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:
Aug. 10, 2004
Filed:
Feb. 28, 2001
Masafumi Toshitani, Hamamatsu, JP;
Hitoshi Koseki, Hamamatsu, JP;
Yamaha Corporation, Shizuoka-ken, JP;
Abstract
A synchronization control apparatus and method enables synchronization control which can flexibly accommodate various frequencies using a simple circuit construction. A storage device that has a predetermined capacity, such as a FIFO, stores externally input data. A CPU controls an output frequency at which data stored in the storage device are output, based on an average frequency which is an average of the output frequency and on a coefficient for setting the average frequency at a fixed value, the first frequency controlling device calculating the average of the output frequency whenever a timing signal is input in accordance with a predetermined cycle and determining the coefficient depending on a free capacity of the storage device at a time of inputting of the timing signal. The CPU operates if the calculated average frequency continuously exhibits a fixed value for a predetermined time period, to decrease the output frequency when the free capacity of the storage device is larger than a predetermined upper threshold value, while increasing the output frequency when the free capacity of the storage device is smaller than a predetermined lower threshold value. The upper threshold value and the lower threshold value each comprise two different values.