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:
Sep. 12, 2000
Filed:
Nov. 12, 1997
Masato Onaya, Gunma-ken, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In a surround circuit, an audio signal or another analog signal is converted to a digital signal by an A/D conversion circuit (11) and stored in a memory (12). Subsequently, the digital signal read from the memory (12) is converted to an analog signal by a D/A conversion circuit (13). The memory (12) then functions as a delay circuit, and a delayed audio signal is obtained. By superimposing the obtained delay signal to the transmitted audio signal, a surround sound is obtained. Here, a sampling frequency of either one of the A/D conversion circuit (11) and the D/A conversion circuit (13) is changed with an elapse of time, which leads the sampling frequency of the A/D conversion circuit (11) to differ from that of the D/A conversion circuit (13), and the frequency of an output signal of the D/A conversion circuit (13) differs from that of the audio signal transmitted to the A/D conversion circuit (11). Consequently, a delay signal in which the frequency of the input audio signal is dispersed can be obtained.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile