Class 381/9 - Four or more diodes

Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter in which the detector or demodulator contains
No. of patents: 3
Last issue date: 07/29/2008

Number	Title	Issue Date
7406180	Headphone with behind-the-head headband There is provided a headphone with a behind-the-head headband comprising at least one transducer and a behind-the-head headband for receiving the transducer. The behind-the-head headband further comprises first and second contact locations for resting against a temp...	07/29/2008
6931136	Infrared emitter An infrared emitter comprises a preamplifier, an infrared RF emitter, an infrared channel controller and a photodiode emitting-medium. With the emitter, by switching between two channels with an infrared channel controller, and by the mode of arrangement of a plural...	08/16/2005
4727583	Telephone transducer with improved frequency response An audio arrangement includes a thin speaker/transducer positioned within a portable housing wherein the speaker cavity is dimensioned to move the resonant frequency of the speaker/housing combination up to approximately the free-air cutoff frequency of t...	02/23/1988

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