. Generation of a click noise during the change in the delay length thereby is prevented. Alternatively, when the delay length is to be changed, a decay envelope is imparted to a delay output signal corresponding to the delay length before the change and, simultaneously, a rise envelope is imparted to a delay output tone signal corresponding to the delay length after the delay and the two signals are combined. Alternatively further, when the delay length is to be changed, the delay length is sequentially changed in plural steps from the delay length before the change to the delay length after the change.