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. 26, 2002
Filed:
Jul. 20, 2000
Yamaha Corporation, Hamamatsu, JP;
Abstract
Most appropriate data of a plurality of level-converted digital data obtained by level conversion of the same input digital data by different conversion factors is selected based on a signal quality of each level-converted digital data. The other level-converted digital data is attenuated to or below a predetermined noise level. Switching between previously selected data and newly selected data is effected by cross-fading. The level-converted digital data are D/A converted to respective analog signals. Level conversion of the analog signals are carried out again based on respective corresponding ones of the conversion factors to restore a level of the input digital data, and all the level-converted analog signals are then added together. When an amplitude level of the input digital data exceeds a predetermined value, the cross-fading is started between the previously selected data and the newly selected data which are delayed by the predetermined amount of delay, and when during the cross-fading a larger rate of change in the amplitude level of the input digital data than a predetermined value is detected, the cross-fading is carried out at a rate larger than a predetermined rate in dependence on the rate of change in the amplitude level. In another form, the cross-fading is started at a first rate when the amplitude level exceeds a first predetermined value, and when during the cross-fading the amplitude level exceeds a second predetermined value larger than the first one, the cross-fading is carried out at a second rate larger than the first rate.