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   Patents 1996 - 2000

 

U.S. Patent No. 5,568,560, 10/22/1996 (app. 05/11/1995) [DjVu104KB]
Audio crossover circuit (class: 381/99; 381/98)
Combest; Christopher E. (assignee Multi Service Corporation)
Abstract: An audio crossover circuit for use with audio speakers is disclosed. The audio crossover circuit includes a pair of inductors that are series connected and inductively coupled and a pair of capacitors. The inductors and capacitors cooperate for achieving a low-pass crossover slope in excess of 30 dB/octave within one half of an octave of the crossover frequency, thereby eliminating the need for additional inductors and capacitors.

U.S. Patent No. 5,663,684, 09/02/97: [ DjVu 288 KB ]
Wafer-stage adjustment for compensating for mismatches in temperature dependent IC components
Herbert, Gary K. (assignee THAT Corp.)
THAT Corporation PR
Abstract: An integrated circuit has at least two components described in the form of two ideally matched transistors, each of which operate interdependently as a function of temperature and at least one physical parameter associated with each of said components when implemented in integrated form. The circuit further includes compensation means, disposed in the integrated circuit, for generating and applying a bipolar compensation signal to at least one of said components so that said two components interdependently operate predictably, consistently and independently of temperature variations and differences between the physical parameter of said two components. The bipolar current is necessary so that both the level and polarity of the compensation signal can be appropriately adjusted during the manufacture of the integrated circuit as a wafer so as to eliminate the need to compensate for any mismatches in the two components following such manufacture.

U.S. Patent No. 5,848,146 , 12/08/1998 (app. 05/10/1996) [DjVu416KB]
Audio system for conferencing/presentation room
Slattery, Ernest Michael (assignee Rane Corporation)
Abstract: A multiport bridge controlled by the intelligence of a programmed microcontroller selectively channels audio from a plurality of input ports to a plurality of output ports including a room program output. Coupled to one of the bridge input ports is at least one gated microphone mixer, including multiple microphone channels and an acoustical echo canceller. Expandability is provided by a second, third or up to n microphone mixers each having a separate echo canceller for the associated group of microphone inputs.

 

U.S. Patent No. 5,937,072, 08/10/1999 (app. 03/03/1997) [DjVu92KB]
Audio crossover circuit (class: 381/99; 381/98)
Combest, Christopher E. (assignee Multi Service Corporation)
Abstract: An audio crossover circuit for use with audio speakers is disclosed. The audio crossover circuit includes a pair of inductors that are series connected and inductively coupled and a pair of capacitors. The inductors and capacitors cooperate for achieving a low-pass crossover slope in excess of 30 dB/octave within one half of an octave of the crossover frequency, thereby eliminating the need for additional inductors and capacitors. The crossover circuit also includes a resistor in series with one of the capacitors for further enhancing the crossover slope beyond an octave above the crossover frequency.

 

 

 

 

 

 

 

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