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:
Aug. 14, 2012
Filed:
Aug. 03, 2009
Yasushi Sato, Kitakyushu, JP;
Atsuko Ryu, Kitakyushu, JP;
Yasushi Sato, Kitakyushu, JP;
Atsuko Ryu, Kitakyushu, JP;
Kyushu Institute of Technology, Kitakyushu-Shi, Fukuoka, JP;
Abstract
An acoustic characteristic control apparatus supplies music signal, for example, to input terminal connected to a band-pass filter and a peaking filter. In a zero-cross detection circuit, a pulse signal corresponding to a period while a signal is positive is formed. A pulse-width measuring circuit output a signal corresponding to a pulse width. Next, the output of the pulse-width measuring circuit is inputted to one comparator and another comparator. The one comparator discriminates a time when the pulse width is equal to or larger than a first setting value, and the another comparator discriminates a time when the pulse width is equal to or smaller than a second setting value. The comparator is connected to the up terminal and the down terminal of an up/down counter. The output of the up/down counter is connected to the peaking filter through the subtractor, and acoustic characteristics of the peaking filter is controlled according to the count value of the up/down counter.