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. 30, 1985
Filed:
Mar. 02, 1984
Yukinobu Ishigaki, Tokyo, JP;
Kazutoshi Hirohashi, Yokohama, JP;
Abstract
An analog audio signal having a high frequency preemphasis is applied to a sampling pulse generator (2) which generates a sampling pulse in response to an impulse noise introduced to the signal and also to a sample-hold and deemphasis circuit (5; 50) which deemphasizes the audio signal when impulse noise is nonexistent and holds the signal in the presence of the sampling pulse. A differentiator (6) derives a signal representative of the slope ratio of the analog signal from the deemphasized signal. A sample-and-hold circuit (7) samples the slope ratio signal in response to the sampling pulse and applies it to a charging and discharging circuit (8; 503) which performs linear charging and discharging of the capacitor (55; 505) at a rate variable as a function of the sampled signal to reconstruct the portion of the signal lost during the sampling period.