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:
Jan. 03, 2012
Filed:
Nov. 14, 2008
Min-shing Wu, Hsinchu, TW;
Chuen-an Lin, Hsinchu, TW;
Min-Shing Wu, Hsinchu, TW;
Chuen-An Lin, Hsinchu, TW;
Holtek Semiconductor Inc., Hsinchu, TW;
Abstract
The present invention discloses a synchronizing device for real-time USB audio data transmission, comprising: a first adder unit, a start-of-frame countdown unit, a phase-locked loop circuit, a frequency divider, a second adder unit, a third adder unit, a fourth adder unit, a frame calibrating register unit, a calibrating mapping unit and a calibrating pulse generating unit. A start-of-frame token sent by the USB host is used as a 1-ms reference cycle so that a high-frequency clock passes through the frequency divider to issue a first clock. The first clock signal has a constant clock number in a USB start-of-frame. The absolute time is automatically adjusted according to the duration of a previous start-of-frame. Therefore, asynchronicity of data transmission between the USB host and external devices can be overcome.