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. 02, 1991
Filed:
Sep. 19, 1989
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A tone control circuit having a first differential amplifier and a second differential amplifier. The first differential amplifier comprises first and second transistors whose emitters are connected. The second differential amplifier comprises third and fourth transistors whose emitters are connected. The base and collector of the third transistor are connected to the base of the second transistor and the collector of the first transistor, respectively. The base and collector of the fourth transistor are connected to the base of the first transistor and the collector of the second transistor, respectively. A demodulated signal is input to the differential amplifier, and also to the second different amplifier via a band-pass filter. When a tone control signal is supplied to the bases of the first to fourth transistors, a signal generated by attenuating at least the low-frequency component of the demodulated signal is output from a tone control-signal output terminal connected to the collectors of the first to fourth transistors.