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:
Jul. 15, 1986
Filed:
Mar. 06, 1985
Masayuki Yoshida, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A digital-to-analog converter circuit for converting digitized audio signals to analog form having improved phase characteristics and a reduced noise level while employing a less costly low-pass filter than conventional circuits. A digital-to-analog converter converts an analog signal, which has frequency components within a range lower than a first frequency, to analog form. A sample-and-hold circuit samples and holds the output of the digital-to-analog converter at a second frequency more than twice as high as the first frequency. Frequency components in the output of the sample-and-hold circuit above a third frequency between the first and second frequencies are phase inverted. The output of the sample-and-hold circuit and the output of the inverting circuit are summed and applied to a low-pass filter, the output of which provides the analog output from the circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile