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:
Nov. 30, 2004
Filed:
May. 06, 1999
Atsushi Ishida, Hamamatsu, JP;
Yamaha Corporation, Hammatsu, JP;
Abstract
Tone generator LSI generates a subframe start signal to be interruptively given to a microprogram, by which the microprogram is activated to issue an interrupt signal to a device driver. In response to the interrupt signal, the device driver prepares control data for use in a next frame. The microprogram receives control data from a RAM at the beginning of each frame and calculates control data for individual samples of the frame on the basis of the received control data as well as control data generated for the last sample of an immediately preceding frame, so as to create a plurality of samples of tone data for each subframe. The thus-created tone data are temporarily written into a buffer and then read out from the buffer in accordance with predetermined clock pulses.