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:
May. 06, 1980
Filed:
Jul. 15, 1977
Harold W Hill, Jr, Pleasantville, NJ (US);
Other;
Abstract
An audio signal mixing apparatus requiring no active elements, for a conventional audio amplifier unit having a tape monitor function. Low level signal inputs are level-controlled by potentiometers, mixed, and supplied to the phono input of the conventional amplifier. With the conventional amplifier unit set in the phono and tape monitor modes, the mixed low level signal is preamplified by the input amplifier stage of the amplifier unit and provided to the tape monitor output of the amplifier unit. High level inputs to the mixing apparatus are controlled by respective potentiometers and mixed before being supplied to the high level input of the conventional amplifier unit. A switch in the mixing device allows the preamplified signals from the tape monitor output of the amplifier unit to be combined with the high level inputs and provided to the tape input of the conventional amplifier unit. In this way, the mixing apparatus may be made completely passive without requiring all audio program sources to provide signals of substantially equal level and impedance characteristics.