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:
Jan. 06, 2009
Filed:
Jan. 09, 2004
Arthur L. Cohen, Mountain View, CA (US);
John Glissman, Valley Ford, CA (US);
Arthur L. Cohen, Mountain View, CA (US);
John Glissman, Valley Ford, CA (US);
Aerielle Technologies, Inc., Mountain View, CA (US);
Abstract
A circuit (FIGS.A-D) and method of providing an auto-on and/or auto-off capability for an audio device, of a type having an audio plug () which mates with the output jack of an audio source. The portable transmitter () modulates audio signals from the audio source onto a carrier and transmits them to a receiver. The auto-on and auto-off capability is provided to prolong battery life and degradation of the transmitter circuit and comprises pinching off a FET (Q) when the circuit is in an 'off' state. This occurs when a pre-determined threshold in a capacitor is reached by not discharging that capacitor. The capacitor (C) is discharged by dropping a comparator input below a pre-determined threshold limit when presented with an audio peak and wherein the drop in value causes the comparator output to go low, causing the capacitor to discharge and causing the FET (Q) to supply power to the regulator.